Journal of Water Reuse and Desalination Vol 1 No 1 pp 45–51 © IWA Publishing 2011 doi:10.2166/wrd.2011.019

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

L. V. Jian-xiao, Cui Ying, Xie Guo-hong, Zhou Ling-yun and Wang Su-fen

Methylene blue simulated wastewater was treated with a UV-H₂O₂ combined system. Influences of factors such as reaction time, initial pH value and H₂O₂ 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 H₂O₂ addition. Initial pH and H₂O₂ dosage had a remarkable influence on the degradation efficiency. Through several groups of univariate experiments, the optimum pH and H₂O₂ dosage of the photolysis process were found to be 4–5 and 0.165 mL 30% H₂O₂ 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.

Keywords: advanced oxidation process; kinetics; photolysis; reactive dye

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