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 |
POLYMERIC SUBSTANCES |
en |
dc.subject |
AEROBIC GRANULATION |
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 |