Evaluation of extracellular biopolymer and its impact on bioflocculation in activated sludge bioreactors

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dc.contributor.author Ehlers, George en
dc.contributor.author Turner, Susan en
dc.date.accessioned 2012-03-06T20:05:21Z en
dc.date.issued 2011 en
dc.identifier.citation Water Science & Technology 63(4):689-694 2011 en
dc.identifier.issn 0273-1223 en
dc.identifier.uri http://hdl.handle.net/2292/13102 en
dc.description.abstract The influence and dynamics of bacterial extracellular polysaccharide (EPS) polymer production and its impact on bioflocculation in activated sludge (AS) bench-scale reactors were investigated. The impact of food to microorganism ratio (F/M), reactor configuration and easily biodegradable carbohydrates in influent streams on biological processes that support or weaken good floc formation and the link with EPS quantity was studied. Bioreactors were run as either sequencing batch or continuous systems using wastewater media with glucose or acetate as C source in different F/M ratios. EPS levels were quantified using mid-infrared spectroscopy which provided a rapid technique for monitoring biological processes within AS WWTP. The analysis revealed an interdependent link between EPS production, sludge settling characteristics and mode of reactor operation. An inverse relationship between F/M ratios and EPS quantities was seen but a positive link between EPS levels and aggregation indices, a measure of the efficiency of inter cell attachment and which indicates good settling properties, was also seen. This indicates that during high F/M conditions in lab-scale AS reactors, low levels of EPS may be produced which could have a negative impact on settling of the biomass. Floc architecture was examined under the microscope. Transient growth of filamentous bacteria was seen in the reactors. en
dc.language EN en
dc.publisher IWA Publishing en
dc.relation.ispartofseries Water Science & Technology en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0273-1223/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject activated sludge en
dc.subject aggregation en
dc.subject extracellular polysaccharide biopolymer en
dc.subject flocculation en
dc.subject sequencing batch reactor en
dc.subject FLOCCULATION en
dc.subject REACTOR en
dc.subject FLOCS en
dc.title Evaluation of extracellular biopolymer and its impact on bioflocculation in activated sludge bioreactors en
dc.type Journal Article en
dc.identifier.doi 10.2166/wst.2011.112 en
pubs.issue 4 en
pubs.begin-page 689 en
pubs.volume 63 en
dc.rights.holder Copyright: IWA Publishing en
dc.identifier.pmid 21330715 en
pubs.end-page 694 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 223080 en
pubs.record-created-at-source-date 2012-02-24 en
pubs.dimensions-id 21330715 en

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