Membrane cleaning agent for cleaning reverse osmosis membrane and application method

A membrane cleaning agent and technology for reverse osmosis membranes, which are used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of inability to completely solve cleaning problems, poor cleaning effect of reverse osmosis membrane elements, and waste of cost. , to achieve the effect of restoring water flux, ensuring continuous and stable operation, and easy availability of raw materials

Active Publication Date: 2014-07-23
蓝星工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the conventional cleaning agent is suitable for cleaning the generally polluted membrane elements, the cleaning effect on the reverse osmosis membrane elements polluted by polyacrylamide is not good, and it can no longer completely solve the cleaning problem of such pollutants, resulting in the system having to be replaced with a new one. Membrane elements, causing unnecessary waste of cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Toray reverse osmosis membrane element TML20-370 was selected as the experimental membrane. Under the condition of water temperature of 25°C, sodium chloride and pure water were used to prepare a salt solution with a total salt content of 2000mg / L as the raw water, and the influent water was controlled. The pressure is 1.5 MPa, the influent flow rate is 10t / h, when the membrane element is in normal operation, the concentrated water pressure is 1.4 MPa, the product water is 1.5t / h, and the salt content of the product water is 6mg / L. Anionic polyacrylamide (molecular weight 12 million, Taihe Water Treatment Co., Ltd.) was added to the raw water with a concentration of 10 mg / L. After running for 2 hours, the inlet water pressure was 1.5 MPa, the inlet water flow rate was 8t / h, and the concentrated water pressure was 1.1 MPa. The water is 0.6t / h, and the salt content of the product water is 35mg / L. The parameter changes indicate that the membrane has been polluted, and the s...

Embodiment 2

[0031] Toray reverse osmosis membrane element TML20-370 was selected as the experimental membrane. Under the condition of water temperature of 25°C, an aqueous solution with calcium chloride and sodium carbonate concentrations of 10ppm was prepared with pure water, and sodium chloride was added to the solution. Make the total salt content of the solution be 2000mg / L. Use this solution as raw water, add anionic polyacrylamide (molecular weight 12 million, Taihe Water Treatment Co., Ltd.) h, the concentrated water pressure is 0.9 MPa, the product water is 0.53t / h, and the salt content of the product water is 42mg / L. The parameter changes indicate that the membrane has been polluted, and the desalination rate has slightly decreased, and the product water flux has decreased by 65%.

[0032] Take the above-mentioned membrane element polluted by polyacrylamide for cleaning operation.

[0033] The membrane cleaner formula used was:

[0034] Acid cleaning agent: This type of cleanin...

Embodiment 3

[0038] Toray reverse osmosis membrane element TML20-370 was selected as the experimental membrane. Under the condition of water temperature of 25°C, an aqueous solution with calcium chloride and sodium carbonate concentrations of 10ppm was prepared with pure water, and sodium chloride was added to the solution. Make the total salt content of the solution be 2000mg / L. Use this solution as raw water, add anionic polyacrylamide (molecular weight 12 million, Taihe Water Treatment Co., Ltd.) h, the concentrated water pressure is 0.9 MPa, the product water is 0.54t / h, and the salt content of the product water is 48mg / L. The parameter changes indicate that the membrane has been polluted, and the desalination rate has slightly decreased, and the product water flux has decreased by 64%.

[0039] Take the above-mentioned membrane element polluted by polyacrylamide for cleaning operation.

[0040] The membrane cleaner formula used was:

[0041] Acid cleaning agent: This type of cleanin...

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PUM

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Abstract

The invention relates to a membrane cleaning agent for polyacrylamide pollutants on reverse osmosis membranes. In the present invention, two types of chemical cleaning agents, acidic and alkaline, are prepared, and the polyacrylamide and the organic and inorganic pollutants wrapped on the surface of the polluted reverse osmosis membrane can be dissolved, dispersed, stripped and removed in a targeted manner. The invention has the characteristics of simple preparation of the cleaning agent, convenient and easy-to-obtain raw materials, quick restoration of the water production flux of the reverse osmosis membrane, no damage to the reverse osmosis membrane element, and the like.

Description

technical field [0001] The invention relates to a reverse osmosis membrane cleaning agent, in particular to a membrane cleaning agent used for polyacrylamide pollutants on the reverse osmosis membrane. Background technique [0002] At present, the reverse osmosis membrane water treatment process is one of the main methods for the advanced treatment and reuse of sewage. Due to the characteristics of poor water quality, complex water quality, high content of colloid, bacteria and algae in the process water and cooling circulating water in the chemical, petrochemical, and iron and steel industries, it is easy to cause fouling to the reverse osmosis system. The reverse osmosis membrane that is fouled after being polluted will fail, which will cause the pressure difference of the membrane element to increase during operation, the salt rejection rate and flow rate will decrease, and even fail to work normally. [0003] Polyacrylamide is a kind of macromolecular compound. As a flo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/06
Inventor 郭春禹李江海龙洋吉春红郑东晟赵雪娜杨慧敏郭嘉朱东华王晓琴
Owner 蓝星工程有限公司
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