Rhea Lee K, Clark Catherine
Groundwater Characterization and Remediation Division, US Environmental Protection Agency, Center for Environmental Solutions and Emergency Response, Subsurface Remediation Branch, Ada, Oklahoma, USA.
Remediation (N Y). 2022 Feb 7;32(1-2):97-118. doi: 10.1002/rem.21710.
Management of large, dilute groundwater plumes of comingled chlorinated volatile organic compounds (CVOCs) and 1,4-dioxane (dioxane) is problematic due to chemical, hydrogeologic and economic concerns. The US Environmental Protection Agency (US EPA) has conducted research on the management of CVOC plumes for many years, and more recently dioxane. US EPA research on monitored natural attenuation (MNA) of CVOC plumes was reviewed by a science advisory board in 2001. Specific additional research was recommended and has been addressed in a series of US EPA reports produced over almost two decades. These reports are summarized in this document along with supporting information including evidence of biological degradation of dioxane. Based on the summarized reports, US EPA work documented elsewhere, and the work of others, under appropriate conditions MNA or augmented MNA remain viable management options for these plumes. Unlike MNA of plumes containing only CVOCs, however, MNA of large dilute comingled plumes should be expected to occur by cometabolic oxidation rather than direct metabolic processes.
由于化学、水文地质和经济方面的问题，对混合存在的氯代挥发性有机化合物（CVOCs）和1,4 - 二恶烷（二恶烷）构成的大型、稀释地下水羽状物进行管理存在困难。美国环境保护局（US EPA）多年来一直在开展关于CVOC羽状物管理的研究，最近也涉及二恶烷。2001年，一个科学咨询委员会对US EPA关于CVOC羽状物的监测自然衰减（MNA）研究进行了审查。委员会提出了具体的额外研究建议，并且在近二十年产生的一系列US EPA报告中得到了落实。本文件总结了这些报告以及相关支持信息，包括二恶烷生物降解的证据。基于总结的报告、US EPA在其他地方记录的工作以及其他研究成果，在适当条件下，MNA或强化MNA仍然是这些羽状物可行的管理选择。然而，与仅含CVOCs的羽状物的MNA不同，大型稀释混合羽状物的MNA预计将通过共代谢氧化而非直接代谢过程发生。
