Drying and gas or vapor contact with solids – Process – With nondrying treating of material
Patent
1993-05-14
1994-11-08
Gromada, Denise L.
Drying and gas or vapor contact with solids
Process
With nondrying treating of material
34510, 34216, 34228, 34500, F26B 700
Patent
active
053615140
ABSTRACT:
The removal of organics and volatile metals from soils using thermal desorption comprises moving contaminated materials, positioned on a belt conveyor, through a chamber (32) under oxygen conditions, temperature conditions, and residence time effective to substantially avoid incineration of the contaminants, while volatilizing the contaminants and producing a processed material that is substantially decontaminated, where the volatilized contaminants are carried from the chamber (32) by a transport gas which is passed through a packed tower (70) where quench/scrubbing liquid flows countercurrent to gas flow, for producing a substantially cleaned gas and a contaminated liquid concentrate. The gas may be passed through a further gas cleaning system (86) prior to discharge into the atmosphere, while the liquid concentrate is passed through a water treatment system (90) for producing substantially cleaned water which may be passed through an air cooler (92) and recycled back to cool the processed material. Steam from moist contaminated material can be used as a cocurrent transfer gas.
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Cash Donald W.
Lahoda Edward J.
Paffenbarger John A.
Paulson C. Keith
Seagle Jerry C.
Cillo Daniel P.
Gromada Denise L.
Westinghouse Electric Corporation
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