Journal
BIORESOURCE TECHNOLOGY
Volume 169, Issue -, Pages 213-219Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.06.099
Keywords
Membrane fouling; Specific filtration resistance; Surface tension; Interaction energy
Funding
- National Natural Science Foundation of China [51108424, 21207119]
- Open Project of Zhejiang Provincial Key Laboratory for Environmental Pollution Control Research
- Zhejiang Provincial Natural Science Foundation of China [LY13E080011]
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In this study, the fouling behaviors and surface properties of cake sludge and bulk sludge in a submerged membrane bioreactor (MBR) were investigated and compared. It was found that the specific filtration resistance (SFR) of cake sludge was about 5 times higher than that of bulk sludge. Two types of sludge possessed similar extracellular polymeric substances (EPS) content, particle size distribution (PSD) and zeta potential. However, their surface properties in terms of surface tensions were significantly different. Further analysis showed that cake sludge was more hydrophilic and had worse aggregation ability. Moreover, cake sludge surface possessed more hydrocarbon, less oxygen and nitrogen moieties than bulk sludge surface. It was suggested that, rather than EPS and PSD differences, the differences in the surface composition were the main cause of the great differences in SFR and adhesion ability between cake sludge and bulk sludge. (C) 2014 Elsevier Ltd. All rights reserved.
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