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Method and reagent for cleaning and repairing discarded reverse osmosis film in offline mode

A reverse osmosis membrane, off-line technology, applied in the direction of semi-permeable membrane separation, reverse osmosis, chemical instruments and methods, etc., to achieve the effects of enhanced membrane repair rate, high pertinence, and avoiding chemical damage

Active Publication Date: 2011-10-12
SICHUAN KELUN PHARMA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing technology does not involve the repair method of the damaged membrane, and the research here is still blank

Method used

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  • Method and reagent for cleaning and repairing discarded reverse osmosis film in offline mode
  • Method and reagent for cleaning and repairing discarded reverse osmosis film in offline mode
  • Method and reagent for cleaning and repairing discarded reverse osmosis film in offline mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The No. 25 waste reverse osmosis membrane produced by Nitto Denko Co., Ltd. is CPA3-8080 to analyze the membrane scale components. SEM), x diffractometer to identify the retentate sample, the crystal structure and morphology of membrane scale are as follows figure 1 . Characterize and analyze the scales formed in the waste reverse osmosis membrane, and confirm that the pollution type is silicate and / or carbonate; secondly, analyze and measure the membrane scales of different pollution types by three chemical methods, and obtain the Composition of the membrane scale of the reverse osmosis membrane; finally, when chemical analysis cannot be carried out, use the SDI instrument to test the color and density of the residue on the reverse osmosis membrane to judge the classification of the dirt. The white residue is silicon, sandy clay, and calcium scale ; The shape of the lens is inorganic colloid and calcium scale; finally, the analysis result of the membrane scale compos...

Embodiment 2

[0073] The No. 5 waste reverse osmosis membrane of BW30-400 produced by Dow Chemical Company is analyzed according to the method and steps of embodiment 1 for membrane scale composition analysis, first confirming that the pollution type is silicate and / or carbonate; The membrane scale of different pollution types is analyzed and measured by three chemical analysis methods, and the membrane scale composition of the waste reverse osmosis membrane is obtained; finally, when the chemical analysis cannot be carried out, the residue on the reverse osmosis membrane is tested by the SDI instrument. Color, density, judge the dirt classification, the white residue is silicon, sandy clay, calcium scale; the shape of the lens is calcium scale; finally, the analysis result of the membrane scale composition of the waste reverse osmosis membrane is that the main component of the membrane scale is SiO 2 , also contains illite, mica stone and plagiochlorite, mainly composed of Si, K, Ca, Mg, Al...

Embodiment 3

[0085] The No. 6 waste reverse osmosis membrane produced by Nitto Denko Co., Ltd., whose model is CPA3-8080, was analyzed according to the method and steps of Example 1, and the pollution type was confirmed to be silicate, carbonate and / or iron oxide. Second, through the analysis and determination of membrane scales of different pollution types through three chemical analysis methods, the membrane scale composition of waste reverse osmosis membranes can be obtained; finally, when chemical analysis cannot be carried out, use the SDI instrument to test reverse osmosis membranes The color and density of the residue on the surface are used to determine the classification of the dirt. The brown residue is iron dirt; the white residue is silicon, sandy clay, and calcium dirt; the shape of the lens is inorganic colloid and calcium dirt; Judging by the thick state, it also contains biological fouling or organic fouling. Finally, the analysis result of the membrane scale composition of ...

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Abstract

The invention discloses a method and reagent for cleaning and repairing a discarded reverse osmosis film in an offline mode, which are used for washing and repairing reverse osmosis film fouling of different types, solve the problem of non-thorough cleaning caused by the original crude cleaning mode, initiatively develop a repairing reagent and method of a damage film and fill domestic gaps in the aspect. Various parameters of the film obtained by cleaning and repairing with the method and the reagent approach those of a new film more closely, the film repair rate is greatly strengthened, the pertinence is higher, and the defect of chemically damaging a perfect film in the traditional cleaning method is avoided at the same time. The method and the reagent for cleaning and repairing the discarded reverse osmosis film in the offline mode can ensure that the performance of the washed film reaches or approaches that of the new film more closely, greatly reduce the film consumption cost of an enterprise, ensure non-interference of production and film cleaning and avoid the damage to a normal film during online chemical cleaning.

Description

technical field [0001] The invention relates to the field of electrochemical analysis, screening and formulating of chemical cleaning reagents, in particular to cleaning and repairing methods and reagents for waste reverse osmosis membranes in an off-line state. Background technique [0002] At present, reverse osmosis technology is used in the preparation of purified water in various fields (food, pharmaceuticals, electricity, tap water, etc.). The reverse osmosis membrane is the core of the reverse osmosis system, and its working performance directly affects the performance of the reverse osmosis system. [0003] After the reverse osmosis system runs for a period of time, insoluble bacteria layer, metal scale, silicon scale and other organic and inorganic pollutants will be formed on the surface of the membrane, resulting in an increase in the inlet pressure of the reverse osmosis system, a decrease in water production, and an increase in the conductivity of the product wat...

Claims

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Application Information

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IPC IPC(8): B01D65/06B01D65/10B01D61/10
CPCB01D61/10B01D65/02B01D65/025B01D2321/162B01D2321/164B01D2321/40
Inventor 文剑丹李维丽尹凤刚
Owner SICHUAN KELUN PHARMA CO LTD
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