Control of HAAs Formation Potential Using Supported Goethite-catalyzed Ozonation

Five haloacetic acids formation potentials(HAAsFP) of filtered water after catalytic ozonation with supported ferric hydroxide(FeOOH) were investigated in a continuous flow reactor.HAAsFP of filtered water after catalytic ozonation with supported FeOOH are 33.1% lower than those after ozonation alone.The higher TOC removal rate and higher reactivity of hydroxyl radical may be the main reasons for the further control of HAAsFP by the catalytic ozonation with supported FeOOH.The effects of bromide concentration,ozone dosage and contact time on the HAAsFP after catalytic ozonation were investigated.The catalytic ozonation shows a significant advantage over ozonation alone in controlling HAAsFP under different conditions.High bromide concentration results in the predominance of brominated HAAs,and more significant reduction of HAAsFP after catalytic ozonation with supported FeOOH is observed at bromide concentration of 1 mg/L.Furthermore,HAAsFP of filtered water after catalytic ozonation with supported FeOOH are gradually decreased with increasing ozone dosage and extending the contact time.