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Moon JW, Paradis CJ, Joyner DC, von Netzer F, Majumder EL, Dixon ER, Podar M, Ge X, Walian PJ, Smith HJ, Wu X, Zane GM, Walker KF, Thorgersen MP, Poole Ii FL, Lui LM, Adams BG, De León KB, Brewer SS, Williams DE, Lowe KA, Rodriguez M, Mehlhorn TL, Pfiffner SM, Chakraborty R, Arkin AP, Wall JD, Fields MW, Adams MWW, Stahl DA, Elias DA, Hazen TC. Characterization of subsurface media from locations up- and down-gradient of a uranium-contaminated aquifer. CHEMOSPHERE 2020; 255:126951. [PMID: 32417512 DOI: 10.1016/j.chemosphere.2020.126951] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 04/17/2020] [Accepted: 04/29/2020] [Indexed: 06/11/2023]
Abstract
The processing of sediment to accurately characterize the spatially-resolved depth profiles of geophysical and geochemical properties along with signatures of microbial density and activity remains a challenge especially in complex contaminated areas. This study processed cores from two sediment boreholes from background and contaminated core sediments and surrounding groundwater. Fresh core sediments were compared by depth to capture the changes in sediment structure, sediment minerals, biomass, and pore water geochemistry in terms of major and trace elements including pollutants, cations, anions, and organic acids. Soil porewater samples were matched to groundwater level, flow rate, and preferential flows and compared to homogenized groundwater-only samples from neighboring monitoring wells. Groundwater analysis of nearby wells only revealed high sulfate and nitrate concentrations while the same analysis using sediment pore water samples with depth was able to suggest areas high in sulfate- and nitrate-reducing bacteria based on their decreased concentration and production of reduced by-products that could not be seen in the groundwater samples. Positive correlations among porewater content, total organic carbon, trace metals and clay minerals revealed a more complicated relationship among contaminant, sediment texture, groundwater table, and biomass. The fluctuating capillary interface had high concentrations of Fe and Mn-oxides combined with trace elements including U, Th, Sr, Ba, Cu, and Co. This suggests the mobility of potentially hazardous elements, sediment structure, and biogeochemical factors are all linked together to impact microbial communities, emphasizing that solid interfaces play an important role in determining the abundance of bacteria in the sediments.
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Affiliation(s)
- Ji-Won Moon
- Oak Ridge National Laboratory, Biosciences Division, Oak Ridge, TN, USA; current U.S. Geological Survey, National Minerals Information Center, Reston, VA, USA
| | - Charles J Paradis
- University of Tennessee, Departments of Earth & Planetary Sciences, Microbiology, Civil & Environmental Engineering, Methane Center, Knoxville, TN, USA
| | - Dominique C Joyner
- University of Tennessee, Departments of Earth & Planetary Sciences, Microbiology, Civil & Environmental Engineering, Methane Center, Knoxville, TN, USA
| | - Frederick von Netzer
- University of Washington, Department of Civil and Environmental Engineering, Seattle, WA, USA
| | - Erica L Majumder
- University of Missouri, Department of Biochemistry, Columbia, MO, USA
| | - Emma R Dixon
- University of Tennessee, Departments of Earth & Planetary Sciences, Microbiology, Civil & Environmental Engineering, Methane Center, Knoxville, TN, USA
| | - Mircea Podar
- Oak Ridge National Laboratory, Biosciences Division, Oak Ridge, TN, USA
| | - Xiaoxuan Ge
- University of Georgia, Department of Biochemistry and Molecular Biology, Athens, GA, USA
| | - Peter J Walian
- Lawrence Berkeley National Laboratory, Molecular Biophysics and Integrated Bioimaging, Berkeley, CA, USA
| | - Heidi J Smith
- Montana State University, Center for Biofilm Engineering, Department of Microbiology & Immunology, Bozeman, MT, USA
| | - Xiaoqin Wu
- Lawrence Berkeley National Laboratory, Department of Ecology, Earth and Environmental Sciences Area, Berkeley, CA, USA
| | - Grant M Zane
- University of Missouri, Department of Biochemistry, Columbia, MO, USA
| | - Kathleen F Walker
- University of Tennessee, Departments of Earth & Planetary Sciences, Microbiology, Civil & Environmental Engineering, Methane Center, Knoxville, TN, USA
| | - Michael P Thorgersen
- University of Georgia, Department of Biochemistry and Molecular Biology, Athens, GA, USA
| | - Farris L Poole Ii
- University of Georgia, Department of Biochemistry and Molecular Biology, Athens, GA, USA
| | - Lauren M Lui
- Lawrence Berkeley National Laboratory Environmental Genomics and Systems Biology, Berkeley, CA, USA
| | - Benjamin G Adams
- University of Tennessee, Departments of Earth & Planetary Sciences, Microbiology, Civil & Environmental Engineering, Methane Center, Knoxville, TN, USA
| | - Kara B De León
- University of Missouri, Department of Biochemistry, Columbia, MO, USA
| | - Sheridan S Brewer
- University of Tennessee, Departments of Earth & Planetary Sciences, Microbiology, Civil & Environmental Engineering, Methane Center, Knoxville, TN, USA
| | - Daniel E Williams
- University of Tennessee, Departments of Earth & Planetary Sciences, Microbiology, Civil & Environmental Engineering, Methane Center, Knoxville, TN, USA
| | - Kenneth A Lowe
- Oak Ridge National Laboratory, Environmental Science Division, Oak Ridge, TN, USA
| | - Miguel Rodriguez
- Oak Ridge National Laboratory, Biosciences Division, Oak Ridge, TN, USA
| | - Tonia L Mehlhorn
- Oak Ridge National Laboratory, Environmental Science Division, Oak Ridge, TN, USA
| | - Susan M Pfiffner
- University of Tennessee, Departments of Earth & Planetary Sciences, Microbiology, Civil & Environmental Engineering, Methane Center, Knoxville, TN, USA
| | - Romy Chakraborty
- Lawrence Berkeley National Laboratory, Department of Ecology, Earth and Environmental Sciences Area, Berkeley, CA, USA
| | - Adam P Arkin
- Lawrence Berkeley National Laboratory Environmental Genomics and Systems Biology, Berkeley, CA, USA
| | - Judy D Wall
- University of Missouri, Department of Biochemistry, Columbia, MO, USA
| | - Matthew W Fields
- Montana State University, Center for Biofilm Engineering, Department of Microbiology & Immunology, Bozeman, MT, USA
| | - Michael W W Adams
- University of Georgia, Department of Biochemistry and Molecular Biology, Athens, GA, USA
| | - David A Stahl
- University of Washington, Department of Civil and Environmental Engineering, Seattle, WA, USA
| | - Dwayne A Elias
- Oak Ridge National Laboratory, Biosciences Division, Oak Ridge, TN, USA
| | - Terry C Hazen
- Oak Ridge National Laboratory, Biosciences Division, Oak Ridge, TN, USA; University of Tennessee, Departments of Earth & Planetary Sciences, Microbiology, Civil & Environmental Engineering, Methane Center, Knoxville, TN, USA.
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2
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Zelaya AJ, Parker AE, Bailey KL, Zhang P, Van Nostrand J, Ning D, Elias DA, Zhou J, Hazen TC, Arkin AP, Fields MW. High spatiotemporal variability of bacterial diversity over short time scales with unique hydrochemical associations within a shallow aquifer. WATER RESEARCH 2019; 164:114917. [PMID: 31387058 DOI: 10.1016/j.watres.2019.114917] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 07/24/2019] [Accepted: 07/25/2019] [Indexed: 06/10/2023]
Abstract
Understanding microbial community structure and function within the subsurface is critical to assessing overall quality and maintenance of groundwater; however, the factors that determine microbial community assembly, structure, and function in groundwater systems and their impact on water quality remains poorly understood. In this study, three shallow wells (FW301, FW303, FW305) in a non-contaminated shallow aquifer in the ENIGMA-Oak Ridge Field Research Center (Oak Ridge, TN) were sampled approximately 3 times a week over a period of three months to measure changes in groundwater geochemistry and microbial diversity. It was expected that the sampled microbial diversity from two historic field wells (FW301, FW303) would be relatively stable, while diversity from a newer well (FW305) would be less stable over time. The wells displayed some degree of hydrochemical variability over time unique to each well, with FW303 being overall the most stable well and FW301 being the most dynamic based upon dissolved oxygen, conductivity, and nitrate. Community analysis via ss-rRNA paired-end sequencing and distribution-based clustering revealed higher OTU richness, diversity, and variability in groundwater communities of FW301 than the other two wells for diversity binned over all time points. Microbial community composition of a given well was on average > 50% dissimilar to any other well at a given time (days), yet, functional gene diversity as measured with GeoChip remained relatively constant. Similarities in community structure across wells were observed with respect to the presence of 20 shared bacterial groups in all samples in all wells, although at varying levels over the tested time period. Similarity percentage (SIMPER) analysis revealed that variability in FW301 was largely attributed to low abundance, highly-transient populations, while variability in the most hydrochemically stable well (FW303) was due to fluctuations in more highly abundant and frequently present taxa. Additionally, the youngest well FW305 showed a dramatic shift in community composition towards the end of the sampling period that was not observed in the other wells, suggesting possible succession events over time. Time-series analysis using vector auto-regressive models and Granger causality showed unique relationships between richness and geochemistry over time in each well. These results indicate temporally dynamic microbial communities over short time scales, with day-to-day population shifts in local community structure influenced by available source community diversity and local groundwater hydrochemistry.
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Affiliation(s)
- Anna J Zelaya
- Center for Biofilm Engineering, Montana State University, Bozeman, MT, USA; Department of Microbiology & Immunology, Montana State University, Bozeman, MT, USA
| | - Albert E Parker
- Center for Biofilm Engineering, Montana State University, Bozeman, MT, USA; Department of Mathematical Sciences, Montana State University, Bozeman, MT, USA
| | - Kathryn L Bailey
- Division of Environmental Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Ping Zhang
- Institute for Environmental Genomics, University of Oklahoma, Norman, OK, USA
| | - Joy Van Nostrand
- Institute for Environmental Genomics, University of Oklahoma, Norman, OK, USA
| | - Daliang Ning
- Institute for Environmental Genomics, University of Oklahoma, Norman, OK, USA
| | - Dwayne A Elias
- Division of Environmental Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Jizhong Zhou
- Institute for Environmental Genomics, University of Oklahoma, Norman, OK, USA
| | - Terry C Hazen
- Department of Civil and Environmental Engineering, University of Tennesee, Knoxville, TN, USA
| | - Adam P Arkin
- Department of Bioengineering, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Matthew W Fields
- Center for Biofilm Engineering, Montana State University, Bozeman, MT, USA; Department of Microbiology & Immunology, Montana State University, Bozeman, MT, USA.
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Christensen GA, Moon J, Veach AM, Mosher JJ, Wymore AM, van Nostrand JD, Zhou J, Hazen TC, Arkin AP, Elias DA. Use of in-field bioreactors demonstrate groundwater filtration influences planktonic bacterial community assembly, but not biofilm composition. PLoS One 2018; 13:e0194663. [PMID: 29558522 PMCID: PMC5860781 DOI: 10.1371/journal.pone.0194663] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 03/07/2018] [Indexed: 02/01/2023] Open
Abstract
Using in-field bioreactors, we investigated the influence of exogenous microorganisms in groundwater planktonic and biofilm microbial communities as part of the Integrated Field Research Challenge (IFRC). After an acclimation period with source groundwater, bioreactors received either filtered (0.22 μM filter) or unfiltered well groundwater in triplicate and communities were tracked routinely for 23 days after filtration was initiated. To address geochemical influences, the planktonic phase was assayed periodically for protein, organic acids, physico-/geochemical measurements and bacterial community (via 16S rRNA gene sequencing), while biofilms (i.e. microbial growth on sediment coupons) were targeted for bacterial community composition at the completion of the experiment (23 d). Based on Bray-Curtis distance, planktonic bacterial community composition varied temporally and between treatments (filtered, unfiltered bioreactors). Notably, filtration led to an increase in the dominant genus, Zoogloea relative abundance over time within the planktonic community, while remaining relatively constant when unfiltered. At day 23, biofilm communities were more taxonomically and phylogenetically diverse and substantially different from planktonic bacterial communities; however, the biofilm bacterial communities were similar regardless of filtration. These results suggest that although planktonic communities were sensitive to groundwater filtration, bacterial biofilm communities were stable and resistant to filtration. Bioreactors are useful tools in addressing questions pertaining to microbial community assembly and succession. These data provide a first step in understanding how an extrinsic factor, such as a groundwater inoculation and flux of microbial colonizers, impact how microbial communities assemble in environmental systems.
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Affiliation(s)
- Geoff A. Christensen
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - JiWon Moon
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Allison M. Veach
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Jennifer J. Mosher
- Marshall University, Biological Sciences, Huntington, West Virginia, United States of America
| | - Ann M. Wymore
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | | | - Jizhong Zhou
- University of Oklahoma, Norman, Oklahoma, United States of America
| | - Terry C. Hazen
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
- University of Tennessee, Knoxville, Tennessee, United States of America
| | - Adam P. Arkin
- Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
- University of California at Berkeley, Berkeley, California, United States of America
| | - Dwayne A. Elias
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
- * E-mail:
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4
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Liu H, Cheng W, Wang M, Meng T. Investigation of U(VI) desorption behavior from natural sediment, Oak Ridge. J Radioanal Nucl Chem 2017. [DOI: 10.1007/s10967-017-5384-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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5
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Hemme CL, Tu Q, Shi Z, Qin Y, Gao W, Deng Y, Nostrand JDV, Wu L, He Z, Chain PSG, Tringe SG, Fields MW, Rubin EM, Tiedje JM, Hazen TC, Arkin AP, Zhou J. Comparative metagenomics reveals impact of contaminants on groundwater microbiomes. Front Microbiol 2015; 6:1205. [PMID: 26583008 PMCID: PMC4628106 DOI: 10.3389/fmicb.2015.01205] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 10/16/2015] [Indexed: 11/15/2022] Open
Abstract
To understand patterns of geochemical cycling in pristine versus contaminated groundwater ecosystems, pristine shallow groundwater (FW301) and contaminated groundwater (FW106) samples from the Oak Ridge Integrated Field Research Center (OR-IFRC) were sequenced and compared to each other to determine phylogenetic and metabolic difference between the communities. Proteobacteria (e.g., Burkholderia, Pseudomonas) are the most abundant lineages in the pristine community, though a significant proportion ( >55%) of the community is composed of poorly characterized low abundance (individually <1%) lineages. The phylogenetic diversity of the pristine community contributed to a broader diversity of metabolic networks than the contaminated community. In addition, the pristine community encodes redundant and mostly complete geochemical cycles distributed over multiple lineages and appears capable of a wide range of metabolic activities. In contrast, many geochemical cycles in the contaminated community appear truncated or minimized due to decreased biodiversity and dominance by Rhodanobacter populations capable of surviving the combination of stresses at the site. These results indicate that the pristine site contains more robust and encodes more functional redundancy than the stressed community, which contributes to more efficient nutrient cycling and adaptability than the stressed community.
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Affiliation(s)
- Christopher L Hemme
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman OK, USA
| | - Qichao Tu
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman OK, USA
| | - Zhou Shi
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman OK, USA
| | - Yujia Qin
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman OK, USA
| | - Weimin Gao
- The Biodesign Institute, Arizona State University, Tempe AZ, USA
| | - Ye Deng
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman OK, USA ; CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences Beijing, China
| | - Joy D Van Nostrand
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman OK, USA
| | - Liyou Wu
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman OK, USA
| | - Zhili He
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman OK, USA
| | - Patrick S G Chain
- Bioscience Division, Los Alamos National Laboratory, Los Alamos NM, USA
| | - Susannah G Tringe
- United States Department of Energy, Joint Genome Institute, Walnut Creek CA, USA
| | - Matthew W Fields
- Department of Microbiology, Montana State University, Bozeman MT, USA
| | - Edward M Rubin
- United States Department of Energy, Joint Genome Institute, Walnut Creek CA, USA
| | - James M Tiedje
- Center for Microbial Ecology, Michigan State University, East Lansing MI, USA
| | - Terry C Hazen
- Department of Civil and Environmental Engineering, University of Tennessee-Knoxville, Knoxville TN, USA ; Department of Earth and Planetary Sciences, University of Tennessee-Knoxville, Knoxville TN, USA ; Department of Microbiology, University of Tennessee-Knoxville, Knoxville TN, USA ; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge TN, USA
| | - Adam P Arkin
- Department of Bioengineering, Lawrence Berkeley National Laboratory, Berkeley CA, USA
| | - Jizhong Zhou
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman OK, USA ; Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley CA, USA ; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University Beijing, China
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6
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Guo YR, Wu Q, Odoh SO, Schreckenbach G, Pan QJ. Theoretical Study of Structural, Spectroscopic and Reaction Properties of trans-bis(imido) Uranium(VI) Complexes. Inorg Chem 2013; 52:9143-52. [DOI: 10.1021/ic401440w] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Yuan-Ru Guo
- Key Laboratory of Bio-based Material Science & Technology of Education Ministry, College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China
| | - Qian Wu
- Key Laboratory
of Functional Inorganic Material Chemistry of Education Ministry,
School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China
| | - Samuel O. Odoh
- Department
of Chemistry, University of Manitoba, Winnipeg,
MB, Canada R3T 2N2
- Environmental
Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352,
United States
| | - Georg Schreckenbach
- Department
of Chemistry, University of Manitoba, Winnipeg,
MB, Canada R3T 2N2
| | - Qing-Jiang Pan
- Key Laboratory
of Functional Inorganic Material Chemistry of Education Ministry,
School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China
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7
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Low-frequency complex conductivity of sandy and clayey materials. J Colloid Interface Sci 2013; 398:193-209. [DOI: 10.1016/j.jcis.2013.01.015] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Revised: 01/05/2013] [Accepted: 01/06/2013] [Indexed: 11/19/2022]
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Tang G, Wu WM, Watson DB, Parker JC, Schadt CW, Shi X, Brooks SC. U(VI) bioreduction with emulsified vegetable oil as the electron donor--microcosm tests and model development. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:3209-3217. [PMID: 23397992 DOI: 10.1021/es304641b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We conducted microcosm tests and biogeochemical modeling to study U(VI) reduction in contaminated sediments amended with emulsified vegetable oil (EVO). Indigenous microorganisms in the sediments degraded EVO and stimulated Fe(III), U(VI), and sulfate reduction, and methanogenesis. Acetate concentration peaked in 100-120 days in the EVO microcosms versus 10-20 days in the oleate microcosms, suggesting that triglyceride hydrolysis was a rate-limiting step in EVO degradation and subsequent reactions. Acetate persisted 50 days longer in oleate- and EVO- than in ethanol-amended microcosms, indicating that acetate-utilizing methanogenesis was slower in the oleate and EVO than ethanol microcosms. We developed a comprehensive biogeochemical model to couple EVO hydrolysis, production, and oxidation of long-chain fatty acids (LCFA), glycerol, acetate, and hydrogen, reduction of Fe(III), U(VI) and sulfate, and methanogenesis with growth and decay of multiple functional microbial groups. By estimating EVO, LCFA, and glycerol degradation rate coefficients, and introducing a 100 day lag time for acetoclastic methanogenesis for oleate and EVO microcosms, the model approximately matched observed sulfate, U(VI), and acetate concentrations. Our results confirmed that EVO could stimulate U(VI) bioreduction in sediments and the slow EVO hydrolysis and acetate-utilizing methanogens growth could contribute to longer term bioreduction than simple substrates (e.g., ethanol, acetate, etc.) in the subsurface.
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Affiliation(s)
- Guoping Tang
- Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, MS-6038, Oak Ridge, Tennessee 37831-6038, United States.
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9
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Tang G, Watson DB, Wu WM, Schadt CW, Parker JC, Brooks SC. U(VI) bioreduction with emulsified vegetable oil as the electron donor--model application to a field test. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:3218-3225. [PMID: 23438796 DOI: 10.1021/es304643h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We amended a shallow fast-flowing uranium (U) contaminated aquifer with emulsified vegetable oil (EVO) and subsequently monitored the biogeochemical responses for over a year. Using a biogeochemical model developed in a companion article (Tang et al., Environ. Sci. Technol.2013, doi: 10.1021/es304641b) based on microcosm tests, we simulated geochemical and microbial dynamics in the field test during and after the 2-h EVO injection. When the lab-determined parameters were applied in the field-scale simulation, the estimated rate coefficient for EVO hydrolysis in the field was about 1 order of magnitude greater than that in the microcosms. Model results suggested that precipitation of long-chain fatty acids, produced from EVO hydrolysis, with Ca in the aquifer created a secondary long-term electron donor source. The model predicted substantial accumulation of denitrifying and sulfate-reducing bacteria, and U(IV) precipitates. The accumulation was greatest near the injection wells and along the lateral boundaries of the treatment zone where electron donors mixed with electron acceptors in the groundwater. While electron acceptors such as sulfate were generally considered to compete with U(VI) for electrons, this work highlighted their role in providing electron acceptors for microorganisms to degrade complex substrates thereby enhancing U(VI) reduction and immobilization.
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Affiliation(s)
- Guoping Tang
- Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, MS-6038, Oak Ridge, Tennessee 37831-6038, United States.
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Pan QJ, Odoh SO, Schreckenbach G, Arnold PL, Love JB. Theoretical exploration of uranyl complexes of a designed polypyrrolic macrocycle: structure/property effects of hinge size on Pacman-shaped complexes. Dalton Trans 2012; 41:8878-85. [DOI: 10.1039/c2dt31055d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Qing-Jiang Pan
- Key Laboratory of Functional Inorganic Material Chemistry of Education Ministry, School of Chemistry and Materials Science, Heilongjiang University, Harbin, China 150080.
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11
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Pan QJ, Odoh SO, Asaduzzaman AM, Schreckenbach G. Adsorption of Uranyl Species onto the Rutile (110) Surface: A Periodic DFT Study. Chemistry 2011; 18:1458-66. [DOI: 10.1002/chem.201101320] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Indexed: 11/12/2022]
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