Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Patent
1991-08-22
1993-09-07
Taylor, Dennis L.
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
110346, B09B 300
Patent
active
052422453
ABSTRACT:
A method and apparatus for recovering hydrocarbons from soils which includes introducing the soil material to be treated through a vacuum seal and into a thermal processor which is operated under reduced pressure. The processor includes a centralized heating unit surrounded by concentrically mounted rotatable cylinders. One of the cylinders has a continuous auger extending from the surface thereof and proximate to the other cylinder by way of which the material is conveyed through the processor with a relative of rotation of the cylinders being controlled to ensure optimum vapor separation of the hydrocarbons at low temperature after which the vapors are recovered and condensed. In a preferred embodiment an expansion chamber and supplemental concentric auger heater are used to insure substantial complete separation of the hydrocarbons from the soil prior to discharging the treated soil from the apparatus.
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