METHOD FOR UTILIZING SEWAGE PRECIPITATES OF PLANTS FOR BIOLOGICAL PURIFICATION

摘要

FIELD: utilization of precipitates of sewage being prepared by municipal aeration plants. SUBSTANCE: precipitate is treated by acid washing solution. Then precipitate is neutralized by ammonia. Waste acid solution is affected in turn by electrochemical and chemical regeneration to extract heavy metals, thus treated solution is secondary used for treatment of sewage precipitate. 5-15 % solution of sulfuric acid is used as acid washing solution, precipitate is neutralized by 5-25 % aqueous ammonia solution. EFFECT: improved efficiency of the method. 4 cl, 4 tbl, 1 dwga