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Evaluation of Coagulants Dispersion in Pump Diffusion Mixer for Water Treatment  

Park, Young-Oh (한국수자원공사)
Park, No-Suk (한국수자원공사)
Kim, Seong-Su (한국수자원공사)
Kim, Ki-Don (한국수자원공사)
Lim, Kyung-Ho (공주대학교 건설환경공학부)
Publication Information
Journal of Korean Society of Water and Wastewater / v.22, no.1, 2008 , pp. 49-63 More about this Journal
Abstract
The objectives of this research were to evaluate the pressurized/the main inlet water flowrate ratio which have been used as the most important parameter for operating the pump diffusion mixer until now, to suggest the alternative operating parameter and the relating criteria if the flowrate ratio was not inadequate. For the objectives of this research, computational fluid dynamics (CFD) simulation was conducted for 21 cases of flowrate ratio in full-scaled pump diffusion mixer. From the results of CFD simulation, the local velocity gradient values were calculated in each case in order to analyze the simulation results in more detail. For verifying CFD simulation, wet test was conducted. The wet test was to measure the factual coagulant dispersion distribution at a distance of 5.4m from deflector. From both results of CFD simulation and wet test, flowrate ratio was inadequate as operating parameter or criteria, on the other hand the pressurized/the main inlet velocity ratio(dimensionless) was useful in predicting the performance of pump diffusion mixer. Also, the injected coagulant could be dispersed evenly in overall cross section on the condition that pressurized/the main inlet velocity ratio(dimensionless) is over at least 20.
Keywords
pump diffusion mixer; flowrate ratio; velocity ratio; CFD simulation; wet test;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 Kawamura, S. (1976) Consideration in Improving Flocculation. Journal of AWWA, 68(5), 328-336   DOI
2 Vrale, L. and Jorden R. M. (1971) Rapid Mixing in Water Treatment. Journal of AWWA, 63(1), 52-58   DOI
3 Amirtharajah A. and Mills, P (1982) Rapid-Mix Design for Mechanisms of Alum Coagulation. Journal of AWWA, 74(5) 210-216   DOI
4 No-Suk Park and Heekyung Park, 2002, Analysis of local velocity gradients in rapid mixer using particle image velocimetry technique, Water Science and Technology, Water Supply, Vol. 2 No. 5-6, pp. 47-55
5 Clark M.M., Srivastava J.S., Lang R.R., Trussell L.J., McCollum D., Bailey, J.D. Christie, G. Stolarik (1994) Selection and Design of Mixing Processes for Coagulation, AWWA Research Foundation, Denver, USA
6 Hudson, H. E. and Wolfner, J. P., (1967) Design of Mixing and Sedimentation Basins. Journal of AWWA, 59(10), 1257-1268   DOI
7 Hyun-Chul Kim and Seockheon Lee. (2006) Pump diffusion flash mixing for improving coagulation process in drinking water treatment, Separation & Purification Technology, 52, 117-125   DOI   ScienceOn
8 Kawamura. S. (1991) Integrated Design of Water Treatment Facilities, JOHN WILEY & SONS, INC. New York