FIELD: purification of sewage. SUBSTANCE: sewage is subjected to treatment with a flocculant. The flocculant is a product of reaction of polyethylene polyimine and carbamide in a (3.5-5.0) to 1.0 ratio. The flocculant is prepared at 150 C in an autoclave at a pressure of 5.0 atm. The residual content of suspended matter after the purification operation does not exceed 50 mg/l and that of petroleum products, 6 mg/l. EFFECT: more efficient purification process. 1 tbl
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