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Field Demonstration of the Horizontal Treatment Well (HRX Well®) for Passive In Situ Remediation
Groundwater Monitoring & Remediation ( IF 1.9 ) Pub Date : 2020-07-26 , DOI: 10.1111/gwmr.12407
Craig E. Divine , Jesse Wright , Michelle Crimi , J.F. Devlin , Michael Lubrecht , Jack Wang , Jeff McDonough , Michael Kladias , Jesse Hinkle , Allison Cormican , Trevor Osorno , Blossom N. Nzeribe , Fiona Laramay , Daniel Ombalski , Kathleen Gerber , Hunter Anderson

The horizontal reactive media treatment well (HRX Well®) uses directionally drilled horizontal wells filled with a treatment media to induce flow‐focusing behavior created by the well‐to‐aquifer permeability contrast to passively capture proportionally large volumes of groundwater. Groundwater is treated in situ as it flows through the HRX Well and downgradient portions of the aquifer are cleaned via elution as these zones are flushed with clean water discharging from the HRX Well. The HRX Well concept is particularly well suited for sites where long‐term mass discharge control is a primary performance objective. This concept is appropriate for recalcitrant and difficult‐to‐treat constituents, including chlorinated solvents, per‐ and polyfluoroalkyl substances (PFAS), 1,4‐dioxane, and metals. A full‐scale HRX Well was installed and operated to treat trichloroethene (TCE) with zero valent iron (ZVI). The model‐predicted enhanced flow through the HRX Well (compared to the flow in and equivalent cross‐sectional area orthogonal to flow in the natural formation before HRX Well installation) and treatment zone width was consistent with flows and widths estimated independently by point velocity probe (PVP) testing, HRX Well tracer testing, and observed treatment in downgradient monitoring wells. The actual average capture zone width was estimated to be between 45 and 69 feet. Total TCE mass discharge reduction was maintained through the duration of the performance monitoring period and exceeded 99.99% (%). Decreases in TCE concentrations were observed at all four downgradient monitoring wells within the treatment zone (ranging from 50 to 74% at day 436), and the first arrival of treated water was consistent with model predictions. The field demonstration confirmed the HRX Well technology is best suited for long‐term mass discharge control, can be installed under active infrastructure, requires limited ongoing operation and maintenance, and has low life cycle energy and water requirements.

中文翻译:

用于被动原位修复的水平处理井(HRXWell®)的现场演示

水平反应介质处理井(HRXWell®)使用定向井水平井,其中注满了处理介质,以诱导井至含水层渗透率对比所产生的流动集中行为,从而被动地按比例捕获大量地下水。地下水在流过HRX井时就地处理,并通过洗脱对含水层的下降梯度部分进行清洗,因为这些区域被从HRX井中排出的净水冲刷了。HRX井概念特别适用于以长期质量排放控制为主要性能目标的现场。此概念适用于顽固难处理的成分,包括氯化溶剂,全氟烷基物质和多氟烷基物质(PFAS),1,4-二恶烷和金属。安装并运行了全尺寸HRX井,以用零价铁(ZVI)处理三氯乙烯(TCE)。模型预测的通过HRX井的增强流量(与在安装HRX井之前流入自然地层的流量和与自然地层正交的等效横截面)和处理区宽度与流量和点速度探头独立估算的宽度一致(PVP)测试,HRX井示踪剂测试以及降级监控井中的观察处理。实际平均捕获区宽度估计在45到69英尺之间。在性能监控期间,TCE的总质量排放减少量一直保持不变,并超过99.99%(%)。在处理区内的所有四个降梯度监测井中观察到三氯乙烯浓度降低(在第436天从50%降至74%),并且处理后水的首次到达与模型预测一致。现场演示证实,HRX井技术最适合于长期的大流量排放控制,可以安装在活跃的基础设施下,需要有限的持续运行和维护,并且生命周期的能源和水需求低。
更新日期:2020-08-20
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