Abstract
An application of ultraviolet ray (UV) irradiation for the decomposition of oxalate in low-level liquid waste's (LLLW's) including transuranium nuclide was investigated. The decomposition properties of oxalate are studied in various simulated LLLW's which basically contain U(VI) and 3M NaNO3. Batch experiments have revealed that the decomposition rates were increased with a decrease in the concentration of HNO3 in the sample solutions. It has been also found that U(VI) in LLLW's enhanced the decomposition, and that no decomposition was observed in a basic solution containing Na2CO3. An optimum solution condition to decompose oxalate in LLLW's is expected to be 0.05M HNO3. UV was also irradiated in solutions containing 3M NaNO3 without U(VI) and HNO2 has been found to be a decomposing species of oxalate. UV irradiation will be a promising method for the decomposition of oxalate in LLLW's.
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