Thermal DesorptionLow Temperature Thermal Desorption (LTTD) is an ex-situ remediation technology that uses heat to physically separate contaminants from excavated soils. Low Temperature Thermal Desorption Units are designed to heat contaminated soils in a primary treatment unit (rotary kiln) to temperatures sufficient to cause the contaminants to volatilize and desorb (physically separate) from the soil. The vaporized hydrocarbons are then treated in a secondary treatment unit (e.g., an afterburner/thermal oxidizer) where they are destroyed prior to discharge to the atmosphere.
Some preprocessing and postprocessing of soil is necessary when using LTTD. Excavated soils are first screened to remove large (greater than 2 inches in diameter) objects. These may be sized (e.g., crushed or shredded) and then introduced back into the feed material. After treatment soils are rehydrated to control fugitive emissions.
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