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Article: Physical and hydrodynamic properties of aerobic granules produced in sequencing batch reactors

TitlePhysical and hydrodynamic properties of aerobic granules produced in sequencing batch reactors
Authors
KeywordsAerobic granules
Biological wastewater treatment
Fractal dimension
Permeability
Sequencing batch reactor (SBR)
Settling velocity
Issue Date2008
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/seppur
Citation
Separation And Purification Technology, 2008, v. 63 n. 3, p. 634-641 How to Cite?
AbstractThe structural and hydrodynamic properties of aerobic granules, such as their morphology, fractal dimension, porosity, size distribution, settling velocity, permeability, and shear strength, were characterized. Microbial granules were formed in two sequencing batch reactors (SBRs) that are used to treat glucose-based synthetic wastewater. The first SBR (R1) had a low pH of about 3.0, due to low influent alkalinity (28.7 mg CaCO3/L), and produced fungi-dominated granules. The second SBR (R2) had a pH of around 8.1, due to high influent alkalinity (301 mg CaCO3/L), and produced bacteria-dominated granules. The fungal granules were larger and weaker, with a loosely packed fluffy structure, whereas the bacterial granules were smaller and stronger and had a compact structure. The granules from both R1 and R2 were fractal aggregates, and they had fractal dimensions of 2.23 and 2.42, respectively. The settling velocities in water for the granules from R1 ranged from 0.38 to 2.67 cm/s. Those from R2 ranged from 0.42 to 3.21 cm/s. This is in good agreement with the settling velocities predicted by Stokes' law for porous but impermeable spheres. The fungal granules were almost completely impermeable, with an average fluid collection efficiency of 0.006, whereas the bacterial granules were slightly permeable, with an average fluid collection efficiency of 0.052. The results demonstrate that biomass enrichment in bioreactors can be achieved by the generation of dense and fast-settling sludge granules. By controlling the feeding condition, different types of aerobic granules can be produced with different structural features and hydrodynamic properties. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58507
ISSN
2015 Impact Factor: 3.299
2015 SCImago Journal Rankings: 1.100
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council (RGC) of the Hong Kong SAR GovernmentHKU7114/04E
N-HKU737/04
Funding Information:

This research was supported by grants HKU7114/04E and N-HKU737/04 from the Research Grants Council (RGC) of the Hong Kong SAR Government. The technical assistance of Mr. Keith C.H. Wong is greatly appreciated.

References

 

DC FieldValueLanguage
dc.contributor.authorXiao, Fen_HK
dc.contributor.authorYang, SFen_HK
dc.contributor.authorLi, XYen_HK
dc.date.accessioned2010-05-31T03:31:38Z-
dc.date.available2010-05-31T03:31:38Z-
dc.date.issued2008en_HK
dc.identifier.citationSeparation And Purification Technology, 2008, v. 63 n. 3, p. 634-641en_HK
dc.identifier.issn1383-5866en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58507-
dc.description.abstractThe structural and hydrodynamic properties of aerobic granules, such as their morphology, fractal dimension, porosity, size distribution, settling velocity, permeability, and shear strength, were characterized. Microbial granules were formed in two sequencing batch reactors (SBRs) that are used to treat glucose-based synthetic wastewater. The first SBR (R1) had a low pH of about 3.0, due to low influent alkalinity (28.7 mg CaCO3/L), and produced fungi-dominated granules. The second SBR (R2) had a pH of around 8.1, due to high influent alkalinity (301 mg CaCO3/L), and produced bacteria-dominated granules. The fungal granules were larger and weaker, with a loosely packed fluffy structure, whereas the bacterial granules were smaller and stronger and had a compact structure. The granules from both R1 and R2 were fractal aggregates, and they had fractal dimensions of 2.23 and 2.42, respectively. The settling velocities in water for the granules from R1 ranged from 0.38 to 2.67 cm/s. Those from R2 ranged from 0.42 to 3.21 cm/s. This is in good agreement with the settling velocities predicted by Stokes' law for porous but impermeable spheres. The fungal granules were almost completely impermeable, with an average fluid collection efficiency of 0.006, whereas the bacterial granules were slightly permeable, with an average fluid collection efficiency of 0.052. The results demonstrate that biomass enrichment in bioreactors can be achieved by the generation of dense and fast-settling sludge granules. By controlling the feeding condition, different types of aerobic granules can be produced with different structural features and hydrodynamic properties. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/seppuren_HK
dc.relation.ispartofSeparation and Purification Technologyen_HK
dc.subjectAerobic granulesen_HK
dc.subjectBiological wastewater treatmenten_HK
dc.subjectFractal dimensionen_HK
dc.subjectPermeabilityen_HK
dc.subjectSequencing batch reactor (SBR)en_HK
dc.subjectSettling velocityen_HK
dc.titlePhysical and hydrodynamic properties of aerobic granules produced in sequencing batch reactorsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1383-5866&volume=63&spage=634&epage=641&date=2008&atitle=Physical+and+hydrodynamic+properties+of+aerobic+granules+produced+in+sequencing+batch+reactorsen_HK
dc.identifier.emailLi, XY:xlia@hkucc.hku.hken_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.seppur.2008.07.002en_HK
dc.identifier.scopuseid_2-s2.0-53949084655en_HK
dc.identifier.hkuros164541en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-53949084655&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume63en_HK
dc.identifier.issue3en_HK
dc.identifier.spage634en_HK
dc.identifier.epage641en_HK
dc.identifier.isiWOS:000260805200018-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridXiao, F=7201709645en_HK
dc.identifier.scopusauthoridYang, SF=23089681900en_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK

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