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Relation between sludge properties and filterability in MBR: Under infinite SRT
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  • Journal title : Membrane Water Treatment
  • Volume 6, Issue 6,  2015, pp.501-512
  • Publisher : Techno-Press
  • DOI : 10.12989/mwt.2015.6.6.501
 Title & Authors
Relation between sludge properties and filterability in MBR: Under infinite SRT
Zhang, Haifeng; Wang, Bing; Yu, Haihuan; Zhang, Lanhe; Song, Lianfa;
 Abstract
A laboratory-scale submerged membrane bioreactor (MBR) was continuously operated for 100 d at an infinite sludge retention time (SRT) with the aim of identifying possible relation between the filterability of mixed liquor and sludge properties, such as extracellular polymeric substances (EPS), soluble microbial products (SMP), viscosity of mixed liquor, zeta potential of flocs and particle size distributions (PSD). Research results confirmed that MBR can operate with a complete sludge retention ensuring good treatment performances for COD and . However, the long term operation (about 40 d) of MBR with no sludge discharge had a negative influence on sludge filterability, and an increase in membrane fouling rates with the time was observed. There as a strong correlation between the sludge filterability and the fouling rate. Among the different sludge properties parameters, the concentration SMP and EPS had a more closely correlation with the sludge filterability. The concentrations of SMP, especially SMP with MW above 10 kDa, had a strong direct correlation to the filterability of mixed sludge. The protein fractions in EPS were biodegradable and available for microorganism metabolism after about 60 days, and the carbohydrates in EPS had a significantly negative effect on sludge filterability in MBR at an infinite SRT.
 Keywords
membrane bioreactor (MBR);sludge retention time (SRT);activated sludge;soluble microbial products (SMP);extracellular polymeric substances (EPS);
 Language
English
 Cited by
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Potential acute effects of suspended aluminum nitride (AlN) nanoparticles on soluble microbial products (SMP) of activated sludge, Journal of Environmental Sciences, 2017, 57, 284  crossref(new windwow)
2.
Assessing membrane biofouling and its gel layer of anoxic/oxic membrane bioreactor for megacity municipal wastewater treatment during plum rain season in Yangtze River Delta, China, Water Research, 2017, 127, 22  crossref(new windwow)
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