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Harbour Area Treatment Scheme Stage 2A (HATS2A)

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Harbour Area Treatment Scheme Stage 2A (HATS2A) 14th Meeting of Harbourfront Commission’s Task Force on Water‐Land Interface The Story about cleaning up Victoria Harbour – Harbour Area Treatment Scheme Stage 2A (HATS2A) 24 October 2016 1 Before HATS Kwai Chung Before December Tsing Yi 2001 Stonecutters Island To Kwa Wan Kwun Tong Kowloon Tseung Kwan O North Point Central Sandy Bay Wan Chai East Shau Kei Wan Cyberport Chai Wan Hong Kong Island Wah Fu Aberdeen Ap Lei Chau 2 HATS Stage 1 Commission Kwai Chung Commissioned in Dec 2001 Tsing Yi To Kwa Wan Stonecutters Island Kwun Tong Kowloon Tseung Kwan O North Point Central Sandy Bay Wan Chai East Shau Kei Wan Collects 75% of sewage from both sides of the Cyberport Victoria Harbour and Chai Wan Hong Kong Island conveys them to SCISTW Wah Fu for chemically enhanced primary treatment Aberdeen Ap Lei Chau 3 HATS Stage 2A Commission Kwai Chung Commissioned in Dec 2015 Tsing Yi To Kwa Wan Stonecutters Island Kwun Tong Kowloon Tseung Kwan O North Point Central Collects the remaining 25% Wan Chai of sewage from both sides Sandy Bay East Shau Kei Wan of the Victoria Harbour and conveys them to SCISTW Cyberport Hong Kong Island Chai Wan for chemically enhanced primary treatment and Wah Fu disinfection Aberdeen Ap Lei Chau 4 Grand Ceremony of HATS2A in December 2015 5 Highlights of HATS The Environmental Infrastructure Project Spanning Hong Kong’s Largest Ever Environmental the Greatest Number of Districts in Hong Kong Infrastructure Project World’s Deepest Sewage Tunnel 6 Highlights of HATS World’s Largest Chemically Enhanced Primary Treatment Plant World’s Most Powerful Most Efficient Use of Land for Sewage Pumping System in a providing a Chemically Enhanced Chemically Enhanced Primary Treatment Plant Primary Treatment Plant 7 Awards of HATS2A Project Global Water Awards 2016 – Wastewater Project of the Year (Distinction) Top 10 Engineering Masterpiece in “ The Hong Kong People Engineering Wonders in the 21st Century” 8 Sewage Treatment Process 9 Sewage Treatment of HATS Preliminary PTWs SCISTW CEPT Treatment Treatment Sedimentation Screening Degritting (FeCl3) (polymer) Treated effluent Sewage Cl De-Cl Disinfection Submarine Screenings & Sludge Outfall grit to landfill Dewatered sludge to T-Park for incineration Dewatering centrifuge 10 Sewage Conveyance System (Stage 2A) • The deepest sewage tunnel in the world • Total 21km long (half Marathon) (reach -70 to -160mPD) • To avoid conflicts with the foundation of • 30m rock embedment existing buildings and MTR Jardine House (50 storey building) MTR Sewage Tunnel 11 Stonecutters Island Sewage Treatment Works Stage 1 Sewage Sedimentation Tanks Main Pumping Station No.1 Flow of Sewage Stage 2 Sewage Main Pumping Station No.2 12 12 Stonecutters Island Sewage Treatment Works Main Pumping Station No.1 Stage 1 Sewage Sedimentation Tank Sludge Storage Tanks Main Pumping Station No.2 Flow of Sewage Sludge Cake Silos Flow of Sludge Stage 2 Sewage Marine Vessels Sludge Dewatering Building (Loading Area) 13 13 Delivery of Dewatered Sludge by Sea T. P a r k SCISTW 2.43m 14 Disinfection by Chlorination Dechlorination Facilities 3 2 Effluent tunnel 1 Flow Distribution Chamber (+ Static Mixer) – Chlorination Sodium Hypochlorite Storage Tanks at SCISTW 15 Odour Control at SCISTW Odour Treatment Process 1. Containment 2. Treatment 3. Disposal 16 Odour Control at SCISTW Sludge Dewatering Facilities Main Pumping Station No.2 Main Pumping Station No.1 Chemically Enhanced Primary Treatment (CEPT) Tanks Facilities with Odour Emission at SCISTW are installed with odour treatment facilities 17 Aesthetic Design, Landscaping and Beautification Wan Chai PTW Central PTW Wah Fu PTW 18 Aesthetic Design, Landscaping and Beautification in SCISTW 19 Benefits of HATS Stop sewage from directly discharging into Victoria Harbour Improve water quality of Victoria Harbour: ‐ Remove 70% of Biochemical Oxygen Demand (BOD) 80% of Suspended Solids (SS) over 99% of E.coli from sewage ‐ Increase Dissolved Oxygen (DO) by 13% ‐ HATS stage 1 reduced the E.coli level in the Harbour by 50%, and HATS stage 2A further reduced the E.coli level by 75% Maintain healthy marine environment whilst meeting future development needs Resume cross‐harbour swimming race since 2011 Re‐open Tsuen Wan beaches since 2011 20 Looking Ahead Closely monitor the improvements in the water quality of Victoria Harbour after the commissioning of HATS Stage 2A Land has been reserved for the underground biological treatment plant (HATS Stage 2B) EPD’s Study on Further Enhancing the Quality of Coastal Waters of Victoria Harbour to tackle near shore pollution 21 Thank You 22.
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