School of Science and Technology, Federal University of Rio Grande do Norte, Campus Universitario, 59078-970 Natal, Brazil.
Department of Chemical Engineering, Enrique Costa Building, Campus Universitario s/n, 13071 Ciudad Real, Spain.
J Hazard Mater. 2017 Jan 15;322(Pt B):413-420. doi: 10.1016/j.jhazmat.2016.10.032. Epub 2016 Oct 17.
This study demonstrates the application of reversible electrokinetic adsorption barrier (REKAB) technology to soils spiked with low-solubility pollutants. A permeable reactive barrier (PRB) of granular activated carbon (GAC) was placed between the anode and cathode of an electrokinetic (EK) soil remediation bench-scale setup with the aim of enhancing the removal of two low-solubility herbicides (atrazine and oxyfluorfen) using a surfactant solution (sodium dodecyl sulfate) as the flushing fluid. This innovative study focused on evaluating the interaction between the EK system and the GAC-PRB, attempting to obtain insights into the primary mechanisms involved. The obtained results highlighted the successful treatment of atrazine and oxyfluorfen in contaminated soils. The results obtained from the tests after 15days of treatment were compared with those obtained using the more conventional electrokinetic soil flushing (EKSF) technology, and very important differences were observed. Although both technologies are efficient for removing the herbicides from soils, REKAB outperforms EKSF. After the 15-day treatment tests, only approximately 10% of atrazine and oxyfluorfen remained in the soil, and adsorption onto the GAC bed was an important removal mechanism (15-17% of herbicide retained). The evaporation loses in REKAB were lower than those obtained in EKSF (45-50% compared to 60-65%).
本研究展示了可逆电动吸附屏障（REKAB）技术在添加低溶解度污染物的土壤中的应用。在电动（EK）土壤修复 bench-scale 装置的阳极和阴极之间放置了颗粒活性炭（GAC）的可渗透反应屏障（PRB），目的是使用表面活性剂溶液（十二烷基硫酸钠）作为冲洗液来增强两种低溶解度除草剂（莠去津和乙氧氟草醚）的去除效果。这项创新性研究侧重于评估 EK 系统与 GAC-PRB 之间的相互作用，试图深入了解所涉及的主要机制。获得的结果突出了成功处理受污染土壤中的莠去津和乙氧氟草醚。在处理 15 天后进行的测试中获得的结果与使用更传统的电动土壤冲洗（EKSF）技术获得的结果进行了比较，观察到了非常重要的差异。尽管这两种技术都能有效地去除土壤中的除草剂，但 REKAB 的效果优于 EKSF。在 15 天的处理测试后，土壤中仅残留约 10%的莠去津和乙氧氟草醚，吸附到 GAC 床上是一种重要的去除机制（保留了 15-17%的除草剂）。REKAB 中的蒸发损失低于 EKSF 中的损失（45-50%比 60-65%）。
