FIELD: natural and sewage waters treatment. SUBSTANCE: device has an opened tank 1 with central tube 2. The upper end of tube 2 extends above the water level in the tank and has a gas cap 3 which is connected to an intake duct of ejector 6 through adjusting shutoff means 4 and ozone preparing device. A suction duct of ejector 6 is connected to delivery pump 7. Device further has feed water pipe communicated with the lower part of the central tube, collecting trough 9 and drain pipe 10. Gas cap 3 is provided with vent pipe 11 which is connected to oxygen source 13 via hydroseal 12. EFFECT: improved quality of purification.
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