MODELING VOLATILIZATION AND VAPOR TRANSPORT OF CONTAMINANTS IN THE SUBSURFACE

模拟地下污染物的挥发和蒸气传输

• 批准号: 3876770
• 负责人: LINDA M ABRIOLA
• 金额: --
• 依托单位: MICHIGAN STATE UNIVERSITY
• 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/3876770
• 关键词: computer simulation; environmental contamination; environmental engineering; fluidity; mathematical model; nonwater solvent; organic chemicals; soil pollution; vapor

Volatile organic chemicals are commonly released to the environment as nonaqueous phase liquids (NALS) via surface spillage, storage tank leakage, or leaching from hazardous waste landfills. The presence and behavior of NAPL in subsurface systems has not been adequately accounted for in prior aquifer modeling efforts. The is one of two companion projects to be conducted at the University of Michigan to address that deficiency. This project will focus on the development and partial verification of a computer model capable of quantifying the subsurface movement of NAPL itself, as a separate phase, as well as the movement of gas phases which result from volatilization of NAPL. Both non-aqueous bulk transport and vapor phase transport by convection and diffusion will be modeled. The model will be developed for computational efficiency and flexibility. Extensions of the model to two-dimensional domains and multi-component organic mixtures are also included in this research plan. To verify the physical assumptions inherent in the modeling approach, the behavior of two representative volatile organic compounds will be explored. Constitutive parameters for these two compounds will be measured and column experiments will be conducted for comparison with one-dimensional model simulations. In the later stages of the research, two-dimensional laboratory studies will be conducted to verify the two- dimensional model and explore the use of active and passive gas sampling techniques. The validity of the model assumptions concerning interphase mass exchange will be explored in the companion research project, and the results from that companion project will be incorporated into the overall computer simulator developed in this project.

挥发性有机化学物质通常以以下形式释放到环境中： 通过表面溢出、储罐的非水相液体 (NALS) 危险废物填埋场的泄漏或浸出。存在和 NAPL 在地下系统中的行为尚未得到充分考虑 用于之前的含水层建模工作。这是两个同伴之一 密歇根大学将开展项目来解决这个问题 不足。该项目将重点开发和部分 验证能够量化地下的计算机模型 NAPL 本身的运动（作为一个单独的阶段）以及 NAPL 挥发产生的气相。两者均非水性 通过对流和扩散进行的散装运输和气相运输将 被建模。该模型的开发将提高计算效率和 灵活性。将模型扩展到二维域 多组分有机混合物也包括在该研究计划中。 为了验证建模方法中固有的物理假设， 两种代表性挥发性有机化合物的行为将是 探索过。这两种化合物的本构参数为 将进行测量和柱实验以与 一维模型模拟。在研究的后期阶段， 将进行二维实验室研究以验证二维 维度模型并探索主动和被动气体采样的使用 技术。有关界面的模型假设的有效性 配套研究项目将探讨大众交换，并且 该配套项目的结果将纳入整体 本项目中开发的计算机模拟器。