Removal of disinfection by-product precursors with ozone-UV advanced oxidation process

The efficacy of using ozone ( O 3 ), ultraviolet irradiation (UV) and the combined O 3 -UV advanced oxidation process (AOP) to remove 2 classes of disinfection by-product (DBP) precursors from raw surface water samples have been evaluated and compared. In particular, trihalomethane and haloacetic acids formation potentials were measured. Laboratory batch scale experiments were carried out as a function of ozone and UV dosage in order to study the removal kinetics. It is concluded that the combined O 3 -UV AOP is more effective than either the ozone or UV treatment alone. Ozone-UV AOP is capable of mineralizing up to 50 % of the total organic carbon from the raw source water at an ozone dose of 0.62 ± 0.019 mg O 3 / mL and a UV dose of 1.61 W s / cm 2 . In addition, O 3 -UV AOP can reduce trihalomethane formation potential by roughly 80 % and haloacetic acids formation potential by roughly 70 % at the same ozone and UV dosage.