We investigated the effect of ozonation and chlorination on the mutagenic activity of humic substances. SOS Chromotest was used for mutagenic test. The mutagenic activity decreased, but couldnotberemoved perfectly. Glyoxal, which is known as the strong mutagenic compound produced by ozonation, was not decomposed at equal amounts of chlorine to the chlorine consumption, but decomposed to 10 % at 5 times. Also, granular activated carbon (GAC) filtration was performed, but it was not effective.

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