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Integrated treatment method for viscous oil wastewater

A technology of heavy oil wastewater and treatment method, applied in the field of water treatment, can solve the problems of large water quality fluctuation, large impurity content, unstable water quality of heavy oil wastewater, etc.

Inactive Publication Date: 2019-10-22
江苏悠谷未来科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main reasons for the difficult treatment of heavy oil sewage: (1) Various additives added in the oil recovery process make the sewage high in oil content, serious emulsification, complex components, and large fluctuations in water quality; (2) Heavy oil is a natural high viscosity, polymer Complex chemical substances are buried shallowly and are mostly stored in conglomerate. When mining, a large amount of mineral components must be carried out from the stratum. The water has high hardness and high impurity content, which further increases the difficulty of heavy oil sewage treatment; (3) Mining During the dehydration and sedimentation process of the effluent, a demulsifier is added, and a large amount of chemical agents remain in the sewage, so that the sewage forms a relatively stable emulsion. This sewage not only has a high oil content, but also has a strong stability of the emulsion; (4) The viscosity of heavy oil is high, which makes the degreasing and purification treatment of sewage more complicated and difficult; (5) Due to the change of heavy oil thermal recovery method and the increase of mining life, the water quality of heavy oil sewage becomes extremely unstable , which greatly affects the degreasing effect

Method used

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  • Integrated treatment method for viscous oil wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The first step is to send the heavy oil wastewater into the natural sedimentation tank to make the sediment in it settle;

[0033] In the 2nd step, add 200ppm polyether type demulsifier to the upper layer waste water that obtains in the 1st step and carry out demulsification treatment;

[0034] In the 3rd step, add Na to the waste water after demulsification obtained in the 2nd step 2 CO 3 And NaOH precipitates calcium and magnesium ions;

[0035] In the 4th step, 100 ppm polyaluminum chloride is added to the waste water obtained in the 3rd step for flocculation treatment, and after flocculation, sedimentation is carried out to remove the precipitate;

[0036] Step 5, perform wet oxidation treatment on the wastewater after flocculation and settlement, the temperature of wet oxidation is 160°C, the pressure is 2.5MPa, and the hydraulic retention time is 45min;

[0037] In the sixth step, the oxidized waste water is filtered with an ultrafiltration membrane, the molecu...

Embodiment 2

[0045] The first step is to send the heavy oil wastewater into the natural sedimentation tank to make the sediment in it settle;

[0046] In the 2nd step, add 500ppm polyether type demulsifier to the upper layer waste water that obtains in the 1st step and carry out demulsification treatment;

[0047] In the 3rd step, add Na to the waste water after demulsification obtained in the 2nd step 2 CO 3 And NaOH precipitates calcium and magnesium ions;

[0048] In the 4th step, 150 ppm polyaluminum chloride is added to the wastewater obtained in the 3rd step for flocculation treatment, and after flocculation, sedimentation is carried out to remove the precipitate;

[0049] The fifth step is to carry out wet oxidation treatment in the wastewater after flocculation and sedimentation. The temperature of wet oxidation is 180°C, the pressure is 3MPa, and the hydraulic retention time is 60min;

[0050] In the sixth step, the oxidized waste water is filtered with an ultrafiltration membr...

Embodiment 3

[0058] The first step is to send the heavy oil wastewater into the natural sedimentation tank to make the sediment in it settle;

[0059] In the 2nd step, add 400ppm polyether type demulsifier to the upper layer waste water obtained in the 1st step and carry out demulsification treatment;

[0060] In the 3rd step, add Na to the waste water after demulsification obtained in the 2nd step 2 CO 3 And NaOH precipitates calcium and magnesium ions;

[0061] In the 4th step, 120ppm polyaluminum chloride is added to the waste water obtained in the 3rd step for flocculation treatment, and after flocculation, sedimentation is carried out to remove the precipitate;

[0062] Step 5: Perform wet oxidation treatment on the wastewater after flocculation and sedimentation. The temperature of wet oxidation is 170°C, the pressure is 2.7MPa, and the hydraulic retention time is 50min;

[0063] In the sixth step, the oxidized waste water is filtered with an ultrafiltration membrane. The molecula...

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Abstract

The invention relates to an integrated treatment method for viscous oil wastewater, and belongs to the technical field of water treatment. The method mainly utilizes demulsification, sedimentation hardness-removal, flocculation, oxidation, ultrafiltration, adsorption and reverse osmosis treatments to achieve the comprehensive and stable running effect. The method has the advantages of cooperationof all units, stability in running, and good water discharge effect.

Description

technical field [0001] The invention relates to an integrated treatment method for heavy oil wastewater, belonging to the technical field of water treatment. Background technique [0002] In order to cooperate with the exploitation of domestic heavy oil and super heavy oil and improve the crude oil recovery rate, some oil fields have started to use steam-assisted gravity drainage (SAGD), and the resulting heavy oil sewage emulsion has become a problem that has troubled oilfield reinjection water quality. item problem. The complex composition of heavy oil sewage emulsion, small oil-water density difference, high viscosity, and serious emulsification state lead to long treatment process, large investment and high operating cost. At present, the demulsifiers used in heavy oil sewage emulsion mainly include epichlorohydrin-dimethylamine series high molecular cationic polymers, dimethyl diallyl ammonium chloride series high molecular cationic polymers, PAMAM and compounding ag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01J20/24B01J20/30
CPCB01J20/08B01J20/24C02F1/28C02F1/40C02F1/441C02F1/444C02F1/5236C02F1/72C02F9/00C02F2001/007
Inventor 王勇
Owner 江苏悠谷未来科技有限公司
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