FIELD: purification of sewage waters. SUBSTANCE: method involves treating sewage waters with blue vitriol; alkalinizing solution with sodium hydroxide and allowing it to settle; providing electrochemical treatment of clarified solution; separating obtained suspension; treating obtained filtrate with activated carbon; concentrating by nanofiltration membrane with selectivity of 10-25% on 1.0% -aqueous solution of sodium chloride. Blue vitriol is used in an amount of 0.15-1.25 g per 1 liter of running water. Alkalinization with sodium hydroxide is carried out till pH value reaches 7.5-10.5. EFFECT: increased efficiency by reduced process time. 3 cl, 1 dwg, 3 tbl
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