A device and method for treating oily sewage

Abstract

The invention discloses an oily sewage treatment device and method. The device comprises: a water inlet, a water outlet, an oil stain removal part and a suspended matter removal part; wherein, the oil stain removal part includes an oil stain coalescing unit and an oil stain inclined plate precipitation unit , a first baffle is arranged between the oil pollution coalescing unit and the oil pollution sloping plate sedimentation unit; the suspended solids removal unit includes an electroflocculation unit, a suspended solids sloping plate settling unit and a sludge sedimentation concentration unit, the A second baffle is arranged between the electroflocculation unit and the suspended matter inclined plate settling unit, and the sludge settling and concentrating unit is arranged at the lower part of the suspended matter inclined plate settling unit; the oil pollution inclined plate settling unit and the A third baffle is arranged between the electrocoagulation units. The device and method provided by the invention can realize a removal rate of more than 95% of oil and suspended matter in sewage without adding chemicals.

Description

technical field [0001] The invention relates to the field of water treatment, and more specifically, to an oily sewage treatment device and method. Background technique [0002] Most of the oilfields in my country are developed by water flooding, and many years of development have brought these oilfields into a period of high water cut. Due to the extensive application of various chemical agents in the process of oil production, coupled with the extremely complex biological, chemical, physical and other factors in the process of production, the characteristics of the reservoir and the composition of the produced fluid have undergone great changes. A large amount of crude oil is usually called oily sewage. [0003] The traditional oily sewage treatment technology mainly adopts chemical treatment method, which requires a large amount of dosing, high cost of chemicals, and large sludge output. Based on the above shortcomings, the electrochemical sewage treatment process has b...

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Problems solved by technology

At present, the research on electrochemical treatment of oily sewage is mostly focused on electrocoagulation, electric floatation, electrolysis, etc. Using the above electrochemical treatment methods usually consumes a large amount of electric energy due to chemical reactions, resulting in high power consumption. There will be disadvantages such as sacrificial anode and high cost of anode loss

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