Reclaimed Grey Water Supply Seawater Supply Toilet Flushing Sewage Treatment Plant (SANI Process) Once-Through Cooling System Irrigation and Industrial Uses Freshwater Supply Domestic and Commercial Uses Grey Water Reclamation Plant Sea Sea Sludge • Conceptual diagram of triple water supply system Anoxic Anaerobic Sulfate Reducing NO3 - Recycle Aerobic NO3 - SO4 2S2- N2 [O] [O] NO2 - NH3 O2 CO2 Org-C Heterotrophic Sulphate Reduction Autotrophic Denitrification Autotrophic Nitrification SANI® Process Anoxic NO3 - Recycle Aerobic Heterotrophic Denitrification Autotrophic Nitrification Conventional Biological Nitrogen Removal Process N2 [O] CO2 Sludge Org-C NO2 - NH3 O2 NO3 - Changing the System a n but reduces demand for freshwater. The Hong Kong Airport has been the first organization to put the system into use, with over 50% saving in freshwater demand, reductions in carbon dioxide emissions, and up to HK$20 million saved on electricity bills. “We are altering the language but it will take some time to alter thinking about the one-pipe system that has been in place for so many years everywhere except Hong Kong, and the cost of doing so,” Prof Chen said. “However, the issue has become so large that people are now starting to see this as a good way to maximize water use.” Bringing Prof Chen several steps closer to his dream. IN FOCUS 4
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