Fig. 3. Effect of operational conditions on coagulation process for initial AR73 concentration
of 200 mg/L and total COD concentration of 448 mg/L, a)effect of pH on
AR73 and total COD removal (AlCl3 ¼ 100 mg/L, sedimentation time ¼ 30min) and b)
effect AlCl3 dosage on AR73 and total COD removal (pH ¼ 6).