Maryam Rezaie - Chemical Engineering Department, Amirkabir University, No. ۴۲۴, Hafez Ave., PO Box ۱۵۸۷۵-۴۴۱۳, Tehran,
Ashraf Shafaei - National Petrochemical Company, Research and Technology Co., No. ۱۲, Sarv Alley, Shirazi South Street,
Farbod sharif - Chemical Engineering Department, Amirkabir University, No. ۴۲۴, Hafez Ave., PO Box ۱۵۸۷۵-۴۴۱۳, Tehran,

In this paper Central Composite Design (CCD) technique was used to investigate the effects of different operating parameters such as applied electrical current, electrolyte concentration (NaCl) and electrolysis time on the removal of manganese (Mn) by the electrocoagulation (EC) process.The optimum conditions for maximizing of removal efficiency were founded as 0.49 A, 21.5 mM and 47 min for applied electrical current, electrolyte concentration and electrolysis time, respectively. The influence of these three independent variables on the Mn removal was evaluatedusing a second-order polynomial multiple regression model. Analysis of variance (ANOVA)showed a high coefficient of determination (R2) value of (0.9853), thus ensuring a satisfactory adjustment of the second-order regression model with the experimental data.

Manganese Removal, Electrocoagulation, Central Composite Design