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http://dx.doi.org/10.14478/ace.2014.1054

Numerical Simulation of Three Dimensional Fluid Flow Phenomena in Cylindrical Submerged Flat Membrane Bioreactor for Aeration Rate  

Kim, Dae Chun (Graduate School of Energy and Environment, Seoul National University of Science & Technology)
Chung, Kun Yong (Department of Chemical and Biomolecular Engineering, Seoul National University of Science & Technology)
Publication Information
Applied Chemistry for Engineering / v.25, no.4, 2014 , pp. 401-408 More about this Journal
Abstract
In membrane bio-reactor (MBR), the aeration control is one of the important independent variables to decrease fouling and to save energy with shear stress change on the membrane surface. The paper was carried out for numerical simulation of 3-dimensional fluid flow phenomena of the cylindrical bioreactor with submerged flat membranes equipped in the center and supplied the air from the bottom by using the COMSOL program. The viscosity and temperature of solution were assumed to be constant, and the specific air demand based on permeate volume ($SAD_p$) defined as scouring air per permeate rates was used as a variable. The calculated CFD velocities were compared with those of the velocity meter measurement and video image analysis, respectively. The results were good agreement each other within 11% error. For fluid flow in the reactor the liquid velocity increased rapidly between the air diffuser and membrane module, but the velocity decreased during flowing of the membrane module. Also, the velocity increased as it was near from the reactor wall to the central axis. The calculated shear stress on the membrane surface showed the highest value at the center part of the module bottom side and increased as aeration rate increased. Especially, the wall shear stress increased dramatically as the aeration rate increased from 0.15 to 0.25 L/min.
Keywords
MBR; flat sheet membrane; CFD; wall shear stress; aeration rate;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 K. Y. Chung and J. P. Kim, Energy Saving Membrane Technology, 25-61, A-jin Co., Seoul, Korea (2010).
2 R. B. Bird, W. E. Sewart, and E. N. Lightfoot, Transport Phenomena, 2nd ed., 152-176, John Wiley & Sons, Inc., New York, USA (2001).
3 X. Yang, H. Yu, R. Wang, and A. G. Fane, Optimization of microstructured hollow fiber design for membrane distillation applications using CFD modeling, J. Membrane Sci., 422, 258-270 (2012).
4 Y. Wibisono, E. R. Cornelissen, A. J. B. Kemperman, W. G. J. van der Meer, and K. Nijmeijer, Two-phase flow in membrane processes: a technology with a future, J. Membrane Sci., 453, 566-602 (2014).   DOI   ScienceOn
5 A. Drews, H. Prieske, E. L. Meyer, G. Senger, and M. Kraume, Advantageous and detrimental effects of air sparging in membrane filtration: bubble movement, exerted shear and particle classification, Desalination, 250, 1083-1086 (2010).   DOI   ScienceOn
6 H. C. Shin and K. Y. Chung, Numerical analysis of concentration polarization for spacer configuration in plate type membrane module, App. Chem. Eng., 22(6), 703-710 (2011).
7 Y. Noh, Turbulence, 20-65, Sigma Press, Seoul, Korea (2000).
8 COMSOL Inc., COMSOL Multiphysics User's Guide, 34-67, ver. 4.3, Palo Alto, USA (2012).
9 S. Becker, A. Sokolichin, and G. Eigenberger, Gas-liquid flow in bubble columns and loop reactors: part II. comparison of detailed experiments and flow simulations, Chem. Eng. Sci., 49, 5747-5762 (1994).   DOI   ScienceOn
10 D. Kuzmin and S. Turek, Flux correction tools for finite elements. J. Comput. Phys., 175, 525-558 (2002).   DOI   ScienceOn
11 B. E. Launder and D. B. Spalding, The numerical computation of turbulent flows, Comp. Meth. Appl. Meth. Eng., 3, 269-289 (1974).   DOI   ScienceOn
12 S. Judd, The MBR Book: Principles and Applications of Membrane Bioreactors in Water and Wastewater Treatment, 90-101, Elsevier Science, Oxford, UK (2008).
13 I. H. Cho and J. T. Kim, Trends in the technology and market of membrane bioreactors (MBR) for wastewater treatment and reuse and development rirections, Membrane J., 23, 24-44 (2013).
14 W. L. McCabe, J. C. Smith, and P. Harriott, Unit Operations of Chemical Engineering, 7th ed., 51-58, McGraw-Hill, New York, USA (2001).
15 F. L. Wattendorf and A. M. Kuethe, Investigations on turbulent flow by means of the hot-wire anemometer, Physics, 5, 153 (1934).   DOI