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论文类型：期刊论文

发表时间：2010-10-01

发表刊物：WATER RESEARCH

收录刊物：SCIE、EI、PubMed、Scopus

卷号：44

期号：18

页面范围：5407-5413

ISSN号：0043-1354

关键字：Membrane bioreactor; Variable organic loading; Membrane fouling; EPS

摘要：The aim of this study is to compare the effect of constant and variable influent organic loadings on membrane fouling in submerged membrane bioreactors (sMBRs). Two identical lab-scale sMBRs were operated for 162 days at an SRT of 30 days, whereas the influent organic loading was kept constant in one MBR, and varied in another. The microbial characteristics of sludge in terms of MLSS, bound EPS, EPS in the supernatant and particle size distribution were investigated in order to evaluate their respective effect on membrane fouling. During the start-up period, membrane fouling in the MBR fed with variable loadings was more serious than that in the MBR with the constant loading. However, at the stable state, the fouling tendency was clearly reversed with less membrane fouling for variable feed strength. It was shown that the contents of polysaccharides in the supernatant and particle size of the bioflocs were responsible for the observed differences in the fouling tendencies of the two MBRs. (C) 2010 Elsevier Ltd. All rights reserved.