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To meet Singapore's water needs and reduce energy costs of seawater treatment, the National Water Agency PUB and its research partner Evoqua Water have announced a new process that can halve the energy consumption of desalination. Currently, up to 30 percent of Singapore's water needs are desalinized by reverse osmosis, a process that pushes seawater through membranes that filter out salts and dissolved minerals
. kilowatt-hours (kWh) to produce 1 m3 of desalinated water
However, Evoqua Water has developed new desalination modules using electrodeionization technology (EDI). This method uses electric currents to remove dissolved salts and minerals from seawater.
These EDI models have been used in a demonstration plant at Tuas since March and can process 3,800 m³ of water. seawater a day.
According to the Deputy Director General of the PUB, Harry Seah, the energy consumption of this plant is 2.4 kWh per m³ of treated water.
In 2009, both PUB and Evoqua Water had demonstrated – using EDI proof models of the seawater. Therefore, Mr. Seah added that any new desalination plant would also use EDI technology, and he hopes to lower the rate of consumption. of energy at 1.8 kWh per cubic meter. from here to next year, operations will be intensified.
The PUB indicated that it was planning to step up its operations at the Tuas demonstration plant to reach 10,000 m3 of seawater a day from now until the year next.
aside, Dr. Qiao Xiangyi, Evoqua's research and development director, said the production costs of EDI technology have been reduced to a fraction of its original cost – from a half a million dollars to about $ 40,000.
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