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Article: Effects of humic acid on physical and hydrodynamic properties of kaolin flocs by particle image velocimetry

TitleEffects of humic acid on physical and hydrodynamic properties of kaolin flocs by particle image velocimetry
Authors
KeywordsFloc restructuring
Floc strength
Fractal dimension
Humic acid
Particle image velocimetry
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 2011, v. 45 n. 13, p. 3981-3990 How to Cite?
AbstractThe physical and hydrodynamic properties of kaolin flocs including floc size, strength, regrowth, fractal structure and settling velocity were investigated by in situ particle image velocimetry technique at different humic acid concentration. Jar-test experimental results showed that the adsorbed humic acid had a significant influence on the coagulation process for alum and ferric chloride. Kaolin flocs formed with the ferric chloride were larger and stronger than those for alum at same humic acid concentration. Floc strength and regrowth were estimated by strength factor and recovery factor at different humic acid concentration. It was found that the increased humic acid concentration had a slight influence on the strength of kaolin flocs and resulted in much worse floc regrowth. In addition, the floc regrowth after breakage depended on the shear history and coagulants under investigation. The changes in fractal structure recorded continuously by in situ particle image velocimetry technique during the growth-breakage-regrowth processes provided a supporting information that the kaolin flocs exhibited a multilevel structure. It was proved that the increased humic acid concentration resulted in decrease in mass fractal dimension of kaolin flocs and consequently worse sedimentation performance through free-settling and microbalance techniques. © 2011 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/137239
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID
Funding AgencyGrant Number
National Natural Science Foundation of China20721140019
U0773002
Funding Information:

This work was supported by the National Natural Science Foundation of China (No. 20721140019, U0773002). The technical assistances of Mr. Keith C. H. Wong and Mr. C. H. Tong, comments and suggestions from anonymous reviewers are greatly appreciated.

References

 

DC FieldValueLanguage
dc.contributor.authorZhong, Ren_HK
dc.contributor.authorZhang, Xen_HK
dc.contributor.authorXiao, Fen_HK
dc.contributor.authorLi, Xen_HK
dc.contributor.authorCai, Zen_HK
dc.date.accessioned2011-08-26T14:21:39Z-
dc.date.available2011-08-26T14:21:39Z-
dc.date.issued2011en_HK
dc.identifier.citationWater Research, 2011, v. 45 n. 13, p. 3981-3990en_HK
dc.identifier.issn0043-1354en_HK
dc.identifier.urihttp://hdl.handle.net/10722/137239-
dc.description.abstractThe physical and hydrodynamic properties of kaolin flocs including floc size, strength, regrowth, fractal structure and settling velocity were investigated by in situ particle image velocimetry technique at different humic acid concentration. Jar-test experimental results showed that the adsorbed humic acid had a significant influence on the coagulation process for alum and ferric chloride. Kaolin flocs formed with the ferric chloride were larger and stronger than those for alum at same humic acid concentration. Floc strength and regrowth were estimated by strength factor and recovery factor at different humic acid concentration. It was found that the increased humic acid concentration had a slight influence on the strength of kaolin flocs and resulted in much worse floc regrowth. In addition, the floc regrowth after breakage depended on the shear history and coagulants under investigation. The changes in fractal structure recorded continuously by in situ particle image velocimetry technique during the growth-breakage-regrowth processes provided a supporting information that the kaolin flocs exhibited a multilevel structure. It was proved that the increased humic acid concentration resulted in decrease in mass fractal dimension of kaolin flocs and consequently worse sedimentation performance through free-settling and microbalance techniques. © 2011 Elsevier Ltd.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watresen_HK
dc.relation.ispartofWater Researchen_HK
dc.subjectFloc restructuringen_HK
dc.subjectFloc strengthen_HK
dc.subjectFractal dimensionen_HK
dc.subjectHumic aciden_HK
dc.subjectParticle image velocimetryen_HK
dc.subject.meshFlocculation-
dc.subject.meshHumic Substances - analysis-
dc.subject.meshKaolin - chemistry-
dc.subject.meshRheology - methods-
dc.subject.meshWater Purification - methods-
dc.titleEffects of humic acid on physical and hydrodynamic properties of kaolin flocs by particle image velocimetryen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0043-1354&volume=45&issue=13&spage=3981&epage=3990&date=2011&atitle=Effects+of+humic+acid+on+physical+and+hydrodynamic+properties+of+kaolin+flocs+by+particle+image+velocimetry-
dc.identifier.emailLi, X:xlia@hkucc.hku.hken_HK
dc.identifier.authorityLi, X=rp00222en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.watres.2011.05.006en_HK
dc.identifier.pmid21641012-
dc.identifier.scopuseid_2-s2.0-79959336931en_HK
dc.identifier.hkuros190470en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79959336931&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume45en_HK
dc.identifier.issue13en_HK
dc.identifier.spage3981en_HK
dc.identifier.epage3990en_HK
dc.identifier.isiWOS:000292947800019-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhong, R=24170418700en_HK
dc.identifier.scopusauthoridZhang, X=36112333200en_HK
dc.identifier.scopusauthoridXiao, F=35243870400en_HK
dc.identifier.scopusauthoridLi, X=26642887900en_HK
dc.identifier.scopusauthoridCai, Z=35228842700en_HK
dc.identifier.citeulike9370046-

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