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Chemical cleaning method for reverse osmosis membrane

A chemical cleaning and reverse osmosis membrane technology, which is applied in chemical instruments and methods, reverse osmosis, semi-permeable membrane separation, etc., can solve the problems of unsatisfactory operating time and service life of reverse osmosis membranes

Active Publication Date: 2021-09-14
JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing cleaning methods are still not ideal for prolonging the operating time and service life of reverse osmosis membranes

Method used

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  • Chemical cleaning method for reverse osmosis membrane
  • Chemical cleaning method for reverse osmosis membrane
  • Chemical cleaning method for reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The reverse osmosis membrane chemical cleaning method described in the present embodiment comprises the following steps:

[0056] (1) prepare reverse osmosis cleaning agent, the mass fraction of its raw material is: EDTA ammonium salt (ammonium ethylenediamine tetraacetate) 15%, chelating agent (ATMP Na 4 ) 5%, ethanolamine 3%, and the rest is water;

[0057] Prepare the bactericide, the mass fraction of its raw materials is: organic bromine (DBNPA) 10%, first auxiliary agent (lactic acid) 2%, solvent (polyethylene glycol) 60%;

[0058] Prepare an acid cleaning agent, the mass fraction of its raw materials is: citric acid 15%, organic phosphoric acid (hydroxyethylidene diphosphoric acid) 5%, and the rest is water;

[0059] Prepare an alkaline cleaning agent, the mass fraction of its raw materials is: EDTA disodium salt 15%, sodium dodecylsulfonate 1%, the second auxiliary agent (lactic acid) 2%, and the rest is water;

[0060] (2) preparation mass fraction is 30% hydr...

Embodiment 2

[0075] The reverse osmosis membrane chemical cleaning method described in this embodiment is the same as in Example 1, the difference is that the alkali cleaning process specifically includes the following steps:

[0076] (1) Use fresh alkali cleaning reagent prepared for the first time to clean the first section of reverse osmosis membrane components. The alkali cleaning time is 2 hours, and the ratio of reverse osmosis membrane area to alkali cleaning time is 26㎡ / min. At the same time, it is treated with ultrasonic oscillation The first reverse osmosis membrane module;

[0077] (2) Use the fresh alkali cleaning reagent prepared for the second time to clean the second and third reverse osmosis membrane components in series. The alkaline cleaning time is 2 hours, and the ratio of the reverse osmosis membrane area to the alkaline cleaning time is 18.5㎡ / min. At the same time, it cooperates with ultrasonic oscillation to process the second and third reverse osmosis membrane compo...

Embodiment 3

[0081] The chemical cleaning method for the reverse osmosis membrane described in this embodiment is the same as that of Embodiment 2, the difference is that the step of washing and cleaning the water tank is included before the pickling step:

[0082] (1) Observation: Fill the cleaning water tank with water and observe the clarity of the water in the water tank. If the water is turbid, it needs to be washed;

[0083] (2) Open the steam inlet valve of the cleaning water tank, heat the water in the cleaning water tank to 25°C, shake the cleaning water tank, and discharge the water in the cleaning water tank after washing;

[0084] (3) Fill water again and repeat the operation of step (2) until the water in the cleaning water tank is clear.

[0085] The difference is also that in the pickling step, after the pickling reagent has cleaned all the reverse osmosis membrane components, it circulates back to the cleaning water tank, and after detecting the pH value, it is used to clea...

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Abstract

The invention relates to a chemical cleaning method for a reverse osmosis membrane. The chemical cleaning method comprises the following steps: S100, preparing a reverse osmosis cleaning agent, a sterilizing agent, an acidic cleaning agent and an alkaline cleaning agent; S200, preparing an acid washing reagent by using the acidic cleaning agent, the sterilizing agent and a hydrochloric acid solution, and preparing an alkali washing reagent by using the alkaline cleaning agent, the reverse osmosis cleaning agent and a sodium hydroxide solution; S300, carrying out acid washing, wherein the reverse osmosis membrane assemblies of all production sections are cleaned in series by using the acid washing reagent, and the reverse osmosis membrane assemblies of all production sections are treated in cooperation with ultrasonic oscillation; S400, carrying out replacement cleaning, wherein the reverse osmosis membrane assemblies of all the production sections are cleaned in series by using reverse osmosis inlet water until the pH value of the outlet water is neutral, and the reverse osmosis membrane assemblies of all the production sections are treated in cooperation with ultrasonic oscillation; S500, carrying out alkali washing, wherein the reverse osmosis membrane assembliesof all production sections are cleaned by using the alkali washing reagent, and the reverse osmosis membrane assemblies of all production sections are treated in cooperation with ultrasonic oscillation; and repeating the replacement cleaning step in the step S400 until the pH value of the effluent is neutral.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis membrane cleaning, and in particular relates to a chemical cleaning method for reverse osmosis membranes. Background technique [0002] With the advancement of modern sewage treatment and pure water production technology, the application of reverse osmosis technology is becoming more and more mature. Reverse osmosis is a membrane separation operation that uses pressure difference as the driving force to separate the solvent from the solution. Apply pressure to the feed liquid on one side of the membrane. When the pressure exceeds its osmotic pressure, the solvent will permeate against the direction of natural permeation. According to the different osmotic pressures of various materials, the reverse osmosis pressure greater than the osmotic pressure can be used, that is, the reverse osmosis method, to achieve the purpose of separation, extraction, purification and concentration. It can be...

Claims

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Application Information

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IPC IPC(8): B01D65/02B01D65/06B01D61/08B01D61/10C02F1/44
CPCB01D65/02B01D65/022B01D65/06B01D61/025B01D61/08B01D61/10C02F1/441C02F2209/06C02F2209/02Y02A20/131
Inventor 张良杜毛毛高占峰王冬燕万文峰
Owner JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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