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| Electrical resistance heating ： ウィキペディア英語版 |
Electrical resistance heating remediation
Electrical Resistance Heating (ERH) is an intensive in situ environmental remediation method that uses the flow of alternating current electricity to heat soil and groundwater and evaporate contaminants. Electric current is passed through a targeted soil volume between subsurface electrode elements. 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 is typically more cost effective when used for treating contaminant source areas.
== History ==
Three-phase heating (see Technology below) was originally created to enhance oil recovery. This design was patented in 1976 by Bill Pritchett of ARCO. The patent has expired and is now available for public use.
Six-phase heating (see Technology below) was created and patented for the US Department of Energy (DOE) in the 1980s for use on DOE sites as well as commercial applications.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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