One-dimensional non-isothermal diffusion model for organic pollutant in an unsaturated composite liner considering the degradation effect

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-10-09 DOI:10.1016/j.compgeo.2024.106807
Wenhao Jiang , Shangqi Ge , Jiangshan Li
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Abstract

In this article, a one-dimensional non-isothermal diffusion model for organic pollutant in an unsaturated composite liner (comprising a geomembrane and an unsaturated compacted clay liner (CCL)) considering the degradation effect is established, which also includes the impacts of temperature on diffusion-related parameters, and employs a water content and pore-water pressure head relationship equation that better matches the experimental results. Subsequently, this model is addressed through a finite-difference technique, and its reasonableness is proved by comparing with the experiment measurements and two other calculation approaches. Following this, the analyses suggest that the diffusion coefficients’ change induced by a rising temperature accelerates the diffusion rate, whereas such an alteration on partitioning coefficients has an opposite effect. Furthermore, the evaluation reveals that the non-isothermal state caused by an increasing upper temperature overall lowers the anti-fouling performance. The unsaturated composite liner’s barrier function is weakened by an increment in residual water content of CCL, but enhanced by unsaturated layer thickness. It is also detected that the degradation effect should be considered if the degradation half-life ≤ 100 years. Lastly, a simplified approach for assessing the unsaturated composite liner’s barrier performance is presented, which can provide guidance for its engineering design in a non-isothermal scenario.
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考虑降解效应的有机污染物在非饱和复合衬垫中的一维非等温扩散模型
本文建立了考虑降解效应的有机污染物在非饱和复合衬垫(由土工膜和非饱和压实粘土衬垫组成)中的一维非等温扩散模型,其中还包括温度对扩散相关参数的影响,并采用了与实验结果更匹配的含水率和孔隙水压头关系式。随后,通过有限差分技术对该模型进行了处理,并通过与实验测量结果和其他两种计算方法的比较,证明了该模型的合理性。随后的分析表明,温度升高引起的扩散系数变化会加快扩散速度,而这种变化对分配系数的影响恰恰相反。此外,评估结果还显示,上限温度升高导致的非等温状态总体上降低了防污性能。不饱和复合衬垫的阻隔功能会因 CCL 剩余含水量的增加而减弱,但会因不饱和层厚度的增加而增强。研究还发现,如果降解半衰期≤ 100 年,则应考虑降解效应。最后,提出了评估非饱和复合衬垫阻隔性能的简化方法,可为非等温情况下的工程设计提供指导。
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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