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Article: Uranium sequestration in sediment at an iron-rich contaminated site at Oak Ridge, Tennessee via. bioreduction followed by reoxidation

TitleUranium sequestration in sediment at an iron-rich contaminated site at Oak Ridge, Tennessee via. bioreduction followed by reoxidation
Authors
KeywordsSediments
Uranium
Sequestration
Bioreduction
Reoxidation
Issue Date2019
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/709941/description#description
Citation
Journal of Environmental Sciences, 2019, v. 85, p. 156-167 How to Cite?
AbstractThis study evaluated uranium sequestration performance in iron-rich (30 g/kg) sediment via bioreduction followed by reoxidation. Field tests (1383 days) at Oak Ridge, Tennessee demonstrated that uranium contents in sediments increased after bioreduced sediments were re-exposed to nitrate and oxygen in contaminated groundwater. Bioreduction of contaminated sediments (1200 mg/kg U) with ethanol in microcosm reduced aqueous U from 0.37 to 0.023 mg/L. Aliquots of the bioreduced sediment were reoxidized with O2, H2O2, and NaNO3, respectively, over 285 days, resulting in aqueous U of 0.024, 1.58 and 14.4 mg/L at pH 6.30, 6.63 and 7.62, respectively. The source- and the three reoxidized sediments showed different desorption and adsorption behaviors of U, but all fit a Freundlich model. The adsorption capacities increased sharply at pH 4.5 to 5.5, plateaued at pH 5.5 to 7.0, then decreased sharply as pH increased from 7.0 to 8.0. The O2-reoxidized sediment retained a lower desorption efficiency at pH over 6.0. The NO3−-reoxidized sediment exhibited higher adsorption capacity at pH 5.5 to 6.0. The pH-dependent adsorption onto Fe(III) oxides and formation of U coated particles and precipitates resulted in U sequestration, and bioreduction followed by reoxidation can enhance the U sequestration in sediment.
Persistent Identifierhttp://hdl.handle.net/10722/293671
ISSN
2023 Impact Factor: 5.9
2023 SCImago Journal Rankings: 1.422
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLi, PS-
dc.contributor.authorWu, WM-
dc.contributor.authorPhillips, DH-
dc.contributor.authorWatson, DB-
dc.contributor.authorKelly, S-
dc.contributor.authorLi, B-
dc.contributor.authorMehlhorn, T-
dc.contributor.authorLowe, K-
dc.contributor.authorEarles, J-
dc.contributor.authorTao, HC-
dc.contributor.authorZhang, T-
dc.contributor.authorCriddle, CS-
dc.date.accessioned2020-11-23T08:20:08Z-
dc.date.available2020-11-23T08:20:08Z-
dc.date.issued2019-
dc.identifier.citationJournal of Environmental Sciences, 2019, v. 85, p. 156-167-
dc.identifier.issn1001-0742-
dc.identifier.urihttp://hdl.handle.net/10722/293671-
dc.description.abstractThis study evaluated uranium sequestration performance in iron-rich (30 g/kg) sediment via bioreduction followed by reoxidation. Field tests (1383 days) at Oak Ridge, Tennessee demonstrated that uranium contents in sediments increased after bioreduced sediments were re-exposed to nitrate and oxygen in contaminated groundwater. Bioreduction of contaminated sediments (1200 mg/kg U) with ethanol in microcosm reduced aqueous U from 0.37 to 0.023 mg/L. Aliquots of the bioreduced sediment were reoxidized with O2, H2O2, and NaNO3, respectively, over 285 days, resulting in aqueous U of 0.024, 1.58 and 14.4 mg/L at pH 6.30, 6.63 and 7.62, respectively. The source- and the three reoxidized sediments showed different desorption and adsorption behaviors of U, but all fit a Freundlich model. The adsorption capacities increased sharply at pH 4.5 to 5.5, plateaued at pH 5.5 to 7.0, then decreased sharply as pH increased from 7.0 to 8.0. The O2-reoxidized sediment retained a lower desorption efficiency at pH over 6.0. The NO3−-reoxidized sediment exhibited higher adsorption capacity at pH 5.5 to 6.0. The pH-dependent adsorption onto Fe(III) oxides and formation of U coated particles and precipitates resulted in U sequestration, and bioreduction followed by reoxidation can enhance the U sequestration in sediment.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/709941/description#description-
dc.relation.ispartofJournal of Environmental Sciences-
dc.subjectSediments-
dc.subjectUranium-
dc.subjectSequestration-
dc.subjectBioreduction-
dc.subjectReoxidation-
dc.titleUranium sequestration in sediment at an iron-rich contaminated site at Oak Ridge, Tennessee via. bioreduction followed by reoxidation-
dc.typeArticle-
dc.identifier.emailZhang, T: zhangt@hkucc.hku.hk-
dc.identifier.authorityZhang, T=rp00211-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jes.2019.05.028-
dc.identifier.pmid31471022-
dc.identifier.scopuseid_2-s2.0-85067463048-
dc.identifier.hkuros319419-
dc.identifier.volume85-
dc.identifier.spage156-
dc.identifier.epage167-
dc.identifier.isiWOS:000483934300016-
dc.publisher.placeNetherlands-
dc.identifier.issnl1001-0742-

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