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In Situ Thermal Treatment


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  2. In Situ Thermal Treatment
In Situ Thermal Treatment
Overview In situ thermal treatment methods move or “mobilize” harmful chemicals in soil and groundwater using heat. The chemicals move through soil and groundwater toward wells where they are collected and piped to the ground surface to be treated using other cleanup methods. Thermal treatment is described as “in situ” because the heat is applied underground directly to the contaminated area.
Example of In Situ Thermal Treatment using Electrical resistance heating (ERH).
How Does it Work In situ thermal treatment methods heat contaminated soil, and sometimes nearby groundwater, to very high temperatures. The heat vaporizes (evaporates) the chemicals and water changing them into gases. These gases, also referred to as “vapors,” can move more easily through soil. The heating process can make it easier to remove NAPLs from both soil and groundwater. High temperatures also can destroy some chemicals in the area being heated. The chemical and water vapors are pulled to collection wells and brought to the ground surface by applying a vacuum. The vapors are then treated above ground using one of several cleanup methods available.

In situ thermal methods generate heat in different ways:

  • Electrical resistance heating (ERH) delivers an electrical current between metal rods called “electrodes” installed underground. The heat generated as movement of the current meets resistance from soil converts groundwater and water in soil into steam, vaporizing contaminants.

  • Steam enhanced extraction (SEE) injects steam underground by pumping it through wells drilled in the contaminated area. The steam heats the area and mobilizes and evaporates contaminants.

  • Thermal conduction heating (TCH) uses heaters placed in underground steel pipes. TCH can heat the contaminated area hot enough to destroy some chemicals.

  • Pollutants Removed NAPLs
    Area of Application Soil and Groundwater Remediation
    Environmental Footprint Unknown
    Area Footprint Unknown
    Treatment Time few months to a few years, Morderate
    Treatment Capacity 5 tons/day, Morderate
    Treatment Cost Unknown
    Data Sources: https://clu-in.org/download/Citizens/a_citizens_guide_to_in_situ_thermal_treatment.pdf

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