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Cleaning method of reverse osmosis membrane

A reverse osmosis membrane and cleaning agent technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem that chemical cleaning formulas and cleaning methods are not highly targeted, cannot meet the requirements of membrane cleaning, and have poor cleaning effects To solve the problems such as good or bad, to achieve the effect of easy control of the cleaning operation process, recovery of permeate flux, and continuous and stable operation

Inactive Publication Date: 2012-07-04
蓝星工程有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The cleaning effect of conventional on-line cleaning is not good, and the membrane fouling problem can no longer be completely solved, resulting in the system having to be replaced with new membrane elements, resulting in unnecessary waste of cost
However, the chemical cleaning formulas and cleaning methods in the existing off-line cleaning technology are not very targeted. Although they are suitable for the cleaning of generally polluted membrane elements, they are often powerless and cannot meet the requirements of some special or seriously polluted membrane elements. Membrane Cleaning Requirements After Formation of Polyacrylamide Contaminants

Method used

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Experimental program
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Effect test

Embodiment 1

[0029] 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 10mg / L. After 2 hours of operation, the inlet water pressure was 1.5 MPa, the inlet water flow rate was 8t / h, and the concentrated water pressure was 1.1MPa. The water is 0.6t / h, and the salt content of the product water is 39mg / L. The parameter changes indicate that the membrane has been polluted, and the sa...

Embodiment 2

[0040] 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 45mg / 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%.

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Abstract

The invention relates to a cleaning method of a reverse osmosis membrane. By aiming at reverse osmosis membrane elements polluted by polyacrylamide, chemical agents and cleaning devices are used for realizing various cleaning modes of continuous cleaning and intermittent cleaning, positive cleaning and opposite cleaning, acidic cleaning agent and alkaline cleaning agent alternate using, and the pure water forward osmosis flushing. The cleaning method has the characteristics that the cleaning agent preparation is simple, the cleaning operation process is easy to control, the cleaning condition is mild, the reverse osmosis membrane element is not damaged, the performance of the reverse osmosis membrane is efficiently recovered, and the like.

Description

technical field [0001] The invention relates to a cleaning method for a 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 flocculant commonly used in sewage treatment, it can produce better flocculation. Before the reverse osmos...

Claims

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Application Information

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IPC IPC(8): B01D65/06B01D61/10C02F1/44
Inventor 李江郭春禹吉春红郑东晟海龙洋杨慧敏赵雪娜郭嘉朱东华杨昆王晓琴
Owner 蓝星工程有限公司
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