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Article: Characterization of the flocculation process from the evolution of particle size distributions

TitleCharacterization of the flocculation process from the evolution of particle size distributions
Authors
KeywordsCoagulation
Flocculation
Imaging Techniques
Particle Size Distribution
Particles
Water Treatment
Issue Date2008
PublisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/ee.html
Citation
Journal of Environmental Engineering, 2008, v. 134 n. 5, p. 369-375 How to Cite?
AbstractA flocculator-imaging system was developed to characterize the dynamics of particle size distribution (PSD) during flocculation. The system consisted of a flocculator coupled with an external flow-through cell for observation and photography, a microscopic charge-coupled device video recorder with backlighting, and an image analyzer. This nonintrusive side-stream setup was used to record the evolution of the PSD to determine the flocculation dynamics of three types of particle systems: Clean kaolin, kaolin coated with natural organic matter (NOM), and the kaolin/NOM system after ozonation. In addition to the PSD measurement, the potential, NOM reduction, and turbidity removal after the jar test of flocculation and sedimentation were determined for the particle systems at various alum dosages. The results of the -potential analysis and the PSD measurement indicated that flocculation takes place rapidly to form highly porous aggregates when the particle surface charge is fully neutralized. The adsorption of NOM on the particle surface stabilized the particles considerably, and thus hindered the flocculation process. Sweep flocculation using a much higher alum dosage was an effective means of process enhancement for the removal of particulates and associated organic matter. Ozonation of the kaolin/NOM solution, however, did not appear to have any positive effect on particle destabilization and flocculation. It is argued that ozonation produced more acidic functional groups in the NOM on kaolin, which increased the surface charge density and hence the stability of the particles in softer water. © 2008 ASCE.
Persistent Identifierhttp://hdl.handle.net/10722/150451
ISSN
2015 Impact Factor: 1.125
2015 SCImago Journal Rankings: 0.462
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, XYen_US
dc.contributor.authorZhai, Xen_US
dc.contributor.authorChu, HPen_US
dc.contributor.authorZhang, Jen_US
dc.date.accessioned2012-06-26T06:04:52Z-
dc.date.available2012-06-26T06:04:52Z-
dc.date.issued2008en_US
dc.identifier.citationJournal of Environmental Engineering, 2008, v. 134 n. 5, p. 369-375en_US
dc.identifier.issn0733-9372en_US
dc.identifier.urihttp://hdl.handle.net/10722/150451-
dc.description.abstractA flocculator-imaging system was developed to characterize the dynamics of particle size distribution (PSD) during flocculation. The system consisted of a flocculator coupled with an external flow-through cell for observation and photography, a microscopic charge-coupled device video recorder with backlighting, and an image analyzer. This nonintrusive side-stream setup was used to record the evolution of the PSD to determine the flocculation dynamics of three types of particle systems: Clean kaolin, kaolin coated with natural organic matter (NOM), and the kaolin/NOM system after ozonation. In addition to the PSD measurement, the potential, NOM reduction, and turbidity removal after the jar test of flocculation and sedimentation were determined for the particle systems at various alum dosages. The results of the -potential analysis and the PSD measurement indicated that flocculation takes place rapidly to form highly porous aggregates when the particle surface charge is fully neutralized. The adsorption of NOM on the particle surface stabilized the particles considerably, and thus hindered the flocculation process. Sweep flocculation using a much higher alum dosage was an effective means of process enhancement for the removal of particulates and associated organic matter. Ozonation of the kaolin/NOM solution, however, did not appear to have any positive effect on particle destabilization and flocculation. It is argued that ozonation produced more acidic functional groups in the NOM on kaolin, which increased the surface charge density and hence the stability of the particles in softer water. © 2008 ASCE.en_US
dc.languageengen_US
dc.publisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/ee.htmlen_US
dc.relation.ispartofJournal of Environmental Engineeringen_US
dc.rightsJournal of Environmental Engineering. Copyright © American Society of Civil Engineers.-
dc.subjectCoagulationen_US
dc.subjectFlocculationen_US
dc.subjectImaging Techniquesen_US
dc.subjectParticle Size Distributionen_US
dc.subjectParticlesen_US
dc.subjectWater Treatmenten_US
dc.titleCharacterization of the flocculation process from the evolution of particle size distributionsen_US
dc.typeArticleen_US
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0733-9372&volume=134&spage=369&epage=375&date=2008&atitle=Characterization+of+flocculation+dynamics+from+the+evolution+of+particle+size+distributions-
dc.identifier.emailLi, XY: xlia@hkucc.hku.hken_US
dc.identifier.emailChu, HP: hiupingchu@yahoo.com-
dc.identifier.authorityLi, XY=rp00222en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1061/(ASCE)0733-9372(2008)134:5(369)en_US
dc.identifier.scopuseid_2-s2.0-42549172325en_US
dc.identifier.hkuros149605-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-42549172325&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume134en_US
dc.identifier.issue5en_US
dc.identifier.spage369en_US
dc.identifier.epage375en_US
dc.identifier.isiWOS:000255418000006-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridLi, XY=26642887900en_US
dc.identifier.scopusauthoridZhai, XD=11640497900en_US
dc.identifier.scopusauthoridChu, HP=36870373000en_US
dc.identifier.scopusauthoridZhang, JJ=24081952200en_US

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