Resurgence of Pump and Treat Solutions: Directed Groundwater Recirculation
Resurgence of Pump and Treat Solutions: Directed Groundwater Recirculation
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泵和处理解决方案的复兴：定向地下水再循环
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Michael LeFrancois
中科院分区：
文献类型：
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作者：
S. Suthersan;Eric Killenbeck;S. Potter;C. Divine;Michael LeFrancois
摘要与结论DGR是一种有效的技术，可以增强含水层的冲洗机制，以解决含水层在长达数十年的扩散羽流的传播和发展过程中所经历的不同水力条件所产生的复杂污染物分布。DGR的动态和自适应实现允许CSM和系统性能数据指导系统设计、实现和运行的过程。总而言之，有效设计和应用DGR的关键步骤和考虑因素包括：·在初始设计中使用定量模型，以最大限度地减少注水井和采油井之间的冲洗时间，并限制水力死区。测试交替流量，以了解与所选油井布局的流量变化相关的流场变化。·在系统安装和启动期间，进行水力测试，以确认当地的水力传导性、油井动态和污染物分布。·专注于系统评估和适应性优化，以实现目标流量、预期质量清除率，而不仅仅是“捕获区”。·强调最高渗透率区域内的提取井位置，该区域可以最有效地获取具有最高迁移潜力的污染物质量。在某些情况下，随着油井越来越多地从浓度较高的区域收集水，这些油井的污染物质量回收率可能会在短期内暂时增加。特别是，这种响应可以在破碎的岩石现场观察到。·通过跟踪特定油井和整个系统污染物质量清除率与总体积之比，持续评估系统性能
Summary and Conclusions DGR is an effective technology to enhance aquifer flushing mechanisms to address complex contaminant distri-bution resulting from varying hydrau-lic conditions an aquifer experiences during decades-long propagation and development of large diffused plumes. The dynamic and adaptive implementa-tion of DGR allows for the CSM and system performance data to guide the process of system design, implementa-tion, and operation. As a summary, key steps and considerations for effective design and application of DGR include:• Use a quantitative model for the initial design to minimize flushing times between injection and extrac-tion wells and limit hydraulic dead zones. Test alternate flow rates to understand flow field changes asso-ciated with changes in flow for the selected well layout.• During system installation and start up, conduct hydraulic testing to confirm local hydraulic conductiv-ity, well performance, and contami-nant distribution.• Focus on system evaluation and adaptive optimization to achieve target flow rates, expected mass removal rates, and not just on the “capture zones.”• Emphasize extraction well location within the highest permeability zones that can most effectively access contaminant mass with the highest migration potential. In some cases contaminant mass recovery rates at these wells can temporarily increase in the short term as the well increasingly captures water from higher concentration zones. In particular, this response may be observed in fractured rock sites.• Evaluate system performance con-tinuously by tracking well-specific and total system contaminant mass removal rates against total volume