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Article: Autotrophic denitrification and its effect on metal speciation during marine sediment remediation

TitleAutotrophic denitrification and its effect on metal speciation during marine sediment remediation
Authors
KeywordsAutotrophic denitrification
AVS–SEM
Heavy metals
Remediation
Sequential extraction
Issue Date2009
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 2009, v. 43 n. 12, p. 2961-2968 How to Cite?
AbstractDenitrification-based remediation has been proved as a cost-effective approach for organic removal in sediment. However, little attention has been drawn on the concomitant autotrophic denitrification process and its impacts during such treatment. In this study, a contaminated marine sediment sample was treated with nitrate in a series of experiments to characterize the autotrophic denitrification and its impacts on metal speciation. Through treatment, as the consequence of autotrophic denitrification which accounts for 73.9% of nitrate reduction, ∼98.8% acid volatile sulfide (AVS) was oxidized to sulfate, causing changes of Zn, Cu and Pb speciation in the sediment. Their oxidizable fractions decreased by 71.7%, 13% and 71% respectively while the bound-to-carbonate fractions increased by 52.0%, >700% and >40%, and the reducible fractions also increased by 276%, >280% and 140%. Thus, the relatively stable oxidizable phase of Zn, Cu and Pb was generally transferred to the more mobile bound-to-carbonate and reducible phases. According to SEM (simultaneously extracted metal) analysis, most of extractable Zn and Pb were no longer present in the form of metal sulfides after denitrification. The (Zn + Pb)/AVS ratio increased from 0.030 to 3.1. Both sequential extraction and AVS-SEM suggested a possible increase of heavy metal mobility and, thus, toxicity. Two major species responsible for autotrophic denitrification were identified to be phylogenetically related with Sulfurimonas paralvinellae and Thiohalophilus thiocyanoxidans. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/124538
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Research Grants CouncilHKU7122/08E
Funding Information:

The authors wish to thank the Hong Kong Research Grants Council for the financial support of this study (HKU7122/08E), and Mingfei Shao wishes to thank HKU for the postgraduate studentship.

References

 

DC FieldValueLanguage
dc.contributor.authorShao, Men_HK
dc.contributor.authorZhang, Ten_HK
dc.contributor.authorFang, HHPen_HK
dc.date.accessioned2010-10-31T10:40:11Z-
dc.date.available2010-10-31T10:40:11Z-
dc.date.issued2009en_HK
dc.identifier.citationWater Research, 2009, v. 43 n. 12, p. 2961-2968en_HK
dc.identifier.issn0043-1354en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124538-
dc.description.abstractDenitrification-based remediation has been proved as a cost-effective approach for organic removal in sediment. However, little attention has been drawn on the concomitant autotrophic denitrification process and its impacts during such treatment. In this study, a contaminated marine sediment sample was treated with nitrate in a series of experiments to characterize the autotrophic denitrification and its impacts on metal speciation. Through treatment, as the consequence of autotrophic denitrification which accounts for 73.9% of nitrate reduction, ∼98.8% acid volatile sulfide (AVS) was oxidized to sulfate, causing changes of Zn, Cu and Pb speciation in the sediment. Their oxidizable fractions decreased by 71.7%, 13% and 71% respectively while the bound-to-carbonate fractions increased by 52.0%, >700% and >40%, and the reducible fractions also increased by 276%, >280% and 140%. Thus, the relatively stable oxidizable phase of Zn, Cu and Pb was generally transferred to the more mobile bound-to-carbonate and reducible phases. According to SEM (simultaneously extracted metal) analysis, most of extractable Zn and Pb were no longer present in the form of metal sulfides after denitrification. The (Zn + Pb)/AVS ratio increased from 0.030 to 3.1. Both sequential extraction and AVS-SEM suggested a possible increase of heavy metal mobility and, thus, toxicity. Two major species responsible for autotrophic denitrification were identified to be phylogenetically related with Sulfurimonas paralvinellae and Thiohalophilus thiocyanoxidans. © 2009 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watresen_HK
dc.relation.ispartofWater Researchen_HK
dc.subjectAutotrophic denitrification-
dc.subjectAVS–SEM-
dc.subjectHeavy metals-
dc.subjectRemediation-
dc.subjectSequential extraction-
dc.subject.meshAutotrophic Processesen_HK
dc.subject.meshBiodegradation, Environmentalen_HK
dc.subject.meshCopper - analysis - metabolismen_HK
dc.subject.meshGeologic Sediments - analysis - chemistry - microbiologyen_HK
dc.subject.meshLead - analysis - metabolismen_HK
dc.subject.meshMetals, Heavy - analysis - metabolismen_HK
dc.subject.meshNitrates - chemistryen_HK
dc.subject.meshNitriles - chemistryen_HK
dc.subject.meshNitrogen - chemistry - metabolismen_HK
dc.subject.meshZinc - analysis - metabolismen_HK
dc.titleAutotrophic denitrification and its effect on metal speciation during marine sediment remediationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0043-1354&volume=43&issue=12&spage=2961&epage=2968&date=2009&atitle=Autotrophic+denitrification+and+its+effect+on+metal+speciation+during+marine+sediment+remediationen_HK
dc.identifier.emailZhang, T:zhangt@hkucc.hku.hken_HK
dc.identifier.emailFang, HHP:hrechef@hkucc.hku.hken_HK
dc.identifier.authorityZhang, T=rp00211en_HK
dc.identifier.authorityFang, HHP=rp00115en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.watres.2009.04.016en_HK
dc.identifier.pmid19476962-
dc.identifier.scopuseid_2-s2.0-70149102994en_HK
dc.identifier.hkuros175511en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70149102994&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume43en_HK
dc.identifier.issue12en_HK
dc.identifier.spage2961en_HK
dc.identifier.epage2968en_HK
dc.identifier.isiWOS:000267580500002-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridShao, M=34868583400en_HK
dc.identifier.scopusauthoridZhang, T=24470677400en_HK
dc.identifier.scopusauthoridFang, HHP=7402542625en_HK

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