| Membrane aeration biofilm reactor (MABR) for the treatment of simulated domestic wastewater was studied here in laboratory scale. MABR is a novel combination wastewater treatment process, where gas-permeable membranes are applied to aeration. MABR is characterized by bubbleless aeration and special biofilm attached on the aerated membrane. Bubbleless aeration provides a high oxygen transfer rate and has a potential in treatment of high strength wastewater or wastewater containing volatile organic substances.The micro-porous hollow fiber membrane made by polypropylene acts as biofilm carrier as well as bubbleless aeration device. Its special character of transmission lies in that, due to great concentration gradient of dissolved oxygen and substance existing inside bio-film, nutrition and oxygen could penetrate into biofilm from opposite side of membrane. This character favors to achieving simultaneous nitrification and denitrification (SND).The removal efficiency of NH3-N, TN, COD and turbidity was determined. The corresponding best removal efficiency of NH3-N, TN, COD and turbidity obtained are 79.29%, 71.29%, 77.65% and 93.68%. The results show that the parameters such as dissolved oxygen (DO), ratio of nitrogen (C/N), F/M, influent concentration, pH and pressure of aeration have an important effect on the performance of MABR. The best efficiency of SND can be achieved, when the following conditions were used: DO concentration, 1.0mg/L; pH, neutrality or alkalescence; C/N, 4～5 .The TN removal efficiency increases during enhancing F/M.
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