As the core of modern water treatment technology, spiral reverse osmosis membrane elements are widely used in key fields such as seawater desalination, sewage treatment and pure water preparation. Its efficiency and stability have a direct impact on the performance of the entire water treatment system. However, membrane fouling has become a major obstacle to its long-term stable operation. This paper mainly focuses on the membrane fouling problem of spiral reverse osmosis membrane elements and its comprehensive treatment methods.
OneMajor pollutionClassification
The pollution of spiral reverse osmosis membrane elements can be divided into four categories: biological pollution, particulate suspended solids pollution, organic pollution and inorganic pollution. Biological pollution is mainly caused by the growth of microorganisms such as bacteria and algae, particulate suspended solids pollution is caused by sediment and rust in raw water, organic pollution is caused by organic substances such as humus and grease in raw water, and inorganic pollution is caused by the deposition of inorganic salts such as calcium, magnesium, and silicon in water. The accumulation of these contaminants not only leads to a decrease in flux and an increase in operating pressure in the reverse osmosis system, which increases energy consumption and operating costs, but can also cause damage to the membrane material and shorten the life of the membrane.
IIPrevention strategies
The key to effective membrane fouling prevention lies in the refined raw water pretreatment and the optimization of system operation. Raw water pretreatment measures, such as coarse filtration, dosing (pH adjustment, addition of flocculants, antiscalants) and ultrafiltration, can effectively remove most suspended solids, organic matter and some inorganic salts. In terms of system operation, the accumulation of contaminants on the membrane surface can be significantly reduced by setting operating parameters such as flow rate, pressure, and recovery rate, thereby delaying the occurrence of contamination.
IIICleaning & Recovery
Despite effective precautions, membrane elements can still be subject to contamination. At this time, it is particularly important to restore the membrane performance through scientific cleaning methods. Chemical cleaning and physical cleaning are two commonly used cleaning methods. Chemical cleaning mainly uses chemical reagents such as acids, alkalis, and oxidants to dissolve or decompose contaminants, while physical cleaning, such as high-pressure washing and backwashing, directly removes contaminants through physical force. The correct cleaning method can not only effectively restore the performance of the membrane, but also extend the service life of the membrane.
In summary, membrane fouling of spiral reverse osmosis membrane elements is a complex problem with multiple factors and mechanisms. In future research, more attention will be paid to the in-depth analysis of pollution mechanisms and the development of efficient and environmentally friendly cleaning technologies. The development of new anti-pollution membrane materials, the study of biological control technology of microbial pollution, and the use of new technologies such as advanced oxidation process are all important directions to improve cleaning efficiency and environmental protection. Through the application of these technologies, the operational performance of spiral reverse osmosis membranes can be further optimized, operating costs can be reduced, and environmental protection can also be contributed.
The article was edited and shared by Dalton Membrane, **Please note the source!