What is the working principle of membrane bioreactor MBR in sewage treatment?

Due to the existence of MBR membrane, the solid-liquid separation ability of the system is greatly improved, and the effluent, water quality and volume load of the system are greatly improved. The water quality standard after membrane treatment is high (exceeding the national first-class A standard), and after disinfection, high-quality reclaimed water with high water quality and biological safety is finally formed, which can be directly used as fresh water source.

Because of membrane filtration, microorganisms are completely trapped in MBR membrane bioreactor, which realizes the complete separation of hydraulic retention time and sludge age of activated sludge and eliminates the problem of sludge bulking in traditional activated sludge process. Membrane bioreactor has the advantages of high pollutant removal efficiency, strong nitrification capacity, good nitrification and denitrification effects, stable effluent quality, low excess sludge output, compact equipment, less occupied area (only 1/3- 1/2 of the traditional process), convenient incremental capacity expansion, high degree of automation and simple operation.