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Method for improving rejection of permeable membrane and permeable membrane

A membrane-permeable, blocking rate technology, applied in semi-permeable membrane separation, chemical instruments and methods, reverse osmosis, etc., can solve problems such as difficulty in recovering blocking rate, and achieve the effect of improving blocking rate

Active Publication Date: 2012-09-26
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, for a film that has undergone very large deterioration (for example, the electrical conductivity rejection rate has dropped below 95%), it is difficult to restore the rejection rate according to the existing technology.

Method used

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  • Method for improving rejection of permeable membrane and permeable membrane
  • Method for improving rejection of permeable membrane and permeable membrane
  • Method for improving rejection of permeable membrane and permeable membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0160] Add 5mg / L of 3,5-diaminobenzoic acid, 5mg / L of aminopentane and 10mg / L of polyvinylamidine (molecular weight: 3.5 million) to test water (NaCl concentration 2000mg / L aqueous solution) to make pH 6 aqueous solution, which is used as ammonia-treated water. This ammonia-treated water was supplied to a flat membrane test device. After operating under these conditions for 2 days, ultrapure water was supplied for washing, and then the test water was supplied to a flat membrane test device.

Embodiment 2

[0162] 5 mg / L of 3,5-diaminobenzoic acid and 5 mg / L of ammonium pentane were added to test water (aqueous solution with a NaCl concentration of 2000 mg / L) to obtain an aqueous solution with a pH of 6, which was used as ammonia-treated water. This ammonia-treated water was supplied to a flat membrane test device. After operating under these conditions for 2 days, ultrapure water was supplied for washing, and then the test water was supplied to a flat membrane test device.

Embodiment 3

[0164] 10 mg / L of 3,5-diaminobenzoic acid was added to test water (aqueous solution having a NaCl concentration of 2000 mg / L) to obtain an aqueous solution having a pH of 6, which was used as ammonia-treated water. This ammonia-treated water was supplied to a flat membrane test device. After operating under these conditions for 2 days, ultrapure water was supplied for washing, and then the test water was supplied to a flat membrane test device.

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Abstract

A method is provided with which it is possible to effectively improve the rejection of a membrane without considerably lowering the permeation flux, even when the membrane has significantly deteriorated. The method for improving the rejection of a permeable membrane includes a step (amino treatment step) in which an aqueous solution that contains a compound having an amino group and having a molecular weight of 1,000 or lower and has a pH of 7 or lower (amino treatment water) is passed through the permeable membrane. After this amino treatment step, water having a higher pH than the amino treatment water is passed through the permeable membrane. Thus, by passing the low-molecular amino compound, the part of the membrane which has deteriorated can be repaired without considerably lowering the permeation flux of this permeable membrane, and the rejection can be effectively improved.

Description

technical field [0001] The invention relates to a method for improving the rejection rate of the permeable membrane, in particular to a method for repairing the permeable membrane, especially the deteriorated reverse osmosis (RO) membrane, without greatly reducing the permeable flux of the permeable membrane. , and effectively increase its blocking rate. The present invention also relates to a permeable membrane subjected to a rejection rate-enhancing treatment by the method for increasing the rejection rate of the permeable membrane, a water treatment method using the permeable membrane, a permeable membrane device, and a water treatment device. Background technique [0002] In recent years, in order to effectively utilize water resources, processes for recovering, regenerating, and reusing waste water, or desalination processes for seawater and alkaline water have been introduced. In order to obtain high-quality treated water, selective permeation membranes such as nanofi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D65/10B01D71/82
CPCB01D2321/168C02F1/441C02F1/32C02F1/42C02F1/683B01D65/108C02F2103/04C02F1/001B01D61/02C02F1/444C02F1/66B01D67/0093B01D71/56C02F1/4695B01D67/00931
Inventor 青木哲也川胜孝博
Owner KURITA WATER INDUSTRIES LTD
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