A, (MBR) Overview membrane bioreactor (MBR) is a new water treatment technology by membrane separation unit with a combination of biological treatment unit to replace the secondary settling tank membrane to maintain a high concentration of activated sludge in the bioreactor reduce the area of ??sewage treatment facilities, and by maintaining a low sludge load reducing the amount of sludge. Compared with traditional biochemical water treatment technology, MBR has the following main features: high efficiency, good water quality; compact device, small footprint; easy to achieve automatic control, simple operation and management. Since the 1980s, the technology more and more attention, becoming one of the hot research. Currently membrane bioreactor has been used in more than ten countries, the United States, Germany, France and Egypt, in size from 6m3 / d to 13000m3 / d range. Second, the type of film classification film variety, can be classified according to the mechanism of structural separation, membrane properties and film. In the separating mechanism: reaction film, ion exchange membrane, permeable film. According to the nature of the film: a natural membrane (biofilm) and synthetic membranes (organic film and inorganic membranes). According to the type of film: a flat, tube, spiral type and hollow fiber type. Third, the process of MBR membrane separation technology combined with efficient biological treatment, and its origin is replaced by activated sludge secondary sedimentation tank with membrane separation technology for solid-liquid separation. This process not only effectively achieve the purpose of dewatering, and tertiary treatment of sewage traditional craft has unparalleled advantages: 1, efficient solid-liquid separation, the separation effect is much better than traditional sedimentation tanks, water quality is good, effluent suspended solids and turbidity is close to zero, can be directly reused to achieve the water resource. 2, effective interception film microbial completely trapped in the bioreactor to achieve reactor hydraulic retention time (HRT) and sludge age (SRT) is completely separated from operational control, flexibility and stability. 3, due to the aeration tank traditional MBR wastewater treatment combined with a secondary settling tank and replace the entire process tertiary treatment facility, thus significantly reducing the footprint, saving construction investment. 4, beneficial nitrifying bacteria retention and reproduction, high nitrification efficiency. By changing the operating mode may have ammonia and phosphorus removal capabilities. 5, due to the SRT can be very long, thus greatly improving the efficiency degradation of refractory organics. 6 reactor at high volume load, low sludge load, long SRT operation, sludge production is very low, due to be infinitely long sludge age, sludge can theoretically achieve zero emissions. 7, PLC control system implementation, operation and management easy