How Thermal Remediation Mobilizes and Captures Contaminants

Thermal remediation uses heat to support removal of contaminants from soil and groundwater. In GEO's Gas Thermal Remediation systems, fuel-fired units supply thermal conduction heater wells, which transfer heat to the surrounding formation. Other thermal approaches use electrical resistance or steam injection.

One documented example: GEO's thermal remediation installation in Zhejiang, China.

Heating can increase volatility, reduce the viscosity of some separate-phase liquids, and promote desorption and steam-assisted removal. The relevant mechanisms and required temperature depend on the contaminants, moisture, geology, and treatment objectives. Some chemical reactions may also occur, but removal from soil should not automatically be described as complete chemical destruction.

Soil vapor and multiphase extraction wells collect the mobilized vapor and liquid. Aboveground equipment separates phases and treats the recovered streams using an appropriate combination of condensation, carbon adsorption, oxidation, or other processes.

Conceptual GTR heater well and separate vapor extraction well.

Temperature and pressure measurements support process control. Sampling and treatment-system measurements establish removal performance and whether the specified cleanup and discharge criteria have been met.