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 problems such as inability to completely solve cleaning problems, cost waste, and poor cleaning effect of reverse osmosis membrane elements. , to achieve the effect of restoring water flux, easy availability of raw materials, and ensuring continuous and stable operation

Active Publication Date: 2012-07-11
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...

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 formulation used was:

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

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 formulation used was:

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

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PUM

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Abstract

The invention relates to a membrane cleaning agent for polyacrylamide on a reverse osmosis membrane. Acid chemical cleaning agents and alkaline chemical cleaning agents are prepared in the membrane cleaning agent, and the polyacrylamide and organic and inorganic pollutants wrapped by the polyacrylamide on the surface of the polluted reverse osmosis membrane are dissolved, dispersed, peeled and removed specifically. The membrane cleaning agent has the advantages of being easy to prepare and capable of recovering water producing flux and causing on damage to elements of the reverse osmosis membrane, and raw material can be achieved conveniently.

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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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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