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dc.contributor.authorWu, Wei-Min
dc.contributor.authorCarley, Jack
dc.contributor.authorLuo, Jian
dc.contributor.authorGinder-Vogel, Matthew A.
dc.contributor.authorCardenas, Erick
dc.contributor.authorLeigh, Mary Beth
dc.contributor.authorHwang, Chiachi
dc.contributor.authorKelly, Shelly D.
dc.contributor.authorRuan, Chuanmin
dc.contributor.authorWu, Liyou
dc.contributor.authorNostrand, Joy V.
dc.contributor.authorGentry, Terry J.
dc.contributor.authorLowe, K. A.
dc.contributor.authorMehlhorn, T. L.
dc.contributor.authorCarroll, Sue L.
dc.contributor.authorLuo, Wensui
dc.contributor.authorFields, Matthew W.
dc.contributor.authorGu, Baohua
dc.contributor.authorWatson, David B.
dc.contributor.authorKemner, K. M.
dc.contributor.authorMarsh, Terence
dc.contributor.authorTiedje, J. M.
dc.contributor.authorZhou, Jizhong
dc.contributor.authorFendorf, Scott
dc.contributor.authorKitanidis, Peter K.
dc.contributor.authorJardine, Phil M.
dc.contributor.authorCriddle, Craig S.
dc.date.accessioned2017-07-13T18:24:10Z
dc.date.available2017-07-13T18:24:10Z
dc.date.issued2007-08
dc.identifier.citationWu, WM, Carley J, Luo J, Ginder-Vogel MA, Cardenas E, Leigh MB, Hwang C, Kelly SD, Ruan C, Wu L, Van Nostrand J, Gentry T, Lowe K, Mehlhorn T, Carroll S, Luo W, Fields MW, et al, "In situ bioreduction of uranium (VI) in situ and stability of immobilized uranium: Impact of dissolved oxygen," Environ Sci Technol, 2007 41(16):5716-5723en_US
dc.identifier.issn0013-936X
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/13252
dc.description.abstractGroundwater within Area 3 of the U.S. Department of Energy (DOE) Environmental Remediation Sciences Program (ERSP) Field Research Center at Oak Ridge, TN (ORFRC) contains up to 135 microM uranium as U(VI). Through a series of experiments at a pilot scale test facility, we explored the lower limits of groundwater U(VI) that can be achieved by in-situ biostimulation and the effects of dissolved oxygen on immobilized uranium. Weekly 2-day additions of ethanol over a 2-year period stimulated growth of denitrifying, Fe(III)-reducing, and sulfate-reducing bacteria, and immobilization of uranium as U(IV), with dissolved uranium concentrations decreasing to low levels. Following sulfite addition to remove dissolved oxygen, aqueous U(VI) concentrations fell below the U.S. Environmental Protection Agengy maximum contaminant limit (MCL) for drinking water (< 30/microg L(-1) or 0.126 microM). Under anaerobic conditions, these low concentrations were stable, even in the absence of added ethanol. However, when sulfite additions stopped, and dissolved oxygen (4.0-5.5 mg L(-1)) entered the injection well, spatially variable changes in aqueous U(VI) occurred over a 60 day period, with concentrations increasing rapidly from < 0.13 to 2.0 microM at a multilevel sampling (MLS) well located close to the injection well, but changing little at an MLS well located further away. Resumption of ethanol addition restored reduction of Fe(III), sulfate, and U(VI) within 36 h. After 2 years of ethanol addition, X-ray absorption near-edge structure spectroscopy (XANES) analyses indicated that U(IV) comprised 60-80% of the total uranium in sediment samples. Atthe completion of the project (day 1260), U concentrations in MLS wells were less than 0.1 microM. The microbial community at MLS wells with low U(VI) contained bacteria that are known to reduce uranium, including Desulfovibrio spp. and Geobacter spp., in both sediment and groundwater. The dominant Fe(III)-reducing species were Geothrix spp.en_US
dc.titleIn situ bioreduction of uranium (VI) in situ and stability of immobilized uranium: Impact of dissolved oxygenen_US
dc.typeArticleen_US
mus.citation.extentfirstpage5716en_US
mus.citation.extentlastpage5723en_US
mus.citation.issue16en_US
mus.citation.journaltitleEnvironmental Science & Technologyen_US
mus.citation.volume41en_US
mus.identifier.categoryEngineering & Computer Scienceen_US
mus.identifier.doi10.1021/es062657ben_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.departmentChemical & Biological Engineering.en_US
mus.relation.departmentChemical Engineering.en_US
mus.relation.departmentMicrobiology & Immunology.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupCenter for Biofilm Engineering.en_US
mus.data.thumbpage5en_US
mus.contributor.orcidFields, Matthew W.|0000-0001-9053-1849en_US


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