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Early breakthrough of molybdenum and uranium in a permeable reactive barrier

机译：钼和铀在可渗透反应堆中的早期突破

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摘要

A permeable reactive barrier (PRIB) using zerovalent iron (ZVI) was installed at a site near Canon City, CO, to treat molybdenum (Mo) and uranium (U) in groundwater. The PRB initially decreased Mo concentrations from about 4.8 to less than 0.1 mg/L; however, Mo concentrations in the ZVI increased to 2.0 mg/L after about 250 days and continued to increase until concentrations in the ZVI were about 4 times higher than in the influent groundwater, Concentrations of U were reduced from 1.0 to less than 0.02 mg/L during the same period. Investigations of solid-phase samples indicate that (1) calcium carbonate, iron oxide, and sulfide minerals had precipitated in pores of the ZVI; (2) U and Mo were concentrated in the upgradient 5.1 cm of the ZVI; and (3) calcium was present throughout the ZVI accounting for up to 20.5% of the initial porosity. Results of a column test indicated that the ZVI from the PRB was still reactive for removing Mo and that removal rates were dependent on residence time and pH. The chemical evolution of the PRB is explained in four stages that present a progression from porous media flow through preferential flow and, finally, complete bypass of the ZVI.
机译：使用零价铁（ZVI）的可渗透反应性屏障（PRIB）安装在科罗拉多州佳能市附近的地点，用于处理地下水中的钼（Mo）和铀（U）。 PRB最初将Mo的浓度从约4.8降低至小于0.1 mg / L。但是，ZVI中的Mo浓度在约250天后增加到2.0 mg / L，并持续增加，直到ZVI中的浓度比流入地下水中的Mo高约4倍，U的浓度从1.0降低至小于0.02 mg / L。 L在同一时期。固相样品的研究表明：（1）ZVI的孔中沉淀有碳酸钙，氧化铁和硫化物； （2）U和Mo集中在ZVI上升5.1 cm处； （3）整个ZVI中都存在钙，占初始孔隙率的20.5％。柱测试的结果表明，PRB中的ZVI仍具有去除Mo的反应性，去除速度取决于停留时间和pH。 PRB的化学演化分为四个阶段，从多孔介质流到优先流，再到ZVI的完全旁路，呈现出一个过程。

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