热增强土壤蒸气萃取法结合混砂法修复受石油碳氢化合物污染的低渗透性土壤的机制

IF 2.6 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Ying Yu, Wenhui Kang, Jianan Song, Zhenli He, Jianguo Wang, Yu Liu, Zhiyu Yan
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引用次数: 0

摘要

热增强土壤蒸气萃取(T-SVE)与混砂技术相结合,是一种用于修复受有机污染物污染的低渗透性土壤的替代技术。本研究建造了一个带有大型加热筒的 T-SVE 装置,用于探索 n-C11 和 C13-16 烷烃类典型石油烃的去除机理,并利用 CMG-STARS 软件模拟了 T-SVE 运行期间热量在土壤中传播的动力学过程。T-SVE运行6天后,大部分土壤中正烷烃的浓度梯度曲线与其等温等值线几乎重合,这表明导热性对T-SVE的修复效率起着至关重要的作用。提取气体中正烷烃的瞬时浓度波动很大,土壤中 90% 以上的加标正烷烃被去除。尽管有机质对传热的影响很小,但有机质含量较低的土壤中正烷烃的滞留率较低,因此正烷烃更容易被去除。与此相反,研究中采用的较高土壤湿度在最初 2 天由于水分蒸发引起的热量消耗而延缓了传热。但在最后 4 天,湿度较高的土壤平均温度明显升高,尤其是在能量输入较少的区域。这是因为土壤温度主要由热传导决定,仍被水占据的土壤孔隙更有利于热传导,从而促进了正构烷烃的蒸发,最终提高了修复效率。合适的原始土壤水分对于 T-SVE 修复低渗透性土壤和混砂非常重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Mechanism for Remediation of Low-Permeable Soil Contaminated with Petroleum Hydrocarbons by Thermally-Enhanced Soil Vapor Extraction Combined with Sand Mixing

The Mechanism for Remediation of Low-Permeable Soil Contaminated with Petroleum Hydrocarbons by Thermally-Enhanced Soil Vapor Extraction Combined with Sand Mixing

Thermally-enhanced soil vapor extraction (T-SVE) combined with sand mixing is an alternative technology for remediating low-permeable soil polluted by organic contaminants. In this study, a T-SVE apparatus with a large heating cylinder was constructed for exploring removal mechanisms of typical petroleum hydrocarbons of n-C11 and C13−16 alkanes, and dynamics of heat propagation within soils during T-SVE operation was simulated by CMG-STARS software. After 6 days of T-SVE, most of the soil concentration-gradient curves of n-alkanes almost coincided with their isothermal contours, suggesting the crucial role of heat conductivity on T-SVE remediation efficiency. The instantaneous concentration of n-alkanes in extracted gas showed great fluctuations, and higher than 90% of spiked n-alkanes was removed from soils. n-alkanes were more easily eliminated from soil with lower organic matter due to the less retention ratio despite the trivial impact of organic matter on heat transfer. By contrast, the higher soil moisture adopted in the study retarded heat transfer in the initial 2 days due to thermal consumption induced by water evaporation. During the last 4 days, however, the average temperature of more humid soil was obviously elevated, especially in the zones receiving less energy input. It was attributed to the fact that soil temperature was mainly determined by heat conduction, and soil pores still occupied by water were more beneficial for heat conduction, leading to the promoted evaporation of n-alkane and therefore eventual remediation efficiency. Suitable original soil moisture is important for T-SVE remediating low-permeable soil combined with sand mixing.

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来源期刊
CiteScore
5.40
自引率
0.00%
发文量
104
审稿时长
1.7 months
期刊介绍: International Journal of Environmental Research is a multidisciplinary journal concerned with all aspects of environment. In pursuit of these, environmentalist disciplines are invited to contribute their knowledge and experience. International Journal of Environmental Research publishes original research papers, research notes and reviews across the broad field of environment. These include but are not limited to environmental science, environmental engineering, environmental management and planning and environmental design, urban and regional landscape design and natural disaster management. Thus high quality research papers or reviews dealing with any aspect of environment are welcomed. Papers may be theoretical, interpretative or experimental.
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