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Comparison of engineering costs of raw freshwater, reclaimed water and seawater for toilet flushing in Hong Kong
Author(s) -
Tang S. L.,
Yue Derek P. T.,
Li X. Z.
Publication year - 2006
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.2006.00036.x
Subject(s) - flushing , seawater , environmental science , toilet , sewage , water supply , raw water , environmental engineering , reclaimed water , water resource management , hydrology (agriculture) , waste management , sewage treatment , engineering , oceanography , geology , geotechnical engineering , endocrinology , medicine
Hong Kong is one of the very few coastal cities in the world that use ‘dual water supply systems’. Dual water supply involves two distribution systems: a freshwater system for potable use and a seawater system for toilet flushing. This study looks into the feasibility, from an engineering cost point of view, of extending seawater supply into districts where potable water is still being used for toilet flushing, including South District of Hong Kong Island, Sai Kung, Northern New Territories and Northwest New Territories. Besides seawater, raw (untreated) freshwater and reclaimed water (treated effluent from local sewage treatment works) are also considered to be used for toilet flushing for these districts. Six cases are developed for comparison by using the lowest net present value of cost criterion. The result shows that using seawater for toilet flushing in these districts has the best engineering economy.