Pre-Treatment of Radioactive Spent Ion Exchange Resin by Fenton Process
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Graphical Abstract
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Abstract
Fenton reagent oxidation experiments were conducted to test its feasibility in pretreatment of radioactive spent ion exchange resin. The effects of reaction conditions such as the dosage of H2O2 and Fe2+, reaction time(t)and reaction temperature(θ)were studied in term of chemical oxygen demand (COD) removal efficiency. The optimum operating conditions determined by the orthogonal experiments are as follows: c0(H2O2)=4.0 mol/L, c0(Fe2+)=20 mmol/L, θ=95 ℃ and t=4 h at pH=2.5. Under optimum operating conditions, approximately 100% decomposition efficiencies can be achieved for three 50 g uraniumcontaining wet resin samples. The COD is reduced from 8.0-10.0 g/L in the initial solution to 0.2-0.3 g/L in the residual solution . At the same time, the concentration of uranium in the tail-gas absorption solution don’t remarkably increase. The study results show that the pre-treatment of industrially generated radioactive spent ion exchange resin by Fenton’s reagent can entail very effective degradation of the resin.
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