Method for remediating sites contaminated with toxic waste

Details Method for remediating sites contaminated with toxic waste Method for remediating sites contaminated with toxic waste

1999-02-11

2000-04-11

Griffin, Steven P.

Hazardous or toxic waste destruction or containment

Destruction or containment of radioactive waste

588200, 588202, 588203, 588205, 588206, 588207, 588215, 588231, 588236, 588238, 588 18, 423 23, 423 24, 423 27, 423 32, 423 33, 134 2, 134 10, 134 34, 134 36, 210749, 210757, 405263, G21F 900, A62D 300, B01D 1100, C02F 170, B01J 800

Patent

active

060490217

ABSTRACT:
Methods for decontaminating toxic waste, particularly solid carrier materials, such as soil contaminated with a toxin, or solid mixed wastes are more efficiently decontaminated with solvated electrons by first extracting the toxin from the carrier with a nitrogenous base at elevated temperatures, followed by a temperature reduction before initiating chemical reduction of the toxin with solvated electrons. Pre-extraction of the toxin at elevated temperatures followed by temperature reduction minimizes competing side reactions, improves selectivity of solvated electrons for the toxin and improves the economics of the process with more efficient metal utilization. The process can be performed without separation of the toxin from the extraction vessel holding the solid carrier material. Alternatively, elevated temperatures can be used to perform one or more extractions of toxin with nitrogenous base followed by reduction with solvated electrons by performing the reaction in a separate reactor. The processes of the invention are useful in the destruction of virtually any chemically reducible hazardous substance.

REFERENCES:
patent: 4853040 (1989-08-01), Mazur et al.
patent: 5110364 (1992-05-01), Mazur et al.
patent: 5495062 (1996-02-01), Abel
patent: 5516968 (1996-05-01), Abel
patent: 5613238 (1997-03-01), Mouk et al.

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