PERSISTANCE OF NAPL CONTAMINANTS IN NATURAL SUBSURFACE SYSTEMS

非水相有机液体是水的广泛污染物， 地下土壤和地下水。 从人类健康的角度来看， 有机液体特别令人关注，因为它们往往代表 长期的污染源，并创造多样化和持久的途径 最终暴露在人体内 本项目提出的工作是 旨在研究影响环境的过程， 包封、持久性、转运、生物利用度和毒性 天然地下环境中的有机液体成分。 它 代表了一个基础研究计划，建立在以前的基础上， 目前NIEHS资助的项目，并整合了实验室和数学 建模调查。 子项目A侧重于 苯、甲苯、二甲苯（BTX）和氯化溶剂化合物。 其 具体目标涉及调查的影响， 和化学不均匀性对有机液体截留和质量 转移，以及多重影响的量化，耦合 污染物的归宿和迁移过程。 将特别注意 旨在通过封闭的微生物过程的阐明， 与项目1调查人员合作。 因此，建议的工作是 旨在逻辑上扩展在以前的NIEHS中获得的知识- 资助的项目，以考虑多个进程的相互作用， 化学和物理不均匀性对这些过程的影响， 以及复杂NAPL混合物的行为和命运。 虽然导演 主要是研究自然发生的衰减 从这些研究中获得的知识将立即 应用于设计更有效的补救策略。

Nonaqueous phase organic liquids are widespread contaminants of subsurface soils and groundwater. From a human health perspective, these organic liquids are of particular concern because they tend to represent long-term sources of pollution and create diverse and persistent pathways for eventual human exposure. The work proposed in this project is directed towards the investigation of processes which influence the entrapment, persistence, transport, bioavailability, and toxicity of organic liquid components in the natural subsurface environment. It represents a fundamental research program which builds upon previous and current NIEHS-funded projects and integrates laboratory and mathematical modeling investigations. Subproject A focuses on the behavior of benzene, toluene, xylene (BTX) and chlorinated solvent compounds. Its specific aims relate to the investigation of the influence of physical and chemical heterogeneities on organic liquid entrapment and mass transfer, and the quantification of the influence of multiple, coupled processes on contaminant fate and transport. Special attention will be directed to the elucidation of microbial processes through close collaboration with Project 1 investigators. Thus, the work proposed is designed to logically extend the knowledge gained in previous NIEHS- funded projects to consider the interaction of multiple processes, the influence of chemical and physical heterogeneities on these processes, and the behavior and fate of complex NAPL mixtures. Although directed primarily at the investigation of naturally occurring attenuation processes, the knowledge gained from these studies will have immediate applications to the design of more effective remediation strategies.