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A treatment method for high oil and poly-containing sewage

A treatment method and technology for sewage, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., to achieve the effect of reducing quantity and intensity

Active Publication Date: 2018-05-08
CHINA NAT OFFSHORE OIL CORP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that for the treatment of highly oily and polymer-containing sewage, the treatment of complex emulsified oil in the microscopic oil phase region and oil-in-water emulsified oil in the water phase region is very important, and there is no report on this aspect so far.

Method used

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  • A treatment method for high oil and poly-containing sewage
  • A treatment method for high oil and poly-containing sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take 100mL of oil field site poly-containing sewage, and place it in a 65°C water bath for half an hour at a constant temperature, and the following treatment temperatures are 65°C. Add 20mg / L of cationic polyether type quaternary ammonium salt, artificially shake for 1min, then add 150mg / L of weak cationic polyacrylamide / polyoxyethylene-polyoxypropylene-polyoxyethylene block polyether compound water purifier (mass Ratio is 2:1), after artificial shaking for 1min, observe the water color and flocs, and measure the oil content and turbidity of the sewage.

Embodiment 2

[0045] Take 100mL of oil field site poly-containing sewage, and place it in a 65°C water bath for half an hour at a constant temperature, and the following treatment temperatures are 65°C. Add 30mg / L cationic polyether type quaternary ammonium salt, mechanically shake for 1min, then add 100mg / L weak cationic polydimethyldiallylammonium chloride / polyoxyethylene-polyoxypropylene-polyoxyethylene block Polyether compound water purifying agent (mass ratio 3:1), observe water color and flocs after mechanical shaking for 1 min, and measure oil content and turbidity of sewage.

Embodiment 3

[0047] Take 100mL of oil field site poly-containing sewage, and place it in a 65°C water bath for half an hour at a constant temperature, and the following treatment temperatures are 65°C. Add 50mg / L cationic polyether type quaternary ammonium salt, artificially shake for 2min, then add 80mg / L weak cationic polydimethyldiallylammonium chloride / polyoxypropylene-polyoxyethylene copolymer compound water purifier (Mass ratio is 4:1), artificially shake for 1min to observe the water color and flocs, and measure the oil content and turbidity of the sewage.

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Abstract

The invention discloses a method for treating high oil content polymer-bearing wastewater, which comprises the steps: (1) a reverse-phase demulsifier is added into the high oil content polymer-bearing wastewater, and uniform mixing is conducted; (2) a weak cation type / non-ion-type compound water cleaning agent is added into the wastewater treated in the step (1), uniform mixing is conducted to achieve purification of the polymer-bearing wastewater, and the weak cation type / non-ion-type compound water cleaning agent comprises a weak cation type water cleaning agent and a non-ion-type water cleaning agent. The method for treating the high oil content polymer-bearing wastewater achieves effective removal of conventional emulsified oil and complex emulsified oil in the high oil content polymer-bearing wastewater, gives full play to the effect of the reverse-phase demulsifier and the water cleaning agent, and achieves synergistic interaction of functions. The method for treating the high oil content polymer-bearing wastewater has the advantages that (1) the water cleaning and oil removal effect is better than the effect obtained when the reverse-phase demulsifier and the water cleaning agent are separately used; (2) the usage amount of the agents is greatly reduced than a single water cleaning agent; (3) the high oil content polymer-bearing wastewater can be effectively treated; and (4) the method for treating the high oil content polymer-bearing wastewater does not change an original sewage treatment process, and is excellent in adaptation with field technology.

Description

technical field [0001] The invention relates to a treatment method for highly oily and poly-containing sewage, which belongs to the field of petroleum. Background technique [0002] With the popularization and application of polymer flooding technology in major oilfields in my country, the processing capacity of polymer flooding production fluid is increasing, and the concentration of polymer produced is also increasing, which brings continuous difficulties in sewage treatment. increase. At present, the oil displacement polymer used in the oil field is mainly anionic polyacrylamide, which is injected into the ground and sheared and hydrolyzed to become a highly hydrolyzed and strongly electronegative polymer with a molecular weight of 100,000 to one million. These residual anionic polymers have a great impact on the properties and composition of sewage: on the one hand, the viscosity of sewage is increased, and it increases significantly with the increase of the output polym...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/10
CPCC02F1/40C02F1/56C02F2103/10
Inventor 翟磊王秀军靖波檀国荣张健
Owner CHINA NAT OFFSHORE OIL CORP
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