Treatment of¹⁰⁶Ru Present In Intermediate Level Radioactive Liquid Waste With Nickel Sulphide

Abstract

106 Ru is one of the major radionuclides of concern in the aqueous radioactive waste generated during the reprocessing of the spent fuel. Intermediate level radioactive liquid waste (ILW) stream is generated during reprocessing of spent fuel and is neutralised with alkali to enable it to be stored in carbon steel tank. The waste is initially treated for 137 Cs recovery using a specific resorcinol formaldehyde (RF) ion exchange resin. The effluent stream from the ion exchange treatment process has significant activity due to 106 Ru. The present paper deals with a chemical treatment study for removal of 106 Ru in the effluent using sulphides of cobalt and nickel. The decontamination factor of 250 obtained using NiS (at 2500 ppm concentration of Ni 2þ ) is distinctly better than that obtained using CoS (at 7200 ppm concentration of Co 2þ ).

Evaluation of Nickel Sulphide Prepared by Different Routes for Removal of106Ru from Alkaline Radioactive Liquid Waste

“…An earlier study of co-precipitation of Ru with NiS (25,26) gave good decontamination with respect to Ru. Concentration of 2500 ppm as Ni 2þ and 1326 ppm as S 2À was found to be optimum to give a decontamination factor of about 60À250 for 106 Ru using multiple-step precipitation from a radioactive liquid waste containing high salt.…”

Effect of the synthesis temperature of sodium nonatitanate on batch kinetics of strontium-ion adsorption from aqueous solution

“…The main co-precipitated radionuclides are 90 Sr, 137 Cs, 106 Ru, 60 Co, and alpha emitters (Pu, Am, etc.) (Hamblin and Ensor 2004;Pacary et al 2008;Sonar et al 2009). A selective sorbent is used for each of these species, barium sulfate, for example, is used for the co-precipitation of strontium ions.…”

Functionalized porous glass for the removal and the confinement of ruthenium from radioactive solutions

“…solvent extraction of promethium(III), uranium(VI), plutonium(IV), americium(III), zirconium(IV), ruthenium(III), iron(III) and palladium(II) with a 0022-3115/$ -see front matter Ó 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.jnucmat.2010.02.005 mixture of octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) and tributyl phosphate (TBP) in dodecane [9], ion exchange methods [10,11], co-precipitation methods [12,13], and distillation and precipitation [7,8].…”