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

Enrico MARSILI, Haluk Beyenal, Luca Di Palma, Carlo Merli, Alice Dohnalkova, James, E. Amonette

Research output: Journal PublicationArticlepeer-review

35 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)8349-8354
JournalEnvironmental Science & Technology
Volume41
Issue number24
DOIs
Publication statusPublished - 8 Nov 2007
Externally publishedYes

Keywords

  • Biofilms
  • Calcite
  • Hematite
  • Inorganic carbon compounds
  • Uranium

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