MBR is the abbreviation of membrane bioreactor, which is a modern water treatment technology integrating mechanical filtration, biodegradation and sludge thickening. Compared with the traditional activated sludge process, MBR has the advantages of high treatment efficiency, stable effluent quality, small space required, and low sludge output. The principle is to use the specially made membrane as the separation equipment between the bioreactor and the sedimentation tank. The sewage can obtain high-quality effluent through the screening of membrane pore size and the degradation of bacteria in the bioreactor. MBR plays a very important role in modern water treatment. First of all, the suspended solids, colloidal substances, biological flora and other organic substances in the sewage can be intercepted on the membrane surface and compressed into the sludge through the membrane, and the membrane pore size is very small (common pore size is 0.1-0.5 μ m) It can effectively filter organic matters in water and prevent pollutants from entering the next treatment unit. Secondly, in the bioreactor, organics in water are decomposed into small molecule organics and inorganic compounds through the processes of adsorption, growth, metabolism, decomposition and transformation of pollutants by microorganisms, so as to reduce the organic load in water to a certain extent and improve the quality of effluent and the self purification capacity of water. MBR has many advantages in water treatment process, such as strong stability, stable effluent quality, small reactor volume, high sludge quality, convenient operation, etc. For example, in the MBR system, because the ribs that exceed the forced filtration are formed at the center of the membrane, it is difficult for water to penetrate, and the concentrated flow at the outlet side produces highly concentrated sediment, which can improve the sludge quality. In addition, the advantage of MBR system treatment lies in that, because it uses process automation, it can better automate control, cooperate with modern operation control system, and can conduct pretreatment and pressure maintenance of water source to some extent, so as to give full play to the advantages of equipment and improve the efficiency and effect of environmental protection and water treatment. Finally, because the whole process of MBR technology is closed circuit, it reduces the interference of the external environment on the waterscape quality, reduces the fluctuation of water quality, and makes the water treatment process more stable. This is very important in urban sewage treatment, because urban sewage treatment plants are usually located in densely populated areas, the quality of sewage is vulnerable to external environmental factors, and additional pollutants such as waste gas and waste water caused by pollutant treatment usually affect the living environment of surrounding residents. Therefore, MBR's water purification technology not only plays a positive role in environmental protection for improving urban water environment, but also can reduce the negative impact of urban environmental pollution. to make a long story short, MBR membrane The key role in sewage treatment is embodied in physical filtration and biodegradation. The membrane filter can effectively filter suspended solids, high molecular organics, biological flora and other organics in the sewage to prevent them from entering the next treatment unit, thus improving the treatment efficiency; The microorganisms in the bioreactor have excellent adsorption, growth, metabolism, decomposition and transformation of pollutants, and can decompose organics into small molecule organics and inorganic substances, thus avoiding further secondary pollution of pollutants in the water. Therefore, MBR is becoming one of the core technologies of water treatment in this century.
