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Received March 11, 2009
Accepted June 11, 2009
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Shape effect on optimal geometric conditions in surface aeration systems
Department of Civil Engineering, Indian Institute of Technology, Guwahati, India 1Department of Civil Engineering, Indian Institute of Science, Bangalore 560012, India
bimk@iitg.ernet.in
Korean Journal of Chemical Engineering, January 2010, 27(1), 159-162(4), 10.1007/s11814-009-0302-8
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Abstract
The performance of surface aeration systems, among other key design variables, depends upon the geometric parameters of the aeration tank. Efficient performance and scale up or scale down of the experimental results of an aeration system requires optimal geometric conditions. Optimal conditions refer to the conditions of maximum oxygen transfer rate, which assists in scaling up or down the system for commercial utilization. The present work investigates the effect of an aeration tank's shape (unbaffled circular, baffled circular and unbaffled square) on oxygen transfer. Present results demonstrate that there is no effect of shape on the optimal geometric conditions for rotor position and rotor dimensions. This experimentation shows that circular tanks (baffled or unbaffled) do not have optimal geometric conditions for liquid transfer, whereas the square cross-section tank shows a unique geometric shape to optimize oxygen transfer.
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Ciofalo M, Brucato A, Grisafi F, Torraca N, Chem. Eng. Sci., 51(14), 3557 (1996)
Kozinski AA, King CJ, AIChE J., 12, 109 (1966)
American Society of Civil Engineers, ASCE standard - measurement of oxygen transfer in clean water, American Society of Civil Engineers, New York (1993)
Cleasby JL, Baumann ER, J. Water Pollut. Contr. Fed., 40, 412 (1968)
Rao ARK, Laxmi US, Optimal Geometric Shape of a Surface Aeration Tank, Proceedings of the north american water and environment congress & destructive water, 800-5 (1996)
Takase H, Unno H, Akehata T, Int. Chem. Eng., 24, 128 (1984)
Rao ARK, Journal of Environmental Engineering, ASCE, 125, 215 (1999)
Rao AR, Kumar B, Biotechnol. Bioeng., 96(3), 464 (2007)
Rao AR, Kumar B, Korean J. Chem. Eng., 25(6), 1338 (2008)
Rushton JH, Costich EW, Everett HJ, Chem. Eng. Progr., 9, 395 (1950)
Kozinski AA, King CJ, AIChE J., 12, 109 (1966)
Nagata S, Mixing principles and applications, John Wiley & Sons (1975)
Zlokarnik M, Dimensional analysis and scale-up in chemical engineering, Springer Verlag, New York (1991)
Forrester SE, Rielly CD, Carpenter KJ, Chem. Eng. Sci., 53(4), 603 (1998)
Rao ARK, Laxmi BVB, Narasiah KS, Water Qual. Res. J. Canada, 39, 273 (2004)
Rao AR, Kumar B, Chem. Eng. Technol., 31(2), 287 (2008)
Metcalf and Eddy Inc., Wastewater engineering: treatment and reuse, Tata McGraw-Hill, New Delhi (2003)
Udayasimha L, Experimental studies on oxygen transfer by surface aeration, PhD Thesis, IISc, Bangalore (1991)
Schmidtke NW, Horvath I, Progress Water Technology, 9, 477 (1977)
Lu WM, Wu HZ, Chou CY, Korean J. Chem. Eng., 16(5), 703 (1999)
Cho HB, Park YH, Korean J. Chem. Eng., 20(2), 262 (2003)
Johnstone RE, Thring MW, Pilot plants models and scaleutp methods in chemical engineering, McGraw-Hill Book Co., Inc., New York (1957)
Mietzner AB, Pigford RL, Scale-up in practice, edited by Fleming R, Reinhold Publishing Co., New York, USA (1958)
Mishra VP, Joshi JB, Chem. Eng. Res. & Des., 71, 563 (1993)
