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Discharge Characteristics of the Indicator Microorganisms of Combined Sewer Overflows  

Kim, Geonha (한남대학교 공과대학 토목환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.4, 2006 , pp. 627-635 More about this Journal
Abstract
Combined sewer overflow (CSOs) is a primary diffuse source degrading water quality of urban streams. In this study, CSOs caused by 5 different rainfall events at an urban watershed located in Daejeon city were monitored for the indicator microorganism concentrations. Event mean concentration (EMC) of the indicator microorganisms were: total coliform = $2.46{\times}10^6CFU/100mL$; fecal coliform = $1.01{\times}10^6CFU/100mL$; E.coli = $5.20{\times}10^5CFU/100mL$; and Fecal Streptococci = $6.08{\times}10^5CFU/100mL$. In addition, coliform concentrations were well correlated with suspended solid concentrations and the first flush effects were identified. Settling tests were carried out to estimate removal rate of indicator organisms by sedimentation from CSOs. As microorganisms are discharged in association with suspended solid, ten minutes of settlement can lower 44% of indicator microorganism leading.
Keywords
Coliform; diffuse sources; microbial contaminant; event mean concentration (EMC); water quality;
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