Oil-containing sewage floatation cyclone coupling separation method

Abstract

The present invention discloses a floatation cyclone couping separation method of oil-containing sewage, and is characterized by that because of the special stirring function of the vortex pump, the vortex pump suck oil-containing sewage while sucking air, and the sewage and air are stirred and mixed, the pressure is increased to the greater than or equal to 0.20 MPa, then pumped into the oil-removing cyclone with special structure. Because pressure is suddenly reduced, lots of microfine air bublbes are quickly released out, and the air bubbles and microsmall oil drops can be automatically adhered together under the action of interfacial tension in the cyclone centrifugal force field, because the density of oil drop and air bubble adhered body is greatly less than that of oil phase, so that the small oil drops can be separated out by adopting floatation cyclone combined equipment, and its cleaning rate can be up to above 99%.

Description

technical field

[0001] The invention relates to an oil-water separation method, in particular to a separation method suitable for sewage containing tiny oil droplets. Background technique

[0002] At present, both cyclone and air flotation are effective unit methods for oil-water separation. The known cyclone oil removal method is to use the density difference between the oil and water phases to separate the oil and water by the centrifugal force generated by the cyclone. The cyclone separation technology is fast and efficient, but it is suitable for oil content greater than 0.1%. However, the separation effect on the system with oil content <0.1% in tiny oil droplets is not great; the air flotation method is to inject gas into the water to form a large number of tiny bubbles in the water, and rely on the surface tension characteristics of the tiny bubbles to make The oil droplets automatically attach to the air bubbles to increase the density...

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