Project 6: Mobilization of Anthropogenic As in Groundwater

项目 6：地下水中人为砷的动员

• 批准号: 7089760
• 负责人: Steven N. Chillrud
• 金额: $ 17.99万
• 依托单位: COLUMBIA UNIVERSITY HEALTH SCIENCES
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-04-01 至 2011-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7089760
• 关键词: United States; arsenic; environmental contamination; environmental therapy; environmental toxicology; environmental transport; field study; hazardous substances; hypoxia; iron; oxidation reduction reaction; soil sampling; waste disposal; water flow; water pollution; water sampling /testing

This project proposes a set of lab and field experiments to further the fundamental understanding of biogeochemical processes governing the behavior and transport of inorganic and organic Arsenic (As) species as well as contribute to the design and management of remediation activities of sites contaminated with As. We have chosen the Vineland Chemical site in southern New Jersey as our primary field site because it offers a number of research opportunities. One primary focus will be on experiments that could help optimize pump and treat operations. These studies would include plume capture efficiency assessments through measurements of tracers of groundwater flow velocities and directions. They would also involve laboratory and field experiments to investigate whether manipulations of aquifer chemistry could enhance remediation of groundwater As, primarily through accelerating As mobilization from aquifer solids, thereby enabling pump and treat operations to decrease subsurface As inventories more rapidly. We will also collaborate with Project 7 on investigating the feasibility of using permeable reactive barriers of zero valent iron as an additional remediation strategy to the current pump and treat system. Other field experiments will investigate fundamental transport and fate issues of As in two offsite areas highly contaminated with As, specifically the Blackwater Branch and Union Lake. We will further investigate As cycling in bottom sediments of both the stream (which runs adjacent to the Superfund site) and of Union Lake. Our prior work has shown that the sediments of these two surface water bodies have dramatically different As chemistries, with fine-grained sediments of the stream having As controlled largely by sulfur chemistry while As in the lake sediments appears to be primarily controlled by iron chemistry. Additional sediment-porewater research will be done in the Blackwater Branch to investigate whether As behavior changes as a function of streamflow/groundwater discharge rates and to investigate As porewater-sediment interactions in sandy sediments which represent >80% of the stream bottom. The role of storm events in transporting As in the Blackwater Branch will also be investigated. Finally, research in Union Lake will investigate the magnitude of As release from sediments during episodes of anoxia in bottom waters.

该项目提出了一套实验室和现场实验，以进一步了解基本的 无机和有机砷（As）行为和迁移的地球化学过程 物种，并有助于设计和管理受污染场地的补救活动 与As。我们选择位于新泽西南部的Vineland Chemical工厂作为我们的主要现场 因为它提供了大量的研究机会。一个主要的重点将是实验， 有助于优化泵送和处理操作。这些研究将包括烟羽捕获效率评估 通过测量地下水流速度和方向的示踪物。他们还将涉及 实验室和实地实验，以调查含水层化学的操作是否可以提高 修复地下水As，主要是通过加速As从含水层固体中的迁移， 使得泵和处理操作能够更快地减少地下As存量。我们还将 与项目7合作，研究使用零价可渗透反应屏障的可行性 铁作为当前泵送和处理系统的附加补救策略。 其他的野外实验将调查As在两个非现场区域的基本运输和归宿问题 特别是黑水分支和联合湖我们将进一步调查 随着溪流（邻近超级基金场地）和联合河底部沉积物的循环 湖我们先前的工作表明，这两个地表水体的沉积物 不同的砷化学成分，河流的细粒沉积物中的砷主要受硫的控制 而湖泊沉积物中的As似乎主要由铁化学控制。额外 将在黑水分支进行沉积物孔隙水研究，以调查As行为是否 变化作为径流/地下水排放率的函数，并调查As孔隙水-沉积物 桑迪沉积物中的相互作用，这些沉积物占河流底部的80%以上。风暴事件的作用 运输作为在黑水分支也将进行调查。最后，联合湖的研究将 研究了底层沃茨缺氧期间沉积物中As释放的幅度。