Pilot study of enclosed thermal soil aeration for removal of volatile organic contamination at the McKin superfund site

During the winter and spring of 1986 sandy soils contaminated with volatile organic chemicals were successfully treated during a pilot study of an enclosed thermal soil aeration process at the McKin Superfund site in Gray, Maine. Excavated soil containing up to 3310 ppm of trichloroethylene (TCE) was fed into a large rotating drum and mixed at 300°F. Aerated soil was then solidified with cement and water and returned to the on-site excavation location. Exhausted air from the enclosed aeration process was treated in a baghouse, a scrubber, and a vapor phase carbon bed prior to atmospheric release. Continuous air monitoring for organic vapors and particulates took place at the site perimeter and for organic vapors at onsite locations. Techniques to minimize uncontrolled volatilization of organic chemicals from the soil during excavation and aeration and to control dust emissions were implemented. Results of this pilot study indicate that concentrations of volatile organic contaminants routinely were reduced...