Department of Science, Natural Resources and Outdoor Studies, University of Cumbria, Bowerham Road LA1 3JD, United Kingdom.
Department of Engineering, Lancaster University, Bailrigg LA1 4YR, United Kingdom.
J Hazard Mater. 2017 Oct 15;340:454-462. doi: 10.1016/j.jhazmat.2017.07.007. Epub 2017 Jul 6.
This work describes the first known the use of electrokinetic treatments and ionic salt washes to remediate concrete contaminated with Cs. A series of experiments were performed on concrete samples, contaminated with K and Cs, using a bespoke migration cell and an applied electric field (60V potential gradient and current limit of 35mA). Additionally, two samples were treated with an ionic salt wash (≤400molm of KCl) alongside the electrokinetic treatment. The results show that the combined treatment produces removal efficiencies three times higher (>60%) than the electrokinetic treatment alone and that the decontamination efficiency appears to be proportional to the initial degree of contamination. Furthermore, the decontamination efficiencies are equivalent to previous electrokinetic studies that utilised hazardous chemical enhancement agents demonstrating the potential of the technique for use on nuclear licensed site. The results highlight the relationship between the initial contamination concentration within the concrete and achievable removal efficiency of electrokinetic treatment and other treatments. This information would be useful when selecting the most appropriate decontamination techniques for particular contamination scenarios.
本工作描述了首例使用电动处理和离子盐洗来修复被 Cs 污染的混凝土的方法。采用定制的迁移单元和外加电场（60V 电位梯度和 35mA 的电流限制），对受 K 和 Cs 污染的混凝土样品进行了一系列实验。此外，对两个样品进行了电动处理和离子盐洗（≤400molm 的 KCl）的联合处理。结果表明，联合处理的去除效率比单独电动处理高三倍以上（＞60%），且去污效率似乎与初始污染程度成正比。此外，该去污效率与先前使用危险化学增强剂的电动研究相当，这证明了该技术在核许可现场应用的潜力。这些结果突出了混凝土内初始污染浓度与电动处理和其他处理的可实现去除效率之间的关系。在选择特定污染情况下最适宜的去污技术时，这些信息将是有用的。
