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Relocation of Sha Tin Sewage Treatment Works to Caverns

Sha Tin Sewage Treatment Works (STSTW) is the largest secondary sewage treatment works in Hong Kong. It occupies 28 hectares of land and serves a population of about 630,000 in Sha Tin and Ma On Shan Districts, which produce 250,000m3 of sewage per day.

STSTW was commissioned in 1982. To meet the continuous population growth in Sha Tin and Ma On Shan, the STSTW Extension Works were progressively. The treatment capacity of the STSTW was increased to 340,000m3 per day after the Extension Works.

Commissioning Year:1982
Footprint:About 28 hectares
Sewage Treatment Level:Secondary
Design Daily Sewage Treatment Capacity:340,000m3
Current Sha Tin Population:About 630,000
Historical Photos of Existing STSTW
Sewage Catchment Areas in Sha Tin
There are six sewage pumping stations for transferring the sewage collected via the existing underground sewerage network within the six sewage catchment areas in Sha Tin district to the STSTW for centralised treatment.
Effluent Export Route
At present, the treated effluent from the STSTW is pumped to the effluent export tunnel starting at Nui Po Shan of A Kung Kok, and then transported to Kai Tak River in Wong Tai Sin for discharge. This arrangement can make use of the flushing effect by the treated, clean effluent from the STSTW, and hence improve the water quality and environment of the Kai Tak River.
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