FIELD: waste water treatment. SUBSTANCE: after-purification of biologically purified waste waters can be employed for fine cleaning of water from organic and suspended substances. After-purification is performed via filtration through grained charge followed by regeneration of the latter, and, after filtration, drains are treated by microorganisms immobilized on a substrate in multisectional bioreactor with forced aeration in each section. EFFECT: enhanced efficiency of after-purification due to increased duration of working cycle before regeneration and reduced operation expenses. 2 cl, 2 tbl
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