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Oil extraction waste water treatment method and its special reaction equipment

A technology of oil production wastewater and reaction device, which is applied in the field of water treatment, can solve problems such as long time, difficult degradation, and difficult separation of pollutants, and achieve the effects of improved biodegradability, improved treatment efficiency, and low overall cost

Inactive Publication Date: 2006-02-15
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned defects of pollutants that are not easy to separate, not easy to degrade and take too long, the purpose of the present invention is to provide a method for treating oil production wastewater with high pollutant separation efficiency and stronger biodegradability and its special reaction device

Method used

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  • Oil extraction waste water treatment method and its special reaction equipment
  • Oil extraction waste water treatment method and its special reaction equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] After oil separation and coagulation treatment, the oil production wastewater of an oil field contains COD221mg / L, BOD38mg / L, and mineral oil 31mg / L.

[0018] The processing steps of this embodiment are as follows:

[0019] (1) Oxidation treatment: Add the oil production wastewater into the reaction device from bottom to top, and feed ozone to make the ozone concentration in the reaction device reach 9.55mg / L; add ultrasonic waves at the same time, the frequency is 21kHz, and the sound intensity value is 0.6I 0 ; 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;

[0020] (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.

[0021] Such as figure 1 As shown, the special reaction device is mainly composed of water...

Embodiment 2

[0029] The difference from Example 1 is:

[0030] After oil separation and coagulation treatment, the oil production wastewater of an oilfield contains COD409mg / L, BOD47mg / L, and mineral oil 49mg / L.

[0031] The operation is as follows:

[0032] (1) Oxidation treatment: add oil recovery waste water to the reaction device from bottom to top, and then pass in ozone to make the ozone concentration in the reaction device reach 12.96mg / L; add ultrasonic waves at the same time, the frequency is 21kHz, and the sound intensity value is 0.7I 0 ; 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 12 minutes;

[0033] (2) carry out conventional coagulation treatment then: with embodiment 1;

[0034] (3) Conventional biochemical treatment: Activated sludge method is used for aerobic biochemical treatment, and the hydraulic retention time is 6 hours.

[0035] The results of wastewa...

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Abstract

A process and its special-purpose reactor for treating the waste water generated by recovering petroleum includes such steps as adding the waste water to the said reactor from top to bottom while adding ozone until its concentration reaches 5-20 mg / L, applying ultrasonic waves while stirring for 8-20 min, and coagulating. Its advantage is high separating efficiency of pollutants.

Description

technical field [0001] The invention relates to water treatment technology, in particular to a treatment method for oil production wastewater and a special reaction device thereof. 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 wastewater is poor, usually the BOD / COD value is not more than 0.2, and biochemical treatment is difficult (document 1: Tapan K. et al., Fate of Crude oil by the Combination of P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F1/78C02F1/36
Inventor 郭书海贾宏宇张海荣孙铁珩
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI