This study was aimed to develop an enhanced MABR for the. treatment of surface water, analyzing the characteristics of mem-. brane modules and attached biofilm. The overall performance in the elimination of pollutants with the PHA addition was systematically. evaluated. It is proposed that hydrolytic-acidification, aerobic oxi-. dation, nitrification and denitrification could be completed in. the enhanced MABR process. Biomass would be increased with PHA supplemented. Then the concentrations of nitrogen and phosphorous contents could be reduced to a minimal level by. microbial assimilation. After operation for a certain period, the. whole enhanced MABR was removed to prevent the secondary. pollution. Surface water quality was substantially improved with. the integrated system. Results were directed for advancing the treatment of surface water by increasing the TN and TP removal. efficiency.