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- Title
Comparison of engineering costs of raw freshwater, reclaimed water and seawater for toilet flushing in Hong Kong.
- Authors
Tang, S. L.; Yue, Derek P. T.; Li, X. Z.
- Abstract
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.
- Subjects
HONG Kong (China); ENGINEERING estimates; DUAL water systems; ENGINEERING economy; WATER supply; FRESH water; SEAWATER
- Publication
Water & Environment Journal, 2006, Vol 20, Issue 4, p240
- ISSN
1747-6585
- Publication type
Article
- DOI
10.1111/j.1747-6593.2006.00036.x