Analytical solution of a pollutant transport model for unsaturated soil considering the effects of consolidation and temperature

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2024-03-01 DOI:10.1016/j.jconhyd.2024.104326

Guo-qing Cai , Feng-jie Yin , Shi-jie Guo , Qian-qian Liu , Yi Liu

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Abstract

The migration behavior of pollutants is affected by consolidation and temperature when using thermal desorption technology to clean contaminated sites. Based on a one-dimensional consolidation model for unsaturated soil and the traditional heat conduction equation, a pollutant transport model accounting for the combined effects of consolidation and temperature was established in this paper. An analytical solution was obtained by using the separation of variables method and the integral transformation method. In addition, the correctness of the proposed model was verified via a comparison between the existing analytical solution and the theoretical model. Finally, adopting benzene as the research object, the influence of different factors on pollutant migration was studied. It was found that the growth rate of the pollutant concentration increased with increasing consolidation pressure, and the final pollutant concentration decreased with increasing consolidation pressure. The pollutant concentration increment due to temperature first increased and then decreased with increasing migration distance. The higher the Soret coefficient and volumetric moisture content are, the higher the pollutant concentration.

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考虑固结和温度影响的非饱和土壤污染物迁移模型的解析解

使用热解吸技术清理污染场地时，污染物的迁移行为会受到固结和温度的影响。本文基于非饱和土壤的一维固结模型和传统的热传导方程，建立了一个考虑固结和温度综合影响的污染物迁移模型。利用变量分离法和积分变换法获得了解析解。此外，通过比较现有的解析解和理论模型，验证了所提模型的正确性。最后，以苯为研究对象，研究了不同因素对污染物迁移的影响。研究发现，污染物浓度的增长率随固结压力的增加而增加，最终污染物浓度随固结压力的增加而降低。随着迁移距离的增加，温度引起的污染物浓度增量先增加后减少。索雷特系数和体积含水量越高，污染物浓度越高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567