FIELD: biochemical purification of very concentrated sewage. SUBSTANCE: the plant has biocoagulator- flotation plant operator of the first stage of purification, biocoagulator 14 of the second stage of purification, biofilter 39, fermenter 17, pumping plant 33, combination device 44 and bioreactor 48. Biocoagulator 3 is furnished with water-jet aerator 13. The biofilter is connected to the pump through intermediate vessel 38 and has an aerator with artificial charge 23. Fermenter 17 has sprinkling system 18, biofilter 19, aeration columns 22 and is connected to pump 25. Combination device 44 comprises a biofilter, aeration columns, aeration tank and a settler with artificial charge 45. Afterpurification of sewage is accomplished in bioaerator 48 with artificial charge. EFFECT: enhanced efficiency and reduced cost. 4 cl, 1 dwg
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