Abstract：
This prospective work focuses on the use of two different gaseous oxidants (chlorine dioxide and ozone) to remediate soil polluted with methomyl in two different applications: ex-situ and in-situ. In the first, the soil washing is integrated with the bubbling of the oxidant, while in the second, the gas was introduced by a perforated pipe located sub-superficially. Regarding the soil washing treatment, results demonstrate that direct use of ozone is not very efficient, although an important improvement is obtained following activation with hydrogen peroxide or UV light. In contrast, chlorine dioxide exhibited complete methomyl depletion from the soil, although with higher energy consumption and technical complexity compared to ozone. The direct dosing of the gaseous oxidants in perforated pipes is effective, achieving methomyl removals of 7.8 % and 9.2 % using ozone and chlorine dioxide, respectively. In these cases, soil conditions are not significantly modified, which becomes an important advantage of the technology as compared with other electrochemically assisted soil remediation process, in which large regions of the treated soil are affected by important changes in the pH or by depletion of ions. This lower impact makes these novel technologies more promising for further evaluations.
摘要：
这项前瞻性工作的重点是使用两种不同的气态氧化剂（二氧化氯和臭氧）在两种不同的应用中修复被灭多威污染的土壤：非原位和原位。在第一,土壤洗涤与氧化剂的气泡结合在一起，而在第二个，气体是通过位于表面以下的穿孔管道引入的。关于土壤洗涤处理，结果表明，直接使用臭氧不是很有效，尽管在用过氧化氢或UV光活化后获得了重要的改进。相比之下,二氧化氯从土壤中完全耗尽灭多威，尽管与臭氧相比具有更高的能耗和技术复杂性。在穿孔管道中直接添加气态氧化剂是有效的，使用臭氧和二氧化氯实现7.8%和9.2%的灭多威去除，分别。在这些情况下,土壤条件没有显著改变，与其他电化学辅助土壤修复工艺相比，成为该技术的重要优势，其中处理过的土壤的大部分区域受到pH值或离子消耗的重要变化的影响。这种较低的影响使这些新技术更有希望进行进一步的评估。
