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Environ Sci Technol. 2007 Dec 15;41(24):8349-54.

Uranium immobilization by sulfate-reducing biofilms grown on hematite, dolomite, and calcite.

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1
Center for Biofilm Engineering, Department of Civil Engineering, Montana State University, Bozeman, Montana 59717, USA.

Abstract

Biofilms of sulfate-reducing bacteria Desulfovibrio desulfuricans G20 were used to reduce dissolved U(VI) and subsequently immobilize U(IV) in the presence of uranium-complexing carbonates. The biofilms were grown in three identically operated fixed bed reactors, filled with three types of minerals: one noncarbonate-bearing mineral (hematite) and two carbonate-bearing minerals (calcite and dolomite). The source of carbonates in the reactors filled with calcite and dolomite were the minerals, while in the reactor filled with hematite it was a 10 mM carbonate buffer, pH 7.2, which we added to the growth medium. Our five-month study demonstrated that the sulfate-reducing biofilms grown in all reactors were able to immobilize/reduce uranium efficiently, despite the presence of uranium-complexing carbonates.

PMID:
18200862
[Indexed for MEDLINE]
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