Enhanced Remediation of Heterogeneous Subsurface Systems

该项目的总体目标是推进有效和高效的修复策略，地下系统污染的稠密非水相液体（DNAPLs），这是最常见和最具挑战性的超级基金污染物。具体目标涉及基本科学认识的演变和项目负责人的研究小组开发的一类有前途的浓盐水修复技术的应用。具体目标包括：（1）将这类技术扩展到新的水文和污染源条件，这些条件既常见又具有挑战性;（2）评估补救措施对暴露的影响;（3）制定、解决和使用这些系统的改进模型，以帮助我们提高对这些技术的理解和应用。在这项工作中将使用实验室和建模方法相结合。将进行广泛的实验，从批量实验，以确定详细的相行为和物理化学特性的实验，旨在模仿关注的自然系统的非均质三维流动池。数学建模对于推进和测试我们的基本理解、设计实验和解释结果、预测无法在实验室中直接评估的可能的现场条件的影响以及推进在实验室或现场评估的潜在更有效的策略至关重要。这项工作是有意义的，因为它涉及到一个主流问题的重要性，超级基金？修复受污染的地下系统，解决特别困难和普遍的污染物类别，考虑现实的系统，并将推进基本的理解。预计将产生直接影响超级基金地点的结果，包括在实地规模上使用 这个项目

The overall goal of this project is to advance effective and efficient remediation strategies for subsurface systems contaminated by dense non-aqueous phase liquids (DNAPLs), which are among the most common and most challenging of Superfund contaminants. The specific aims involve the evolution of fundamental scientific understanding and application of a promising class of dense-brine remediation technologies developed by the project leader's research group. The specific aims include the following: (1) to extend this class of technologies to new sets of hydrological and contaminant source conditions that are both common and challenging; (2) to evaluate the impact of remediation on exposure; and (3) to formulate, solve, and use improved models of these systems to help advance our understanding and application of these technologies. A combination of laboratory and modeling approaches will be used in this work. A wide range of experiments will be performed, from batch experiments to determine detailed phase behavior and physicochemical characteristics to experiments in heterogeneous three-dimensional flow cells intended to mimic the natural systems of concern. Mathematical modeling will be essential for advancing and testing our fundamental understanding, designing experiments and interpreting the results, predicting the effect of likely field conditions that cannot be evaluated directly in the laboratory, and advancing potentially more efficient strategies to be evaluated in the laboratory or field. This work is of significance because it deals with a mainstream issue of importance to Superfund?remediation of contaminated subsurface systems, addresses especially difficult and prevalent classes of contaminants, considers realistic systems, and will advance fundamental understanding. Outcomes that directly impact Superfund sites are expected, including field-scale use of the technologies developed in this project.