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Fatlute reducing oil containing or polymer and oil containing sewage treatment method and degradable flocculation agent system

A treatment method and technology for oily sewage, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., to achieve great economic value, ecological benefits, and efficient oil removal.

Active Publication Date: 2016-12-14
CNOOC TIANJIN BRANCH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cationic agents bring serious sludge problems when treating oilfield wastewater

Method used

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  • Fatlute reducing oil containing or polymer and oil containing sewage treatment method and degradable flocculation agent system
  • Fatlute reducing oil containing or polymer and oil containing sewage treatment method and degradable flocculation agent system
  • Fatlute reducing oil containing or polymer and oil containing sewage treatment method and degradable flocculation agent system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1, degradable agent system treats oily sewage;

[0051] Oily sewage water samples were provided by Bohai Oilfield, with an oil concentration of 5000mg / L. Take 100mL of oily sewage at 20°C and pour it into a 100ml dehydration bottle, and keep warm at 65°C for 40min. Polyacryloxyethyltrimethylammonium chloride (molecular weight is 10 4-5 , cationic degree is 40%) polyethyleneimine (molecular weight 1200) is prepared into the aqueous solution that mass fraction is 1% respectively, according to flocculant dosage 250mg / L oily sewage, polyethyleneimine (molecular weight 1200) 50mg / L oily sewage Dosage: Add the above prepared aqueous solution to 100ml of sewage sample respectively, shake the dehydration bottle by hand 30 times, and let it stand for 2 minutes.

Embodiment 2

[0059] Embodiment 2, degradable agent system treatment of poly-containing oily sewage

[0060] The water samples of polymer-containing oily sewage are provided by Bohai Oilfield. The concentration of polymer-containing oily sewage is 150mg / L, and the concentration of oil is 5000mg / L. At 20°C, take the oily sewage containing polymers and pour it into a 2L dehydration bottle, and keep it warm at 65°C for 20 minutes. Polyacryloxyethyltrimethylammonium chloride mother liquor (molecular weight is 10 4-5 , cationic degree is 60%, mass concentration 40%) polyethyleneimine (molecular weight 1200, mass concentration 30%), according to the amount of flocculant 250mg / L, polyethyleneimine (molecular weight 1200) 50mg / L contains the amount of poly-sewage , add the above prepared aqueous solution to 2L of sewage samples respectively, 12 bottles as a group, shake the dehydration bottle by hand 30 times, and let it stand for 2 minutes.

Embodiment 3

[0066] Embodiment 3, degradable agent system treatment of poly-containing oily sewage

[0067] The water samples of polymer-containing oily sewage are provided by Bohai Oilfield. The concentration of polymer-containing oily sewage is 150mg / L, and the concentration of oil is 5000mg / L. At 20°C, take the oily sewage containing polymers and pour it into a 2L dehydration bottle, and keep it warm at 65°C for 20 minutes. Acryloyloxyethyltrimethylammonium chloride-allylamine copolymer (molecular weight is 10 4-5 , the cationic degree is 60%, the mass concentration is 50%), according to the amount of flocculant 250mg / L poly-oily sewage, the aqueous solution prepared above is added to 2L sewage sample, 12 bottles as a group, test 5 groups, shake off by hand After the water bottle is used 30 times, let it stand for 2 minutes.

[0068] The relationship between sludge residue (after oil removal) and the original weight ratio over time is: 10h-88%, 16h-76%, 24h-64%, 48h-53%, 96h-29%.

[...

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Abstract

The invention provides a fatlute reducing oil containing or polymer and oil containing sewage treatment method. The method comprises the steps that a degradable cationic flocculation agent is added into oil containing or polymer and oil containing sewage, and the degradable cationic flocculation agent is an acryloyloxyethyl trimethyl ammonium chloride polymer. The method further can comprise the steps that while or after the degradable cationic flocculation agent is added into the oil containing or polymer and oil containing sewage, a degradation promoter is added into the system. The degradation promoter is selected from one or more of organic amine, K2CO3 and ammonium persulfate. The mass ratio of the degradable cationic flocculation agent to the degradation promoter is 50:(0-50). The ratio of the total use amount of the degradable cationic flocculation agent and the degradation promoter to the oil containing or polymer and oil containing sewage can be 200 mg to 400 mg. The agent system can be used for fast and efficient oil removal of the sewage, the oil removal and solid removal efficiency of the agent is guaranteed, and meanwhile generated alum floc can be reduced by itself.

Description

technical field [0001] The invention belongs to the technical field of industrial sewage treatment, and in particular relates to a method for treating oily or polymer-containing oily sewage with sludge reduction and a degradable flocculation agent system. Background technique [0002] Oilfields will produce a large amount of oily sewage during the development and production process, and with the deepening of oilfield development and exploitation and the popularization and application of tertiary oil recovery technology (adding anionic polyacrylamide and other chemicals to the injection water to improve oil recovery), oily sewage The amount is increasing, the composition is more complex, and the processing difficulty is also greatly increased. Only physical oil removal technology (gravity sedimentation, inclined plate oil removal, cyclone air flotation, filtration, etc.) cannot effectively treat oilfield sewage to meet the discharge or reinjection underground standards. For ...

Claims

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Application Information

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IPC IPC(8): C02F1/56
CPCC02F1/56
Inventor 王秀军靖波翟磊张健胡科陈文娟
Owner CNOOC TIANJIN BRANCH
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