In situ decontamination of spills and landfills by focussed micr

Details In situ decontamination of spills and landfills by focussed micr In situ decontamination of spills and landfills by focussed micr

1990-07-30

1991-12-31

Taylor, Dennis L.

Hydraulic and earth engineering

Soil remediation

In situ contaminant removal or stabilization

405131, 405258, B09B 100

Patent

active

050767275

ABSTRACT:
Moist, warm, clean air from a vapor treatment system is injected into wells which are screened only at the contaminated depth forcing vapor flow only through the contaminated region. Intermediate the injection wells is an extraction well which is also screened only at the contaminated depth. A vacuum is drawn on the extraction well drawing the flushing vapors from the injection wells and toward the extraction well through the contaminated soil thereby entraining some of the contaminants. The contaminants are preferably non-volatile hydrocarbons such as diesel fuel, aviation and jet fuel, crude oil or pesticides. The contaminated, flushing vapor is then treated and recycled. An MW/RF heating system heats the earth's surface and the contaminated soil, thereby enhancing volatilization of the contaminants and their removal via the vapor flushing system. By screening the wells only through the contaminated zone and controlling the flow of clean, moist, warm air through only the contaminated zone, thereby maintaining the contaminated zone in a moist state, the entire energy of the system is focussed on the contaminated region.

REFERENCES:
patent: 4401569 (1983-08-01), Jhareri et al.
patent: 4518399 (1985-05-01), Craskell et al.
patent: 4590348 (1986-05-01), Lahti et al.
patent: 4745850 (1988-05-01), Bastian et al.
patent: 4765902 (1988-08-01), Ely et al.
patent: 4842448 (1989-06-01), Koerner et al.
patent: 4850745 (1989-07-01), Hater et al.
patent: 4973811 (1990-11-01), Bass

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