Study on the Influence of Key Process Parameters on the Degradation of Waste Resin by Supercritical Water Oxidation
In this paper,anion and cation exchange resins as the typical radioactive waste in nuclear power plants are used as degradation substrates.By regulating reaction temperature,oxidation coefficient,residence time,material concentration and reaction alkalinity,the effects of different key process parameters on the degradation of organic matter in supercritical water oxidation process are explored.The results show that the key process parameters,such as reaction temperature,oxidation coefficient and residence time,are positively correlated with the degradation rate of the two resin organic compounds.With the increase of the key process parameters,the degradation rate of the resin organic compounds increases continuously.At the temperature of 480 ℃ and above,the COD removal rate of the two resins can be basically stable.The oxidation coefficient of the two resins should be greater than 130％due to the mass transfer of resin solid particles in the early stage of reaction.The cation exchange resin will generate strong acidic substances during the reaction process,resulting in the overall reaction rate slowing down.After adding NaOH,the removal efficiency of cation exchange resin is significantly improved.
SCWOradioactive waste ion exchange resinkey process parametersdegradation
万方数据
维普
