This research was performed to evaluate the effective of coagulation process according to the raw water quality. After dosing two type of coagulant, the turbidity of the upper part of the sample was 0.20~0.40NTU with PAHCS and 0.21~0.46NTU with PAC. And the optimal coagulant dosing rate was 1-2mg Al/L with the raw water turbidity condition under 3.7NTU. Al concentration in the effluent from the modeling of filtration basin was less than that in tap water and the recovery of Al from experiment was about 85.4~92.7% compared with total balance of Al. Coagulation efficiency of PAHCS was higher than PAC correlated to the total balance of Al.
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