Modeling U(VI) biomineralization in single- and dual-porosity porous media

Water Resources Research

Volumn 44, Issue 8, 2008, Pages

  Rotter, B E ^a   Barry, D A ^a,b   Gerhard, J I ^a,c   Small, J S ^d  

^a UNIVERSITY OF EDINBURGH   (United Kingdom)

^b EPFL   (Switzerland)

^c UNIVERSITY OF WESTERN ONTARIO   (Canada)

^d NATIONAL NUCLEAR LABORATORY   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

ACTINIDES; BIOGEOCHEMISTRY; BIOMINERALIZATION; DATA STORAGE EQUIPMENT; DYNAMIC POSITIONING; FLOW OF FLUIDS; GROUNDWATER; GROUNDWATER POLLUTION; GROUNDWATER RESOURCES; HYDROGEOLOGY; METAL RECOVERY; PERCOLATION (SOLID STATE); POLLUTION; POROUS MATERIALS; REMEDIATION; TRANSURANIUM ELEMENTS; URANIUM; URANIUM COMPOUNDS; VEGETATION;

BIOGEOCHEMICAL MODELING; BIOSTIMULATION; CONTAMINATED GROUNDWATER; DISSIMILATORY-METAL; DUAL-POROSITY; EXPERIMENTAL STUDIES; HETEROGENEOUS MEDIUM; IMMOBILIZATION EFFICIENCY; IN-SITU; MICROBIAL ACTIVITIES; MICROBIAL PROCESSES; POROUS MEDIUMS; REACTIVE TRANSPORT MODELLING; REMEDIATION TECHNOLOGIES; URANIUM EXTRACTION;

POROSITY;

AQUIFER POLLUTION; BACTERIUM; BIOGEOCHEMISTRY; BIOMINERALIZATION; EXPERIMENTAL STUDY; HETEROGENEOUS MEDIUM; HYDROLOGICAL MODELING; IMMOBILIZATION; MASS TRANSFER; MICROBIAL ACTIVITY; POROSITY; POROUS MEDIUM; URANIUM;

BACTERIA (MICROORGANISMS);

EID: 53849133436     PISSN: 00431397     EISSN: None     Source Type: Journal    
DOI: 10.1029/2007WR006301     Document Type: Article

References (138)

1. Abdelouas, A., L. Yongming, W. Lutze, and H. E. Nuttall (1998), Reduction of U(VI) to U(IV) by indigenous bacteria in contaminated ground water, J Contam. Hydrol., 35, 217-233, doi:10.1016/S0169-7722(98)00134-X.
2. Abdelouas, A., W. Lutze, W. Gong, E. H. Nuttall, B. A. Strietelmeier, and B. J. Travis (2000), Biological reduction of uranium in groundwater and subsurface soil, Sci. Total Environ., 250, 21-35, doi:10.1016/S0048- 9697(99)00549-5.
3. Ahmann, D., A. L. Roberts, H. F. Krumholz, and F. M. M. Morel (1994), Microbe grows by reducing arsenic, Nature, 371, 750.
4. Allison, J. D., D. S. Brown, and K. J. Novo-Gradec (1991), MINTEQA2/PRODEFA2, A Geochemical Assessment Model for Environmental Systems: Version 3.0 Users Manual, U. S. Environ. Prot. Agency, Athens, Ga.
5. Anderson, R. T., et al. (2003), Stimulating the in situ activity of Geobacter species to remove uranium from the groundwater of a uranium-contaminated aquifer, Appl. Environ. Microbiol., 69, 5884-5891, doi:10.1128/AEM.69.10.5884-5891.2003.
6. Applegate, D. H., and J. D. Bryers (1991), Effects of carbon and oxygen limitations and calcium concentrations on biofilm removal processes, Biotechnol Bioeng., 37, 17-25, doi:10.1002/bit.260370105.
7. Baedecker, M. J., and W. Back (1979), Hydrogeological processes and chemical reactions at a landfill, Ground Water, 17, 429-437.
8. Bajracharya, K., and D. A. Barry (1997), Nonequilibrium solute transport parameters and their physical significance: Numerical and experimental results, J. Contam. Hydrol., 24, 185-204, doi:10.1016/S0169-7722(96)00017-4.
9. Barnett, M. O., P. M. Jardine, S. C. Brooks, and H. M. Selim (2000), Adsorption and transport of uranium(VI) in subsurface media, Soil Sci. Soc. Am. J., 64, 908-917.
10. Barnett, M. O., P. M. Jardine, and S. C. Brooks (2002), U(VI) adsorption to heterogeneous subsurface media: Application of a surface complexation model, Environ. Sci. Technol., 36, 937-942, doi:10.1021/es010846i.
11. Barry, D. A., J. L. Starr, J.-Y. Parlange, and R. D. Braddock (1983), Numerical analysis of the snowplow effect, Soil Sci. Soc. Am. J., 47, 862-868.
12. Barry, D. A., H. Prommer, C. T. Miller, P. Engesgaard, A. Brun, and C. Zheng (2002), Modelling the fate of oxidisable organic contaminants in groundwater, Adv. Water Resour., 25, 945-983, doi:10.1016/S0309-1708(02) 00044-1.
13. Berner, R. A. (1980), Early Diagenesis: A Theoretical Approach, Princeton Univ. Press, Princeton, N. J.
14. Berner, R. A. (1981a), A new geochemical classification of sedimentary environments, J. Sediment. Petrol., 51, 359-365.
15. Berner, R. A. (1981b), Authigenic mineral formation resulting from organic matter decomposition in modern sediments, Fortschr. Mineral., 59, 117-135.
16. Boudreau, B. P., and B. R. Ruddick (1991), On a reactive continuum representation of organic matter diagenesis, Am. J. Sci., 291, 507-538.
17. Brooks, S. C., J. K. Fredrickson, S. L. Carroll, D. W. Kennedy, J. M. Zachara, A. E. Plymale, S. D. Kelly, K. M. Kemner, and S. Fendorf (2003), Inhibition of bacterial U(VI) reduction by calcium, Environ. Sci. Technol., 37, 1850-1858, doi.10.1021/es0210042.
18. Brun, A., and P. Engesgaard (2002), Modelling of transport and biogeochemical processes in pollution plumes: Literature review and model development, J. Hydrol., 256, 211-227, doi:10.1016/S0022-1694(01)00547-9.
19. Brun, A., P. Engesgaard, T. H. Christensen, and D. Rosbjerg (2002), Modelling of transport and biogeochemical processes in pollution plumes: Vejen landfill, Denmark, J. Hydrol., 256, 228-247, doi:10.1016/S0022-1694(01) 00549-2.
20. Caccavo, F., Jr., D. J. Lonergan, D. R. Lovley, M. Davis, J. F. Stolz, and M. J. McInerney (1994), Geobacter sulfurreducens sp. nov., a hydrogen and acetate-oxidizing dissimilatory metal reducing microorganism, Appl. Environ. Microbiol., 60, 3752-3759.
21. Caufield, D. E., B. Thamdrup, and J. W. Hansen (1993), The anaerobic degradation of organic matter in Danish coastal sediments: Iron reduction, manganese reduction and sulfate reduction, Geochim. Cosmochim. Acta, 57, 3867-3883, doi:10.1016/0016-7037(93)90340-3.
22. Chang, Y.-J. (2005), In situ biostimulation of uranium reducing microorganisms at the Old Rifle UMTRA site, Ph.D. thesis, Univ. of Tenn., Knoxville.
23. Chapelle, F. H., and D. R. Lovley (1992), Competitive exclusion of sulfate reduction by Fe(III)-reducing bacteria: A mechanism for producing discrete zones of high-iron ground water, Ground Water, 30, 29-36, doi:10.1111/j.1745-6584.1992.tb00808.x.
24. Detmers, J., U. Schulte, H. Strauss, and J. Kuever (2001), Sulfate reduction at a lignite seam: Microbial abundance and activity, Microbiol. Ecol., 42, 238-247, doi:10.1007/s00248-001-1014-8.
25. DiChristina, T. J. (1992), Effects of nitrate and nitrite on dissimilatory Fe(III) reduction by Shewanella putrefaciens, J. Bacteriol., 174, 1891-1896.
26. Dong, W., W. P. Ball, C. Liu, Z. Wang, A. T. Shore, J. Bai, and J. M. Zachara (2005), Influence of calcite and dissolved calcium on uranium(VI) sorption to a Hanford subsurface sediment, Environ. Sci. Technol., 39, 7949-7955, doi:10.1021/es0505088.
27. Dzombak, D. A., and F. M. M. Morel (1990), Surface Complexation Modelling: Hydrous Ferric Oxide, John Wiley, New York.
28. Federal Register (1995), Groundwater standards for remedial actions at inactive uranium processing sites, CFR 40, part 192, Table 1, U.S. Environ. Prot. Agency, Washington, D.C.
29. Feehley, C. E., C. Zheng, and F. J. Molz (2000), A dual-domain mass transfer approach for modeling solute transport in heterogeneous aquifers: Application to the macrodispersion experiment (MADE) site, Water Resour. Res., 36, 2501-2515.
30. Fetter, C. W. (1994), Applied Hydrogeology, 3rd ed., Prentice Hall, Upper Saddle River, N. J.
31. Finneran, K. T., R. T. Anderson, K. P. Nevin, and D. R. Lovley (2002a), Potential for bioremediation of uranium-contaminated aquifers with microbial U(VI) reduction, Soil Sediment. Contam., 11, 339-357, doi:10.1080/20025891106781.
32. Finneran, K. T., M. E. Housewright, and D. R. Lovley (2002b), Multiple influences of nitrate on uranium solubility during bioremediation of uranium-contaminated subsurface sediments, Environ. Microbiol., 4, 510-516, doi:10.1046/j.1462-2920.2002.00317.x.
33. Francis, A. J., C. J. Dodge, F. Lu, G. P. Halada, and C. R. Clayton (1994), XPS and XANES studies of uranium reduction by Clostridium sp, Environ. Sci. Technol., 28, 636-639, doi:10.1021/es00053a016.
34. Fredrickson, J. K., et al. (1997), Pore-size constraints on the activity and survival of subsurface bacteria in a late Cretaceous shale-sandstone sequence, northwestern New Mexico, Geomicrobiol J., 14, 183-202.
35. Fredrickson, J. K., J. M. Zachara, D. W. Kennedy, M. C. Duff, and Y. A. Gorby (2000), Reduction of U(VI) in goethite (alpha-FeOOH) suspensions by a dissimilatory metal-reducing bacterium, Geochim. Cosmochim. Acta, 64, 3085-3098.
36. Fredrickson, J. K., J. M. Zachara, D. W. Kennedy, C. Liu, M. C. Duff, D. B. Hunter, and A. Dohnalkova (2002), Influence of Mn oxides on the reduction of uranium(VI) by the metal-reducing bacterium Shewanella putrefaciens, Geochim. Cosmochim. Acta, 66, 3247-3262, doi:10.1016/S0016-7037(02)00928-6.
37. Ganesh, R., K. G. Robinson, L. Chu, D. Kucsmas, and G. D. Reed (1999), Reductive precipitation of uranium by Desulfovibrio desulfuricans: Evaluation of cocontaminant effects and selective removal, Water Res., 33, 3447-3458, doi:10.1016/S0043-1354(99)00024-X.
38. Gorby, Y. A., and D. R. Lovley (1992), Enzymatic uranium precipitation, Environ. Sci. Technol., 26, 205-207, doi:10.1021/es00025a026.
39. Gorby, Y. A., F. Caccavo Jr., and H. Bolton Jr. (1998), Microbial reduction of cobalt(III)EDTA in the presence and absence of manganese(IV) oxide, Environ. Sci. Technol., 32, 244-250, doi:10.1021/es970516r.
40. Griffioen, J. W., D. A. Barry, and J.-Y. Parlange (1998), Interpretation of two-region model parameters, Water Resour. Res., 34, 373-384.
41. Grisak, G. E., and J. F. Pickens (1980), Solute transfer through fractured media: 1. The effect of matrix diffusion, Water Resour. Res., 16, 719-730.
42. Grisak, G. E., J. F. Pickens, and J. A. Cherry (1980), Solute transport through fractured media: 2. Column study of fractured till, Water Resour. Res., 16, 731-739.
43. Gu, B., and J. Chen (2003), Enhanced microbial reduction of Cr (VI) and U(VI) by different natural organic matter fractions, Geochim. Cosmochim. Acta, 67, 3575-3582, doi:10.1016/S0016-7037(03)00162-5.
44. Gwo, J.-P., P. M. Jardine, and W. Sanford (2005), Effect of advective mass transfer on field scale fluid and solute movement: Field and modeling studies at a waste disposal site in fractured rock at Oak Ridge National Laboratory, Tennessee, USA, Hydrogeol. J., 13, 565-583, doi:10.1007/s10040-004-0367-8.
45. Harvey, C., and S. M. Gorelick (2000), Rate-limited mass transfer or macrodispersion: Which dominates plume evolution at the Macrodispersion Experiment (MADE) site?, Water Resour. Res., 36, 637-650.
46. Haws, N. W., B. S. Das, and P. S. C. Rao (2004), Dual-domain solute transfer and transport processes: Evaluation in batch and transport experiments, J. Contam. Hydrol., 75, 257-280, doi.10.1016/j.jconhyd.2004.07.001.
47. Haws, N. W., P. S. C. Rao, J. Simunek, and I. C. Poyer (2005), Single-porosity and dual-porosity modeling of water flow and solute transport in subsurface-drained fields using effective field-scale parameters, J. Hydrol., 313, 257-273, doi:10.1016/j.jhydrol.2005.03.035.
48. Haws, N. W., W. P. Ball, and E. J. Bower (2007), Effects of initial solute distribution on contaminant availability, desorption modeling, and subsurface remediation, J. Environ. Qual., 36, 1392-1402.
49. Hazen, T. C., and H. H. Tabak (2005), Developments in bioremediation of soils and sediments polluted with metals and radionuclides: 2. Field research on bioremediation of metals and radionuclides, Rev. Environ. Sci. Biotechnol., 4, 157-183, doi:10.1007/s11157-005-2170-y.
50. Holmes, D. E., K. T. Finneran, R. A. O'Neil, and D. R. Lovley (2002), Enrichment of members of the family Geobacteraceae associated with stimulation of dissimilatory metal reduction in uranium-contaminated aquifer sediments, Appl. Environ. Microbiol., 68, 2300-2306, doi:10.1128/AEM.68.5.2300-2306. 2002.
51. 3, J. Colloid Interface Sci., 22, 231-1941.
52. Hunter, K. S., Y. Wang, and P. Van Cappellen (1998), Kinetic modeling of microbially-driven redox chemistry of subsurface environments: Coupling transport, microbial metabolism and geochemistry, J. Hydrol., 209, 53-80, doi:10.1016/S0022-1694(98)00157-7.
53. Istok, J. D., J. M. Senko, L. R. Krumholz, D. Watson, M. A. Bogle, A. Peacock, Y. J. Chang, and D. C. White (2004), In situ bioreduction of technetium and uranium in a nitrate-contaminated aquifer, Environ. Sci. Technol., 38, 468-475, doi:10.1021/es034639p.
54. Jaffé, P. R., and H. A. Rabitz (1988), NABIR Systems Integration Workshop, Summary of Proceedings, Dep. of Energy, Off. of Biol. and Environ. Res., Washington, D. C., 18 Dec.
55. Jakobsen, R., and D. Postma (1999), Redox zoning, rates of sulfate reduction and interactions with Fe-reduction and methanogenesis in a shallow sandy aquifer, Rome, Denmark, Geochim. Cosmochim. Acta, 63, 137-151, doi:10.1016/S0016-7037(98)00272-5.
56. Jeon, B.-H., S. D. Kelly, K. M. Kemner, M. O. Barnett, W. D. Burgos, B. A. Dempsey, and E. E. Roden (2004), Microbial reduction of U(VI) at the solid-water interface, Environ. Sci. Technol., 38, 5649-5655, doi:10.1021/es0496120.
57. Jørgensen, P. R., T. Helstrup, J. Urup, and D. Seifert (2004), Modeling of non-reactive solute transport in fractured clayey till during variable flow rate and time, J. Contam. Hydrol., 68, 193-216, doi:10.1016/S0169-7722(03)00146-3.
58. Julian, H. E., J. M. Boggs, C. Zheng, and C. E. Feehley (2001), Numerical simulation of a natural gradient tracer experiment for the natural attenuation study: Flow and physical transport, Ground Water, 39, 534-545, doi:10.1111/j.1745-6584.2001.tb02342.x.
59. Keating, E. H., and J. M. Bahr (1998), Reactive transport modeling of redox geochemistry: Approaches to chemical disequilibrium and reaction rate estimation at a site in northern Wisconsin, Water Resour. Res., 34, 3573-3584.
60. Kieft, T. L., J. K. Fredrickson, J. P. McKinley, B. N. Bjornstad, S. A. Rawson, T. J. Phelps, F. J. Brockman, and S. M. Pfiffner (1995), Microbiological comparisons within and across contiguous lacustrine, paleosol, and fluvial subsurface sediments, Appl. Environ. Microbiol., 61, 749-757.
61. Kim, S.-B., and M. Y. Corapcioglu (2002), Contaminant transport in dual-porosity media with dissolved organic matter and bacteria present as mobile colloids, J. Contam. Hydrol., 59, 267-289, doi:10.1016/S0169-7722(02) 00043-8.
62. Krumholz, L. R., J. P. McKinley, G. A. Ulrich, and J. S. Sulfita (1997), Confined subsurface microbial communities in Cretaceous rock, Nature, 386, 64-66, doi:10.1038/386064a0.
63. Kuivila, K. M., J. W. Murray, A. H. Devol, and P. C. Novelli (1989), Methane production, sulfate reduction and competition for substrates in the sediments of Lake Washington, Geochim. Cosmochim. Acta, 53, 409-416, doi:10.1016/0016-7037(89)90392-X.
64. Landa, E. R., and J. R. Gray (1995), US Geological Survey: Research on the environmental fate of uranium mining and milling wastes, Environ. Geol., 26, 19-31, doi:10.1007/BF00776028.
65. Langmuir, D. (1978), Uranium solution-mineral equilibria at low temperatures with applications to sedimentary ore deposits, Geochim. Cosmochim. Acta, 42, 547-569, doi:10.1016/0016-7037(78)90001-7.
66. Langmuir, D. (1997), Aqueous Environmental Geochemistry, Prentice-Hall, Upper Saddle River, N. J.
67. Lehman, R. M., S. P. O'Connell, A. Banta, J. K. Fredrickson, A.-L. Reysenbach, T. L. Kieft, and F. S. Colwell (2004), Microbiological comparison of core and groundwater samples collected from a fractured basalt aquifer with that of dialysis chambers incubated in situ, Geomicrobiol. J., 21, 169-182, doi:10.1080/01490450490275848.
68. Li, L., D. A. Barry, P. J. Culligan-Hensley, and K. Bajracharya (1994), Mass transfer in soils with local stratification of hydraulic conductivity, Water Resour. Res., 30, 2891-2900.
69. Liu, C., S. Kota, J. M. Zachara, J. K. Fredrickson, and C. Brinkman (2001), Kinetic analysis of the bacterial reduction of goethite, Environ. Sci. Technol., 35, 2482-2490.
70. Liu, C., Y. A. Gorby, J. M. Zachara, J. K. Fredrickson, and C. F. Brown (2002), Reduction kinetics of Fe(III), Co (III), U(VI), Cr (VI), and Tc (VII) in cultures of dissimilatory metal-reducing bacteria, Biotechnol Bioeng., 80, 637-649, doi:10.1002/bit.10430.
71. Liu, C., J. M. Zachara, L. Zhong, R. Kakkadapu, J. E. Szecsody, and D. W. Kennedy (2005), Influence of sediment bioreduction and reoxidation on uranium sorption, Environ. Sci. Technol., 39, 4125-4133, doi:10.1021/es048501y.
72. Lloyd, J. R., and L. E. Macaskie (1996), A novel phosphor imager based technique for monitoring the microbial reduction of technetium, Appl. Environ. Microbiol., 62, 578-582.
73. Lloyd, J. R., V. A. Sole, C. V. Van Praagh, and D. R. Lovley (2000), Direct and Fe (II)-mediated reduction of technetium by Fe(III)-reducing bacteria, Appl. Environ. Microbiol., 66, 3743-3749.
74. Lovley, D. R. (1993), Dissimilatory metal reduction, Annu. Rev. Microbiol., 47, 263-290, doi:10.1146/annurev.mi.47.100193.001403.
75. Lovley, D. R., and F. H. Chapelle (1995), Deep subsurface microbial processes, Rev. Geophys., 33, 365-381.
76. Lovley, D. R., and S. Goodwin (1988), Hydrogen concentrations as an indicator of predominant terminal electron accepting reactions in aquatic sediments, Geochim. Cosmochim. Acta, 52, 2993-3003, doi:10.1016/0016- 7037(88)90163-9.
77. Lovley, D. R., and E. J. P. Phillips (1988), Novel mode of microbial energy metabolism: Organic carbon oxidation coupled to dissimilatory reduction of iron or manganese, Appl. Environ. Microbiol., 54, 1472-1480.
78. Lovley, D. R., and E. J. P. Phillips (1992a), Bioremediation of uranium contamination with enzymatic uranium reduction, Environ. Sci. Technol., 26, 2228-2234, doi:10.1021/es00035a023.
79. Lovley, D. R., and E. J. P. Phillips (1992b), Reduction of uranium by Desulfovibrio desulfuricans, Appl. Environ. Microbiol., 58, 850-856.
80. Lovley, D. R., E. J. P. Phillips, Y. A. Gorby, and E. R. Landa (1991), Microbial reduction of uranium, Nature, 350, 413-416, doi:10.1038/350413a0.
81. Lovley, D. R., E. E. Roden, E. J. P. Phillips, and J. C. Woodward (1993), Enzymatic iron and uranium reduction by sulfate-reducing bacteria, Mar. Geol., 113, 41-53, doi:10.1016/0025-3227(93)90148-O.
82. Luo, J., O. A. Cirpka, W. Wu, M. N. Fienen, P. M. Jardine, T. L. Mehlhorn, D. B. Watson, C. S. Criddle, and P. K. Kitanidis (2005), Mass-transfer limitations for nitrate removal in a uranium-contaminated aquifer, Environ. Sci. Technol., 39, 8453-8459, doi:10.1021/es050195g.
83. Luo, J., F.-A. Weber, O. A. Cirpka, W.-M. Wu, J. L. Nyman, J. Carley, P. M. Jardine, C. S. Criddle, and P. K. Kitanidis (2007), Modeling insitu uranium(VI) bioreduction by sulfate-reducing bacteria, J. Contam. Hydrol., 92, 129-148, doi:10.1016/j.jconhyd.2007.01.004.
84. Macaskie, L. E., P. Yong, T. C. Doyle, M. G. Roig, M. Diaz, and T. Manzano (1997), Bioremediation of uranium-bearing wastewater: Biochemical and chemical factors influencing bioprocess application, Biotechnol. Bioeng., 53, 100-109, doi:10.1002/(SICI)1097-0290(19970105)53:1〈100::AID- BIT13〉3.0.CO;2-S.
85. Madsen, E. L., and W. C. Ghiorse (1993), Groundwater microbiology: Subsurface ecosystem processes, in Aquatic Microbiology: An Ecological Approach, edited by T. E. Ford, pp. 167-213, Blackwell, Malden, Mass.
86. McMahon, P. B., and F. H. Chapelle (1991), Microbial production of organic acids in aquitard sediments and its role in aquifer geochemistry, Nature, 349, 233-235, doi:10.1038/349233a0.
87. McNab, W. W., and T. N. Narasimhan (1994), Modeling reactive transport of organic compounds in groundwater using a partial redox disequilibrium approach, Water Resour. Res., 30, 2619-2636.
88. McNab, W. W., Jr., and T. N. Narasimhan (1995), Reactive transport of petroleum hydrocarbon constituents in a shallow aquifer: Modeling geochemical interactions between organic and inorganic species, Water Resour. Res., 31, 2027-2033.
89. Middelburg, J. J. (1989), A simple rate model for organic matter decomposition in marine sediments, Geochim. Cosmochim. Acta, 53, 1577-1581, doi:10.1016/0016-7037(89)90239-1.
90. Murphy, E. M., J. A. Schramke, J. K. Fredrickson, H. W. Bledsoe, A. J. Francis, D. S. Sklarew, and J. C. Linehan (1992), The influence of microbial activity and sedimentary organic carbon on the isotope geochemistry of the Middendorf aquifer, Water Resour. Res., 28, 723-740.
91. Musslewhite, C. L., M. J. McInerney, H. Dong, T. C. Onstott, M. Green-Blum, D. Swift, S. MacNaughton, D. C. White, C. Murray, and J.-Y. Chien (2003), The factors controlling microbial distribution and activity in the shallow subsurface, Geomicrobiol. J., 20, 245-261, doi:10.1080/ 01490450303877.
92. Nicholson, R. V., J. A. Cherry, and E. J. Reardon (1983), Migration of contaminants in groundwater at a landfill: A case study, 6, Hydrogeochemistry (Borden landfill), J. Hydrol., 63(1-2), 131-176.
93. North, N. N., S. L. Dollhopff, L. Petrie, J. D. Istok, D. L. Balkwill, and J. E. Kostka (2004), Change in bacterial community structure during in situ biostimulation of subsurface sediment cocontaminated with uranium and nitrate, Appl. Environ. Microbiol., 70, 4911-4920, doi:10.1128/AEM.70.8.4911-4920. 2004.
94. Nyman, J. L., T. L. Marsh, M. A. Ginder-Vogel, M. Gentile, S. Fendorf, and C. Criddle (2006), Heterogeneous response to biostimulation for U(VI) reduction in replicated sediment microcosms, Biodegradation, 17, 303-316, doi:10.1007/s10532-005-9000-3.
95. Oremland, R., J. S. Blum, C. Culbertson, P. Visscher, L. Miller, P. Dowdle, and F. Strohmaier (1994), Isolation, growth and metabolism of an obligately anaerobic selenate-respiring bacterium, strain SES-3, Appl. Environ. Microbiol., 60, 3011-3019.
96. Ortiz-Bernad, I., R. T. Anderson, H. A. Vrionis, and D. R. Lovley (2004), Resistance of solid-phase U(VI) to microbial reduction during in situ bioremediation of uranium-contaminated groundwater, Appl. Environ. Microbiol., 70, 7558-7560, doi:10.1128/AEM.70.12.7558-7560.2004.
97. Parkes, R. J., B. A. Cragg, J. C. Fry, R. A. Herbert, and J. W. T. Wimpenny (1990), Bacterial biomass and activity in deep sediment layers from the Peru margin, Philos. Trans. R. Soc. London, Ser. A, 331, 139-153, doi:10.1098/rsta.1990.0061.
98. Parkhurst, D. L., and C. A. J. Appelo (1999), User's guide to PHREEQC (version 2): A computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations, U.S. Geol. Surv. Water Resour. Invest., 99-4259.
99. Petrie, L., N. N. North, S. L. Dollhopf, D. L. Balkwill, and J. E. Kostka (2003), Enumeration and characterization of iron (III)-reducing microbial communities from acidic subsurface sediments contaminated with uranium(VI), Appl. Environ. Microbiol., 69, 7467-7479, doi:10.1128/AEM.69.12.7467- 7479.2003.
100. Postma, D., and R. Jakobsen (1996), Redox zonation: Equilibrium constraints on the Fe(III)/SO-reduction interface, Geochim. Cosmochim. Acta, 60, 3169-3175, doi:10.1016/0016-7037(96)00156-1.
101. Prommer, H., D. A. Barry, and G. B. Davis (1999a), A one-dimensional reactive multi-component transport model for biodegradation of petroleum hydrocarbons in groundwater, Environ. Modell. Software, 14, 213- 223, doi:10.1016/S1364-8152(98)00072-3.
102. Prommer, H., G. B. Davis, and D. A. Barry (1999b), Geochemical changes during biodegradation of petroleum hydrocarbons: Field investigations and biogeochemical modeling, Org. Geochem., 30, 423-435, doi:10.1016/S0146- 6380(99)00027-3.
103. Quintan, G. E., R. J. Buchanan, D. E. Ellis, and S. H. Shoemaker (1997), A method to compare groundwater cleanup technologies, Remediation, 7, 7-16.
104. Ranville, J. F., M. J. Hendry, T. N. Reszat, Q. Xie, and B. D. Honeyman (2006), Quantifying uranium complexation by groundwater dissolved organic carbon using asymmetrical flow field-flow fractionation, J. Contam. Hydrol., 91, 233-246, doi:10.1016/j.jconhyd.2006.11.002.
105. Riley, R. G., J. M. Zachara, and F. J. Wobber (1992), Chemical contaminants on DOE land and selections of contaminant mixtures for subsurface science research, DOE/ER-0547T, U.S. Dep. of Energy, Washington, D. C.
106. Robertson, W. D., B. M. Russell, and J. A. Cherry (1996), Attenuation of nitrate in aquitard sediments of southern Ontario, J. Hydrol., 180, 267-281, doi:10.1016/0022-1694(95)02885-4.
107. Roden, E. E., and T. D. Scheibe (2005), Conceptual and numerical model of uranium(VI) reductive immobilization in fractured subsurface sediments, Chemosphere, 59, 617-628, doi:10.1016/j.chemosphere.2004.11.007.
108. Ryan, M. C., K. T. B. MacQuarrie, J. Harman, and J. McLelland (2000), Field and modeling evidence for a "stagnant flow" zone in the upper meter of sandy phreatic aquifers, J. Hydrol., 233, 223-240, doi:10.1016/S0022-1694(00)00236-5.
109. Sani, R. K., B. M. Peyton, J. E. Amonette, and G. G. Geesey (2004), Reduction of uranium(VI) under sulfate-reducing conditions in the presence of Fe(III)-(hydr)oxides, Geochim. Cosmochim. Acta, 68, 2639-2648, doi:10.1016/j.gca.2004.01.005.
110. Schroth, M. H., J. D. Istok, G. T. Conner, M. R. Hyman, R. Haggerty, and K. T. O'Reilly (1998), Spatial variability in in situ aerobic respiration and denitrification rates in a petroleum-contaminated aquifer, Ground Water, 36, 924-937, doi:10.1111/j.1745-6584.1998.tb02099.x.
111. Senko, J. M., J. D. Istok, J. M. Suflita, and L. R. Krumholz (2002), In-situ evidence for uranium immobilization and remobilization, Environ. Sci. Technol., 36, 1491-1496, doi:10.1021/es011240x.
112. Sidle, R. C., B. Nilsson, M. Hansen, and J. Fredericia (1998), Spatially varying hydraulic and solute transport characteristics of a fractured till determined by field tracer tests, Funen, Denmark, Water Resour. Res., 34, 2515-2527.
113. Simunek, J., N. J. Jarvis, M. T. van Genuchten, and A. Gardenas (2003), Review and comparison of models for describing nonequilibrium and preferential flow and transport in the vadose zone, J. Hydrol., 272, 14-35, doi:10.1016/S0022-1694(02)00252-4.
114. Smith, A. C., D. Balkwill, A. S. Madden, and T. J. Phelps (2006), Microbial community responses to nitrate-indifferent uranium bioreduction, Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract B53C-0356.
115. Snoeyenbos-West, O., K. P. Nevin, R. T. Anderson, and D. R. Lovley (2000), Enrichment of Geobacter species in response to stimulation of Fe(III) reduction in sandy aquifer sediments, Microbiol Ecol., 39, 153-167, doi:10.1007/s002480000018.
116. Spear, J. R., L. A. Figueroa, and B. D. Honeyman (2000), Modeling reduction of uranium U(VI) under variable sulfate concentrations by sulfate-reducing bacteria, Appl. Environ. Microbiol., 66, 3711-3721, doi:10.1128/AEM.66.9.3711-3721.2000.
117. Starr, J. L., and J.-Y. Parlange (1979), Dispersion in soil columns: The snow plow effect, Soil Sci. Soc. Am. J., 43, 448-450.
118. Stumm, W., and J. J. Morgan (1996), Aquatic Chemistry: Chemical Equilibria and Rates in Natural Water, 3rd ed., John Wiley, New York.
119. Stumm, W., C. P. Huang, and S. R. Jenkins (1970), Specific chemical interactions affecting the stability of dispersed systems, Croat. Chem. Acta, 42, 223-244.
120. Suzuki, Y., and T. Suko (2006), Geomicrobiological factors that control uranium mobility in the environment: Update on recent advances in the bioremediation of uranium-contaminated sites, J. Mineral. Petrol. Sci., 101, 299-307, doi:10.2465/jmps.060322.
121. Suzuki, Y., S. D. Kelly, K. M. Kemner, and J. F. Banfield (2003), Microbial populations stimulated for hexavalent uranium reduction in uranium mine sediment, Appl. Environ. Microbiol., 69, 1337-1346, doi:10.1128/AEM.69.3.1337-1346.2003.
122. Suzuki, Y., S. D. Kelly, K. M. Kemner, and J. F. Banfield (2005), Direct microbial reduction and subsequent preservation of uranium in natural near-surface sediment, Appl. Environ. Microbiol., 71, 1790-1797. doi:10.1128/AEM.71.4.1790-1797.2005.
123. Tang, D. H., E. O. Frind, and E. A. Sudicky (1981), Contaminant transport in fractured porous media: Analytical solution for a single fracture, Water Resour. Res., 17, 555-564, doi:10.1029/WR017i003p00555.
124. Tebo, B. M., and A. Y. Obraztsova (1998), Sulfate-reducing bacterium grows with Cr(VI), U(VI), Mn(IV), and Fe(III) as electron acceptors, FEMS Microbiol. Lett., 162, 193-198, doi:10.1111/j.1574-6968.1998.tb12998.x.
125. Thullner, M., P. Van Cappellen, and P. Regnier (2005), Modelling the impact of microbial activity on redox dynamics in porous media, Geochim. Cosmochim. Acta, 69, 5005-5019.
126. Truex, M. J., B. M. Peyton, N. B. Valentine, and Y. A. Gorby (1997), Kinetics of U(VI) reduction by a dissimilatory Fe(III)-reducing bacterium under non-growth conditions, Biotechnol. Bioeng., 55, 490-496, doi:10.1002/(SICI)1097-0290(19970805)55:3〈490::AID-BIT4〉3.0.CO;2-7.
127. Ulrich, G., A. D. Martino, K. Burger, J. Routh, E. L. Grossman, J. W. Ammerman, and J. M. Suflita (1998), Sulfur cycling in the terrestrial subsurface: Commensal interactions, spatial scales, and microbial heterogeneity, Microbiol. Ecol., 36, 141-151, doi:10.1007/s002489900101.
128. van Breukelen, B. M., C. A. J. Appelo, and T. N. Olsthoom (1998), Hydrogeochemical transport modeling of 24 years of Rhine water infiltration in the dunes of the Amsterdam Water Supply, J. Hydrol., 209, 281-296, doi:10.1016/S0022-1694(98)00105-X.
129. van Genuchten, M. T., and P. J. Wierenga (1976), Mass transfer studies in sorbing porous media, I, Analytical solutions, Soil Sci. Soc. Am. J., 40, 473-481.
130. VanGulck, J. F., and R. K. Rowe (2004), Evolution of clog formation with time in columns permeated with synthetic landfill leachate, J. Contam. Hydrol., 75, 115-139, doi:10.1016/j.jconhyd.2004.06.001.
131. Vrionis, H. A., R. T. Anderson, I. Ortiz-Bernard, K. R. O'Neill, C. T. Resch, A. D. Peacock, R. Dayvault, D. C. White, P. E. Long, and D. R. Lovley (2005), Microbiological and geochemical heterogeneity in an in situ uranium bioremediation field site, Appl. Environ. Microbiol., 71, 6308-6318, doi:10.1128/AEM.71.10.6308-6318.2005.
132. Waite, T. D., J. A. Davis, T. E. Payne, G. A. Waychunas, and N. Xu (1994), Uranium (VI) adsorption to ferrihydrite: Application of a surface complexation model, Geochim. Cosmochim. Acta, 58, 5465-5478, doi:10.1016/0016-7037(94)90243-7.
133. Wan, J., T. K. Tokunaga, E. Brodie, Z. Wang, Z. Zheng, D. Herman, T. C. Hazen, M. K. Firestone, and S. R. Sutton (2005), Reoxidation of bioreduced uranium under reducing conditions, Environ. Sci. Technol., 39, 6162-6169, doi:10.1021/es048236g.
134. Wang, S., P. R. Jaffe, G. Li, S. W. Wang, and H. A. Rabitz (2003), Simulating bioremediation of uranium-contaminated aquifers: Uncertainty assessment of model parameters, J. Contam. Hydrol., 64, 283-307, doi:10.1016/S0169-7722(02)00230-9.
135. Wang, Y., and H. W. Papenguth (2001), Kinetic modeling of microbially-driven redox chemistry of radionuclides in subsurface environments: Coupling transport, microbial metabolism and geochemistry, J. Contam. Hydrol., 47, 297-309, doi:10.1016/S0169-7722(00)00158-3.
136. Westrich, J. T., and R. A. Berner (1984), The role of sedimentary organic matter in bacterial sulfate reduction: The G model tested, Limnol. Oceanogr., 29, 236-249.
137. Wielinga, B., B. Bostick, C. M. Hansel, R. F. Rosenzweig, and S. Fendorf (2000), Inhibition of bacterially promoted uranium reduction: Ferric (hydr)oxides as competitive electron acceptors, Environ. Sdi. Technol., 34, 2190-2195, doi:10.1021/es9911891.
138. Wilson, G. V., P. M. Jardine, J. D. Odell, and M. Collineau (1993), Field-scale transport from a buried line source in variably saturated soil, J. Hydrol., 145, 83-109.