Successful Application of HRC in a Fractured Formation in Tennessee (PDF)

Under Tennessee’s Voluntary Cleanup program, a pilot program was successfully implemented using hydrogen-release compound (HRC, Regenesis, Inc.) to address perchloroethene (PCE) and trichloroethene (TCE) contamination in groundwater. Flow direction was known generally, however the fractured nature of the formation precluded specific knowledge of consistent flow across the site. The HRC injection system was specifically designed to intensify activity and affect the fractures as groundwater migrates downgradient.
Two areas of the plume were treated. One area had PCE and TCE concentrations exceeding 100 mg/L , the second with lower concentrations (near 10 mg/L). Prior to initiation of the pilot test, conditions were clearly oxidative, with elevated dissolved oxygen concentrations and positive oxidation-reduction potential (ORP) readings. The pilot test operated for 9 months, with samples collected from wells on a monthly basis.  Monitoring data showed a steady and consistent record of declining dissolved oxygen, ORP, PCE and TCE across most areas of the site. While attaining cleanup objectives was not a goal in this pilot study, TCE and PCE were brought to below detection limits in some areas. Fluctuations in contamination were observed with changes in groundwater elevation, but HRC was still effective. Pilot data were used to design the full-scale treatment system now underway.

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