TerraTherm - a Cascade Company

Combination of In Situ Thermal Desoption or Electrical Resistance Heating and Steam Enhanced Extraction

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Combining In Situ Thermal Remediation technologies provides an optimal solution for many sites. Steam Enhanced Extraction (SEE) may be combined with either Electrical Resistance Heating (ERH), or with In Situ Thermal Desorption (ISTD). Together these combinations comprise a glove-fit design for sites with complex geologies (e.g., silty clay aquitards, and sandy or gravelly aquifers).

A combination of In Situ Thermal Desorption or Electrical Resistance Heating and Steam Enhanced Extraction often addresses the entire target treatment zone (TTZ). At each well location, either a single full-length Thermal Conduction Heating element or one or more Electrical Resistance Heating electrodes is used along the depth interval of the low-permeability material, while steam is injected into wells screened in the permeable zones. Extraction wells exert hydraulic and pneumatic control.

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