Microbial community developments and biomass characteristics in membrane bioreactors under different organic loadings |
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| Authors: | Wu Bing Yi Shan Fane Anthony G |
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| Institution: | a Singapore Membrane Technology Centre, Nanyang Technological University, Singapore 639798, Singapore
b Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA |
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| Abstract: | Microbial community developments and biomass characteristics (concentration, particle size, extracellular polymeric substances (EPS), and membrane fouling propensity) were compared when three MBRs were fed with the synthetic wastewater at different organic loadings. Results showed that the bacterial communities dynamically shifted in different ways and the EPS displayed dissimilar profiles under various organic loadings, which were associated with the ratios of food to microorganism and dissolved oxygen levels in the MBRs. The membrane fouling tendency of biomass in the low-loading MBR (0.57 g COD/L day) was insignificantly different from that in the medium-loading MBR (1.14 g COD/L day), which was apparently lower than that in the high-loading MBR (2.28 g COD/L day). The membrane fouling propensity of biomass was strongly correlated with their bound EPS contents, indicating cake layer fouling (i.e., deposition of microbial flocs) was predominant in membrane fouling at a high flux of 30 L/m2 h. |
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| Keywords: | Denaturing gradient gel electrophoresis Dissolved oxygen Extracellular polymeric substances Membrane fouling Ratio of food to microorganism |
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