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초록

This study was performed to investigate the distribution characteristics of bacterial
indicators of fecal contamination in sewage treatment plants of Seoul for enhancing the
water quality standards of sewage effluent. Indicator bacteria were investigated in the
effluent samples, and the following ranges were reported: total coliforms 0~8.0×105
CFU/100 mL, fecal coliforms 0~2.2×105 CFU/100 mL, Escherichia coli 0~4.4×104 MPN/
100 mL, Enterococcus 0~1.3×104 MPN/100 mL. Total coliform analysis was performed
by the pour plate and membrane filtration methods. It was observed that the membrane
filtration method had higher accuracy and sensitivity compared to the pour plate method.
Percent distributions of bacterial indicators of health hazards(total coliforms) were fecal
coliforms, 22.3%, E. coli, 10.3%, and Enterococcus, 4.9%. In addition, biochemical
identification of total coliforms showed that Klebsiella and Enterobacter comprised
34.8% and 26.1% of the total population, respectively. E. coli accounted for 13.0% of
total coliforms and 73.9% of fecal coliforms. Total coliforms include bacteria that are
widespread in the natural world, and even extraneous to fecal contamination. Therefore,
fecal coliforms and E. coli are suitable water quality indicators that can precisely
determine fecal contamination. Improvements for strengthening and expanding bacterial
indicators of fecal contamination for the current quality standards of effluent water are
needed to maintain the river ecology.
This study was performed to investigate the distribution characteristics of bacterial
indicators of fecal contamination in sewage treatment plants of Seoul for enhancing the
water quality standards of sewage effluent. Indicator bacteria were investigated in the
effluent samples, and the following ranges were reported: total coliforms 0~8.0×105
CFU/100 mL, fecal coliforms 0~2.2×105 CFU/100 mL, Escherichia coli 0~4.4×104 MPN/
100 mL, Enterococcus 0~1.3×104 MPN/100 mL. Total coliform analysis was performed
by the pour plate and membrane filtration methods. It was observed that the membrane
filtration method had higher accuracy and sensitivity compared to the pour plate method.
Percent distributions of bacterial indicators of health hazards(total coliforms) were fecal
coliforms, 22.3%, E. coli, 10.3%, and Enterococcus, 4.9%. In addition, biochemical
identification of total coliforms showed that Klebsiella and Enterobacter comprised
34.8% and 26.1% of the total population, respectively. E. coli accounted for 13.0% of
total coliforms and 73.9% of fecal coliforms. Total coliforms include bacteria that are
widespread in the natural world, and even extraneous to fecal contamination. Therefore,
fecal coliforms and E. coli are suitable water quality indicators that can precisely
determine fecal contamination. Improvements for strengthening and expanding bacterial
indicators of fecal contamination for the current quality standards of effluent water are
needed to maintain the river ecology.