Method and apparatus for recycling photographic wash water

Details Method and apparatus for recycling photographic wash water Method and apparatus for recycling photographic wash water

1974-04-22

1976-12-14

Kelley, Mary F.

Gas separation: apparatus

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96 50A, 96 63, G03C 526, G03C 524

Patent

active

039973476

ABSTRACT:
Disclosed are a method and apparatus for processing spent photographic wash water, so that it may be recycled for reuse in the washing step of a photographic developing process, involving passing the spent wash water through an oxidation reaction apparatus to convert any thiosulfate salts in the spent wash water to sulfate salts, and then returning the sulfate water to the developing process for reuse as wash water. In the reactor, the thiosulfate salts in the wash water react in the presence of an oxidation catalyst with oxygen from spent drying air passed to the reactor.

REFERENCES:
patent: 3186942 (1965-06-01), Benger
patent: 3531284 (1970-09-01), Armstrong et al.
patent: 3721624 (1973-03-01), Fisch et al.
patent: 3813246 (1974-05-01), Schranz et al.
1951, Photographic Engineering, vol. 2, No. 3, pp. 148-160, by Levinos, "Stabilization Processing."
West, Photo Sci. & Eng., vol. 9, 1965, pp. 398-413.

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