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Title: System for enhanced destruction of hazardous wastes by in situ vitrification of soil

The present invention comprises a system for promoting the destruction of volatile and/or hazardous contaminants present in waste materials during in situ vitrification processes. In accordance with the present invention, a cold cap (46) comprising a cohesive layer of resolidified material is formed over the mass of liquefied soil and waste (40) present between and adjacent to the electrodes (10, 12, 14, 16) during the vitrification process. This layer acts as a barrier to the upward migration of any volatile type materials thereby increasing their residence time in proximity to the heated material. The degree of destruction of volatile and/or hazardous contaminants by pyrolysis is thereby improved during the course of the vitrification procedure.
  1. (Richland, WA)
Issue Date:
OSTI Identifier:
Battelle Memorial Institute (Richland, WA) PNNL
Patent Number(s):
US 5024556
Contract Number:
Research Org:
Country of Publication:
United States
enhanced; destruction; hazardous; wastes; situ; vitrification; soil; comprises; promoting; volatile; contaminants; waste; materials; processes; accordance; cold; cap; 46; comprising; cohesive; layer; resolidified; material; formed; mass; liquefied; 40; adjacent; electrodes; 10; 12; 14; 16; process; barrier; upward; migration; type; increasing; residence; time; proximity; heated; degree; pyrolysis; improved; course; procedure; situ vitrification; residence time; hazardous waste; waste material; waste materials; hazardous wastes; vitrification process; cold cap; heated material; type materials; enhanced destruction; type material; /405/