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首页> 外文期刊>Journal of Environmental Engineering >Zero-valent iron colloid emplacement in sand columns
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Zero-valent iron colloid emplacement in sand columns

机译：砂柱中零价铁胶体的位置

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摘要

Studies were conducted to evaluate a novel approach of emplacing chemically reactive barriers composed of zero-valent iron (Fe-0) by injecting suspensions of colloidal-size Fe-0 particles into porous media. The specific objective of this study was to evaluate the effect of influent colloid concentration, rate, and volume of colloidal suspensions on Fe-0 colloid emplacement in sand columns. Relatively even distributions of Fe-0 throughout a sand column were obtained at low influent colloid concentrations and high injection rates. As the concentration of influent suspension was increased, a point was reached beyond which a significant increase in the filtration of Fe-0 particles near the front of the column was observed. This point was also found to occur at lower influent colloid concentrations as the injection rate was decreased, i.e., there was an interactive effect of influent colloid concentration and injection rate on the extent of filtration that occurred near the front of the column. As the volume of the colloidal suspension injected into the column was increased, the distribution of Fe-0 colloids within the column became increasingly even.
机译：进行了研究以评估通过将胶体大小的Fe-0颗粒的悬浮液注入多孔介质中来形成由零价铁（Fe-0）组成的化学反应性屏障的新方法。这项研究的特定目的是评估进水胶体浓度，流速和胶体悬浮液体积对砂柱中Fe-0胶体的影响。在低进水胶体浓度和高注入速率下，整个沙柱中的Fe-0分布相对均匀。随着进水悬浮液浓度的增加，达到了一个点，超过该点，观察到柱前附近的Fe-0颗粒过滤明显增加。还发现，随着进样速度的降低，这一点发生在较低的进样胶体浓度下，即进样胶体浓度和进样速率对靠近柱前的过滤程度有相互作用的影响。随着注入柱中的胶体悬浮液体积的增加，柱中Fe-0胶体的分布变得越来越均匀。

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