MBR membrane bioreactor process (MBR process) is a new wastewater treatment technology that combines membrane separation technology with biotechnology. It uses membrane separation equipment to retain activated sludge and large molecular organic substances in the biochemical reaction tank, eliminating the need for a secondary sedimentation tank. The concentration of activated sludge is greatly increased, and hydraulic retention time (HRT) and sludge retention time (SRT) can be controlled separately, while difficult to degrade substances continuously react and degrade in the reactor. Therefore, the membrane bioreactor process greatly enhances the functionality of bioreactors through membrane separation technology. Compared with traditional biological treatment methods, it has the advantages of high biochemical efficiency, strong resistance to load shock, stable effluent quality, small footprint, long sludge discharge cycle, and easy implementation of automatic control. It is currently one of the most promising new technologies for wastewater treatment. Since the 1990s, it has been widely researched and applied in countries such as Japan, France, and Canada.

Advantages of MBR process
1. Microbial concentration can increase by 2-4 times, and biochemical efficiency can be improved by 20-40%;
2. Short hydraulic retention time and long retention time of organic macromolecules in sludge;
3. Can eliminate the need for a secondary sedimentation tank;
4. Long sludge discharge cycle;
5. Easy to operate and controllable;
6. The service life of hollow fiber membranes can reach more than 3 years.

MBR process flow