The full English name of MABR membrane oxygen transfer biofilm reactor is Membrane Aerated Biofilm Reactor. We also called MABR biological membrane .Its working principle is to utilize the synergistic effect between the selective breathable membrane and the attached growth-type biofilm. The breathable membrane is used to transmit oxygen to the biofilm attached to the surface of the breathable membrane, while the substrates such as ammonia and organic matter diffuse from the sewage into the biofilm. , While the MABR aerobic biofilm (with nitrifying bacteria as the dominant bacteria) installed in the anoxic tank and the denitrifying bacteria that grow in suspension in the anoxic zone achieve simultaneous nitrification and denitrification (SND) to strengthen the treatment of ammonia nitrogen and total nitrogen in sewage Removal.