GEO’s proprietary Electrical Resistance Heating (ERH) Technology is an intensive in situ environmental remediation method that uses the flow of alternating current electricity to heat soil and groundwater and vaporize contaminants. Alternating electric current is passed through a targeted soil volume between subsurface electrode elements. Operating voltages can be varied to adapt for different lithologies and dynamic resistive properties of many soil types. The resistance to electrical flow that exists in the soil causes the formation of heat; resulting in an increase in temperature until the
boiling point of water at depth is reached. After reaching this temperature, further energy input
causes a phase change, forming steam and removing volatile contaminants. ERH – like TCH and
SEE heating techniques – is typically cost effective when used for treating contaminant source areas.
GEO’s ERH Technology is uniquely suited to adapt to highly permeable formations in addition to the low permeability soils typically treated. GEO’s ERH electrodes can introduce steam into the heated subsurface to more completely introduce steam into highly permeable layers.