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염철민,조순행,윤제용 대한상하수도학회 2002 상하수도학회지 Vol.16 No.4
This study was designed to evaluate the disinfection performance in water treatment plants (WTPs, n=16) in Seoul. Disinfection requirement based on the SWTR (Surface Water Treatment Rule) of the U.S. (0.5-log and 1.5-log Giardia removal) was applied in estimating the disinfection performance of WTPs in Seoul. The water treatment process or unit steps used for this evaluation includes inlet pipe line, flocculation basin, sedimentation basin, clearwell, and storage tank. The major results are as follows. First, it was found that all WTPs in Seoul meet a virus removal criteria (4-log removal). Second, the baffling factors (T_10/T) in treatment processes used for this evaluation which was selected by Seoul Water Works were found 1.0 for inlet pipe line, 0.2 for flocculation basin, 0.7 for sedimentation basin, and 0.5 for clearwell, respectively. Since the selection of right baffle factors (T_10/T) is critically important, further rationalization is required in this process. Residual chlorine concentration in clearwell varied from 0.4 to 1.0mg/L. Third, for the disinfection criteria of 3-log Giardia inactivation, almost all of disinfection data which were provided by Seoul Water Works can meet the CT requirement even at worst water quality condition. However, if disinfection criteria is strengthened to 4-log Giardia inactivation, then only 38% of disinfection data can meet the CT requirement. Rational disinfection criteria need to be developed, based on the occurrence of Giardia or other indicating microorganisms occuring in source water. Fourth, significant improvement of disinfection performance in 2001 at all WTPs in Seoul was made as compared to that of 1999 year.
염철민,최유식,변석종,조순행,윤제용 대한상하수도학회 2002 상하수도학회지 Vol.16 No.2
This study was conducted to investigate the haloacetic acid (HAAs) formation characteristics in raw and treated water in Korea. The raw and treated water from the five major rivers were examined to measure the HAAs concentrations and compared those with literature values. Major findings are as follows. First, average HAAs concentration of treated water (collected from three water treatment plants) in Korea appeared to be 62.5±66.7㎍/L (n=7) and this level is higher than the average trihalomethanes (THMs) concentration (13.2±12.9㎍/L, n=6933) reported recently. Second, the average formation potential of TCAA and DCAA after three days was found as 103±74㎍/L (n=14) and 76±36㎍/L (n=14), respectively. As this result was applied to US-EPA developed model equation for TCAA and DCAA formation, dissolved organic matter (DOM) in Korea has a tendency to produce more TCAA and DCAA as compared to US. This phenomenon was especially notable in DCAA. The sum of weight percentage of TCAA and DCAA which are individual component of HAAS was composed of 80% of HAAs.