Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Shanghai Jierang Environmental Protection Technology Co., Ltd., Shanghai 201615, China.
J Hazard Mater. 2021 Apr 15;408:124845. doi: 10.1016/j.jhazmat.2020.124845. Epub 2020 Dec 14.
Persulfate-based chemical oxidation of petroleum hydrocarbons (TPHs) in soils usually varies drastically with soil sites. Complex effects of soil components on persulfate oxidation of TPHs remains poorly understood, impeding the understanding of persulfate oxidation in practical systems. Here we provided empirical evidence for the interrelated effects of natural soils components and target TPHs on persulfate oxidation of TPHs. Inputs of TPHs led to notable alterations of organic matter, minerals and pH of soils, which in turn influenced distributions and availability of TPHs in soils. These soil/TPH properties and oxidant dose constituted five interrelated terms that were used to develop a predictive model of persulfate oxidation of TPHs. Such interrelation accounted for ilmenite-base coupling activation of persulfate oxidation, Fe/Mn mineral activation of persulfate oxidation, chemical oxidant demand of soils, mass transfer-reactivity limiting of TPHs, and applicable parameters of persulfate oxidation, respectively. The interrelation-based model of persulfate oxidation of TPHs displayed high predictive accuracy of 43% for a factor of 0.3 above and below the ideal fit, despite large differences in contaminated sites and applicable parameters. This finding may have practical interests in the optimization of persulfate oxidation.
过硫酸盐氧化法是一种常用于修复土壤中石油烃（TPHs）污染的化学方法，但该方法在不同土壤中的效果差异较大。土壤成分对过硫酸盐氧化 TPHs 的复杂影响仍不清楚，这阻碍了对实际系统中过硫酸盐氧化的理解。本研究提供了土壤天然成分和目标 TPHs 对过硫酸盐氧化 TPHs 的相互作用的经验证据。TPHs 的输入导致土壤中有机质、矿物质和 pH 值发生显著变化，进而影响 TPHs 在土壤中的分布和可用性。这些土壤/TPH 特性和氧化剂剂量构成了五个相互关联的术语，用于开发 TPHs 过硫酸盐氧化的预测模型。这种相互关系分别解释了钛铁矿基耦合对过硫酸盐氧化的激活作用、Fe/Mn 矿物对过硫酸盐氧化的激活作用、土壤的化学氧化剂需求、TPHs 的质量转移-反应性限制以及过硫酸盐氧化的适用参数。基于相互关系的 TPHs 过硫酸盐氧化模型尽管在污染场地和适用参数方面存在很大差异，但仍具有 43%的高预测准确性，适用于理想拟合上下 0.3 倍的因子。这一发现可能对过硫酸盐氧化的优化具有实际意义。
