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A method for on-line cleaning of reverse osmosis membrane elements based on composite fouling

A technology of reverse osmosis membrane and compound pollution, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as poor effect, and achieve the effect of prolonging cleaning cycle, saving cleaning and maintenance cost, and prolonging service life

Active Publication Date: 2021-11-09
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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  • A method for on-line cleaning of reverse osmosis membrane elements based on composite fouling
  • A method for on-line cleaning of reverse osmosis membrane elements based on composite fouling
  • A method for on-line cleaning of reverse osmosis membrane elements based on composite fouling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]A method for online cleaning of reverse osmosis membrane elements based on complex contamination.

[0029] Its technical scheme is: comprise the steps:

[0030] (1) The first sterilizing cleaning of the first-stage and second-stage reverse osmosis membrane elements: the first-stage and second-stage reverse osmosis membrane elements are cleaned with a sterilizing cleaning solution. The permeated water is washed to neutral, the cleaning flow rate is controlled at 4m³ / h / pressure vessel, and the cleaning pressure is controlled at 0.1Mpa; the sterilizing cleaning solution uses 500ppm aqueous solution of 2,2-bisbromo-3-nitrilopropionamide.

[0031] (2) Perform enhanced alkaline cleaning on a section of reverse osmosis membrane elements: use enhanced alkaline cleaning solution, first cycle for 1 hour for the first time, soak for the first time for 1 hour, then cycle for the second time for 1 hour, and soak for the second time After 1h, rinse with reverse osmosis water until ne...

Embodiment 2

[0038] A method for online cleaning of reverse osmosis membrane elements based on complex contamination.

[0039] Its technical scheme is: comprise the steps:

[0040] (1) The first sterilizing cleaning of the first-stage and second-stage reverse osmosis membrane elements: the first-stage and second-stage reverse osmosis membrane elements are cleaned with a sterilizing cleaning solution, and each stage is first circulated for 0.2h, then soaked for 0.2h, and then the reverse osmosis membrane elements are cleaned with sterilizing cleaning solution. The permeated water is washed to neutral, the cleaning flow rate is controlled at 6m³ / h / pressure vessel, and the cleaning pressure is controlled at 0.2Mpa; the sterilizing cleaning solution uses 800ppm aqueous solution of 2,2-bisbromo-3-nitrilopropionamide.

[0041] (2) Perform enhanced alkaline cleaning on a section of reverse osmosis membrane elements: use enhanced alkaline cleaning solution, first cycle for 1.5 hours for the first ...

Embodiment 3

[0048] A method for online cleaning of reverse osmosis membrane elements based on complex contamination.

[0049] Its technical scheme is: comprise the steps:

[0050] (1) The first sterilizing cleaning of the first-stage and second-stage reverse osmosis membrane elements: the first-stage and second-stage reverse osmosis membrane elements are cleaned with sterilizing cleaning solution, and each stage is first circulated for 0.6h, then soaked for 0.6h, and then reverse The permeated water is washed to neutral, the cleaning flow rate is controlled at 9m³ / h / pressure vessel, and the cleaning pressure is controlled at 0.3Mpa; the sterilizing cleaning solution uses 1500ppm aqueous solution of 2,2-bisbromo-3-nitrilopropionamide.

[0051] (2) Perform enhanced alkaline cleaning on a section of reverse osmosis membrane elements: use enhanced alkaline cleaning solution, first cycle for 2.5 hours for the first time, soak for 2.5 hours for the first time, then cycle for the second time for...

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Abstract

The invention relates to the technical field of industrial reverse osmosis membrane elements, and discloses an online cleaning method for reverse osmosis membrane elements based on composite pollution, including six major steps: (1) Sterilizing the first-stage and second-stage reverse osmosis membrane elements for the first time Cleaning; (2) Enhanced alkaline cleaning of the first stage of reverse osmosis membrane elements; (3) Enhanced acid cleaning of the first stage of reverse osmosis membrane elements; (4) Weakened acid cleaning of the second stage of reverse osmosis membrane elements; (5) The second-stage reverse osmosis membrane elements are subjected to weakened alkaline cleaning; (6) The first-stage and second-stage reverse osmosis membrane elements are subjected to a second sterilizing cleaning. The present invention designs a special cleaning method for reverse osmosis membrane elements polluted by aluminum-iron salts, inorganic colloids and biological complexes, so that the cleaning effect of reverse osmosis membrane elements can be recovered well, the system performance decay rate is low after cleaning, and the cleaning period and The service life of the membrane element is extended, and the cost of cleaning and maintenance is saved.

Description

technical field [0001] The invention relates to the technical field of industrial reverse osmosis membrane elements, in particular to an on-line cleaning method based on compound-polluted reverse osmosis membrane elements. Background technique [0002] Due to various reasons, in the practical application of reverse osmosis membrane separation technology, the phenomenon of membrane fouling can be avoided, and the problem of membrane fouling is the decisive factor affecting the stability of the technology. Fouling also causes the operating cost of some systems to remain high one of the reasons. The control of reverse osmosis membrane fouling generally focuses on pre-treatment, but experience shows that only pre-treatment in existing reverse osmosis water treatment is often not enough; Gradually, the deposition of various pollutants causes membrane fouling, and reverse osmosis (RO) technology is largely affected by membrane fouling economically; in fact, the reliability of the...

Claims

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Application Information

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Patent Type & Authority Patents(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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