过硫酸盐氧化去除不同土壤组分中的多环芳烃。
Removal of polycyclic aromatic hydrocarbons from different soil fractions by persulfate oxidation.
机构信息
Key Laboratory of Land Surface Pattern and Simulation, Beijing Key Laboratory of Environmental Damage Assessment and Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100101, China.
Key Laboratory of Land Surface Pattern and Simulation, Beijing Key Laboratory of Environmental Damage Assessment and Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
出版信息
J Environ Sci (China). 2019 Apr;78:239-246. doi: 10.1016/j.jes.2018.10.001. Epub 2018 Oct 12.
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.
我们的研究采用过硫酸盐氧化修复技术，从污染土壤的不同土壤组分中去除多环芳烃（PAHs）。结果表明，仅占土壤 10%的轻组中，含有 30%的 PAHs，浓度为 4352mg/kg。重组分中含有更多高分子量的 PAHs，总 PAH 浓度为 625mg/kg。氧化后，轻组中 PAHs 的去除率为 39%，重组分中接近 90%。在重组分的不同组分中，腐殖酸中含有最高浓度的 PAHs，因此，腐殖酸中 PAHs 的去除效率也最高。与轻组相比，重组分含有更多的芳香族化合物，这些化合物在氧化过程中被分解，这可能是氧化高环 PAHs 所涉及的去除机制。同样，氧化后 C=C 键的增强也可以解释轻组中高环 PAHs 去除效果不佳的原因。这些结果表明，土壤的不同组分在组成和结构上存在差异，导致 PAHs 的分布和氧化效率存在差异。
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