The selective removal of {sup 90}Sr and {sup 137}Cs from liquid low-level waste at Oak Ridge National Laboratory

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Methods are being developed for the selective removal of the two principal radioactive contaminants, {sup 90}Sr and {sup 137}Cs, from liquid low-level waste generated and/or stored at Oak Ridge National Laboratory. These methods are to be used in a future centralized treatment facility at ORNL. Removal of {sup 90}Sr in the proposed treatment flashed is based on coprecipitation from strongly alkaline waste by adding stable strontium to the waste solution. Ferric sulfate, added with the stable strontium, improves the {sup 90}Sr removal and aids in the flocculation of the strontium carbonate (SrCO{sub 3}) precipitate. After separation of the solids, the ... continued below

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7 p.

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Bostick, D.T.; Arnold, W.D.; Burgess, M.W.; Taylor, P.A. & Kent, T.E. December 31, 1995.

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Methods are being developed for the selective removal of the two principal radioactive contaminants, {sup 90}Sr and {sup 137}Cs, from liquid low-level waste generated and/or stored at Oak Ridge National Laboratory. These methods are to be used in a future centralized treatment facility at ORNL. Removal of {sup 90}Sr in the proposed treatment flashed is based on coprecipitation from strongly alkaline waste by adding stable strontium to the waste solution. Ferric sulfate, added with the stable strontium, improves the {sup 90}Sr removal and aids in the flocculation of the strontium carbonate (SrCO{sub 3}) precipitate. After separation of the solids, the resultant supernate is adjusted to pH 8 for the cesium removal treatment. Upon pH adjustment, aluminum originally present in the untreated alkaline waste precipitates and sorbs an additional amount of {sup 90}Sr. Cesium is removed from the neutralized waste by two sequential treatments with potassium cobalt hexacyanoferrate (KCCF) slurry formed by the addition of potassium ferrocyanide (K{sub 4}Fe(CN){sub 6}) and cobalt nitrate (Co(NO{sub 3}){sub 2}) solutions. The cumulative decontamination factors (DFs) for {sup 90}Sr and {sup 137}Cs in benchscale studies are 4900 and 1 x 10{sup 6}, respectively, if high speed centrifugation is used for the liquid/solid separations. Efforts are now underway to evaluate process-scale techniques to perform the liquid/solid separations required for removal of SrCO{sub 3} and {sup 137}Cs-bearing hexacyanoferrate solids from the treated waste solution.

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7 p.

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INIS; OSTI as DE96010577

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  • ESPIP task review meeting, Gaithersburg, MD (United States), 25 Apr 1995 - 26 Apr 1996

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  • Other: DE96010577
  • Report No.: CONF-9504255--1
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 236252
  • Archival Resource Key: ark:/67531/metadc665935

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  • December 31, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Jan. 22, 2016, 4:32 p.m.

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Bostick, D.T.; Arnold, W.D.; Burgess, M.W.; Taylor, P.A. & Kent, T.E. The selective removal of {sup 90}Sr and {sup 137}Cs from liquid low-level waste at Oak Ridge National Laboratory, article, December 31, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc665935/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.