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Separation Science and Technology Volume 56, 2021 - Issue 8
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Water treatment

Elemental characterization of crystalline silicotitanate following Hanford tank waste processing

Emily L. CampbellEnergy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington, USACorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0002-8069-2160View further author information
ORCID Icon,
Amy M. WestesenEnergy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington, USAView further author information
,
Ferdinan C. ColonEnergy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington, USAView further author information
,
Daria BoglaienkoEnergy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington, USAView further author information
,
Tatiana G. LevitskaiaEnergy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington, USAORCID Iconhttps://orcid.org/0000-0002-6217-3105View further author information
ORCID Icon &
Reid A. PetersonEnergy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington, USAORCID Iconhttps://orcid.org/0000-0003-3368-1896View further author information
ORCID Icon
Pages 1457-1465 | Received 20 Apr 2020, Accepted 27 May 2020, Published online: 16 Jun 2020
 
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ABSTRACT

To expedite vitrification of low activity waste at the Hanford Site, a Tank-Side Cesium Removal system, using crystalline silicotitanate (CST) as the ion exchange media, is being evaluated. Laboratory scale testing of Cs removal by CST from Hanford tank waste supernates has been conducted by Pacific Northwest National Laboratory. Selectivity and partitioning of analytes on spent CST, specifically RCRA hazardous metals, selected +2 cations, and transuranic elements, were characterized through the complete digestion of CST. The CST was shown to adsorb a relevant fraction of Ca, Cd, Pb, Sr, U, Pu, Np, Am, and potentially Fe by IX and/or other mechanisms.

Additional information

Funding

This work was supported by the Washington River Protection Solutions.

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