The higher the dosage of PAC, the higher
was the removal ratio. The lowest residual DOC concentration of
4.5 mg-C/L, which is lower than the water quality standards for
drinking water in Indonesia, was obtained with 70 mg/L of PAC. The
sedimentation velocity in this method was also high and achieved
92.7% of HA removal in 5 min. It indicated that CaCO3 shortens the
settling time after the coagulation process. The SV produced after