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Cleaning technology suitable for processing oil recovery waste water polytetrafluoroethylene film

A technology of polytetrafluoroethylene membrane and oil production wastewater, which is applied in the field of membrane cleaning, can solve the problems such as the inapplicability of polytetrafluoroethylene membrane, and achieve the effects of strong pertinence, shortened cleaning time and low energy consumption

Inactive Publication Date: 2015-04-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is aimed at the cleaning method of ceramic membranes used in oil field wastewater, and is not suitable for PTFE membranes.

Method used

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  • Cleaning technology suitable for processing oil recovery waste water polytetrafluoroethylene film
  • Cleaning technology suitable for processing oil recovery waste water polytetrafluoroethylene film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A cleaning process suitable for treating tertiary oil recovery waste water polytetrafluoroethylene flat membrane, the process is: wash with tap water for 0.5h; add 0.2wt.% sodium hypochlorite to 0.5wt.% sodium hydroxide solution as alkali washing solution to clean 0.5h, soaking 1h; petroleum ether cleaning 0.3h, soaking 1h; 3wt.% hydrochloric acid cleaning 0.5h, soaking 2h, the whole cleaning process is over, the flux recovery rate reaches 99.3%.

Embodiment 2

[0030] A polytetrafluoroethylene hollow fiber membrane cleaning process suitable for treating tertiary oil recovery wastewater. The process is to use weakly alkaline water for 0.5h; add 0.5wt.% sodium hypochlorite to 1wt.% sodium hydroxide solution as an alkali washing solution Wash for 1 hour, soak for 3 hours; carbon tetrachloride for 0.5 hours, soak for 0.5 hours; 0.5wt.% citric acid for 0.5 hours, soak for 5 hours, the whole cleaning process is over, and the flux recovery rate reaches 98.7%.

Embodiment 3

[0032] A polytetrafluoroethylene flat membrane cleaning process suitable for treating primary oil production wastewater. The process is to use tap water to clean for 1 hour; add 5wt.% sodium peroxide to 3wt.% sodium hydroxide solution as an alkaline wash for 0.5 hours, Soak for 2 hours; wash with petroleum ether for 0.3 hours, soak for 0.5 hours; wash with 5wt.% oxalic acid for 0.5 hours, soak for 5 hours, the whole cleaning process is over, and the flux recovery rate reaches 98.2%.

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Abstract

The invention discloses a cleaning technology suitable for processing an oil recovery waste water polytetrafluoroethylene film, and belongs to the technical field of film cleaning. The cleaning technology comprises the following steps: (1) cleaning the film for 0.5-1 h with water; (2) adding an oxidant or a surfactant in sodium hydroxide solution as alkali cleaning solution to clean the film for 0.5-1 h; soaking the film for 0.5-5 h; soaking the film in water for 0.5-1 h; (3) cleaning the film with an organic solvent for 0.3-0.5h; soaking the film for 0.5-1 h; (4) cleaning the film with acidic cleaning solution for 0.5-1 h; soaking the film for 0.5-5 h; soaking the film in water for 0.5-1 h; ending the whole cleaning process. The technology is high in cleaning efficiency of the film, can effectively clean out organic matters, inorganic matters and microbes on the surface of the film and in the film openings; clear water flux restoring rate can reach above 98%; the technology is high in detersive efficiency and pertinence, economical, and high in energy conservation.

Description

technical field [0001] The invention belongs to the technical field of membrane cleaning and relates to a cleaning process for a polytetrafluoroethylene flat membrane suitable for treating oil production wastewater. Background technique [0002] In the process of oil extraction, a large amount of oily wastewater will be produced. These oily wastewater affects the quality of drinking water and surface water, leading to air pollution and crop yield reduction, and even threaten human health. Therefore, it is very necessary and meaningful to effectively treat oily wastewater. Sewage treatment methods generally include flocculation, flotation, electrocoagulation, membrane separation and biological methods. Among them, the membrane treatment method has been widely used because of its low energy consumption, high efficiency, low pollution and simple process. Petroleum wastewater contains a large amount of oil, polyacrylamide and other organic matter, inorganic matter and microorg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02
Inventor 于水利张冰时文歆朱友兵
Owner HARBIN INST OF TECH
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