Linking microbial community structure to membrane biofouling associated with varying dissolved oxygen concentrations |
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| Authors: | Gao Da-wen Fu Yuan Tao Yu Li Xin-xin Xing Min Gao Xiu-hong Ren Nan-qi |
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| Institution: | a State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
b School of Forestry, Northeast Forestry University, Harbin 150040, China |
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| Abstract: | In order to elucidate how dissolved oxygen (DO) concentration influenced the generation of extracellular polymeric substance (EPS) and soluble microbial products (SMP) in mixed liquor and biocake, 16S rDNA fingerprinting analyses were performed to investigate the variation of the microbial community in an aerobic membrane bioreactor (MBR). The function of microbial community structure was proved to be ultimately responsible for biofouling. Obvious microbial community succession from the subphylum of Betaproteobacteria to Deltaproteobacteria was observed in biocake. High concentration of EPS in biocake under the low DO concentration (0.5 mg L−1) caused severe biofouling. The correlation coefficient of membrane fouling rate with EPS content in biocake (0.9941-0.9964) was much higher than that in mixed liquor (0.6689-0.8004). |
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| Keywords: | Biofouling Dissolved oxygen Extracellular polymeric substance Microbial community |
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