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

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TitleAutotrophic denitrification and its effect on metal speciation during marine sediment remediation
AuthorsShao, M1
Zhang, T1
Fang, HHP1
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
CitationWater Research, 2009, v. 43 n. 12, p. 2961-2968 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.watres.2009.04.016
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.
ISSN0043-1354
2011 Impact Factor: 4.865
2011 SCImago Journal Rankings: 0.234
DOIhttp://dx.doi.org/10.1016/j.watres.2009.04.016
ISI Accession Number IDWOS:000267580500002
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.

ReferencesReferences in Scopus
DC Field
Value
dc.contributor.authorShao, M
dc.contributor.authorZhang, T
dc.contributor.authorFang, HHP
dc.date.accessioned2010-10-31T10:40:11Z
dc.date.available2010-10-31T10:40:11Z
dc.date.issued2009
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.
dc.description.natureLink_to_subscribed_fulltext
dc.identifier.citationWater Research, 2009, v. 43 n. 12, p. 2961-2968 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.watres.2009.04.016
dc.identifier.doihttp://dx.doi.org/10.1016/j.watres.2009.04.016
dc.identifier.epage2968
dc.identifier.hkuros175511
dc.identifier.isiWOS:000267580500002
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.

dc.identifier.issn0043-1354
2011 Impact Factor: 4.865
2011 SCImago Journal Rankings: 0.234
dc.identifier.issue12
dc.identifier.openurl
dc.identifier.pmid19476962
dc.identifier.scopuseid_2-s2.0-70149102994
dc.identifier.spage2961
dc.identifier.urihttp://hdl.handle.net/10722/124538
dc.identifier.volume43
dc.languageeng
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
dc.publisher.placeUnited Kingdom
dc.relation.ispartofWater Research
dc.relation.referencesReferences in Scopus
dc.subject.meshAutotrophic Processes
dc.subject.meshBiodegradation, Environmental
dc.subject.meshCopper - analysis - metabolism
dc.subject.meshGeologic Sediments - analysis - chemistry - microbiology
dc.subject.meshLead - analysis - metabolism
dc.subject.meshMetals, Heavy - analysis - metabolism
dc.subject.meshNitrates - chemistry
dc.subject.meshNitriles - chemistry
dc.subject.meshNitrogen - chemistry - metabolism
dc.subject.meshZinc - analysis - metabolism
dc.subjectAutotrophic denitrification
dc.subjectAVS–SEM
dc.subjectHeavy metals
dc.subjectRemediation
dc.subjectSequential extraction
dc.titleAutotrophic denitrification and its effect on metal speciation during marine sediment remediation
dc.typeArticle
Author Affiliations
  1. The University of Hong Kong