In the face of increasingly serious water shortage situation, reverse osmosis (RO) has become the mainstream of water treatment technology. However, membrane fouling has been a major obstacle to the further development of reverse osmosis technology and its operating costs. In response to the above problems, Meng Jianqiang from Tianjin Polytechnic University tried to make multi-functional modification on the surface of RO membrane by multi-component reaction. One-step reaction also introduced anti-contamination components and antibacterial components into the membrane surface, effectively inhibiting organic pollution, inorganic pollution and biological Pollution, preparation of anti-bacterial anti-pollution reverse osmosis membrane.
The real progress of reverse osmosis composite membrane to effectively enhance the sewage treatment technology
Recently, the reverse osmosis membrane team of the State Key Laboratory of Separation Membranes and Membrane Processes at Tianjin University of Technology made significant progress in the preparation of anti-bacterial anti-fouling reverse osmosis membranes. The reverse osmosis membranes prepared by them are characterized by the presence of organic pollutants, inorganic pollutants and microorganisms Of the conditions show good anti-pollution, and the preparation method is simple, mild conditions, taking into account the advantages of high efficiency and economy.
According to reports, the technical achievements published in the field of international materials, the famous chemical journal "Materials Chemistry", entitled "multi-component reaction based on one-step multifunctional graft grafting antibacterial reverse osmosis composite membrane."
Faced with the increasingly serious water shortage situation, the search for energy-efficient water treatment technology is imminent. Reverse osmosis (RO) is widely used in the fields of sea water, brackish water desalination, waste water resource and ultrapure water preparation due to its advantages of simple operation, low energy consumption, large permeate flux, high rejection rate and environmental friendliness.
However, membrane fouling has been a major obstacle to the further development of reverse osmosis technology and its operating costs. Surface modification is the preparation of anti-fouling reverse osmosis membrane, an important means to alleviate membrane pollution. RO system has complicated influent components and contains many kinds of pollutants such as organic matter, inorganic matter, colloid and microorganism. The traditional surface modification method can only deal with one kind of pollution action mechanism, and it is difficult to effectively solve the problem of membrane pollution under actual water conditions. Preparation of highly efficient anti-pollution RO composite membrane is one of the biggest challenges researchers in the field of membrane.
In response to the above problems, the research group Professor Meng Jianqiang multi-component reaction through RO membrane surface multi-functional modification at room temperature, methanol as a solvent, one-step reaction at the same time anti-pollution ingredients and antibacterial ingredients introduced into the membrane surface. The results showed that the permeation flux decay rate of the modified RO composite membrane was far lower than that of the original membrane when filtered bovine serum albumin and high hardness inorganic salt aqueous solution, and the recovery rate after short-term washing was also significantly improved. In addition, bacterial culture results showed that the membrane material antibacterial rate as high as 98%.
Due to the mild conditions of the method, convenient and quick, with good application prospects. Anti-bacterial anti-fouling reverse osmosis membrane scale preparation, is expected to reduce the frequency of reverse osmosis cleaning systems, and extend the service life of reverse osmosis membranes, which can greatly reduce the operating costs of reverse osmosis systems. Reverse osmosis is the core technology of desalination, reclaimed water, sewage treatment and other water treatment industries. As the cost of reverse osmosis technology continues to decrease, the market of desalinated water and recycled water will continue to expand and reach into the tens of thousands of households Faster realization.
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