Cesium Ion Exchange Using Spherical Resorcinol-Formaldehyde Resin in Support of Waste Qualification Testing for LAWPS

Fiskum, Sandra K.; Smoot, Margaret R.; Peterson, Reid A.; Colburn, Heather A.; Allred, Jarrod R.

doi:10.2172/1508858

Cited by 3 publications

(16 citation statements)

References 4 publications

(8 reference statements)

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“…The SRF ion exchange resin (Spheromers ® RF 380) was provided by Microbeads AS, Skedsmokorset, Norway, batch number 1F-370/1392, and was manufactured in August 2011. A full description of the resin retrieval and pretreatment was previously provided by Fiskum et al (2017).…”

Section: Srf Resinmentioning

confidence: 99%

“…The SRF resin was pretreated according to established protocol. 2 The SRF resin loaded in the column assembly was exposed to a process cycle before use with the AP-105DF as previously described (Fiskum et al 2017). This process cycle used a simple simulant (Russell et al 2017) spiked with 60 µg/mL Cs and tracer 0.1 µCi/mL 137 Cs.…”

Section: Srf Resinmentioning

confidence: 99%

“…As previously reported (Fiskum et al 2017), multiple samples (32 each at nominally 250 mL) were collected at four different depths (91 in., 172 in., 253 in., and 334 in. ) from the AP-105 Hanford tank.…”

Section: Ap-105 Tank Wastementioning

confidence: 99%

“…The ion exchange process system has been previously described (Fiskum et al 2017); a system schematic for processing downflow lead column to lag column is reproduced in Figure 2.1. The quick disconnect valves were realigned to alter the fluid flow path downflow from lag column to lead column.…”

Section: Ion Exchange Process Testingmentioning

confidence: 99%

“…Other attributes of the ion exchange system were scaled to be generally prototypic of the LAWPS system at the time of this work. The ion exchange system was previously described by Fiskum et al (2017).…”

Section: Introductionmentioning

confidence: 99%

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Multi-Cycle Cesium Ion Exchange Testing Using Spherical Resorcinol-Formaldehyde Resin with Diluted Hanford Tank Waste 241-AP-105

Fiskum

Allred

Colburn

et al. 2018

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Executive SummaryWashington River Protection Solutions requested that at least 4 L of Hanford tank waste collected from tank 241-AP-105 and diluted to approximately 5.6 M Na (AP-105DF) be prepared for use in vitrification studies. Cesium removal was required to meet this objective and the waste pretreatment platform, established at Pacific Northwest National Laboratory, was used to create the vitrification feed. The Test Platform mimicked the Low-Activity Waste Pretreatment System (LAWPS) facility planned to pretreat Hanford tank waste supernate by removing solids in a cross flow filter apparatus and processing the supernate through ion exchange columns to remove cesium. At the time of testing, the ion exchange media was targeted to be spherical resorcinol-formaldehyde (SRF) resin. 1 The SRF resin has been tested with a wide array of simulants and process scales, but column performance testing with actual tank waste had been somewhat limited to two Hanford tank wastes (AP-101 and AN-102) in up to two process cycles. This report describes testing conducted in a total of six load elute cycles with the AP-105DF tank waste. The column system was first tested with simulant and was previously described 2,3 ; this report describes the six process cycle results with the AP-105DF tank waste.Column testing was conducted on SRF resin provided by Microbeads AS (Skedsmokorset, Norway, batch number 1F-370/1392), which was manufactured in August 2011. The column testing was prototypic to the intended LAWPS operations in a lead-lag column format, albeit on a small-scale basis with 10-mL resin beds. In this configuration, neither the length-to-diameter ratio nor the superficial flow velocity matched the full-scale design. In this process, the feed was directed downflow through the lead column and then through the lag column. Loading continued until the lag column reached 10% of the Hanford Tank Waste Treatment and Immobilization Plant contract limit for receiving supernatant waste for vitrification (a function of the Na and 137 Cs concentrations). As a result of this process condition, the lead column was nearly saturated with Cs. After loading, the feed was displaced with 0.1 M NaOH, and then the columns were rinsed with water in a downflow lead-to-lag configuration. Elution was conducted downflow from the lag to the lead column with 0.45 M HNO 3 followed by a water rinse. The resin was returned to the Na-form by processing 1 M NaOH downflow from the lag to the lead column, which deviated from the intended LAWPS process operation where the regeneration would occur in upflow to fluidize the resin beds. Variations to the feed flowrates, elution volumes, and elution flowrates were implemented to evaluate effects on the Cs load behavior and Cs leakage to the next process cycle.Cs load and elution profiles were generated. From the load profile, the number of bed volumes (BVs) processed to reach 50% breakthrough on the lead column was determined along with the number of BVs processed before reaching 10% of the contract limit on the l...

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Section: Srf Resinmentioning

confidence: 99%

Section: Srf Resinmentioning

confidence: 99%

Section: Ap-105 Tank Wastementioning

confidence: 99%

Section: Ion Exchange Process Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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