SEWERAGE in TOKYO 2020

BUREAU OF SEWERAGE TOKYO METROPOLITAN GOVERNMENT

The VR Tours of Tokyo Sewerage System applica- tion uses virtual reality (VR) technology to simulate a visit to Tokyo's sewerage facilities in a 360-degree experience that responds to the viewer's gaze. Sewerage in the Water Cycle 1 The Role of Sewerage in Tokyo We contribute to the water cycle in Tokyo through sewerage system. Sewerage plays vital roles in ensuring a safe and comfortable living environment and creating a good water cycle. We, “Bureau of Sewerage, Tokyo Metropolitan Government (TMG)”, treat wastewater from daily lives or urban activities and return it to rivers and the sea. In addition, we drain stormwater immediately from roads or residential areas. Natural water cycle Improvement of a Living Environment Flood Prevention Dam by Treating Wastewater by Draining Stormwater House, factory, etc. Water source forest We treat wastewater from houses and factories and We protect the city from ﬂooding by draining* ensure a comfortable living environment. stormwater immediately from roads or residential Water purification plant areas. *Drained stormwater is discharged into rivers and the sea or stored in storage facilities. Water cycle in Tokyo Sewer

Wastewater treatment plant

Dischage of effluent

Contents Eﬄuent A drained road 1 The Role of Sewerage in Tokyo …………………………………………………… 2 Sewerage System ………………………………………………………………… 3 Sewerage in the Ward Area …………………………………………………… 4 Sewerage in Tama Area ………………………………………………………… Water Quality Control Our New Role 5 Statistics of Sewerage in Tokyo …………………………………………… in Public Water Bodies Now we play a new role in creating a good urban 6 Management Plan 2016 ……………………………………………………………… We improve and control the water quality of rivers environment. We use resources eﬀectively, for exam- and the sea by treating wastewater and returning it ple, reclaimed water and energy possessed in sewer- 7 Principal Measures for Ward Area ………………………………………… to them. age. We also utilize rooftop spaces of our facilities. 8 Principal Measures for Regional Sewerage System ………………… 22 9 Energy Management and Global Warming Countermeasures …… 23 10 Sewerage Facilities Supporting Our Daily Lives …………………………… 25 11 Expansion of various services………………………………………………… 26 12 Living and Sewerage ………………………………………………………………… 13 Finances …………………………………………………………………………… 14 Organization of Bureau of Sewerage, Tokyo Metropolitan Government… 15 Tracing Back through the History of Sewerage in Tokyo………………

The Photo on the Cover The website of Bureau Higashikojiya Pumping Station of Sewerage Revived Sumida River Shinagawa Season Terrace constructed in the rooftop space SEWERAGE in TOKYO 2020 Higashikojiya Pumping Station receives wastewa- Scan this 2-D code to visit our of Shibaura Water Reclamation Center website. ter from Ota Ward and 5 cities in Tama area such as Musashino City. It has the largest pumping capacity in Japan with a total of 22 pumps and can pump up 100 cubic meters of wastewater per second. It plays an important role of ﬂood prevention by operating pumps day and night. BUREAU OF SEWERAGE TOKYO METROPOLITAN GOVERNMENT

SEWERAGE in TOKYO 2020 Contents ／ 1 The Role of Sewerage in Tokyo 2 Entrance totheSewer 2 Sewerage System ●Combined sewersystem Types ofSewerSystems(CombinedandSeparateSystem) House Drain water is carried to WWTPs, while stormwater is discharged directly into rivers and the sea. the and rivers into directly isdischarged stormwater while WWTPs, to iscarried water waste only domestic/municipal/industrial Then separately. collected are they system, sewer in separate hand, other the On sewer. same in the together WWTPs to carried and collected are stormwater and wastewater domestic/municipal/industrial system, sewer In combined system. sewer separate and system sewer :combined systems sewer of types two are There stormwater. and factories from wastewater industrial munities, com from municipalwastewater houses, from wastewater domestic includes Wastewater municipality. local each In Tama wards area. 23 in the Sewerage) Bureau contact of of please General area, (the administrator Director sewerage the tonotify supposed you are drain, house your renovate or expand If planning you are toestablish, below. in ﬁgures shown as system the of type the on depends system publicsewer tothe method connection The drains. house called are our in customers of residential areas sewers Private collected togetherinthesamesewer Domestic/municipal/industrial wastewaterandstormwaterare Road side side Housing lo matters boundary Public andprivate Rain Gutter (Combined) catch basin Publicly owned t Lateral Factory ＊WWTPs inTokyoarecalled“WaterReclamationCenters”. working properly. them keep to day every maintenance and cleaning inspection, perform We WWTPs treatandcleanwastewater. Pumping stationspumpwastewaterupsothatsewersdonotgettoodeep. Sewers collectandcarrywastewater. sewers, pumpingstationsandwastewatertreatmentplants(WWTPs) Sewerage systemismainlymadeupof3components*: facility Industrial pretreatment metals beforehand. substances suchasheavy facility removesharmful An industrialpretreatment Manhole Private sewer Street gutter L typ the sewerrangesfrom25cmto8.5m. to WWTPs.Theinternaldiameterof Sewers collectandcarrywastewater e

(Domestic wastewater) Catch basin Combined sewer Lateral （ Road catchbasi Stormwater Sewer ） n Manhole （ Road catchbasin Stormwater ■ ■ ■ ） Legend Wastewater Stormwater wastewater Domestic House ●Separate sewersystem Manhole collected separately Domestic/municipal/industrial wastewaterandstormwaterare s side Housing lotH （ (Stormwater) Catch basin Private sewer Rain Gutter Stormwater (Domestic wastewater) Catch basin and flowsnaturallyagain. to nearlygroundlevelatpumpingstations naturally bygravity.Wastewaterispumpedup Sewers slopedowntoletwastewaterflow ） (Domestic wastewater) Catch basin Pumping Station Private sewer catch basin(Stormwater) Publicly ownedinfiltration matters boundary Public andprivate Road sid

(Domestic wastewater) Publicly ownedcatchbasin e Storm sewer （Stormwater） Road catchbasin Lateral Lateral Manhole Domestic sewer Manhole *. - - 3 ComponentsofSewerage Wastewater Treatment Plant(WWTP) Pumping Station Sewer (PVC), clay,The etc. length is approximately approximately is length common materials used common used materials sewer network is network sewer tanks or deeper reaction reaction deeper or tanks treated in our 20 WWTPs in WWTPs our 20 treated from 25cm to 8.5m. to 25cm from To treat a volume large Sewers collect and collect Sewers WWTPs havefacilities WWTPs immediately. sea the and In pumping addition, to ﬂows wastewater in the deep sewers to down slope Sewers settled out. removed, thensandandgritare chamber first.Largeobjectsare Wastewater flowsintothis Grit chamber SEWERAGE in TOKYO 2020 2 Sewerage System

is approximatelyis 5.16 millionday. per cubic meters 16,000km in the 23 wards area. The The area. wards 23 in the 16,000km internal diameter of the sewer ranges ranges sewer the of diameter internal of wastewater, we need extensive sites for WWTPs. We save and utilize spaces effectively by introducing two-layer sedimentation sedimentation introducing by two-layer effectively andutilizespaces save We WWTPs. for sites extensive need we wastewater, of carry wastewater to WWTPs. The The toWWTPs. wastewater carry are concrete, polyvinyl chloride chloride polyvinyl concrete, are stretched around Tokyo total stretched andthe tanks, etc. Inetc. tanks, addition, cooperate we with wards intoand for citizens. parks cities spaces WWTPs turnto of rooftop to treat wastewater and wastewater sludge. treat andtanks to of sludge iswithtreated Wastewater system a is produced.volumeThe wastewater of stations play an important role of flood prevention in case of heavy rainfall by discharging stormwater from sewers to rivers torivers sewers from rainfall stormwater by discharging heavy of in case prevention flood of role important an play stations by way pumping of stations. WWTPs naturally In again. this flows and way, pumping at level up tonearly stations ground is pumped wastewater ground, lay to is difficult it Because ground. in gradually the deeper get sewers naturally Therefore, by gravity. flow wastewater let Rooftop park solids sinktothebottom. through thistankfor2to3hours, As wastewaterflowsslowly sedimentation tank Primary Reaction tank easy tosettle. up, activatedsludgebecomes down. Asmicroorganismsgrow where microorganismsbreakit absorbed toactivatedsludge, Organic matterinwastewateris Epistylis WWTP sludge toanotherWWTPwithtreatmentfacilities. ※If aWWTPdoesnothavesludgetreatmentfacilities,ittransports Sludge isthickened,dewateredandincinerated. Sludge treatmentfacilities sludge. supernatant andthickened and separatedinto Sludge issettledcalmly Thickener Macrobiotus

sedimentation tank Secondary into effluentandsludge. to 4hours,itisseparated slowly throughthistankfor3 in areactiontankflows As activatedsludgeformed .

Philodina dewatered. Thickened sludgeis Dewatering

machine

treated waterfurther. We introducefollowingfacilitiestoclean treatment Advanced wastewater efficiently inthereactiontank. Removes nitrogenandphosphorus A remove completely. the secondarysedimentationtankcannot Removes residualsuspendedsolidsthat Sand filter/Biologicallyactivefilter O process

Chlorination tank facilities Sludge treatment the sea. discharged intoriversand other bacteriabefore to disinfectcoliformsand Treated waterischlorinated Incinerator Discharge incinerated toashes. Dewatered sludgeis Dust collector

Flue gas

Smoke stack treatment tower

3 3 Sewerage in the Ward Area

Sewerage Service in the Ward Area In Japan, cities, towns or villages are responsible for sewerage Overall Plan for Sewerage Systems in the Ward Area service. But in the 23 wards area, we, TMG, provide sewerage Shingashi Water Reclamation Center service on their behalf. Adachi Ward There are 13 WWTPs in 10 treatment districts. The volume of wastewater treated is 4.67 million cubic meters per day. Ukima Water Reclamation Nakagawa treatment area Center Itabashi Ward

Kita Ward Nakagawa Water Reclamation Odai Puriﬁcation Center Sewerage Plan Miyagi Water Center Reclamation Center Planned Population 8,692,000 Shingashi treatment area Kosuge treatment area Kosuge Water Odai treatment Reclamation Center Planned Area 57,839 hectares Nerima Ward Higashi-Ogu area Puriﬁcation Center Katsushika Ward Arakawa Ward

Sewers（March,2020） Mikawashima Water Edogawa river Toshima Ward Mikawashima Reclamation Center Total Length of Sewers 16,136,559 m treatment area Nakano Water Ochiai Water Bunkyo Ward Reclamation Center Reclamation Center Sumida Ward Trunk Sewers 1,114,070 m Taito Ward Suginami Ward Kasai treatment area Branch Sewers 15,022,489 m Nakano Ward Sumida river Kuramae Water Number of Manholes 486,677 Reclamation Center Ochiai treatment area Shinjuku Ward Edogawa Ward Number of Publicly Owned Catch 1,953,493 Shinjuku Subcenter Basin* Water Recycle Chiyoda Ward Sunamachi Center treatment area ＊Except for stormwater catch basins Chuo Ward Koto Ward Arakawa river Shibuya Ward Sunamachi Water Pumping Stations Shibaura treatment area Reclamation Center Number of Pumping Stations 84 Minato Ward (April 1, 2020) Tobu Volume of Pumped Annually 831,923,690 m3 Sludge Plant Kasai Water Reclamation Center 3 Wastewater in FY2019 Daily Average 2,273,016 m Setagaya Ward Meguro Ward ＊Including the Seijo Drainage Control Station Ariake Water Shibaura Water Reclamation Morigasaki treatment area Reclamation Center Center Wastewater Treatment Plants Legend Number of Tokyo Bay Trunk Sewers 13 Wastewater Treatment Plants In service Shinagawa Ward (April 1, 2020) Shibaura treatment area Projected 3 Volume of Treated Annually 1,710,513,110 m Mikawashima treatment area 3 Pumping Stations Wastewater in FY2019 Daily Average 4,673,530 m In service Sunamachi treatment area (including facilities partially operational).

Odai treatment area Tama river Under construction Ota Ward Ochiai treatment area Nanbu Sludge Plant Projected Morigasaki treatment area Wastewater Treatment Plants In service Kosuge treatment area Morigasaki Water Reclamation Center Under construction Kasai treatment area Projected Shingashi treatment area Special Ward boundaries Nakagawa treatment area

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SEWERAGE in TOKYO 2020 3 Sewerage in the Ward Area 4 Sewerage in Tama Area

Sewerage Service in Tama Area Sewerage in Tama Area In Tama area of Western Tokyo, there are some types of sewerage Regional Sewerage Service Public Sewers Connected to Regional Sewerage Service Town A service: regional sewerage service, independent public sewerage Regional sewerage service We construct and manage principal sewerage facilities such service, etc. Sewerage Service for as regional trunk sewers and wastewater treatment plants. Speciﬁc Environmental ＋ City C In regional sewerage service, we, TMG, and local governments (26 Preservation Treatment City E cities, 3 towns and 1 village) cooperate to provide sewerage service. Public sewers connected to regional sewerage service facility Local governments construct and manage sewers from City B We construct and manage regional trunk sewers and wastewater houses to regional trunk sewers. City planning area The Advantage of treatment plants, while local governments are responsible for sewers Treatment facility Regional Sewerage Service City D from houses to regional trunk sewers. Independent public sewerage service Each local government constructs and manages all of ・Water quality of the river, e.g. the middle Independent Public In independent public sewerage system, each local government sewerage facilities. reach of the Tama River, can be integrated. - Sewerage Service ly preserved. Wastewater provides its own service. ・Sewerage service is provided effective- Regional Sewerage service Sewerage service for specific environmental preservation ly due to economies of scale. Treatment Plant The volume of wastewater treated in our 7 WWTPs is 1.02 million ・Construction and maintenance cost Towns and villages construct and manage sewerage can be controlled due to cooperation- cubic meters per day. facilities in non-urbanization promotion areas where among us and local governments.. water environmental preservation is required.

Regional Sewerage System Plan

Planned Population 3,496,000 Overall Plan for Regional Sewerage Services in Tama Area Planned Area 49,069 hectares

Ome Kiyose Water Reclamation Center Pumping Sewers*（March,2020） Station Okutama Town Zanbori Ome City Tamagawa Joryu trunk sewer Total Length of Sewers 232,190 m ga treatment area wa TamagawaHamura Joryu trunk sewer storm trunk sewer Kiyose City Number of Manholes 1,230 Yanase trunk sewer Kurome river Mizuho Town Higashimurayama City Hamura City r Higashiyamato Higashikurume Number of Connection Points trunk se Higashikurume City Demizugawatrunk sewe 344 wer storm to Regional Sewers Hinode Town Arakawa Ugansewer trunk Ochiai river Musashimurayama City karabori river treatment areaKuromegawa storm trunk sewer Ochiaigawa Higashiyamato City storm Kodaira Karabori Joryu storm trunk Nishitokyo City *Managed in part by TMG Karabori Joryu storm 2nd trunk sewer sewer trunk Hiraigawa 1st trunk sewer sewer Yanase trunk sewer Kuro trunk sewer Fussa City Sunagawa storom sewer storm trunk Kodaira me tru Kita-Tama Akiruno City Ki nk sewer Tamagawa Joryu

trunk sewer treatment area Kita-T trunk sewer Kodaira City t Akiruno Akigawa t a trunk sewer hi Pumping Stations and trunk sewer runk sewer Koigakubo Tanas

ama Nigo tr Hinohara Village Akishima City Tachikawa unk trunk sewer Wastewater Treatment Plants* independent sewe Ich Musashino City Tamagawa Joryu Kita- trunk sewer r i area go Tokyo Ward-bound Water Reclamation Koganei City Kokubunji City discharge area T Nogawa Number of Pumping Stations Center Tachikawa City daini turk sewer am 2 Kokubunji Nogawa rive (April 1, 2020) Nishikicho Treatment a trunk sewer treatment area Kita-T Kita-Tama Ichigo Nig Ni K Facility se Higasi trunk sewer Mitaka City ita-T Akigawa Hino trunk s r wer hi trunk Number of Wastewater treatment area Hachioji Kunitachi City o Mitaka 7 Water Reclamation Center ama Hachioji trunk sewer Kita-Tama independent area

se ama Ichigo Treatment Plants (April 1, 2020) Legend Ishikawa w Nigo Water Nogawa er Treatment Facility Mitaka City East trunk sewer Ichigo daiichi trunk sewer 3 Reclamation

Administrative boundaries T Volume of Treated Wastewater Annually 375,122,330 m Center Fuchu City o 3 Asakawa Hachioji Hino City Regional Sewerage service trunk sewers Kita-Tama M in FY2019 Daily Average 1,024,920 m Water Reclamation Ichigo Water ** independent Owada or Center Reclamation Center Nogawa

Regional Sewerage service storm trunk sewers area trunk sewer r i

Kitano gasa Treatment Facility treatment area * Managed by TMG Wastewater Treatment Plant Oguri Inagi Chofu City trunk sewer trunk sewer Asakawa ki Minami-Tama trunk se **Except for Nogawa treatment area Pumping Stations trunk sewer Asakawa treatment area Water Reclamation Chofu W

Tama City ater Hachioji City Center Inagi we Pumping Station r

Inagi City Minami-Tama Komae City R ec runk sewer treatment area l City managed facilities Kotta t amat i

Nogawa treatment area on

Kita-Tama Ichigo treatment area C

Machida City enter Kita-Tama Nigo treatment area Tamagawa Joryu treatment area Minami-Tama treatment area Asakawa treatment area Akigawa treatment area ※ Tsurumi River and Naruse WWTPs in Machida City and Ogochi Arakawa Ugan treatment area WWTP in Okutama Town are independent municipal WWTPs in addition to three WWTPs shown in ﬁgure above. 6 7

SEWERAGE in TOKYO 2020 4 Sewerage in Tama Area 5 Statistics of Sewerage in Tokyo Tama Area Total Population and Percentage of Water Quality of the Tama River and Percentage of Population Served by Sewerage Service Population Served by Sewerage Service

The Ward Area population（thousands）４２４ ■Percentage of population served by sewerage service （mg/L）■Water quality (BOD) 98.6 98.999.2 99.2 99.4 99.4 100 Total Population and Percentage of Water Quality of the Sumida River and Percentage 25 95.3 89.7 Total of Population Served by Sewerage Service population 83.9 Population Served by Sewerage Service Water quality (BOD) ■Percentage of population served by sewerage service 20 75.2 80 population（thousands） 959 ■Water quality (BOD) （mg/L） 100 100 100 100 100 100 100 100 66.9 25 96 100 Total 22.022 88 15 56.8 60 population 81 Percentage of 20 80 population served by 9.4 43.2 71 sewerage service 10 8.5 40 6.6 9.0 6.3 （Environmental 31.6 9.0 15 54 60 quality standard） 7.1 Percentage of 5 20 19.9 2.1 1.7 1.8 2.1 1.3 1.6 population served by 3 3 sewerage service 38 2.3 10 40 2.8 0 （Environmental 8 9.7 0 quality standard） 1965 1970 1975 1980 1985 1990 1995 1999 2003 2008 2018 2019 1971 1975 1979 1983 1987 1991 1995 1999 2003 2007 2 011 2015 2017 2017 2019 （End of the fiscal year）（End of the fiscal year） 7.3 7.1 5 6.5 20 1: Percentage of population served by sewerage service covers Tama area 1: Percentage of population served by sewerage service covers the catchment 5.4 5.6 2.8 2.9 2.7 5.0 2: Total population is taken from statistics of Bureau of General Affairs area of the Tama River

4.1 3.9 3.4 2: Water quality is the annual BOD value (BOD 75 percentile value) at the Tamagawarabashi Bridge (Based on data served by Bureau of Environment) 0 0 1965 1970 1975 1980 1985 1990 1995 1999 2003 2008 2018 2019（End of the fiscal year） 1971 1975 1979 1983 1987 1991 1995 1999 2003 2007 2 011 2015 2017 2018 （End of the fiscal year） 1: Percentage of population served by sewerage service covers the ward area 1: Percentage of population served by sewerage service covers the catchment Percentage of Population Served by Sewerage Service for Individual Cities 2: Total population is taken from statistics of Bureau of General Affairs area of the Sumida River (Itabashi, Kita, Nerima ward) （％） 3: Percentage over 99.5% is considered as 100% 2: Water quality is the annual BOD value (BOD 75 percentile value) at the Odaihashi Bridge (Based on data served by Bureau of Environment) Higashi Hachioji Tachikawa Musashino Mitaka Ome Fuchu Akishima Chofu Machida Koganei Kodaira Hino murayama Kokubunji Kunitachi Fussa Percentage of population served by sewerage service 99 100 100 100 98 100 ※100 100 99 100 100 96 100 ※100 100 100 March of 2020 Average Water Quality of Wastewater Treatment Plants Percentage of population served by sewerage service 99 100 100 100 98 100 ※100 100 99 100 100 96 100 ※100 100 100 （Unit：㎎／L） March of 2019 Parameter Influent Effluent Effluent quality standards Komae Higashi Kiyose Higashi Musashi Tama Inagi Hamura Akiruno Nishitokyo Mizuho Hinode Hinohara Okutama Total yamato kurume murayama BOD 158 6 25 Percentage of population served （Results in FY2019） by sewerage service 100 ※100 ※100 100 ※100 ※100 99 ※100 94 ※100 98 ※100 91 91 99 Average of 13 wastewater treatment plants. March of 2020 COD 85 9 35（15） Percentage of population served Values in brackets are effluent quality standards for wastewater by sewerage service 100 ※100 ※100 100 ※100 ※100 99 ※100 94 ※100 98 ※100 89 91 99 Total nitrogen 32.0 11.7 30（20） treatment plants equipped with advanced wastewater treatment. March of 2019

*BOD and COD are indicators of water pollution (organic matter). 1: Percentage over 99.5% is considered as 100% Total phosphorus 3.5 1.0 3.0 Average Water Quality of Wastewater Treatment Plants Statistics of Wastewater and Sludge Treatment(Ward Area) （Unit：mg/L）（Results in FY2019） Parameter Influent Effluent Effluent quality standards Wastewater volume（㎥） Sludge volume（㎥） Dewatered sludge weight（t） Incinerated sludge weight（t） Results BOD 170 3 25 WWTP etc. Annual Dairy average Annual Dairy average Annual Dairy average Annual Dairy average COD 100 8－ Total nitrogen 32 8.4 30 （Results in FY2019） Shibaura 227,718,510 622,180 Transported to Nanbu Sludge Plant(via Morigasaki) Average of 7 wastewater treatment plants Total phosphorus 3.6 0.8 3.0 *BOD and COD are indicators of water pollution Mikawashima 161,955,590 442,500 Transported to Sunamachi (organic matter). Sunamachi 137,054,710 374,470 5,285,740 14,442 Transported to Tobu Sludge Plant Statistics of Wastewater and Sludge Treatment (Tama Area) Tobu sludge plant －－ 13,256,115 36,220 250,623 685 212,344 580 （Results in FY2019） Ariake 4,706,080 12,860 Transported to Sunamachi Results Wastewater volume（㎥） Sludge volume（㎥） Dewatered sludge weight（t） Incinerated sludge weight（t） Nakagawa 71,894,410 196,430 Transported to Kasai(via Kosuge) WWTPs etc. Annual Dairy average Annual Dairy average Annual Dairy average Annual Dairy average Kosuge 82,607,840 225,700 Transported to Kasai Nogawa treatment area 85,501,760 233,610 Treated at Morigasaki water reclamation center in the ward area Kasai 122,276,640 334,090 11,921,060 32,570 162,861 445 162,861 445 Kita-Tama Ichigo 75,848,770 207,240 2,860,860 7,820 48,134 132 48,332 132 Ochiai 115,965,100 316,840 Transported to Sunamachi(via Miyagi and Mikawashima) Kita-Tama Nigo 20,372,460 55,660 529,200 1,450 12,410 34 12,896 35 Nakano 21,115,910 57,690 Transported to Sunamachi(via Ochiai, Miyagi and Mikawashima) Tamagawa Joryu 65,126,140 177,940 1,960,060 5,350 56,101 153 56,739 155 Miyagi 70,382,190 192,300 2,290,510 6,260 38,025 104 38,025 104 Minami-Tama 42,904,640 117,230 1,965,710 5,370 30,379 83 30,677 84 Ukima 55,256,170 150,970 Transported to Shingashi Asakawa 31,151,000 85,110 428,990 1,170 23,928 65 21,498 59 Shingashi 199,436,880 544,910 6,882,070 18,803 123,670 338 123,670 338 Hachioji 51,687,640 141,220 1,749,780 4,780 30,737 84 31,546 86 Morigasaki 440,143,080 1,202,580 6,366,250 17,390 Transported to Nanbu Sludge Plant Kiyose 88,031,680 240,520 2,491,440 6,810 62,925 172 62,925 172 Nanbu sludge plant －－ 15,221,890 41,590 391,380 1,069 391,380 1,069 Regional subtotal 375,122,330 1,024,920 11,986,040 32,750 264,614 723 264,614 723 Total 1,710,513,110 4,673,520 61,223,635 167,275 966,559 2,641 928,280 2,536

1: Incinerated sludge weight of Tobu Sludge Plant does not include the weight processed by the carbonization furnace. Total 460,624,090 1,258,530 11,986,040 32,750 264,614 723 264,614 723 2: A part of Miyagi sludge is transported to Sunamachi. 1: Incinerated sludge weight includes the weight of recycled sludge. 2: Wastewater from Nogawa treatment district is treated at Morigasaki water reclamation center in the ward area.

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SEWERAGE in TOKYO 2020 5 Statistics of Sewerage in Tokyo Ward Area

6 Management Plan 2016 7 Principal Measures for the Ward Area

In addition to the basic role of sewerage, the Bureau of Sewerage in Tokyo has been required to solve new problems due to changes in the social situation etc. in recent years. Measures Reconstruction of Facilities In addition to initiatives addressing rapidly ageing sewerage facilities, recent years’ increasingly frequent local torrential rains, and the Sewage works in ward area began during the Meiji era and sewage coverage ratio reached approximately 100% in Tokyo near-field earthquake anticipated to hit in the future, there is also a need to work on improving water quality in Tokyo Bay, rivers, FY1994. However, facilities constructed during the early years are deteriorated. and the ocean.Furthermore, issues to be addressed by Tokyo Sewerage are diverse, including reduction of energy consumption in We will extend the life of the facilites, implement countermeasures against aging, and systematically promote recon- sewage treatment process and reduction of greenhouse gas emissions that has to be promoted on a global scale. structing to efficiently enhance stormwater drainage capacity and earthquake resistance to provide stable sewerage Based on these circumstances, in order to enhance service quality, we formulated “Tokyo Metropolitan Government services to the customers in the future. Sewerage Operations Management Plan 2016” for five fiscal years from 2016 to 2020, with an eye towards the Tokyo 2020 Olympics and Paralympic Games and the further ahead of them. In the plan, 3 points below are set as Reconstruction of Sewers management policies. Cameras and other equipment are being used to carry out surveys of sewerage pipe conditions. When damaged section is found, it is repaired/ strengthened from inside by rehabilitation methods.

Management Policy Rehabilitation methods Policy 1: Ensure the safe and comfortable living environment Reconstruction of branch sewers Sewers before reconstruction We will protect the safety of citizens life and support a safe and comfortable living environment by enhancing (Area wide rehabilitation or replace- Replacement取付管の取替えof lateral sewerage functions to deal with localized heavy rains and to withstand a possible massive earthquake, in order ment of deteriorated branch sewers) (Replacement with rigid PVC pipe) to steadily realize the basic roles of Sewerage ̶improvements to the living environment through sanitary sewage ※See also P18, Enhancement of treatment, protection from ﬂooding through stormwater abatement, and conserving the water quality of public water Operation and Maintenance bodies̶into the future.

Policy 2: Contribute to improving the water environment and creating an environmentally friendly city The deterioration in concrete surface In order to succeed the good water environment to the next generation, we are committed to work on improving the water quality and corrosion of reinforcing steel is lowering the strength of sewers. of the sea and rivers and to promote the reduction of energy consumption and greenhouse gas emissions, thereby to contribute to the realization of the world's most environmentally friendly city.

Policy 3: Consistently provide the best service at the lowest cost Sewers under reconstruction works We will maximize our fundamental responsibility as a public enterprise to provide stable service at the lowest cost into the future by strengthening our management base through continually working to improve management efﬁciencies and enhancing service quality.

Plan Overview

Reconstruction幹線の再構築 of trunk sewers Sewers are strengthened by lining them (Aging trunk sewers and trunk sewers that need to be ﬁxed Switch to alternate代替幹 trunk線の整 sew備ers with rigid polyvinyl chloride material. Ensure the safe and Contribute to improving the based on in-pipe surveys) This enables low-cost renewal since roads (Alternate trunk sewers for switching the ﬂow of trunk sewers comfortable living water environment and creating with high water level) do not have to be digged up. environment an environmentally friendly city

Improvement of Reconstruction of Sewers Reconstruction of Facilities Combined Sewer System

Advanced Treatment Our efforts Reconstruction of branch sewers Flood Control •Total length of sewers in the Tokyo 23-ward areas extends up to 16,000 km, of which sewers exceeding the legal service life (50 years) already amount to 1,800 km and will increase to 8,900 km in the next 20 years. Therefore, we will utilize Energy Management and Global asset management method to extend the service life for additional 30 years and reconstruct them efﬁciently in econom- Countermeasures for Warming Countermeasures ic service life (about 80 years). Earthquake Disaster Enhancement of Operation and Maintenance ・To achieve leveling of business in mid- to long-term, we will divide the period into 3 phases according to the construction age of the Tokyo 23-ward areas. We prioritize the reconstruction of 4 old urban central treatment area (the ﬁrst phase reconstruction area) and complete it by FY2029.

※Asset management method: This is the method that systematically and efﬁciently manage assets while evaluating the state of the Consistently provide the best service at the lowest cost facilities, conducting appropriate maintenance, and considering the life cycle cost and the leveling of reconstruction business in mid- to long-term. ※Economic service life: This is the number of years in which the annual average cost, computed by total cost (same as life cycle cost, construction cost plus maintenance cost) divided by the elapsed years, is the smallest.

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SEWERAGE in TOKYO 2020 6 Management Plan 2016 ／ 7 Principal Measures for Ward Area Ward Ward Area Area Phase III 32 years Area Approx.12,200ha Extensions Approx.4,300km Measures Flood control

Whole the 23 wards 37 years Promoting flood control will ensure urban functions that make Tokyo a safe and sound place for our customers. Based on Area Approx.56,200ha Adachi Ward 䠖 “Tokyo Metropolitan Government Basic Policies for Storm Rainfall Counter-measure (Revision)”, we will develop facilities Extensions Approx. 16,000km Itabashi Ward that can respond to rainfalls exceeding 50 mm per hour. In large-scale underground malls and districts where extensive Kita Ward Nerima Ward Arakawa Ward Katsushika Ward damage has occurred, we will promote the development of facilities that have upgraded maintenance standards. Toshima Ward Nakano Ward Bunkyo Ward Sumida Ward Shinjuku Ward Taito Ward Suginami Ward Edogawa Ward •For rainfall of 50 millimeters per hour, countermeasures are taken in high flood-risk Countermeasure Promotion Areas, Chiyoda Ward catchments with shallow underground trunk sewers, and other priority areas. Chuo Ward Koto Ward Shibuya Ward •For rainfall of 75 millimeters per hour, facilities for handling such rainfall will be constructed for large underground Minato Ward Setagaya Ward shopping centers massively impacted by flood- Phase II 41 years Meguro Ward ing and Urban Countermeasure Areas experienc- Area Approx.27,700ha Stormwater infiltration Shinagawa Ward equipment Extensions Approx. 7,200km In housing lot ing particular heavy damage. Ota Ward Concepts of flood control Phase I 63 years •In 50-Millimeter Expanded Countermeasure Areas, *Numbers in brackets indicate average elapsed years Four central treatment districts at the end of FY2019. However, 63 years, which is the facilities will be constructed to handle rainfall average elapsed years of the first phase reconstruction Area Approx.16,300ha Extensions Approx. 4,500km exceeding 50 millimeters. area, is the average elapsed years f or pipes that reconstruction Constructing stormwater has not been finished yet. reservoir for flood control Storage of stormwater exceeding Reconstruction area and average elapsed years the capacity of sewers ●Example of efforts in a promotion area for flood control“Nishi-Nip- Bypass pipes s Existin pori System Pump Building, Higashi-Ogu Water Purification Plant” Existing main g trunk s branch sewer Maintenance/extensions of sewer pipes by fiscal year (km) Supplemen ewers 600 Reconstruction tary pipes by FY2029 Constructing temporary Safety at large-scale storage pipes underground malls approximately of 80 years of Leveling of approximately half 500 the average elapsed years Temporary holding stormwater Response to rainfall at time of completion of peak in construction period exceeding sewerage pipe capacity 75mm per hour

400 Phase III Pumping station 300 Increase of pumping station capacity constructing new pumping stations 200 Increasing number of pumps Constructing trunk sewers Reconstruction completed and introducing standby operation pumps for ﬂood control ●Information about Our Large-Scale Projects in first phase area Reinforcing stormwater drainage capacity Read the 2-D code for information on Bureau Phase II Reconstruction Reconstruction by establishing new trunk sewers of Sewerage flood control projects to protect 100 Reconstructio Phase I Tokyo from torrential rains.

0 T1 T14 S13 S26 S39 S52 H2 H15 H28 H41 H54 H67 H80 H93 FY1925 FY 1945 FY 1955 FY 1965 FY 1975 FY 1994 FY 2019 FY 2029 Image of maintenance of facilities that can respond to 50 mm per hour rainfalls (promotion areas and priority areas) Sewage Coverage Ratio rate reached approximately 100% (FY 1994) Start of reconstruction (FY1995)

Spreading sewerage Reconstruction after approximately 80 years of economic service life Image of flooding in the area where measures are implemented Image of asset management of sewersewer Occurrence of flooding Image of countermeasures of facilities construction to respond to 50 mm per hour rainfalls The water level in the trunk Lowering of water level sewer rises, which causes Our efforts Reconstruction of trunk sewers flooding damages at depressing, foot of a slope, •Trunk sewers are pipelines that constitute a framework of the sewer network and collect a large amount of sewage to Existing sewers and other areas. make it flow down to wastewater treatment plants and pumping stations. We will promote reconstruction by utilizing Shallowly buried trunk sewers Image of flooding in priority areas (basins of shallowly buried trunk sewers) rehabilitation method to reinforce sewers from inside without digging up roads. Trunk sewers as a countermeasure for Stormwater flows backward rainfall 50 mm per hour ・We will promote reconstruction by prioritizing work on 47 trunk sewers constructed ●Information about Our due to the rise in water level of the trunk sewer, which Eliminated flooding damage caused by 50 mm before 1955 and trunk sewers that need to be fixed based on in-pipe survey. Large-Scale Projects causes flooding damages at per hour rainfalls by developing new trunk sewer and decreasing the water level in the ・For trunk sewers that are difficult to reconstruct due to high water level or other rea- Read the 2-D code Shallowly buried trunk sewers lowland. trunk sewer. sons, we will develop alternate trunk sewers in advance which are necessary to change for information on improvements to the the flow of sewage. Chiyoda Trunk Sewer. Image of maintenance at urban districts Image of maintenance at districts that measures (which can respond to 75 mm per hour rainfalls) against 50 mm per hour rainfalls are expanded Our efforts Reconstruction of Wastewater Treatment Plant and Pumping Stations

•We will secure functions that stably treat sewage and eliminate stomewater in the future by reconstructing aging waste- Planned rainfall over 75mm per hour Rainfall over 50mm per hour water treatment plants and pumping stations.

・We will implement countermeasures against aging, enhance stormwater drainage capacity and earthquake resistance, and Existing systematically promote reconstructing to efﬁciently sophisticate energy utilization and reduce greenhouse gas emissions. Existing sewers detention ・We will extend life of the facilities as much as possible by repairing and preventing corrosion based on periodic inspections tank and surveys and reconstructs them sequentially from facilities that require improvement. Existing sewers ・We will utilize asset management method, double approximately the legal service life of the facilities by systematic repair, and reconstruct them efﬁciently in economic service life. Responding rainfall Responding rainfall 75mm per hour by Trunk sewers as a countermeasure 50mm per hour by for rainfall 50mm per hour Enhanced trunk sewer existing sewers and existing sewers and new trunk sewers as Existing detention tank will be utilized new trunk sewers as a countermeasure a countermeasure for rainfall over 50mm per hour 12 13

SEWERAGE in TOKYO 2020 7 Principal Measures for Ward Area Ward Ward Area Area Before After Measures Countermeasures for earthquake disaster We will secure sewer functions and trafﬁc functions including emergency routes by promoting counter-measures

against Tokyo Inland Earthquake and tsunami. Inside wall of a manhole Rising of water pr Pressure control pick

Water Water Our efforts Earthquake-prooﬁng of junction between sewers and manholes pressure pressure essur • We have completed countermeasures for sewers that receive wastewater from facilities such as evacuation sites and Valve Wire net e disaster base hospitals and are currently promoting earthquake resistance of facilities by expanding our scope to Manhole wall disaster restoration sites, newly designated evacuation sites, important facilities for disaster prevention, etc. Liquefaction Liquefaction

Installing rubber blocks ・As there is a risk of damage of floating manholes Our efforts Countermeasures to restrain manhole from floating absorbing the earthquake due to liquefaction, we are taking measures to tremor. •At areas with a high risk of liquefaction, countermeasures such as emergency routs have completed by now. At the ensure traffic function. moment, we are promoting countermeasures for expanded target such as routes which connect evacuation sites and ・As there is a risk of damage to the connection of ・Suppress uplifting of manholes by dissipating emergency routes and remaining areas in the target areas. sewer pipe and manhole caused by earthquake, excess water pressure caused by liquefaction. we are carrying out earthquake resistance to Case study of floating of sewage manhole ensure sewer function. (Great East Japan Earthquake・ Urayasu City, 2011) 【Earthquake-proofing of the joints using 【Manholes surfacing suppression ・Securing toilet functions at evacuation sites, terminal stations, and so on. ・Securing the transportation system of routes which connect evacuation sites and emergency routes. elastic sealant between manholes and sewers】 countermeasure】・Ensuring toilet and transport functions in stayed-in district residual areas. Our efforts Earthquake-proofing countermeasures of wastewater treatment plants and pumping station

・We will implement earthquake-prooﬁng countermeasures to maintain the functions that should be ensured after the disaster, against assumed maximum earthquake ground motion possible.

Pumping function Disinfection functions ※ Major terminal stations District Residual areas Emergency routes, etc Grit Chamber/Pumping facility Primary treatment functions Chlorination Tank Primary Sedimentation Tank Sluge Treatment

Evacuation sites

Reaction Tank Public inlet Disaster base hospital Evacuation sites Secondary Sedimentation Tank Road linking target facility and Flexible joint emergency transportation road Lateral Emergency routes, etc ※Red text: Facilities at which earthquake-resistance will be implemented Wastewater Treatment Plant

Our efforts Securement of self-power supply in case of emergency

Manholes surfacing Earthquake-proofing of the joints ・We will install emergency power generation suppression counter- using elastic sealant between equipment and ensure stable supplies of fuel measure manholes and sewers Wastewater Treatment Plant required for operation to secure power supply in case of emergency including power outage. Earthquake-prooﬁng of sewers

※District Residual areas: Areas where people do not need to evacuate to wide-area evacuation sites because the area has been structured to have little risk of large-scale ﬁres spreading after a disaster.

Gas turbine generator（13,000kVA）

14 15

SEWERAGE in TOKYO 2020 7 Principal Measures for Ward Area Ward Ward Area Area

Measures Improvement of Combined Sewer System Measures Advanced Treatment ・In a combined sewer system in which wastewater and rainwater are flowed in the same single sewer pipe, the whole ・To reduce the occurrence frequency of red tide in Tokyo Bay, it is necessary to remove nitrogen and phosphorus in amount of sewage is collected and treated in the wastewater treatment plants on sunny and weak rainy days, while in effluent further, which are among the factors of red tide. case of strong rain, rainwater mixed with wastewater is discharged from the discharge outlets along rivers or from ・To improve water quality of effluent further and earlier, we introduce semi-advanced treatment method and newly-devel- pumping stations to rivers and the sea, etc. in order to protect urban area from flood. oped advanced treatment method (anaerobic and simultaneous nitrification-denitrification treatment method), both of ・Storage facilities and other infrastructure will be constructed to improve water quality in rivers and oceans. which can remove more nitrogen and phosphorus than conventional treatment method, by renovating existing facilities.

Comparison of treatment methods ・In order to reduce the amount of pollution released into water body from combined sewers in rainy weather, The ・Semi-advanced treatment method can slightly improve water quality Bureau is constructing storage facilities to hold the initial stormwater (which is particularly dirty). Accumulated Conventional activated sludge method Water Electricity Removal of (mainly) organic matter Effluent sewage will be delivered to the wastewater treatment plants for treatment after the rain stops. guality consumption without increasing power ・For wastewater treatment plants, we will install high-speed filtering facilities capable of removing double of the Influent Nitrogen：1 00 consumption compared to conven- Blower amount of contaminants compared with conventioral facilities by quick improvements to existing sedi-mentation Phosphorus：1 00 tional treatment method. ・Newly-developed advanced treat-

facilities. facilities renovating existing Early introduction by ● Semi-advanced treatment ment method can achieve both Information about Our Large- Phosphorus removal Removal of organic matter and nitrogen Efﬂuent Installation of stormwater Scale Projects Nitrogen：8 5 water quality improvement and Inﬂuent Stormwater infiltration inlets facility Read the 2-D code for infor- Blower Phosphorus：5 0 energy saving. We introduce it if (residential) infiltration inlet mation on improvements to the Chiyoda Trunk Sewer. Few oxygenic condition further water quality improvement

Reducing the incoming volume of water into sewers facility reconstruction Introduction with Advanced treatment Removal of nitrogen Delivery of nitrified water is required and it matches facility by infiltrating stormwater in residential districts Phosphorus removal Effluent Removal of organic matter and nitrogen conditions. Nitrogen：6 5 ・For facilities where newly-devel- Reducing the amount of sewage discharged Influent Phosphorus：4 0 Sanitary sewage Storage sewer construction from sewer outlets in rainy weather Blower oped advanced treatment cannot Anaerobic condition Anoxic condition Stormwater be introduced, we will develop conditions are matched existing facilities if Early introduction at New type of advanced treatment (anaerobic and simultaneous nitrification-denitrification treatment method) Phosphorus removal Removal of organic matter and nitrogen Effluent new technologies. Pumping Station Nitrogen：6 5 Sewer outlet Under 100 Influent Phosphorus：4 0 Blower

Anaerobic condition Anoxic condition

Measures Enhancement of the efficiency and reliability of sludge treatment ・We will secure the function that can stably treat sewage for the future by appropriately treating and disposing sludge Strage tank construction which is generated when sewage is treated. Reducing of amount of sewage discharged from pumping stations during torms ・We will multiply sludge transmission route and promote the development of facilities that can mutual- Measures for stormwater outlets High-speed filtering ly send sludge between wastewater treatment plants to improve reliability of sludge treatment. Reduction of discharges of debris and oil ball Wastewater Treatment Plant facilities construction※ ・We will develop sludge treatment key station※, improve sludge treatment efficiency, and secure backup function. Intercepting sewer construction Legend Slude treatment Key station Incinerator The number of incinerators operated can Increase of the total volume of sewage conveyed （Initial status） to waterwastewater reclamation treatment centers plants during during rainfalls rainfalls Incinerator be reduced by appropriately distributing the 70 100 （After implementing countermeasures） amount of sludge transportation among the Strage tank construction Installation of Efficient operation (100) wastewater treatment plant and the sludge treatment key station. Reducing the amount of sewage discharge at Water treatment facility oil fences （Slude treatment 10）（Slude treatment 20） wastewater treatment plants during rainfalls Reduction of discharges of debris and oil ball ※Sludge treatment key station：A sludge treatment WWTP A WWTP B facility that adjusts the amount of sludge between the wastewater treatment plants and is responsible Improvement of Combined Sewer System 100 10 100 100 20 100 for efficient operation in normal conditions and Incoming sewerage Reduction Reduction backup function in emergency. duringin rainy a weather storm Primary sedimentation tank High-speed filtering facilities Reaction tank Secondary Effect of developing sludge treatment key station (image of streamlining) sedimentation tank mprRemodellingovements to Disinfection/ primary sedimentation Water discharge tank facilities ・We will extend the life of the landfill disposal site by reducing sludge with whole incineration and recycling it to cement raw materials. Image of high-speed filtering facility treatment Rivers ・We will expand the use of concrete secondary Water products such as reinforced concrete pipes and discharge assembled manholes that effectively utilize Filter media RemovalRemoving of of Incoming contaminantspollutant by particle-size adjusted ash to public works of sewerage byfilter filter media media during a storm Tokyo Metropolitan Goverment. Recycling of sewage sludge Release from the outlet of combined Storage facility(Shibaura Water Image of developing high-speed filtration facility by 16 sewer system in rainy weather Reclamation Center) remodeling settlement facility (Particle-size adjusted ash) 17

SEWERAGE in TOKYO 2020 7 Principal Measures for Ward Area Ward Ward Regional Area

Measures Enhancement of Opreration and Maintenance 8 Principal Measures for Regional Sewerage System In order to secure stable sewerage functions for the future, we will implement operation and maintainmance for sewers, wastewater treatment plants and other fascilities approiately.pr Measures Reconstruction of trunk sewers and wastewater treatment plants Together with measures against aging of facilities, we will systematically promote restructuring of facilities to improve Our efforts Operation and maintenance of earthquake resistance, advance energy utilization and reduce greenhouse gas emissions efﬁciently. sewers Utilizing the asset management method, we will reconstruct facilities efﬁciently within their economic useful life, and as for Maintenance work focused on preventative measures will be reconstructing of trunk sewers, those requiring countermeasures will be prioritized based on the trunk sewer survey. conducted, including regular sewer pipe inspections and the systematic replacement of damaged house connections, which account for approximately 70% of street collapses caused by sewer- Before reconstruction age facilities.

Aggregate is exposed After reconstruction

Aging trunk sewer in which water level is high Reconstruction to an energy-saving dehydrator (photo of Kotta trunk sewer taken from inside of a manhole) (Kiyose Water Reclamation Center) （Left: Damaged vitriﬁed clay pipe Right: House connections replaced （Sewer pipe inspection conducted using with hard vinyl chloride pipes） mirror cameras） Measures Countermeasures for earthquake disaster Our efforts Water Quality Improvement Our efforts Enhancement of operation and In order to maintain the functions that should be ensured even after an earthquake with the largest assumable earthquake and Energy Saving maintenance of the wastewater motion, we will complete our earthquake-resistant countermeasures to ensure minimum necessary facility capacity by- treatment plant and pumping station FY2019. Further, we will maintain emergency power generation facilities and keep enough fuel needed for operation to secure We optimize operation conditions at each WWTP by utilizing transmission facilities and develop a electricity in case of emergency including power outage. two indicators : efﬂuent water quality and power consumption. We will utilize mutual sludge responses to crisis management for We call this method “Two Axes Management Method”. backup system to strengthen We aim to achieve both contribution to a good water sections with no multiple sludge pipelines. environment by improving water quality and energy saving by reducing power consumption.

Shingashi Ukima Kosuge Previous water reclamation water reclamation water reclamation

Nitrogen concentration center ﬁscal year center center This ﬁscal year

・An example of decreasing Ochiai Miyagi air flow supply to prioritize water reclamation water reclamation reduction of power consump- center center tion ・In the following fiscal year, we Be施工fore前 During will aim to improve water quality under the condition of reduced power consumption. Example of earthquake-proofing of facility Mikawashima (adding concrete（M) inamitama Water Reclamation Center） water reclamation center ：Usual sludge ・An example of achieving both transmission route improvement of water quality ：B ackup sludge and reduction of power consump- transmission route Under maintenance tion by renovating facilities or ：wastewater treatment controlling operation conditions . plants and other Tobu Kasai ・In the following fiscal year, we will facilities that are さらなる sludge plant water reclamation aim for higher goals by optimizing treating sludg center operation conditions further.

Example of backup of sludge treatment (in case sludge Objectives and Directions cannot be sent from Mikawashima Water Reclamation Water quality improvement and reduction Aeration energy consumption, etc of power consumption Center to the Tobu Sludge Plant).

NaS batteries Emergency power generator (Asakawa Water Reclamation Center) （Kita-Tama Ichigo Water Reclamation Center） 18 19

SEWERAGE in TOKYO 2020 7 Principal Measures for Ward Area ／ 8 Principal Measures for Regional Sewerage System Regional

施Measures Countermeasures against stormwater Measures Enhancement of operation and Maintenance Management In areas where wide-area stormwater drainage is required, we will implement river basin storm trunk sewers. In We will extend the life of sewer trunk sewers and facilities by conducting preventative maintenance such as scheduled addition, we will create flood inundation area maps for the realization of safe and secure life. repair. Also, we will reduce electricity, fuel use, and maintenance expenses, though the introduction of energy efficient equipments and the improvement of operation and maintenance. In adition to that, we will deal with operational management which aims at achiving both of water quality improvement and energy use reduction. Furthermore, we will make efforts to efficiently manage the operation by utilizing the mutual exchange function of Implementation of the river basin storm trunk sewer Creation of flood inundation area maps utility tunnels.

0.1～0.5m

0.5～1.0m

1.0～2.0m

B city 2.0～3.0m Utility tunnels that cross the Tama River Cross section of a utility tunnel between the WWTPs (inner diameter 3.5 m)

A city C city treatment area Ta mag Optical ﬁber cable and Segment Musashimurayama City aw

treatment area Kita- other management cable treatment are Kita- a Joryu Reclaimed wastewater Fussa City T T ama Nig ama Nig Image of stormwater countermeasures Tamagawa Joryu Storm Trunk Sewer Akishima City Sludge pipe Kita-tama Ichigo / Nigo Treatment District Kita-Tama Nigo Water Reclamation Center by the river basin storm trunk sewers （The entire line started its operation in FY2004） Tamagawa Joryu Water Reclamation Center a o o Kokubunji City Koganei City Kita- Kita- treatment area Flood Forecast Area Map treatment area Sanitary sewer Tachikawa City Nog Sanitary sewer Ta Akigawa Kunitachi City Ta aw a ma Ichig treatment area ma Ichig Fuchu City Ni Hachioji Water Reclamation Center 〇As a regional storm sewer project, the implementation of five 〇For the Kita-tama Ichigo / Nigo Treat- Kita-Tama Ichigo Water Reclamation Center Hino City o ment District and the Upper Tama River o Nogawa storm trunk sewers, including Tamagawa Joryu Storm Trunk treatment area Trunk Sewer Catchment, a flood forecast Asakawa Water Reclamation Center Chofu City Sewer, and Kuromegawa Storm Trunk Sewer, has been completed. area map has been released that con- Asakawa treatment area Tama City 〇In the southern portion of the Upper Karabori River Catch- tains forecasts for the maximum predict- Minami-Tama Minami-Tama Water Reclamation Center treatment area Inagi City ment, it has been decided that initiatives will be implemented able level of rainfall. This map will be used for flood prevention measures in as a prefectural sewerage project. cities across the region in the future.

Measures Advanced Treatment To create an water environment preferred by Ayu (sweetfish) the symbolic fish of the Tama River, and other aquatic life Image of the improvement of sludge treatment efficiency utilizing utility tunnel Example of high-temperature energy-saving type incinerator we will promote advanced treatment through introducing both a semi-advanced treatment method that enables quick- er installation by remodeling existing facilities, and a new advanced treatment (anaerobic and simultaneous nitrification-denitrification treatment method) that improves water quality drastically compared with a conventional treatment method.

In the Tama River, treated wastewater constitutes half of the quantity of river water Proportion of advanced treatment facilities r 80％ er (turbocharger) 水南水北再多再多生摩生摩 70％セ一 e セ八水北ンン号 Kita-Tama Ichigo Water Reclamation Center Treated water 多王浅再多タタ 60％摩子 River water 川生摩 Minami-Tama Water Reclamation Center 川水水セ二 50％上再再ン号流生生タ水セセ 40％再ン Kita-Tama Nigo Water Reclamation Cente r

ン Intake as agricultural water and industrial wate Intake as a tap water sourc 生タタ Asakawa Water Reclamation Center セ 30％ン浅タ川 Hachioji Water Reclamation Center Asakawa River r Tamagawa Joryu Water Reclamation Center 20％ Nogawa River/ Senkawa Rive r 二 10％ Inefﬁcient operation of Improving incineration incinerator in which the amount efﬁciency and reducing auxiliary 0％ 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 of sludge is not appropriate for fuel use by allocating treatment

Amount of river water in the Tama River Sludge gasiﬁcation incinerator, Tamagawara Brige Nikaryo-Kamigawara Wei Ozaku Intake weir

Hamura Intake weir the incineration capacity amount appropriately Proportion of advanced treatment facilities *Until 2011, quasi-advanced treatment Minami-Tama Water Reclamation Center Upstream area Middle basin Tokyo Bay was not included to the proportion of Proportion of facility capacity of advanced treatment as it was on trial. quasi-advanced treatment facility and ※Based on data provided by Ministry of Land, Infrastructure, Transport and Tourism, Kanto Regional Development Bureau, Keihin office. advanced water facility Utilizing mutual flexibility function of utility tunnels to We will thoroughly prioritize efficient incinerators such stabilize discharged water quality and improve efficiency as high-temperature energy-saving type incinerators and At the Tama River and the Yanase River, treat- of sludge treatment. will reduce auxiliary fuel use and greenhouse gas ed wastewater constitutes 50 to 60% of the emissions. quantities of water of rivers and the role of sewerage is important to create good water environment. In 2019, about 3.33 millions of sweet- Sweetfish running the Tama River fish run the Tama River. (Collection of Tokyo Metropolitan Islands Area Research and Development Center for Agriculture, Forestry and Fisheries)

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SEWERAGE in TOKYO 2020 8 Principal Measures for Regional Sewerage System Regional

Measures Strengthening cooperation with municipalities 9 Energy Management and Global Warming Countermeasures In addition to building a wide-area operations and maintenance system, we will strengthen our technical support to municipalities in order to apply our knowhow of operations and maintenance work, etc.to sewerage works management in the Tama District. Additionally, we will build a mutual support system and strengthen coordination with municipali- Measures Promotion of “Smart Plan 2014” and “Earth Plan 2017” ties to secure sewerage functions in the event of a disaster. We will actively promote the reduction of energy consumption and greenhouse gas emissions based on “Smart Plan 2014” and “Earth Plan 2017.” Sewweerraagge information exchange meetingm

SewSewer businessbusiness management Measures Smart Plan 2014 (Basic Energy Plan for Sewerage Operations) Agingging countermeasurescountermeasures CrisisCrisis managemeementnt

Human resourceresource We aim to achieve the ratio of above 20% of renewable energy and energy saving in total to the total Operperation and Maintenance devdevelopmentelopment Target amount of energy usage by FY2024. Sewerage information exchange Sending in/taking in night soil Information exchange meeting among the 30 municipalities in a disaster of Tama (Scene of a field tour) （Kita-Tama Nigo Water Thehe 30 municipalitiesmunicipalities Regionalegional ooff Taamama sesewweerraage officofficee Reclamation Center） Reduce energy consumption Technical supportsupport We will try to raise the level We are coordinating with of sewer business in the Tama municipalities on training to area by providing technical ensure that sending in/taking Volume of renewable energy Renewable energy, etc. Image of sewerage information exchange support and human resource in raw night soil smoothly at meeting among the 30 municipalities of Tama development support to the time of disaster. Volume of energy saving municipalities. 20% or more of percentage Total energy consumption Purchase volume of energy Measures Planning Incorporation of Independent Treatment Areas From 2014 to 2024 fiscal years In order to incorporate independent treatment districts into the regional sewerage area when improvement work such period as renewing facilities, implementing advanced treatment and carrying out improving earthquake-proofing is difficult, we will consult with the relevant municipalities and organizations and promote the necessary procedures and facility improvements, as well as provide appropriate technical assistance. In July 2015, we incorporated the separate sewer area Read the 2-D code for more about of independent treatment district of Hachioji City ahead of the other areas. FY2024 Target "Smart Plan 2014".

Plan to incorporate independent treatment districts Measures Earth Plan 2017 (Sewerage Plan for the Prevention of Global Warming)

Since July 2015, Tama River incorporation of separate area in Kitano treatment Hachioji Water Senkawa River Target Reduce greenhouse gas emissions by 25% or more by FY2020 (ﬁrst phase) and by 30% or more by Tachikawa City FY2030 (second phase) compared to FY2000. area was started Reclamation Center Mitaka City For entire incorporation Asakawa River Nishikicho Treatment Facility East Treatment Tachikawa City・Nishikicho in FY2020, water Facility treatment facilities are Treatment Facility streamlined. Kita-Tama Nigo Nogawa Water Reclamation Contributing to global Hachioji City Amount of reduction Reduction of more Center（tentative name）（10,000 t CO2） warming prevention Kitano Treatment Facility Water Reclamation by taking measures than 30% Center Regional sewerage area For entire incorporation in Amount of increase in emissions CO2 reduction: 320,000 t Independent treatment area incorporated into regional sewerage FY2023, water treatment if no measures are taken. Independent treatment area to be incorporated into regional sewerage facilities are streamlined. Greenhouse Gas Hachioji City・Kitano Emissions 106.5 Treatment Facility 79.6 79.8 Planning 74.5 From 2017 to 2030 ﬁscal years ○Sewerage works in the Tama District will be optimized by taking advantage of economies of scale to achieve period reduced costs for facilities updates and operations and maintenance ○Water environment in Tama District will be improved by introducing advanced treatment. FY2000 FY2016 FY2020 FY2030 ○The Tama District is contributing to the creation of a highly disaster-resistant metropolis by allowing sewerage Base Target Target and sludge treatment to become possible at wastewater treatment plants, which serve as a backup for the Read the 2-D code for more about basin-wide sewerage system, allowing treatment functions to be secured in the event of a major earthquake, etc. "Earth Plan 2017".

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SEWERAGE in TOKYO 2020 8 Principal Measures for Regional Sewerage System ／ 9 Energy Management and Global Warming Countermeasures Our efforts Expansion of the utilization of renewable energy 10 Sewerage Facilities Supporting Our Daily Lives

We will secure as much energy as possible in the sewerage business by ourselves by further utilizing renewable energy. Sewers Sand, soil and garbage that gets into 【Image of small-scale hydroelectric generation facility】【Example case of introduction of solar power generation facility】 sewers naturally settles and accumulates over time. If they are left for a certain amount of time, they might prevent ﬂow Power generation facility of sewage, cause odor, or overﬂow during heavy rain. Sewers are also possible to collapse by deterioration, the load and Water treatment facility vibration caused by heavy vehicles, or by Drop of discharge water ground subsidence. Therfore, the Bureau is cleaning, checking and repairing the sewer system Inspection of sewers Checking a manhole lid on a regular basis in order to keep the by man power. function of sewer system appropriate.

Solar panels with the capacity of 1,000kW (megawatt class) were installed as covers for Small-scale hydroelectric generation facility odor control at water treatment facility.

Our efforts Further promotion of energy saving

Sewers cleaning by man power We will further promote energy conservation and reduce energy consumption. Inspection of laterals using a simple video camera

【Example cases of introduction of energy saving type sludge concentrator】【Image of energy autonomous incineration system】 rest to transfer sewage to wastewater treatment plants rapidly.

Pumping Station ・Utilizing centrifugal force Sewage is discharged at all hours of the day or night. There- Waste heat fore, pumping stations are working 24 hours a day without a Dehydrated sludge with further rest to transfer sewage to wastewater treatment plants rapidly. ・Large volume of electricity usage reduced moisture content Power generator During rainfall, especially typhoons or heavy rain, the huge Increasing combustion temperature amount of stormwater enters sewers from street inlet, and N2O is reduced approximately by 50% pumping stations have to discharge the stormwater into 【Existing sludge concentrator】 Auxiliary fuel Electricity rivers or the sea quickly to protect the streets from ﬂooding. Not necessary These functions of pumping station are secured by the Self-supply necessary electricity through unfailing operation of pumps, regular equipment inspection ・Utilizing gravity power generation utilizing waste heat and maintenance.

Electricity Not necessary ・Small volume of electricity usage Ultra-low moisture content type dehydrator Inspection of pumping equipment Energy autonomous incineration furnace 【Energy saving type sludge concentrator】 Wastewater Treatment Plant Wastewater treatment plants must treat sewage as it flows in Our efforts non-stop, 24hours a day. If the centers should stop to function Examination and introduction of energy smart management properly, pollution would spread quickly into our rivers and sea. Microorganisms play an important role in the treatment and they We will study and introduce efforts to shorten the operation time of sludge pumps, etc. and reduce electricity consump- turn the contaminants in the sewage into the sludge.In order to tion by increasing the concentration of sludge pulled out from the first sedimentation tank and sludge sent to the keep the function of the microorganisms active and remove sludge treatment facility. contaminants from sewage securely, we perform water quality tests for influent and effluent, maintenance, inspection, and monitoring of equipment constantly. Additionally, we take measures against global warming proactively by always considering energy saving possibilities in the maintenance and management of the facilities. Main monitoring room in Wastewater Treatment Plant

24 25

SEWERAGE in TOKYO 2020 9 Energy Management and Global Warming Countermeasures ／ 10 Sewerage Facilities Supporting Our Daily Lives 11 Expansion of various services Measures Utilization of potential of sewerage system We will create a good urban environment by utilizing the resources and energy of sewerage effectively and using the upper space of the facility.

Measures Strengthening Crisis Management To also secure sewerage functions in dangerous times such as disasters or serious accidents, we will strengthen our Our efforts Utilization of reclaimed Our efforts Utilization of heat of sewage emergency response abilities based on the core pillars of improving emergency restoration systems, strengthening wastewater disaster prevention measures through coordination with municipalities, and enhancing of risk communication for We form the water circulation of the city by utilizing We use sewage heat as a disaster preparedness. Spring Summer Autumn reclaimed wastewater as a valuable water resource of the heat source for cooling and Winter city. We supply approximately 10,000 ㎥ of reclaimed waste- heating in 13 wastewater water per day to 196 facili- treatment plants and 3 Improve emergency restoration systems for dealing with large-scale Air Temperature Our efforts ties in 7 areas as water for districts by utilizing the Temperature of sewage earthquakes such as an earthquake directly hitting Tokyo. colder Sewage is toilets and other purposes. temperature characteristics warmer We will work to improve the emergency restoration system We also utilize reclaimed of sewage which is "cold in water for cleanup projects the summer and warm in by premeditatedly fostering human resources with the know- Air Temperature how to deal with crisis quickly and precisely at the time of of depleted rivers and the winter" compared with disaster through practical training. water for Seseragi no Sato air temperature. Park. Clear stream revival business(Meguro river)

Our efforts Effective utilization of the upper space of facilities

We contribute to town planning by utilizing the upper space of the sewer facility. We participate in the Tokiwabashi District heating and cooling area Decision-making training at Disaster Response Headquarters District Redevelopment Project of Tokyo Station Nihonbashi District heating and cooling business at Koraku 1-chome are Exit as a landowner. We will in Bureau of Sewerage Disaster Preparedness Drill Rainbow Bridge reconstruct the aging pumping station, develop new Our efforts Recycling of sewage sludge Our efforts Efforts for disasters such as an earthquake directly hitting Tokyo facility that stores particularly dirty sewage in the early We will promote recycling of sludge to extend the life of stages of rain, and lend the ・We will expand the number of manholes that can be desig- limited landﬁll sites. The resource conversion rate has upper-level section to private nated as temporary toilets in cooperation with municipali- Tokyo Sta decreased sharply since radioactive substances were detect- business operators to contrib- . ties in 23 wards in order to secure toilet functions. ed from the sludge due to the nuclear power plant accident. ute to community develop- ・We will carry out training in cooperation with municipalities However, we resumed resource recycling of particle-size ment of the entire district. Tokiwabashi District Redevelopment adjusted ash and others, following the decrease in the for smooth operations when carrying in and receiving night Project using the site of the pumping station soil in a disaster. (Source: Mitsubishi Estate Co., Ltd.) concentration of radioactive substances.

Measures Promotion of odor prevention countermeasures in building pits To support customers' comfortable lives, we will control odor in building pits and contribute towards shaping of a An enlarged image comfortable urban environment. Shown by a blue rubber cap Our efforts Response to odor in building pits Bad effects of odorous emission Deterioration of Coordinated training among municipalities image of building As a preventive measure against the emission of odor from build- A manhole that can be for carrying in and receiving night soil Leaving of Conﬂict with Offensive Deterioration of used as a temporary toilet ing pits, the Bureau surveys buildings in Tokyo’s representative tenants Odor Control Act image of town districts such as Nihonbashi, Ginza and Shinjuku. We request building An example of the temporary toilets that municipalities in Tokyo have readied Complaints managers to make improvements if their buildings have problems. We are going to further expand the areas where the measures Our efforts Communication of information in normal times are taken towards the Tokyo 2020 Olympic and Paralympic Games and implement preventive maintenance measures.

We will communicate information about Strengthen cooperation with our various seismic strengthening efforts at Our efforts our facilities at every opportunity, such as relevant departments Public stormwater inlet during the Tokyo Metropolitan Government It is important for building managers to properly maintenance Comprehensive Disaster Management Drill. building pits to eliminate the odor from them. We will work close- Building pits It stinks horribly! ly with the related departments of cities and wards and effectively Odor comes out through public sewers. address the building pit odor to implement proper guidance based Drainage facilities (on site) ※Managed by building owners on the law. Public sewer (public road part) ※Managed by Bureau of Sewerage However, public rainwater basin that receives drainage In Tokyo, we have established "guidelines for the structure and maintenance of from the road is managed by the road administrator. Exhibition Booth of Bureau of Sewerage at the drainage tanks in buildings" and prepared manual that summarizes knowledge Security & Safety Trade Expo (RISCON TOKYO) and response procedure to address building pit odor. A scene of Tokyo Metropolitan Government 26 27 Comprehensive Disaster Management Drill SEWERAGE in TOKYO 2020 11 Expansion of various services Measures Promotion of Technological Research and Development Measures International development activities for the Tokyo sewerage systems

In order to maintain and improve the sewage service, we are systematically proceeding with technological research and The Bureau of Sewerage, Tokyo Metropolitan Government is involved in international activities in order to contribute development concerning the challenges that the business faces and the issues which will become risks in the future, and lead to solving problems of countries and regions where sewerage facilities have not been adequately prepared or sewerage Japan's sewage technology. is not fully functioning even though sewerage facilities had been prepared, and to activate sewerage business and strengthen industrial power of Tokyo and Japan by encouraging sewerage related companies to expand overseas.

Our efforts Promotion of “Technological Research and Development Promotion Plan 2016” Our efforts Our efforts Our efforts

In order to achieve the goals of the "Management Plan 2016" and efficiently solve on-site technological issues through Promotion of infrastructure de- Strengthen information Promotion of personnel technological development, we formulated the "Technological Research and Development Promotion Plan 2016" with the velopment projects overseas transmission exchange and training planned period from FY2016 to FY2020. Utilizing the technology and Utilizing opportunities such as For the purpose of solving We will continue to enhance our four principles to further advance technological development efficiently, and ICT (infor- know-how of Tokyo sewerage international conferences hosted by common problems in cities we will mation communication technology) utilization and operation and maintenance related research projects. system, we will provide technical overseas water environment related promote technical exchanges with support according to the needs of organizations, etc., we will spread sister cities, etc., as well as promote Efforts to promote technology development efficiently partner countries/ regions in cooper- the excellent technologies and human resource exchanges and ation with JICA and other related efforts of Tokyo’ s sewerage system development through such means organizations. In addition, we will to other part of Japan as well as as accepting research teams and We have adapted the method of Management of Technology (MOT) in order to comprehensively promote overseas expansion of overseas, and aim to improve the trainees from various cities in Asia Initiative１ manage from the setting of development theme to project realization in the PDCA cycle. development technologies that have presence of Tokyo. and other foreign countries. been developed by ingenuity in the fields. In order to create and develop innovative technologies and ideas applicable for sewage business, Initiative２ we will further promote open innovation to integrate technologies from various fields.

We will further promote collaborative research, especially with the scheme of“Collaborative research Initiative３ with the premised introduction of developed technology” for enhancing and promoting incentives.

Initiative４ We will strive to improve the technological capabilities of the industry by conducting collaborative research to induce innovations from private enterprises etc. in addition to securing inheritance of technics and know-how.

Our efforts Our efforts

Technological development to protect the Technological development for operation Construction site of a sewage treatment plant in Malaysia Online paper publication Observation visit to the Bureau's customer’s safety and to support a secure and maintenance to ensure stable sewage that utilizes technology of Tokyo’s sewerage system. facilities by high-ranking government and comfortable life functions （出典：LANGAT SEWERAGE PROJECT HP） ofﬁcials from abroad

・Technological development related to ﬂood control ・Technological development for operation and maintenance Water Surface Control Device for improving combined sewer systems

The Water Surface Control Device reduces the outflow of debris from combined sewer systems to public water body and it was jointly developed by three entities, namely: the Bureau; the Tokyo Metropolitan Sewerage Service Corporation (hereinafter referred to as TGS), which is a policy partnership organization; and a private company. It is installed in over 1,700 locations throughout Japan, including Tokyo and other cities. These measures are also being deployed overseas, with licensing agreements having been signed with companies in Germany and elsewhere. Signed a memorandum of understanding on joint In May 2020, we received the Outstanding Civil Engineering Award for “Environment” research with a German company for further Submerged bearing in recognition of these and other contributions to improving the water environment in expanding its use in Europe (May, 2018) Japan and abroad. Water Surface Control Device Sewer during rainfall ①Control Plate（Vertical baffle） Image of submerged bearings used in a Image of great depth sewer cleaning by a robot ②Guide Wall（Horizontal baffle） standby operation stormwater pump As it is difficult to inspect and clean great depth In order to handle recent years’ sudden severe rainfall and sewers by human power, we will make it unmanned improve the reliability of stormwater drainage, technology or labor-saving by utilizing working robots. was developed to lengthen dry operation time of standby-operation stormwater pumps without lubricating water supply. Control plate forms a To public vortex that channels waterbody debris to the wastewa- For details, please see the “Technological Research and Development Promotion Plan 2016” ter treatment plant. PR using models at overseas exhibition on the website of the Bureau of Sewerage. To wastewater treatment plant (September, 2019)

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SEWERAGE in TOKYO 2020 11 Expansion of various services Measures Obtaining "cheering squad" of Tokyo sewerage system Our efforts Initiatives to spread new attraction of Tokyo Sewerage <> The work of the Bureau is usually out of the public eye, so we will explain simply how sewerage works and have customers understand what we do. By enhancing our partnership with customers, we will aim to obtain"cheering squad"of Tokyo sewerage system as many as possible. ・Tokyo Chika Lab In FY 2020, the COVID-19 pandemic resulted in some projects being delayed or discontinued. According to a public awareness survey regarding sewerage, the level of consciousness for sewage works among their twenties is low, at around 10%. In response to this situation, we are conducting a project called “Tokyo Underground Laboratory by Bureau of Sewerage Tokyo Metropolitan Government” to deepen Our efforts Proactive Efforts to Promote PR activities of Tokyo's Sewerage System interest in younger generations. We encourage students invited through open recruitment to deepen their understanding and interest in sewerage through workshops and ﬁeld works, etc., and expect them to create public relations tools that would spread the attraction of Tokyo sewerage from a new perspective which is only unique to students. ・Efforts toward the next level of visualization Sewer is often “underlying” because many of its facilities are underground, and since its existence is taken for granted for everyday lives of customers, the percentage of customers who are conscious about 【Examples of initiatives in FY2019】 sewer is low. For these reasons, the Bureau is promoting PR activities where we proactively provide our customers August 20th August 26th日 October 17th November～December February 12th Progress report information such as the roles, issues, and appeals of Tokyo Sewerage in order to deepen their understand- Workshop Fieldwork Lecture Make a video ing of the sewage works. meeting

・Tokyo Sewerage PR Action Plan 2018 In order to show the basic direction of the next-level visualization initiatives, the “Tokyo Sewerage PR Master Plan” was formulated in April 2017, and as an implementation plan for actually promoting the initia- A total of ﬁve types tives, we formulated the “Tokyo Sewerage PR Action Plan 2018”, in March 2018. of videos have been made public

As the action plan sets out concrete plans for increased visualization over a three-year period ・Simulated VR tour of facilities (FY2018‒FY2020), under the three policy words, “open”, “appeal” and “produce”, we are working to Underground storage sewers are rendered as images by VR tech- deepen our customers’ understanding of the sewage works based on these plans. nology to provide convenient simulated tours of facilities at events and other opportunities. VR TOURS OF the three policy TOKYO SEWERAGE SYSTEM OPEN APPEAL PRODUCE Our efforts Provision of opportunities for sewerage education for children We will make the Tokyo We will appeal the excellence We will produce new sewerage easy to see of the Tokyo sewerage and attraction of Tokyo and being open. its thought. sewerage. Through sewerage education projects such as "Outreach Lectures" and "Elementary School Sewer Research Report Contests", we will cultivate children to understand sewerage properly and become "Sewer Meister ," who act actively thinking about the future water environment. The full text is now available on the website of the Bureau of On "Sewerage Education Website", we publish abundant contents such as games and quizzes by which Sewerage, Tokyo Metropolitan Government. http://www.gesui.metro.tokyo.jp/news/pdf/miseruka_masterplan.pdf children can enjoy learning.（Sewerage Education Website ） http://www.gesui.metro.tokyo.jp/news/pdf/miseruka_actionplan.pdf

Our efforts Initiatives to spread new attraction of Tokyo Sewerage <>

・Sewerage Infrastructure Tour We are also conducting tours of sewerage facilities and construction sites for which tours are not normally provided, offering a fun way to learn more about the Tokyo sewerage system.

A scene of outreach lectures Sewerage for Everyone (sub reader) Elementary School Sewer Research Report Contests

Kasai Water Reclamation Center Koto trunk sewer construction site Tamagawa Joryu/ Hachioji Water Reclamation Center connecting pipe A ﬂyer for the 2019 participant recruitment Sewerage facility parent-child tour Sewerage Education Website 30 31

SEWERAGE in TOKYO 2020 11 Expansion of various services Our efforts Efforts to Increase Contact with Local Customers ・Tokyo Amesh We holds a variety of events such as "Cherry blossoms festival" and "Candle night" to make the wastewater treat- "Tokyo Amesh" has a function to reproduce the rainfall data for the past two hours, in addition to updating ment plant attractions.We also use reclaimed water at Seseragi no Sato Public Garden to create charming water- rainfall situation in and around the Metropolis in real time and showing it in a color-coded way. side spaces as well as use the space on top of our facilities as parks or sports amenities open to the public. The smart phone edition of "Tokyo Amesh" has been released since April 2017. You can now display the current spot by the GPS function or register two spots you would like to such as your company and home. Please use when you go out or prepare for ﬂood due to heavy rain, etc.

2-D code

11 You can obtain URL when 2 you read the mark above. Cherry blossoms festival(Mikawashima Candle night(Mikawashima water Seseragi no Sato Public Garden 2 water reclamation center) reclamation center) (Ochiai water reclamation center) ※Tokyo Amesh is the registered trademark of the Tokyo Metropolitan Government. Our efforts Efforts to Maintain a Good Relationship with Our Customers Icon

・Distribution of Information that is Readily Understood We will provide intuitive information through our web site, on Twitter, E-mail newsletter and via newsletter to Screen image of PC edition of "Tokyo Amesh" give our customers a better understanding of the work we do and to increase their convinience. Icon will be registered when you go through "Menu" > "Add to Home" on Screen image of smart phone your smart phone device. edition of "Tokyo Amesh"

・Construction Information Our web site provides information regarding construction works by the Bureau of Sewerage in the ward area and Tama area. ※Please note that the information does not include construction works performed by municipalities and besides sewerage.

The web site provides a list of construction works and their site maps.

Bureau of Sewerage Bureau of Sewerage Tokyo Metropolitan homepage Twitter account Sewerage Newsletter ・Sewerage Ledger The public can research information on sewers under public roads in the 23 wards area on the ・Management report Bureau of Sewerage website, including the location, size and depth of pipes and the locations of man- The reports are made to inform our customers of the implementation status of major projects and holes and public inlet. This information can also be printed. activities listed in the management plan in an easy-to-understand manner for our customers to ※Please contact the local authority in question for information on sewers managed by them. deepen the understanding of the sewerage business and to receive opinions and requests from the customers in order to reﬂect them in our business.

SEMIS is also accessible at the following Sewer- age Records Reading Room. Location: Facility Information Management ・Environmental Report Division, South area, 27th floor, Tokyo We operated an original environment management system which clarifies the role of sewerage and policy initia- Metropolitan Main Building No.2, 2-8-1 tives to secure comfortable living environment and contribute to the global environment. The results were published as the "Environmental Report". Nishi Shinjuku, Shinjuku-ku In FY2015, we upgraded the system by and adding the further use of renewable energy and the T E L: 03-5320-6618 Open: Monday to Friday 9:00 to 17:00 further energy reduction. ※Sewerage office records cannot be viewed at other offices, Closed: Weekends, holidays, and for the New The results are published as the "Environment and Energy Report." and cannot be faxed, or provided over the phone. Year's season

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SEWERAGE in TOKYO 2020 11 Expansion of various services Our efforts Efforts to Reach Customers Our efforts Countermeasures against inundation for semi-underground house, etc. Every June is designed as “Flooding Countermeasure Strengthening Month”. During this month, we visit the houses with We will conduct survey on public awareness of sewerage and understand interests and awareness of sewerage business a below-ground component (sunken garage, semi-basement, etc.) and distribute leaflets to raise awareness of flood risks to improve public relations. We also use the sewerage monitor system to gather opinions and requests from our custom- from street runoff and sewerage backflow during heavy rain and to encourage preparation for heavy rain. ers. The resulting information is fed back into the operation of the sewers and the management of the Bureau. In coordination with the relevant departments, we are working to communicate the dangers of below-ground

Improvement of the water environment Flood prevention Creating a comfortable living environment building at the construction planning stage, through individual Tokyo city websites, at housing exhibition spaces Improvement of the water environment Flood prevention Creating a comfortable living environment and through design ofﬁces, as well as through various events. 20s 20s I have an interest 30s I have an interest 30s Neithe 40s Neithe I do not have an interest 40s 50s I do not have an interest No response 50s 60s No response

60s 70s andolder 70s andolder Awareness of the "role of sewerage" Interest in "Tokyo Metropolitan sewerage business"

Our efforts Collaboration with the Drainage Consultation Center

Explaining the danger at an event using a model building The "Sewage Consultation Center" was opened as a window where customers can consult when they are in trouble with construction work or odor of wastewater facilities (private sewer or catch basin inside the residential area or private road). Our efforts The "Sewage Consultation Centers" are located at the front desks of some of house connection facility Response to industrial wastewater construction business operators designated by the Tokyo Metropolitan Government. It is difﬁcult to treat wastewater that contains heavy metals or other The mark on the right indicates the consultation center. toxic substances using current sewerage facilities. Even treatable As consultation is free, please do not hesitate to consult us. substances entering the sewerage system in large volumes will be ※ Please be sure to check in advance as it may cost some expenses for estimation and survey. discharged into rivers and other bodies of water without being fully treated. We therefore regulate the water quality of industrial wastewater to preserve the water quality of public water bodies and to protect ・Drainage works should be done by quali- ・Beware of Imposters! sewerage facilities. ﬁed contractors We have received reports of smooth-talking individuals Construction work of drainage facilities (drain pipe, posing as contractors for the Tokyo Bureau of Sewerage. drainage basin, and others in the house and private These imposters offer to clean and repair drains, then use road) in the Tokyo 23-ward areas is not permitted intimidating or coercive tactics on people who refuse to sign Collecting water samples and inspecting other than the drainage equipment constructors desig- a contract. water quality of industrial wastewater nated by Tokyo Metropolitan Government.The list is The Bureau of Sewerage nor any Bureau contractor will on the website of the Bureau. ever conduct inspection, cleaning, or repair of residential plumbing at a customers’ residences for a fee. Our efforts The Bureau of Sewerage, Tokyo Metropolitan Government Designated business operators Search System for restoring drainage facilities in case of a disaster In case of a disaster, as during normal operation, customers have to make a request to the drainage equipment constructor designated by Tokyo Metropolitan Government for construction and other services. For this reason, in order to promptly restore house connection facilities at the time of a disaster, we are providing on our website information on house connection facility construction business operators designated by the Tokyo Metropolitan Government that can respond to restoration works. Our efforts Efforts towards Oil-Free Sewers

・Fat Free Sewers Campaign - urging people ・Request for Installation of Grease Intercepter or House connections (Customer's property) not to pour oil down their sinks Proper Operation and Maintenance

Oil that is poured down drains We implement measures against oil resources such as installa- Houses will stick to sewers causing tion of grease blocking and collecting devices for restaurants and clogging and bad odor. industry groups, request for appropriate maintenance, and visit housing lot side Public sewerage system To avoid introducing fats, oils or to universities and cooking classes to give a "delivery class."

grease intosewers, we encourage Toilet Wash room Bath Kitchen customers to wipe up, soak up or use up fat, oil or grease on plates, Public and private matters boundary Public and private matters boundary

pots and the like before washing Second-ﬂoor drainage Public roads them. Foot path Roadways Housing lot side We also promote education and Rain gutter awareness with our "Diet Recipes" which are designed to inform customers how to use less oil in cooking. Private sewer Public inlet House inlet Public inlet House stormwater inlet

※Read the 2-D code for our "Diet Recipes". Sewer Lateral Public rainwater inlet Manhole Request for Installation of Grease Traps or For maintenance and construction works, please contact one of the Tokyo Metropolitan The Bureau of Sewerage is in charge Proper Operation and Maintenance designated Drainage Facility Construction Businesses by customers themselves. of maintenance and management. 34 35

SEWERAGE in TOKYO 2020 11 Expansion of various services Measures Business Management Structure 12 Living and Sewerage Putting the Bureau of Sewerage that is responsible of business operation/implementation as a center, the Bureau and The policy partnership organization (TGS) and private business operators co-operate by sharing roles based on their ●Example calculate (1 month) respective characteristics to manage sewerage business by further strengthening mutual collaboration. Sewerage Service Charges Cost for 20 m3 of wastewater (average water usage for households with three people) Sewerage business is supported by service charges paid by customers, calculated according to how much wastewater is Rate from ¥ discharged. Often, the sewerage service charge Rate from ¥ ¥ Business management structure Our efforts Business management structure supporting sewerage that下水道事業を支える事業運営体制 supports sewerage business is collected together with the water charge Total ¥ every 2 months to reduce collection costs and to Sewerage Service Charge (including amount equivalent to consumption tax) business (Fractions below 1 yen removed) Cooperation make payment easier. ・The Bureau of Sewerage Core works such as formulation of management policies, construction and ［Certification method of the amount of discharged wastewater] The policy ●Tap water important maintenance management of facilities, and regulation of water partnership Private Sewerage Service Charges (1 month) Sewage is assumed to equal the amount of tap water used. quality. organization businesses ●Water other than tap water (i.e. well water) (TGS) A timer is placed on a water pump to record pumping timeand calculate 3 ・The policy partnership organization Sanitary sewage type Volume (m ) Rate (Yen) the amount of wastewater discharge. Works that have to be done in close corporation with the Bureau of 0～8m3 * For those who operate a business which its amount of water usage is Cooperation Cooperation 3 significantly different from the amount of discharged sewage such as ice Sewerage by utilizing expertise. (Integrated Business 9～20m Management) making, please consult to Operation Management Division,Acco unting ・Private businesses 21～30m3 Department, the Bureau of Sewerage at 03-5320-6573 oreach branch of 31～50m3 the Bureau of Sewerage. Works that can be done by private businesses such as standard works. The Bureau of General wastewater 3 Regarding sharing of roles, we will constantly review it based on changes in Sewerage 51～100m [Sewerage service charge exemptions] socio-economic circumstances, etc. in order to stably provide the best services 101～200m3 Sewerage service charges are reduced in the following situations. ・H ouseholds living on public assistance. 3 with minimum expenses. 201～500m ・F or public interest projects or in other special circumstances. 501～1,000m3 [Temporary Use] 3 1,001m and more In case of temporality releasing sump water correspondingcons truction 3 works and so on, submission of temporary use form is required.Also, this Public Bath 0～8m wastewater 9m3 and more kind of water discharge is also regarded as a billing object of sewerage service charge. Our efforts Construction of integrated business structure with The policy partnership organization (TGS) * The sewerage service charge is the sum of the amount calculated from the table above and the amount equivalent to consumption tax. The handling of future consumption taxes will be dealt with appropriate- Through integrated business management by regarding the Bureau of Sewerage and TGS, the important * When not only tap water, but also well water is included in sewage, the total figures in the ly in accordance with laws and regulations based on the response of the above table is used to calculate the charge. partner that supports sewerage business, as one group, we will strengthen our management structure to national government. provide sewerage services stably in the future. We will promote the use of TGS, share the sewerage business sites, further strengthen Notification in advance is required to install a house connection inside the house. cooperation, and build a structure that can steadily respond to increasing business. We will strengthen human resource development and succession of technology both If installation of house connection inside the residentional area is planed to execute within 23 wards, it is required to submit of which support the sewerage business, such as dispatching young employees etc., who notification to the Bureau of Sewerage 7 days before the date of installation. have been employed due to the fact that a large number of veteran staff retired, to TGS, Also note that drainage facility construction must be carried out by a contractor that has been authorized by the Tokyo Metropolitan which contracts on-site works, in order for them to acquire skills and know-how at the Government to do so. Failure to submit the required notification or use of an unauthorized contractor is subject to penalties. sites of sewerage business. We will also promote personnel exchanges with each other, such as utilizing the Systems with mechanical processing units Bureau of Sewerage as a place for human resource development of TGS employees. Installation of "disposer drainage treatment system" In establishing such integrated business management structure, we will continue to conduct appropriate supervision on TGS from various perspectives such as public Inspection of sewerage facilities Disposers other than "disposer drainage treatment system" interest, service quality, management transparency, etc. in addition to efficiency. by TGS staff members cannot be installed In the Tokyo 23-ward areas according to the Tokyo Metropolitan Sewerage Ordinance Enforcement Regulations. To keep the proper function of the disposer drainage Systems with microorganism processing units treatment system, appropriate maintenance is necessary. Proper maintenance of disposer drainage treatment systems is Measures Human resource development and technology inheritance necessary to maintain their healthy function. Please sign a Staff training is carried out in a planned and continuous manner that enhances the Bureau of Sewerage's organizational, maintenance contract with an operation and maintenance Disposer waste technological and innovative abilities. company. treatment unit Disposer part In case of installation, it is necessary to submit notification of new construction of drainage facilities ※A single disposer cannot be Disposer part and "plan concerning maintenance of disposer installed in the 23-ward areas. drainage treatment system." 東京都下水道局ディスポーザ Disposer waste Our efforts Practical use the Sewerage Technology Training Center treatment unit The Sewerage Technology Training Center Training Building Residential stormwater infiltration facility has various training facilities related to sewerage Sewerage Technology Training Center Rainwater Infiltration in Private Properties work that provide both hands-on and simulated training experiences to promote both early In recent years, increased urbanization has reduced fields and other acquisition of knowledge and technologies and open spaces, resulting in less stormwater infiltration into the ground. Stormwater inflow into sewers has therefore increased, which is one the succession of technologies and work Manhole replica know-how in an efficient and effective manner. Electricity supply testing switchboard cause of flooding damage. Permeable pavement Also, we promote the use of this center by Moreover, in areas with combined sewers, stormwater mixed with Infiltration pipe many people including private sector in order to sewerage is discharged to rivers and other waterways to protect the actively contribute to the human city from flood during heavy rain. resource development and Therefore, in order to reduce stormwater inflow into Public stormwater infiltration inlet Public stormwater infiltration inlet technology succession for the Experimental equipment for the sewers in rainy weather, the Bureau of Sewerage Walking in a pipe industrial wastewater treatment Stormwater infiltration inlet Stormwater infiltration inlet entire sewerage industry. coordinates with local ward governments to promote the installation of stormwater infiltration facilities in residen- Sewer pipe tial areas to promote ground infiltration of stormwater. Public road Residential land（Private property） 36 37

SEWERAGE in TOKYO 2020 11 Expansion of various services ／ 12 Living and Sewerage 13 Finances Outline of FY2020 Budget The FY 2020 budget is the ﬁnal ﬁscal year of the 2016 Management Plan. Our basic policy is to steadily implement the projects in the plan and achieve its targets, while also actively moving forward with initiatives that take into account last year’s typhoon damage. Sewerage in the Ward Area (Public Sewerage Business)

Sources of revenue for ward public sewerage Break down of revenues and expenditures Finances Construction costs Ward Public Sewer Operations Regional Sewerage Operations The sewerage business in the Tokyo 23-wards Revenue expenditures and receipts (from corporate activities) Revenue expenditures and receipts (from corporate activitie) Subsidized works Independent works area is managed as a local municipal enterprise. In Funds transferred from general tax revenues 6.1（18%） Funds transferred from Operating revenues Sewerage Service charges Other Costs to transfer principle, necessary costs for sewerage operations . general tax revenues O&M defrayments 372 0 billion yen 175.6（47%） 71.9（19%） wastewater to wastewater Operating revenues Other 124.5（34%） from local are paid for with independently acquired reve- National subsidy treatment plants 33.3 billion yen authorities 14.1（42%） (1/2 or 5.5/10 Paying back debts 20yen 13.1（40%） nues, such as sewerage service charges from used for construction assistance rate) and improvement Sewerage Service （％） Interest on corporate bonds 0.5 1 customers. charges 100 yen broken down as of facilities Corporate bonds 47yen 100 yen Operation Costs to treat Operating Depreciation, etc. Maintenance wastewater expenditures and Management 19.1（56％） Financial Structure of Ward Public Sewerage Business 20yen 34.4 billion yen costs 14.8（43%） Corporate bonds Interest on corporate bonds 15.8（5%） Costs for collecting Operating expenditures Operation Maintenance Interest on debts used Depreciation and other costs charges Expenditures Revenues 342.3 billion yen and Management costs for construction and 184.6（54%） 10yen Capital expenditures and receipts (from construction of facilities) e 141.9（41%） improvement of facilities National subsidy 3yen Construction defrayment from local authorities 3.0（24％）

Capital revenues ※ Energy management Government subsidies Deficit Construction costs are the costs required to build pipes, Capital expenditures and receipts (from construction of facilities) 12.6 billion yen 8.8（70％） 6.8 Construction pumping stations, and wastewater treatment plants. and Global warming Sludge treatment Improvement countermeasure 3.7 billion yen costs Funds transferred from general tax revenues 44.3（25%） Corporate bonds 8.0（6％） Construction costs are covered by national subsidies, corporate of combined 4.7 billion yen（2％）（2％） Other bonds (long-term loans), etc. sewer system 7.1 billion yen（4％） Corporate bonds Capital revenues ※ （％） Corporate bonds Deficit 8.5billion yen（5％） Improvement costs 2.2 11 (Long-term loans) 179.5 billion yen 80.6（45%） 163.9 Capital Construction costs Operation, Maintenance and Management costs expenditures 14.5（75％） Government subsidies 51.0（28%） Other 3.6（2%） Operation, Maintenance and Management costs cover expenses Earthquake 19.4 billion yen Operation, necessary for maintaining sewerage facilities and operations, and paying countermeasures Repayments on corporate bonds 2.7（14％） maintenance Sewerage Service for interest, etc. 21.0 billion yen（12％） Construction How construction costs are and charges [Sewage These costs are separated into money collected from sewerage service costs Reconstruction *Deficits from capital expenditures and receipts are compensated generally used 180 billion yen with reserve funds from the profit and loss accounts. management treatment costs] charges to pay for sanitary sewage treatment costs, and metropolitan of facilities （％） funds (metropolitan tax, etc.) to pay for stormwater removal costs. Improvement costs 35.0（10%） Flood control 92.3 billion yen 51 costs 42.7 billion yen（24％） Metropolitan funds Capital expenditures Construction costs Repayments on (Metropolitan tax, etc.) Principle of “private expense for sanitary sewage, public expense for stormwater” 343.4 billion yen 180.0（53%） corporate bonds 128.4（37%） Financial Structure of Ward Public Sewerag [Stormwater removal costs, etc.] - Sanitary sewage treatment: Covered by private expense as only specific users receive benefits - Stormwater elimination: Covered by public expense (metropolitan tax, etc.) as society as a whole receives benefits Outline of FY2019 Financial Statement The settled accounts of ward and regional sewerage business are as follows. Regarding revenue expenditures and receipts, revenues were 373.2 billion yen and expenditures were 337.9 billion yen. Net profit was 35.3 billion yen. Sewerage in Tama area (Regional Sewerage Business) Regarding capital expenditures and receipts, revenues were 183.3 billion yen (Excludes Compensated funds) and expenditures were 408.6 billion yen (including construction capital rolled over to the following year). There were capital deficits of 225.3 billion yen, but were compensated with reserve funds from the profit and loss accounts. Sources of revenue for regional sewerage Finances ※Number count might not match with the total sum as fractional amount under displayed unit is rounded off and not adjusted. The sewerage business in Tama area is managed Construction costs as a local municipal enterprise, with a promotion Independent ●Revenue /Capital Expenditures and Receipts (Ward and Regional total) ● Balance Sheet (Ward and Regional Total) Subsidized works works of the operation and construction costs defrayed (March 31,2020) from the appropriate regional authorities. billion yen 500 Fixed liabilities

Financial Structure of Regional Sewerage Business National subsidy Metropolitan O&M defrayments Construction defrayment 1,221.9 billion yen from local authorities (1/2 or 2/3 assistance rate) corporate bonds 450 from local authorities 11.8 2.8 Assets Current liabilities Expenditures Revenues 400 Construction capital rolled 5,950.7 billion yen 271.6 billion yen Other 18.8 Net profit over to the following year Liabilities 55.6 National subsidy 350 27.1 Reversal of long Other 3,094.7 billion yen Construction Construction term advances 000000 Deferred income Metropolitan 3.3 defrayment from defrayment from 300 received 61.5 0.3 Repayments on 1,601.2 billion yen Construction Construction defrayment corporate bonds Compensated corporate bonds costs local authorities local authorities Depreciation and funds from local authorities Funds transferred from 131.0 Fixed assets 250 general tax revenues other costs 229.6 Regional 5,715.1 billion yen Interest on 200.9 funds 125.3 200 corporate Metropolitan bonds 18.4 Funds transferred from corporate bonds general tax revenues Construction costs for regional sewerage system are covered 150 32.8 Operation, Operation and maintenance by national subsidies, construction defrayment from local Construction and Capital funding Government subsidies maintenance defrayment from local authorities, metropolitan corporate bonds, etc. 100 67.2 improvement costs 2,536.3 billion yen Sewerage Operation Maintenance 222.6 Capital and authorities Service charges and Management Current assets management Operation, Maintenance and Management costs 50 158.4 costs Corporate 2,856.0 billion yen bonds 225.6 billion yen costs Metropolitan funds Costs for the operation, maintenance and management of regional 129.6

Financial Structure of Regional Sewerage 73.6 sewerage system are collected from the local authorities, and capital 0 Deferred accounts costs such as interest expences are covered by metropolitan funds, etc. Operating Operating Capital revenues Capital expenditures 0.03 billion yen Surplus revenues expenditures 179.7 billion yen 409.2 billion yen 319.7 billion yen 376.1 billion yen 349.0 billion yen 38 ・Consumption tax and local consumption tax are included in capital expenditures Assets Liabilities・Capital 39 and receipts, but not in revenue expenditures and receipts. SEWERAGE in TOKYO 2020 13 Finances 14 Organization of Bureau of Sewerage, Tokyo Metropolitan Government 15 Tracing Back through the History of Sewerage in Tokyo

Main Bureau Division Address Telephone 1884 ● Construction the Kanda-sewer using brick lined culverts 1908 ● "The Tokyo City Sewerage Plan" is announced (April) General affairs, Personnel, Accounting and Contracting, Planning and 03(5321)1111 2-8-1 Nishi-Shinjuku, Shinjuku-ku Coordinating, Facilities Management and Maintenance, Construction (Metropolitan Government public line) 1913 ● Stage 1 construction of the Tokyo Sewerage System Plan begins with District 2 Regional Sewerage Office 1-7-26 Nishiki-cho,Tachikawa City 042(527)4827 (present-day Mikawashima treatment district) 1922 ● Mikawashima Sewer Treatment Plant starts operations (March) Sewerage Offices 1943 ● Start collecting sewerage service charges 1952 ● Term "sewer treatment plant" changed to "wastewater treatment plant (WWTP)" Branch Offices 1961 ● Sludge treatment facility starts operations (in Shibaura) Sewerage Office address and telephone number Coverage area Branch Office Telephone 1962 ● Bureau of Sewerage is founded (April) Chiyoda-ku Chiyoda Branch Office 03（3270）7325 1964 ● "The Tokyo Urban Sewerage Plan" is changed so sewer planning includes all 23 Wards (February) ▲Planning Diagram of the Tokyo sewer（1908） Chubu Sewerage Office Chuo-ku Chuo Branch Office 03（3668）8661～2 ● Ochiai WWTP starts operations. World's first park on top of a treatment facility opens (March) 2-6-2 Otemachi, Chiyoda-ku ● Mikawashima WWTP starts reusing treated water for industrial purposes (August) 03(3270)8317 Minato-ku (excluding Daiba) Minato Branch Office 03（3798）5243～4 Shibuya-ku Shibuya Branch Office 03（3400）9477～8 1968 ● Tokyo Metropolitan Government starts construction on the Tama Regional Sewerage system, with service Bunkyo-ku Bunkyo Branch Office 03（5976）2516～7 determined by the Tokyo Bureau of Sewerage and Metropolitan Government (June) 1970 ● Sewerage Law amended (statement on contributing to the water quality preservation in public water Hokubu Sewerage Office Taito-ku Taito Branch Office 03（5821）2401、2043 2-1-8 Kuramae, Taito-ku districts included) Toshima-ku Toshima Branch Office 03（3989）8523～4 03(5820)4345 1983 ● Nanbu Sludge Plant starts operations (October) Arakawa-ku Arakawa Branch Office 03（5615）2891 1984 ● Flow of "Nobidome Yosui" is restarted using advanced wastewater treatment water from the Tamagawa- Sumida-ku Sumida Branch Office 03（3622）7005 Jouryu WWTP (August) Minato-ku (Daiba only) Tobu 1st Sewerage Office ● Shinjuku Subcenter District Water Recycling Center starts operations using advanced wastewater 7-1-14 Toyo, Koto-ku Koto-ku 03（3645）9273 treatment water from the Ochiai WWTP (October) Koto Branch Office 03(3645)9643 Shinagawa-ku (Higashi-Yashio only) 1986 ● Sewerage Mapping and Information System (SEMIS) starts (April) ▲Manhole and pipe construction in a sewer pipe behind 1987 ● Wastewater heat recycling system (Urban heat) started at the Ochia WWTP (January) Ota (limited to Reiwa Island) Asakusa Park during the Taisho period（1912 to 1925） Adachi-ku Adachi Branch Office 03（3855）7411 ● Advanced wastewater treatment facility (high-rate filtration) starts at the Ochiai WWTP (April) Tobu 2nd Sewerage Office 1988 ● Tokyo Rainfall Radar System for Tokyo Area (Tokyo Amesh 500) opens (June) 1-2-1 Kosuge, Katsushika-ku Katsushika-ku Katsushika Branch Office 03（3602）5755 1992 ● "The Master Plan for the Second-Generation Sewerage" is enacted (July) 03(5680)1268 Edogawa-ku Edogawa Branch Office 03（5658）4481～2 1994 ● "Kanda sewer" is designated as a Tokyo historical remains (March) Shinjuku-ku Shinjuku Branch Office 03（3363）9931～2 Seibu 1st Sewerage Office ● District air conditioning started in the Koraku 1 Chome area of Bunkyo Ward (July) 3-37-4 Arai, Nakano-ku Nakano-ku Nakano Branch Office 03（5343）5651～2 1995 ● Sewered population in the Wards reaches approx. 100%. (March) 03(5343)6200 Suginami-ku Suginami Branch Office 03（3394）9457～8 ● Flow of the 3 urban channels are restarted using advanced wastewatertreatment water from the Ochiai Kita-ku Kita Branch Officece 03（3969）6490～1 Seibu 2nd Sewerage Office WWTP (March) 4-27-1 Ukima, Kita-ku Itabashi-ku Itabashi Branch Office 03（5965）2161～2 1996 ● "Sludgelight" light-weight aggregate material production facility starts operations at Nanbu Sludge Plant 03(3969)2311 Nerima-ku Nerima Branch Office 03（5999）5650 (April) Shinagawa-ku (excluding Higashi-Yashio) Shinagawa Branch Office 03（3495）0351～2 1998 ● Sewerage Service Charges are revised (June) 2001 ● " Sewerage vision 2001 " is enacted (March) ▲World’s first ever park on top of a Wastewater Nanbu Sewerage Office Meguro-ku Meguro Branch Office 03（3491）7867～8 Treatment Plant（Ochiai WWTP）（1964） 13-26 Yukigayaotsukamachi, Ota-ku 2002 ● Tokyo Amesh internet site opens (April) Ota (excluding Reiwa Island) Ota Branch Office 03（3764）3691 03(5734)5031 2003 ● Former main pump house at the Mikawashima WWTP is designated as a Tokyo Cultural asset. (March) Setagaya-ku Setagaya Branch Office 03（5477）2120～2 2004 ● The term " Wastewater Treatment Plant " is changed to " Water Reclamation Center " (April) * Each of local municipalities is in charge in the Tama region. 2005 ● SEMIS data is published to the internet (April) 2006 ● Connecting pipes between Tamagawa Jouryu and Hachioji Water Reclamation centers is completed (April) Core Facilities Reconstruction Offices 2011 ● To help rebuild the sewerage facilities after the Great East Japan earthquake support teams were sent to Office name Address Telephone Sendai in Miyagi prefecture, Urayasu and Katori in Chiba prefecture (From March onwards) 1st Core Facilities Reconstruction Office 2-1-8 Kuramae, Taito-ku 03（3862）8220 2013 ● "Management Plan 2013" is enacted (February) 2nd Core Facilities Reconstruction Office 1-2-28 Konan, Minato-ku 03（5781）8201 ● Starting to open Important cultural property “Old Mikawashima Sewage Disposal Facilities “to the public (April) Water Reclamation Centers ● Renewal opening of “Tokyo Sewerage Museum Rainbow” (April) ● Opening of “Sewerage Training Center” (October) ▲“Kanda Sewer”designated as a Tokyo historical Reclamation Center name Address Telephone Reclamation Center name Address Telephone remains（1994） ● Commencement of operation of connection pipe(s) between Kita-Tama No.1 and Minami-Tama Water Shibaura Water 1-2-28 Konan, Shingashi Water 3-1-1 Shingashi, 03（3472）6411 03（3930）9731 Reclamation Center Minato-ku Reclamation Center Itabashi-ku Reclamation Centers (October) ● Mikawashima Water 8-25-1 Arakawa, Ukima Water 4-27-1 Ukima, Formulating “Sewerage Emergency Plan as Storm Rainfall Counter-measures” (December) 03（3802）7997 03（3969）2457 Reclamation Center Arakawa-ku Reclamation Center Kita-ku 2014 ● Completing construction of pump house at Nishi Nippori Line, Higashi Ogu Purification Center (May) Sunamachi Water 3-9-1 Shinsuna, Morigasaki Water 5-2-25 Omori ● Formulating “Smart Plan 2014” (June) 03（5632）2180 03（3744）5981 Reclamation Center Koto-ku Reclamation Center minami, Ota-ku 2015 ● Grand opening of “ Shinagawa Season Terrace ”which is a private commercial building in Shibaura Water 3-8-1 Shinsuna, 5-2-1 Jonanjima, Reclamation Center (May) Tobu Sludge Plant 03（3649）9411 Nanbu Sludge Plant 03（3799）1201 Koto-ku Ota-ku ● Starting incorporation of Kitano treatment area in Hachioji public sewerage system in the separate sewer Ariake Water 2-3-5 Ariake, Koto- Kita-Tama Ichigo Water 6-6 Koyanagicho, area to Akikawa regional sewerage treatment area (July) 03（5564）2035 Reclamation Center ku Reclamation Center Fuchu City 2016 ● "Management Plan 2016" was developed (February) 042（365）4302 Nakagawa Water 5-1-1 Nakagawa, Minami-Tama Water 1492 Omaru, Inagi ● Dispatch of staff to Kumamoto City to support restoration of sewer facilities due to the Kumamoto 03（3606）2812 Reclamation Center Adachi-ku Reclamation Center City Earthquake (April) ▲Grand opening of “Shinagawa Season Terrace” Kosuge Water 1-2-1 Kosuge, Kita-Tama Nigo Water 1-24-32 Izumi, ● Commencement of operation of connection pipe(s) between Kita-Tama No.2 and Asakawa Water in Shibaura Water Reclamation Center (2015) 03（5680）1993 Reclamation Center Katsushika-ku Reclamation Center Kunitachi City 042（572）7711 Reclamation Centers (April) Kasai Water 1-1-1 Rinkaicho, Asakawa Water 1-236 Ishida, Hino ● 03（5605）9992 Formulation of “Technical Research and Development Promotion Plan 2016” (December) Reclamation Center Edogawa-ku Reclamation Center City ● Formulation of “Earth Plan 2017”(March) Ochiai Water 1-2-40 Kamiochiai, Tamagawa Joryu Water 3-15-1 Miyazawacho, 2017 ● Release of smart phone edition of “Tokyo Amesh” (April) Reclamation Center Shinjuku-ku Reclamation Center Akishima City 03（3366）6964 042（545）4120 ● Formulation of “Tokyo Sewerage PR Master Plan” (April) Nakano Water 3-37-4 Arai, Nakano- Hachioji Water 501 Komiyamachi, 2018 ● Published the Tokyo Sewerage PR Action Plan 2018 (March) Reclamation Center ku Reclamation Center Hachioji City ● Signed a memorandum of understanding for collaborative research on Water Surface Control Device with Miyagi Water 2-1-14 Miyagi, Kiyose Water 3-1375 Shitajuku, 03（3919）7458 042（494）1451 the German company Steinhardt GmbH (May) Reclamation Center Adachi-ku Reclamation Center Kiyose City ● The 11th IWA World Water Congress and Exhibition was held in Tokyo (September) Counseling in Japanese only． 2019 ● 50th anniversary of the regional sewerage in Tokyo（April） 40 2020 ● Reopening of the renovated Sewerage Technology Research and Development Center (May) 41

SEWERAGE in TOKYO 2020 14 Organization of Bureau of Sewerage, Tokyo Metropolitan Government ／ 15 Tracing Back through the History of Sewerage in Tokyoge Facility Tours

In the interest of preventing the spread of the COVID-19 pandemic, we have stopped some tours and exhibitions. For more information, visit the Bureau of Sewerage website. Tokyo Sewerage Museum“ Rainbow”

Tokyo Sewerage Museum “Rainbow”, located in the Odaiba Ariake District, is a public relations facility for the Bureau of Sewerage Tokyo Metropolitan Goverment. It is an experience type facility that appeals the role and importance of sewer by providing the opportunities to experience the work in sewer, pumping station, central monitoring room, and water quality inspection room that are not allowed to enter usually at "Rainbow Town" in the museum.

Entry fee : Fr ee Ariake

Ariake-1- ark Sta . Tennis Parkennis chome Address 2-3-5 Ariake, Kotoward Ariake, the 5th dge : Decks Tokoyo Beac i nnis P

Aquacity Yurikamome i Br

m Te Odaiba-kaihin- zo Floor of Ariake Water Reclamation Center Odaiba koen Sta. No Ariake water e reclamation center Ariake Tennis no Mori Ariake Park Ariak Fuji Daibaiba Frontier builing Ariake clean center Coliseum Telephone: 03 (5564) 2458 television Ariake Incineration Plant Ariake-2-chome network Bay Shore Road

Closed : Mondays (open on holiday Tokyo Teleport Sta. Rinkai Line Musashino Kokusai-tenjijo Sta. Divercity Tokyo University TOC Ariake Plaza Ariake campus Panasonic center Tokyo Water Science Museum Tokyo Sta . Mondays, closed the next day),and the Musashinodaigaku-mae

year-end and New Year Holidays. Ferris wheel Yume-no-ohashi bridge Aria ke Palette town Tokyo fashion Ariake Ferry WWharfharf Entrance town central Open daily throughout the summer Aomi Sta. building tower Tokyo Big Sight Sta. (July 16‒August 31)Open on Transportation access Sewerage Day (September 10) and The Yurikamome Line: 8 minute-walk from Odaiba-kaihin-koen Station Tokyo Big Sight The Rinkai Line: 12 minute-walk from Kokusai-tenjijo Station By bus: 3 minute-walk from Ariake 1-chome stop Icchoume stop (都05、東16、海01) Tokyo Citizens Day (October 1) 1 minute-walk from Ariake crean center mae stop (都05、東16) on foot By car: Turn north at Ariake 2-chome Signal at National Route 357 (Tokyo Wangan Road) Hours : 9:30 - 16:30（entry until 16:00.） by car

National Important Cultural Property Pumping Station at the Former Mikawashima Sewage Disposal Plant

Since the Pumping Station at the Former Mikawashima Sewage Disposal Plant has a high historical value as the first modern sewage treatment plant in our country, it was designated as a National Important Cultural Property (Building) for the first time in the sewerage field on December 4, 2007. A series of well-preserved structures such as gate chambers and gn’t chambers still remain. Entry fee : F ree Opening hours : 9:00～17:00 Keisei Line Address : 8-25-1 Arakawa, Arakawaward How to use : Reservation is to Oji Machiya Sumida rive Terephone : 03（6458）3940 required to a Sta. facility tour Machiya Sta. Closed day : Tuesdays, Fridays, and the year- Arakawa- National Important Cultural 7-chome Station Property Pumping Station end and New Year Holidays at the Former Mikawashima okyo Metro Sewage Disposal Plant Chiyoda Line Arakawa-nichome Station (Get off) Arakawa-8-chome reservation site Main entrance Meiji-dori Tokyo Sakura Tram Av You can make a reservation from our website. e. （Toden Arakawa Line） Sunpearl Arakawa to Minowa

Kuramae Water House (Kuramae Mizu no Yakata)

It is the only facility in the Tokyo 23-ward areas that you can see sewage actually ﬂowing in a sewer pipe which is buried underground and usually invisible to the public. There is also an exhibition of the manhole iron covers which were actually used. Entry fee : Free Address : 2-1-8 Kuramae,Taito-ku, (H okubu Sewerege Ofﬁce) reservation site telephone : 03（3241）0944 You can make a Closed day : Saturdays, Sundays, Holidays, reservation from and the New Year’s season our website. Opening hours : 9:00～16:30 How to use : Reservation is required to a facility tour

Facility tours of Wastewater Treatment Plants reservation site Facility tours of wastewater treatment plants are available except weekends, holidays, and the year-end and New Year Holidays. Please contact the following about reservations and details.・ You can make a Wastewater treatment plants in the 23 wards ≪Contact point for arranging facility tours≫ reservation from Telephone:03(3241)0944 Hours:9:00 - 17:00 (weekdays)・W astewater treatment plants in our website. Tama area Please contact each wastewater treatment plant (ｐ40)

At the observation facilities of the Bureau of Sewerage, Tokyo Metropoli- tan Government, Pumping Station at the Former Mikawashima Sewage Disposal Plant, Tokyo Sewerage Museum "Rainbow" and Kuramae Water House(Kuramae Mizu no Yakata), we distribute manhole cards for free. Advance reservation may be required depending on the facility, so please contact each facility for details. What is a manhole card? It is a collection card created by Gesuido Koho Platform (Sewerage Public Relations Platform, GKP) in collaboration with local municipalities. They are distributed for the purpose of making people interested in Former Mikawashima Tokyo Sewerage Museum“Rainbow” Kuramae Water House sewerage while enjoying collecting cards. Sewage Disposal Plant (Kuramae Mizu no Yakata)

令和２年10月発行東京都の下水道編集・発行東京都下水道局総務部広報サービス課所在地東京都新宿区西新宿二丁目8番1号 2020（英語版）電話 03-5320-6515