2015•Journal of Food Science and BiotechnologyRequires access

Effect of Aeration Intensity on the Components of Extracellular Polymeric Substances and Their Distribution in Membrane Bioreactor System

Chen Chunme

Abstract

In this study,the effect of aeration intensity on specific oxygen utilization rate(SOUR),the content of extracellular polymeric substances(EPS) and their distribution during synthetic wastewater treating was investigated in membrane bioreactor(MBR) system. The results showed that SOUR was increased and the EPS content in the MBR supernatant dropped by increasing the aeration intensity,but it didn't change much in sludge. The EPS both in supernatant and sludge were dominated by polysaccharides. However,the EPS content in membrane fouling layer increased along with the aeration intensity and was mainly consisted of proteins. The membrane-fouling rate was in proportion to the proteins/polysaccharides ratio in soluble EPS of the mixed liquid.

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Key concepts: Extracellular polymeric substance, Aeration, Membrane bioreactor, Chemistry, Membrane fouling, Bioreactor, Fouling, Chromatography