Ozone Sparging Closure of an Industrial VOC Spill Site Adjacent to a Water Supply Well Site

摘要

Ozone sparging using the KTI C-Sparge process was performed on an industrial site adjacent to a major water supply well site. Ozone sparging was initiated in February, 2000, and groundwater volatile organic compound concentrations in downgradient wells decreased as much as 95 percent by the end of 2001. From 2003 to closure in 2006, the responsible party continued treatment with monitored attenuation and combined source treatment with a barrier region rather than more aggressively attack plant source areas. Initial remedial actions included source excavation (1996), a Fenton's Reagent flood (1998), followed by ozone sparging. The regulatory agency accepted ozone sparging for source treatment and temporary barrier as the most desirable alternative. Monitored attenuation was not acceptable without source reduction and elimination. Continued operation of the facility progressed during remedial treatment. Closure was obtained with the region achieving MCLs (Minimum Contaminant Levels) at the operational water supply wells and on the industrial site boundary. Final groundwater removal was in excess of 99%. No adverse water quality impacts were found during treatment at the water supply wellheads.