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US 7,744,760 B2Granted
Method and apparatus for desalination
AssigneeSiemens Water Technologies Corp.
InventorsFrederick C. Wilkins, Anil D. Jha, Gary C. Ganzi
Life of this patent
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Abstract
A method and apparatus for purifying water are provided. A feed water such as seawater can be fed to a filter such as a nanofiltration membrane to produce a permeate that can, in turn, be fed to an electrodeionization system to produce fresh water.
Claims7
A method of reducing total dissolved solids in seawater comprising:
- reducing a concentration of dissolved solids in the seawater in a nanofiltration device to produce a first partially treated water;
- reducing a concentration of dissolved solids in the first partially treated water in an electrodialysis device to produce a second partially treated water;
- and
- reducing a concentration of dissolved solids in the second partially treated water in an electrodeionization device to produce treated water having less than about 1,000 ppm total dissolved solids and a boron content of less than about 0.5 ppm,
- wherein energy consumption to produce the treated water through the nanofiltration device, the electrodialysis device, and the electrodeionization device is less than about 7 kwh/kgal.
2 more elements
Dependencies are inferred from the claim text.