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Method for acid oxidation of radioactive, hazardous, and mixed organic waste materials

United States Patent

5,960,368
September 28, 1999
View the Complete Patent at the US Patent & Trademark Office
Savannah River National Laboratory - Visit the Technology Transfer Website
The present invention is directed to a process for reducing the volume of low level radioactive and mixed waste to enable the waste to be more economically stored in a suitable repository, and for placing the waste into a form suitable for permanent disposal. The invention involves a process for preparing radioactive, hazardous, or mixed waste for storage by contacting the waste starting material containing at least one organic carbon-containing compound and at least one radioactive or hazardous waste component with nitric acid and phosphoric acid simultaneously at a contacting temperature in the range of about 140.degree. C. to about 210 .degree. C. for a period of time sufficient to oxidize at least a portion of the organic carbon-containing compound to gaseous products, thereby producing a residual concentrated waste product containing substantially all of said radioactive or inorganic hazardous waste component; and immobilizing the residual concentrated waste product in a solid phosphate-based ceramic or glass form.
Pierce; Robert A. (Aiken, SC), Smith; James R. (Corrales, NM), Ramsey; William G. (Aiken, SC), Cicero-Herman; Connie A. (Aiken, SC), Bickford; Dennis F. (Folly Beach, SC)
Westinghouse Savannah River Company (Aiken, SC)
08/ 861,483
May 22, 1997
The United States Government has rights in this invention pursuant to Contract No. DEAC0989SR18035 between the U.S. Department of Energy and Westinghouse Savannah River Company.