Hazardous or toxic waste destruction or containment – Containment – Solidification – vitrification – or cementation
Patent
1994-12-19
1998-01-13
Taylor, Dennis L.
Hazardous or toxic waste destruction or containment
Containment
Solidification, vitrification, or cementation
405128, 405131, 405269, 405271, 588260, A62D 300, E02D 1914, B09B 100
Patent
active
RE0357154
ABSTRACT:
A method is disclosed in which a plasma arc torch is used to vitrify and remediate a site containing contaminated soils, resulting from a hazardous material deposit or spill, or contaminated buried objects. The contaminated earthen material or subterranean deposit is pyrolyzed, melted or solidified by the plasma torch which is energized at the bottom of a cased, vertical borehole, and then gradually raised to the surface. An array of boreholes, appropriately spaced, will remediate an entire mass of contaminated material. Similarly, burled objects such as metal drums containing contaminants and underground storage tanks may be selectively remediated at their specific buried depth. Similar use is made of the plasma torch in a second embodiment with the additional step of processing at selected underground locations in the borehole array to create a sealed horizontal layer, vertical cutoff walls or a sealed basin as a barrier against further leaching of contaminants into surrounding soil and groundwater. Gaseous by-products of the pyrolysis process are collected, treated and processed, as appropriate.
REFERENCES:
patent: 4376598 (1983-03-01), Brouns et al.
patent: 4776409 (1988-10-01), Manchak
patent: 5011329 (1991-04-01), Nelson et al.
patent: 5100259 (1992-03-01), Buelt et al.
patent: 5181795 (1993-01-01), Circeo et al.
patent: 5181797 (1993-01-01), Circeo et al.
Technical Paper entitled: "An Innovative Process For The In-Situ Waste Destruction And Vitrification Of Buried Hazardous And Mixed Wastes".
Examiner's Statement of Reasons for Allowance from the official file of the '795 patent.
Official Action dated Apr. 2, 1992 from the prosecution history of the '797 patent.
Letter sent by Reissue Applicant's patent counsel to the co-authors of the Spectrum '94 technical paper.
Response to letter sent by Reissue Applicants' patent counsel on behalf of co-author J. K. Wittle.
Declaration of Salvador L. Camacho.
Camacho Salvador L.
Circeo, Jr. Louis J.
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