Control of HAAs Formation Potential of Filtered Water Using Catalytic Ozonation with Supported Cerium Oxide

The influence of catalytic ozonation with supported cerium oxide(CeO2/Al2O3/O3) in a continuous flow reactor on haloacetic acids formation potential(HAAsFP) of filtered water was investigated.The results indicate that CeO2/Al2O3/O3 with surface complexation of Ce(Ⅳ) as catalytic mechanism can effectively control HAAsFP in the continuous flow reactor.HAAsFP of the filtered water after catalytic ozonation is 45.3% lower than that after ozonation alone.The higher DOC removal and higher reactivity of hydroxyl radical during complexation catalysis may be the main reason for effectively controlling HAAsFP by CeO2/Al2O3/O3.The variation of HAAsFP of the filtered water after catalytic ozonation were further investigated under different conditions.CeO2/Al2O3/O3 has a significant advantage in controlling HAAsFP under the conditions of ozone dosage of 0.7 to 5.0 mg/L,bromide of 0 to 3 mg/L and contact time of 3.3 to 9.8 min.The optimum conditions in practice are recommended: ozone dosage of O3/DOC≈1 and a relatively long contact time.