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Mortality Rates of Pathogen Indicator Microorganisms Discharged from Point and Non-point Sources in Urban Area  

Kim, Geonha (Department of Civil and Environmental Engineering, Hannam University)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.6, 2006 , pp. 1075-1081 More about this Journal
Abstract
In this research, mortality rates of pathogen indicator microorganisms discharged from various point sources and diffuse sources in urban area were measured. Water samples were taken at domestic sewer, combined sewer overflow, effluent from a wastewater treatment plant, urban river, and sediment of an urban river. Mortality rates of indicator microorganisms in domestic sewer estimated by assuming the first order kinetics at $20^{\circ}C$ were as follows: total coliform = 0.092/day, fecal coliform = 0.185/day, E. coli = 0.252/day, and fecal streptococci = 0.281/day. Sensitivity of mortality rates of total coliform on temperature was estimated as $K_{temp}=K_{20}{\times}1.162^{(temp-20)}$ for the range of $10-20^{\circ}C$. Mortality rates due to sunlight were measured as 1.22-1.59/day while mortality rate due to settling for 40 min were estimated as $9.21{\times}10^3-20.0{\times}10^3/day$.
Keywords
Coliform; Indicator microorganism; Mortality rate; Non-point sources; Pathogen;
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