Oxidation of nonylphenol in water using O3

In this study, ozone (O) was applied to oxidize nonylphenol (NP) and nonylphnol ethoxylates (NPEOs). Both oxidation performance and kinetics were evaluated under different operating conditions created by varying O-3 doses,solution pHs or molar ratios of H2O2/O-3. This study demonstrates that at pH 7, more than 90% NP (initial NP concentration: 0.51 mg/L) can be removed by 4 mg/L O-3. In all pH range (5-9), NP was also effectively oxidized. However, the amount of NP destructed by O-3 in the ID phase (instantaneous O-3 demand during 30 sec) was mare significant at higher pH. The NP destruction in the ID30sec phase was also significantly increased when H2O2 was applied along with O-3. O-3 was also found to be very effective in oxidizing NPEOs.