Huangzhao Wei

A recycling method of sewage sludge was investigated to prepare catalysts with desired shape in catalytic wet peroxide oxidation (CWPO). The sludge derived carbon (SC) was first modified with HNO3 solutions under different conditions, where only the ones modified at or below 0oC could remain as column shape instead of corroding into powder. The prepared samples were then tested in CWPO reaction using m-cresol as target pollutant.

As one of the key component of waste disposal of conventional water treatment processes, (NH4)2SO4 (NH3-N concentration = 4390 mg/L, pH = 5.3) was selected as the model compound. The effectiveness of various heterogeneous catalysts was evaluated by catalytic wet air oxidation (CWAO) in batch reactors. Then the activity of NH3-N decomposition has been compared systematically as regards the loading amount of noble metal, reaction conditions and the concentration of substrate in continuous reactors.