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Sewage treatment project hits milestone

October 06, 2014
Project update

Project update:  Secretary for the Environment KS Wong (front row, centre) was briefed by the project team on the tunnel construction work.

Another milestone is reached towards improving Victoria Harbour's water quality with the breakthrough of all the sewage tunnel sections under the Harbour Area Treatment Scheme.


Officiating at today's breakthrough ceremony, Secretary for the Environment KS Wong said that when it is commissioned, the system can treat all the sewage generated on both sides of the harbour with a daily capacity of up to 2.4 million cubic metres.


The 21-kilometre sewage tunnel is the deepest in Hong Kong, with the lowest point being 163.8 metres below sea level, and one section connecting both sides of the harbour.


The facilities under stage one of the treatment scheme which opened in late 2001, have provided daily treatment for about 75% of the sewage generated on both sides of Victoria Harbour, significantly improving water quality in the eastern and central parts of the harbour.


Stage 2A will mainly collect sewage from the northern and southwestern parts of Hong Kong Island and channel it to the Stonecutters Island Sewage Treatment Works for treatment and discharge.


The works under Stage 2A started July 2009 and include the construction of a 21-kilometre sewage tunnel with sections at depths varying from about 70 metres to 160 metres below sea level. With the completion of the section crossing Victoria Harbour connecting Sai Ying Pun and Stonecutters Island on September 1, the 21-kilometre tunnel was entirely broken through. 

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