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Environmental Engineering Research 2009;14(2): 120-125. DOI: https://doi.org/10.4491/eer.2009.14.2.120
Microbial Risk Assessment using E. coli in UV Disinfected Wastewater Irrigation on Paddy
Han-Pil Rhee1, Chun-G. Yoon1, Kwang-Wook Jung2, and Jang-Won Son1
1Department of Environmental Science, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea
2Research Division, Korea Water Environment Research Institute, Vision Bidg. 403 #1-11, Gunja-dong, Gwangjin-gu, Seoul, 143-837 Korea
Corresponding Author: Chun-G. Yoon ,Tel: +82-2-450-3747, Fax: +82-2-446-2543, Email: chunyoon@konkuk.ac.kr
Received: March 7, 2009;  Accepted: June 1, 2009.
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Water stress has become a major concern in agriculture. Korea suffers from limited agricultural water supply, and wastewater reuse has been recommended as an alternative solution. A study was performed to examine the effects of microorganism concentration in the ponded-water of a paddy rice field with reclaimed-water irrigation for evaluating the microbial risk to farmers and neighborhood children. Most epidemiological studies were performed based on an upland field, and they may not directly applicable to paddy fields. Beta-Poisson model was used to estimate the microbial risk of pathogen ingestion. Their risk value increased significantly high level after irrigation and precipitation. It implies that agricultural activities such as plowing, and fertilizing, and precipitation need be practiced a few days after irrigation considering health risks. The results about field application of the microbial risk assessment using E. coli showed difference according to monitoring time and treatment plot. Result of the microbial risk assessment showed that risk values of ground-water and reclaimed secondary wastewater irrigation were lower than directly use of wastewater treatment plants' effluent. This paper should be viewed as a first step in the application of quantitative microbial risk assessment of E. coli to wastewater reuse in a paddy rice farming.
Keywords: E. coli | Microbial risk | Paddy field | Wastewater reuse | Water quality
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