Thermal Technologies

TCH/ISTD

TCH Higher Temperature

TCH Moderate Temperature

TCH Lower Temperature

SEE

ERH/ET-DSP™

Combinations

Think Thermal

TCH Higher Temperature

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Cross-section depicting snapshot of heatup and vapor flow between two heater-vacuum wells (left and right sides), with a central heater-only well (Click to enlarge)

TCH is used for the thermal desorption and destruction of Semi-Volatile Organic Compounds (SVOCs) such as PAHs, PCBs, pesticides, and dioxins. TCH is the only major in situ thermal remediation technology capable of achieving target treatment temperatures above the boiling point of water. With the application of higher temperatures for (>100°C) for treatment of SVOCs, most contaminants are destroyed in the soil before reaching the surface. Contaminants that have not been destroyed in situ are removed from the produced vapor stream at the surface with an Air Quality Control system.

Typical target treatment temperatures for SVOCS (measured at centroid locations between the heaters) are above 480°F (250°C). In Situ Thermal Desorption (ISTD) utilizes TCH to effectively raise the soil temperature by installing an array of heater wells while simultaneously applying a vacuum to subsurface soils through the installation of vapor collectors to capture the volatilized contaminants and steam. The volatilized contaminant vapors are then extracted through vapor collection points, collected, and treated in a site-specifically designed Air Quality Control system. TerraTherm prevents fugitive emissions by applying a vacuum to the treatment zone beneath a surface vapor barrier.