METHOD OF SEWAGE WATER PURIFICATION AND SYSTEM FOR ITS REALISATION Russian patent published in 2015 - IPC C02F9/14 

FIELD: chemistry.

SUBSTANCE: method includes biological purification of water, after which solution of reagent and solution of lime milk are additionally and successively introduced into purified water, with mixing of obtained solutions, after which, oxidised coagulated admixtures are precipitated in laminar mode in precipitator by means of precipitation lamellas. Watered sediment is mixed with flocculent, mixed, then, coagulated admixtures are precipitated in laminar mode in precipitator by means of precipitation lamellas, and precipitated admixtures are removed from precipitator by conveyor, and purified water is mixed with water, obtained after biological purification. System of sewage water purification includes device of biological purification, unit of after-purification of liquid and unit of sediment dehydration. Unit of after-purification includes reservoirs, connected by pipelines with devices for preparation of reagent of hydrogen peroxide and lime milk, and equipped with mixers, with one of reservoirs being connected with precipitator with pipeline, in which unit of precipitation lamellas is placed.

EFFECT: reduction of specific capital investments, labour consumption and energy cost of water volume unit purification as a result of reduction of purification stages.

3 cl, 1 dwg