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- In-situ_thermal_desorption abstract "In-Situ Thermal Desorption (ISTD) is a remediation process where heat and vacuum are applied simultaneously to subsurface soils, either with an array of vertical heater/vacuum wells, or, less commonly, with subsurface heater blankets. Thermal conduction accounts for the majority of heat flow from the high temperature (~1300° F) heat sources. As soil is heated, volatile contaminants in the soil are vaporized by a number of mechanisms, including: (1) evaporation into the subsurface air stream introduced by application of vacuum, (2) steam distillation into the water vapor stream, (3) boiling, (4) oxidation, and (5) pyrolysis. The vaporized water, contaminants, and natural organic compounds are drawn by the vacuum in a counter-current direction to the heat flow into the vacuum source at the wells or blankets. Compared to fluid injection process, conductive heat injection is very uniform in its vertical and horizontal movement. Furthermore, transport of the vaporized contaminants is enhanced by the creation of permeability that results from drying and shrinking the soil. Flow paths are created even in tight silt and clay layers, which allow escape and capture of the vaporized contaminants. The combined effectiveness of both heat and vapor flow yields nearly 100% sweep efficiency. In addition, very high displacement efficiency can be reached in the heated soil. This occurs because the soil can, if needed, be heated to high temperatures for prolonged times. Field project experience has confirmed that a combination of high temperature and long times result in extremely high overall removal of even the high boiling point contaminants in the soil. Data indicate that 95 to 99% or more of the contaminant mass is destroyed in situ, as the vaporized contaminants pass through superheated soil close to the heater-vacuum wells. In practice, produced vapors are treated with an air pollution control (APC) system to remove any vaporized contaminants that have not been destroyed in situ.".
- In-situ_thermal_desorption wikiPageExternalLink insitutherm.pdf.
- In-situ_thermal_desorption wikiPageExternalLink 4-9.html.
- In-situ_thermal_desorption wikiPageExternalLink www.terratherm.com.
- In-situ_thermal_desorption wikiPageExternalLink www.tpstech.com.
- In-situ_thermal_desorption wikiPageID "35686296".
- In-situ_thermal_desorption wikiPageRevisionID "572624856".
- In-situ_thermal_desorption hasPhotoCollection In-situ_thermal_desorption.
- In-situ_thermal_desorption subject Category:Pollution_control_technologies.
- In-situ_thermal_desorption subject Category:Soil_contamination.
- In-situ_thermal_desorption subject Category:Waste_treatment_technology.
- In-situ_thermal_desorption comment "In-Situ Thermal Desorption (ISTD) is a remediation process where heat and vacuum are applied simultaneously to subsurface soils, either with an array of vertical heater/vacuum wells, or, less commonly, with subsurface heater blankets. Thermal conduction accounts for the majority of heat flow from the high temperature (~1300° F) heat sources.".
- In-situ_thermal_desorption label "In-situ thermal desorption".
- In-situ_thermal_desorption sameAs m.0jkxqsw.
- In-situ_thermal_desorption wasDerivedFrom In-situ_thermal_desorption?oldid=572624856.
- In-situ_thermal_desorption isPrimaryTopicOf In-situ_thermal_desorption.