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Anti-oxide composite reverse osmosis membrane

A reverse osmosis membrane, oxidation-resistant technology, applied in the field of water treatment, can solve the problems of increased operating costs, short service life of reverse osmosis membrane, biochemical pollution of colloidal particles, etc., to achieve chlorine resistance and anti-pollution performance improvement, cleaning interval period Long, good oxidation resistance effect

Active Publication Date: 2009-05-13
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the process of purifying water, the reverse osmosis membrane will also be polluted by some organic or inorganic substances in the water, such as inorganic ions, bacteria, viruses, organic substances and colloids in raw water will be adsorbed on the reverse osmosis membrane, resulting in colloidal particles Pollution and Biochemical Contamination
Reduce the water flux of the reverse osmosis membrane; in addition, the ordinary polyamide reverse osmosis membrane is very sensitive to chlorine, and a very low concentration of chlorine will destroy the performance of the membrane, causing the membrane to lose the desalination rate in a short time
Most of the current water sources are polluted, and some are treated waste water. The water source contains a large amount of oxidizing fungicides. Therefore, the existing reverse osmosis membrane has a short service life and needs to be replaced frequently, which increases the operating cost. , which also reduces the operating efficiency of the membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The composite reverse osmosis membrane prepared in Comparative Example 1 was taken out and soaked for 30 minutes with a potassium persulfate solution with a concentration of 1% when the pH of the potassium phosphate buffer solution was 8. Then keep it in an oven at 140° C. for 5 minutes to obtain the final oxidation-resistant composite reverse osmosis membrane.

[0015] Use an aqueous solution containing 2000ppm sodium chloride, the pH is 7.5, and test the initial performance of the membrane under the condition of 225psi, then soak it in 2000ppmNaClO solution for 30 hours and then test the performance of the membrane under the above conditions, the results obtained are as follows: the initial desalination of the membrane The rate is 99.2%, and the water flux is 23.3GFD. After NaCl0 (sodium hypochlorite) oxidation treatment, the desalination rate is 98.8%, and the water flux is 28.7GFD.

Embodiment 2—7

[0017] Except that the treatment time of potassium persulfate was different, the composite reverse osmosis membrane was prepared by the same operation as in Example 1. Then adopt the test method identical with embodiment 1, its result is shown in Table 1.

Embodiment 2--7

[0019] Example 2 3 4 5 6 7 Potassium persulfate treatment time (min)

[0020] It can be seen from Table 1 that after treatment with potassium persulfate, the oxidation resistance of the membrane is significantly improved.

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Abstract

The present invention discloses an oxidation-resisting composite reverse osmosis membrane. Its composition includes non-woven fabric layer, polysulfone supporting layer and polyamide layer placed on the polysulfone supporting layer. It is characterized by that the polyamide layer is soaked in the superphosphate solution, then taken out and dried so as to obtain the invented oxidation-resisting composite reverse osmosis membrane. Said invention is easy in preparation and is high in desaltination rate.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a composite reverse osmosis membrane used for water treatment. Background technique [0002] Reverse osmosis technology is a separation method that separates the solute and the solvent in the solution by means of the selective interception of the reverse osmosis membrane under a certain pressure. It is widely used in sewage treatment and liquid purification and concentration, the most common of which is The application is in the water treatment process, using reverse osmosis technology to remove impurities such as inorganic ions, bacteria, viruses, organic matter and colloids in raw water to obtain high-quality pure water. However, during the process of purifying water, the reverse osmosis membrane will also be polluted by some organic or inorganic substances in the water, such as inorganic ions, bacteria, viruses, organic substances and colloids in raw water will be adsorbed on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/56B01D71/68
Inventor 吴宗策赵小阳何耀华蔡志奇王思亮龙昌宇刘枫
Owner VONTRON TECH CO LTD
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