Evaluation of interim and final waste forms for the newly generated liquid low-level waste flowsheet

Abotsi, G.M.K.; Bostick, D.T.; Beck, D.E.

doi:10.2172/245580

Cited by 2 publications

(1 citation statement)

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“…Together, 137 Cs and 90 Sr comprise approximately 99% of the radioactivity within the Hanford Reservation storage tanks (6), and up to 70% of the total radioactive air emissions from INEEL and the Hanford Reservation (7,8). Abotsi et al (9) evaluated the composition of wastes from underground storage tanks at ORR (Melton Valley Storage Tanks) and found the predominant radioactivity to be from 137 much of the liquid tank waste to be treated as LLW (10,11), significant research efforts have focused on developing technologies to separate and sequester these radionuclides into stable and durable materials.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Sorption of Cesium and Strontium on Dispersed Kaolinite Powders

Yoo

Shinagawa

Wood

et al. 2005

Environ. Sci. Technol.

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Sorption of cesium and strontium on kaolinite powders was investigated as a means to minimize the emissions of these metals during certain high-temperature processes currently being developed to isolate and dispose of radiological and mixed wastes. In this work, nonradioactive aqueous cesium acetate or strontium acetate was atomized down the center of a natural gas flame supported on a variable-swirl burner in a refractory-lined laboratory-scale combustion facility. Kaolinite powder was injected at a postflame location in the combustor. Cesium readily vaporized in the high-temperature regions of the combustor, but was reactively scavenged onto dispersed kaolinite. Global sorption mechanisms of cesium vapor on kaolinite were quantified, and are related to those available in the literature for sodium and lead. Both metal adsorption and substrate deactivation steps are important, so there is an optimum temperature, between 1400 and 1500 K, at which maximum sorption occurs. The presence of chlorine inhibits cesium sorption. In contrast to cesium, and in the absence of chlorine, strontium was only partially vaporized and was, therefore, only partially scavengeable. The strontium data did not allow quantification of global kinetic mechanisms of interaction, although equilibrium arguments provided insight into the effects of chlorine on strontium sorption. These results have implications for the use of sorbents to control cesium and strontium emissions during high-temperature waste processing including incineration and vitrification.

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Section: Introductionmentioning

confidence: 99%