In-situ remediation and vitrification of contaminated soils, dep

Details In-situ remediation and vitrification of contaminated soils, dep In-situ remediation and vitrification of contaminated soils, dep

1992-09-09

1994-01-04

Reese, Randolph A.

Hazardous or toxic waste destruction or containment

Containment

Solidification, vitrification, or cementation

588260, 405128, 405131, 405269, 405271, E02D 1914, B09B 100

Patent

active

052762530

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, buried 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, Jr.
patent: 5011329 (1991-04-01), Nelson et al.
patent: 5100259 (1992-03-01), Buelt et al.
patent: 5181795 (1993-01-01), Circeo, Jr. et al.

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