Superfund Innovative Technology Evaluation (SITE)
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
|IN-SITU Thermal Oxidative
Process HRUBETZ Environmental Services
The HRUBOUT process is a thermal, treatment process designed to remove VOCs and semi-VOCs from contaminated soils. Heated air is injected into the soil below the contamination zone, evaporating soil moisture and removing volatile and semivolatile hydrocarbons. As the water evaporates, soil porosity and permeability increase, further facilitating the air flow at higher temperatures. As the soils temperature increases further, the less volatile constituents volatilize or are thermally oxidized. An in situ project was completed in Ottawa, Ontario at the Canadian Forces military base. Levels up to 1,900 ppm of total petroleum hydrocarbons (TPH) were found in a 17-by-17-foot area on the base. After 12 days of treatment, borehole samples ranged from nondetect to 215 ppm TPH, meeting closure requirements of 450 ppm. The ex situ version of the technology was used to remediate a Toronto, Ontario site with 1,500 yd3 of gasoline and diesel contaminated soil. Soil contamination was measured at 200 ppm TPH. After treatment, 2 samples had detectable TPH concentrations (25 and 37 ppm), the remaining 5 samples had nondetectable levels, thereby achieving the 100 ppm TPH cleanup goal.