MBR is a membrane bioreactor, which is a new sewage treatment technology combining membrane separation unit and biological treatment unit. It uses microfiltration membrane separation technology to replace the sedimentation tank and conventional filtration unit of traditional activated sludge method, so as to complete the separation of HRT and SRT. Therefore, it has high-efficiency solid-liquid separation performance, and uses the characteristics of membrane to make the activated sludge not lose with the flow of water. In the biochemical tank, it forms 8000-12000mg / L ultra-high activated sludge concentration, which makes the pollutants fully degraded, the water quality is good and stable, the bacteria, suspended solids and turbidity of the water are close to zero, and it can intercept the biological pollutants such as fecal coliform bacteria, etc. after treatment, the water can be directly returned Use.

Compared with the traditional process, it has the following main features: excellent and stable effluent quality; simple process; less floor area; less sludge discharge and small secondary pollution; strong impact resistance and wide range of application; high automation and simple management; modular design, which is easy to be combined freely according to the water quantity. From the current trend, the treatment of industrial wastewater and subsequent reuse of reclaimed water will be the main direction of MBR application in China.