FIELD: sorption purification of sewage in pulp and paper, petrochemical, metallurgical and food industries. SUBSTANCE: sorbent is ash resulting from burning slime lignine which is pulp and paper production waste. Ash comprises (wt %): C, 14.0-16.0; Fe2O3, 4.0-6.0; CaO, 2.5-3.5; SiO2, 6.8-7.2; Al2O3, 68.0-72.0. EFFECT: higher degree of purification of sewage of complex composition and cheaper sorption process. 20 ex, 1 tbl
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