Ensuring the continued success of a mulch biowall at a trichloroethylene‐contaminated superfund site: Lessons learned

Shahrzad Saffari Ghandehari, Shih‐Huai Cheng, C. Hapeman, A. Torrents, B. V. Kjellerup
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Abstract

Trichloroethylene (TCE) is a toxic organic compound, which can adversely affect human health. The chemical is one of the most frequently found contaminants in groundwater in the United States and around the world. A landfill in Maryland contaminated with high levels of TCE decades ago was added to the National Priority List (NPL) in 1994 for clean up. A biowall was installed on the site in 2013 to promote the bioremediation of TCE and subsequently of its degradation products. Six‐year monitoring data indicated a steady removal of >99% groundwater TCE at the wall since installation. However, a concurrent buildup of intermediate byproducts was observed downgradient of the wall. An examination of the entire system was necessary to find the reason behind the inefficiency of the biowall. In this study, the background of the site, remediation plan, and installation were assessed. Monitoring data, including the concentration of TCE and its degradation byproducts, and geochemical and physical characteristics were evaluated to understand the conditions and challenges facing decision‐makers of this project and possible options to improve biowall efficacy.
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确保覆盖生物墙在三氯乙烯污染的超级基金场地的持续成功:经验教训
三氯乙烯(TCE)是一种有毒的有机化合物,会对人体健康产生不利影响。这种化学物质是美国和世界各地地下水中最常见的污染物之一。几十年前,马里兰州的一个垃圾填埋场被高浓度的TCE污染,1994年被列入国家优先清理名单(NPL)。2013年在现场安装了一个生物墙,以促进TCE及其降解产物的生物修复。6年的监测数据表明,自安装以来,墙内地下水TCE的稳定去除量达到了50% ~ 99%。然而,在壁的下梯度处观察到中间副产物的同时积聚。有必要对整个系统进行检查,以找出生物墙效率低下背后的原因。本研究对选址背景、修复方案和安装进行了评估。通过评估监测数据,包括TCE及其降解副产物的浓度、地球化学和物理特征,了解该项目的决策者面临的条件和挑战,以及提高生物墙效能的可能选择。
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来源期刊
CiteScore
3.50
自引率
21.10%
发文量
37
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