Research on the efficiency of surfactant leaching coupled with chemical oxidation on high rings polycyclic aromatic hydrocarbons removal from coking contaminated soil

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

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6474-6481.

Research on the efficiency of surfactant leaching coupled with chemical oxidation on high rings polycyclic aromatic hydrocarbons removal from coking contaminated soil

Li Wei¹, Wang Hua-wei¹, Meng Xiang-yu¹, Yang Yue-wei^2,3, DING Hao-ran^2,3, Li Shu-peng^2,3, Liu Yuan-wen^2,3, Sun Ying-jie¹, Liu Peng^2,3, Wang Ya-nan¹

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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

chemical oxidant / coking site / polycyclic aromatic hydrocarbons (PAHs) / remediation technology / soil / surfactant

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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[J]. China Environmental Science. 2023, 43(12): 6474-6481

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