Biofilms of sulfate-reducing bacteria Desulfovibrio desulfuricans G20wereused to reduce dissolved U(VI)andsubsequently 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.
Uranium immobilization by sulfate-reducing biofilms grown on hematite, dolomite, and calcite / DI PALMA, Luca; E., Marsili; H., Beyenal; Merli, Carlo; A., Dohnalkova; J. E., Amonette; Z., Lewandowski. - In: ENVIRONMENTAL SCIENCE & TECHNOLOGY. - ISSN 0013-936X. - ELETTRONICO. - 41:24(2007), pp. 8349-8354. [10.1021/es071335k]
Uranium immobilization by sulfate-reducing biofilms grown on hematite, dolomite, and calcite
DI PALMA, Luca;MERLI, Carlo;
2007
Abstract
Biofilms of sulfate-reducing bacteria Desulfovibrio desulfuricans G20wereused to reduce dissolved U(VI)andsubsequently 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.