and required advanced chemical oxidation [7] or adsorption [8]processes. Biological treatment can also partially remove them but their removal efficiencies are generally found to be low to moderatedue to the fact that several of the emerging contaminants are rel-atively resistant to biodegradation. The study varied from naturalecosystems [9] to mechanical based wastewater treatment system[10,11]. Among several newly developed wastewater treatmentprocesses, membrane bioreactors (MBRs) is reported as an effective wastewater treatment system in removal of hardly biodegradable or toxic organic compounds and there fore has become a goodoption for the treatment of municipal solid waste leachate thatcontains hazardous organic compounds [12,13]. In MBR, biologicaltreatment is conducted under unique environmental condition inwhich microorganisms are maintained at much higher concentra-tions when compared to other conventional biological treatment processes. Meanwhile, membrane filtration has provided addi-tional barrier for pollutant removal after biological treatment.These combined biological and physico-chemical processes hasyielded much better removal efficiency of micro-pollutants bothwith hydrophobic or hydrophilic properties [12]. MBR can alsoenhance the biodegradation of toxic organic compounds whenoperating under long sludge age condition and long-term operation