PulseOx 100, an aggressive in-situ chemical oxidation system developed by Applied Process Technology, Inc. (Applied), was utilized at an active gas station to remediate gasoline and fuel oxygenates. The portable PulseOx 100 cabinet unit, which can treat up to eight injection wells, pulsed four reagents – ozone, hydrogen peroxide, oxygen, and air – into two oxidant injection wells located in the “hot spot” of the contaminant plume. Approximately 0.125 lbs/day of ozone were injected into each well, and compressed air was used to drive the oxidant into the saturated soil.

Prior to treatment, TPHg, BTEX, MtBE and TBA were detected at concentrations as high as 32,000 ppb, 8,502 ppb, 220,000 ppb, and 200,000 ppb, respectively. After the first phase of treatment, which lasted 22 days, groundwater samples showed a 99% decrease in TPHg, >99% reduction in BTEX, 81% destruction of MtBE, and 78% destruction of TBA. The in-situ injection of reagents resulted in increased dissolved oxygen levels in the groundwater that significantly enhanced natural biodegradation. This was observed for several months after the first phase of treatment was completed. A second phase of treatment was then initiated and lasted about a month. During this phase of treatment, TPHg and BTEX concentrations were reduced to non-detect levels, and MtBE/TBA removal exceeded 99%.

Removal of the source of groundwater contamination at this site prevented further offsite migration of the contaminant plume. This PulseOx 100 project clearly demonstrates the speedy and effective remediation of a highly contaminated site at costs that are significantly less than standard pump-and-treat technologies.

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