Multicomponent PCB transport in groundwater systems

地下水系统中的多组分 PCB 传输

• 批准号: 105373-2007
• 负责人: Kueper, Bernard
• 金额: $ 2.48万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=451250
• 关键词: Multicomponent; PCB; transport; groundwater; systems

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.

准确评估和经济有效地修复受污染的地下水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主要饮用水源。该提案针对国家优先领域——环境和可持续发展——重点是可再生资源管理。所处理的地下水污染物的具体类别是多氯联苯 (PCB)，这是一组 209 种独立的有机同系物。尽管多氯联苯已不再生产，但由于其高抗降解性，它们在加拿大的整个环境中持久存在。环境中的大部分 PCB 物质以致密非水相液体 (DNAPL) 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研究松散覆盖层沉积物和裂隙基岩中的 PCB 迁移。这项工作将以前所未有的细节进行，通过检查地下水中各个同系物的乳液传输和迁移来解决该问题，而不是解决水相中总 PCB 的传统方法。由此产生的知识和将要开发的 3D 数值模型可以被加拿大环境行业用来进一步评估、选择和设计受 PCB 影响的场地的补救技术。 这些知识还可用于进行风险评估并评估地下水中的多氯联苯对更广泛的水文循环的贡献。预计这项工作成果将在3年内对加拿大环保产业产生积极影响。 从长远来看，这项研究的结果将使从业人员能够诊断受多种多组分化合物（而不仅仅是多氯联苯）影响的部位。研究将由研究生小组进行，该小组拥有 16 年地下水系统有机化合物数值模拟和实验室实验经验。