Treatment and Reaction Kinetic Analysis of Waste Solvent From Nuclear Power Plants by Supercritical Water Oxidation

Supercritical water oxidation(SCWO) is applied to treat waste solvent from nuclear power plants. The effects of peroxide coefficient, reaction time, temperature and pressure on the treatment of waste solvent from nuclear power plants are investigated. The result shows the equipment has the best treatment effect under the conditions of peroxide coefficient 1.2, reaction time 45 s, temperature 450 ℃, pressure 22.5 MPa, and the COD degradation rate is up to 99.8%. The kinetic laws of supercritical water oxidation reaction of waste solvent from nuclear power plants are discussed. At 22.5 MPa, the value of activation energy is （24.64±1.25） kJ/mol, the frequency factor is 2.38 s^-1. The deviation between calculation and experimental values is within ±7%.