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.

挥发性有机化学品通常释放到环境中 非水相液体(NALS)通过表面溢出、储罐 危险废物填埋场的渗漏或淋失。在场和 NAPL在地下系统中的行为尚未得到充分的解释 用于先前的含水层建模工作。这是两个同伴之一 密歇根大学将开展的项目以解决这一问题 缺乏症。本项目将重点开发和部分 能够量化地下表面的计算机模型的验证 NAPL本身作为一个单独阶段的运动，以及 NAPL挥发产生的气相。都是非水的 通过对流和扩散的散体输送和汽相输送将 当模特儿。该模型将为计算效率和 灵活性。将模型扩展到二维域和 多组分有机混合物也包括在这项研究计划中。 为了验证建模方法中固有的物理假设， 两种典型的挥发性有机化合物的行为将是 探索过了。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，以验证这两个- 主动式和被动式气体采样的量纲模型及应用探讨 技巧。相间模型假设的有效性 质量交换将在伙伴研究项目中进行探索，并 该配套项目的结果将被纳入总体 在本项目中开发的计算机模拟器。