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- W2029337336 abstract "Abstract In this study, the effect of sludge retention time (SRT) on membrane bio-fouling was investigated in a membrane bioreactor (MBR) equipped with a sequential anoxic/anaerobic reactor. Specific cake resistance (α), trans-membrane pressure (TMP), mixed liquor suspended solids (MLSS), particle sizes, extracellular polymer substances bound in sludge (bound-EPS) and their correlations with membrane bio-fouling were studied at different SRTs. As SRT decreased to 20 days, the bound-EPS per unit of biomass increased, and consequently, the value of α increased, which resulted in the rise of TMP. However, the reduction of the bound-EPS content was relatively small as compared to a significant decrease in the value of α at longer SRTs (above 60 days). These observations suggest that colloidal particles significantly contribute to membrane bio-fouling. In addition, the diversity of the microbial community structure of activated sludge in the MBRs was observed using the respiratory quinone profile. The ubiquinone species containing UQ-8, belonging to the class β-Proteobacteria type were the major constituents of the microbial community structure. The mole fraction of menaquinone MK-6, -7 and -8(H2) increased as SRT increased. Thus, the results of this study indicate that growth of microorganisms belonging to the δ- and ɛ-subclass of Proteobacteria as well as the members of the Cytophaga–Flavobacterium cluster increased at longer SRTs." @default.
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- W2029337336 date "2007-01-01" @default.
- W2029337336 modified "2023-10-07" @default.
- W2029337336 title "Effects of sludge retention time on membrane fouling and microbial community structure in a membrane bioreactor" @default.
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- W2029337336 doi "https://doi.org/10.1016/j.memsci.2006.10.036" @default.
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