FIELD: deep tertiary treatment and removal of biologically unoxidized contaminations of organic origin. SUBSTANCE: method comprises presaturation of sewage with atmospheric oxygen prior to chlorination, settling for 2 to 30 min, treatment with activated chlorine, filtration through granulated material layer and additional aeration after filtration operation. Invention makes it possible to improve quality of flows by 57 % according to index of biochemistry oxyden demand, by 9 % according to index of chlorine, by 47% according to suspended agents as compared with well-known method. Subsequent treatment of flows with atmospheric oxygen, settling and treatment with chlorine lead to lower purification characteristics prior to filtration, thus cutting down production cycle of purification, putting in or out of operation filtration and treatment of flows with atmospheric oxygen in saturation chamber. Prior to chlorination, possibility of forming organochloric compounds becomes less practical and prior to filtration, filtration cycle becoming longer and charging operation efficiency becomes higher. EFFECT: more efficient tertiary treatment of biologically purified sewage.
