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Three coagulants, alum sulfate(alum), poly aluminum chloride(PAC) and poly aluminum silicate chloride (PASC), were used to remove low to high turbidity and TOC in surface and ground blended water. Laboratory experiments and pilot plant experiments were carried out to evaluate the optimal coagulant and its dosage. To determine the optimized coagulant and its dosage, the turbidity, TOC and pH were measured. The experimental resultsshowed the best removal performance using PASC. The optimal dosage of PASC between 3-20 NTU was found to be 15 mg/L in the jar test. In the pilot test, a 15 mg/L PASC dosage was applied and resulted in the efficient removal of turbidity and TOC between 3.6-27 NTU. The removal efficiency of PASC increased with increasing turbidity andTOC. Key Words : Coagulation, TOC, Turbidity, PASC, pH   2014  “(KW-14-SWG)”  “(312070-03)”   . * Corresponding Author : Dal-Sik Woo(Korea interfacial Science and Engineering institute)Tel: +82-41-522-5025 email: dswoo7337@hanmail.netReceived October 1, 2014 Accepted March 12, 2015 Revised December 4, 2014Published March 31, 2015

Optimal coagulant and its dosage for turbidity and total organic dissolved carbon removal