Preconceptual design of a salt splitting process using ceramic membranes
- Pacific Northwest National Lab., Richland, WA (United States)
- Ceramatec, Inc., Salt Lake City, UT (United States)
Inorganic ceramic membranes for salt splitting of radioactively contaminated sodium salt solutions are being developed for treating U. S. Department of Energy tank wastes. The process consists of electrochemical separation of sodium ions from the salt solution using sodium (Na) Super Ion Conductors (NaSICON) membranes. The primary NaSICON compositions being investigated are based on rare- earth ions (RE-NaSICON). Potential applications include: caustic recycling for sludge leaching, regenerating ion exchange resins, inhibiting corrosion in carbon-steel tanks, or retrieving tank wastes; reducing the volume of low-level wastes volume to be disposed of; adjusting pH and reducing competing cations to enhance cesium ion exchange processes; reducing sodium in high-level-waste sludges; and removing sodium from acidic wastes to facilitate calcining. These applications encompass wastes stored at the Hanford, Savannah River, and Idaho National Engineering Laboratory sites. The overall project objective is to supply a salt splitting process unit that impacts the waste treatment and disposal flowsheets and meets user requirements. The potential flowsheet impacts include improving the efficiency of the waste pretreatment processes, reducing volume, and increasing the quality of the final waste disposal forms. Meeting user requirements implies developing the technology to the point where it is available as standard equipment with predictable and reliable performance. This report presents two preconceptual designs for a full-scale salt splitting process based on the RE-NaSICON membranes to distinguish critical items for testing and to provide a vision that site users can evaluate.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE Office of Environmental Restoration and Waste Management, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 454004
- Report Number(s):
- PNNL-11454; ON: DE97051516; TRN: 97:006447
- Resource Relation:
- Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
40 CHEMISTRY
MEMBRANES
DESIGN
SALTS
SEPARATION PROCESSES
HIGH-LEVEL RADIOACTIVE WASTES
RADIOACTIVE WASTE PROCESSING
LOW-LEVEL RADIOACTIVE WASTES
SODIUM
ELECTROCHEMICAL CELLS
SOLUTIONS
RARE EARTHS
SLUDGES
ION EXCHANGE MATERIALS
TANKS
PH VALUE
REMOVAL
HANFORD RESERVATION
SAVANNAH RIVER PLANT
IDAHO NATIONAL ENGINEERING LABORATORY
SEPARATION EQUIPMENT
TECHNOLOGY UTILIZATION
ELECTROCHEMISTRY