Extraction of technetium from simulated Hanford tank wastes

Conference · Sun Oct 24 00:00:00 EDT 1993

DOI:https://doi.org/10.1080/01496399508010336· OSTI ID:10192636

Chaiko, D. J.; Vojta, Y. ^[1]; Takeuchi, M. ^[2]

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1. Argonne National Lab., IL (United States)
2. Univ. of Tokyo (Japan). Nuclear Engineering Research Lab.

Aqueous biphasic separation systems are being developed for the treatment of liquid radioactive wastes. These extraction systems are based on the use of polyethylene glycols (PEGs) for the selective extraction and recovery of long-lived radionuclides, such as {sup 129}I, {sup 75}Se, and {sup 99}Tc, from caustic solutions containing high concentrations of nitrate, nitrite, and carbonate. Because of the high ionic strengths of supernatant liquids in Hanford underground storage tanks, aqueous biphasic systems can be generated by simply adding aqueous PEG solutions directly to the waste solution. In the process, anionic species like I{sup {minus}} and TcO{sub 4}{sup {minus}} are selectively transferred to the less dense PEG phase. The partition coefficient for a wide range of inorganic cations and anions, such as sodium, potassium, aluminum, nitrate, nitrate, and carbonate, are all less than one. The authors present experimental data on extraction of technetium from several simulated Hanford tank wastes at 25{degree} and 50{degree}C.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10192636
• Report Number(s): ANL/CMT/CP-80775; CONF-931043-5; ON: DE94002362; TRN: 93:025659
• Resource Relation: Journal Volume: 30; Journal Issue: 7-9; Conference: 8. symposium on separation science and technology for energy applications,Gatlinburg, TN (United States), 24-28 Oct 1993; Other Information: PBD: [1993]
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
TECHNETIUM 99
SOLVENT EXTRACTION
HANFORD RESERVATION
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTE PROCESSING
SIMULATION
052001
400105
WASTE PROCESSING
SEPARATION PROCEDURES