Thermal remediation of multicomponent NAPL contamination in highly heterogeneous subsurface systems

高度异质地下系统中多组分 NAPL 污染的热修复

• 批准号: 105846-2007
• 负责人: Sleep, Brent
• 金额: $ 2.55万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=365864
• 关键词: Thermal; remediation; multicomponent; NAPL; contamination

Thermal remediation methods include hot water flushing, steam flushing (SF), electrical resistance heating (ERH), and thermal conductive heating (TCH). To date, there has been little research conducted on thermal remediation in highly heterogeneous subsurface systems (e.g. Smithville fractured rock site), either at the lab or field scale, or with numerical modelling. Prediction of rate limited mass transfer associated with the removal of multicomponent nonaqueous phase liquids (NAPL) by thermal remediation, particularly NAPL containing both high and low volatility organic compounds is also not currently well understood.The overall objective of the research is to determine the effectiveness of SF, ERH, and TCH for removal of multicomponent NAPL sources from heterogeneous soils, fractured clay, and fractured rock systems. In particular, the effectiveness of the three thermal remediation methods for removing specific components of the multicomponent NAPL source and the associated sorbed and aqueous phase organic compounds from the low permeability regions will be determined. Changes in soil properties during heating will be determined and related to removal rates. Mass transfer limitations with respect to removal of specific organic components from multicomponent NAPL by thermal remediation will be characterized. The potential for downward mobilization of dense NAPL with the three thermal remediation techniques for various hydrogeological settings will also be determined. The research will involve bench scale thermal remediation studies and computer modelling.This research will make significant contributions to the understanding of the impact of heat on mass transfer from multicomponent NAPL source zones in complex heterogeneous systems. This will allow more realistic evaluations of the effectiveness of the various thermal remediation methods for site remediation. As the uncertainty in these processes is currently a barrier to implementation of thermal remediation methods, it is expected that this will lead to more widespread application of thermal remediation methods, resulting in cleanup of more sites not amenable to remediation using other methods.

热修复方法包括热水冲洗、蒸汽冲洗（SF）、电阻加热（ERH）和导热加热（TCH）。迄今为止，在实验室或现场规模或数值模拟方面，对高度异质的地下系统（例如史密斯维尔断裂岩石场地）的热修复进行的研究很少。预测的速率限制的传质与去除多组分非水相液体（NAPL）的热修复，特别是NAPL含有高和低挥发性有机化合物也不是目前很好地understanded.The研究的总体目标是确定SF，ERH，和TCH去除多组分NAPL来源的非均质土壤，断裂的粘土和断裂的岩石系统的有效性。特别是，将确定三种热修复方法的有效性，用于从低渗透性区域去除多组分NAPL源的特定组分和相关的吸附和水相有机化合物。将确定加热过程中土壤性质的变化，并将其与去除率联系起来。传质限制相对于去除特定的有机成分从多组分NAPL热修复的特点。还将确定在各种水文地质条件下采用三种热补救技术向下动员致密非水杀伤人员地雷的潜力。这项研究将涉及实验室规模的热修复研究和计算机模拟。这项研究将对理解复杂非均相系统中多组分非水相污染物源区的热对传质的影响做出重大贡献。这将有助于更现实地评估各种热补救方法对现场补救的有效性。由于这些过程的不确定性目前是实施热补救方法的障碍，预计这将导致热补救方法的更广泛应用，从而清理更多不适合使用其他方法进行补救的场地。