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The characteristics of assimilable organic carbon(AOC) concentration by changing the reaction conditions of ozonation was investigated using a model raw water containing humic substances and drinking water resource. To determine the influence of the reaction pH, pH was adjusted to the desired value from 6 to 9 by addition of either sodium hydroxide or hydrochloric acid. When ozone dosage was low, AOC concentration of model raw water and drinking water resource tended to increase, which was associated with AOC-NOX increase, respectively. The maximum AOC concentration was detected when the residual ozone begin to be measured. After that, with ozone dose increasing, AOC concentration decreased with increase the residual ozone. Therefore, it could be possible to expect the variation of AOC concentration by ozonation if the ozone dosage and residual ozone concentration are monitoring. In case of the ozonation by changing pH(from 6 to 9) with 2 and 3mg/L of ozone dosage, the AOC concentration at pH 6 and pH 7 was almost same at each ozone dose, respectively. However, the AOC concentration for pH 8 than pH 6 and pH 7 increased while that for pH 9 decreased rapidly.
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