Process for recycling photographic wash water

Details Process for recycling photographic wash water Process for recycling photographic wash water

1994-05-19

1996-03-19

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210669, 210684, 210694, 210912, 210917, C02F 900

Patent

active

055001254

ABSTRACT:
A method of treating photoprocessing wash water, comprising in sequence, the steps of:
A) contacting the wash water with an acrylic anion exchange resin to remove silver thiosulfate complex in the water; and
B) contacting the water from step A) with an oxidizing agent that converts thiosulfate ions to sulfate ions.
C) recirculating continuously through the photoprocessing wash tank and steps A) and B).

REFERENCES:
patent: 4632763 (1986-12-01), Wernicke et al.
patent: 4637865 (1987-01-01), Sergent et al.
patent: 5133846 (1992-07-01), De Niel et al.
"Photo Wash Water Recycling System Utilizes Ion Exchange Technology", Robert T. Kreiman, 1984.

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