Reverse osmosis electrodialysis combined means

Details Reverse osmosis electrodialysis combined means Reverse osmosis electrodialysis combined means

1979-12-05

1981-08-18

Williams, Howard S.

Chemistry: electrical and wave energy

Apparatus

Coating, forming or etching by sputtering

204301, B01D 1302

Patent

active

042844924

ABSTRACT:
The disclosed apparatus is a combined reverse osmosis electrodialysis assembly having osmotic membranes of anionic-cationic bilaminate ion-exchange composition and having electrodes supplying electrical current which effects water-splitting at the membrane faces to produce acidity in osmotic feed stream to prevent salt precipitation. Periodic current reversal inhibits membrane pore plugging and fouling. Heat sealing of membranes and spiral wound array are useful design variants.

REFERENCES:
patent: 3657106 (1972-04-01), Smith
patent: 3905886 (1975-09-01), Wang
patent: 4043896 (1977-08-01), Ahlgren
patent: 4217200 (1980-08-01), Keden et al.
patent: 4219396 (1980-08-01), Gancy et al.

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