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[Completion of Regulation of Shenzhen River Stage 4] [DSD Research & Development Forum 2017] [Interactive Exhibition “After the Deluge” at the Tai Hung Tung Stormwater Storage Tank] [Successful Completion of the First Stage of Maintenance Works of Penstocks at Stonecutters Island Sewage Treatment Works (SCISTW) Main Pumping Station] [Awards and Honours]
Between 20 February and 4 March 2018, DSD completed the first stage of replacement of two large penstocks inside the Main Pumping Station No.1 (MPS1) of SCISTW. The maintenance works were being implemented in stages, involving five rounds of bypasses (including the first discharge which was completed). The whole project is scheduled for completion in 2020. DSD is reviewing the operational experience of the first round of bypass and environmental monitoring results for improving the future bypass arrangement to ensure safety of works, minimise the duration of bypass as far as possible and reduce environmental impacts. With a view to minmising the impacts of the maintenance works on the environment and the public, DSD appointed engineering consultants to conduct detailed water quality impact assessment when planning the project. A series of mitigation measures were in place during bypass and water quality was closely monitored.
Stage I works included detailed survey and dismantling of two existing penstocks weighing 10 tonnes and 3 tonnes respectively. Located at a unique position at 34 metres underground of the outermost part of MPS1, these penstocks were connected to MPS1 of SCISTW Main and deep sewage tunnels of the Harbour Area Treatment Scheme (HATS) to collect sewage from seven HATS Stage 1 Preliminary Treatment Works (PTW) (including Chai Wan, Shau Kei Wan, Tseung Kwan O, Kwun Tong, To Kwa Wan, Tsing Yi and Kwai Chung PTW). As MPS1 has to be closed to empty the accumulated sewage before technicians can enter to carry out the maintenance works, temporary sewage bypass is necessary at the seven HATS Stage 1 PTWs, i.e. the sewage after preliminary treatment will be directly discharged to Victoria Harbour through submarine outfall without chemically enhanced primary treatment at SCISTW.
Since coming into operation in 2001, SCISTW has been collecting and treating sewage from both sides of the harbour every day. Following chemically enhanced primary treatment and disinfection, the effluent is discharged into the waters west of the harbour. As a result, the water quality of the harbour has been significantly improved.
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The project team dismantled some of the penstock components
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Aerial photo of SCISTW
[Executive Summary] [Traditional Chinese Version] [Simplified Chinese Version] [Graphical Version] [Verification Statement] [Feedback Form] [Meeting the Targets] [Key Statistics and Data] [GRI Content Index] [Sitemap]
Home | Director’s Statement | About this Report | River Revitalisation for the Good of Water | Highlights of the Year | Governance Approach | Our Core Responsibilities | Environmental Management | Caring for Our Staff | Media Engagement Activities | Stakeholder Engagement Activities | Verification Statement | Meeting the Targets | Key Statistics and Data | Feedback Form |
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