Numerical simulation of copper-contaminated sediment consolidation and remediation through vacuum electro-osmosis

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2025-03-01 DOI:10.1016/j.gete.2025.100655

Yang Shen, Wencheng Qi, Shaoyu Li, Zilin Yang, Kaijia Chen

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Abstract

The combination of vacuum electro-osmosis treatment and electrokinetic remediation allows for the simultaneous consolidation and remediation of contaminated sediments, involving multiple coupled fields such as electrical field, hydraulic field, mechanical field, and chemical field. This study couples the charge conservation, vacuum electro-osmosis consolidation, and contaminant transport equations under vacuum electro-osmosis conditions to establish a numerical model for the consolidation and remediation process. Laboratory experiments were conducted for comparative analyses. The numerical results show that the electric field intensity decays from both sides towards the center. However, the other positions align well with the experimental results, indicating the ability of the numerical model to reflect the non-uniform distribution of soil potential. The anode and cathode regions become negative pressure centers, resulting in an increasing seepage velocity towards the negative pressure centers. The numerical results accurately capture the trend of pore water pressure development before 40 h, although the absolute value obtained after 40 h is slightly overestimated. Additionally, the numerical results demonstrate a 47% removal efficiency of copper at the anode after 48 h, which is consistent with the experimental results. The distribution of electric field and contaminants are affected by the shape of the electrode board.

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铜污染沉积物固结和真空电渗修复的数值模拟

真空电渗透处理与电动修复相结合，可以同时对污染沉积物进行固结和修复，涉及电场、水力场、机械场、化学场等多个耦合场。本研究将真空电渗透条件下的电荷守恒、真空电渗透固结和污染物输运方程耦合，建立了固结和修复过程的数值模型。进行了实验室实验进行对比分析。数值结果表明，电场强度从两侧向中心衰减。但其他位置与试验结果吻合较好，说明数值模型能够反映土壤电位的非均匀分布。阳极和阴极区域成为负压中心，导致向负压中心的渗透速度增加。数值结果较准确地反映了40 h前孔隙水压力的发展趋势，但40 h后的绝对值略高估。另外，数值结果表明，48 h后阳极处铜的去除率为47%，与实验结果一致。电场和污染物的分布受电极板形状的影响。

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.