9:45 am - Gathering at the Main Entrance of Stanley Sewage Treatment Works
10:00 am - Visit to Stanley Sewage Treatment Works
11:30 am - Dismiss at Stanley Sewage Treatment Works
(Successful registration will receive details of the visit.)
Stanley Sewage Treatment Works (“Stanley STW”) is a secondary sewage treatment works, built in caverns. It serves a population of over 27,000 in Stanley, Ma Hang, Tai Tam, Chung Hom Kok and Red Hill areas, which currently produces 8,800 m3 of sewage per day. Sewage is collected by outlying sewage pumping stations and transferred to Stanley STW for further treatment.
As a key element of the Stanley Sewerage and Sewage Disposal Scheme drawn up in 1989, Stanley STW was designed and constructed with the latest technology. To maintain the natural environment of the area, Stanley STW was built inside three large caverns, each about 120 metres long, 15 metres wide and 17 metres high together with over 450 metres of road access, ventilation tunnels and shafts. Not only visually unobtrusive, the underground works also spared the neighbourhood with unacceptable environmental impact both during construction and its daily operation. Stanley STW is the first of its kind in Southeast Asia. Stanley STW with a design flow of 11,600m3 per day was constructed from November 1990 to February 1995.