Sewerage > Technology Employed > Double-decked Sedimentation Tanks
The Stonecutters Island Sewage Treatment Works was designed to handle a huge sewage flow of 1.7 million cubic metres per day under HATS Stage 1. For this purpose, a lot of sedimentation tanks occupying a large area would be required. In order to save space, double-decked sedimentation tanks are adopted. In total, there are 38 double-decked sedimentation tanks, each with a plan area of 60m by 7m.
Longitudinal section of a double-decked sedimentation tank
  Longitudinal section of a double-decked sedimentation tank         
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View of a row double-decked sedimentation tanks
   View of a row double-decked sedimentation tanks

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