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Article: Experimental investigation of the effect of flow turbulence and sediment transport patterns on the adsorption of cadmium ions onto sediment particles

TitleExperimental investigation of the effect of flow turbulence and sediment transport patterns on the adsorption of cadmium ions onto sediment particles
Authors
Issue Date2007
PublisherI O S Press. The Journal's web site is located at http://www.iospress.nl/html/10010742.php
Citation
Journal Of Environmental Sciences, 2007, v. 19 n. 6, p. 696-703 How to Cite?
AbstractThe mechanism of flow turbulence, sediment supply conditions, and sediment transport patterns that affect the adsorption of cadmium ions onto sediment particles in natural waters are experimentally simulated and studied both in batch reactors and in a turbulence simulation tank. By changing the agitation conditions, the sediment transport in batch reactors can be categorized into bottom sediment-dominated sediment and suspended sediment-dominated sediment. It is found that the adsorption rate of bottom sediment is much less than that of suspended sediment, but the sediment transport pattern does not affect the final (equilibrium) concentration of dissolved cadmium. This result indicates that the parameters of an adsorption isotherm are the same regardless of the sediment transport pattern. In the turbulence simulation tank, the turbulence is generated by harmonic grid-stirred motions, and the turbulence intensity is quantified in terms of eddy diffusivity, which is equal to 9.84F (F is the harmonic vibration frequency) and is comparable to natural surface water conditions. When the turbulence intensity of flow is low and sediment particles stay as bottom sediment, the adsorption rate is significantly low, and the adsorption quantity compared with that of suspended sediment is negligible in the 6 h duration of the experiment. This result greatly favors the simplification of the numerical modeling of heavy metal pollutant transformation in natural rivers. When the turbulence intensity is high but bottom sediment persists, the rate and extent of descent of the dissolved cadmium concentration in the tank noticeably increase, and the time that is required to reach adsorption equilibrium also increases considerably due to the continuous exchange that occurs between the suspended sediment and the bottom sediment. A comparison of the results of the experiments in the batch reactor and those in the turbulence simulation tank reveals that the adsorption ability of the sediment, and in particular the adsorption rate, is greatly over-estimated in the batch reactor. © 2007 The Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences.
Persistent Identifierhttp://hdl.handle.net/10722/75622
ISSN
2015 Impact Factor: 2.208
2015 SCImago Journal Rankings: 0.832
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHUANG, Slen_HK
dc.contributor.authorNG, Coen_HK
dc.contributor.authorGUO, Qzen_HK
dc.date.accessioned2010-09-06T07:12:58Z-
dc.date.available2010-09-06T07:12:58Z-
dc.date.issued2007en_HK
dc.identifier.citationJournal Of Environmental Sciences, 2007, v. 19 n. 6, p. 696-703en_HK
dc.identifier.issn1001-0742en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75622-
dc.description.abstractThe mechanism of flow turbulence, sediment supply conditions, and sediment transport patterns that affect the adsorption of cadmium ions onto sediment particles in natural waters are experimentally simulated and studied both in batch reactors and in a turbulence simulation tank. By changing the agitation conditions, the sediment transport in batch reactors can be categorized into bottom sediment-dominated sediment and suspended sediment-dominated sediment. It is found that the adsorption rate of bottom sediment is much less than that of suspended sediment, but the sediment transport pattern does not affect the final (equilibrium) concentration of dissolved cadmium. This result indicates that the parameters of an adsorption isotherm are the same regardless of the sediment transport pattern. In the turbulence simulation tank, the turbulence is generated by harmonic grid-stirred motions, and the turbulence intensity is quantified in terms of eddy diffusivity, which is equal to 9.84F (F is the harmonic vibration frequency) and is comparable to natural surface water conditions. When the turbulence intensity of flow is low and sediment particles stay as bottom sediment, the adsorption rate is significantly low, and the adsorption quantity compared with that of suspended sediment is negligible in the 6 h duration of the experiment. This result greatly favors the simplification of the numerical modeling of heavy metal pollutant transformation in natural rivers. When the turbulence intensity is high but bottom sediment persists, the rate and extent of descent of the dissolved cadmium concentration in the tank noticeably increase, and the time that is required to reach adsorption equilibrium also increases considerably due to the continuous exchange that occurs between the suspended sediment and the bottom sediment. A comparison of the results of the experiments in the batch reactor and those in the turbulence simulation tank reveals that the adsorption ability of the sediment, and in particular the adsorption rate, is greatly over-estimated in the batch reactor. © 2007 The Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences.en_HK
dc.languageengen_HK
dc.publisherI O S Press. The Journal's web site is located at http://www.iospress.nl/html/10010742.phpen_HK
dc.relation.ispartofJournal of Environmental Sciencesen_HK
dc.rightsJournal of Environmental Sciences. Copyright © I O S Press.en_HK
dc.subject.meshAdsorptionen_HK
dc.subject.meshCadmium - chemistryen_HK
dc.subject.meshGeologic Sediments - chemistryen_HK
dc.subject.meshWater Movementsen_HK
dc.subject.meshWater Pollutants, Chemical - chemistryen_HK
dc.titleExperimental investigation of the effect of flow turbulence and sediment transport patterns on the adsorption of cadmium ions onto sediment particlesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1001-0742&volume=19&issue=6&spage=696–703&epage=&date=2007&atitle=Experimental+investigation+of+the+effect+of+flow+turbulence+and+sediment+transport+patterns+on+the+adsorption+of+cadmium+ions+onto+sediment+particlesen_HK
dc.identifier.emailNG, Co:cong@hku.hken_HK
dc.identifier.authorityNG, Co=rp00224en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S1001-0742(07)60116-8en_HK
dc.identifier.pmid17969642-
dc.identifier.scopuseid_2-s2.0-34249881651en_HK
dc.identifier.hkuros127745en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34249881651&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume19en_HK
dc.identifier.issue6en_HK
dc.identifier.spage696en_HK
dc.identifier.epage703en_HK
dc.identifier.isiWOS:000247251700011-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridHUANG, Sl=24437506400en_HK
dc.identifier.scopusauthoridNG, Co=7401705594en_HK
dc.identifier.scopusauthoridGUO, Qz=35098519300en_HK

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