FIELD: water treatment.
SUBSTANCE: invention relates to treatment of waste water, describes a method of purification, providing for removal of impurities and reducing their concentration in waste water of industrial nature. Industrial waste water containing an admixture of thiourea in an amount of up to 20 mg/dm3 is subjected to purification when adding polyvinyl alcohol to the solution in a calculated amount of 6 weight fractions per 1 weight fraction of thiourea. Coagulation step is carried out with stirring for 2 hours. Formed composition is passed through a column filled with activated carbon of the “ВСК-400” brand, taken at ratio of 20 cm3 per 10 ml of the solution.
EFFECT: provides for waste water treatment to the level of residual content of thiourea of not more than 1.5×10-3 mg/dm3.
1 cl, 3 ex
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