IN-PLANE MEMBER OF CHARGE FOR BIOLOGICAL PURIFICATION OF WASTE WATER Russian patent published in 1997 - IPC

FIELD: waste water treatment. SUBSTANCE: member contains frame and, prepared by pneumatic extrusion, polymer material to immobilize microorganisms. Frame is made from metal rods forming grate coated by polymer material. Metal frame not only provides rigidity to structure but also takes part in formation of biogalvanic element at biofilm- metal interface. Slight electric current therefrom emerging threefold increases specific rate of biologic oxidation. EFFECT: increased purification degree, completely removed phosphates, and lowered sludge index. 3 dwg, 1 tbl