Crystalline Silicotitanate (CST) Ion Exchange Media Performance Evaluations in SRS Average Supernate Simulant and Tank 10H Waste Solution to Support TCCR

King, William D.; Hamm, L.L.; Coleman, Charles; Fondeur, F. F.; Reboul, S.

doi:10.2172/1457680

Cited by 14 publications

(35 citation statements)

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“…This value is slightly lower than ZAM modeling predicts, at 1582 mL/g, but is within the range of experimental and analysis variability. Similarly, this batch of CST exhibited a measured Kd of 1701 mL/g, when measured previously at 23 °C and using a different batch of simulant [3].…”

Section: Distribution Coefficient Resultssupporting

confidence: 71%

“…The subsequent modeling with ZAM indicated a correction factor was needed to adjust the results to match the isotherm. Conversely, samples of the same batch of CST exhibited normal cesium removal behavior with SRS Average simulant, as shown in Table 1-2 [3]. Comparison of the simulant results to the predicted value from the ZAM computer model indicates a binder dilution factor of 0.76, which is in the normal range.…”

Section: List Of Figuresmentioning

confidence: 93%

“…It was from production batch IONSIV R9120-B, Lot #2099000034 (Mat. #8103701-556, Sub-sample from CUA #125953-A) which had undergone the laboratory pretreatment method as described in previous reports [3].…”

Section: Cst Media Pretreatmentmentioning

confidence: 99%

See 2 more Smart Citations

Preliminary Determination of the Impact of Alkaline Earth Metals on Crystalline Silicotitanate

Taylor-Pashow

Hang

McCabe

2020

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Section: Distribution Coefficient Resultssupporting

confidence: 71%

Section: List Of Figuresmentioning

confidence: 93%

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Preliminary Determination of the Impact of Alkaline Earth Metals on Crystalline Silicotitanate

Taylor-Pashow

Hang

McCabe

2020

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“…Two samples of the predominant TCCR column CST media from production batch IONSIV R9120-B, Lot #2099000034 (Mat. #8103701-556, Sub-sample from CUA #125953-A) which had been pretreated in two separate ways as described in previous reports [8,9] were used for equilibrium testing. The pretreatment methods varied in both the total volume of 3 M NaOH used and the contact time, with the field pretreatment method utilizing much less caustic solution but more time than the laboratory method.…”

Section: Experimental Methods and Modeling Approach 21 Cst Media Prementioning

confidence: 99%

Characterization and CST Batch Contact Equilibrium Testing of Aged TCCR Tank 10H Batch 1A and 2 Process Supernate Samples

King

Taylor-Pashow

Hang

et al. 2019

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The Tank Closure Cesium Removal (TCCR) system uses ion exchange columns filled with Crystalline Silicotitanate (CST) media to process radioactive waste solutions for the removal of Cs-137. TCCR currently focuses on dissolving Savannah River Site (SRS) Tank 10H waste (primarily sodium saltcake solids) within the tank followed by at-tank ion exchange column treatment. Previous equilibrium batch contact tests conducted in the SRNL Shielded Cells laboratory and associated analyses indicated that CST cesium removal performance was lower than predicted by ZAM modeling for TCCR Tank 10H Production Supernate Batch 1A. An average cesium distribution coefficient of 1,948 mL/g which corresponds to 94.1% Cs + removal was observed for Batch 1A supernate at 38 °C in January of 2019 using laboratory pretreated IONSIV™ R9120-B a CST from Lot #209900034 (predominant TCCR CST batch) at a phase ratio of 122 mL/g. This cesium loading was approximately 32% lower than model predictions, presumably due to ion exchange competition or fouling associated with alkaline earth or transition metals present in the solutions at low levels. The current testing was designed to: 1) evaluate whether supernate compositional changes during storage would result in improved cesium removal performance with CST, and 2) assist in media selection and handling protocols for future TCCR columns by evaluating several CST manufacturer batches as well as samples of one CST batch which had been pretreated using two different methods (field and laboratory methods). The Batch 1A supernate sample and a Tank 10H Batch 2 sample (second TCCR process batch) not previously evaluated by in-cell batch contact testing with CST were re-characterized after several months of storage in the Shielded Cells facility to identify any compositional changes that may have occurred during storage. No solids were visually observed in the waste samples. The data indicated that the carbonate anion concentration for the Batch 1A solution decreased by 32% during storage relative to the as-received sample. The average calcium concentration of the Batch 1A sample was observed to decrease while the calcium concentration of the Batch 2 sample was observed to increase, but the relative standard deviations of the duplicate measurements were high (55-120%) and the results were not conclusive. Only the initial Batch 1A sample contained measurable iron, while iron was below detectable levels during reanalysis of the aged sample. The Batch 2 supernate sample did not contain measurable iron during initial analysis or during reanalysis. Cesium distribution coefficients (Kd), percent removal, and CST loading data for the TCCR production supernate batches (1A and 2) at 35.5 ºC are provided in Table ES-1. Average cesium distribution coefficients of 2,419 and 2,414 mL/g were observed with aged Tank 10H Batch 1A supernate with the R9120-B CST that had been pretreated using abbreviated field and exhaustive laboratory pretreatment methods, respectively. These results indicate that the pretreatment protocol d...

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“…The CST batch experiments were conducted by first wetting the ion exchange material. The CST material was fully converted to the Na + form prior to receiving 12 and was mixed with pH 1.4 H2SO4/69 mM NaNO3 solution in a 1:1.5 ratio (material:solution). The pH was determined by measuring total acid in units of [molarity] and converting by equation pH = -log[H].…”

Section: Batch Experimentsmentioning

confidence: 99%

Removal of High Specific Activity Fission Products from Uranyl Sulfate Waste Solutions

McCann

Poore

Rudisill

2020

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Crystalline Silicotitanate (CST) Ion Exchange Media Performance Evaluations in SRS Average Supernate Simulant and Tank 10H Waste Solution to Support TCCR

Cited by 14 publications

References 0 publications

Preliminary Determination of the Impact of Alkaline Earth Metals on Crystalline Silicotitanate

Preliminary Determination of the Impact of Alkaline Earth Metals on Crystalline Silicotitanate

Characterization and CST Batch Contact Equilibrium Testing of Aged TCCR Tank 10H Batch 1A and 2 Process Supernate Samples

Removal of High Specific Activity Fission Products from Uranyl Sulfate Waste Solutions

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