Department of Environmental Engineering, Kwangwoon University, Seoul, 01897, Republic of Korea.
Department of Environmental Engineering, Kwangwoon University, Seoul, 01897, Republic of Korea; Institute of Global Environment Kyunghee University, Seoul, 03134, Republic of Korea.
J Environ Manage. 2022 Sep 1;317:115403. doi: 10.1016/j.jenvman.2022.115403. Epub 2022 Jun 1.
Benzo[a]pyrene (BaP) is a major indicator of soil contamination and categorized as a highly persistent, carcinogenic, and mutagenic polycyclic aromatic hydrocarbon. An advanced peroxyacid oxidation process was developed to reduce soil pollution caused by BaP originating from creosote spills from railroad sleepers. The pH, organic matter, particle size distribution of soil, and concentrations of BaP and heavy metals (Cd, Cu, Zn, Pb, and As) in the BaP-contaminated soils were estimated. A batch experiment was conducted to determine the effects of organic acid type, soil particle size, stirring speed, and reaction time on the peroxyacid oxidation of BaP in the soil samples. Additionally, the effect of the organic acid concentration on the peroxyacid degradation of BaP was investigated using an oxidizing agent in spiked soil with and without hydrogen peroxide. The results of the oxidation process indicated that BaP and heavy metal residuals were below acceptable Korean standards. A significant difference in the oxidative degradation of BaP was observed between the spiked and natural soil samples. The formation of a peroxyacid intermediate was primarily responsible for the enhanced BaP oxidation. Further, butyric acid could be reused thrice without losing the efficacy (<90%). The systematic peroxyacid oxidative degradation mechanism of BaP was also discussed. A qualitative analysis of the by-products of the BaP reaction was conducted, and their corresponding toxicities were determined for possible field applications. The findings conclude that the developed peroxyacid oxidation method has potential applications in the treatment of BaP-contaminated soils.
苯并[a]芘（BaP）是土壤污染的主要指标，被归类为高度持久性、致癌性和致突变性多环芳烃。开发了一种先进的过氧酸氧化工艺，以减少铁路枕木中防腐油泄漏导致的 BaP 对土壤造成的污染。对受 BaP 污染土壤的 pH 值、有机质、粒径分布以及 BaP 和重金属（Cd、Cu、Zn、Pb 和 As）浓度进行了估算。进行了批处理实验，以确定有机酸类型、土壤粒径、搅拌速度和反应时间对土壤样品中 BaP 过氧酸氧化的影响。此外，还研究了在添加和不添加过氧化氢的污染土壤中，有机酸浓度对过氧酸降解 BaP 的影响。氧化过程的结果表明，BaP 和重金属残留均低于韩国可接受标准。在添加和天然土壤样品中，BaP 的氧化降解存在显著差异。过氧酸中间体的形成主要导致 BaP 的氧化增强。此外，丁酸在不失活（<90%）的情况下可重复使用三次。还讨论了 BaP 的系统过氧酸氧化降解机制。对 BaP 反应的副产物进行了定性分析，并确定了它们的相应毒性，以用于可能的现场应用。研究结果表明，所开发的过氧酸氧化方法在处理 BaP 污染土壤方面具有潜在的应用前景。
