The membrane bioreactor process has been considered to be a promising technology for wastewater treatment. In comparison with the conventional activated sludge process, this technology presents several advantages such as a small footprint, high quality effluent, a low sludge production rate and easy manipulation of the sludge retention time. However, membrane fouling, leading to decrease permeate flux or increase in operation and maintenance costs, is a major obstacle to the large-scale application of MBR process. In general [1], membrane fouling relates with three categories of factors, i.e. the membrane and module characteristics, feed and biomass parameters and operating conditions. Therefore, it may be possible to prevent membrane fouling before its occurrence by changing the characteristics of mixed liquor to limit its fouling propensity.