Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Evaluation of Hydraulic Characteristics Influenced by Different Deflector Baffles in the Sedimentation Basin with Inclined Plate Settler

경사판 침전지에서 저류벽의 설치위치에 따른 수리학적 특성의 평가

  • Yu, Myong-Jin (Department of Environmental Engineering, University of Seoul) ;
  • Kim, Hyun-Chul (Water Environment and Remediation Center, Korea Institute of Science and Technology) ;
  • Ryu, Seong-Ho (Newentec Environmental Services, Inc.)
  • 유명진 (서울시립대학교 환경공학부) ;
  • 김현철 (한국과학기술연구원 수질환경 및 복원연구센터) ;
  • 류성호 (뉴엔텍(주))
  • Received : 2004.09.20
  • Accepted : 2004.11.29
  • Published : 2005.01.30
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Abstract

Sedimentation is one of the most common and important units in conventional water treatment plant. Structure such as various baffle walls and inclined plate settler may be obstacles to the horizontal flow when it is poorly designed. Therefore, the effects of these structures on characteristics of hydraulic flow must be evaluated to improve the settling efficiency of the floc. The hydraulic characteristic of the two sedimentations at Y water treatment plant (YWTP), which have different deflector baffles inside the settling basin, were investigated by tracer (fluoride) test. The inclined plate settler installed inside settling basin caused an undesirable impact on horizontal flow and produced dead zone. Solid baffle wall under the plate settler could help to minimize the formation of density currents and flow short circuiting. NaF used as a tracer was recovered more than 90% at investigated all basins. Morill index ($t_{90}/t_{10}$), Modal index ($t_p/T-HRT$) and short-circuiting index ($[M-HRT-t_p]/M-HRT$) were determined from tracer test results performed at YWTP. Those indices ranged 2.95~3.02, 0.40~0.53 and 0.32~0.46, respectively.

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References

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