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Internal Short-circuiting Estimation in Clearwell : Part A. Improving T10/T Using Intra Basin and Diffuser Wall by Applying ISEM to Field  

Shin, Eunher (KAIST 건설 및 환경공학과)
Lee, Seungjae (KAIST 건설 및 환경공학과)
Kim, Sunghoon (KAIST 건설 및 환경공학과)
Park, Heekyung (KAIST 건설 및 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.22, no.1, 2008 , pp. 105-112 More about this Journal
Abstract
Disinfection is a basic and effective microorganism inactivation method and historically contributed a decrease in waterborne diseases. To guarantee the disinfection ability, improving T in CT value is important. Many indexes are used to estimate the hydraulic efficiency, however, these are black-box analysis. Therefore it is need to develope new estimation method. In this study, internal short-circuiting estimation method (ISEM) is developed using CFD and we inquire into the factor which causes increase of $T_{10}/T$ value as LW ratio increases. And the effect of shape on the relation of LW ratio and $T_{10}/T$ is analyzed. As LW ratio increases, internal short-circuiting index (ISI) of influent and effluent zone is rapidly reduced and recirculation and dead zone are reduced in channel zone. Therefore, as the $T_{10}/T$ value converges maximum value, ISI curve is changed from "V" shape to "U" shape and hydraulic efficiency is improved especially in downstream portion of clearwell. The less the shape ratio(width/length of clearwell) is the less the $T_{10}/T$ value is at a same LW ratio because the portion of turning zone increases as shape ration decreases, therefore more boundary separation is generated.
Keywords
CFD model; LW ratio; CT value; internal short-circuiting estimation method; internal short-circuiting index;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Imad A. Hannoun, Paul F. Boulos, and John List(1998) Using hydraulic modeling to optimize contact time, Jour. AWWA, 90(8), pp.77-87   DOI
2 USEPA(1989) GuidanceManual for Compliance with the Filtration and Disinfection Requirements for Public Water Systems Using Surface Water Sources, Denver, Co: AWWA
3 박창근(1997), 시스템학, (주)범양사, 서울
4 Bishop Mark M., J Mark Morgan, Brendon Cornwell, and Donald K. Jamison (1993) Improving the Disinfection Time of Water Plant Clearwell. Jour. AWWA, 85(3), pp.68-75
5 신은허, 김성훈, 박희경, 안재찬, 최재호, 최영준(2005) 정수지의 형상과 유입유량이 $T_{10}$에 미치는 영향 연구, 상하수도학회지, 19권 6호, pp.819-826
6 Imad A. Hannoun, Faul Boulos(1997), Optimizing distribution storage water quality: A hydrodynamic approach, Appl. Math Modelling, 21, pp.495-502   DOI   ScienceOn
7 Mark M. Clark, Joel Ducoste, and Catherine Burns(1999) Improving Clearwell Design for CT Compliance. AWWARF and AWWA
8 Hong Wang and Roger A. Falconer(1998) Simulating Disinfection Processes in Chlorine Contact Tanks Using Various Turbulence Model and High-Order Accurate Difference Schemes. Wat. Res. 32(5). pp.1529-1543   DOI   ScienceOn
9 Marske, D.M. and Boyle, J.D.(1973) Chlorine Contact Chamber Design-A Field Evaluation. Water and Sewage Works, 12(1) pp.1-70