Cryogenic method and system for remediating contaminataed earth
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United States of America Patent
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Sep 16, 1997
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Feb 18, 1993
priority date (Note) -
Expired
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Abstract
An advancing freeze front is established in a porous region adjacent to or within contaminated earth. A flow of contaminated liquid phase water migrates toward the freeze front and a concentration of impurities is established in front of the advancing freeze front. When the freeze front reaches a collection zone, at least a portion is melted and the resultant water bearing concentrated impurities is collected and removed. This process may be repetitively performed. A liquid convection flow can be established transverse to the direction of freeze-front advancement to stabilize the solid/liquid interface at the freeze-front.
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