Electrokinetic techniques employ direct current electric fields to enhance the transport of amendments in low permeability porous media and have been demonstrated effective for in situ remediation of both organic contaminants and heavy metals. The application of electric potential gradients give rise to coupled chemical, hydraulic and electric fluxes, which are at the basis of the main transport mechanisms: electromigration and electroosmosis. Previous research has highlighted the significant impacts of charge interactions and fluid composition, including temperature-dependent properties such as electrolyte conductivity and density, on these transport phenomena. However, current models of electrokinetic applications often assume isothermal conditions and overlook the production of heat resulting from Joule heating.

This study provides a detailed model-based investigation, systematically exploring the effects of temperature on electrokinetic conservative and reactive transport in porous media. By incorporating temperature-dependent material properties and progressively investigating the impact of temperature on each transport mechanism, we analyze the effects of temperature variations in both 1D and 2D systems. The study reveals how temperature dynamically influences the physical, chemical and electrostatic processes controlling electrokinetic transport. A temperature increase results in a higher speed of amendments delivery by both electromigration and electroosmosis and increases the kinetics of degradation reactions. The simulations also reveal a feedback mechanism in which higher aqueous conductivity results in increased Joule heating, leading to a faster temperature rise and, subsequently, to higher electrolyte conductivity. Finally, we estimate the electric energy requirements of the system at varying temperatures and show how these changes impact the rate of contaminant removal.

电动技术采用直流电场来增强低渗透性多孔介质中改良剂的传输，并已被证明对于有机污染物和重金属的原位修复有效。电势梯度的应用产生耦合的化学、水力和电通量，这是主要传输机制：电迁移和电渗的基础。先前的研究强调了电荷相互作用和流体成分（包括电解质电导率和密度等温度相关特性）对这些传输现象的重大影响。然而，当前的动电应用模型通常假设等温条件并忽略焦耳热产生的热量。

本研究提供了基于模型的详细研究，系统地探索了温度对多孔介质中动电保守和反应传输的影响。通过结合与温度相关的材料特性并逐步研究温度对每种传输机制的影响，我们分析了一维和二维系统中温度变化的影响。该研究揭示了温度如何动态影响控制动电传输的物理、化学和静电过程。温度升高导致通过电迁移和电渗的修饰物递送速度更快，并增加降解反应的动力学。模拟还揭示了一种反馈机制，其中较高的水电导率导致焦耳热增加，从而导致更快的温升，随后导致更高的电解质电导率。最后，我们估计了系统在不同温度下的电能需求，并展示了这些变化如何影响污染物去除率。