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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
J. R. McWhirter, J. Chern and J. C. Hunter, Ind. Eng. Chem. Res., 34, 2644 (1995).
R. Fuchs, D. Ryu and A. E. Humphery, Ind. Eng. Chem. Process Des. Dev., 10, 190 (1971).
W. S. Hu, J. Meier and D. I. C. Wang, Biotech. Bioeng., 28, 122 (1986).
M. Ciofalo, A. Brucato, F. Grisafi and N. Torrace, Chem. Eng. Sci., 51,14, 3557 (1996).
A. A. Kozinski and C. J. King, 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).
J. L. Cleasby and E. R. Baumann, J. Water Pollut. Contr. Fed., 40, 412 (1968).
A. R. K. Rao and U. S. Laxmi, Optimal Geometric Shape of a Surface Aeration Tank, Proceedings of the north american water and environment congress & destructive water, 800–805 (1996).
H. Takase, H. Unno and T. Akehata, Int. Chem. Eng., 24, 128 (1984).
A. R. K. Rao, Journal of Environmental Engineering, ASCE, 125(3), 215 (1999).
A. R. K. Rao and B. Kumar, Biotech. Bioeng., 96, 464 (2007).
A. R. K. Rao and B. Kumar, Korean J. Chem. Eng., 25, 1338 (2008).
J. H. Rushton, E. W. Costich and H. J. Everett, Chem. Eng. Progr., 9, Part I: 395 (1950).
A. A. Kozinski and C. J. King, AIChE J., 12, 109 (1966).
S. Nagata, Mixing principles and applications, John Wiley & Sons (1975).
M Zlokarnik, Dimensional analysis and scale-up in chemical engineering, Springer Verlag, New York (1991).
S. E. Forrester, C. D. Rielly and K. J. Carpenter, Chem. Eng. Sci., 53, 603 (1998).
A. R. K. Rao, B. V. B. Laxmi and K. S. Narasiah, Water Qual. Res. J. Canada, 39, 273 (2004).
A. R. K. Rao and B. Kumar, Chem. Eng. Technol., 31(2), 287 (2008).
Metcalf and Eddy Inc., Wastewater engineering: treatment and reuse, Tata McGraw-Hill, New Delhi (2003).
L Udayasimha, Experimental studies on oxygen transfer by surface aeration, PhD Thesis, IISc, Bangalore (1991).
N. W. Schmidtke and I. Horvath, Progress Water Technology, 9, 477 (1977).
W. Lu, H. Wu and C. Chou, Korean J. Chem. Eng., 16, 703 (1999).
H. Cho and Y. Park, Korean J. Chem. Eng., 20, 262 (2003).
R. E. Johnstone and M. W. Thring, Pilot plants models and scaleutp methods in chemical engineering, McGraw-Hill Book Co., Inc., New York (1957).
A. B. Mietzner and R. L. Pigford, Scale-up in practice, edited by R. Fleming, Reinhold Publishing Co., New York, USA (1958).
V. P. Mishra and J. B. Joshi, Chem. Eng. Res. & Des., 71, 563 (1993).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kumar, B., Patel, A.K. & Rao, A.R. Shape effect on optimal geometric conditions in surface aeration systems. Korean J. Chem. Eng. 27, 159–162 (2010). https://doi.org/10.1007/s11814-009-0302-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11814-009-0302-8