| 土壤电动修复的电极空间构型优化研究 |
| 摘要点击 1682 全文点击 1182 投稿时间：2014-06-24 修订日期：2014-09-12 |
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| 中文关键词 重金属 污染土壤 电动修复 电极构型 优化 |
| 英文关键词 heavy metals contaminated soil electrokinetic remediation electrode configuration optimization |
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| 中文摘要 |
| 采用MATLAB软件对非均匀电场中几种常见电极构型的电场分布进行了模拟,根据最优的电极构型构建了电动修复实验装置,研究了电动修复过程中不同部位土壤pH以及重金属残留量随时间变化情况. 结果表明,从电场强度的有效性角度,正方形(1-D-1)和正六边形(2-D-3)分别是一维、二维构型中最优的电极构型,土壤pH值的变化、重金属的去除与电场强度的分布有密切关系. 采用正六边形电极构型对镉、镍、铅、铜共4种阳离子型重金属进行电动修复时,控制阴极pH值,随着修复的进行,在整个反应单元中逐步形成了酸性迁移带,可在一定程度上避免重金属的过早沉淀,有利于重金属的去除. 电动修复480 h后,重金属镉、镍、铅、铜的总去除率分别为86.6%、86.2%、67.7%、73.0%,可根据修复目标改变修复时间和更换电极频次. |
| 英文摘要 |
| Electric field distributions of several different electrode configurations in non-uniform electric field were simulated using MATLAB software, and the electrokinetic remediation device was constructed according to the best electrode configuration. The changes of soil pH and heavy metal residues in different parts of the device during the electrokinetic remediation were also studied. The results showed that, in terms of the effectiveness of the electric field strength, the square (1-D-1) and hexagonal (2-D-3) were the optimal electrode configurations for one-dimensional and two-dimensional respectively and the changes of soil pH, the removal of heavy metals and the distribution of electric field were closely related to one another. An acidic migration band, which could prevent premature precipitation of heavy metals to a certain extent and promote electrokinetic removal of heavy metals, was formed gradually along with the remediation in the whole hexagon device when the cathodic pH was controlled during the remediation of the four cationic metallic ions, Cd2+, Ni2+, Pb2+ and Cu2+. After 480-hour remediation, the total removals of Cd, Ni, Pb and Cu were 86.6%, 86.2%, 67.7% and 73.0%, respectively. Remediation duration and replacement frequency of the electrodes could be adjusted according to the repair target. |
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