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Characterization of High Phosphate Radioactive Tank Waste and Simulant Development.

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Title: Characterization of High Phosphate Radioactive Tank Waste and Simulant Development.
Authors: LUMETTA, GREGG J.1 gregg.lumetta@pnl.gov, MCNAMARA, BRUCE K.1, BUCK, EDGAR C.1, FISKUM, SANDRA K.1, SNOW, LANÉE A.1
Source: Environmental Science & Technology. 10/15/2009, Vol. 43 Issue 20, p7843-7848. 6p.
Subjects: Radioactive waste characterization, Plutonium industry, Radioactive waste disposal, Underground storage tanks, Hazardous waste site leaching, Hanford Site (Wash.), Savannah River Site (S.C.), Industry & the environment
Geographic Terms: Washington (State), South Carolina
Abstract: A sample at high-level radioactive tank waste was characterized to provide a basis for developing a waste simulant. The simulant is required for pilot-scale testing of pretreatment processes in a nonradiological facility. The waste material examined was derived from the bismuth phosphate process, which was the first industrial process implemented to separate plutonium from irradiated nuclear fuel. The bismuth phosphate process sludge is a complex mixture rich in bismuth, iron, sodium, phosphorus, silicon, and uranium. The form of phosphorus in this particular tank waste material in of specific importance because that is the primary component (other than water-soluble sodium salts) that must be removed from the high-level waste solids by pretreatment. This work shows unequivocally that the phosphorus in this waste material is not present as bismuth phosphate. Rather, the phosphorus appears to be incorporated mostly into an amorphous iron(III) phosphate phase. The bismuth in the sludge solids is best described as BiFeO3. The behavior of phosphorus during caustic leaching of the bismuth phosphate process sludge solids is also discussed. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:A sample at high-level radioactive tank waste was characterized to provide a basis for developing a waste simulant. The simulant is required for pilot-scale testing of pretreatment processes in a nonradiological facility. The waste material examined was derived from the bismuth phosphate process, which was the first industrial process implemented to separate plutonium from irradiated nuclear fuel. The bismuth phosphate process sludge is a complex mixture rich in bismuth, iron, sodium, phosphorus, silicon, and uranium. The form of phosphorus in this particular tank waste material in of specific importance because that is the primary component (other than water-soluble sodium salts) that must be removed from the high-level waste solids by pretreatment. This work shows unequivocally that the phosphorus in this waste material is not present as bismuth phosphate. Rather, the phosphorus appears to be incorporated mostly into an amorphous iron(III) phosphate phase. The bismuth in the sludge solids is best described as BiFeO3. The behavior of phosphorus during caustic leaching of the bismuth phosphate process sludge solids is also discussed. [ABSTRACT FROM AUTHOR]
ISSN:0013936X
DOI:10.1021/es9013745