B - Operations – Transporting – 09 – B
Patent
B - Operations, Transporting
09
B
B09B 3/00 (2006.01) B09C 1/06 (2006.01) F26B 25/00 (2006.01)
Patent
CA 2081712
56,887 ABSTRACT OF THE DISCLOSURE The removal of organics and volatile metals from soils using thermal desorption comprises moving con- taminated materials, positioned on a belt conveyor, through a chamber under oxygen conditions, temperature conditions, and residence time effective to substantially avoid incineration of the contaminants. The method further comprises heating the contaminated material for volatilizing the contaminants and for producing a proces- sed material that is substantially decontaminated. To carry the volatilized contaminants from the chamber, a transport gas may be passed through the chamber counter- current to the movement of the contaminated material. A gas stream including the volatilized contaminants and the transport gas may be passed through a condenser and through a scrubber for producing a substantially cleaned gas and a contaminated liquid concentrate. The cleaned gas may be recycled back into the chamber as the transport gas or passed through a gas cleaning system prior to discharge into the atmosphere. The liquid concentrate is passed through a water treatment system for producing substantially cleaned water. The water may be passed through an air cooler and recycled back into the quencher or may be passed through a carbon absorption column and recycled as quench water for the processed material.
Grant David Charles
Lahoda Edward Jean
Bereskin & Parr
Westinghouse Electric Corporation
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