In Situ Immobilization of Uranium in Structured Porous Media via Biomineralization at the Fraction/Matrix Interface

Roden, Eric E.

University of Alabama, Birmingham, AL

关键词: Abundance;    Slurries;    Sediments;    Uranium;    Chemical Composition;   

DOI  :  10.2172/893684
RP-ID  :  NABIR-1020166-2004
RP-ID  :  None
RP-ID  :  893684

美国|英语

来源: UNT Digital Library

【 摘 要 】

The major objectives of the University of Alabama component of this project are to (1) characterize the chemical composition (mainly iron and uranium abundance and redox speciation) of FRC Area 2 sediments; (2) assess the potential for stimulation of microbial Fe(III) and U(VI) reduction in slurries of Area 2 sediments; and (3) analyze the response of microbial community structure to biostimulation, specifically with regard to the abundance and diversity of dissimilatory metal-reducing bacterial (DMRB) populations. As an inclusive working hypothesis, we anticipate that it will be possible to stimulate microbial metal reduction in Area 2 sediment depth strata containing substantial quantities of Fe(III) oxides and U(VI), and that a major enrichment in known DMRB (e.g. Geobacteraceae and related organisms) will take place in response to biostimulation. Information on rates of microbial metabolism, patterns of Fe/U biotransformation, and microbial community response obtained in the slurry experiments will be used to constrain preliminary numerical simulations of the field-scale biostimulation experiment, and to provide molecular (e.g. 16S rRNA/rDNA) targets for assessing the response of DMRB activity to in situ biostimulation. Our progress to date on the above objectives is summarized.