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Application of microbial indices to assess the performance of an SBR and MBR treating municipal wastewater

Horan, NJ, Monsalvo, VM and Shanmugam, P (2012) Application of microbial indices to assess the performance of an SBR and MBR treating municipal wastewater. Environmental Technology, 33 (18). 2143 - 2148. ISSN 0959-3330


Microbial indexes of filamentous bacterial density were evaluated for their potential to act as indicators of sludge settling characteristics for SBR and MBR treatment options. These options were operated using settled sewage over a range of aerated loading rates from 0.05 to 0.4/d and the evolution of protozoan and metazoan populations analysed. A filament density score ranging between 0 and 5 that has previously been applied to conventional activated sludge processes, was shown also to be a useful tool for SBR and MBR, and was correlated to the settleability of the mixed liquor from both reactors. Due to the hydrodynamics of both systems and the subsequent differences in mixed liquors, optimum performance for each bioreactor was obtained under different operating conditions. Although there was no correlation between the numbers of any given protozoan species and plant operating conditions, there was a clear dependence between operating conditions and protozoan diversity. The highest diversity was found when operating conditions were optimum for both the SBR and MBR.

Item Type: Article
Keywords: Membrane bioreactor; sequencing batch reactor; municipal wastewater; microbial community
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds) > Inst for Pathogen Control Engineering (Leeds)
Depositing User: Symplectic Publications
Date Deposited: 08 Mar 2012 10:46
Last Modified: 04 Dec 2014 17:45
Published Version: http://dx.doi.org/10.1080/09593330.2012.660652
Status: Published
Publisher: Taylor & Francis
Identification Number: 10.1080/09593330.2012.660652
URI: http://eprints.whiterose.ac.uk/id/eprint/43756

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