Thermal treatment of low permeability soils using electrical resistance heating
- Univ. of California, Berkeley, CA (United States)
The acceleration of recovery rates of second phase liquid contaminants from the subsurface during gas or water pumping operations is realized by increasing the soil and ground water temperature. Electrical heating with AC current is one method of increasing the soil and groundwater temperature and has particular applicability to low permeability soils. Several mechanisms have been identified that account for the enhanced removal of the contaminants during electrical heating. These are vaporization of liquid contaminants with low boiling points, temperature-enhanced evaporation rates of semi-volatile components, and removal of residual contaminants by the boiling of residual water. Field scale studies of electrical heating and fluid extraction show the effectiveness of this technique and its applicability to contaminants found both above and below the water table and within low permeability soils. 10 refs., 8 figs.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- OSTI ID:
- 447174
- Report Number(s):
- ORNL/TM--13305; ON: DE97050722
- Country of Publication:
- United States
- Language:
- English
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