METHOD AND INSTALLATION FOR BIOLOGICAL WASTEWATER TREATMENT Russian patent published in 2017 - IPC C02F3/30 C02F3/02 C02F101/16 C02F101/30 

FIELD: chemistry.

SUBSTANCE: method includes the supply of wastewater into a corridor-type aeration basin and treatment with activated sludge in zones formed over the entire length of the aerotank - at least, one anaerobic (AN), two anoxic (D1, D2) and two aerobic (N1, N2) zones. In addition, wastewater is sent to the anaerobic (AN), anoxic (D1, D2) zones and water is treated in an additional third anoxic zone (D3) located between the aerobic zones of the aerotank (N1, N2). The method also includes an internal anoxic recycle from the first anoxic (D1) or the second anoxic (D2) zone to the anaerobic (AN) zone, separating the activated sludge in the secondary settling tank and recycling it to the first anoxoid (D1) zone. The installation for carrying out the method includes a wastewater supply device (1), an aerotank (2), a secondary settler (3), mechanical agitators (4), and aerators (5). The aerotank is divided by transverse partitions into, at least, one anaerobic (AN), two anoxic (D1, D2), two aerobic (N1, N2) zones, and contains the additional third anoxic (D3) zone located between the aerobic zones (N1, N2).

EFFECT: improving the efficiency and reliability of biological wastewater treatment.

20 cl, 4 dwg