1, anoxic, anaerobic and aerobic three different environmental conditions and the organic cooperation of different kinds of microbial flora can simultaneously remove organic matter, nitrogen and phosphorus, and the total hydraulic retention time is low;

2. Under anaerobic-anoxic-aerobic alternate operation, filamentous bacteria will not multiply in large quantities, and SVI is generally less than 100, so sludge sedimentation performance is good and sludge bulking will not occur;

3. Because MBR membrane has an efficient separation function, there is no need to establish separate separation tanks such as sedimentation and filtration, so it occupies a small area;

4.A2O+MBR membrane is often blocked, and the frequency of cleaning agent is high, which is easy to cause membrane loss and affect the service life of membrane.