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Oily sewage treatment method and system

A treatment method and a treatment system technology, applied in the field of sewage treatment, can solve problems such as high residual oil content and poor treatment effect, and achieve the effects of improved treatment speed, good environmental friendliness, and reasonable process layout

Pending Publication Date: 2022-05-27
威瑞泰科技发展(宁波)有限公司
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  • Application Information

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Problems solved by technology

[0005] The embodiment of the present application provides a treatment method and system for oily sewage, which solves the problems of poor treatment effect and high residual oil content in the oily sewage treatment process in the prior art, and realizes the efficient treatment of emulsified oil in oily sewage

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  • Oily sewage treatment method and system

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Embodiment 1

[0094] Oily Sewage Treatment Test

[0095] Adopt the oily sewage treatment method described in this application to carry out the treatment test to the oily sewage, take the oily sewage after the three-phase separation of the oil field as the test object, the color of the sewage is black, and the oil content before the treatment is about 2000ppm. image 3 shown. The processing procedure includes the following steps:

[0096] The above-mentioned oily sewage is subjected to preliminary precipitation to remove large particles of sand and gravel; then it enters the first-stage coalescing component, and passes through the first-stage coalescing filter element (under the action of dissolved air water) for coalescing + air flotation separation; The coalescence component is further coalesced + air flotation separation through the secondary coalescing filter element (under the action of dissolved air and water); finally, it is passed into the filter component, and filtered + air flotat...

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Abstract

The invention relates to the technical field of sewage treatment, in particular to a treatment method and system for oily sewage. The treatment method comprises the following steps: S1, carrying out coalescence treatment on oil-containing sewage, and coalescing small oil drops and suspended solids with relatively large particles to form large oil drop separation; s2, carrying out filtering treatment on the sewage subjected to coalescence separation, and filtering out smaller-particle oil drops and suspended solids; wherein at least one of S1 and S2 is combined with air flotation treatment to realize air flotation separation of impurities. The oil-containing sewage treatment method comprises the following steps: firstly, coalescing oil drops and suspended solids which are suspended in sewage and have relatively large particle sizes to form large oil drops for separation through coalescence treatment; the emulsified oil and the suspended solids with small particle sizes are further removed through filtration treatment, a demulsifier / flocculant does not need to be introduced, the oil and the suspended solids in the oily sewage are thoroughly separated through a pure physical method, the treatment effect is good, and the treatment time is short.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method and system for oily sewage. Background technique [0002] Oil in oily sewage mainly exists in three forms: free oil, emulsified oil and dissolved oil. The oil droplet size of free oil is relatively large (≥100 microns), which can be separated by gravity sedimentation, cyclone and air flotation. The oil produced can be recycled later; the particle size distribution of emulsified oil is relatively wide (related to the emulsification method, the particle size ranges from 10-20 microns to several tens of nanometers), and it has a certain stability. Water separation usually requires demulsification or flocculation before separation. [0003] In the prior art, the conventional practice is to first use an inverse demulsifier for demulsification or a flocculant / coagulant to perform flocculation, and then combine the subsequent air flotation and filtration to ...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F1/40C02F1/24
CPCC02F1/40C02F1/24C02F1/001Y02W10/10
Inventor 王建荣王飞王进才
Owner 威瑞泰科技发展(宁波)有限公司
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