WATER TREATMENT METHOD Russian patent published in 2013 - IPC C02F1/52 C02F9/02 

FIELD: chemistry.

SUBSTANCE: invention can be used in domestic water supply as well as in treatment of natural, surface and underground water from suspended material. Coagulant is actively mixed in a stream of water, a flocculant is then added and mixed. The stream of water with the added flocculant is fed into a flocculation chamber with rotary motion of the water, said chamber being fitted with inserts in form of a wing section. Further, the stream of water is fed into the coagulation chamber of a settling tank. A portion of the residue formed in the coagulation chamber of the settling tank is recycled into the flocculation chamber at the same time as the flocculant.

EFFECT: invention increases the degree of purity of water, reduces reactant consumption by recycling a portion of the residue and increases the rate of coagulation of astabilised particles which takes place in both the flocculation chamber and the coagulation chamber of the settling tank.