This document is available in the Adobe Acrobat PDF Format. The key feature of the system are the intermeshed hollow screw conveyors, which simultaneously heat, mix, and convey the contaminated soil through the thermal processor. The LT thermal processor consists of two jacketed troughs, one above the other. Each trough houses four intermeshed, hollow screw conveyors. Contaminated soil or sludge is fed into the thermal processor, where hot oil circulating through the troughs and screws heats the soil to 400 to 500 EF driving off contaminants.
Treated soil is discharged into a conditioner to cool the soil and minimize dust emissions.
Desorption gases pass through a baghouse, a series of condensers, and a carbon adsorption unit before release to the atmosphere. The water phase is treated in a carbon adsorption system prior to discharge. The system was tested on lagoon sludge from the ADC site. This sludge was contaminated with a variety of VOCs and SVOCs.