The effects of the dissolved organic matter (DOM) on the ozone decay and the di-n-butyl phthalate (DBP) decomposition during ozone/hydrogen peroxide (O3/H2O2) process were investigated (DBP-d4 was used instead of DBP). Four surface waters, two secondary municipal sewage effluents (SMSEfs) and Suwannee river natural organic matter were used as DOM. The ozone decompositions in the DOM solutions were separated by instantaneous ozone consumption and slower ozone decay. The effect of H2O2 addition on the ozone decay was clearly observed at slower ozone decay. Ozone decomposition rate at slower ozone decay increased linearly with H2O2 dose. DBP-d4 was exponentially decreased with ozone consumption. Ozone consumption required to decompose 90% of DBP-d4 ((ΔO3)90%) in SMSEFs was higher than those in surface waters. The (ΔO3)90% per DOC of DOM values were from 22 to 23 μmole/mgC for SMSEFs and from 10 to 17 μmole/mgC for surface waters. The (ΔO3)90% values were correlated to specific ultraviolet absorbance at 254 nm (SUVA254) for surface waters.

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