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Reclaimed water recycling reverse osmosis membrane cleaning agent

A reverse osmosis membrane and cleaning agent technology, which is applied in the field of reverse osmosis membrane cleaning agent and cleaning for reclaimed water reuse, can solve the problems of reverse osmosis membrane difficult to restore membrane flux, secondary pollution, and reduce the service life of reverse osmosis membrane. Achieve good biodegradability, prolong the service life of the membrane, and inhibit the growth of microorganisms

Inactive Publication Date: 2020-09-11
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to restore the membrane flux to the heavily polluted reverse osmosis membrane by using conventional chemical cleaning agents and cleaning methods, and the use of a large number of chemical cleaning agents will have a certain impact on the structure of the reverse osmosis membrane itself (such as desalination Layer damage), thereby reducing the service life of the reverse osmosis membrane, and may also cause secondary pollution

Method used

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  • Reclaimed water recycling reverse osmosis membrane cleaning agent
  • Reclaimed water recycling reverse osmosis membrane cleaning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The reverse osmosis membrane cleaning agent for reclaimed water is composed of acidic cleaning components and alkaline cleaning components according to the following mass percentages:

[0024] (1) Acid cleaning agent: 0.05% hydrochloric acid, 0.2% organic acid, and the balance is water;

[0025] (2) Alkaline cleaning agent: 0.1% sodium hydroxide, 0.02% biosurfactant, 0.02% metal ion complexing agent, 0.02% bactericide, and the balance is water.

[0026] The organic acid is a mixture of sulfamic acid and citric acid at a mass ratio of 1:1; the biosurfactant is rhamnolipid; the metal ion complexing agent is ethylenediamine disuccinate tris A mixture of sodium and disodium edetate at a mass ratio of 1:1; the bactericide is a non-oxidative bactericide isothiazolinone; the water is reverse osmosis water.

[0027] The preparation method of described acid reverse osmosis cleaning agent is:

[0028] Step 1, get hydrochloric acid, sulfamic acid, citric acid and water respectiv...

Embodiment 2

[0035] The reverse osmosis membrane cleaning agent for reclaimed water is composed of acidic cleaning components and alkaline cleaning components according to the following mass percentages:

[0036] (1) Acid cleaning agent: 0.15% hydrochloric acid, 0.15% organic acid, and the balance is water;

[0037] (2) Alkaline cleaning agent: 0.15% sodium hydroxide, 0.03% biosurfactant, 0.04% metal ion complexing agent, 0.04% bactericide, and the balance is water.

[0038] The organic acid is a mixture of sulfamic acid and citric acid at a mass ratio of 1:1; the biosurfactant is rhamnolipid; the metal ion complexing agent is ethylenediamine disuccinate tris A mixture of sodium and disodium edetate at a mass ratio of 1:2; the bactericide is a non-oxidative bactericide isothiazolinone; the water is reverse osmosis water.

[0039] The preparation method is the same as in Example 1, the pH value of the final acid cleaning component is 1.8, and the pH value of the alkaline reverse osmosis me...

Embodiment 3

[0041] The reverse osmosis membrane cleaning agent for reclaimed water is composed of acidic cleaning components and alkaline cleaning components, respectively according to the following mass percentages:

[0042] (1) Acid cleaning agent: 0.2% hydrochloric acid, 0.1% organic acid, and the balance is water;

[0043] (2) Alkaline cleaning agent: 0.2% sodium hydroxide, 0.05% biosurfactant, 0.05% metal ion complexing agent, 0.05% bactericide, and the balance is water.

[0044] The organic acid is a mixture of sulfamic acid and citric acid at a mass ratio of 1:1; the biosurfactant is rhamnolipid; the metal ion complexing agent is ethylenediamine disuccinate tris A mixture of sodium and disodium edetate at a mass ratio of 1:1.5; the bactericide is a non-oxidative bactericide isothiazolinone; the water is reverse osmosis water.

[0045] The preparation method is the same as that in Example 1, the pH value of the final acidic reverse osmosis membrane cleaning agent is 1.5, and the pH...

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Abstract

The invention discloses a reclaimed water recycling reverse osmosis membrane cleaning agent, and belongs to the technical field of membrane element cleaning. The cleaning agent comprises an acidic cleaning agent and an alkaline cleaning agent. The acidic cleaning agent comprises the following main components in percentage by weight: 0.02-0.2% of hydrochloric acid, 0.1-0.2% of organic acid and thebalance of water. The alkaline cleaning agent comprises the following main components in percentage by weight: 0.05-0.2% of sodium hydroxide, 0.01-0.1% of biosurfactant, 0.02-0.2% of metal complexingagent, 0.01-0.1% of bactericide, and the balance of water. A use method comprises the following steps: cleaning the reverse osmosis membrane with the acidic cleaning agent, then cleaning the reverse osmosis membrane with the alkaline cleaning agent, and washing the reverse osmosis membrane with clear water after cleaning with the acidic cleaning agent and the alkaline cleaning agent, wherein during on-line cleaning, a part of concentrated water and produced water need to be discharged into a wastewater pool at the initial stage of cleaning. The reverse osmosis membrane cleaning agent disclosedby the invention is an environment-friendly composite formula which is easy to biodegrade, all the components play a role in coordination and synergy during cleaning, the cleaning agent has excellentcleaning performance on a reverse osmosis membrane which is seriously polluted during reclaimed water recycling, and the usage amount of the cleaning agent is small.

Description

technical field [0001] The invention relates to a cleaning agent and a cleaning method for a reverse osmosis membrane for reuse of reclaimed water, and belongs to the technical field of membrane element cleaning. Background technique [0002] With the development and utilization of water resources, the water resources available for human use are decreasing day by day, and water pollution is also becoming more and more serious. The high water consumption in the chemical industry has brought great pressure to enterprises. As a potential water resource with sufficient water volume and stable water quality, reclaimed water is reused in factories as raw water for supplementary water for circulating cooling water systems and boiler supply water. It can reduce the water pressure of enterprises to a certain extent, and has obvious social, economic and environmental benefits. In the reclaimed water reuse treatment process, the reverse osmosis system is the core technology, and the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
CPCB01D65/02B01D2321/162B01D2321/164
Inventor 宋丹丹周连伟王泽王秀莉尚玉俊庞海岩王作堯张方
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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