Study on the Novel Non-Aeration Membrane Bioreactor

A novel non-aeration membrane bioreactor (N-MBR) is exploited based on the combination of bio-film process and membrane filtration process, of which the ceramic membrane module is made by the material of Al2O3. The relationship of the membrane diameter, the membrane flux, trans-membrane pressure (TMP) and the side stream velocity is investigated, as well as the treatment effect for domestic wastewater. The result shows that the N-MBR set-up with the membrane pore size of 1.5μm was adopted to treat the domestic wastewater under the condition of TMP 0.008MPa, side stream velocity 8m/min for continuous working 30 days. The effluent COD average concentration is less than 21mg/L and NH3-N concentration is less than 1mg/L all the time. The removal efficiency of COD and NH3-N is 85 percent and 98 percent respectively. The average energy consumption is 2.90± 0.55 kWh/m3 (permeate), which is reduced 50 percent than that of conventional membrane bioreactor.