C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/469 (2006.01) B01D 61/44 (2006.01)
Patent
CA 2151753
The present invention is directed to a method for treating waste water. In order to reduce releasing of neutral salts comprising monovalent ions contained in industrial waste effluent to the environment, the waste effluent to be treated is supplied into a prepositive electrodialysis cell comprising ion exchange membranes which transfer monovalent ions selectively for concentrating the salts, the concentrated stream is supplied into an electrolytic dialysis cell for separating and recovering acids and bases, the subsequently diluted stream is circulated as supplying stream to the prepositive electrodialysis cell, the diluted stream in said prepositive electrodialysis cell is subsequently supplied to and desalted by one or more electro- dialysis cells combined in series, the diluted stream after the desalination is released to the environment, and the concentrated stream is merged to the supplying stream to the prepositive electrodialysis cell. In accordance with the present invention, the concentration of impurities in the recovered acid decreases to less than 1/10, and necessary electric power for dialysis treatment and recovery of the acid and the base decreases to less than 1/2.
Hirose Yasuo
Ishii Yoshinori
Global Nuclear Fuel-Japan Co. Ltd
Hitachi Ltd.
Japan Nuclear Fuel Co. Ltd.
Kirby Eades Gale Baker
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