Reverse osmosis is a membrane separation operation that uses pressure difference as the driving force to separate the solvent from the solution. To achieve the purpose of separation, extraction, purification, and concentration. Reverse osmosis membrane can effectively remove dissolved salts, colloids, microorganisms, organic substances, etc. in water due to its very small pore size. Many people do not know how to clean the reverse osmosis membrane, and then the Reverse Osmosis Systems Manufacturer(KOKOELECTRIC) will teach everyone how to clean the reverse osmosis membrane.

Experts in the industry remind that reverse osmosis membrane components are an important component of water treatment systems, so regular reverse osmosis membrane cleaning is essential. At present, reverse osmosis membrane cleaning schemes are mainly divided into physical methods and chemical methods. Both methods can effectively clean the membrane.

Among them, the physical method is to use mechanical force to remove pollutants on the membrane surface. No chemical reaction will occur during the whole cleaning process. Physical methods can also be divided into manual scrubbing, equal pressure hydraulic flushing, reverse flushing, hot water flushing, and water-air mixed cleaning.

1. Manual scrubbing method

This method is relatively primitive but effective. The mother’s method is to gently wipe the dirt on the membrane surface with a soft substance (such as sponge) and wash it off with water while wiping. This method can effectively remove a large amount of dirt on the membrane surface. However, there is nothing we can do about the finer impurities penetrating into the membrane pores.

2. Equal pressure hydraulic flushing method

Ultrafiltration modules of any configuration can be cleaned by this method. The specific method is to close the water production valve, open the concentrated water outlet valve and flush the membrane surface with an increased flow rate, which is effective for removing a large number of soft impurities on the membrane surface. The effect of isobaric flushing is also related to the frequency of continuous flushing.

3. Backflushing method

Backflushing is a method of flushing from the back surface (porous support layer) to the front surface (dense layer) of the membrane. This is an effective cleaning method. After the membrane is backwashed, an equal pressure hydraulic flushing method is carried out, and the cleaning effect is very obvious.

4. Hot water flushing method

Flushing the membrane surface with heated water (30 ~ 40 ~ c) has obvious removal effect on those viscous and heat-soluble impurities (such as saccharides).

5. Water-air mixed cleaning method

The purified compressed air is sent to the ultrafiltration device together with water, and the water-air mixed fluid will produce violent agitation on the membrane surface to remove stubborn impurities. The effect is also better.

Compared with the above five physical methods, the chemical method uses a certain chemical to carry out a chemical reaction with the filter cake on the membrane surface to achieve the purpose of cleaning the membrane.

Technical personnel pointed out that the principle of selecting chemicals for reverse osmosis membrane cleaning is: firstly, no chemical reaction can occur with membrane and other component materials; secondly, no secondary pollution can be caused due to the use of chemicals.

Therefore, there are two kinds of chemical cleaning methods for reverse osmosis membranes. One is to use an oxidizing cleaning agent. The 4040 reverse osmosis membrane was cleaned with 1% ~ 3 1%～3%H2O2, 500 ~ 1000 mg/lnacl0 and other aqueous solutions to remove dirt and *** bacteria. The other is washing with enzyme detergent. For example, 0.5% ~ 1.5% pepsin, trypsin, etc. are effective in removing protein, polysperm, polysaccharide and grease pollutants during reverse osmosis membrane cleaning.

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