METHOD OF BIOCHEMICAL SEWAGE TREATMENT FROM ZINC IONS Russian patent published in 1994 - IPC

FIELD: chemical industry. SUBSTANCE: water is filtered by descending flow through nonaerated biodiaphragm with opened surface of grain loading. Upper layer of the latter (height is 25-50 cm) contains activated carbon as 150-200 g coal per 1 m³ of total filter loading. Filtration is carried out at the loading value by water 2,5-3,5 m³ per 1 m³ loading for 24 h. Method ensures to increase the rate of treatment process from zinc ions by 2.7-2.8 times and provides quality of treated water according with standards for treated water disposal to the superficial ponds. EFFECT: improved method of sewage treatment. 2 cl, 1 tbl