Soil pollution by diesel fuels is a worldwide environmental problem, but little research has been carried out into on-site techniques for remediation of soil polluted by waste solvents. This study compared chemical oxidation and soil washing methods for their efficiency and environmental and economic impacts. Soil was spiked with 0# diesel to simulate an actual pollution level of about 1260 mg/kg total petroleum hydrocarbon (TPH). Fenton-like oxidation eliminated 90.4% of the TPH with a Fe2+:H2O2 ratio of 1:10 in 5 d compared with 25.8% removal by the activated persulfate method under the same conditions. In washing tests, sodium dodecylbenzenesulfonate and Tween 80 were both unsuitable for TPH washing, while ultrapure water removed 36.1% of TPH in 75 min. Only the Fenton-like oxidation technique met remediation goals based on the screening values of the Guideline for Risk Assessment of Contaminated Sites. The environmental impact and economic assessment of techniques demonstrated the superiority of water washing for dealing with low-degree TPH contamination.
选用实际废溶剂污染土作为研究对象, 使用两种经典原位修复技术(化学氧化/淋洗), 并结合效果、 环境友好性和经济性三个方面, 对该类土壤的修复提出经济性建议.
1. 采用控制变量法, 分别改变试剂浓度、 剂量和配比, 并控制其他因素不变, 以探究不同因素对石油烃去除效果的影响; 2. 采用单因素方差分析, 分析数据之间的显著性, 得出各种方法的最佳条件.
1. 类芬顿氧化技术适用于石油烃高污染土壤的修复, 而石油烃低污染程度(<916 mg/kg)的土壤仅用水洗法即可达到修复效果. 2. 从施加修复技术对环境的影响、 生态毒性和可生物降解性等方面考虑, 活化过硫酸盐法和水洗法最适用于该污染场地的修复.
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Project supported by the Science and Technology Research Program of Zhejiang Province (No. 2020C03011), the National Natural Science Foundation of China (No. 21621005), and the National Key Research and Development Program of China (No. 2017YFA0207003)
Fan-xu MENG and Dao-hui LIN designed the research. Fan-xu MENG and Yan SONG conducted the experiments. Li-juan MAO provided the instrumental analysis method. Wen-jun ZHOU helped to organize the manuscript. Dao-hui LIN revised and edited the final version.
Conflict of interest
Fan-xu MENG, Yan SONG, Li-juan MAO, Wen-jun ZHOU, and Dao-hui LIN declare that they have no conflict of interest.
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Meng, Fx., Song, Y., Mao, Lj. et al. A comparative study of methods for remediation of diesel-contaminated soil. J. Zhejiang Univ. Sci. A 22, 792–804 (2021). https://doi.org/10.1631/jzus.A2100087
- Total petroleum hydrocarbon (TPH)
- Chemical oxidation
- Soil washing
- Environmental risk
- Soil remediation