Removal of polycyclic aromatic hydrocarbons from different soil fractions by persulfate oxidation

作     者：Xiaoyong Liao Qiongzhi Liu You Li Xuegang Gong Hongying Cao 

作者机构：Key Laboratory of Land Surface Pattern and SimulationBeijing Key Laboratory of Environmental Damage Assessment and RemediationInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of Science University of Chinese Academy of Sciences 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2019年第31卷第4期

页      面：239-246页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 

基　　金：supported by the Key Research Program of the Chinese Academy of Sciences (No. ZDRW-ZS-2016-5-5) the Key Research Program of the Chinese Academy of Sciences (No. KFZD-SW-303) the Science and Technology Plan of Beijing (No. D16110900470000) 

主　　题：Soil fraction Persulfate oxidation PAHs Organic matter Bond 

摘      要：Removal of polycyclic aromatic hydrocarbons(PAHs) from different soil fractions of contaminated soil was investigated by using activated persulfate oxidation remediation in our research. The results showed that the light fraction, which accounted for only 10% of the soil, contained 30% of the PAHs at a concentration of 4352 mg/kg. The heavy fraction contained more high-molecular-weight PAHs, and the total PAH concentration was 625 mg/kg. After being oxidized, the removal rate of PAHs was 39% in the light fraction and nearly 90% in the heavy fraction. Among the different fractions of the heavy fraction,humic acid contained the highest concentration of PAHs, and consequently, the highest removal efficiency of PAHs was also in humic acid. Compared with the light fraction, the heavy fraction has more aromatic compounds and those compounds were broken down during the oxidation process, which may be the removal mechanism involved in the oxidation of high-ring PAHs. Similarly, the enhancement of C= C bonds after oxidation can also explain the poor removal of high-ring PAHs in the light fraction. These results imply that different fractions of soil vary in composition and structure, leading to differences in the distribution and oxidation efficiencies of PAHs.