Estimating the Microbial Risk of E. coli in Reclaimed Wastewater Irrigation on Paddy Field |
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Authors: | Youn-Joo An Chun G Yoon Kwang-Wook Jung Jong-Hwa Ham |
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Institution: | (1) Department of Environmental Science, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul, 143-701, South Korea |
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Abstract: | Microbial risk was quantified to assess human health risk as a result of exposure to E. coli in reclaimed wastewater irrigation. Monitoring data on E. coli were collected from pond water in paddy rice plots during the growing season. Five treatments were used and each was triplicated
to evaluate the changes in E. coli concentrations in experiments performed in 2003 and 2004. The Beta-Poisson model was used to estimate the microbial risk
of pathogen ingestion among farmers and neighboring children. A Monte Carlo simulation (10,000 trials) was conducted to estimate
the risk associated with uncertainty. In this study, risk values ranged from 10−4 to 10−8. UV-disinfected irrigation water showed a lower risk value than others, and its level was within the range of the actual
paddy rice field with surface water. Agricultural activity was thought to be safer after 1–2 days, when the paddy field was
irrigated with reclaimed wastewater. Also, children were found to have a greater risk of infection with E. coli. This paper should be viewed as a first step in the application of quantitative microbial risk assessment of wastewater reuse
in paddy rice culture. |
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Keywords: | E coli Microbial risk assessment Monte Carlo simulation Paddy rice culture UV-disinfection Water reuse |
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