UST Sites in South Dakota and Colorado 

Benzene was the primary groundwater contaminant concern at existing gas stations in Denver, CO. The E-Redox™ (O) technology was tested using spiked samples from the site and compared to other electron accepting conditions. The highest benzene biodegradation rate of 585 μg/L/day was observed for E-Redox™ (O). Two wells near one gas station were selected for installation of E-Redox™ (O) units, and each well had adjacent monitoring wells within 9 to 11 ft. After approximately three months, the benzene concentrations decreased by over 90% to below the groundwater standard.

An E-Redox™ (O) unit was installed at a former gas station in rural area in South Dakota, where leaking underground storage tank impacted the groundwater with petroleum hydrocarbons (free product was present at approximately 3 ft thick in two monitoring wells). After less than one year since the installation of the E-Redox™ unit, over 60% of the GRO-TPH was degraded, while over 90% of the benzene was degraded). Voltage production was observed indicating biodegradation.

Petroleum-Contaminated Sediments (Lab Study)

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