| Title |
A Study on the Removal of THM Precursors and THM in Water Supply |
| Authors |
정팔진 ; 임봉수 ; 김영철 ; 김영규 ( Paul Gene Chung ; Bong Su Lim ; Young Chul Kim ; Young Kyu Kim ) |
| Abstract |
It has been confirmed that some Trihalomethanes(THMs) suspected as carcinogens, can be formed during chlorination for water supply through the reaction of chlorine and humic substances in water. A lot of researches have showed that the amount of THMs formed during chlorination can be reduced by the removal of humic substances in water, which are THM precursors. In this study, the removal efficiencies of THM precursors by 10 sets of water treatment processes were examined for artificial water samples prepared by dissolving humic acids in tap water aerated for 48 hours. The removal efficiencies were estimated by measuring the concentrations of THMs formed when sample was mixed with chlorine. The estimated removal efficiencies were ranged from 30% of simple ozonation to 96% of ozonation followed by flocculation and sand filtration. The best process selected in this study was extended to the treatment of water collected from Chonju water supply sources. The result also showed the removal efficiency of THM formation potential is higher than 95%. |