FIELD: sewage treatment. SUBSTANCE: bioreactor is comprised of a casing with inlet and outlet pipes and with layers of charge inside. Said layers are arranged downstream of water flow in the following succession: filler peat layer 500 mm high, coarse-grained charge - chemically-active calcium-containing rock, fraction 150-200 mm placed in a single row layer, a layer of peat 500 mm high, a coarse-grained charge crushed stone, fraction 50-100 mm. The chemically-active calcium-containing rock is limestone and/or dolomite and/or marl. EFFECT: improved design. 3 cl, 1 dwg, 1 tbl
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