FIELD: sewage treatment. SUBSTANCE: charge comprises a rigid base in the form of a grating made up of parallel and/or coaxially-arranged bars, and a carrier for immobilization of microorganisms made of foam plastic with closed pores and a density of < 1 in the form of lengths of cord of 5-50 mm dia. One end of these sections is fastened to the grating bars at a distance of at least 1.5 cord diameter between axes of adjacent cords with the distance between grating bars not less than 1.5 cord diameter. EFFECT: higher efficiency. 2 dwg, 1 tbl
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