FIELD: sewage treatment. SUBSTANCE: method involves addition of dimethylglyoxime and alkali in the form of preliminary prepared alkaline solution of dimethylglyoxime to sewage. This solution provides pH value of sewage medium 8-9. Then perfluorinated alcohol is adder up to complete transfer of formed nickel dimethylglyoximate from aqueous phase to spirituous one. Sewage are separated from spirituous phase, and nickel dimethylglyoximate is separated from perfluorinated alcohol. Purified sewage are fed to the basic manufacture, and perfluorinated alcohol - at the next extraction of nickel dimethylglyoximate. Process duration is 30 min, residual concentration of nickel is 0.3 mg/l. EFFECT: improved method of sewage treatment.
