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Process and apparatus for treating sewage

A sewage treatment and process technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. Unable to meet the standards of reinjection or efflux, etc., to achieve high-efficiency nitrogen removal capacity, good treatment effect, and the effect of improving solid-liquid separation effect and separation rate

Inactive Publication Date: 2008-09-17
SHANDONG UNIV
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AI Technical Summary

Problems solved by technology

Although the above-mentioned processes can effectively treat sewage, due to the complex chemical composition of oilfield sewage and the difficulty in oil-liquid separation, the sewage treated by the above-mentioned processes still cannot meet the standards for reinjection or external discharge

Method used

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  • Process and apparatus for treating sewage

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Embodiment

[0029] A sewage treatment process, the concrete steps are as follows:

[0030] 1) The oilfield produced water first enters the flocculation sedimentation tank 1, and a high-efficiency composite flocculant is added into the flocculation tank 1. After flocculation and sedimentation, most of the suspended particles and oil can be removed from the effluent;

[0031] 2) The supernatant in the flocculation sedimentation tank 1 enters the hydrolysis acidification tank 2 from the bottom of the hydrolysis acidification tank 2 through the peristaltic pump 5, and the hydrolysis acidification tank 2 is stirred with an electric mixer 13 to prevent the anaerobic sludge from settling; the hydrolysis acidification tank 2 It is set as an upper opening, exposed to the air, in an anoxic state, and inhibits the growth of methanogenic bacteria;

[0032] 3) The effluent from the hydrolytic acidification tank 2 enters the sedimentation tank 3 through the valve, and the sewage continues to undergo an...

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Abstract

The invention relates to a sewage treatment process and equipment thereof, belonging to the technology field of sewage treatment. The process comprises feeding oil field produced water into a flocculating and settling tank for flocculation and settlement; collecting supernatant in the flocculating and settling tank, and feeding into a hydrolysis and acidification tank with an electric stirrer; feeding the effluent from the hydrolysis and acidification tank into a settling tank, and allowing anaerobic hydrolysis; collecting supernatant in the upper part of the settling tank, and feeding into a dynamic bioreactor; removing small-diameter oil drops and macro molecules in the supernatant via aerobic microorganism decomposition and adsorptive filtration by biofilm component; and discharging reinjection water or discharge water coming up to the standards from the dynamic bioreactor. The equipment comprises a flocculating and settling tank, a hydrolysis and acidification tank, a settling tank, and a dynamic bioreactor, wherein a peristaltic pump is arranged between the flocculating and settling tank and the hydrolysis and acidification tank, sludge retune pipe is arranged between the settling tank and the hydrolysis and acidification tank, an electric stirrer is arranged inside the hydrolysis and acidification tank, and an aeration device and a biofilm component are arranged inside the dynamic bioreactor.

Description

Technical field: [0001] The invention relates to a sewage treatment process and equipment, belonging to the technical field of sewage treatment. Background technique [0002] At present, the oil field is in the stage of tertiary oil recovery using polymer flooding, and the polymer used is mainly high molecular weight partially hydrolyzed polyacrylamide (HPAM). The comprehensive water content of the produced fluid is as high as 89.7%, the comprehensive reinjection rate is over 92%, and the remaining part of the sewage is discharged outside. In the tertiary oil recovery process, due to the use of a large amount of polymers and other oilfield chemical additives, the produced fluid contains a large number of chemical substances, which increases the difficulty of the oil-water separation of the produced fluid and the treatment of oily sewage, making the treated sewage Contains a certain amount of petroleum, chemical substances and mechanical impurities, etc., and the water quali...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/52C02F1/40C02F3/30
Inventor 高宝玉张永强卢磊贾玉岩王倩
Owner SHANDONG UNIV
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