| 难降解多环芳烃污染土壤的机械力化学修复 |
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| 引用本文： | 韩含,王潇,殷梦秋子,张其武,何晓曼.难降解多环芳烃污染土壤的机械力化学修复[J].环境工程,2022,40(2):100-105+112. |
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| 作者姓名： | 韩含 王潇 殷梦秋子 张其武 何晓曼 |
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| 作者单位： | 武汉理工大学 资源与环境工程学院, 武汉 430070 |
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| 基金项目： | 国家自然科学基金“难降解石油烃污染土壤机械化学修复及机理研究”(41701351)； |
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| 摘 要： | 利用机械力化学法修复多环芳烃污染土壤,以四环芳烃芘为代表污染物,研究了球磨时间和球磨转速对土壤中芘去除率的影响。当球磨时间为6 h,球磨速度为500 r/min时,土壤中芘去除率为93.78%。利用SiO2作为模拟土壤,通过对球磨前后模拟土壤的GC-MS、红外光谱和拉曼光谱分析,探索芘的降解途径和机理。机械力化学修复过程中,芘的苯环被破坏,部分中间产物为环数较少的多环芳烃(PAHs)、碳链较短的烷烃,还有部分被碳化成石墨和不定形碳。利用机械力化学法对实际污染土壤进行修复,修复后土壤中芘和荧蒽浓度分别为21.45,35.68 mg/kg。机械力化学法修复多环芳烃污染土壤具有可行性和广泛的应用前景。
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| 关 键 词： | 机械力化学法 多环芳烃 土壤修复 降解途径 |
| 收稿时间： | 2021-03-06 |
MECHANOCHEMICAL REMEDIATION OF NON-DEGRADABLE PYRENE CONTAMINATED SOIL |
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| Affiliation: | School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China |
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| Abstract: | Mechanochemical methods were used to remediate polycyclic aromatic hydrocarbons(PAHs) contaminated soil. The effects of ball-milling time and ball-milling speed on the removal rate of pyrene in soil were studied. When the milling time was 6 h and the milling speed was 500 r/min, the removal rate of pyrene in the soil was 93.78%. The synthetic soil samples using SiO2 before and after ball milling were analyzed by GC-MS, FT-IR spectra and Raman spectra. The degradation pathway and mechanism of pyrene were revealed as follows: the benzene rings of pyrene were destroyed, and some of the intermediate products were PAHs with fewer benzene rings and alkanes with shorter carbon chains, and some were carbonized into graphite and amorphous carbon. The residual concentration of pyrene and fluoranthene in soil was 21.45, 35.68 mg/kg when the site contaminated soil was remediation by mechanochemical method. Mechanochemical method provides a possible method and considerable application prospect in remediation of PAHs contaminated soil. |
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