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Preparation method of high-performance reverse-osmosis anti-pollution film

A reverse osmosis and anti-pollution technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as increased system operating costs, poor water quality, and decreased membrane flux, and achieve good water quality. Flux and rejection rate, good anti-pollution performance, low cost of preparation

Active Publication Date: 2016-05-11
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Membrane fouling is generally manifested as the flux of the membrane decreases and the quality of the produced water deteriorates after the system has been running for a period of time.
Once membrane fouling occurs, in order to ensure the water production of the system, it is necessary to increase the driving pressure and carry out frequent backwashing, which not only increases the operating cost of the system, but also uses strong acid and strong alkali backwashing process to damage the membrane performance. Restoration process, which shortens membrane life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 0.1% polyethyleneimine to 1% glycerin aqueous solution, mix evenly, and apply it on the reverse osmosis basement membrane. After 20 seconds, pour off the excess solution and dry it in the shade. The aqueous solution of glutaraldehyde was coated on the shade-dried film, and after 30 seconds, the excess solution was poured off, and treated in an oven at 70°C for 2 minutes. The reverse osmosis anti-fouling membrane prepared by this method was continuously operated for 96 hours in a mixture solution with a concentration of sodium chloride of 500 ppm and bovine serum albumin of 1000 ppm. After 96 hours, the water flux and interception were tested, and the water flux was determined to be 60LMH, and the desalination rate was 99.6%.

Embodiment 2

[0026] Add 0.3% polyethyleneimine to 2% glycerin aqueous solution, mix evenly, coat on the reverse osmosis basement membrane, pour off the excess solution after 20s, dry in the shade, and use 0.2% polyvinyl alcohol and 1% The aqueous solution of glutaraldehyde was coated on the shade-dried film, and after 30 seconds, the excess solution was poured off, and treated in an oven at 70°C for 2 minutes. The reverse osmosis anti-fouling membrane prepared by this method was continuously operated for 96 hours in a mixture solution with a concentration of sodium chloride of 500 ppm and bovine serum albumin of 1000 ppm. After 96 hours, the water flux and interception were tested, and the water flux was determined to be 61LMH, and the desalination rate was 99.5%.

Embodiment 3

[0028] Add 0.4% polyethyleneimine to 2% glycerin aqueous solution, mix evenly, and coat it on the reverse osmosis basement membrane. After 20 seconds, pour off the excess solution and dry it in the shade. The aqueous solution of glutaraldehyde was coated on the shade-dried film, and after 30 seconds, the excess solution was poured off, and treated in an oven at 70°C for 2 minutes. The reverse osmosis anti-fouling membrane prepared by this method was continuously operated for 96 hours in a mixture solution with a concentration of sodium chloride of 500 ppm and bovine serum albumin of 1000 ppm. After 96 hours, the water flux and interception were tested, and the water flux was 62LMH, and the desalination rate was 99.6%.

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Abstract

The invention belongs to the technical field of reverse osmosis composite films, and particularly relates to a high-performance reverse-osmosis anti-pollution film and a preparation method thereof. The preparation method includes: pre-coating a high molecular water solution soluble in water on a reverse osmosis base film mainly to protect a film surface structure; after drying in the shade, coating a hydrophilic high molecular water solution; post-treating the reverse osmosis film at certain temperature to obtain the high-performance reverse-osmosis anti-pollution film, wherein additive or crosslinking agent soluble in water is contained in water phase of coating solutions. The high-performance reverse-osmosis anti-pollution film and the preparation method have the advantages that through a method of pre-coating and secondary coating, preparation of the high-performance reverse-osmosis anti-pollution film can be realized without changing or increasing preparation processes of conventional composite separation films; compared with the prior art, the high-performance reverse-osmosis anti-pollution film has the advantages that high water flux and rejection rate are maintained, the film has good anti-pollution performance, high reproducibility and low preparation cost.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis composite membranes, and specifically refers to a high-performance reverse osmosis membrane and a preparation method thereof. technical background [0002] Since JhonCadotte successfully prepared the reverse osmosis membrane through interfacial polymerization, this technology has been widely adopted by the industry, and after decades of continuous optimization of the reaction process and reaction additives by scientific researchers, the performance of the prepared reverse osmosis membrane is now For example, membrane flux and desalination rate have been greatly improved compared with decades ago. However, as the application of reverse osmosis membranes becomes wider and wider, the pollution problem of reverse osmosis membranes becomes more and more apparent. Studies have found that the interaction between the membrane surface and hydrophobic solutes and solute ions is the main cause of me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D61/02B01D65/00
CPCB01D61/02B01D67/0088B01D2325/36B01D2323/50B01D2323/02B01D67/0097
Inventor 陈可可翟丁李洪懿潘巧明
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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