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Online cleaning method for reverse osmosis membrane element based on combined pollution

A reverse osmosis membrane and complex pollution technology, which is applied in the direction of reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc., can solve the problems of poor effect, extend the cleaning cycle, improve the cleaning recovery effect, and reduce the system performance attenuation rate Effect

Active Publication Date: 2021-02-09
中芯膜(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for reverse osmosis (RO) membrane systems fouled by aluminum-iron salts (PAC), inorganic colloids, and biological complexes, conventional cleaning methods are less effective

Method used

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  • Online cleaning method for reverse osmosis membrane element based on combined pollution
  • Online cleaning method for reverse osmosis membrane element based on combined pollution
  • Online cleaning method for reverse osmosis membrane element based on combined pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]An online cleaning method for reverse osmosis membrane elements based on compound pollution.

[0029]The technical solution is: including the following steps:

[0030](1) Perform the first sterilization and cleaning of the first and second-stage reverse osmosis membrane elements: the first and second-stage reverse osmosis membrane elements are all cleaned with sterilizing cleaning fluid, and each stage is cycled for 0.1h, then soaked for 0.1h, and then used for reverse osmosis. The permeating product water is flushed to neutrality, the cleaning flow is controlled at 4m³ / h / pressure vessel, and the cleaning pressure is controlled at 0.1Mpa; the sterilization cleaning liquid uses 2,2-bisbromo-3-nitrilopropionamide 500ppm aqueous solution.

[0031](2) Intensified alkaline cleaning of a section of reverse osmosis membrane element: using an intensified alkaline cleaning solution, first cycle for 1h, first soak for 1h, and then perform second cycle for 1h and second soak in sequence After 1h,...

Embodiment 2

[0038]An online cleaning method for reverse osmosis membrane elements based on compound pollution.

[0039]The technical solution is: including the following steps:

[0040](1) Carry out the first sterilization and cleaning of the first and second-stage reverse osmosis membrane elements: the first and second-stage reverse osmosis membrane elements are both cleaned with sterilizing cleaning fluid, and each stage is cycled for 0.2h, then soaked for 0.2h, and then used for reverse osmosis. The permeate product water is flushed to neutrality, the cleaning flow is controlled at 6m³ / h / pressure vessel, and the cleaning pressure is controlled at 0.2Mpa; the sterilization cleaning liquid uses 800ppm aqueous solution of 2,2-bisbromo-3-nitrilopropionamide.

[0041](2) Intensified alkaline cleaning of a section of reverse osmosis membrane elements: using an intensified alkaline cleaning solution, the first cycle of 1.5h, the first immersion for 1.5h, and the second cycle of 1.5h, the first Secondly soak...

Embodiment 3

[0048]An online cleaning method for reverse osmosis membrane elements based on compound pollution.

[0049]The technical solution is: including the following steps:

[0050](1) Carry out the first sterilization and cleaning of the first and second-stage reverse osmosis membrane elements: the first and second-stage reverse osmosis membrane elements are both cleaned with sterilizing cleaning fluid, and each stage is cycled for 0.6h, then soaked for 0.6h, and then used for reverse osmosis. The permeate product water is flushed to neutral, the cleaning flow is controlled at 9m³ / h / pressure vessel, and the cleaning pressure is controlled at 0.3Mpa; the sterilization cleaning liquid uses 2,2-bisbromo-3-nitrilopropionamide 1500ppm aqueous solution.

[0051](2) Intensified alkaline cleaning of a section of reverse osmosis membrane elements: using an enhanced alkaline cleaning solution, the first cycle of 2.5h, the first immersion for 2.5h, and then the second cycle of 2.5h, the first Secondly soak fo...

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Abstract

The invention relates to the technical field of industrial reverse osmosis membrane elements, and discloses a combined pollution-based reverse osmosis membrane element on-line cleaning method, and themethod comprises the following six steps: (1) carrying out primary sterilization cleaning on a first-section reverse osmosis membrane element and a second-section reverse osmosis membrane element; (2) performing enhanced alkaline cleaning on the first-section reverse osmosis membrane element; (3) carrying out enhanced acidic cleaning on the first-section reverse osmosis membrane element; (4) performing weakly acidic cleaning on the second-stage reverse osmosis membrane element; (5) performing weakening alkaline cleaning on the second-section reverse osmosis membrane element; (6) carrying outsecondary sterilization and cleaning on the first-section reverse osmosis membrane element and the second-section reverse osmosis membrane element. A special cleaning mode is designed for the reverseosmosis membrane element subjected to combined pollution of aluminum iron salt, inorganic colloid and organisms, so that the cleaning effect of the reverse osmosis membrane element is recovered well,the performance attenuation rate of the system after cleaning is low, the cleaning period is prolonged, the service life of the membrane element is prolonged, and the cleaning and maintenance cost issaved.

Description

Technical field[0001]The invention relates to the technical field of industrial reverse osmosis membrane elements, in particular to an online cleaning method for reverse osmosis membrane elements based on compound pollution.Background technique[0002]Due to various reasons, in the actual application of reverse osmosis membrane separation technology, membrane fouling can be avoided, and membrane fouling is a decisive factor affecting the stability of the technology. Fouling is also a cause of high operating costs for certain systems. One of the reasons. The control of reverse osmosis membrane pollution generally focuses on the pre-pretreatment, but experience shows that the existing reverse osmosis water treatment only pretreatment is often not enough; no matter how perfect the pretreatment is, how strict the daily operation is, the surface of the membrane will be affected during long-term operation. The deposition of various pollutants gradually causes membrane fouling, and reverse o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D61/02
CPCB01D61/025B01D65/02B01D65/022
Inventor 王双许家旺王美李海玲
Owner 中芯膜(北京)科技有限公司
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