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Work on construction of Stage 1 of the Harbour Area Treatment
Scheme commenced in 1994.
This stage comprised the construction of a chemically-enhanced
primary treatment (CEPT) plant at Stonecutters Island, an interim
outfall tunnel, the comprehensive upgrading of seven preliminary treatment
works and seven tunnels for collecting sewage from urban Kowloon, Tsing
Yi, Kwai Chung, Tseung Kwan O and eastern Hong Kong Island and conveying
it to Stonecutters Island.
The tunnel system was brought into operation between November and December
2001.
click photo to enlarge
For detailed information see HATS
Background.
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