Revealing the main "three black hands" of reverse osmosis membrane pollution: How much do you know?

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Reverse osmosis is a rapidly developed water treatment process in the 1960s, which has been widely used in urban water, boiler make-up water, power plant boiler make-up water, industrial wastewater and seawater desalination and solute separation in various solutions.

The working principle of reverse osmosis membrane is to separate the solvent in the solution by pressure as the driving force, which has good applications in food, electronics, medicine, printing and dyeing industries, but in the long-term use process, reverse osmosis membrane is vulnerable to various pollution, resulting in its performance decline, affecting water quality and water production. Optimizing the application and performance of reverse osmosis membranes is critical, especially in critical processes such as seawater desalination, pure water preparation and wastewater treatment.

One: Three types of pollution of reverse osmosis membrane

The pollution types of reverse osmosis membrane mainly include physical pollution, chemical pollution and organic pollution.

Physical pollution
Physical pollution mainly includes solid particles suspended in raw water, colloidal substances, metal oxides and other non-soluble substances on the surface of the film deposition and blockage. These contaminants may come from the raw water itself, or they may be impurities that are not effectively removed during the pretreatment process. Physical pollution can lead to membrane pore blockage, reduce membrane flux, and affect membrane separation efficiency.

Chemical pollution
Chemical pollution refers to the harmful chemical components adsorbed in the membrane pores, such as heavy metal ions, oxidants, reducing agents, etc. These chemicals may come from raw water, pre-treatment agents or cleaning agents. Chemical pollution will destroy the chemical structure of the membrane, lead to the deterioration of the membrane performance, and even cause safety problems.

Organic pollution
Organic pollution is one of the most difficult problems in reverse osmosis membrane pollution. Organic matter contained in raw water, such as bacteria, viruses, algae, fungi and other microorganisms and their metabolites, as well as humus, proteins and other macromolecular organic matter, may form pollution on the membrane surface and in the membrane pore. Organic pollution can not only reduce the membrane flux, but also destroy the desalting layer of the membrane, making the membrane lose the desalting function. In addition, organic pollution may also cause bacterial growth, further aggravating membrane pollution.

Two, how to achieve the prevention and control of membrane pollution

The problem of reverse osmosis membrane pollution is multi-dimensional and complex in practical application. For membrane pollution caused by physical pollution, chemical pollution, organic pollution and other factors, comprehensive and fine prevention and control measures must be taken.

At the prevention level, the focus is on optimizing the pretreatment process, strictly controlling the use of chemicals, strengthening microbial control, and ensuring that the system is properly operated to avoid accelerating the membrane contamination process due to human factors. At the same time, establish an effective monitoring and early warning system, through the real-time monitoring of key operating parameters, to achieve early detection, early treatment, in order to maintain the efficient and stable operation of the reverse osmosis system.

At the control level, it is not only necessary to regularly conduct a combination of physical and chemical cleaning, but also to choose a targeted cleaning program according to the characteristics of different types of pollution. For the pretreatment system, it should be ensured that it is always in good operating condition, effectively remove the suspended matter and colloids in the raw water, and reduce the burden of the membrane system.

RO membrane pollution is one of the important factors that affect the performance and life of RO system. It is very important to solve the problem of RO membrane pollution for ensuring water quality and increasing water yield. Through the comprehensive use of pretreatment optimization, chemical cleaning, anti-pollution technology and other means, the pollution degree of RO membrane can be effectively reduced, the operating efficiency and economy of RO system can be improved, and the sustainable use of water resources can be contributed.

In the future practice, with the progress of science and technology and the deepening of the understanding of membrane pollution mechanism, Dalton membrane will continue to conduct in-depth research, make reverse osmosis membrane pollution prevention and control technology more mature and perfect, and better serve the water resources needs and development of human society.

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