Project 3: Enhanced Remediation at Arsenic-Contaminated Sites in the US

项目3 -摘要： 地下水砷污染既普遍又难以补救。我们之前的研究 表明，在原位磁铁矿形成扩散屏障能够长期保留。的 该项目的总体目标是开发一种强化的修复技术， 原位形成反应屏障，在实验室和现场维持低砷浓度 审判我们的目标包括一系列基于实验室和现场的实验，以（1）优化和（2） 在实地实施基于磁铁矿的补救办法。实验室目标旨在 提高对基本过程的理解，以最大限度地发挥磁铁矿的潜力- 采取补救措施。这些信息可用于开发模型， 矿物学和解决方案组成的变化，有效地预测作为命运和运输。然后我们将使用 这些模型用于在美国地质勘探局位于科德角和86号地块的研究基地设计试点修复工作 北卡罗来纳州州立大学的超级基金网站。基于实地调查，在这两个异质 受污染场地将描述背景条件和磁铁矿形成机制， 扩大实验室数据，完善反应性迁移模型，并开发“补救工具箱”， 针对具体地点的强有力的补救战略设计。

Project 3 - SUMMARY: Groundwater arsenic contamination is both pervasive and difficult to remediate. Our previous research indicates that in situ magnetite formation forms a diffuse barrier capable of long-term As retention. The overarching goals of this project are to develop an enhanced remediation technology that produces magnetite in situ to form a reactive barrier that sustains low arsenic concentrations both in the laboratory and in field trials. Our aims include a series of laboratory-based and field-based experiments to (1) optimize and (2) implement magnetite-based remediation approaches in the field. The laboratory-based aims are designed to develop an improved understanding of the fundamental processes to maximize the potential of magnetite- based approaches to remediation. This information can be used to develop models that account for mineralogical and solution composition changes that effectively predict As fate and transport. We will then use these models to design pilot remediation efforts at the USGS research site on Cape Cod and the Lot 86 Superfund site on the NC State University. Field-based investigations at these two heterogeneous contaminated sites will characterize both background conditions and magnetite formation mechanisms to upscale laboratory data, refine reactive transport models, and develop a “remediation toolbox” to facilitate robust designs of site-specific remediation strategies.