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Title: Active cooling-based surface confinement system for thermal soil treatment

A thermal barrier is disclosed for surface confinement with active cooling to control subsurface pressures during thermal remediation of shallow (5-20 feet) underground contaminants. If steam injection is used for underground heating, the actively cooled thermal barrier allows the steam to be injected into soil at pressures much higher (20-60 psi) than the confining strength of the soil, while preventing steam breakthrough. The rising steam is condensed to liquid water at the thermal barrier-ground surface interface. The rapid temperature drop forced by the thermal barrier drops the subsurface pressure to below atmospheric pressure. The steam and contaminant vapors are contained by the thermal blanket, which can be made of a variety of materials such as steel plates, concrete slabs, membranes, fabric bags, or rubber bladders.
Inventors:
 [1];  [2]
  1. (Livermore, CA)
  2. (Pleasanton, CA)
Issue Date:
OSTI Identifier:
871206
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5681130
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
active; cooling-based; surface; confinement; thermal; soil; treatment; barrier; disclosed; cooling; control; subsurface; pressures; remediation; shallow; 5-20; feet; underground; contaminants; steam; injection; heating; actively; cooled; allows; injected; 20-60; psi; confining; strength; preventing; breakthrough; rising; condensed; liquid; water; barrier-ground; interface; rapid; temperature; drop; forced; drops; pressure; below; atmospheric; contaminant; vapors; contained; blanket; variety; materials; steel; plates; concrete; slabs; membranes; fabric; bags; rubber; bladders; steam injection; active cooling; liquid water; thermal barrier; atmospheric pressure; ground surface; rapid temperature; actively cooled; oil treatment; thermal remediation; surface confinement; rising steam; temperature drop; /405/62/588/