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Organic fouling cleaning agent for reverse osmosis membranes

A technology of reverse osmosis membrane and cleaning agent, which is applied in the field of water treatment, can solve the problems of cumbersome procedures and complicated cleaning process, and achieve the effects of good bactericidal performance, less dosage, and improved wettability

Active Publication Date: 2017-07-14
杭州开宇环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, this method of cleaning must complete the cleaning process step by step. First, use alkaline substances to remove organic matter, and then carry out pickling to remove metal ions. The cleaning process is complicated and cumbersome.

Method used

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  • Organic fouling cleaning agent for reverse osmosis membranes

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Select raw materials according to weight percentage:

[0031] Sodium tetradecylbenzenesulfonate 0.0006%,

[0032] Hexadecyl o-dimethylbenzenesulfonic acid 0.0004%

[0033] Calcium Disodium EDTA Anhydrous 20%

[0034] Sodium hydroxide 0.001%

[0035] Trimetaphosphate Buffer 15%

[0036] 25% aqueous solution of glutaraldehyde 0.001%

[0037] The reverse osmosis system yields 64.997% water.

[0038]First add 64.997% of the reverse osmosis system product water into the reaction kettle, then add 0.0006% sodium tetradecylbenzenesulfonate, 0.0004% hexadecyl o-dimethylbenzenesulfonic acid, 20% anhydrous ethylenediamine Calcium disodium tetraacetate, 0.001% sodium hydroxide, 15% trimetaphosphate buffer solution, 0.001% 25% concentration glutaraldehyde aqueous solution are mixed, and stirring speed is 150 rev / mins, obtains intermediate mixture after dissolving, and water After cooling the intermediate mixture to 25°C, add sodium hydroxide to adjust the pH value of the mixed...

example 2

[0040] Select raw materials according to weight percentage:

[0041] Sodium tetradecylbenzenesulfonate 0.005%

[0042] Calcium Disodium EDTA Anhydrous 45%

[0043] Sodium hydroxide 0.005%

[0044] Trimetaphosphate Buffer 45%

[0045] 25% aqueous solution of glutaraldehyde 0.005%

[0046] The reverse osmosis system yields 9.985% water.

[0047] First add 9.985% of reverse osmosis system product water into the reaction kettle, then add 0.005% sodium tetradecylbenzenesulfonate, 45% anhydrous calcium disodium edetate, 0.005% sodium hydroxide, 45% Trimetaphosphate buffer solution, 0.005% 25% glutaraldehyde aqueous solution are mixed, the stirring speed is 200 rev / min, after dissolving, an intermediate mixture is obtained, after the intermediate mixture is cooled by water to 25°C, sodium hydroxide is added to adjust the mixed solution The pH value is 10.5, just stir until the solution is homogeneous.

example 3

[0049] Sodium tetradecylbenzenesulfonate 0.003%

[0050] Calcium Disodium EDTA Anhydrous 33%

[0051] Sodium hydroxide 0.003%

[0052] Trimetaphosphate buffer 30%

[0053] 25% aqueous solution of glutaraldehyde 0.003%

[0054] The reverse osmosis system yields 36.991% water.

[0055] First add 36.991% of reverse osmosis system product water into the reactor, then add 0.003% sodium tetradecylbenzenesulfonate, 33% anhydrous calcium disodium edetate, 0.003% sodium hydroxide, 30% Trimetaphosphate buffer solution, 0.003% 25% concentration of glutaraldehyde aqueous solution are mixed, the stirring speed is 200 rpm, after dissolving, an intermediate mixture is obtained, after cooling the intermediate mixture with water to 25°C, add sodium hydroxide to adjust the mixed solution The pH value is at 11, just stir until the solution is homogeneous.

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Abstract

The invention relates to an organic fouling cleaning agent for reverse osmosis membranes. The cleaning agent is composed of, by weight, 0.001-0.005% of a surfactant, 20-45% of a chelating agent, 0.001-0.005% of sodium hydroxide, 15-45% of a phosphate buffer, 0.001-0.005% of a membrane repairing agent and the rest of water. The surfactant is an alkylbenzene sulfonate composition or long-chain fatty alcohol polyoxyethylene ether sulfate. The chelating agent is calcium disodium edetate dihydrate. The membrane repairing agent is a glutaraldehyde aqueous solution. The ratio of glutaraldehyde to purified water is 25-50: 75-50. Through reasonable compatibility of several ingredients, a synergistic effect is produced. By the use of the cleaning agent, pollutions of colloid, organic matter and microorganisms slowly generated on reverse osmosis membranes are solved, salt content of producing water of a reverse osmosis system can be effectively reduced, and water yield of the reverse osmosis system is increased and pressure difference before and after the use of a reverse osmosis membrane is reduced.

Description

technical field [0001] The invention relates to the field of water treatment. More specifically, the present invention relates to a cleaning agent composition and application method for reverse osmosis membrane organic fouling. Background technique [0002] Reverse osmosis is a membrane separation technology driven by pressure difference with the help of the function of selective permeable membrane. When the pressure applied to the system is greater than the osmotic pressure of the solution, water molecules pass through the membrane and enter the central tube through the water flow channel. Flow out at one end. Impurities entering the water (such as hardness ions, colloids, organic matter, and bacteria) are trapped on the water inlet side of the membrane and flow out from the concentrated water outlet, so as to achieve the purpose of separation and purification. At present, reverse osmosis technology has been widely used in seawater desalination, pure water preparation, bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02
CPCB01D65/02B01D2321/164B01D2321/168
Inventor 王朝辉
Owner 杭州开宇环保科技有限公司
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