Browse > Article

Evaluation of Hydraulic Characteristics Influenced by Different Deflector Baffles in the Sedimentation Basin with Inclined Plate Settler  

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.)
Publication Information
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.
Keywords
Inclined plate settler; Deflector baffle; Tracer test; Morill index; Modal index; Short-circuiting index;
Citations & Related Records
연도 인용수 순위
  • Reference
1 유명진, 김현철, 류성호, 수평류 및 상향류식 경사판에 의한 침전지내 수리학적 특성의 영향, 한국도시환경학회지, 4(1), pp. 17-24 (2004a)
2 Hudson, H. E. Jr., Residence Times in Pre-treatment, J. AWWA, 67(5), pp. 45-52 (1975)   DOI
3 Rebhun, M. and Argaman, Y., Evaluation of Hydraulic Efficiency of Sedimentation Basins, J .Sanitary Engineering Division, 91, pp. 37-45 (1965)
4 Kawamura, S., lntergrated Design and Operation of Water Treatment Facilities, 2nd ed. JOHN WILEY & SONS, INC., New York (2000)
5 Hudson, H. E. Jr., Water Clarification-Processes, Practical Design and Evaluation, Van Nostrand Reinhold, New York, pp. 123-138 (1981)
6 유명진, 김현철, 명규남, 류성호, 조항문, 경사판 침전지의 수리학적 특성에 대한 구조물의 영향, 대한상수도학회지, 18(4), pp. 427-436 (2004b)
7 Morill, A. B., Sedimentation Basin Research and Design, J. AWWA, 24(9), pp. 1442-1458 (1932)
8 U.S. Army Engineer Waterways Experiment Station, Documentation of the DYECON Module for ADDAMS: Determining the Hydraulic Retention and Efficiency of Confined Disposal Facilities, Technical Note EEDP-06-17, USA (1992)