This study aimed to compare the removal efficiencies of natural organic matter (NOM) and
disinfection by-products (DBPs) in Koyang Advanced Water Treatment Plant or KAWTP,
Ilsan Conventional Water Treatment Plant or ICWTP, and a mixed-water point in the distribution
system. Aside from doing conventional water treatment, KAWTP also carries out
postozonation and granular activated carbon adsorption followed by chlorination. NOM
removal efficiencies of advanced treated water, conventional finished water, and blended
water were 74, 22, and 31%, respectively. Biodegradable dissolved organic carbon (BDOC)
removal efficiencies of advanced treated water, conventional finished water, and blended
water were 78, 66, and 52%, respectively. The removal efficiencies of DBPs in comparison
with conventional finished water were also analyzed. Trihalomethans, chloral hydrate, and
haloacetic acids in the advanced treated water had removal efficiencies of 88, 97, and 98%,
respectively. Their removal efficiencies in the conventional treated water were 77, 78, and
87%, respectively. It was concluded that DBPs are efficiently controlled by advanced water
treatment process. Blending can be applied to other distribution systems to which water is
supplied from both conventional treatment plants and advanced treatment plants