表面活性剂淋溶-化学氧化处理焦化场地高环多环芳烃污染土壤

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摘要为了探究表面活性剂淋溶-化学氧化技术对焦化场地有机污染土壤的修复效能,以安徽某焦化场地多环芳烃(PAHs)污染土壤为实验对象,分析了表面活性剂浓度、液固比、淋溶时间和淋溶次数等工艺参数对淋溶效果的影响,在优化工艺参数的基础上,进一步研究了化学氧化对PAHs的去除效能.结果表明:1)吐温80(TW80)对PAHs污染土壤的淋溶效果优于曲拉通和鼠李糖脂,用于后续实验; 2)当TW80浓度为6g/L,液固比为10:1,淋溶时间为4h时为最佳工艺参数,此时ΣPAHs的淋溶效率为43.5%; 3)多次淋溶有助于提高PAHs的淋溶效率,连续淋溶3次后ΣPAHs的淋溶效率为63.3%,淋溶5次时淋溶率升高至72.1%; 4)TW80淋溶5次,采用10%的H₂O₂氧化处理后ΣPAHs去除率为79.4%,而采用10% KMnO₄氧化处理后ΣPAHs去除率为81.2%,其中苯并[a]芘去除率为98.3%;5) TW80淋溶处理后,H₂O₂或KMnO₄氧化处理均能提高PAHs的去除效率,淋溶5次+1% H₂O₂和淋溶3次+1% KMnO₄处理后苯并[a]芘含量分别为0.39和0.46mg/kg,均满足《土壤环境质量建设用地土壤污染风险管控标准(试行)》(GB 36600-2018) 第一类用地筛选值要求; 6)表面活性剂淋溶+化学氧化技术对PAHs去除效果良好,该技术在PAHs污染土壤修复具有潜在的应用前景.

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	李伟
	王华伟
	孟祥宇
	杨乐巍
	丁浩然
	李书鹏
	刘渊文
	孙英杰
	刘鹏
	王亚楠

关键词 ：焦化场地, 多环芳烃(PAHs), 表面活性剂, 化学氧化, 修复技术, 土壤

Abstract：In order to explore the remediation efficiency of surfactant leaching combined with chemical oxidation technology on the treatment of organic polluted soil in coking sites, the polycyclic aromatic hydrocarbons (PAHs) contaminated soil in a coking site in Anhui Province was taken as the experimental object, and the effect of process parameters such as surfactant concentration, liquid-solid ratio, leaching time and number of leaching on the leaching efficiency was analyzed. On the basis of optimizing the process parameters, the efficiency of chemical oxidation on the removal of PAHs was further investigated. The results showed that: 1) Tween 80 (TW80) was more effective than Triton and rhamnolipid in leaching PAHs from soil, which was used for subsequent experiments; 2) The removal efficiency of ΣPAHs was 43.5% when the concentration of TW80was 6g/L, the liquid-solid ratio was 10:1and the leaching time was 4h; 3) Multiple leaching was helpful for improving the leaching efficiency of PAHs, and the leaching efficiencies of ΣPAHs were 63.3% and 72.1% after three and five times leaching, respectively; 4) The removal efficiency of ΣPAHs increased to 79.4% after TW80 leaching five times combined with the oxidation of 10% H₂O₂, while the ΣPAHs removal efficiency increased to 81.2% after oxidation treatment with 10% KMnO₄, in which the benzo[a]pyrene removal efficiency was 98.3%; 5) After TW80 leaching treatment, the combination of H₂O₂ or KMnO₄ oxidation treatment can improve the removal efficiency of PAHs, the content of benzo[a]pyrene was 0.39mg/kg and 0.46mg/kg after five times leaching combined with 1% H₂O₂ and three times leaching combined with 1% KMnO₄, respectively, which can met the screening value requirement of soil environmental quality risk control standard for soil contamination of development land (GB36600-2018); 6) The combination of surfactant leaching with chemical oxidation technology has a good efficiency on PAHs removal. This technology has a potential application prospect on the remediation of PAHs contaminated soil.

Key words： coking site polycyclic aromatic hydrocarbons (PAHs) surfactant chemical oxidant remediation technology soil

收稿日期: 2023-05-16

PACS:

X53

基金资助:国家重点研发计划(2020YFC1807905);东营市科技计划项目(2022ZD20);国家自然科学基金资助项目(52370173)

通讯作者: 王华伟,副教授,wanghuawei210@163.com E-mail: wanghuawei210@163.com

作者简介: 李伟(1995-),男,内蒙古锡林郭勒盟人,青岛理工大学硕士研究生,主要研究方向为污染场地修复.liwei19952022@163.com.

引用本文:

李伟, 王华伟, 孟祥宇, 杨乐巍, 丁浩然, 李书鹏, 刘渊文, 孙英杰, 刘鹏, 王亚楠. 表面活性剂淋溶-化学氧化处理焦化场地高环多环芳烃污染土壤[J]. 中国环境科学, 2023, 43(12): 6474-6481. Li Wei, Wang Hua-wei, Meng Xiang-yu, Yang Yue-wei, DING Hao-ran, Li Shu-peng, Liu Yuan-wen, Sun Ying-jie, Liu Peng, Wang Ya-nan. Research on the efficiency of surfactant leaching coupled with chemical oxidation on high rings polycyclic aromatic hydrocarbons removal from coking contaminated soil. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(12): 6474-6481.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I12/6474

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