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Method for cleaning reverse osmosis membrane element

A reverse osmosis membrane and membrane element technology, applied in the field of water purification, can solve the problems of reduced membrane service efficiency and life, improper cleaning technology, etc., and achieve the effects of reducing damage, reducing production costs, and improving bactericidal effect

Inactive Publication Date: 2016-01-06
师宗煤焦化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of reduced membrane service efficiency and life due to improper cleaning technology, the present invention provides a cleaning method for reverse osmosis membrane elements to improve the cleaning effect of membrane elements polluted by low temperature, low turbidity, and high organic matter water quality, and prolong the reverse osmosis process. Membrane cleaning cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Chemically clean the 1# reverse osmosis unit of Shizong Coal Coke Chemical Co., Ltd. The design water production of the device is 80m 3 / h, classify two-stage membrane elements. Before cleaning, the conductivity of the produced water is 22.34μs / cm, the operating pressure difference is 0.42MPa, the recovery rate is 59%, and the produced water volume is 63m 3 / h, it is judged by analysis that the membrane elements are seriously polluted by bacteria and organic matter.

[0026] (1) Soak the membrane element to be cleaned with a non-oxidizing bactericide for 12 hours; the non-oxidizing bactericide is a solution of isothiazolinone diluted to a concentration of 5wt% with desalted water as a solvent; isothiazolone is Commercially available products have an active substance content of 12%; demineralized water refers to the use of various water treatment processes to remove suspended solids, colloids, and inorganic cations, anions and other impurities in water, and the resulti...

Embodiment 2

[0035] Chemically clean the 2# reverse osmosis unit of Shizong Coal Coke Chemical Co., Ltd. The design water production of the device is 80m 3 / h, classify two-stage membrane elements. The conductivity of the produced water before cleaning is 29.55μs / cm, the operating pressure difference is 0.42MPa, the recovery rate is 58%, and the produced water volume is 65t / h.

[0036](1) Soak the membrane element to be cleaned with a non-oxidizing bactericide for 24 hours; the non-oxidizing bactericide is a solution of isothiazolinone diluted to a concentration of 6wt% with desalted water as a solvent; isothiazolone is Commercially available products have an active substance content of 13%; desalted water refers to the use of various water treatment processes to remove suspended solids, colloids, and inorganic cations, anions and other impurities in water, and the resulting finished water has an electrical conductivity less than 0.2us / cm, pH is neutral; the main function of this step is...

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Abstract

The invention discloses a method for cleaning a reverse osmosis membrane element. The membrane element to be cleaned is soaked for several hours with non-oxidizing bactericide, then conventional closed circulating cleaning is carried out through a cleaning agent, the cleaned membrane element is flushed with demineralized water, conventional closed circulating cleaning is carried out on the flushed membrane element through an alkaline cleaning solution, the cleaned membrane element is flushed through demineralized water, and cleaning of the reverse osmosis membrane element is completed. After the cleaning scheme is executed, aiming at reverse osmosis treatment on low-temperature water, low-turbidity water, high-organic water, high-microorganism water and other special water, the cleaning effect on a polluted membrane element is obviously superior to that of a traditional cleaning scheme, the water yield and the recovery rate can be obviously increased, and the operating differential pressure and water production conductivity of anti-penetration equipment can be lowered. Meanwhile, the damage of chemical agents to the membrane element is reduced. After cleaning is carried out through the non-oxidizing bactericide, the pollution of bacteria to the membrane element can be effectively avoided, the cleaning period and the service life of reverse osmosis can be prolonged, and the production cost of subsequent equipment can be reduced.

Description

technical field [0001] The invention relates to a cleaning method for a reverse osmosis membrane element, belonging to the technical field of water purification. Background technique [0002] As a new water treatment technology, reverse osmosis has penetrated into various industrial fields. In the actual application process, the membrane elements provided by reverse osmosis membrane manufacturers have a wide range of universality, but lack of pertinence. The cleaning method of the membrane element is mostly simple acid and alkali (HCl, NaOH) repeated cleaning. [0003] The treatment of low temperature (water temperature below 12°C), low turbidity, high organic matter, and high microbial water has always been a recognized problem in the water treatment industry. The fouled membrane elements after reverse osmosis treatment of this type of water are greatly reduced due to conventional cleaning agent formulations or improper cleaning methods, which usually lead to low actual t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
Inventor 宋雁飞
Owner 师宗煤焦化工有限公司
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