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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AI Technical Summary

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 d

Method used

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Examples

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Example Embodiment

[0014] The following examples illustrate the present invention in further detail.

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

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

[0017] (1) Oxidation treatment: add oil production wastewater from bottom to top into the reaction device, and pass ozone to make the ozone concentration in the reaction device reach 9.55mg / L; at the same time, ultrasonic waves are added, the frequency is 21kHz, and the sound intensity value is 0.6 Io; Stir the oil production wastewater and ozone uniformly to make them fully contact; the residence time of the oil production 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, and then add polyacrylamide to make the concentration reach 2mg / L.

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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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