环境修复
过硫酸盐
氧化钙
环境化学
环境科学
污染
钙
土壤污染
化学
土壤水分
土壤科学
生态学
生物
有机化学
催化作用
作者
Heng Zhang,Li Li,Jiangyun Wang,Yingdong Fu,Jing Wang
摘要
Polycyclic aromatic hydrocarbons (PAHs) have received significant attention due to their high toxicity and environmental persistence in recent years. Chemical oxidation is considered as an effective method and has been widely applied to the remediation of soils contaminated with PAHs. Among all the possible oxidizing agents, there is an increasing interest in using activated persulfate (PS) for the remediation purpose. Common methods of activating persulfate include heat, alkaline conditions, and metal ions. Considering that calcium oxide (CaO) working as activator is able to provide both thermal and alkaline environments simultaneously, in this study, we investigated the effectiveness of using CaO as an activator of persulfate for the remediation of PAH-contaminated soils. The key parameters that influencing the efficiency of the CaO/PS activation system along with the impact of soil types are examined. The findings demonstrate that the CaO/PS activation system is effective in the remediation of PAH-contaminated soils, and the highest removal rate reaches 69.15%. Compared with silt and clay, the remediation efficiency of the CaO/PS activation system is highest in sand. Based on the study, the thermal activation mechanism was identified as the predominant factor contributing to the efficacy of this system.
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