Process for treating waste photographic processing solutions

Details Process for treating waste photographic processing solutions Process for treating waste photographic processing solutions

1974-09-13

1977-08-23

Wyse, Thomas G.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 34, 210 37B, 423367, B01D 1506

Patent

active

040439070

ABSTRACT:
Ferricyanide and/or ferrocyanide ions are effectively removed from waste photographic treating solutions by contacting the solutions with weakly basic anion exchange resins. Improved results are obtained with the salt form of the weakly basic anion exchange resin when contacting takes place in the presence of a compound having a buffering action at a pH of 5 to 9, e.g., in the presence of boric acid, metaboric acid or a water soluble borate. Upon regeneration of the anion exchange resin the eluted ions can be reused as a photographic processing solution, e.g., a bleaching solution, with the addition of make up components.

REFERENCES:
patent: 3001868 (1961-09-01), Aueston et al.
patent: 3788983 (1974-01-01), Fries
patent: 3869383 (1975-03-01), Shimamura et al.

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