Journal
WATER RESEARCH
Volume 142, Issue -, Pages 480-489Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2018.06.003
Keywords
Waste activated sludge; Bound water; Dewatering; X-ray CMT; EPS
Funding
- Ministry of Science and Technology, P.R. China [2013ZX07315-002, 2017ZX07202-002]
- China Scholarship Council [201706260106]
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This study visually tracked the micro-spatial water distribution in bio-flocs of waste activated sludge through in situ synchrotron X-ray computed microtomography. Primarily, the two fractions of bound water, the vicinal water adhering to the surface of organic compositions and the interstitial water mechanically trapped in the net-like structure of bio-flocs, were proposed based on the cross-section imaging results. Furthermore, the determinants on bound water occurrences were explored in terms of viscoelastic acoustic responses of extracellular polymeric substances (EPS). The joint roles of hydrophilic substance removal, EPS aggregation compaction and colloidal instability of sludge flocs in bound water reduction were confirmed by the strong correlations (Pearson correlation coefficient, Rp > 0.95, pvalue<0.04) among protein levels of EPS, EPS viscosity and bound water contents. Accordingly, providing adhering sites for vicinal water and forming bio-flocs with high viscosity for trapping interstitial water were proposed to be the contributions of EPS on bound water occurrences. (C) 2018 Elsevier Ltd. All rights reserved.
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