Adventus Americas Inc.

Reductive Dechlorination of Solvents in Groundwater Using Controlled-Release Carbon with Microscale ZVI

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Courtesy of Adventus Americas Inc.

Untitled Document ABSTRACT: Groundwater beneath an active grain storage facility in south central Kansas is impacted by carbon tetrachloride (CT) which was used as a silo fumigant. Chloroform (CF) - a recognized anaerobic biodegradation product of CT - is also present. There is limited evidence for the presence of other CT catabolites such as dichloromethane (DCM) or chloromethane (CM). Significant soil impacts were not observed for any constituent. Remedial engineering and design efforts considered the use of zero-valent iron (ZVI) or EHCTM to support in situ source management (ISSM) and enhanced passive remediation (EPR) for treatment of the groundwater plume. Laboratory treatability studies suggested that ZVI alone was equally effective as EHCTM and offered some potential cost savings depending on the construction design; however, EHCTM appeared to provide more complete degradation of CT within the defined treatment area, potentially avoiding a situation where CT catabolites such as DCM remain as groundwater constituents of interest. Two conceptualized groundwater remedies (i.e., PRB and source area treatment) using ZVI or EHCTM were subsequently compared for full-scale field demonstration of their ability to effectively manage a plume of CT and related compounds.

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