Development of treatment method for analytical waste solutions in STRAD project, 1; Oxidative decomposition of ammonium ion with catalyst

Aihara, Haruka   ; Watanabe, So  ; Nomura, Kazunori  ; Kamiya, Yuichi*

An effective decomposition method of ammonium ion in radioactive analytical waste solutions containing U, Pu and nitric acid has been developed to suppress formation of ammonium nitrate. Oxidative decomposition was examined using ozone gas with existence of cobalt ions as homogeneous catalyst. Reduction in concentration of ammonium ion was achieved by combination of the ozone gas oxidation with the catalyst, and the behavior distinctly depend on compositions of the initial solution.