Desalting aqueous streams via filled cell electrodialysis

Details Desalting aqueous streams via filled cell electrodialysis Desalting aqueous streams via filled cell electrodialysis

C - Chemistry, Metallurgy

02

F

C02F 1/469 (2006.01) C13B 20/18 (2011.01) B01D 61/44 (2006.01) B01D 61/52 (2006.01) C02F 1/00 (2006.01) C02F 1/28 (2006.01) C02F 1/42 (2006.01) C02F 1/44 (2006.01) C02F 1/46 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2254749

The invention is a process for desalting aqueous solutions, which are initially acidified to a pH of about 3 or less. Then, the acidified solution is fed into a desalting compartment of an electrodeionization cell which contains a suitable ion exchange material and is isolated from an adjacent concentrating compartment by an anion and a cation exchange membrane. The concentrate compartment contains a netting or another suitable material that promotes turbulence in a flowing feed stream. Water is supplied to the concentrate compartment. A DC current passes through the electrodeionization cell to produce a substantial desalination of the feed solution. A less acidic desalted solution and a concentrate waste solution are withdrawn from the electrodeionization cell.

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