Parameters Influencing the Formation of Post-Filtration Solids in the 241-AN-107 and 241-AN-102 Hanford High-Level Waste Simulants

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Envelope 'C' high-level waste simulants were prepared to represent the chemical composition of the supernates of two tanks located at the Hanford Site in Washington State. Experiments were conducted with these simulants to determine the impact of several chemical and physical parameters on the phenomena of post-filtration precipitation. Baseline experiments were conducted for flow sheet conditions, which involved a reaction of each simulant with 0.075 M strontium nitrate, 0.05 M sodium permanganate, and 1.0 M added sodium hydroxide at 50 degrees Celsius for four hours. Simulants were filtered and stored in the dark under a nitrogen blanket. Chemical and physical ... continued below

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Coates, J.T May 17, 2004.

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Envelope 'C' high-level waste simulants were prepared to represent the chemical composition of the supernates of two tanks located at the Hanford Site in Washington State. Experiments were conducted with these simulants to determine the impact of several chemical and physical parameters on the phenomena of post-filtration precipitation. Baseline experiments were conducted for flow sheet conditions, which involved a reaction of each simulant with 0.075 M strontium nitrate, 0.05 M sodium permanganate, and 1.0 M added sodium hydroxide at 50 degrees Celsius for four hours. Simulants were filtered and stored in the dark under a nitrogen blanket. Chemical and physical parameters investigated were categorized as either reaction or filtrate variables. Reaction variables examined the effect of reaction temperature, free sodium hydroxide concentration, reagent concentrations, and shear level during the precipitation reaction on post-filtration solids formation. Filtrate variables examined the effects of light intensity, temperature of the filtrate, filtration at 50 degrees Celsius, filter pore size, and oxidation-reduction potential (ORP) on post-filtration solids formation. Experiments were designed to study both primary effects and secondary effects of the parameters. Data presented for the primary effects study indicated that post-filtration solids formed with all treatments examined given sufficient time. However, in the short term (within 48 hours), reacting the simulant at flow sheet conditions but eliminating the addition of sodium hydroxide from the reaction mixture and minimizing exposure to oxygen in the filtrates minimized the formation of precipitates. In addition, the formation of post-filtration solids could also be minimized by reducing the concentration of sodium permanganate to approximately 0.01 M. In summary, the data suggests that for the base case conditions, lowered reaction temperature and the absence of added NaOH do not result in the formation of dark solids within 16-days. Similarly, the variable evaluated for the newly optimized conditions that did not result in the formation of dark solids was the 0.01 M permanganate treatment. The newly optimized conditions also did not result in the formation of dark solids. Post-filtration solids that formed in both filtrates were completely soluble in 0.5 molar nitric acid. Additionally, the mass of predominantly manganese containing solids that formed in the filtrates was small, generally in the mg/L range.

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  • Other Information: PBD: 17 May 2004

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  • Report No.: WSRC-TR-2003-00232, Rev 0
  • Grant Number: AC09-96SR18500
  • DOI: 10.2172/824527 | External Link
  • Office of Scientific & Technical Information Report Number: 824527
  • Archival Resource Key: ark:/67531/metadc780725

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  • May 17, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • May 5, 2016, 5:49 p.m.

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Coates, J.T. Parameters Influencing the Formation of Post-Filtration Solids in the 241-AN-107 and 241-AN-102 Hanford High-Level Waste Simulants, report, May 17, 2004; South Carolina. (digital.library.unt.edu/ark:/67531/metadc780725/: accessed January 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.