Effect of Catalytic Ozonation with Supported Ferric Hydroxide on THMs Formation Potential of Filtered Surface Water

The effects of catalytic ozonation with supported ferric hydroxide(FeOOH)and ozonation alone on trihalomethane formation potential(THMFP)were investigated in a continuous flow reactor.The THMFP of the treated water by catalytic ozonation with supported FeOOH is 22% less than that by ozonation alone.It is related to the higher TOC reduction and higher reactivity of hydroxyl radical during catalytic ozonation with supported FeOOH.Under the conditions of different ozone dosages,bromide concentrations and contact time,the catalytic ozonation with supported FeOOH has a significant advantage over ozonation alone in controlling THMFP.With the increase of ozone dosage,the THMFP of the treated water by catalytic ozonation has an initial increase and followed decrease,and is less than that by ozonation alone.The high bromide concentration results in the predominance of brominated THMs,and the reduction efficiency of THMFP by catalytic ozonation is more significant.The THMFP of the treated water by catalytic ozonation can be further decreased as the contact time is prolonged.