Method of treating photographic process waste liquor through concentration by evaporation

摘要

A method of treating photographic process waste liquor through concentration by evaporation, including heating an upper part of photographic process waste liquor to concentrate by evaporation the photographic process waste liquor in such a manner that the difference between the temperature of the photographic process waste liquor in the vicinity of the heated part and the temperature at a bottom part of the photographic process waste liquor may become 5 DEG C. or more, and causing a solute in the photographic process waste liquor to settle.