Optimal Geometric Shape of a Surface Aeration Tank

by Achanta Ramakrishna Rao,
U.S Laxmi,



Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water

Abstract: This paper presents the results of a laboratory investigation on three cross-sectional shapes—square, rectangular and circular of surface aeration tanks, without any baffles, to find out which shape is optimal to produce maximum oxygen transfer coefficient, kLa20, for a given input power to the rotor per unit volume of water, PS/V. It is found that the optimal shape of tank is circular, followed by rectangular shapes of length to breadth ratios of 1.5 and 2 and the least one is the square shape. It is also established that kLa20, (where D is the diameter of the rotor) is uniquely related to Ps/V for any size of tank of a given shape.

Subject Headings: Aeration | Wastewater treatment | Hydro power | Cross sections | Water tanks | Baffles (hydraulic) | Oxygen transfer | Cylindrical tanks

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