Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Patent
1993-05-04
1995-09-12
Reese, Randolph A.
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
405131, 166272, 166302, 166303, 166306, E02D 311
Patent
active
054492513
ABSTRACT:
A dynamic underground stripping process removes localized underground volatile organic compounds from heterogeneous soils and rock in a relatively short time. This method uses steam injection and electrical resistance heating to heat the contaminated underground area to increase the vapor pressure of the contaminants, thus speeding the process of contaminant removal and making the removal more complete. The injected steam passes through the more permeable sediments, distilling the organic contaminants, which are pumped to the surface. Large electrical currents are also applied to the contaminated area, which heat the impermeable subsurface layers that the steam has not penetrated. The condensed and vaporized contaminants are withdrawn by liquid pumping and vacuum extraction. The steam injection and electrical heating steps are repeated as necessary. Geophysical imaging methods can be used to map the boundary between the hot, dry, contamination-free underground zone and the cool, damp surrounding areas to help monitor the dynamic stripping process.
REFERENCES:
patent: 4956535 (1990-09-01), Buelt et al.
patent: 5011329 (1991-04-01), Nelson et al.
patent: 5018576 (1991-05-01), Udell et al.
patent: 5076727 (1991-12-01), Johnson et al.
patent: 5249888 (1993-10-01), Braithwaite et al.
Aines Roger D.
Buetnner Harley M.
Daily William D.
Newmark Robin L.
Ramirez Abelardo L.
Grzybicki Daryl S.
Reese Randolph A.
Ricci John A.
Sartorio Henry P.
The Regents of the University of California
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