METHOD OF SEWAGE PURIFICATION FROM SUSPENDED SUBSTANCES AND PETROLEUM PRODUCTS Russian patent published in 2014 - IPC C02F9/08 C02F1/28 C02F1/52 B01D21/01 C02F103/44 

FIELD: chemistry.

SUBSTANCE: invention can be applied for purification of surface sewages and oil-polluted industrial discharges. To realise method purified water is preliminarily processed with flocculant with hydrophorbising properties. Then water successively passes stages of sedimentation of sand and large particles, fine mechanic purification from suspended substances, sorption of free and emulsified oil products, additional sorption of soluble oil products on sorbent with fixed microflora. Preliminary introduction of flocculant with hydrophorbising properties reduces load on sorbent, which makes it possible to reduce its volume. Stage of fine mechanic purification is carried out in layer of charge, which consists by 25-35% of the total charge height, made from cylindrical rings with diameter 10-40 mm with ratio of length to diameter (1-2):1, filled in bulk. Additional sorption of soluble oil products is carried out on sorbent with fixed microflora with supply of air oxygen. Dose of flocclulant with hydrophobilising properties constitutes 0.5-2.5 mg per 1 l of processed sewages. Supply of air oxygen is realised with consumption of 1-5 volumes of air per 1 volume of sorbent. Supply of air contributes to more effective regeneration of sorbent with fixed microflora, which makes it possible to prolong term of its service.

EFFECT: method ensures removal of suspended particles in compressed sediment of smaller volume due to reduction of its humidity.

3 cl, 1 dwg, 5 tbl, 4 ex