METHOD OF DEEP BIOLOGICAL PURIFICATION OF SEWAGE WATERS FROM ORGANIC COMPOUNDS AND AMMONIUM SALT NITROGEN Russian patent published in 2015 - IPC C02F3/30 C02F101/16 C02F101/30 

FIELD: chemistry.

SUBSTANCE: invention can be used for biological purification of household and close to them in composition industrial sewage waters from organic compounds and nitrogen of ammonium salts. Initial sewage water is processed in alternating zones with reduced oxygen regime and aerobic regime with further settling biologically purified water and recirculation of active silt. First, sewage water is processed in two zones with reduced oxygen regime, where growth of attached microorganisms is performed on planar inert material with specific area of its surface in first zone 17 m²/m³ and in second- 21 m²/m³ and hydraulic load in first zone not higher than 1.38 m³/m² of carrier and in second - 0.43 m³/m² of carrier. After that, processing is carried out in two aerobic zones with specific surface of inert charge material 24 m³/m² and hydraulic load 0.32 m³/m² of carrier in each. Recirculated mixture of sewage water and active silt from last aerobic zone is supplied to beginning of first zone in amount 120-150% of volume of supplied sewage water. Concentration of oxygen in zones with reduced oxygen regime is supported in amount 0.5 mg/l, and in aerobic zones - 4-5 mg/l. Settling of purified water is realised for 1-1.5 hours.

EFFECT: method provides increased stability of purification processes, reduction of energy consumption for air supply, twofold reduction of volume of secondary settling tanks.

1 ex, 1 tbl, 4 cl