Removal of technetium, carbon tetrachloride, and metals from DOE properties. 1998 annual progress report

Technical Report · Mon Jun 01 00:00:00 EDT 1998

DOI:https://doi.org/10.2172/13750· OSTI ID:13750

Mallouk, T E; Darab, J G; Ponder, S M

'The objective of the project is to develop and characterize supported reducing agents, and solid waste forms derived from them, which will be effective in the removal of transition metal ions, chlorinated organic molecules, and technetium from aqueous mixed wastes. This work follows the discovery that a nanoscale form of zero-valent iron, dispersed on high surface area supports, reduces metal ions (chromium, mercury, and lead) and rhenium (as a surrogate for technetium) to insoluble forms much faster than does unsupported iron. The scientific goals of the project are to better understand the mechanism of the reduction process, to develop supports that are compatible with a variety of mixed waste compositions, and to develop surface modifiers for the supported iron aggregates that will optimize their selectivity for the contaminants of interest. The support composition is of particular interest in the case of technetium (Tc) separation and stabilization in the Hanford tank wastes. While it is expected that pertechnetate will be reduced insoluble TcO{sub 2} , the support material must be compatible with the vitrification process used in the final waste disposition. The surface modifications are also a focal point for Hanford applications because of the complex and variable makeup of the tank wastes. This report summarizes progress in the first 8 months of a 3-year collaborative project involving Penn State and Pacific Northwest National Laboratory (PNNL).'

• Research Organization: Pennsylvania State Univ., University Park, PA (US)
• Sponsoring Organization: USDOE Office of Environmental Management (EM), Office of Science and Risk Policy
• OSTI ID: 13750
• Report Number(s): EMSP-60017-98; ON: DE00013750
• Country of Publication: United States
• Language: English

Related Subjects

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Progress Report
Technetium
Chemical Reactions
Separation Processes
High-Level Radioactive Wastes
Radioactive Wastes
Chemical Wastes
Remedial Action
PROGRESS REPORT
TECHNETIUM
CHEMICAL REACTIONS
SEPARATION PROCESSES
HIGH-LEVEL RADIOACTIVE WASTES
RADIOACTIVE WASTES
CHEMICAL WASTES
REMEDIAL ACTION