ISSN: 0975-8585 March – April 2017 RJPBCS 8(2) Page No. 596 Research Journal of Pharmaceutical, Biological and Chemical Sciences Studies on electrochemical degradation of the azo dye Methyl Orange by anodic oxidation. Kaouthar Oukili*, Ghita Esbai, and Mohammed Loukili. Laboratory of Process, Environment and Renewable Energy, High School of Technology, Sidi Mohamed Ben Abdellah University, Fez, Morocco. ABSTRACT The electrochemical oxidation of a synthetic wastewater containing Methyl Orange was investigated. A series of electrochemical degradation runs was performed in order to assess the effect of the following operating parameters on color removal: applied current (4–5 A), dye concentration (50–200 mg/L), pH (4–11), temperature (25–65 °C) and NaCl concentration (1.5–3.5 g/L). The complete de-colorization was achieved in any experimental conditions indicating that the electrochemical oxidation is a suitable method for treatment of dye wastewaters. Performance was improved at operating conditions of 3.5 g/L NaCl concentration, pH 4, 25°C temperature and 5A current intensity. Degradation of the aromatic rings was demonstrated by the decrease of absorbance at UV region in UV–Vis spectra. The kinetic and energy consumption were also discussed. Keywords: anodic oxidation, Methyl Orange, De-colorization, wastewater treatment. *Corresponding author