Thermal Desorption

Thermal Desorption Unit Thermal desorption technology is based on a physical separation system. The process desorbs (physically separates) organics from the soil without decomposition. Volatile and semi-volatile organics are removed from contaminated soil in thermal desorbers at 95-315°C for low-temperature thermal desorption (also called soil roasting), or at 315-340°C for high-temperature thermal desorption.

To transport the volatilised organics and water to the gas treatment system, the process uses an inert carrier gas. The gas treatment units can be condensers or carbon adsorption units, which will trap organic compounds for subsequent treatment or disposal. The units can also be afterburners or catalytic oxidizers that destroy the organic constituents.

The bed temperatures and residence times of the desorbers are designed to volatilise selected contaminants, not to oxidize them. Certain less volatile compounds may not be volatilised at low temperatures.

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This flowchart illustrates all possible stages of the remediation process and is fully interactive; click on each process box for a detailed description...