METHOD FOR SEWAGE TREATMENT Russian patent published in 2017 - IPC C02F9/02 C02F1/24 B01D21/01 

FIELD: chemistry.

SUBSTANCE: sewage is supplied into a unit of cylindrical shape (1), at first to precipitation tank (2), then to flotation unit (3) with flotation zone and precipitation zone in secondary precipitation tank (4). After that additional treatment is carried out in granular filter (5) with downward water movement and in sorption filter (6) with upward water movement. Barium chloride and calcium hydroxide are supplied through ejector built in the pipeline for sewage supply. Treated water is collected in treated water tank (7). Flotation unit (3) is divided in four sections three of them being in flotation zone and the fourth one being in precipitation zone. Filters (5,6) are fitted out with removable lids for change of charge, and charges are packed in a mesh cartridge made of non-corrosive material. Secondary precipitation tank (4) is located between the external wall surface of precipitation tank (2) located in the center and the body wall of the treatment unit (1). Precipitation tank (2) has cylindrical shape and conical bottom and the bottom of secondary precipitation tank (4) has a slope from center to periphery and is connected to granular filter (5) through an overflow hole. Unit (1) body is made of light and strong glass-reinforced plastic.

EFFECT: invention allows to effectively remove chromium ions, chlorides, sulfates, suspended substances, synthetic surface active substances from sewage, lower BOC and COC values of treated water due to separate successive operation of treatment units, simple design and mobility.

4 dwg, 1 tbl