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Title: MESOSCALE BIOTRANSFORMATIONS OF URANIUM IN SEDIMENTS AND SOILS (Program Element: Biogeochemistry)

Abstract

In-situ bioreduction is being considered as a remediation strategy for uranium (U) contaminated sediments because of its potentially low cost, and because short-term studies support its feasibility. However, any in-situ approach for immobilizing U will require assurance of either permanent fixation, or of very low release rates into the biosphere. Our long-term laboratory studies have shown that reoxidation of bioreduced UO{sub 2} can occur even under reducing (methanogenic) conditions sustained by continuous infusion of lactate. The biogeochemical processes underlying this finding need to be understood. Our current research is designed to identify mechanisms responsible for anaerobic U oxidation, and identify effects of key factors controlling long-term stability of bioreduced U. These include: (1) effects of organic carbon (OC) concentrations and supply rates on stability of bioreduced U, (2) influences of pH on U(IV)/U(VI) redox equilibrium, (3) the roles of Fe- and Mn-oxides as potential U oxidants in sediments, and (4) the role of microorganisms in U reoxidation. Findings from some of these studies are summarized here.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA; University of California, Berkeley, CA; University of Chicago, Chicago, IL; University of Georgia, Athens, GA
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
894504
Report Number(s):
CONF-ERSP2006-29
TRN: US0700178
Resource Type:
Conference
Resource Relation:
Conference: Annual Environmental Remediation Sciences Program PI Meeting, April 3-5, 2006, Warrenton, VA
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; 54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; AVAILABILITY; BIOGEOCHEMISTRY; BIOSPHERE; CARBON; INFUSION; MICROORGANISMS; OXIDATION; OXIDIZERS; SEDIMENTS; SOILS; STABILITY; URANIUM

Citation Formats

Tetsu Tokunaga, Jiamin Wan, Brodic, Eoin, Yongman Kim, Hazen, Terry, Firestone, Mary, Herman, Don, Sutton, Steve, Newville, Matt, and Lanzirotti, Tony, Rao, Bill. MESOSCALE BIOTRANSFORMATIONS OF URANIUM IN SEDIMENTS AND SOILS (Program Element: Biogeochemistry). United States: N. p., 2006. Web.
Tetsu Tokunaga, Jiamin Wan, Brodic, Eoin, Yongman Kim, Hazen, Terry, Firestone, Mary, Herman, Don, Sutton, Steve, Newville, Matt, & Lanzirotti, Tony, Rao, Bill. MESOSCALE BIOTRANSFORMATIONS OF URANIUM IN SEDIMENTS AND SOILS (Program Element: Biogeochemistry). United States.
Tetsu Tokunaga, Jiamin Wan, Brodic, Eoin, Yongman Kim, Hazen, Terry, Firestone, Mary, Herman, Don, Sutton, Steve, Newville, Matt, and Lanzirotti, Tony, Rao, Bill. Wed . "MESOSCALE BIOTRANSFORMATIONS OF URANIUM IN SEDIMENTS AND SOILS (Program Element: Biogeochemistry)". United States. doi:. https://www.osti.gov/servlets/purl/894504.
@article{osti_894504,
title = {MESOSCALE BIOTRANSFORMATIONS OF URANIUM IN SEDIMENTS AND SOILS (Program Element: Biogeochemistry)},
author = {Tetsu Tokunaga and Jiamin Wan and Brodic, Eoin and Yongman Kim and Hazen, Terry and Firestone, Mary and Herman, Don and Sutton, Steve and Newville, Matt and Lanzirotti, Tony, Rao, Bill},
abstractNote = {In-situ bioreduction is being considered as a remediation strategy for uranium (U) contaminated sediments because of its potentially low cost, and because short-term studies support its feasibility. However, any in-situ approach for immobilizing U will require assurance of either permanent fixation, or of very low release rates into the biosphere. Our long-term laboratory studies have shown that reoxidation of bioreduced UO{sub 2} can occur even under reducing (methanogenic) conditions sustained by continuous infusion of lactate. The biogeochemical processes underlying this finding need to be understood. Our current research is designed to identify mechanisms responsible for anaerobic U oxidation, and identify effects of key factors controlling long-term stability of bioreduced U. These include: (1) effects of organic carbon (OC) concentrations and supply rates on stability of bioreduced U, (2) influences of pH on U(IV)/U(VI) redox equilibrium, (3) the roles of Fe- and Mn-oxides as potential U oxidants in sediments, and (4) the role of microorganisms in U reoxidation. Findings from some of these studies are summarized here.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 05 00:00:00 EDT 2006},
month = {Wed Apr 05 00:00:00 EDT 2006}
}

Conference:
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