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Oil producing wastewater treatment method

A technology of oil extraction wastewater and treatment methods, which is applied in mining wastewater treatment, ion exchange water/sewage treatment, etc., can solve the problems of COD exceeding the standard, effluent cannot meet the discharge requirements, and COD cannot meet the stable standard, etc., and achieve the treatment effect Poor, realize the effect of waste utilization

Inactive Publication Date: 2017-02-15
SUZHOU QINGRAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A combined process of physicochemical and conventional biochemical treatment is usually used to treat oil production wastewater, but the effluent still cannot meet the discharge requirements, and COD exceeds the standard, especially serious
Although advanced treatment methods such as coagulation sedimentation, ozone oxidation, and Fenton oxidation have certain treatment effects, they still cannot achieve stable COD standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The experiment was carried out with a low-concentration oil extraction wastewater with a COD of 150 mg / L, adding a mixture of 717 strong alkali resin and D311 weak alkali resin with a volume percentage of 1:1~2:1, and the dosage was 7L per ton of oil extraction wastewater. After stirring and mixing for 30min~60min, the effluent can be drained.

[0027] After the above process treatment, the water quality indicators of each process section are shown in the table below.

[0028] Process wastewater pH COD / mg / L Raw water7~8150 Effluent 8~920~30

Embodiment 2

[0030] The experiment was carried out with a low-concentration oil production wastewater with a COD of 190 mg / L, and a mixture of 717 strong base resin and D301 weak base resin with a volume percentage of 2:1~3:1 was added. The dosage was 8L per ton of oil production wastewater. After stirring and mixing for 30min~90min, the effluent can be drained.

[0031] After the above process treatment, the water quality indicators of each process section are shown in the table below.

[0032] Process wastewater pH COD / mg / L Raw water7~8190 Effluent 8~930~40

Embodiment 3

[0034] The experiment was carried out with low-concentration oil production wastewater with a COD of 250 mg / L, and 711 strong base resin was added, and the dosage was 10L per ton of oil production wastewater. After mixing for 60 min to 120 minutes, the effluent could be discharged.

[0035] After the above process treatment, the water quality indicators of each process section are shown in the table below.

[0036] Process wastewater pH COD / mg / L Raw water7~8250 Effluent 8~938~42

[0037] In summary, the oil extraction wastewater treatment method of the present invention, for the oil extraction wastewater with a COD of 150-250 mg / L, can be directly treated by using a strong alkali resin or a combination of a strong alkali resin and a weak alkali resin to make the effluent COD Controlling it below 50mg / L solves the current problems of poor treatment effect of low-concentration oil production wastewater and low discharge rate up to the standard, while realizing waste utilization. ...

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PUM

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Abstract

The invention provides an oil producing wastewater treatment method. The method comprises the following steps that oil producing wastewater and basic resin are stirred and mixed for adsorption, the basic resin is strongly basic resin or a combination of strongly basic resin and weakly basic resin. According to the oil producing wastewater treatment method, by treating low-concentration oil producing wastewater through the strongly basic resin or the combination of strongly basic resin and the weakly basic resin, outlet COD can be controlled to be 50 mg / L or below, the problems that at present, low-concentration oil producing wastewater treatment effect is poor, and the standard discharge rate is low are solved, and meanwhile waste utilization is achieved.

Description

Technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating oil extraction wastewater with low and stable effluent COD. Background technique [0002] In recent years, the pollution of water bodies by oil has become more and more serious, and the large amount of oil production wastewater produced in the process of oil extraction and oil and gas gathering and transportation is the culprit of this pollution. In addition to oil slick, emulsified oil and dissolved oil, oilfield wastewater contains a large amount of suspended solids, as well as lignin, foaming agent, barite, clay, polyacrylamide, etc. added in the mining process, which make the composition of the wastewater extremely complex. Usually, a combination process of physical and chemical and conventional biochemical treatment is used to treat oil production wastewater, but the effluent still cannot meet the emission requirements, and the COD exceeding the standard ...

Claims

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Application Information

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IPC IPC(8): C02F1/42C02F103/10
CPCC02F1/42C02F2001/422C02F2103/10
Inventor 陈建军张柯王婷
Owner SUZHOU QINGRAN ENVIRONMENTAL PROTECTION TECH
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