Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, Guiyang, 550001, China.
Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, Guiyang, 550001, China.
Chemosphere. 2022 Jan;286(Pt 1):131595. doi: 10.1016/j.chemosphere.2021.131595. Epub 2021 Jul 19.
Because of the high hydrophobicity, low volatility, and high sorption capacity of PAHs, their remediation in contaminated soil is challenging. Electrokinetic (EK) enhanced chemical remediation is an emerging dual technology employed in this study, using a new oxidant peroxymonosulfate (PMS) to remediate PAHs contaminated soil. Here, PMS migration under electric field and the remediation efficiency for the PAHs polluted soil were assessed. We observed that the PMS removal efficiencies (59.7%-82.8%) were higher than those with persulfate (PS) (53.9%-78.5%), indicating PMS's superior oxidation capacity for PAHs. Although oxidant PMS can decontaminate PAHs in polluted soils, its removal of PAHs was only 11.0% without the enhanced methods. The enhancements increased the removal efficiency for PAHs from 0.33 to 2.10 times. At fixed catholyte pH of 4, the highest removal efficiency (34.1%) was achieved because it enhanced PMS migration from cathode to anode. These findings suggested that PMS was a potential oxidant for EK remediation, and some enhancements must be applied in EK combined PMS remediation PAHs polluted soil.
由于多环芳烃具有高疏水性、低挥发性和高吸附能力，因此其在污染土壤中的修复具有挑战性。电动（EK）增强化学修复是本研究中采用的一种新兴双重技术，使用新型氧化剂过一硫酸盐（PMS）来修复多环芳烃污染土壤。在这里，评估了电场下 PMS 的迁移以及对多环芳烃污染土壤的修复效率。我们观察到，PMS 的去除效率（59.7%-82.8%）高于过硫酸盐（PS）（53.9%-78.5%），表明 PMS 对多环芳烃具有更高的氧化能力。尽管氧化剂 PMS 可以去除污染土壤中的多环芳烃，但如果没有增强方法，其去除多环芳烃的效率仅为 11.0%。增强方法将多环芳烃的去除效率从 0.33 提高到 2.10 倍。在固定的阴极 pH 值为 4 的情况下，去除效率最高（34.1%），因为它增强了 PMS 从阴极到阳极的迁移。这些发现表明 PMS 是 EK 修复的一种潜在氧化剂，在 EK 结合 PMS 修复多环芳烃污染土壤时必须采用一些增强方法。
