Multicomponent PCB transport in groundwater systems

对受污染的地下水进行准确评估和具有成本效益的补救对于确保加拿大供水的可持续发展至关重要。加拿大约有800万人依靠地下水作为其主要饮用水来源。这项建议的目标是国家的一个优先领域- -环境和可持续发展- -强调可再生资源的管理。地下水污染物的具体类别是多氯联苯（PCBs），这是一组由209种不同的有机同系物组成的污染物。尽管多氯联苯已不再生产，但由于其高度抗降解性，它们在加拿大的环境中持续存在。环境中的大部分PCB质量以致密的非水相液体（DNAPLs）的形式存在于地下。拟议的研究将利用数值模拟和实验室实验来研究多氯联苯在松散覆盖层矿床和破碎基岩中的运移。这项工作将以前所未有的细节进行，因为该问题将通过检查地下水中单个同系物的乳化液运输和迁移来解决，而不是传统的解决水相中总多氯联苯的方法。由此产生的知识和将开发的3D数值模型可用于加拿大环境行业进一步评估，选择和设计pcb影响场地的补救技术。这些知识还可用于进行风险评估，并评估地下水中多氯联苯对更广泛的水文循环的影响。预计这项工作将有积极的影响的结果在3年内在加拿大环境产业。从长远来看，这项研究的结果将允许从业者诊断受各种多组分化合物影响的部位，而不仅仅是多氯联苯。研究将由研究生组成的小组进行，该小组对地下水系统中的有机化合物进行了16年的数值模拟和实验室实验。

Accurate assessment and cost-effective remediation of contaminated groundwater is essential to ensure the sustainable development of water supplies in Canada where approximately 8 million people rely on groundwater as their primary source of drinking water. This proposal targets an area of national priority - environment and sustainable development - with an emphasis on renewable resources management. The specific class of groundwater contaminants addressed is polychlorinated biphenyls (PCBs), a group of 209 separate organic congeners. Despite the fact that PCBs are no longer manufactured, they are persistent and present throughout Canada's environment because of their high resistance to degradation. The majority of PCB mass in the environment resides in the subsurface in the form of dense, non-aqueous phase liquids (DNAPLs). The proposed research will investigate PCB transport in both unconsolidated overburden deposits and fractured bedrock using both numerical simulation and laboratory experimentation. The work will be carried out in unprecedented detail in that the problem will be addressed by examining both emulsion transport and migration of individual congeners in groundwater, as opposed to the traditional approach of addressing total PCBs in the aqueous phase. The resulting knowledge and the 3D numerical models that will be developed can be used by the Canadian environmental industry to further assess, select, and design remedial techniques for PCB-impacted sites. The knowledge can also be used to perform risk assessments and to assess the contribution of PCBs in groundwater to the broader hydrologic cycle. It is expected that the results of this work will have a positive affect on Canada's environmental industry within 3 years. Long term, the results of this research will allow practitioners to diagnose sites impacted by a variety of multicomponent compounds, not just PCBs. Research will be carried out by graduate students in a group that has 16 years experience conducting numerical simulation and laboratory experimentation with organic compounds in groundwater systems.