FIELD: purification of sewage. SUBSTANCE: sewage is treated by ultradisperse powder of aluminium and/or iron which are prepared by electric explosion of conductor. Quantity of powder is 200-500 mg/l. After mixing within 0.5 h precipitate is removed. Thus purification against Cr, Pb, Th and Sr is carried out. EFFECT: improves efficiency of the method. 3 tbl
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