Cleaning method of reverse osmosis membrane

A reverse osmosis membrane and reverse osmosis technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of low production efficiency and high cost, and achieve the effect of improving the desalination rate and the removal rate.

Inactive Publication Date: 2007-09-19
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

At present, there is no effective method for cleaning the reverse osmosis membrane. Generally, the reverse osmosis membrane is replaced after it has been used to a certain extent. The cost is high and the production efficiency is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The cleaning method of reverse osmosis membrane of the present invention, its preferred embodiment comprises,

[0028] Step 1. First, clean the reverse osmosis membrane with an alkaline cleaning agent;

[0029] Step 2, then, clean the reverse osmosis membrane with an acid cleaning agent;

[0030] Step 3. Finally, the reverse osmosis membrane is cleaned with a bactericide.

[0031] The present invention proposes a five-stage theory of the fouling process of the reverse osmosis membrane, which thinks that the fouling process of the reverse osmosis membrane is divided into five stages: (1) the roughening stage of the membrane surface by the inorganic matrix; (2) the formation stage of the initial organic matrix ; (3) the initial adhesion stage of microorganisms; (4) the growth and development stage of biofilm; (5) the irreversible blockage stage of membrane components.

[0032] According to this theory, and through repeated experiments, the method of cleaning the reverse...

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Abstract

The invention discloses a reverse osmosis membrane cleaning method, comprising the steps of cleaning the membrane by using alkaline cleaner, acidic cleaner, and sterilizing agent orderly, simultaneously, observing the decrease value of water yield under constant pressure and temperature, the increase value of net operation pressure at constant temperature and constant water yield, or the decrease value of water quality and desalinization ratio of modular system, to determine the occasion for cleaning reverse osmosis membrane. By using the method provided in the invention, the water yield and pressure difference of reverse osmosis membrane can be repaired to a great degree, the desalinization ratio after cleaning can be improved remarkably, and the removing ratios for TOC, CODMn, and UV254 can also be increased, thereby the method in the invention is simple, convenient, and efficient, and suitable for cleaning reverse osmosis membrane in water treatment process and other application field.

Description

technical field [0001] The invention relates to a reverse osmosis water treatment process, in particular to a method for cleaning a reverse osmosis membrane. Background technique [0002] Reverse osmosis is a reverse migration movement of osmosis. It is a separation method that separates the solute and the solvent in the solution by means of the selective interception of the reverse osmosis membrane under the pressure drive. It has been widely used in various liquids. Purification and concentration, especially in the water treatment process, using reverse osmosis technology to isolate industrial pollutants, heavy metals, bacteria, viruses and other impurities mixed into the water in large quantities, so as to meet the physical and chemical indicators and hygienic standards stipulated for drinking. Produces crystal clear to pure water. [0003] Under normal operating conditions of the reverse osmosis water treatment system, the reverse osmosis membrane may be polluted by ino...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D61/10
Inventor 何绪文王春荣李福勤
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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