Browse > Article

Modeling of Particle Removal in the Coarse Media of Direct Horizontal-Flow Roughing Filtration  

Ahn, Hyo-Won (한국수자원공사 수자원연구원)
Park, No-Suk (한국수자원공사 수자원연구원)
Lee, Sun-Ju (한국수자원공사 수자원연구원)
Lee, Kyung-Hyuk (한국수자원공사 수자원연구원)
Wang, Chang-Keun (충남대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.19, no.3, 2005 , pp. 338-347 More about this Journal
Abstract
Horizontal-Flow Roughing Filtration (HRF) is one of altemative pretreatment methods e.g. prior to Slow Sand Filtration (SSF). However, some of its limitations are that the effluent quality drops drastically at higher turbidity (>200 NTU) and at higher filtration rate (>1 m/h). To overcome these drawbacks, we suggested Direct Horizontal-Flow Roughing Filtration (DHRF), which is a modified system of Horizontal-Flow Roughing (HRF) by addition of low dose of coagulant prior to filtration. In this study to optimize the DHRF configuration, a conceptual and mathematical model for the coarse compartment has been developed in analogy with multi-plate settlers. Data from simple column settling test can be used in the model to predict the filter performance. Furthermore, the model developed herein has been validated by successive experiments carried out. The conventional column settling test has been found to be an handy and useful to predict the performance of DHRF for different raw water characteristics (e.g. coagulated or uncoagulated water, different presence of organic matter, etc.) and different inital process conditions (e.g. coagulant dose, mixing time and intensity, etc.). An optimum filter design for the coarse compartment (grain size 20mm) has been found to be of 3 m/h filtration rate with filter length of 4-4.5 m.
Keywords
Direct Horizontal-Flow Roughing Filter (DHRF); mathematical model; coarse media; optimum filter design;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Yao, K.M. (1969) 'Theoretical study of high-rate sedimentation, Annual conference of the water pollution control federation, Dallas, Texas, act
2 Wambulwa, P.S. (1992) 'Study on the influence of rapid mixing on the performance of direct horizontal-flow roughing filtration', M. Sc, Thesis, EE60, IHE, Delft, Netherlands
3 Ahn, H.W. (1992) 'Modeling of Particle Removal in the First Coarse Media of Direct Horizontal-Flow Roughing Filtration' , M.sc. Thesis Report, IHE, Delft, Netherlands
4 Ahsan, T., Alaerts, G.J.F.R. & Buiteman, J.P. (1991) 'Direct horizontal-flow roughing filtration; An improved pretreatment process for highly turbid water', Proc. of the Filtration Society Conference, Karlsruhi-Germany, Oct.
5 Wegelin, M., Boller, M. & Scherlender (1987) 'Particle removal by horizontal-flow roughing filtration', Journal of water supply science & technology-AQUA-, No. 2, pp. 80-90
6 Huisman, L. (1986) 'Sedimentation and Floatation, Lecture Note, IHE, Delft, Netherlands
7 Bikaba, D. (1991) 'Direct horizontal-flow roughing filtration; Study of turbidity removal mechanisms and design parameters for optimum length', M. Sc Thesis, IHE, Delft, Netherlands
8 Camp, T.R. (1946) 'Sedimentation and the design of settling tanks', Transactions, ASCE, Vol. III, No. 2285, pp. 895-958
9 IWACO, Adviesbureau voor water en milieu, (1990) 'The application of horizontal-flow roughing filter (HRF) as pretreatment for slow sand filtration -A case study in Desa Plumbon, Indonesia; Rotterdam, Netherlands