Water curing reverse osmosis membrane chemical cleaning method

A reverse osmosis membrane and chemical cleaning technology, which is applied in chemical instruments and methods, reverse osmosis, semi-permeable membrane separation, etc., can solve the problems of water production, desalination rate, recovery rate drop, reverse osmosis cannot be put into operation, professional cleaning lag In order to achieve the effect of good cleaning effect, convenient operation and low production cost

Inactive Publication Date: 2008-07-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of industrial water treatment, the surface of the reverse osmosis membrane will generate fouling due to the pollution of substances brought into the feed water during operation, such as: microorganisms contained in raw water; sediment pollution of raw water quality; hydrates of metal oxides, precipitation of calcium When the reverse osmosis membrane is fouled, its water production, desalination rate, and recovery rate will drop significantly. In severe cases, the reverse osmosis will not be able to be put into operation, causing production to be stopped. Even if the pretreatment design is reasonable and the operation is normal, Generally, reverse osmosis needs to be cleaned once every six months to one year
The cleaning work is usually done by professionals from the manufacturer, but limited by time, space, equipment, conditions and many other factors, professional cleaning often has a large lag, which has a serious impact on production, and the cost of cleaning is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Use NaOH solution containing EDTA to clean the microorganisms, organic matter and silica pollutants on the reverse osmosis membrane; use HCL solution to clean the calcium bicarbonate and magnesium bicarbonate scale on the reverse osmosis membrane. During the cleaning process, the pH value of the NaOH solution is 11, and the solution contains 0.5% EDTA by weight. The pH value of the HCL solution is 2. The cleaning process is as follows:

[0033] (1) Cleaning liquid injection: at a temperature of 25°C and a pressure of 0.1 MPa, the control flow rate is half of the normal flow rate and the cleaning liquid is injected;

[0034] (2) Cycle cleaning: Repeat cycle cleaning for 60 minutes at a temperature of 25°C and a pressure of 0.1-0.15 MPa; the pressure is controlled so that there is no permeate on the produced water side;

[0035] (3) Soaking: Soak for 1-15 hours;

[0036] (4) Cleaning: Clean for 60 minutes at room temperature, pressure 0.35MPa, and flow rate 1-1.5 times...

Embodiment 2

[0039] A water treatment reverse osmosis membrane chemical cleaning method, the pH value of the NaOH solution is 12, and the solution contains 1% EDTA by weight. The pH value of the HCL solution is 3. The cleaning process is as follows:

[0040] (1) Cleaning liquid injection: under the condition of temperature of 30°C and pressure of 0.15 MPa, control the flow rate to be half of the normal flow rate and inject the cleaning liquid;

[0041] (2) Cycle cleaning: Repeat cycle cleaning for 60 minutes at a temperature of 30°C and a pressure of 0.1-0.15 MPa; the pressure is controlled so that there is no permeate on the produced water side;

[0042] (3) Soaking: Soak for 1-15 hours;

[0043] (4) Cleaning: Clean for 30 minutes at room temperature, pressure 0.35MPa, and flow rate 1-1.5 times the normal flow rate;

[0044] (5) Rinse off the cleaning solution: Under the conditions of normal temperature and pressure of 0.35MPa, use ultrafiltration water or reverse osmosis to rinse off ...

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Abstract

The invention relates to a chemical cleaning method used for a water disposal reverse osmosis membrane, relating to a chemical cleaning method used for cleaning water disposal reverse osmosis membranes in the industrial water disposal process. The invention is characterized in that NaOH solution which contains EDTA is adopted to clean microorganism, organism and silicon dioxide, etc. pollutants on the reverse osmosis membrane; HCI solution is adopted to clean calcium bicarbonate and magnesium bicarbonate filth on the reverse osmosis membrane. By adopting the method of the invention, the reverse osmosis membrane used by captive power plant water disposal can be effectively cleaned in the alumina preparation process. The invention has better cleaning effect, reliable and practiced technique and convenient operation process.

Description

technical field [0001] The invention discloses a chemical cleaning method for a water treatment reverse osmosis membrane, relating to a chemical cleaning method for a water treatment reverse osmosis membrane in an industrial water treatment process. Background technique [0002] In the process of industrial water treatment, the surface of the reverse osmosis membrane will generate fouling due to the pollution of substances brought into the feed water during operation, such as: microorganisms contained in raw water; sediment pollution of raw water quality; hydrate of metal oxides, precipitation of calcium When the reverse osmosis membrane is fouled, its water production, desalination rate, and recovery rate will drop significantly. In severe cases, the reverse osmosis will not be able to be put into operation, causing production to be forced to stop. Even if the pretreatment design is reasonable and the operation is normal, Generally, the reverse osmosis needs to be cleaned o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D65/06B01D61/10
Inventor 王瑛
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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