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2차처리수의 농업용수로 재이용을 위한 UV 처리 후 지표미생물의 회복 조사
윤춘경 ( Yun Chun Gyeong ),황하선 ( Hwang Ha Seon ),정광욱 ( Jeong Gwang Ug ),함종화 ( Ham Jong Hwa ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.5
A pilot study was performed to examine the repair of indicator microorganisms after UV irradiation for agricultural reuse of reclaimed water. The effluent of biofilter for 16-unit apartment was used as input to the UV disinfection system, and average SS and BOD concentration were 3.4 and 5.9 mg/L, respectively. and the mean level of total coliform was in the range of 1.0×10₄MPN/100mL. Two UV doses of 6 and 16 mW·s/㎠ were applied and microorganism repair was monitored under the dark, photoreactivating light, and sun light. Microorganism repair was observed in the UV dose of 6 mW·s/㎠ , and numbers increased up to 5% at the photoreactivating light and 1 % at the dark. However, microorganisms were inactivated rather than reactivated at the sun light and numbers decreased to non-detectible level in 4 hours. In the case of 16 mW·s/㎠ , microorganism repair was not observed indicating that UV dose might affect the repair process. Therefore, concerns associated with microorganism repair could be controlled by sufficient UV dose application. Agricultural reuse of reclaimed water might be even less concerned due to exposure to the sun light which could further inactivate microorganisms. The pilot study result is encouraging, however, sanitary concern in water reuse is so critical that more comprehensive investigation is recommended.
전지홍 ( Jeon Ji Hong ),윤춘경 ( Yun Chun Gyeong ),황하선 ( Hwang Ha Seon ),윤광식 ( Yun Gwang Sig ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.3
Water quality model applicable paddy field was developed using field experiment during 1999~2002. This model involves inputs from fertilization and sediment release as dirac delta function and continuous source function, respectively, and can simulate various processes such as ponded depth, surface drainage, total nitrogen concentration and total phosphorus concentration in a daily basis. The model was calibrated using data collected from field experiments which was irrigated with ground water and validated from field experiments which was irrigated with surface water. The nutrient concentration of surface water depended on the fertilization and dirac delta function can efficiently explain the valiance of nutrient concentration of surface water by fertilizer. As a result of calibration and validation, this model demonstrates good agreement. The model fit efficiencies (R²) of ponded depth, surface concentration of TN and TP were 0.93, 0.98 and 0.95, respectively for calibration, and whose of TN and TP were 0.99 and 0.70, respectively for validation. We can apply lake and reservoir model to analysis paddy field considered with shallow ponded system, but it will need so many parameters and have much uncertainty. Fortunately, paddy field have a series of cultural practices yearly basis, such as irrigation-fertilization-forced drain-harvest with a similar time, so simple model may explain the mechanism for paddy field. Water quality model for paddy field developed in this study is simply, needs little parameters, but appeared high applicability to evaluate paddy filed drainage. We recommend this model to estimate nutrient loading from paddy field and establish best management practice.