An aeration energy concentrator was installed in an ordinary aeration tank to separate it into three different reaction zones,as aerobic zone,membrane area,anoxic / anaerobic zone,and in this way,a new integrated A2/O-MBR was presented. The aeration energy efficiency was compared between the ordinary aeration tank and the new integration A2/O-MBR by the liquid velocity distribution test under different aeration intensities. The result showed that the aeration intensity of the new integration A2/O-MBR(3.5 m3...