Method of treating waste liquids from photographic processings
AssigneeFuji Photo Film Co., Ltd.
InventorsIsao Shimamura, Haruhiko Iwano
Life of this patent
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Abstract
Ferricyanide ions and/or ferrocyanide ions are removed effectively from a photographic reducer or waste liquid containing them by contacting the waste liquid with a weakly basic anion exhange resin in the presence of ammonium ions and thiosulfate ions.
Claims17
A method of treating a waste liquid from a reducer used for the reducing treatment of photographic printing materials containing ferricyanide ions and/or ferrocyanide ions from photographic processings which comprises contacting the waste liquid with a weakly-basic anion-exchange resin in the presence of ammonium ions and thiosulfate ions.
A method of removing ferricyanide ions and/or ferrocyanide ions from a waste solution discharged after subjecting photographic printing plates to a reducing treatment using a reducer containing ferricyanide and a thiosulfate by contacting the waste solution with an ion-exchange resin which comprises using ammonium thiosulfate as the thiosulfate and using a weakly-basic anion-exchange resin as the ion-exchange resin.
Dependencies are inferred from the claim text.