Permanganate Oxidation of Defense Waste Processing Facility (DWPF) Recycle Collection Tank (RCT) Simulants – Protocol Runs for Nominal and Chemical Process Cell (CPC) Foamover Conditions

Zamecnik, J.R.; Riley, W. T.; Ramsey, W.G.

doi:10.2172/1561212

Cited by 10 publications

(25 citation statements)

References 6 publications

(6 reference statements)

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“…Additional work is underway to advance the sodium permanganate oxidation process for DWPF implementation. 26 This testing will include processing with prototypic RCT simulant, worst case testing (i.e., a foam-over in the CPC or an entrainment event in the melter), and radioactive waste (or large scale) testing.…”

Section: Discussionmentioning

confidence: 99%

Evaluation Of Chemical Additives For Glycolate Destruction In The Recycle Collection Tank

Howe

et al. 2019

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Savannah River National Laboratory (SRNL) has completed a work scope in support of the Savannah River Remediation (SRR) Nitric-Glycolic flowsheet. Glycolic acid will replace formic acid as a reducing agent in the pre-processing of High-Level Waste sludge performed at the Defense Waste Processing Facility (DWPF). Glycolic acid will perform the same function as formic acid, namely reduction of mercury and adjustment of feed rheology and melter oxidation/reduction potential, while significantly reducing the potential for hydrogen generation in DWPF processing. Development testing has demonstrated glycolic acid virtually eliminates hydrogen production in the pre-processing steps.The Nitric-Glycolic flowsheet significantly improves DWPF's ability to address Savannah River Site's key challenge -the incorporation of effluent received from the Salt Waste Processing Facility (SWPF). SWPF will deliver significant effluent volume to DWPF, resulting in a concurrent increase in DWPF effluent returned to the Concentration, Storage and Transfer Facilities (CSTF). This work scope demonstrates that glycolate can be destroyed under the Nitric-Glycolic flowsheet prior to returning the DWPF recycle stream to CSTF.

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Section: Discussionmentioning

confidence: 99%

Evaluation Of Chemical Additives For Glycolate Destruction In The Recycle Collection Tank

Howe

et al. 2019

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“…The simulant used represent the transfer from the SMECT condensate feed and/or the OGCT onto the RCT with heel [6]. A 50 wt.% hydroxide addition for caustic adjustment prior to addition of permanganate was poured.…”

Section: Simulant For Testingmentioning

confidence: 99%

“…Scoping studies were performed to evaluate sodium permanganate and Fenton's reagent (i.e., iron catalyzed hydrogen peroxide) for destroying the glycolate. From the results of testing, oxidation by sodium permanganate was chosen over Fenton's reagent [6]. SRR requested corrosion testing to evaluate the materials that will be exposed to sodium permanganate, as part of a Technical Task Request (TTR) [7].…”

Section: Introductionmentioning

confidence: 99%

Impact of Permanganate Oxidation of Glycolate on Corrosion of the Defense Waste Processing Facility (DWPF) Recycle Collection Tank (RCT), Transfer-line and Waste Tank Materials of Construction (MoC)

Fuentes

2020

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“…The SRS Defense Waste Processing Facility (DWPF) is currently planning to implement an ambient temperature alkaline permanganate process for the oxidation of glycolate and this proposed approach is based on a similar process (Zamecnik et al 2019;Siegfried et al 2019;Nash and Siegfried 2020).…”

Section: Line 5 -Chemical Destruction Of Organics Using Permanganatementioning

confidence: 99%

Evaluation of Technologies for Enhancing Grout for Immobilizing Hanford Supplemental Low-Activity Waste (SLAW)

Skeen

Langston

McCabe

et al. 2020

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An expert panel consisting of the document authors was assembled by Washington River Protection Solutions, LLC (WRPS) and tasked with (1) identifying technical and regulatory limitations to treating and disposing of grouted low-activity waste (LAW), and (2) with identifying and evaluating a wide range of technical solutions to these limitations. The analysis included technologies to allow inventory management and/or improve retention of iodine, technetium, and nitrate either in the waste packages, or within the Integrated Disposal Facility (IDF), and, technologies to ensure regulated organics are below Resource Conservation and Recovery Act of 1976 (RCRA) Land Disposal Restriction (LDR) levels.The expert panel completed their analysis in three distinct phases. In Phase I, the team reviewed the chemical and physical characteristics of the most recent projected supplemental LAW (SLAW) feed vector along with disposal site waste acceptance criteria and the fiscal year 2019 results from Pacific Northwest National Laboratory that identified the level of improvement that would be needed to meet onsite disposal requirements in the IDF (Asmussen et al. 2019a). The two regulatory constraints targeted for technology solutions by the expert panel were (1) current estimates based on performance assessment fate-andtransport modeling indicate that if the entire quantity of LAW currently designated for supplemental treatment were solidified as a cementitious material, nitrate, 99-Tc, and 129-I could exceed groundwater standards after DOE's time of compliance (1,000 years) but within 10,000 years after IDF closure and (2) LAW may contain RCRA LDR organics at levels that require removal to meet LDR concentration-based limits. It should also be noted that the first issue is only applicable to on-site disposal, not offsite at WCS and is based on calculations that assume either a low-performing grout is used, or high-performance grout does not maintain its performance (SRNL-RP-2018-00687). Asmussen et al. (2019a) estimated that the inventory of grouted SLAW could meet IDF groundwater requirements if the release rate of nitrate, 99-Tc, and 129-I were reduced by a factor of approximately 3.2, 10, and 32, respectively versus baseline formulation performance.In Phase II, an extensive list of technologies and engineering approaches was identified and subjected to an initial assessment by the group. Current knowledge associated with technology maturation needs and constraints to implementation at Hanford were recorded in 13 distinct categories. In the final phase of the process (Phase III), the expert panel selected 7 of the 13 categories for qualitative rating and a series of meetings were held between the expert panel to discuss and rate each technology in each category. All ratings were developed by consensus. After the qualitative rating was complete, a numerical scoring criterion for each category was applied and a composite score for the individual technologies was calculated. An uncertainty score was also developed for each technolo...

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Permanganate Oxidation of Defense Waste Processing Facility (DWPF) Recycle Collection Tank (RCT) Simulants – Protocol Runs for Nominal and Chemical Process Cell (CPC) Foamover Conditions

Cited by 10 publications

References 6 publications

Evaluation Of Chemical Additives For Glycolate Destruction In The Recycle Collection Tank

Evaluation Of Chemical Additives For Glycolate Destruction In The Recycle Collection Tank

Impact of Permanganate Oxidation of Glycolate on Corrosion of the Defense Waste Processing Facility (DWPF) Recycle Collection Tank (RCT), Transfer-line and Waste Tank Materials of Construction (MoC)

Evaluation of Technologies for Enhancing Grout for Immobilizing Hanford Supplemental Low-Activity Waste (SLAW)

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