Abstract: A supercritical water oxidation (SCWO)equipment of batch-type was used to study the treatment of anion resin water suspension under supercritical conditions. The effects of reaction temperature, reaction pressure, reaction time, and oxidation coefficient on the removal rate of COD were investigated experimentally. At the same time, the effects of catalyst, reaction pressure and reaction temperature on ammonia removal rate were explored. Through an orthogonal experiment, the most significant factors influencing the reaction system are ranked as follows: reaction temperature>reaction pressure>reaction time>oxidation coefficient. The experiment results show that the removal rate of COD for anion resin is 99.65% under the conditions of reaction temperature of 540 ℃, reaction pressure of 26 MPa, reaction time of 8 min, and oxidation coefficient of 3. The content of NH₃-N in anion resin is high and difficult to be removed, so catalysts CuSO₄, MnO₂, and CeO₂ were added, and the catalytic effect was ranked as CuSO₄>CeO₂>MnO₂. The maximum removal rate of NH₃-N was 96.53%.

Key words: supercritical water oxidation, orthogonal experiment, anion resin, COD, NH₃-N