Decontamination of radioactive concrete using electrokinetic technology
The experimental results of the electrokinetic decontamination with 0.01 M of nitric acid were that the cesium ions were removed by up to 52% from the concrete after 15 days, also the cobalt ions were only removed by up to 0.7%. The concrete should be washed with H2SO4 as a pretreatment before electrokintic decontamination to lower its pH below 4.0. The removal efficiencies of 60Co and 137Cs by nitric acid were increased by 3.1 and 2.5% more than those by acetic acid. The larger the particle size of the concrete, the more the removal efficiencies of 60Co and 137Cs were increased. Also, the removal efficiencies of 60Co and 137Cs by the application of an electric current of 20 mA/cm2 were increased by 1.6 and 3.9% more than those by the application of 10 mA/cm2. The removal efficiencies of 60Co and 137Cs from the radioactive concrete of 1,940 Bq/kg were 99.8 and 92.3% by electrokinetic decontamination after pretreatment by the application of an electric current of 20 mA/cm2 for 25 days.
KeywordsElectrokinetic decontamination Concrete Cobalt Cesium Nitric acid
This work was supported by Nuclear Research & Development Program of the Korea science and engineering foundation (KOSEF) grant funded by the Korean government (MEST).
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