Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...
Patent
1995-06-06
1996-11-26
Phasge, Arun S.
Chemistry: electrical and wave energy
Processes and products
Electrophoresis or electro-osmosis processes and electrolyte...
204525, 204529, B01D 6144, C02F 1469
Patent
active
055781810
ABSTRACT:
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, concentrated stream is supplied into an electrolytic dialysis cell for separating and recovering acids and bases, 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 plural electrodialysis 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, concentration of impurity in 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.
REFERENCES:
patent: 2860095 (1958-11-01), Katz et al.
patent: 3933610 (1976-01-01), Ehara et al.
patent: 3986951 (1976-10-01), Fremont
Derek Pletcher and Frank C. Walsh, p. 358, Fig. 7.14, "Industrial Electrochemistry," Second Edition. (no date).
Hirose Yasuo
Ishii Yoshinori
Hitachi , Ltd.
Japan Nuclear Fuel Co., Ltd.
Phasge Arun S,.
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