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Reverse osmosis membrane repairing agent and reverse osmosis membrane offline repairing method

A technology of reverse osmosis membrane and repair agent, which is applied in semi-permeable membrane separation, osmosis/dialysis water/sewage treatment, reverse osmosis, etc. There are substantial improvements and other issues to achieve the effect of saving solid waste treatment costs, improving economic and social benefits, and reducing pollution

Active Publication Date: 2021-03-12
天津市尚拓环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing repair technology can repair the desalination layer of the reverse osmosis membrane to increase the desalination rate, but it does not mention the stability of the repair layer. If the repair layer is not firmly connected with the membrane surface, it is easy to cause the repair layer to fall off. The salt rejection rate has not been substantially improved
[0005] Chinese patent "Forward osmosis, nanofiltration and reverse osmosis membrane desalination rate repair agent and repair method", application number 201811515518.3, the technical solution mentioned in this patent mainly overcomes the technical defect that the repair operation can be performed on the membrane in the shutdown state, It can also be carried out without shutting down the membrane filtration device, but this solution does not elaborate on the stability of the repair effect

Method used

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  • Reverse osmosis membrane repairing agent and reverse osmosis membrane offline repairing method
  • Reverse osmosis membrane repairing agent and reverse osmosis membrane offline repairing method
  • Reverse osmosis membrane repairing agent and reverse osmosis membrane offline repairing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The configuration of the repair agent:

[0025] Ingredients and content of agent A: polydimethylvinylpropylammonium chloride 10%, glutaraldehyde 30%, purified water 60%; ingredients and content of agent B: polyethylene glycol 7.5%, sodium polyacrylate 35%, pure Water 57.5%.

[0026] Off-line repair method of reverse osmosis membrane: Off-line cleaning refers to removing the oxidized reverse osmosis membrane at the customer site, and then installing it into the reverse osmosis membrane repair equipment for repair.

[0027] The first step: acid cleaning the reverse osmosis membrane first, the acid cleaning pressure is 0.4bar, the pH of the acid cleaning is 2.6, and the acid cleaning time is 20min. The washing pH is 11.3, and the alkaline washing time is 20 minutes;

[0028] The second step: carry out alkali washing on the reverse osmosis membrane after cleaning. The alkali washing solution is sodium lauryl sulfate aqueous solution, the alkali washing pressure is 0.4 bar...

Embodiment 2

[0038] The configuration of the repair agent:

[0039] Ingredients and content of agent A: dodecyl dimethyl benzyl ammonium chloride 9%, glutaraldehyde 31%, purified water 60%; ingredients and content of agent B: polyethylene glycol 8%, sodium polyacrylate 35% , Purified water 57%.

[0040] Off-line repair method of reverse osmosis membrane: Off-line cleaning refers to removing the oxidized reverse osmosis membrane at the customer site, and then installing it into the reverse osmosis membrane repair equipment for repair.

[0041] The first step: acid cleaning the reverse osmosis membrane first, the acid cleaning pressure is 0.3bar, the pH of the acid cleaning is 2.4, and the acid cleaning time is 20min. The washing pH is 11.6, and the alkaline washing time is 20 minutes;

[0042] The second step: carry out alkali washing on the reverse osmosis membrane after cleaning, the alkali washing solution is sodium lauryl sulfate aqueous solution, the alkali washing pressure is 0.3 ba...

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Abstract

The invention discloses a reverse osmosis membrane repairing agent which is characterized by comprising a component A and a component B which are independently prepared, wherein the component A is prepared from the following raw materials in parts by weight: 5%-15% of one of polydimethyl ethylene propyl ammonium chloride, polymethallyl amine propyl trimethyl ammonium chloride, polymethacrylamide trimethyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride; 25%-35% of glutaraldehyde; and the balance of purified water. The component B comprises the following raw materials in parts by weight: 5-10% of one of polyethylene glycol and polyvinyl alcohol; 30%-40% of one of sodium polyacrylate, anionic polyacrylamide, polyacrylic acid and polyacrylate; and the balance of purified water. The invention also discloses a method for realizing offline repair of the reverse osmosis membrane, the desalination rate of the reverse osmosis membrane after oxidation can be recovered to 97% or above, the recovery rate of a single membrane can be recovered to about 15%, and the repair effect can be stably maintained for half a year or longer.

Description

technical field [0001] The invention belongs to the field of repairing reverse osmosis membranes, in particular to a repairing agent for reverse osmosis membranes and an off-line repairing method for reverse osmosis membranes. Background technique [0002] Reverse osmosis membrane technology is a pressure-driven membrane separation technology that separates solutes from solvents in solution. It has been widely used in various fields and has become one of the mainstream technologies for seawater desalination and advanced wastewater treatment. The commercial polyamide reverse osmosis composite membrane consists of three layers, which are non-woven fabric for reinforcement, porous polysulfone support layer and aromatic polyamide active separation layer. Among them, the aromatic polyamide active separation layer plays an important role in the desalination rate. decisive role. [0003] During the operation of the reverse osmosis system, pollutants such as inorganic particles, co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D65/06B01D61/02C02F1/44
CPCB01D65/02B01D61/025C02F1/441B01D2321/168C02F2209/05Y02A20/131
Inventor 张文君吕俐张鸿芳李桂平
Owner 天津市尚拓环保科技有限公司
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