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This study was carried out to evaluate the pollutant removal efficiencies of the advanced drinking water treatment using ozonation. for raw water, Nakdong River was used. By conducting batch ozonation test, the following results were obtained. when ozone dosage of 5mg/was used, preozonation of raw water reduced turbidity, KMnOconsumption, DOC(dissolved organic carbon), UV254 absorbance, THMFP(trihalomethane formation potential) as much as 3.9NTU, 5.5mg/, 1.15mg/, 0.112 and 0.065mg/, respectively. In case of postozonation of sand filtered water, water quality was also improved with decrease in turbidity, KMnOconsumption, DOC, UV254 absorbance and THMFP at the amount of 0.08NTU, 2.6mg/, 0.88mg/, 0.042 and 0.018mg/, respectively. On the other hand, contents of dissolved oxygen increased at the level of 1.3mg/ after preozonation process and 1.0mg/ after postozonation process. The effect of ozone dosage was higher than that of its contact time for the removal of the pollutants.
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