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Enhanced cleaning method for reverse osmosis/nanofiltration membrane pollution

A technology of nanofiltration membrane and reverse osmosis, which is applied in the field of enhanced cleaning of membrane fouling, to achieve the effect of simple cleaning process, improved cleaning effect, and improved membrane separation efficiency

Inactive Publication Date: 2013-04-03
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies in the existing membrane pollution cleaning technology, the present invention proposes a new enhanced cleaning method for reverse osmosis / nanofiltration membrane pollution, which can effectively improve the cleaning efficiency of the existing reverse osmosis / nanofiltration membrane pollution

Method used

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  • Enhanced cleaning method for reverse osmosis/nanofiltration membrane pollution

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Embodiment Construction

[0046] The implementation of the present invention is described in detail below:

[0047] Contaminated reverse osmosis / nanofiltration membrane cyclic soaking solution containing pH-sensitive functional materials: prepare an aqueous solution containing pH-sensitive functional materials with a concentration of 10-500mg / L, and conduct cyclic soaking treatment on the polluted membrane at room temperature for 10-120 minutes ; If the pH-sensitive functional material is polyacrylic acid and its water-soluble copolymer, or polymethacrylic acid and its water-soluble copolymer, or water-soluble carboxymethyl cellulose, then the pH of the solution is adjusted to be alkaline (pH at 7.5 -11.0), so that the pH-sensitive polymer molecules are elongated and stretched in the aqueous solution; if the pH-sensitive functional material is water-soluble chitosan, the pH of the solution is adjusted to be acidic (pH between 1.0-6.5) Between), the pH-sensitive polymer molecules are elongated and stret...

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Abstract

The invention relates to an enhanced cleaning method for membrane pollution, in particular to an enhanced cleaning method for reverse osmosis / nanofiltration membrane pollution. The enhanced cleaning method for reverse osmosis / nanofiltration membrane pollution, provided by the invention, is characterized by comprising the following steps of: introducing a functional material with pH response characteristics in the reverse osmosis / nanofiltration membrane pollution cleaning process, and enabling the functional material with pH response characteristics to enter a pollution layer under the action of diffusion; and then enabling the functional material with pH response characteristics in a membrane surface pollution layer to have molecule configuration conversion through changing the pH value of a solution, thereby enabling the pollution layer to be loosen, promoting pollutants to be removed from the membrane surface, and increasing the cleaning efficiency of membrane pollution. The invention has the advantages that the cleaning effect on reverse osmosis / nanofiltration membrane pollution can be effectively enhanced, thereby increasing the membrane separating efficiency and prolonging the service life of membranes; and in addition, the cleaning process is simpler. The enhanced cleaning method for reverse osmosis / nanofiltration membrane pollution, provided by the invention, has wide application range.

Description

technical field [0001] The invention relates to an enhanced cleaning method for membrane pollution, in particular to an enhanced cleaning method for reverse osmosis / nanofiltration membrane pollution. technical background [0002] Membrane separation technology is a new green separation technology with high efficiency and energy saving. It has the outstanding characteristics of simple equipment, mild operating conditions, large processing capacity and high separation efficiency. Separation, environmental engineering, food, medicine and other fields have been widely used, and have achieved good economic and social benefits; Water reuse, clean production, drinking water purification and other fields have been more widely used and valued. [0003] The core and foundation of membrane separation technology is a high-performance separation membrane. During the use of the separation membrane, impurities in the solution will be trapped on the surface of the membrane, thereby forming...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/06
Inventor 俞三传刘梅红
Owner ZHEJIANG SCI-TECH UNIV
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