Study on the Mechanism and Kinetics of O3/H2O2 Advanced Oxidation Reaction

Abstract

With the advent of the era of Industry 4.0, the composition of industrial wastewater is complex and toxic, and at the same time, the country and people have higher and higher requirements for the environment, making water pollution prevention and control a lot of attention. The article systematically expounds the reaction mechanism of O3 single oxidation and O3/H2O2 advanced oxidation process, analyzes the superiority of O3/H2O2 process compared with O3 single oxidation, and experimentally explores the effect of O3/H2O2 process on DDNP production wastewater. The orthogonal experiment results show that the primary and secondary relationship of the influencing factors of O3/H2O2 process is pH>reaction time>O3 concentration>H2O2 dosage, the optimal process is pH=9, reaction time 30min, O3 concentration 8.64mg/L, H2O2 dosage 2ml/L, the effluent after treatment reaches the industrial discharge standard. By increasing the acidity and inhibiting the reaction of OH radicals under the condition of pH 3, the reaction order of the characteristic pollutants (nitrophenols) in the direct oxidation of O3 was determined to be first-order, and the rate constant was 0.148 L/moL·min.