EFFECTS OF COSOLUTES ON HYDROPHOBIC-CONTAMINANT TRANSPORT

共溶质对疏水污染物迁移的影响

• 批准号: 3755174
• 负责人: ROGER C BALES
• 金额: --
• 依托单位: UNIVERSITY OF ARIZONA
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/3755174
• 关键词: adsorption; chlorobenzenes; chlorohydrocarbon; computer simulation; controlled environment chamber; diffusion; environmental contamination; environmental engineering; environmental toxicology; gas chromatography; ground water; halobiphenyl /halotriphenyl compound; high performance liquid chromatography; mathematical model; model design /development; soil pollution; solute; toxicant interaction; trichloroethylene; waste disposal; water environment; water flow; water pollution; water sampling /testing; water solution

Mixtures of organic contaminants found at Superfund sites generally enter groundwater through the vadose zone, a variably saturated zone lying between the land surface and the groundwater table. Chlorinated contaminants include alkyl halides such as trichloroethylene, volatile, aromatic compounds such as the chlorinated benzenes, and non-volatile compounds such as the chlorinated phenols. Understanding the transport and fate of these compounds in the vadose zone requires combining knowledge of sorption behavior, cosolute effects, and other chemical and microphysical factors with principles of water and solute movement in water-unsaturated media. The overall objective of the research is to test and validate our ability to predict the migration of chlorinated-organic contaminants dissolved in water in the vadose zone. Our approach will involve soil- column and intermediate-scale transport experiments using model compounds, and mathematical modeling of the experimental results. Laboratory batch and small-scale column experiments will be used to develop some chemical parameters, and to develop a better understanding of the dominant chemical and microphysical processes controlling sorption and transport. The mobile fluid in our experiments will be water, and concentrations of contaminants will be below solubility limits. Both volatile and non-volatile compounds will be used; for volatile compounds, gas-phase transport by diffusion will be addressed. The result of this research will provide sorely needed validation for tools used to describe contaminant transport in unsaturated media. We will use existing models, but will need to estimate the model parameters from our data. Our results will also provide better means for parameter estimation in both research and applications of vadose-zone transport modeling.

在超级基金场地发现的有机污染物混合物通常会进入 地下水通过包气带，这是一个可变饱和带 地表与地下水位之间。 氯化 污染物包括烷基卤化物，例如三氯乙烯、挥发性、 芳香族化合物，如氯化苯和非挥发性化合物 氯化酚等化合物。 了解交通和 这些化合物在渗流区的命运需要结合以下知识 吸附行为、共溶质效应以及其他化学和微物理 水不饱和状态下水和溶质运动原理的因素 媒体。 研究的总体目标是测试和验证我们的 预测氯化有机污染物迁移的能力 溶解在包气区的水中。 我们的方法将涉及土壤- 使用模型化合物进行柱和中等规模的传输实验， 以及实验结果的数学模型。 实验室批次 和小规模的柱实验将用于开发一些化学物质 参数，并更好地了解主要化学物质 和控制吸附和运输的微物理过程。 手机 我们实验中的流体将是水和污染物浓度 将低于溶解度极限。 挥发性和非挥发性化合物 将被使用；对于挥发性化合物，通过扩散的气相传输将 得到解决。 这项研究的结果将提供急需的 用于描述不饱和污染物传输的工具的验证 媒体。 我们将使用现有模型，但需要估计模型 来自我们数据的参数。 我们的成果也将为 渗流区研究和应用中的参数估计 运输建模。