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Title: Soluble microbial products in membrane bioreactor operation: Behaviors, characteristics, and fouling potential
Authors: Liang, S.
Liu, C.
Song, L. 
Keywords: Accumulation
Fouling potential
Membrane bioreactor
Sludge retention time
Soluble microbial products
Issue Date: Jan-2007
Citation: Liang, S., Liu, C., Song, L. (2007-01). Soluble microbial products in membrane bioreactor operation: Behaviors, characteristics, and fouling potential. Water Research 41 (1) : 95-101. ScholarBank@NUS Repository.
Abstract: This paper presents an experimental study on soluble microbial products (SMP) in membrane bioreactor (MBR) operation at different sludge retention times (SRTs). A laboratory-scale MBR was operated at SRT of 10, 20, and 40 days for treatment of readily biodegradable synthetic wastewater. The accumulation, composition, characteristics, and fouling potential of SMP at each SRT were examined. It was found that accumulation of SMP in the MBR became more pronounced at short SRTs. Carbohydrates and proteins appeared to be the components of SMP prone to accumulate in the MBR compared with aromatic compounds. The proportions of SMP with large molecular weight in supernatants and in effluents were almost identical, implying that membrane sieving did not work for most SMP. In addition, the majority of SMP was found to be composed of hydrophobic components, whose proportion in total SMP gradually increased as SRT lengthened. However, fouling potentials of SMP were relatively low at long SRTs. The hydrophilic neutrals (e.g., carbohydrates) were most likely the main foulants responsible for high fouling potentials of SMP observed at short SRTs. © 2006 Elsevier Ltd. All rights reserved.
Source Title: Water Research
ISSN: 00431354
Appears in Collections:Staff Publications

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