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김정현(Jeong Hyun Kim),하은정(Eun Jung Ha),윤장근(Jang Ken Yoon) 한국수처리학회 2001 한국수처리학회지 Vol.9 No.2
N/A The SWTR(Surface Water Treatment Rule) requires surface water treatment plants to achieve a 3log removal of Giardia cysts and 4log removal of viruses based on filtration, maintenance of CT[disinfectant concentration(㎎/L)×time(min)] through the disinfection process. Conventional treatment without disinfection is capable of achieving up to 2∼3log removal of Giardia cysts and up to a 1∼3log removal of viruses. Additional removals must be accomplished with disinfection(C×T value). Tracer-test was used in this study to calculate T_(10) of C×T value for achieving up to a 1log removal of Giardia cysts in disinfection process. Evaluations were implemented at three WTPs(Water Treatment Plants A, B, C). If CT product for a WTP meets or exceeds those in the SWTR tables, it is assumed that the degree of inactivation has been achieved. A WTP has not been achieved for the degree of inactivation result from CT_(cal)/CT_(req)=0.7 and the three WTPs have not been achieved for the degree of inactivation in worst case condition.
소규모정수장의 기능진단에 의한 성능제한 인자의 도출 및 검증 연구
하은정,오정우,김정현,윤장근 대한상하수도학회 2000 상하수도학회지 Vol.14 No.3
In this study, DWTP Advisor developed from U.S. EPA was adapted for performance assessment in small water treatment plant and studied for improvement advice about the problem. From results of performance assessment, the ability of each major unit process meets to Peak Instantaneous Flow(PIF) as Type I (above 95% of PIF) in N WTP. But, outlet condition in the sedimentation basin are permitting the loss of solids from the basin and the lack of proper solids removal is degrading the performance in N WTP. From results of the hydraulic analysis using fluoride tracer, flow rate in sedimentation basin is rapidly more lower than upper. The Reynolds number, Re, and Froude number, Fr which are used to predict flow condition in sedimentation basin is calculated to be 3159.98 and 2.06×10exp(-7), respectively. There is possibility of occurrence of short-circuiting and turbulence. Also, the different type of effluent trough makes unstable flow in sedimentation basin and increases carry-overing of sedimented solids.
유동 수치해석을 이용한 응집 , 침전지 유입 분배수로 설계인자 연구
하은정,오정우,김정현,윤장근 대한상하수도학회 2000 상하수도학회지 Vol.14 No.4
In water treatment plants, open channel is used to distribute incoming flow to parallel treatment unit, such as flocculation basin and sedimentation basin. These control devices must be designed so that the incoming flow evenly distributed to the process unit. this is important in the view of optimizing process unit. In the recent past, significant insights into the sedimentation process have been developed. In this study, the 2-D computer program is developed to investigate fluid flow field and velocity vectors in flocculationㆍsedimentation inlet distribution weir and calculate flow rates in each inlet weir. The specific purpose of this study is to analyze physical design factors, such as flow rates, shape of channel, tapered angle in tapered type channel and main channel width.