Surface aeration systems are the most energy extensive unit. It is essential that the design of aeration systems should be as near optimal as is possible. Here, geometry of the aeration tank imparts a major effect on the system efficiency. Therefore, it is essential to have the optimal geometric conditions for the aeration tank. Optimal geometric conditions are also needed to scale up the laboratory result to the field installation. In the present work, experimental and numerical studies have been carried out on the effect of geometric parameters on oxygen transfer and macromixing time scale in baffled circular surface aeration tank to ascertain the optimal geometric conditions. Optimal geometric conditions developed in the present work may be useful in the field installation of the present systems.

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