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Methylene blue simulated wastewater was treated with a UV-H 2 O 2 combined system. Influences of factors such as reaction time, initial pH value and H 2 O 2 dosage were investigated, and the reaction kinetics of the process was explored. Results showed that the degradation of methylene blue happened only in the presence of both conditions: UV irradiation and H 2 O 2 addition. Initial pH and H 2 O 2 dosage had a remarkable influence on the degradation efficiency. Through several groups of univariate experiments, the optimum pH and H 2 O 2 dosage of the photolysis process were found to be 4–5 and 0.165 mL 30% H 2 O 2 per milligram of methylene blue, respectively. The photolysis process was relatively fast at the initial stage and, 20 min later, it was approximately in accordance with the first-order kinetic equation.

Decoloration of methylene blue simulated wastewater using a UV-H2O2 combined system