Mechanism-Based Analysis for Electrokinetically-Enhanced Aggregate Remediation

摘要9901108 PI：Aaron A.Jennings研究所：Case Western Reserve University“电动增强骨料修复的基于机理的分析”虽然电动方法在岩土工程应用中已经使用了很多年，但它们在修复中的应用相对较新。电动力学可用于诱导流体流动、诱导无流体流动的离子迁移或诱导粒子迁移。至少在两种情况下，电动补救可以提供比替代策略更好的优势。由于这些土壤对固相传质具有非同寻常的抵抗力，电迁移率可能会加强对“老污染”土壤(被污染了几十年的土壤)的修复。电渗法在修复低渗透性土壤方面可能具有优势，因为现场水文条件阻止了水力诱导水流。这项研究项目将研究电动修复过程中发生的个别过程。实验研究将重点放在这种电化学现象的分离上，并将量化电动增强修复“旧污染”土壤的个别机制。将利用数学建模结果和实验分析来开发技术，以测量实际补救设计所需的参数。筛选方法将被设计出来，以帮助工程师和科学家识别这种修复过程最有效的土壤。结果将被合并到一个设计工具中，帮助工程师分析应用电动过程来加强补救的潜在好处。这项研究将有助于对电动增强修复的基本理解，并将这一知识应用于实际的修复设计。开发的方法和程序将使工程师能够确定电动现象何时提供比补救替代方案更具竞争力的优势。

Abstract 9901108 PI: Aaron A. Jennings Institution: Case Western Reserve University "Mechanism-Based Analysis for Electrokinetically-Enhanced Aggregate Remediation" Although electrokinetic processes have been used in Geotechnical applications for many years, their use in remediation is relatively new. Electrokinetics can be used to induce fluid flow, induce ion migration without fluid flow, or induce particle migration. There are at least two situations where electrokinetic remediation can offer advantages over alternative strategies. Electromobility may enhance the remediation of "old contamination" soils (soils that have been contaminated for decades) because these soils offer unusual resistance to mass transfer from the solid phase. Electro-osmosis may have advantages in remediating low permeability soil where site hydrology precludes inducing flow hydraulically. This research project will study the individual processes that occur during electrokinetic remediation. Experimental research will focus on this separation of electrochemical phenomena, and will quantify the individual mechanisms responsible for electrokinetically-enhanced remediation of "old contamination" soils. Mathematical modeling results and experimental analyses will be used to develop techniques to measure the parameters required for practical remediation design. Screening methods will be devised to help engineers and scientists identify soils for which this remediation process would be most effective. Results will be combined into a design tool that will help engineers analyze the potential benefits of applying electrokinetic processes to enhance remediation. The research will make contributions to both the fundamental understanding of electrokinetically-enhanced remediation, and the application of this knowledge to practical remediation design. The methods and procedures developed will allow engineers to determine when electrokinetic phenomena offer competitive advantages over remediation alternatives.