What about the degradation of reverse osmosis membrane performance

- May 16, 2019-

With the progress of society, water treatment equipment has been widely used in various industries. Softening water equipment to reduce the hardness of water equipment, mainly in addition to removing calcium, magnesium ions in the water, softening water equipment in the process of softening water, can not reduce the total salt content in the water, could be used for air conditioning and other systems of recharge water softening and domestic water treatment. In the process of water treatment equipment operation, there will always be a variety of problems. So, what about the decline in the performance of reverse osmosis membranes in water treatment equipment? The decrease of reverse osmosis membrane performance is mainly due to the pollution of membrane surface, such as fouling of membrane surface, blockage of membrane surface or physical and chemical changes of membrane itself. The physical changes are mainly due to the decrease of membrane permeability caused by pressure effectiveness, and chemical changes are mainly caused by fluctuations in pH value, such as the hydrolysis of cellulose acetate membrane, and free chlorine can worsen the performance of aromatic polyamide membranes. The main causes of reverse osmosis membrane pollution and blockage are the deposition of membrane surface and the growth of microorganisms. Microorganisms not only clog the membranes, but also erode cellulose acetate. Therefore, the membrane must maintain a certain amount of residual chlorine, but too high residual chlorine will lead to a decrease in membrane properties, so cellulose acetate membrane anterior residual chlorine is 0.1~0.5 mg≤L, and aromatic polyamide membrane anterior residual chlorine is less than 0.1 mg/l, Reverse osmosis membrane cleaning treatment is a meticulous and cumbersome work. At present, the quality of the domestic membrane is not high enough, cleaning film is easy to suffer multiple damage.

In order to reduce cleaning work, we must do a good job in the pre-treatment work, strictly shut down the water quality, otherwise, the future will be endless.

Water treatment Equipment After the treatment of 1h with 0.1% formaldehyde solution or mg/l bromide, 2% ammonium citrate solution (pH=4~8) or sodium bisulfite, six phosphate, dilute hydrochloric acid, etc., were used for cleaning to prevent the scaling of manganese, iron and carbonate. Water treatment equipment through a variety of physical, chemical means to remove some of the water on the production, life do not need harmful substances, this kind of water for the filtration and purification of equipment. Because social production, life and water are closely related, therefore, the field of water treatment involves a wide range of applications, constitute a huge industrial application. In the domestic medicine, biology, electronics, chemical industry, power plant, sewage treatment and other fields have been widely used. Pure water purification equipment is simply the production of pure aquatic equipment. And pure water is widely used by us: living drinking, chemical, medical, breeding, planting, food, beverages and so on. The following will give you a brief introduction. Components and processes for the production of purified water. Hope to be able to understand the industry to provide some help. Organic matter is sometimes washed with enzyme detergent. The cleaning pressure is controlled at 0.34~0.98 MPa (3.5~10kgf/cm2) and the cleaning flow is 2~3 times the flow rate of the original water treatment.