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Oil field wastewater treatment method

A treatment method, oilfield wastewater technology, applied in biological water/sewage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the limitation, slow degradation rate of pollutants, hydraulic retention time of anaerobic unit Long and other problems, to achieve the effect of improved biodegradability, improved processing efficiency, and low overall cost

Inactive Publication Date: 2008-01-30
SHANGHAI ZHONGYOU ENTERPRISE GRP CO LTD
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Problems solved by technology

At present, although anaerobic biological treatment is adopted, although the BOD / COD value increases and the biodegradability is enhanced, due to the slow degradation rate of pollutants and the long hydraulic retention time of the anaerobic unit, the popularization and application of this technology is limited.

Method used

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Embodiment Construction

[0014] The present invention will be further described in detail below through examples.

[0015] After oil separation and coagulation treatment, the oil production wastewater of an oilfield contains 221mg / L of COD, 38mg / L of BOD and 31mg / L of mineral oil.

[0016] The processing steps of this embodiment are as follows:

[0017] (1) Oxidation treatment: add oil production waste water in the reaction device from bottom to top, pass into ozone, make the ozone concentration in the reaction device reach 9.55mg / L; Add ultrasonic wave simultaneously, its frequency is 21kHz, and sound intensity value is 0.6 Io; Stir the oil extraction wastewater and ozone evenly to make them fully contact; the residence time of the oil extraction wastewater in the reaction device is 10 minutes;

[0018] (2) Then carry out conventional coagulation treatment: add polyaluminum chloride until the reaction concentration reaches 60mg / L, then add polyacrylamide to make the concentration reach 2mg / L.

[00...

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Abstract

The invention relates to polluted air purification treatment technique field, which is an oil field wastewater treatment method. The steps of the method are firstly oxidation treatment then regular coagulation treatment. The method employs the synergic functions of ozone and ultrasonic to treat emulsion oil extraction wastewater, and then takes emulsion-breaking treatment to the oil, thus improving the coherence of pollutants and benefiting the subsequent coagulation treatment.

Description

technical field [0001] The invention relates to the technical field of wastewater purification treatment. Background technique [0002] In the prior art, physical and chemical methods are used to treat oil production wastewater, and the quality of the effluent usually can only meet the requirements of underground reinjection, and it is difficult to meet the discharge standards of industrial wastewater. Most of the waste water is re-injected underground after being treated by conventional processes, but a large part of it is ineffective re-injection to avoid environmental pollution. The cost is very high, and the re-injection resources are limited. The substance is neither easy to separate nor degrade. The biodegradability of waste water is poor, usually the BOD / COD value does not exceed 0.2, and biochemical treatment is difficult (document 1: Tapan K.gf af., Fate of Crude oil by the Combination of Photooxidation and Biodegradation [J], Environ. Sci.Techn01., 2000, 34 (8): ...

Claims

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Application Information

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IPC IPC(8): C02F1/78C02F1/36C02F1/52C02F3/00
Inventor 翁天波
Owner SHANGHAI ZHONGYOU ENTERPRISE GRP CO LTD
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