METHOD FOR TREATMENT OF OILY WASTE Russian patent published in 2009 - IPC C02F1/40 C02F1/24 C02F103/24 

FIELD: technological processes.

SUBSTANCE: invention is related to treatment of sewage water by means of floatation and may be used for extraction of different admixtures, such as, for instance oil products, out of them. Method includes supply of oily waste into reservoir through area of water saturation with air. Treated waters are supplied in pressurised jet through air volume, which is pressurised with the pressure higher than atmospheric pressure, with further floatation treatment of water from admixtures at atmospheric pressure in area, which is isolated from area of waters saturation with air. Then treated waters are subjected to repeated floatation treatment from admixtures at pressure, which is less than atmospheric, in area isolated from zone that precedes floatation treatment of waters from admixtures. At this stage treated waters are heated up to temperature close to boiling temperature with simultaneous removal of produced vented steam. Besides in water-air jet formed in volume of waters adjacent to zone of their saturation with air, air is additionally ejected from zone of sewage waters saturation with air.

EFFECT: higher extent of sewage water aeration with simultaneous increase of uniformity of aeration of oily waste volume with finely dispersed bubbles of air, which provides for possibility of floating finely dispersed particles of admixtures and because of this makes it possible to bring extent of oily waste purification from free (non-dissolved) admixtures to the level of at least 99% from their initial content.

2 cl, 1 dwg