Cleaning method of ultrafiltration membrane used in membrane-process polymer-flooding oilfield wastewater treatment

A technology of oil production wastewater and ultrafiltration membrane, which is applied in the field of membrane cleaning, and can solve the problems of general cleaning effect of polymer pollution, poor pertinence, limited cleaning steps and cleaning methods, etc.

Active Publication Date: 2016-11-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned conventional chemical cleaning agents are universal, they are not very specific, and the cleaning effect on polymer pollution is average.
Moreover, the research on cleaning steps and cleaning methods in the prior art is also relatively limited.

Method used

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  • Cleaning method of ultrafiltration membrane used in membrane-process polymer-flooding oilfield wastewater treatment
  • Cleaning method of ultrafiltration membrane used in membrane-process polymer-flooding oilfield wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Process conditions:

[0066] Contaminated membrane: Ultrafiltration treatment of ultrafiltration polluted membrane in polymer flooding wastewater in Daqing Oilfield;

[0067] Cleaning temperature: 40°C;

[0068] Cleaning method: static soaking;

[0069] Cleaning time: each step is different;

[0070] Preparation of cleaning solution: use water as solvent;

[0071] (i) Hydrochloric acid lotion of sodium hydrogen fluoride: the molar concentration of sodium hydrogen fluoride is 0.05 moles per liter; Regulate pH=2.0 with hydrochloric acid; Cleaning time is 180 minutes;

[0072] (ii) Oxidant lotion: sodium hypochlorite volume concentration is 0.2%; Regulate pH=10 with sodium hydroxide; Cleaning time is 60 minutes;

[0073] (iii) Surfactant lotion: the molar concentration of anionic surfactant (sodium dodecylbenzenesulfonate) is 4.0CMC (critical micelle concentration), nonionic surfactant (OP-10, purchased from Sinopharm Group) concentration is 2.0CMC; Regulate pH=12 wit...

Embodiment 2

[0080] Process conditions:

[0081] Contaminated membrane: Ultrafiltration treatment of ultrafiltration polluted membrane in polymer flooding wastewater in Daqing Oilfield;

[0082] Cleaning temperature: room temperature;

[0083] Cleaning method: 0.3MPa cycle pressure cleaning;

[0084] Cleaning time: each step is different;

[0085] Preparation of cleaning solution: use water as solvent;

[0086] (i) Hydrochloric acid lotion of sodium hydrogen fluoride: the molar concentration of sodium hydrogen fluoride is 0.05 moles per liter; Regulate pH=2.0 with hydrochloric acid; Cleaning time is 180 minutes;

[0087] (ii) mixed lotion of oxidizing agent and tensio-active agent: sodium hypochlorite volume concentration is 0.2%; Anionic surfactant (sodium dodecylbenzene sulfonate) concentration is 0.2CMC; Regulate pH=12 with sodium hydroxide; Cleaning time is 120 minutes;

[0088](iii) Sodium bifluoride and nitric acid, hydrochloric acid washing solution: the molar concentration of ...

Embodiment 3

[0094] Process conditions:

[0095] Contaminated membrane: ultrafiltration membrane polluted by pure polyacrylamide;

[0096] Cleaning temperature: room temperature;

[0097] Cleaning method: static soaking;

[0098] Cleaning time: 120 minutes;

[0099] Preparation of cleaning solution: use water as solvent;

[0100] (i) Alkali lotion of oxidant and disodium edetate: the volume concentration of sodium hypochlorite is 0.15%; the molar concentration of disodium edetate is 5.0mM; adjust pH=11.0 with sodium hydroxide;

[0101] (ii) Alkali lotion of oxidizing agent and tensio-active agent: the volume concentration of sodium hypochlorite is 0.05%; The molar concentration of cationic surfactant (dodecyltrimethylammonium chloride) is 4.0CMC; Regulate pH with sodium hydroxide = 11.0;

[0102] (iii) Hydrochloric acid washing solution: hydrochloric acid, pH=4.0.

[0103] Cleaning steps:

[0104] Physical cleaning first: wash the polluted membrane surface with clean water and backw...

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Abstract

The invention provides a cleaning method of an ultra-filtration membrane used in membrane-process polymer-flooding oilfield wastewater treatment. The cleaning method comprises the steps of (1) physical cleaning and chemical cleaning, wherein chemical cleaning comprises the following steps: (2) cleaning with a pickling solution; (3) cleaning with a sodium hydrogenfluoride and alkaline mixed solution, a sodium hydrogenfluoride and acid mixed solution or a sodium hydrogenfluoride and sodium fluoride mixed solution; (4) cleaning with an oxidizing agent lotion; (5) cleaning with a membrane cleaning additive; (6) cleaning with a surfactant or an organic solvent cleaning agent.

Description

technical field [0001] The invention relates to membrane cleaning technology, in particular to a membrane cleaning technology in the membrane treatment process of wastewater containing polymeric pollutants, which is suitable for membrane treatment of oil production wastewater such as polymer flooding and three-way flooding, and is also suitable for other industrial wastewater and landfill leachate , Membrane treatment of domestic sewage, seawater desalination, and drinking water containing extracellular and extracellular polymers. Background technique [0002] Various technologies, including physical, chemical, biological and membrane separation techniques, are used for water treatment, recovery and reuse. Among them, membrane separation technology has the advantages of good treatment effect, low energy consumption, small footprint and no addition of chemical substances, and is more and more widely used in the field of water treatment. However, membrane fouling is still the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06C02F1/44C02F103/10
CPCB01D65/02B01D2321/162B01D2321/164B01D2321/168C02F1/444C02F2103/10C02F2303/16
Inventor 于水利刘贵彩赵东升
Owner TONGJI UNIV
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