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Impact of nZVI stability on mobility in porous media

机译：nZVI稳定性对多孔介质中迁移率的影响

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摘要

Nano-scale zero valent iron (nZVI) has received significant attention because of its potential to rapidly reduce a number of priority source zone contaminants. In order to effectively deliver nZVI to the source zone the nZVI particles must be stable. Previous laboratory studies have demonstrated the mobility of polymer modified suspensions of low concentration nZVI. More recently studies have shown potential for higher concentration nZVI suspensions to be transmitted through porous media. However, with increasing nZVI concentration aggregation is accelerated, reducing the available time for injection before nZVI settles. In this study the colloidal stability and mobility of nZVI concurrently synthesized and stabilized in the presence of carboxy-methyl-cellulose (CMC) are evaluated in one-dimensional column experiments. Low pore water velocity nZVI injections (4,2, and 0.25 m/day) conducted over periods as long as 80 h with no mixing of the influent reservoir were used to investigate the effects of prolonged aggregation and settling of colloids on transport. A numerical simulator, based on colloid filtration theory, but accounting for particle aggregation and settling was used to evaluate the contributions of aggregation and settling on nZVI mobility. Results suggest that the prediction of nZVI sticking efficiency in column experiments becomes increasingly influenced by aggregation and settling in the influent reservoir as the period of injection increases. Consideration of nZVI stability is required for the prediction of nZVI mobility at the field scale and for the design of successful nZVI remediation plans.
机译：纳米级零价铁（nZVI）由于其可以迅速减少许多优先源区污染物的潜力而备受关注。为了有效地将nZVI传递到源区，nZVI粒子必须稳定。先前的实验室研究表明，低浓度nZVI聚合物改性的悬浮液具有迁移性。最近的研究表明，更高浓度的nZVI悬浮液可以通过多孔介质传输。但是，随着nZVI浓度的增加，聚集加快了，从而减少了nZVI沉淀之前的可用注射时间。在这项研究中，在一维柱实验中评估了在羧甲基纤维素（CMC）存在下同时合成和稳定的nZVI的胶体稳定性和迁移率。低渗水速度nZVI注入（4,2和0.25 m /天）在长达80 h的时间内进行，没有混合进水层，用于研究胶体长时间聚集和沉降对运输的影响。一个基于胶体过滤理论但考虑了颗粒聚集和沉降的数值模拟器用于评估聚集和沉降对nZVI迁移率的贡献。结果表明，随着注入时间的延长，柱实验中对nZVI黏附效率的预测越来越受到流入水库中聚集和沉降的影响。在现场规模上预测nZVI的流动性以及设计成功的nZVI修复计划时，需要考虑nZVI的稳定性。

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  • 来源
    《Journal of Contaminant Hydrology》 |2013年第2期|17-25|共9页
  • 作者

    Chris M. Kocur; Denis M. OCarroll; Brent E. Sleep;

  • 作者单位

    Civil and Environmental Engineering, Western University, 1151 Richmond Rd., London, ON. Canada NBA 5B8;

    Civil and Environmental Engineering, Western University, 1151 Richmond Rd., London, ON. Canada NBA 5B8;

    Civil Engineering, University of Toronto, 35 St George St. Toronto, ON, Canada M5S 1A4;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nanoparticles; zero valent iron; carboxymethyl cellulose; stability; mobility; nZVI;

    机译：纳米粒子零价铁羧甲基纤维素;稳定性;流动性零VI;

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