FIELD: treatment of waste solutions containing organic complexes of heavy metals of sulfur and nitrogen compounds and other compounds which may be used in fixing and like baths in photographic and photochemical production. SUBSTANCE: method involves spraying waste solution in at least one spraying chamber or apparatus in hot oxidizing gas flow, particularly hot oxidizing gas produced in industrial combustion units or furnaces, with nitrate ions and calcium ions being added. EFFECT: increased efficiency in treatment of waste solutions and wider operational capabilities. 8 cl, 1 tbl
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