Mui Wo sewage treatment works view Toray
About Mui Wo sewage treatment works
Mui Wo is a rural town located in Lantau Island, Hong Kong, with one of its main attractions being Silver Mine Bay and Beach. Rises in population and tourism to this region have resulted in an increased volume of sewage and the need to upgrade the existing wastewater treatment system.
Mui Wo Sewage Treatment Works (MWSTW) was commissioned in 1985 to treat sewage water via conventional secondary treatment consisting of screening and degritting facilities, an oxidation ditch, and ultraviolet (UV) disinfection. With a capacity of 1,190 cubic meters per day, MWSTW treats wastewater from Mui Wo's sewerage network, septic waste collected by private contractors and the Food and Environmental Hygiene Department, and sludge from other Drainage and Services Department (DSD) treatment works.
The plant would not have extra capacity to treat the increasing volume of wastewater, increasing the risk of poor effluent quality that would contaminate nearby beaches. Hong Kong's Special Administrative Region (SAR) government took action to expand the existing wastewater treatment plant. The goal would be to provide public sewerage services to Mui Wo and surrounding villages and protect the water quality of Silver Mine Bay.
The aim of the project was to replace the existing oxidation ditch with a membrane bioreactor (MBR) system, which would significantly reduce the system footprint while producing higher quality effluent. The MBR system would use Toray's MEMBRAY™ flat-sheet MBR technology for the final design.
The MBR system is designed to handle a peak flow of 0.086 cubic meters per second. The system incorporates pre-treatment using a 3-millimeter punch-hole drum screen (2 duty, 1 standby), four MBR trains (3 duty, 1 standby), and ancillary equipment. Each of the trains has an anoxic and aeration tank that houses the MBR modules.
Last updated: 5 August 2020
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