Uranium removal by sulfate reducing biofilms in the presence of carbonates

Enrico MARSILI, H BEYENAL, L DI PALMA, Luca DI PALMA, Carlo Merli, Zbigniew Lewandowski

Research output: Journal PublicationArticlepeer-review

36 Citations (Scopus)

Abstract

Hexavalent uranium [U(VI)] was immobilized in biofilms composed of the sulfate reducing bacteria (SRB), Desulfovibrio desulfuricans G20. The biofilms were grown in two flat-plate, continuous-flow reactors using lactate as the electron donor and sulfate as the electron acceptor. The growth medium contained uranium U(VI) and the pH was maintained constant using bicarbonate buffer. The reactors were operated for 5 months, and during that time biofilm activity and uranium removal were evaluated. The efficiency of uranium removal strongly depended on the concentration of uranium in the influent, and was estimated to be 30.4% in the reactor supplied with 3 mg/L of U(VI) and 73.9% in the reactor supplied with 30 mg/L of U(VI). TEM and SAED analysis showed that uranium in both reactors accumulated mostly on microbial cell membranes and in the periplasmic space. The deposits had amorphous or poor nanocrystalline structures.
Original languageEnglish
Pages (from-to)49-55
JournalWater Science and Technology
Volume52
Issue number7
DOIs
Publication statusPublished - 2005
Externally publishedYes

Keywords

  • Biofilm
  • D. desulfuricans
  • uranium immobilization
  • uranium reduction

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