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EPA 540/MR-93/524
IN-SITU Thermal Oxidative Process
HRUBETZ Environmental Services
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IN-SITU Thermal Oxidative Process
HRUBETZ Environmental Services (26K)
ABSTRACT
IN-SITU Thermal Oxidative Process
HRUBETZ Environmental Services
Demonstration Bulletin
EPA 540/MR-93/524
September 1993
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.
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Posted February 26, 1999
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