Reverse osmosis membrane is the core of the reverse osmosis technology components.Due to the membrane pore size is very small, so can effectively remove salt dissolved in water, colloid, microorganism and organic matter, etc.System has a good water quality, low consumption, no pollution, simple process and the advantages of easy operation, widely used in pharmaceutical, industrial production and other fields, such as waste leachate treatment, high concentration, high concentrated wastewater containing salt, radioactive waste water treatment and other industries.
The expert inside course of study reminds, reverse osmosis membrane element is the important part in the water treatment system, so the reverse osmosis membrane cleaning on a regular basis is very important.Industry in the company's technical staff, the reverse osmosis membrane cleaning solution is mainly divided into physical method and chemical method, two methods can effectively on membrane cleaning.
Among them, the physical mechanical force is used to remove contaminants on the surface of the membrane.The won't happen any chemical reactions in the cleaning process.Physical method and can be divided into manual scrubbing method, such as hydraulic pressure flushing method, reverse flushing method, hot water washing method, water in mixing cleaning method, five kinds of methods.
Manual scrubbingThis method is a kind of primitive but effective method.Mother, it is apart of flat membrane with soft material, such as sponge) gently wipe the dirt on the surface of the membrane, side to wipe water rinse, this method can effectively get rid of a lot of dirt on the membrane surface.But for film hole deep, more tiny impurities of the powerless.
Isobaric water irrigation
Any configuration of ultrafiltration components can use this method for membrane cleaning.Particular way is closed water production valve, open the thick water outlet valve, by increasing the velocity of washing membrane surface, the effective to remove the film on the surface of a large number of spongy impurities.Pressure washing effect but also to the continuous irrigation frequency.
Reverse flushing method
Reverse flushing method is a kind of from the back of the membrane (porous support layer) to positive (close) to wash method.This is a kind of effective cleaning method.After backwashing membrane, and then to isobaric water irrigation, cleaning effect is very obvious.
Hot water washing method
Using the heated water (30 ~ 40 ~ C) wash the membrane surface, for those with hot sticky stiff and soluble impurities (such as sugar) removal effect is obvious.
Water in mixed cleaning method
Will clean compressed air with water into the ultrafiltration device, the water flows in mixed experience intense agitation effect on the membrane surface and to get rid of the impurity is stubborn.The effect is good.
Compared with the above the five kinds of physical methods, chemical methods is the use of some chemicals and on the surface of the membrane filter cake to achieve the purpose of cleaning membrane for chemical reaction.
Technical staff pointed out that the reverse osmosis membrane cleaning principle of selecting the chemicals: one can't be any chemical reactions with membrane material and other components, 2 it is to cannot be used because the chemicals and cause secondary pollution.
Reverse osmosis membrane, therefore, there are two types of chemical cleaning method.One is using oxidizing cleaner.By 1% ~ 3% H2O2, 500 ~ 1000 to 4040 mg/LNaCl0 aqueous solution and reverse osmosis membrane cleaning, to remove dirt, the effect of kill bacteria;The other is a enzyme detergent to clean.Such as o. 5% ~ 1.5% pepsin, trypsin, etc., when the reverse osmosis membrane cleaning to remove protein, more refined, polysaccharide, oil pollution effectively.
Industry experts said, whether physical or chemical method, has its own advantages.In pharmaceutical and other industries, the cleaner will often be used in the chemical cleaning method, combined with the constant pressure flushing and reverse flushing method, so as to achieve the purpose of more effectively remove contaminants on the surface of the membrane.