State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; University of Chinese Academy of Sciences, Beijing 100049, China; IRSM-CAS/HK Poly U Joint Laboratory on Solid Waste Science, Wuhan, 430071, China; Hubei province Key Laboratory of contaminated sludge and soil science and Engineering, Wuhan, 430071, China.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; Jiangsu Institute of Zoneco Co., Ltd., Yixing 214200, China.
J Hazard Mater. 2022 Aug 15;436:129156. doi: 10.1016/j.jhazmat.2022.129156. Epub 2022 May 16.
Current thermal desorption practices of hydrocarbon-contaminated soils focus on remediation efficiency and cost, with little systematic assessment of the reuse value of treated soils. This study evaluated various integrated indices of treatment cost and reuse of treated soils at three desorption temperatures. Various typical engineering and ecological characteristics closely related to soil reusability were selected to analyze the changes in various treated soils, including shear strength, Atterberg limits, particle size distribution, permeability, soil carbon, and soil biomass. A sustainability evaluation tool was developed for the greener disposal of hazardous soils considering both the treatment cost and reuse indices. Such an evaluation led to the conclusion that the contaminated soils treated at 350 °C generated the highest soil reusability with an excellent remediation efficiency. The sensitivity analysis confirmed that the tool had better stability in a common situation where the weight of the remediation cost was heavier than the soil reusability. Meanwhile, published data were input into the tool to validate its applicability under different scenarios. The results were consistent with the qualitative assessment of the literature. The tool can quantitatively select a more sustainable desorption method for the disposal and reuse of hazardous soils.
当前，受烃类污染土壤的热脱附实践主要侧重于修复效率和成本，而很少对处理后土壤的再利用价值进行系统评估。本研究评估了在三种脱附温度下，处理成本和处理后土壤再利用的各种综合指标。选择了各种与土壤再利用密切相关的典型工程和生态特征来分析各种处理后土壤的变化，包括剪切强度、界限含水率、颗粒分布、渗透性、土壤碳和土壤生物量。为了更绿色地处理危险土壤，开发了一种考虑处理成本和再利用指标的可持续性评估工具。这样的评估得出的结论是，在 350°C 下处理的污染土壤具有最高的土壤再利用率和优异的修复效率。敏感性分析证实，在修复成本权重高于土壤再利用率的常见情况下，该工具具有更好的稳定性。同时，将已发表的数据输入到工具中，以验证其在不同情况下的适用性。结果与文献的定性评估一致。该工具可以定量选择更可持续的脱附方法，用于危险土壤的处置和再利用。
