Journal
BIORESOURCE TECHNOLOGY
Volume 122, Issue -, Pages 62-69Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.05.009
Keywords
Membrane bioreactor (MBR); Worm reactor; Membrane fouling; Soluble microbial products (SMP); Extracellular polymeric substances (EPS)
Funding
- National High-tech R&D Program (863 Program) of China [2009AA064704, 2007AA06Z348]
- National Natural Science Fund of China [50978071]
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [2011DX01]
- National Science Foundation of China [50821002]
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The study focused on the membrane fouling mitigation observed in a membrane bioreactor (MBR) coupled with worm reactor system. During the operation time of 100 days, the transmembrane pressure (IMP) in the combined system was maintained less than 5 kPa, while the final IMP in the Control-MBR increased to 30 kPa. The changes in properties of soluble microbial products (SMP) and extracellular polymeric substances (EPS) after worm predation were investigated by means of various analytical techniques. It was found that due to the worm predation, the reduced amount of EPS was far more than the increased amount of SMP leading to a significant decrease of protein-like substances which were dominant in the membrane foulants. Except for the content decrease, worm predation destroyed the functional groups of simple aromatic proteins and tryptophan protein-like substances in EPS, making them have lower tendency attaching to the membrane in the combined system. (C) 2012 Elsevier Ltd. All rights reserved.
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