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Article: Hydrodynamics of biological aggregates of different sludge ages: An insight into the mass transport mechanisms of bioaggregates

TitleHydrodynamics of biological aggregates of different sludge ages: An insight into the mass transport mechanisms of bioaggregates
Authors
Issue Date2003
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/est
Citation
Environmental Science And Technology, 2003, v. 37 n. 2, p. 292-299 How to Cite?
AbstractInternal permeation and its role in mass transport to biological aggregates are investigated through detailed settling experiments. Three groups of bacterial aggregates (0.8-3.2 mm), which were different in fractal dimension and porosity, were generated in batch activated sludge reactors with biomass residence times (BRTs) of 5, 10, and 20 days. An apparatus of vertically connected double settling columns, which were filled respectively with water and an EDTA solution of a higher density, was used to characterize the settling and permeability features of individual aggregates. The settling velocities observed in water were in good agreement with those predicted by Stokes' law for porous but impermeable aggregates. The BRT10 and BRT20 aggregates, with porosities that were generally less than 0.92, had fluid collection efficiencies ranging from 0 to 0.1, while the BRT5 aggregates with porosities that were generally higher than 0.97 were almost completely impermeable. It is suggested that bioaggregates with either a tightly or a loosely packed structure cannot be as highly permeable as characterized for nonbiological fractal aggregates. While falling from water into the denser EDTA liquid, many BRT10 and BRT20 aggregates stopped and stayed below the interface of the two liquids for a period that was more than an order of magnitude shorter than the prediction based on the assumption of molecular diffusion as the predominant mass transport mechanism to the aggregates. The results indicate that limited intra-aggregate convection, which may not be important to the hydrodynamic properties of bioaggregates, could significantly enhance mass transport to suspended aggregates in biological wastewater treatment reactors.
DescriptionComment in Environ Sci Technol. 2003 Sep 1;37(17):4017; author reply 4018-4019.
Persistent Identifierhttp://hdl.handle.net/10722/71419
ISSN
2015 Impact Factor: 5.393
2015 SCImago Journal Rankings: 2.664
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, XYen_HK
dc.contributor.authorYuan, Yen_HK
dc.contributor.authorWang, HWen_HK
dc.date.accessioned2010-09-06T06:31:49Z-
dc.date.available2010-09-06T06:31:49Z-
dc.date.issued2003en_HK
dc.identifier.citationEnvironmental Science And Technology, 2003, v. 37 n. 2, p. 292-299en_HK
dc.identifier.issn0013-936Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/71419-
dc.descriptionComment in Environ Sci Technol. 2003 Sep 1;37(17):4017; author reply 4018-4019.-
dc.description.abstractInternal permeation and its role in mass transport to biological aggregates are investigated through detailed settling experiments. Three groups of bacterial aggregates (0.8-3.2 mm), which were different in fractal dimension and porosity, were generated in batch activated sludge reactors with biomass residence times (BRTs) of 5, 10, and 20 days. An apparatus of vertically connected double settling columns, which were filled respectively with water and an EDTA solution of a higher density, was used to characterize the settling and permeability features of individual aggregates. The settling velocities observed in water were in good agreement with those predicted by Stokes' law for porous but impermeable aggregates. The BRT10 and BRT20 aggregates, with porosities that were generally less than 0.92, had fluid collection efficiencies ranging from 0 to 0.1, while the BRT5 aggregates with porosities that were generally higher than 0.97 were almost completely impermeable. It is suggested that bioaggregates with either a tightly or a loosely packed structure cannot be as highly permeable as characterized for nonbiological fractal aggregates. While falling from water into the denser EDTA liquid, many BRT10 and BRT20 aggregates stopped and stayed below the interface of the two liquids for a period that was more than an order of magnitude shorter than the prediction based on the assumption of molecular diffusion as the predominant mass transport mechanism to the aggregates. The results indicate that limited intra-aggregate convection, which may not be important to the hydrodynamic properties of bioaggregates, could significantly enhance mass transport to suspended aggregates in biological wastewater treatment reactors.en_HK
dc.languageengen_HK
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/esten_HK
dc.relation.ispartofEnvironmental Science and Technologyen_HK
dc.subject.meshBiomass-
dc.subject.meshBioreactors-
dc.subject.meshSewage - chemistry - microbiology-
dc.subject.meshWaste Disposal, Fluid-
dc.subject.meshWater Pollutants, Chemical - analysis-
dc.titleHydrodynamics of biological aggregates of different sludge ages: An insight into the mass transport mechanisms of bioaggregatesen_HK
dc.typeArticleen_HK
dc.identifier.emailLi, XY:xlia@hkucc.hku.hken_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/es020764+en_HK
dc.identifier.pmid12564900-
dc.identifier.scopuseid_2-s2.0-0037439044en_HK
dc.identifier.hkuros75996en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037439044&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume37en_HK
dc.identifier.issue2en_HK
dc.identifier.spage292en_HK
dc.identifier.epage299en_HK
dc.identifier.isiWOS:000180501500013-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK
dc.identifier.scopusauthoridYuan, Y=36553559300en_HK
dc.identifier.scopusauthoridWang, HW=36071773400en_HK

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