| Title |
Seasonal Variations of Natural Organic Matters in Drinking Water Sources and Their Removal Characteristics During Treatment Processes |
| Authors |
배병욱 ; 김영일 ; 임봉수 ; 방미란 ( Byung Uk Bae ; Young Il Kim ; Bong Su Lim ; Mi Ran Bang ) |
| Abstract |
The seasonal variations of natural organic matters(NOM) in drinking water source and their removal characteristics through water treatment processes were investigated for two kinds of source waters in Kum-River. The quality of raw water at the Chungju water treatment plant(WTP) was stable throughout one year of sampling period. However, the source water at the Puyo WTP showed higher variations in DOC(dissolved organic carbon) and turbidity compared to the Chungju WTP. The SUVA(specific UV absorbance) values of both raw waters were less than 3 and had a trend to decrease after coagulation/sedimentation process. This results indicate that relatively large organic matters which have higher absorptivity per unit DOC might be easily removed during coagulation process. The AHS(aquatic humic substance) contents of both raw waters varied seasonally, but the Puyo WTP had a relatively higher AHS contents than the Chungju WTP. Results from the change in molecular weight distribution(MWD) before and after AHS measurement showed that AHS was mainly composed of organics higher than MW 1,000. The PAC(powdered activated carbon) might be used as an effective method for removing organic matters, especially for AHS, and the addition of PAC before coagulation showed the most satisfactory result with respect to DOC removal. |