Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
권호 표지

The Effect of Dead Zone on Hydraulic Efficiency in Clearwell

정수지내 사류지역이 수리학적 효율에 미치는 영향 연구

  • 이승재 (한국과학기술원 건설 및 환경공학과) ;
  • 신은허 (한국과학기술원 건설 및 환경공학과) ;
  • 김성훈 (한국과학기술원 건설 및 환경공학과) ;
  • 박희경 (한국과학기술원 건설 및 환경공학과)
  • Received : 2006.10.11
  • Accepted : 2007.03.05
  • Published : 2007.04.15
Download PDF
⟨ Previous Next ⟩

Abstract

Hydraulic efficiency($T_{10}/T$) in clearwell is often estimated by L/W ratio. However, this estimation is not accurate because other factors which give an effect on hydraulic efficiency such as shape of basin, diffuser wall and intra-basin is ignored. Therefore, in this research, hydraulic efficiency is predicted by the quantitative analysis of dead zone using CFD simulation in a pilot scale clearwell. The results show that the reason why higher L/W ratio increase the hydraulic efficiency is to decrease the dead zone of linear region which is located between baffles. Diffuser wall or intra-basin also affects on hydraulic efficiency with this process. Also, we conclude that hydraulic efficiency can not be reached to 0.8 or higher.

Keywords

References

  1. 신은허, 김성훈, 박희경, 안재찬, 최재호, 최영준(2005) 정수지의 형상과 유입유량이 T10에 미치는 영향 연구, 상하수도학회지, 19(6), pp.819-826
  2. Bishop M.M., Morgan J.M., Cornell B., and Jamison D.K. (1993) Improving the Disinfection Time of Water Plant Clearwell, Jour. AWWA, 85(3), pp. 68-75
  3. Shilton A. and Harrison J. (2003) Development of guidelines for improved hydraulic design of waste stabilisation ponds, Water Science and Technology, 48(2), pp. 173-180
  4. Clark M.M., Ducoste J. and Burns C. (1999) Improving Clearwell Design for CT Compliance, AWWARF and AWWA
  5. Hannoun I.A., Boulos F. (1997) Optimizing distribution storage water quality: A hydrodynamic approach, Appl. Math. Modelling, 21, pp. 495-502 https://doi.org/10.1016/S0307-904X(97)00043-7
  6. Hannoun I.A., Boulos F. and List J. (1998) Using hydraulic modeling to optimize contact time, Jour. AWWA, 90(8), pp. 77-87 https://doi.org/10.1002/j.1551-8833.1998.tb08487.x
  7. Lee Seungjae, Shin Eunher, Kim Sunghoon, and Park Heekyung (2006) Improving Hydraulic Efficiency of Clearwell Using CFD Simulation, 15th Joint KKNN Symposium, Kyoto, Japan
  8. Thackston, E.L, Shields Jr., F. Douglas Jr. and Schroeder, P. R. (1987), Residence Time Distributions Of Shallow Basins, J. Envir. Eng. ASCE, 113(6), pp. 1319-1332 https://doi.org/10.1061/(ASCE)0733-9372(1987)113:6(1319)
  9. Wang H. and Falconer R.A. (1998) Simulating Disinfection Processes in Chlorine Contact Tanks Using Various Turbulence Model and High-Order Accurate Difference Scheme, Wat. Res., 32(5) pp. 1529-1543 https://doi.org/10.1016/S0043-1354(98)80014-6