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A Note on Oxygen Sag Equations

Jon C. Liebman and Daniel P. Loucks
Journal (Water Pollution Control Federation)
Vol. 38, No. 12 (Dec., 1966), pp. 1963-1967
Stable URL: http://www.jstor.org/stable/25035693
Page Count: 5
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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.
A Note on Oxygen Sag Equations
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Abstract

An examination of the Streeter-Phelps equation and recently published modified oxygen-sag equations shows that in both cases there is a limiting value of critical time, approached as initial BOD increases without bound. In the Streeter-Phelps formulation this limit is a maximum; critical time increases toward the limit with increasing initial BOD concentrations. In the modified equations, however, the limiting critical time may be either a minimum or a maximum, depending on values of the other parameters of the equations. The conditions under which the limiting critical time is maximum or minimum are given, together with some other interesting and useful properties of the limit.

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