Hazardous or toxic waste destruction or containment – Destruction or containment of radioactive waste
Patent
1992-12-29
1997-06-17
Mai, Ngoclan
Hazardous or toxic waste destruction or containment
Destruction or containment of radioactive waste
423 17, 423 18, 423 20, 209 2, G21F 900
Patent
active
056407017
ABSTRACT:
Soil comprising small soil particles, clay and silt particles, humus, fine vegetation, and contaminated with soluble or insoluble radioactive species is treated by first introducing an aqueous extracting solution comprising a mixture of sodium and potassium carbonate (or bicarbonate), or ammonium carbonate (or bicarbonate) into the soil to solubilize and disperse the radioactive species into solution. The extracting solution has a pH greater than or equal to about 7.5. Contaminated fine vegetation then is separated from the soil and extracting solution. Next, an acid like hydrochloric acid is introduced into the soil. The acid is added in an amount sufficient to lower the pH of the extracting solution at which point desirable organic material will substantially precipitate or coagulate from the extracting solution. The cleansed soil particles, including organic matter, is separated from the contaminated extracting solution. Radioactive species are then removed from the extracting solution, which then may be reused.
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J.W. Assink, et al., "Extractive Methods For Soil Decontamination; A General Survey and Review of Operational Treatment Installations," Contaminated Soil, pp. 655-667, 1986.
Dietrich Albert J.
Grant David C.
Lahoda Edward J.
Mai Ngoclan
Westinghouse Electric Corporation
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