Evaluation of Effective Catalysts for Treating Ammonia Hydrogen Peroxide Wastewater by Hydrothermal Reaction

Abstract

In this study, 13 types of non-precious metal catalysts, such as Fe, Fe₂O₃, Zn, CuO, MnO₂, V₂O₅, MoO₃, Al₂O₃, NiO, Mg, MgO, CaO, and BaO, were evaluated as catalysts to treat ammonia hydrogen peroxide wastewater, such as basic semiconductor washing water that contains high concentrations nitrogen（NH₄-N）and hydrogen peroxide（H₂O₂）, using the subcritical hydrothermal reaction method. In addition, the optimal reaction conditions using the selected catalysts were determined. MgO was selected as the catalyst, and the removal rates of NH₄-N and H₂O₂ were 32.8％ and 100％ under the conditions of simulated wastewater concentrations of 5,000 and 10,000 ㎎/L, respectively, 0.9 g of MgO, a shaking speed of 110 rpm, reaction temperature of 300℃, and reaction time of 1 h. Thus, we demonstrated that MgO has a comparable catalytic performance to Pt for high-concentration nitrogen removal.