Method for treating photographic processing waste solution

Abstract

Disclosed is a method for treating a photographic processing waste solution comprising concentrating the photographic processing waste solution containing at least thiosulfate ions, characterized in that there is provided at least one part selected from (i) to (v) shown below: (i) a part for adding sulfite ions or a compound capable of releasing sulfite ions into the photographic processing waste solution at the time or before heating of the photographic processing waste solution; (ii) a part for contact evaporated gas with a catalyst having a metal of the following (a) to (d) or a compound thereof carried thereon: (a) at least one selected from the group VIII elements consisting of iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium and platinum, (b) copper, (c) zinc, (d) manganese; (iii) a part for permitting a water-soluble polymer to exist; (iv) a part for permitting an oxidizing agent capable of oxidizing thiosulfate ions to exist; and (v) a part for adding a pH controlling agent into the photographic processing waste solution in order to maintain pH of the photographic processing waste solution at 3.0 to 11.0.

Dependencies are inferred from the claim text.