4.6 Article

Multi-dimensional modeling of H+ and OH- mass transfer during soil electro-kinetic remediation

期刊

JOURNAL OF SOILS AND SEDIMENTS
卷 23, 期 8, 页码 3124-3136

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s11368-023-03531-w

关键词

Electro-kinetic remediation; Mass transfer; Porous fluid flow; Heavy metal; Soil remediation

向作者/读者索取更多资源

In this study, multi-dimensional (1D and 2D) models were used to investigate the coupled relationship among H+ and OH- mass transfer, electric field, and porous fluid flow in soil electro-kinetic remediation (EKR). The results showed that the characteristics of pH front and pH profile were dominated by electric field, mass transfer, and porous fluid flow. The conductivity rise and electric field distribution variations were quantified and found to be caused by the H+ and OH- mass transfer.
PurposeSoil electro-kinetic remediation (EKR) has received significant attention owing to its environmental sustainability. Water electrolysis at electrode surface changes the pH profile of soil water. The pH profile has a strong impact on EKR performances. The aims of this study were to quantify the mass transfer of H+ and OH- and investigate the coupled relationship among H+ and OH- mass transfer, electric field and porous fluid flow.Materials and methodsHerein, multi-dimensional (1D and 2D) models capable of coupling fluid flow and mass transfer were established to study the coupled relationship among H+ and OH- mass transfer, electric field and porous fluid flow. The multi-dimensional (1D and 2D) models were validated by lab scale experiments.Results and discussionThe characteristics of pH front and pH profile was proven to be dominated by electric field, mass transfer and porous fluid flow. The movement of pH front and pH profiles dominates the EKR performance. The conductivity rise and the electric field distribution variations were quantified and proven to be caused by the H+ and OH- mass transfer. After a certain EKR time, in the areas near the electrodes where the H+ and OH- are generated, the mass transfer flux of H+ and OH- is gradually close to its releasing rate, the ionic species H+ and OH- stop accumulating and the concentration of both tends to steady state, so does the conductivity.ConclusionsWe demonstrated that the coupled relationship among mass transfer of H+ and OH-, electric field, and porous fluid flow dominates the movement of pH profiles and the conductivity rise.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据