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Wet air oxidation process is one of the advanced oxidation processes for reducing toxic organic matter in industrial wastewater and solid waste leachate treatment. The purpose of this study is to use a catalytic oxidation of hydrogen peroxide for improving the removal efficiency of the organic matter. In this study, the effect of operational parameters such as temperature (100–300 °C), residence time (30-90 min) and hydrogen peroxide volume (1-5 mL-1) in the pressure 10 bars with combination of absorption process on GAC, PAC, PAC/Cl2, and GAC/Fe were considered. The air as main oxidant and various volumes of H2O2 were used to improve the organic material oxidation. The removal efficiency of GAC, PAC, PAC/Cl2 at temperature 300 °C, and activated carbon concentration 2 g/l were 43.4%, 38.9%, and 33.6% respectively. COD removal efficiency in the GAC adsorption process in 3 g/L activated carbon was, 45.2%, and GAC/Fe catalytic process was increase to 64.7%. The GAC/Fe catalyst process had higher efficiency than other absorbents for the organic matter oxidation in leachate.