Water Quality of Victoria Harbour and Its Typhoon Shelters
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Drainage Services Department July 2018 Rundown The HATS and its Improvements Enhancing System Robustness & Planned Maintenance of HATS Stage 1 Further Enhancement of Coastal Water Quality 2 The HATS and Its Improvements 3 Pre-HATS (before 2001) Kwai Chung • Preliminary Treatment Works (PTW) Tsing Yi • Screened sewage discharged at PTWs North West Kowloon To Kwa Wan Kwun Tong Kowloon Tseung Kwan O North Point Central Wan Chai Sandy Bay East Shau Kei Wan Cyberport Hong Kong Island Chai Wan Wah Fu Aberdeen Ap Lei Chau 4 HATS Stage 1 (2001 - 2015) Kwai Chung • Preliminary Treatment Works (PTW) Tsing Yi • Screened sewage discharged at PTWs Stonecutters Deep Sewage Tunnel Island STW NWKPTW To Kwa Wan Kwun Tong Submarine outfall of Kowloon Tseung Kwan O SCISTW North Point Central Wan Chai Sandy Bay East Shau Kei Wan Cyberport Hong Kong Island Chai Wan Wah Fu Aberdeen Ap Lei Chau 5 HATS Stage 1 + Stage 2A 6 Water Quality in Victoria Harbour HATS 1 Commissioned Disinfection Commissioned HATS 2A Commissioned 7 Water Quality in Victoria Harbour 8 8 Water Quality in Victoria Harbour 2011 – Cross harbour Race revived, after suspension for 33 years 2017 – Race route resumed at central Harbour: Tsim Sha Tsui to Wanchai 9 Enhancing System Robustness & Planned Maintenance of HATS Stage 1 10 HATS Stage 1 + Stage 2A 11 Enhancing System Robustness Interconnection Tunnel between Main Pumping Stations MPS1 and MPS2 commissioned in Jan 2017) HATS 1 sewage from eastern HATS 1 sewage tunnel (A) A from western tunnel (B) MPS1 A Note: (A) Sewage from Chai Wan PTW, Shau Kei Wan PTW, Tseung Kwan O PTW, Kwun Tong PTW and To Kwa Wan PTW (B) Sewage from Kwai Chung PTW and Tsing Yi PTW 12 Enhancing System Robustness Interconnection Tunnel between Main Pumping Stations MPS1 and MPS2 commissioned in Jan 2017) HATS 2A sewage HATS 1 sewage MPS2 from eastern HATS 1 sewage tunnel (A) A from western tunnel (B) MPS1 A Note: (A) Sewage from Chai Wan PTW, Shau Kei Wan PTW, Tseung Kwan O PTW, Kwun Tong PTW and To Kwa Wan PTW (B) Sewage from Kwai Chung PTW and Tsing Yi PTW 13 Enhancing System Robustness Interconnection Tunnel between Main Pumping Stations MPS1 and MPS2 (commissioned in Jan 2017) HATS 2A sewage HATS 1 sewage MPS2 from eastern HATS 1 sewage tunnel (A) A from western tunnel (B) MPS1 A Note: (A) Sewage from Chai Wan PTW, Shau Kei Wan PTW, Tseung Kwan O PTW, Kwun Tong PTW and To Kwa Wan PTW (B) Sewage from Kwai Chung PTW and Tsing Yi PTW 14 Enhancing System Robustness 連接隧道 (2017年1月啟用) Interconnection Tunnel 淨化海港計劃第二期甲 between MPS1 and MPS2 污水隧道 2號 MPS2 淨化海港計劃第一期 主泵房 東面污水隧道(A) 淨化海港計劃第一期 A 西面污水隧道 (B) MPS1 需更換的 1號及2號水閘 1號 主泵房 A Stonecutters Island Sewage Treatment Works 註釋: (A) 從柴灣、筲箕灣、將軍澳、觀塘及土瓜灣基本污水處理廠之污水 15 (B) 從葵涌及青衣基本污水處理廠之污水 Enhancing System Robustness Interconnection Tunnel between Main Pumping Stations MPS1 and MPS2 (commissioned in Jan 2017) HATS 2A sewage HATS 1 sewage MPS2 from eastern HATS 1 sewage tunnel (A) A from western tunnel (B) MPS1 A Note: (A) Sewage from Chai Wan PTW, Shau Kei Wan PTW, Tseung Kwan O PTW, Kwun Tong PTW and To Kwa Wan PTW (B) Sewage from Kwai Chung PTW and Tsing Yi PTW 16 Enhancing System Robustness Interconnection Tunnel between Main Pumping Stations MPS1 and MPS2 (commissioned in Jan 2017) HATS 2A sewage HATS 1 sewage MPS2 from eastern HATS 1 sewage tunnel (A) A from western tunnel (B) Penstocks No. 1 & 2 MPS1 to be replaced A Note: (A) Sewage from Chai Wan PTW, Shau Kei Wan PTW, Tseung Kwan O PTW, Kwun Tong PTW and To Kwa Wan PTW (B) Sewage from Kwai Chung PTW and Tsing Yi PTW 17 18 Main Pumping Station No. 1 (MPS1) 18 Inlet Chamber of MPS1 Deep location Access opening, 34m below ground level 47m above Safety Precautions Confined Space Hazardous sewerage environment Ground level Inlet Chamber 34 m Penstock 1 Penstocks 1, 2 Penstock 2 Inlet Chamber of MPS1 Sewage from HATS 1 19 Timeline of Works Sequence and Sewage Bypass 20 20 Temporary Bypass at 7 PTWs of HATS 1 Kwai Chung • Discharge Location of PTW • Normal treatment and disposal for Tsing Yi flows from NWKPTW and HATS 2A • Preliminary Treatment Works (PTW) Stonecutters Deep Sewage Tunnel Island STW NWKPTW To Kwa Wan Kwun Tong Submarine outfall of Kowloon Tseung Kwan O SCISTW North Point Central Wan Chai Sandy Bay East Shau Kei Wan Deep Sewage Tunnel Cyberport Hong Kong Island Chai Wan Wah Fu Aberdeen Ap Lei Chau 21 21 HATS 1 Penstocks Replacement 17 years of unceasing operation since 2001 Temporary sewage bypass (in non-bathing season, 5 episodes each not exceeding 2 weeks) Water Quality Modelling – potential impact low and transient Consultation with the ACE and the LegCo EA Panel Inter-departmental working group First bypass completed (20 Feb – 4 Mar 2018) 22 Conditions during the 1st bypass Tsuen Wan Promenade 23 Conditions during the 1st bypass Hung Hom Promenade 24 Conditions during the 1st bypass Siu Sai Wan Promenade 25 Conditions during the 1st bypass Aldrich Bay Promenade 26 Water Quality Monitoring 27 Water Quality Monitoring Results (1st bypass) Beaches Baseline Bypass Post-bypass 28 Water Quality Monitoring Results (1st bypass) Fish Culture Zones 29 Water Quality Monitoring Results (1st bypass) Promenades 30 Marine Stations 31 31 Marine Stations 32 32 HATS 1 Penstocks Replacement 17 years of unceasing operation since 2001 Temporary sewage bypass (in non-bathing season, 5 episodes each not exceeding 2 weeks) Water Quality Modelling – potential impact low and transient Consultation with the ACE and the LegCo EA Panel Inter-departmental working group First bypass completed (20 Feb – 4 Mar 2018) Water quality in line with the model prediction Water quality monitoring results uploaded to DSD website Next bypass episodes (early Nov 2018 and early Mar 2019) Manufacturing of new penstocks underway. Further enhancing the robustness and reliability of HATS system 33 Further Enhancement of Coastal Water Quality 34 Further Enhancement of Coastal Water Quality Wan Chai East Dry Weather Flow Hung Hom Tsuen Wan Bay Interceptors Cheung Sha Wan Tai Kok Tsui New Yau Ma Tei Typhoon Shelter New Central Harbourfront Territorial wide sewer Causeway Bay Typhoon Shelter Shau Kei Wan Typhoon Shelter rehabilitation To Kwa Wan / Ma Tau Kok Odour reduction measures in stormwater networks 35 35 Thank You 36 .