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Oil-containing sewage floatation cyclone coupling separation method

A separation method and technology of oily sewage, applied in the direction of separation method, liquid separation, flotation water/sewage treatment, etc., can solve the problem of ineffective separation of tiny oil droplets and sewage separation speed

Inactive Publication Date: 2004-01-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the defects that the traditional cyclone cannot effectively separate tiny oil droplets of sewage and the traditional air flotation technology has a slow separation speed, the present invention develops an air flotation swirl coupling separation technology, which takes advantage of the respective advantages of air flotation and swirl technology, and can Separation of tiny oil droplets can achieve the purpose of fast and efficient

Method used

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  • Oil-containing sewage floatation cyclone coupling separation method
  • Oil-containing sewage floatation cyclone coupling separation method

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Effect test

Embodiment 1

[0028] In the oil-water separation device shown in Figure 1, the oily sewage from the oily sewage tank (1) is sucked, stirred, pressurized and solubilized by the vortex pump (2), and then enters the deoiling cyclone (5). Said sewage has an oil concentration of 583.6mg / L and an air intake of 0.5m 3 / h, the inlet pressure is 0.4MPa, and the bottom outlet pressure of the deoiling cyclone is 0.2MPa. After the operation is stable, the separation efficiency of the oil-water separation method of the deoiling cyclone of the present invention is calculated through sampling analysis at the bottom outlet. was 86.2%.

Embodiment 2

[0030] In the separation device shown in Figure 1, except that the suction volume is 1m 3 / h and the oil concentration in the sewage are except 549.8mg / L, all the other conditions are all with embodiment 1. The separation efficiency of the oil-water separation method of the deoiling cyclone of the present invention is calculated to be 88.4% through sampling analysis and determination.

Embodiment 3

[0032] In the separation device shown in Figure 1, except that the suction volume is 2m 3 / h and the oily concentration in sewage are except 564.5mg / L, all the other conditions are all with embodiment 1. The separation efficiency of the oil-water separation method of the deoiling cyclone of the present invention is calculated to be 90.3% through sampling analysis and measurement.

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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...

Claims

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Application Information

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IPC IPC(8): C02F1/24C02F1/28C02F1/38C02F1/40
Inventor 汪华林裴世瑜钱卓群王建文白志山
Owner EAST CHINA UNIV OF SCI & TECH
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