项目名称： 电动修复中电迁移和电渗流交互作用对阴离子迁移的影响机制及其调控

项目编号： No.41471261

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 地质学

项目作者： 仓龙

作者单位： 中国科学院南京土壤研究所

项目金额： 80万元

中文摘要： 在污染土壤电动修复中，阴离子的电迁移和电渗流的迁移方向不一致，其交互作用直接影响了阴离子在电场作用下的迁移和污染物的去除效率。然而国内外相关的研究报道非常有限，且传统的电动修复理论无法科学阐明和描述阴离子在电场中的迁移行为。本项目拟在多年来开展污染土壤电动修复研究的基础上，选择典型阴离子为研究对象，以石英砂、高岭土和模拟土壤等为介质，研究不同控制措施对电迁移和电渗流的影响，计算和测定电迁移系数和电渗系数以及典型阴离子在土柱中的迁移速率，阐明典型阴离子在电迁移和电渗流交互作用下的迁移规律和影响机制。同时以PAHs污染土壤为例，研究电迁移和电渗流交互作用对阴离子氧化剂的迁移和对PAHs的降解机制。通过上述研究，旨在揭示电迁移和电渗流交互作用对阴离子迁移的影响机制，获得阴离子电动迁移的优化经验方程，完善电动修复的基础理论，为电动修复中物质迁移规律提供基础性研究资料，具有重要的理论价值和应用前景。

中文关键词： 电动修复；阴离子；电迁移；电渗流；迁移机制

英文摘要： In the process of electrokinetic (EK) remediation of contaminated soil, the anions migration direction of electromigration and electroosmotic flow is inconsistent, which directly affects the migration of anion and the removal of the contaminants under the direct current electric field. However, the relevant domestic and foreign research reports are very limited, and the conventional EK theory could not describe and clarify the migration behavior of anions during EK process. On the basis of our research of EK remediation over the years, this project intends to investigate the effect of different control measures on the electromigration and electroosmotic flow by selecting some typical anions as the research object and quartz sand, kaolin and simulated soil as the medium. By computing and determining the electromigration and electroosmosis coefficient and the migration rate of anion in different mediums during EK process, to illuminate the migration pattern and influence mechanism of typical anionic under the interactions of electromigration and electroosmotic flow. Take PAHs contaminated soil for example, the effect of the interaction of electromigration and electroosmotic flow on the migration of anion oxidants and the degradation mechanism of PAHs are evaluated. Through these studies, to reveal the effect mechanism of anion migration under the interaction between electromigration and electroosmotic flow migration, obtain the optimized empirical equation discribing the anions migration, improve the basic theory of EK remediation, and provide basic data for the study of the migration of substances, which has important theoretical value and application prospects.

英文关键词： electrokinetic remediation;anions;electromigration;electroosmotic flow;migration mechanism