Furnaces – Process – Incinerating refuse
Patent
1991-01-23
1992-02-11
Yuen, Henry C.
Furnaces
Process
Incinerating refuse
110215, 110216, F23G 502
Patent
active
050867172
ABSTRACT:
The invention provides a method and apparatus for removing VOC's from soil, particularly soil contaminated with gasoline, diesel fuel, or the like. The method includes the steps of heating the soil in a burner-heated drum to substantially vaporize the VOC's. The vaporized VOC's are then ducted to an air scrubber where the VOC's are substantially entirely absorbed into the scrubber water, along with any airborne soil particulates. The VOC and particulate-laden water is then conducted to a settling basin where the particulates are allowed to settle out. Particulate-free VOC-laden water is withdrawn from the basin and transported to an air stripper where the VOC's are vaporized. The vaporized VOC's are then conducted to the drum burner, where they are burned to help heat the drum and additional soil that is being processed. The air stripper water, from which the VOC's have been removed, is returned to a clean water reservoir for re-use in the air scrubber.
Burning the VOC's in the drum burner results in a significant advantages. The VOC's act as a partial fuel source for the drum burner, and are disposed of without the need for expensive techniques such as carbon filtration and afterburners. Additionally, the water that is used in the scrubber, settling basin and stripper can be recycled through a clean water reservoir. The water and VOC closed-loop systems result in a soil remediation method and apparatus that can process soil at a high volume rate and in an efficient, inexpensive manner.
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Kaihoi Gregory P.
West David C.
Yuen Henry C.
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