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This study evaluated the impact of organic matter loads on membrane fouling in a submerged membrane bioreactor(MBR) for municipal wastewater treatment. Three membrane bioreactors were conducted with varying organic loading rates of COD 250, 500 and 750 mg/L. Protein and carbohydrate in EPS analyzed for finding the foulants characteristics on the passive adsorption. The results showed that the carbohydrates in eEPS and sEPS were low or hardly measured regardless of COD loads. It caused that the most of carbohydrates were exhausted for the microbial degradation. On the other hand, foulants in eEPS were almost protein, so it can be concluded that almost protein exist adsorbing on the surface of microbe. And high EPS concentration is attributed to the high COD loading rates, fouling by EPS increased as organic loading rates increased. Also, protein in eEPS decreased in Run 2 and Run 3 which was relatively high loading rate, due to extinct aerobic microbe by dissolved oxygen decreased in reactor. The increase of BAP(biomass associated products) leads the rising of protein concentration in sEPS. Also, the increase rate of permeability resistance at Run 1, 2 and 3 in the passive adsorption were 3.07E+09, 3.62E+09 and 4.14E+09, respectively, it found that permeability resistance would increase as COD load was higher.