The dairy industry is among the most contaminated of the food industries. Dairy industry wastewater contains a high organic load and chemical oxygen demand (COD). In recent years, due to the development of the dairy industry, the administration of dairy effluents has become the main problem since dairy effluents can be a dangerous and significant threat, especially to the aqueous environment. Therefore, there is an important need to improve the management and remediation of dairy efflu- ents in order to ensure the economic viability of this major agricultural industry and to decrease environmental problems. Several works focused on the remediation of dairy wastewater. In this study, the effect of the electro-Fenton process on COD and turbidity removal from dairy wastewater was studied. The electro-Fenton process was optimized for four independent variables (pH, reaction time, volume of H 2 O 2 , and H 2 O 2 /Fe 2+ (the molar ratio)). Moreover, the response surface methodol- ogy was utilized to design experiments and determine optimum operating conditions. Under optimal conditions (pH = 5.95, reaction time = 60 min, volume of H 2 O 2 = 1.5 ml and the molar ratio of H 2 O 2 /Fe 2+ = 1.8), the removal efficiency of COD was 95.8%. Also under optimal conditions (pH = 6.37, reaction time = 60 min, volume of H 2 O 2 = 1.5 ml and the molar ratio of H 2 O 2 /Fe 2+ = 2.09), the removal efficiency of turbidity was 97.2%

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