Run 1st experiment(pH: 7) 2nd experiment(Current density: 83 mA cm-2) 3rd experiment(Contact time 20 min) Electrolysis time (min) Current density (mA cm-2) Contact time (min) pH Current density (mA cm-2) pH 1 10 27 10 4 27 4 2 20 27 20 4 55 4 3 30 27 30 4 83 4 4 10 55 10 7 27 7 5 20 55 20 7 55 7 6 30 55 30 7 83 7 7 10 83 10 9 27 9 8 20 83 20 9 55 9 9 30 83 30 9 83 9

Table 2: Full 32 factorial design of the operating parameters during the electrocoagulation experiments for treatment of olive mill wastewater.