Vapor-extraction system for removing hydrocarbons from soil
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United States of America Patent
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-
Nov 1, 1994
Grant Date -
N/A
app pub date -
May 17, 1993
filing date -
May 17, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is a closed-loop, thermal process for remediating soil contaminated with hydrocarbon chemicals; it is particularly well suited for the remediation of soils containing hydrocarbons with relatively high boiling points and for the remediation of soils which contain clays or silts. The process uses a combination of at least one extraction well which is used to withdraw vapors from contaminated soil and at least one injection well, called a 'fire' well which is used to burn both a source of hydrocarbon fuel and all of the hydrocarbons present in the recovered vapors and then inject the combustion gases into contaminated soil. The heat in the combustion gases is used to raise the temperature of the contaminated soil and volatilize hydrocarbons in the soil. Dielectric heating can be used to supplement the heating performed by the combustion gases.
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