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SEWERAGE in TOKYO 2020

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SEWERAGE in TOKYO 2020 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 immedi- ately 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 preven- tion by operating pumps day and night. 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. 1 SEWERAGE in TOKYO 2020 Contents ／ 1 The Role of Sewerage in Tokyo 2 Sewerage System Epistylis Macrobiotus Philodina Sewerage system is mainly made up of 3 components*: WWTP sewers, pumping stations and wastewater treatment plants (WWTPs)*. Sewers collect and carry wastewater. Grit chamber Primary Secondary Advanced wastewater Reaction tank treatment Pumping stations pump wastewater up so that sewers do not get too deep. Wastewater flows into this sedimentation tank Organic matter in wastewater is sedimentation tank As wastewater flows slowly We introduce following facilities to clean chamber first. Large objects are absorbed to activated sludge, As activated sludge formed treated water further. WWTPs treat and clean wastewater. removed, then sand and grit are through this tank for 2 to 3 hours, where microorganisms break it in a reaction tank flows settled out. solids sink to the bottom. down. As microorganisms grow slowly through this tank for 3 Sand filter/Biologically active filter We perform inspection, cleaning and maintenance every day to keep them up, activated sludge becomes to 4 hours, it is separated Removes residual suspended solids that easy to settle. into effluent and sludge. the secondary sedimentation tank cannot working properly. remove completely. AO process ＊WWTPs in Tokyo are called “Water Reclamation Centers”. Removes nitrogen and phosphorus efficiently in the reaction tank. Rooftop park Factory House Sludge treatment facilities Discharge Industrial pretreatment facility Manhole An industrial pretreatment facility removes harmful substances such as heavy Chlorination tank metals beforehand. Treated water is chlorinated to disinfect coliforms and other bacteria before discharged into rivers and Sewer Pumping Station the sea. Sewers collect and carry wastewater Sewers slope down to let wastewater flow to WWTPs. The internal diameter of naturally by gravity. Wastewater is pumped up the sewer ranges from 25cm to 8.5m. to nearly ground level at pumping stations and flows naturally again. Sludge treatment facilities Sludge is thickened, dewatered and incinerated. Entrance to the Sewer 3 Components of Sewerage ※If a WWTP does not have sludge treatment facilities, it transports sludge to another WWTP with sludge treatment facilities. House Drain Sewer Private sewers in residential areas of our customers are called house drains. The Sewers collect and carry wastewater to WWTPs. The Dust collector connection method to the public sewer system depends on the type of the system sewer network is stretched around Tokyo and the total as shown in figures below. If you are planning to establish, expand or renovate your Flue gas treatment tower length is approximately 16,000km in the 23 wards area. The house drain, you are supposed to notify the sewerage administrator (the Director Smoke stack General of Bureau of Sewerage) in the 23 wards area. In Tama area, please contact common materials used are concrete, polyvinyl chloride Thickener Dewatering (PVC), clay, etc. The internal diameter of the sewer ranges each local municipality. Sludge is settled calmly machine from 25cm to 8.5m. and separated into Thickened sludge is Dewatered sludge is supernatant and thickened dewatered. sludge. incinerated to ashes. Types of Sewer Systems (Combined and Separate Sewer System) Incinerator Wastewater includes domestic wastewater from houses, municipal wastewater from com- munities, industrial wastewater from factories and stormwater. There are two types of sewer systems : combined sewer system and separate sewer system. In combined sewer system, domestic/municipal/industrial wastewater and stormwater are Pumping Station collected and carried to WWTPs together in the same sewer. On the other hand, in separate Sewers slope down to let wastewater flow naturally by gravity. Therefore, sewers get deeper gradually in the ground. Because it is difficult to lay sewer system, they are collected separately. Then only domestic/municipal/industrial waste- water is carried to WWTPs, while stormwater is discharged directly into rivers and the sea. sewers deep in the ground, wastewater is pumped up to nearly ground level at pumping stations and flows naturally again. In this way, wastewater flows to WWTPs by way of pumping stations. ●Combined sewer system ●Separate sewer system Domestic/municipal/industrial wastewater and stormwater are Domestic/municipal/industrial wastewater and stormwater are In addition, pumping stations play an important role of flood prevention in case of heavy rainfall by discharging stormwater from sewers to rivers collected together in the same sewer collected separately and the sea immediately. Rain Gutter Manhole Rain Gutter Housing lot Road catch basin side （Stormwater） Catch basin Road catch basin (Stormwater) （Stormwater） Public and private Private sewer Private sewer matters boundary （ ）Catch basin Lateral Catch basin Stormwater (Domestic wastewater) (Domestic wastewater) Manhole Wastewater Treatment Plant (WWTP) Publicly owned L type Street gutter Road catch basin catch basin （Stormwater） Private sewer (Combined) Publicly owned catch basin WWTPs have facilities to treat wastewater and sludge. Wastewater is treated with a system of tanks and sludge is produced. The volume of wastewater Road side Catch basin Lateral Lateral (Domestic wastewater) (Domestic wastewater) Manhole Manhole Publicly owned infiltration Lateral treated in our 20 WWTPs is approximately 5.16 million cubic meters per day. Combined sewer Legend catch basin(Stormwater) Domestic To treat a large volume of wastewater, we need extensive sites for WWTPs. We save and utilize spaces effectively by introducing two-layer sedimentation ■wastewater Storm sewer HousingH lot Road side Stormwater sside tanks or deeper reaction tanks, etc. In addition, we cooperate with wards and cities to turn rooftop spaces of WWTPs into parks for citizens. ■ Public and private Domestic sewer ■Wastewater matters boundary 2 3 SEWERAGE in TOKYO 2020 2 Sewerage System 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,
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