Removal of technetium-99 from simulated Oak Ridge National Laboratory Newly-Generated Liquid Low-Level Waste

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We report laboratory investigations on treatment options for the removal of the radionuclide {sup 99}{Tc} (as the pertechnetate anion, {Tc}O{sub 4}{sup {minus}}) from simulated Oak Ridge National Laboratory Newly Generated Liquid Low-Level Waste. The waste stimulant is alkaline (pH 12-13), containing sodium carbonate ({approximately}0.10 mot/L) and sodium hydroxide ({approximately} 0.125 mol/L), plus a modest concentration of sodium nitrate ({approximately}0.06 mol/L). Several organic resin anion exchange media were tested; Dowex{trademark} 1-X-8 and Reillex{trademark} HPQ resins were notably effective (with equilibrium distribution coefficients {approximately}2,000 mL/g, as-received basis). We also tested steel wool as a reagent to chemically reduce and sorb {sup 99}Tc. ... continued below

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24 p.

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Beck, D.E.; Osborne, P.E.; Bunch, D.H.; Fellows, R.L.; Sellers, G.F.; Shoemaker, J.L. et al. June 1, 1995.

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Description

We report laboratory investigations on treatment options for the removal of the radionuclide {sup 99}{Tc} (as the pertechnetate anion, {Tc}O{sub 4}{sup {minus}}) from simulated Oak Ridge National Laboratory Newly Generated Liquid Low-Level Waste. The waste stimulant is alkaline (pH 12-13), containing sodium carbonate ({approximately}0.10 mot/L) and sodium hydroxide ({approximately} 0.125 mol/L), plus a modest concentration of sodium nitrate ({approximately}0.06 mol/L). Several organic resin anion exchange media were tested; Dowex{trademark} 1-X-8 and Reillex{trademark} HPQ resins were notably effective (with equilibrium distribution coefficients {approximately}2,000 mL/g, as-received basis). We also tested steel wool as a reagent to chemically reduce and sorb {sup 99}Tc. At pH values above {approximately}10, the iron surface was passivated and became ineffective as a reagent for technetium; however, as the test solution pH value was adjusted to near-neutrality (e.g., pH 8-9), the steel was noted to be more effective than the organic resins tested. In dynamic flow conditions, steel wool packed in a column was noted to continuously leak {approximately}1--3% of the amount of {sup 99}{Tc} activity in the feed solution, although no additional increase in eluent activity was noted for the duration of the testing ({approximately}1200 bed volumes of {approximately}0.11 mg/L {sup 99}{Tc} flowed at a rate equivalent to {approximately}0.5 gal/min/ft{sup 2} of column cross sectional area). Although no breakthrough was noted (other than the 1--3 % continuous ``bleed`` noted previously) during the column operation ({approximately} 2 weeks), the steel in the column was deteriorated, causing plugging and erratic flow toward the end of the testing interval.

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24 p.

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INIS; OSTI as DE95014419

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  • Other Information: PBD: Jun 1995

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  • Other: DE95014419
  • Report No.: K/TCD--1141
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/95161 | External Link
  • Office of Scientific & Technical Information Report Number: 95161
  • Archival Resource Key: ark:/67531/metadc794644

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  • June 1, 1995

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • Feb. 1, 2016, 8:13 p.m.

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Beck, D.E.; Osborne, P.E.; Bunch, D.H.; Fellows, R.L.; Sellers, G.F.; Shoemaker, J.L. et al. Removal of technetium-99 from simulated Oak Ridge National Laboratory Newly-Generated Liquid Low-Level Waste, report, June 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc794644/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.