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DSD project won Merit Award in the “2012 Hong Kong Awards for Environmental Excellence – Green Innovations Awards”(Date: 2/5/2013)

The Hong Kong Productivity Council held the Prize Presentation Ceremony of the 2012 Hong Kong Awards for Environmental Excellence on 2 May 2013.  A project of the Drainage Services Department “Co-settlement and Energy Conservation Approach for Sludge Treatment” was awarded a Merit Award of the Green Innovations Awards.  

The Drainage Service Department streamlined the sludge treatment process with the application of “Co-settling Method” which brought an annual saving in electricity of 4.4 million kWh, reduced carbon dioxide emission by 3,000 tonnes and solid waste by 700 tonnes.  The “Co-settling Method” developed by the Drainage Services Department is to provide a shortcut for portion of the surplus activated sludge (mainly micro-organisms) after secondary biological treatment to recycle to the primary tank.  In this way, the sedimentation, biological treatment and sludge thickening processes could be carried out simultaneously and the time and energy consumed in sludge treatment could be saved.  This new method also helped improve the sludge digestion efficiency which boosted up biogas (marsh gas) production and increased energy saving recovered from renewable energy by 2.2 million kWh, achieving double environmental benefits.

Assistant Director (Electrical & Mechanical) - Mr. SHE Siu-kuen (third from right) on behalf of the Drainage Services Department to receive the Award

Group photo of the Assistant Director (Electrical & Mechanical) - Mr. SHE Siu-kuen (third from right), Chief Engineer (Sewage Treatment 1) - Mr. LO Kin-hung (second from right) and Mr. CHAN Cheong-ping (third from left) of the Drainage Services Department and the project team

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