TREATMENT OF EFFLUENTS OF TEXTILE INDUSTRIES TO REDUCE POLLUTANTS INGRESS INTO SURFACE WATERS

Technological schemes of processing textile materials with special chemicals are considered. A method of reducing the concentration of heavy metal ions in waste water of textile manufacturing enterprises based on the combination of effluents from different technological lines is proposed. To reduce the degree of oxidation of chromium (Cr6+ to Cr3+), as well as to transfer salts of copper, cobalt, nickel and other metals from a liquid to a solid state, it is recommended to mix such wastewater with effluents containing sodium or potassium sulfide. The method can be used at enterprises of the chemical, printing, and paint industries. To reduce the content of sulfides of various metals in wastewater and obtain colloidal sulfur, a method of oxidation of such salts by ozonation using a special ozonator is proposed. Ozonation also makes it possible to reduce the content of organic substances in the total volume of effluents to standardized indicators.