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首页> 外文期刊>Environmental Science & Technology >Uranium Immobilization by Sulfate-Reducing Biofilms Grown on Hematite, Dolomite, And Calcite
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Uranium Immobilization by Sulfate-Reducing Biofilms Grown on Hematite, Dolomite, And Calcite

机译：通过在赤铁矿，白云石和方解石上生长的硫酸盐还原生物膜固定铀

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摘要

Biofilms of sulfate-reducing bacteria Desulfovibrio desulfu-ricans 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.
机译：硫酸盐还原细菌Desulfovibrio desulfu-ricans G20的生物膜用于还原溶解的U（VI），随后在铀络合碳酸盐存在下固定U（IV）。生物膜在三个相同操作的固定床反应器中生长，其中填充了三种类型的矿物：一种不含碳酸盐的矿物（赤铁矿）和两种含碳酸盐的矿物（方解石和白云石）。充满方解石和白云石的反应器中的碳酸盐来源是矿物质，而充满赤铁矿的反应器中的碳酸盐来源是10 mM碳酸盐缓冲液，pH 7.2，我们将其添加到生长培养基中。我们为期五个月的研究表明，尽管存在铀络合碳酸盐，但在所有反应堆中生长的硫酸盐还原生物膜都能有效地固定/还原铀。

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