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Effects of Mixing Granular Iron with Sand on the Kinetics of Trichloroethylene Reduction

机译：铁与砂混合对三氯乙烯还原反应动力学的影响

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摘要

A substantial cost of granular iron permeable reactive barriers is that of the granular iron itself. Cutting the iron with sand can reduce costs, but several performance issues arise. In particular, reaction rates are expected to decline as the percentage of iron in the blend is diminished. This might occur simply as a function of iron content, or mass transfer effects may play a role in a much less predictable fashion. Column experiments were conducted to investigate the performance consequences of mixing Connelly granular iron with sand using the reduction kinetics of trichloroethylene (TCE) to quantify the changes. Five mixing ratios (i.e., 100%, 85%, 75%, 50%, and 25% of iron by weight) were studied. The experimental data showed that there is a noticeable decrease in the reaction rate when the content of sand is 25% by weight (iron mass to pore volume ratio, Fe/V_P - 3548 g/L) or greater. An analysis of the reaction kinetics, using the Langmuir-Hinshelwood rate equation, indicated that mass transfer became an apparent cause of rate loss when the iron content fell below 50% by weight (Fe/V_P = 2223 g/L). Paradoxically, there were tentative indications that TCE removal rates were higher in a 15% sand + 85% iron mixture (Fe/V_P - 4416 g/L) than they were in 100% iron (Fe/V_P = 4577 g/L). This subtle improvement in performance might be due to an increase of iron surface available for contact with TCE, due to grain packing in the sand-iron mixture.
机译：粒状铁可渗透的反应性屏障的实质成本是粒状铁本身的成本。用沙子切割铁可以降低成本，但是会出现一些性能问题。特别地，随着混合物中铁的百分比降低，预计反应速率将下降。这可能只是铁含量的函数而发生，或者传质效应可能以难以预测的方式发挥作用。使用三氯乙烯（TCE）的还原动力学来量化变化，进行了柱实验以研究将康奈利铁颗粒与沙子混合的性能后果。研究了五种混合比例（即铁的重量百分比为100％，85％，75％，50％和25％）。实验数据表明，当砂含量为25％（重量）（铁质量与孔体积之比，Fe / V_P-3548 g / L）或更高时，反应速率会明显降低。使用Langmuir-Hinshelwood速率方程对反应动力学进行分析，结果表明，当铁含量降至50％（重量）以下（Fe / V_P = 2223 g / L）时，传质成为速率损失的明显原因。矛盾的是，有初步迹象表明，在15％砂+ 85％铁混合物（Fe / V_P-4416 g / L）中，TCE去除率比在100％铁中（Fe / V_P = 4577 g / L）要高。性能的细微改善可能是由于砂-铁混合物中的晶粒堆积而增加了可用于与TCE接触的铁表面。

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  • 来源
    《Ground Water Monitoring & Remediation》 |2009年第2期|56-62|共7页
  • 作者

    Erping Bi; J. F. Devlin; Bei Huang;

  • 作者单位

    School of Water Resources & Environment, China University of Geosciences, 29 Xueyuan Road, Beijing, 100083, P.R. China;

    Department of Geology, Lindley Hall, University of Kan-sas, 1475 Javhawk Blvd., Lawrence. KS 66049;

    Department of Geol-ogy, Lindley Hall, University of Kansas, 1475 Jay hawk Blvd., Law-rence, KS 66049;

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