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Oxygen Transfer Efficiency in Deep Tanks

Frank L. Schmit and David T. Redmon
Journal (Water Pollution Control Federation)
Vol. 47, No. 11 (Nov., 1975), pp. 2586-2598
Stable URL: http://www.jstor.org/stable/25038415
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Oxygen Transfer Efficiency in Deep Tanks
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Abstract

Present requirements for higher degrees of treatment, coupled with high land, construction, and power costs, have stimulated interest in the possible economies of deeper aeration tanks and higher loadings. A test tank was built 34.33 ft (10.464 m) wide × 6 ft (1.829 m) long × 24 ft (7.315 m) deep to explore the relationship of oxygen transfer efficiency and power and air requirements to submergence by using a wide-band aeration system. The range of transfer rates investigated corresponds to a biochemical oxygen demand loading in the range of 20 to 260 lb/day/1,000 cu ft. Methods and techniques in the measurement of transfer efficiencies were also evaluated. A comparison is made to show the variation in efficiencies depending on assumptions made or parameters used in reporting data. It is recommended that aeration equipment be evaluated in terms of transfer capability rather than by percentage oxygen absorption. Tests showed increased oxygen transfer capability at decreased power as submergence increased.

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