摘要：Due to growing population and increasing contamination of surface and groundwater, it is necessary toprotect public health by drinking water disinfected with chlorine, the most common method of disinfection.Despite enormous benefits of the chlorination method, there are also disadvantages to human health.Disinfection by-products cause a variety of diseases like cancers in humans. The main group of these byproducts is Trihalomethanes (THMs). Different methods such as adsorption, air stripping packed-column,nano-filtration, and granular activated carbon have been applied to eliminate THMs from water resources. Inthis study, Advanced Oxidation Process (AOP) method is used to reduce the contamination of THMs inTehran drinking water. EPA method 551/1 was used for quantifying the analysis of trihalomethane compoundsapplying a gas chromatography equipped with an ECD detector. AOP method was performed in a photoreactorequipped with 4 UV lamps. The effects of UV radiation, concentration of hydrogen peroxide, and amount ofZnO nanocatalyst on oxidation reaction of THMs have been investigated. Results show that an optimumamount of hydrogen peroxide with and without applying the catalyst was 5 mL of concentrated solution(30%), and the optimum amount of catalyst with this amount of hydrogen peroxide was 0.5 g in 100 mL ofdrinking water samples with constant reaction time (1hr) and UV irradiation. The yield of THMs removalreaction in these conditions has been determined 91.78 %. One of the most important superiority of thismethod, in comparison with other THMS removing methods, is the reduction of THMs contamination ofdrinking water in trace amounts.
