TY - JOUR
T1 - Soluble microbial products in membrane bioreactor operation
T2 - Behaviors, characteristics, and fouling potential
AU - Liang, Shuang
AU - Liu, Cui
AU - Song, Lianfa
PY - 2007/1
Y1 - 2007/1
N2 - 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.
AB - 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.
KW - Accumulation
KW - Characteristics
KW - Fouling potential
KW - Membrane bioreactor
KW - Sludge retention time
KW - Soluble microbial products
UR - http://www.scopus.com/inward/record.url?scp=34548030148&partnerID=8YFLogxK
U2 - 10.1016/j.watres.2006.10.008
DO - 10.1016/j.watres.2006.10.008
M3 - Article
C2 - 17109912
AN - SCOPUS:34548030148
VL - 41
SP - 95
EP - 101
JO - Water Research
JF - Water Research
SN - 0043-1354
IS - 1
ER -