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Oily sewage processing method

A treatment method and technology of sewage treatment plant, which are applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. Achieve the effect of low cost, low renovation cost, and improved electrical desorption performance

Inactive Publication Date: 2008-03-12
洪骧龙
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AI Technical Summary

Problems solved by technology

For highly emulsified oily sewage, it is also useful to first add medicine and air flotation to remove 80% to 90% of the oil, and then use the coagulation method to treat it. However, 10% of the oil in this technology cannot be recovered. With the sludge discharged, produce secondary pollution

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  • Oily sewage processing method

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Embodiment Construction

[0017] The method of the present invention effectively solves the problems of secondary pollution caused by discharge, high treatment cost and low recovery rate of waste oil in the existing oily sewage treatment technology. The specific operation steps and procedures are as follows:

[0018] (1) Add coagulant directly to the oily sewage pipeline after being transported to the sewage treatment plant, and transport the oily sewage mixed with coagulant into the mixer, and fully mix the coagulant and oily sewage in the mixer and The reaction occurs to break the gel and demulsify the sewage and form tiny oily alum flowers;

[0019] (2) After the oily sewage that has completed gel breaking and demulsification flows out of the mixer, polymer organic flocculants are added to the pipeline that transports the sewage, so that tiny oily particles are gradually formed under the action of flocculant adsorption and bridging Large alum flowers are oil residues;

[0020] (3) The sewage that h...

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Abstract

The present invention relates to a treatment method of oil-bearing sewage. Megadose coagulants are added in the oil-bearing sewage so as to carry out gel and milk breaking on the sewage and to form small alum flowers, and then polymer organic flocculating agents are added toenlarge the small alum flowers and then oil residues are formed in an oil-receiving flow tank to separate from water, thus sewage is purified. The oil residues are recycled in an oil residue collecting pool by a dirty oil collecting device and then pumped to an oil residue cleaning device, and oil residue cleaning liquor is added after being pumped to enter the oil residue cleaning device again. The oil residues are cleaned and the ''clean'' dirty oil acquired enters an oil gas gathering system then. The cleaning waste liquor acquired after the oil residues are cleaned is added into flow inlet water through a pump according to a certain proportion. The cleaning waste liquor is added in the inlet water as the coagulant to lead the coagulants originally added to be recycled. The present invention leads the treatment of water containing high oil stain to generate no secondary discharge pollution. The oil stain recycling rate reaches to 99 percent and the present invention has the advantages of low sewage treatment cost, few device and technics alternation and low alternation cost. The dirty water after treated meets corresponding standards.

Description

technical field [0001] The invention relates to a treatment method for oily sewage, in particular to a treatment method suitable for highly emulsified polymer-containing oil production sewage and oil refinery sewage. Background technique [0002] The existing treatment method of oily sewage is mechanical degreasing, coagulation sedimentation and filtration. The operation procedure of this method is that the oily sewage enters the oil collection tank, uses the difference in specific gravity of oil and water to carry out gravity settlement, separates the free oil in the sewage, then adds coagulant and flocculant, reacts in the reactor, and the emulsified oil in the sewage The demulsification is obtained, the suspended particles in the oil beads and sewage are combined with the formed alum flowers, and sink to the bottom of the tank to form sludge, the sewage is purified, and finally the sewage is further purified through pressure filtration. Practice has proved that this meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F1/52C02F1/40
Inventor 洪骧龙
Owner 洪骧龙
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