Carbon-14 immobilization via the Ba(OH)/sub 2/. 8H/sub 2/O process

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The airborne release of /sup 4/C from varous nuclear facilities has been identified as a potential biohazard due to the long half-life of /sup 14/C (5730 y) and the ease with which it may be assimilated into the biosphere. At ORNL, technology has been developed for the removal and immobilization of this radionuclide. Prior studies have indicated that /sup 14/C will likely exist in the oxidized form as CO/sub 2/ and will contribute slightly to the bulk CO/sub 2/ concentration of the gas stream, which is airlike in nature (approx. 330 ppmv CO/sub 2/). The technology that has been developed ... continued below

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Haag, G.L.; Nehls, J.W. Jr. & Young, G.C. March 1, 1983.

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Description

The airborne release of /sup 4/C from varous nuclear facilities has been identified as a potential biohazard due to the long half-life of /sup 14/C (5730 y) and the ease with which it may be assimilated into the biosphere. At ORNL, technology has been developed for the removal and immobilization of this radionuclide. Prior studies have indicated that /sup 14/C will likely exist in the oxidized form as CO/sub 2/ and will contribute slightly to the bulk CO/sub 2/ concentration of the gas stream, which is airlike in nature (approx. 330 ppmv CO/sub 2/). The technology that has been developed utilizes the CO/sub 2/-Ba(OH)/sub 2/.8H/sub 2/O gas-solid reaction with the mode of gas-solid contacting being a fixed bed. The product, BaCO/sub 3/, possesses excellent thermal and chemical stability, prerequisites for the long-term disposal of nuclear wastes. For optimal process operation, studies have indicated that an operating window of adequate size does exist. When operating within the window, high CO/sub 2/ removal efficiency (effluent concentrations < 100 ppbv), high reactant utilization (> 99%), and an acceptable pressure drop across the bed (3 kPa/m at a superficial velocity of 13 cm/s) are possible. This paper addresses three areas of experimental investigation: (1) microscale studies on 150-mg samples to provide information concerning surface properties, kinetics, and equilibrium vapor pressures; (2) macroscale studies on large fixed beds (4.2 kg of reactant) to determine the effects of humidity, temperature, and gas flow rate upon bed pressure drop and CO/sub 2/ breakthrough; and (3) design, construction, and initial operation of a pilot unit capable of continuously processing a 34-m/sup 3//h (20-ft/sup 3//min) air-based gas stream.

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NTIS, PC A03/MF A01.

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  • Other: DE83009881
  • Report No.: ORNL-5926
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/6410315 | External Link
  • Office of Scientific & Technical Information Report Number: 6410315
  • Archival Resource Key: ark:/67531/metadc1208121

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  • March 1, 1983

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Feb. 21, 2019, 4:36 p.m.

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Haag, G.L.; Nehls, J.W. Jr. & Young, G.C. Carbon-14 immobilization via the Ba(OH)/sub 2/. 8H/sub 2/O process, report, March 1, 1983; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1208121/: accessed August 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.