The simultaneous removal of technetium and iodine from Hanford tank waste
Journal Article
·
· Chemical Engineering Journal
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
The simultaneous removal of radionuclides technetium-99 and iodine-129 from an actual decontaminated Hanford tank waste sample (a mixture of decontaminated waste from tanks 241-AP-105 and 241-AP-107) was demonstrated for the first time in this work. A series of commercially available ion exchange resins were evaluated in batch contact tests in the tank waste, and all showed removal of both Tc and I. The highest Tc removal was observed for Purolite A530e while the highest iodine removal was observed for ResinTech SIR-110-MP. Batch tests in simulated tank waste with these two resins showed that the SIR-110-HP-MP had consistently higher Kd for both pertechnetate and iodide and much higher Kd than previous works on Tc removal from Hanford waste. As such, the SIR-110-MP was evaluated in a dual -column (lead/lag) test processing 5.2L of the tank waste mixture showing 60% breakthrough of Tc on the lead column and no significant breakthrough on the lag after 625 bed volumes (BV, 6 mL size) while significant iodine breakthrough (>50%) occurred after 28 BV. The limited iodine uptake was attributed to the column conditions generating mass transfer limitations. A fraction of the Tc and I was not captured by the resin (<10%) in either the batch tests or column tests. The iodine fraction was identified to be an iodide, likely organo-iodide. The fraction of the Tc was identified as a non-pertechnetate species, which is the first time non-pertechnetate has been identified in AP-105 and AP-107 tanks, although the exact species is still unknown.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE Office of Environmental Management (EM); USDOE Office of Environmental Management (EM), Technology Development
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 2458236
- Alternate ID(s):
- OSTI ID: 2345839
- Report Number(s):
- PNNL-SA--189635
- Journal Information:
- Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Vol. 490; ISSN 1385-8947
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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