Tc-99 Ion Exchange Resin Testing

Valenta, Michelle M.; Parker, Kent E.; Pierce, Eric M.

doi:10.2172/1000822

Cited by 5 publications

(4 citation statements)

References 19 publications

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“…It is highly water-soluble and mobile, and presents challenges for its sequestration (Icenhower et al, 2010;Meena and Arai, 2017). Previous methodologies for removal of TcO 4 − such as ion-exchange resins, layered double hydroxides, granular activated carbon, and organoclay materials have been employed with limited TcO 4 − loading capacities from aqueous media (Daniels et al, 2019;Gu et al, 2000;Li et al, 2019;Valenta et al, 2010). An alternative approach for TcO 4 − immobilization is the use of reducing agents (e.g., zero-valent iron, iron sulfides, stannous chloride, and reducing bacteria) (Darab et al, 2007;McBeth et al, 2011;Pierce et al, 2010;Plymale et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Anion-exchanged and quaternary ammonium functionalized MIL-101-Cr metal-organic framework (MOF) for ReO4−/TcO4− sequestration from groundwater

Shustova

Martin

et al. 2020

Journal of Environmental Radioactivity

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There are few effective technologies for the sequestration of highly water-soluble pertechnetate (TcO 4 − ) from contaminated water despite the urgency of environmental and public health concerns. In this work, anion exchanged and cetyltrimethylammonium bromide (CTAB) functionalized MIL-101-Cr-NO 3 were investigated for perrhenate (ReO 4 − ), a surrogate of TcO 4 − , sequestration from artificial groundwater. Cl − , I − , and CF 3 SO 3 − exchanged MIL-101-Cr proved more effective at ReO 4 − removal than the parent MIL-101-Cr-F. Compared to the parent framework, CTAB functionalized MIL-101-Cr-NO 3 increased ReO 4removal capacity from 39 to 2 139 mg/g, improved the reaction kinetics from ~30 to < 10 minutes to reach full adsorption capacity and the selectivity for ReO 4 − over competing NO 3 − , CO 3 2− , SO 4 2− , and Cl − . Spectroscopic data indicated that the chemical speciation of Re in the exchanged MIL-101-Cr remained ReO 4 − , indicating synergistic sequestration through both anion exchange and non-ion exchange binding with the positively charged ligand of CTAB. These studies foreshadow potential applications of MOFs for the remediation of 99 TcO 4 − from contaminated environments.

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Section: Introductionmentioning

confidence: 99%

Anion-exchanged and quaternary ammonium functionalized MIL-101-Cr metal-organic framework (MOF) for ReO4−/TcO4− sequestration from groundwater

Shustova

Martin

et al. 2020

Journal of Environmental Radioactivity

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“…SRNL (Langton 2016) has recently provided information on the design and evaluation of cementitious waste forms. Previously, Pacific Northwest National Laboratory (PNNL) also developed reports (Pierce et al 2010 andValenta et al 2010) that described potential options for stabilization of SSW. This report supplements information provided in the SRNL and PNNL reports with some recent information and a focus on practices that are being or have been deployed.…”

Section: List Of Acronymsmentioning

confidence: 99%

“…Two PNNL reports issued in 2010 (Pierce et al 2010 andValenta et al 2010) included a brief discussion of common practices for management of ion-exchange resins. The two reports indicated that "the Class C dewatered spent resins within HICs are placed within concrete boxes to provide structural support after burial" (i.e., no stabilization within the HIC or concrete boxes).…”

Section: Ion Exchange Resinsmentioning

confidence: 99%

“…Examples were provided from the Czech Republic considering a variety of cementitious and polymer based media for stabilization of spent resins. Valenta et al (2010) and Pierce et al (2010) described the use of "a new type of cement, ASC, with higher aluminum and sulfur oxide content, less silicon and calcium oxides, and a mixture of zeolites" for resin solidification in China. It was noted in the two reports that the zeolite helps in sequestering radionuclides like Cs-137 that desorb from the resins during cement hydration reactions.…”

Section: Ion Exchange Resinsmentioning

confidence: 99%

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Examples of Disposition Alternatives for WTP Solid Secondary Waste

Seitz

2018

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The Hanford Waste Treatment and Immobilization Plant is planned to produce a variety of solid secondary wastes that will require disposal at the Integrated Disposal Facility on the Hanford Site. Solid secondary wastes include a variety of waste streams that are a result of waste treatment and processing activities. Four of these solid secondary wastes have been identified for more detailed consideration to support the performance assessment for the Integrated Disposal Facility:Baseline waste forms and disposal configurations have been established for these waste streams and served as the basis for the 2017 Integrated Disposal Facility performance assessment. Initial indications are that the waste forms will be sufficient to meet the performance objectives in DOE Manual 435.1-1 for the assumed waste inventories.Savannah River National Laboratory is providing technical support to Washington River Protection Solutions to address solid secondary wastes. A testing program is underway to obtain material properties for the baseline waste forms to confirm assumptions that were made for the Integrated Disposal Facility performance assessment. The project is also considering waste form development and qualification, including identification of potential alternatives to the baseline waste form assumptions to optimize the overall waste management strategy or provide improved performance, if waste stream assumptions change in the future. This report includes a high-level overview of potential cradle-to-grave operational considerations and examples of waste form, container and disposal alternatives, if there is a need to seek alternatives to the baseline assumptions. Cradle-to-grave waste management considerations that could offer areas for

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