Water treatment processes of the research objective drinking water treatment plant are composed of prechlorination, coagulation, precipitation, sand filtration and postchlorination process. The main chlorination by-product (DBPs) of the research objective drinking water treatment plant are Trihalome...
Water treatment processes of the research objective drinking water treatment plant are composed of prechlorination, coagulation, precipitation, sand filtration and postchlorination process. The main chlorination by-product (DBPs) of the research objective drinking water treatment plant are Trihalomethanes(THMs) and Haloacetic acids(HAA_(5)) that are investigated the characteristics of speciation and occurrence in full-scale drinking water treatment plant by the water treatment processes and investigated about the positive control method. The results were as follows. The maximum DOC concentrations of raw water was 4.070 mg/L and the minimum concentrations was 0.690 mg/L, the maximum of Specific UV absorbance(SUVA) was 4.4(L/mg/m) and the minimum was investigated 0.8. Mean value was 1.8 was the characteristics of NOM in raw water appeared with hydrophily. The process by average SUVA of the raw water, precipitation water, filtrate water, treated water was investigated respectively with 1.8, 2.1, 2.1 and 1.3 but the average concentrations of Trihalomethanes(THMs) increased respectively by the water treatment processes. At summer THMs concentration was caused by seasonally with water temperature increasing appeared highly. The average concentrations of Haloacetic acids(HAA_(5)) at each process which is precipitation water, filtrate water, finished water was investigated respectively with 15.5 ppb, 14.9 ppb and 25.8 ppb. It was caused by the concentration of free chlorine decreasing that Some of HAA_(5) concentration was decreasing from filtration process. HAA_(5) concentration was highest at summer From all processes the major species of THMs was chloroform and the second highest was bromodichloromethane(BDCM), the third highest was dibromochloromethane(DBCM), while the concentration of bromoform was below detection limites. The ratio of chloroform/THMs at precipitation water, filtrate water, finished water was respectively 0.88, 0.87 and 0.73, with the fact that the bromine orgin THMs from the disinfecting process which is investigated with 0.73 occurs plentifully. The ratio of THMs/HAA_(5) in treated water was 0.57. HAA_(5) occurs about dobule than THMs. From all processes the major species of HAA_(5) was trichloroacetic acid(TCAA) and the second highest was dichloroacetic acid(DCAA), the third highest was dibromoacetic acid(DBAA), while the concentration of monochloroacetic acid(MCAA) and monobromoacetic acid(MBAA) was below detection limites. The sum of DCAA and TCAA was 90.4% of HAA_(5) on average base, but in case consequently, the ratio coming to be low below 50%, do HAAs disinfecting by-product managements are thought with the fact that maybe add DBAA. It was speciation of THMs that was caused by changing SUVA value of each process than changing SUVA and water temperature of raw water. It was speciation of HAA_(5) that was caused by changing the concentration of bromine in raw water and changing chlorine dose. In case of few of artificial pollution source arround river, SUVA value of River was higher than that of reservoir in few of artificial pollution source. At that time the ratio of THMs/HAA_(5) increased and the occurrence of THMs and HAA_(5) decreased in treated water. Consequently, it was found that the occurrence of DBPs decreased with raising a ratio of river water in raw water.
Water treatment processes of the research objective drinking water treatment plant are composed of prechlorination, coagulation, precipitation, sand filtration and postchlorination process. The main chlorination by-product (DBPs) of the research objective drinking water treatment plant are Trihalomethanes(THMs) and Haloacetic acids(HAA_(5)) that are investigated the characteristics of speciation and occurrence in full-scale drinking water treatment plant by the water treatment processes and investigated about the positive control method. The results were as follows. The maximum DOC concentrations of raw water was 4.070 mg/L and the minimum concentrations was 0.690 mg/L, the maximum of Specific UV absorbance(SUVA) was 4.4(L/mg/m) and the minimum was investigated 0.8. Mean value was 1.8 was the characteristics of NOM in raw water appeared with hydrophily. The process by average SUVA of the raw water, precipitation water, filtrate water, treated water was investigated respectively with 1.8, 2.1, 2.1 and 1.3 but the average concentrations of Trihalomethanes(THMs) increased respectively by the water treatment processes. At summer THMs concentration was caused by seasonally with water temperature increasing appeared highly. The average concentrations of Haloacetic acids(HAA_(5)) at each process which is precipitation water, filtrate water, finished water was investigated respectively with 15.5 ppb, 14.9 ppb and 25.8 ppb. It was caused by the concentration of free chlorine decreasing that Some of HAA_(5) concentration was decreasing from filtration process. HAA_(5) concentration was highest at summer From all processes the major species of THMs was chloroform and the second highest was bromodichloromethane(BDCM), the third highest was dibromochloromethane(DBCM), while the concentration of bromoform was below detection limites. The ratio of chloroform/THMs at precipitation water, filtrate water, finished water was respectively 0.88, 0.87 and 0.73, with the fact that the bromine orgin THMs from the disinfecting process which is investigated with 0.73 occurs plentifully. The ratio of THMs/HAA_(5) in treated water was 0.57. HAA_(5) occurs about dobule than THMs. From all processes the major species of HAA_(5) was trichloroacetic acid(TCAA) and the second highest was dichloroacetic acid(DCAA), the third highest was dibromoacetic acid(DBAA), while the concentration of monochloroacetic acid(MCAA) and monobromoacetic acid(MBAA) was below detection limites. The sum of DCAA and TCAA was 90.4% of HAA_(5) on average base, but in case consequently, the ratio coming to be low below 50%, do HAAs disinfecting by-product managements are thought with the fact that maybe add DBAA. It was speciation of THMs that was caused by changing SUVA value of each process than changing SUVA and water temperature of raw water. It was speciation of HAA_(5) that was caused by changing the concentration of bromine in raw water and changing chlorine dose. In case of few of artificial pollution source arround river, SUVA value of River was higher than that of reservoir in few of artificial pollution source. At that time the ratio of THMs/HAA_(5) increased and the occurrence of THMs and HAA_(5) decreased in treated water. Consequently, it was found that the occurrence of DBPs decreased with raising a ratio of river water in raw water.
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