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Intermolecular interactions of polysaccharides in membrane fouling during microfiltration.

Authors
  • Meng, Shujuan1
  • Fan, Wenhong2
  • Li, Xiaomin2
  • Liu, Yu3
  • Liang, Dawei4
  • Liu, Xiaoxing2
  • 1 School of Space and Environment, Beihang University, Beijing 100191, PR China. Electronic address: [email protected] , (China)
  • 2 School of Space and Environment, Beihang University, Beijing 100191, PR China. , (China)
  • 3 Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore, 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore. , (Singapore)
  • 4 School of Space and Environment, Beihang University, Beijing 100191, PR China. Electronic address: [email protected] , (China)
Type
Published Article
Journal
Water research
Publication Date
Oct 15, 2018
Volume
143
Pages
38–46
Identifiers
DOI: 10.1016/j.watres.2018.06.027
PMID: 29940360
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Membrane technology has been widely employed for seawater desalination, water and wastewater reclamation, while membrane fouling still remains as a major challenge. The polysaccharides in extracellular polymeric substances (EPS) have been recognized as an important foulant that causes serious membrane fouling, while the detailed structure of polysaccharides and the intermolecular interactions between them have not been adequately disclosed. In this study, two different polysaccharides and their mixtures were used to study the intermolecular cross-linking of polysaccharides as well as its effects on membrane fouling. Results demonstrated that the fouling propensities of distinct polysaccharides were completely different, which was attributed to the different intermolecular interactions lying in polysaccharides. The cross-linking among molecules of polysaccharide, regardless of the homogeneity, was found to form complex networks and determine the effective dimension of polysaccharides. Depending on the effective dimension of foulants, pore blocking and cake layer occurred subsequently during filtration processes. In light of this, it potentially gives new insights into the fouling behaviours by combining the structure-function knowledge of polysaccharides with their fouling propensity. In addition, transparent exopolymeric particles (TEP) measurement was found to provide an intuitionistic evaluation of the complex networks formed from polysaccharides, so that may act as a good indicator of fouling during membrane filtration. Copyright © 2018 Elsevier Ltd. All rights reserved.

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