Gas Transfer Kinetics of Pure Oxygen System

by James A. Mueller, (A.M.ASCE), Res. Engr.; Hydroscience, Inc., Westwood, NJ,
Thomas J. Mulligan, (A.M.ASCE), Principal; Hydroscience, Inc., Westwood, NJ,
Dominic M. Di Toro, (A.M.ASCE), Sr. Res. Engr.; Hydroscience, Inc., Westwood, NJ,

Serial Information: Journal of the Environmental Engineering Division, 1973, Vol. 99, Issue 3, Pg. 269-282

Document Type: Journal Paper


A mathematical model is described which determines the gas and liquid phase of oxygen, nitrogen, and carbon dioxide concentrations along with the variation in gas flow and pH in a completely mixed, staged, pure oxygen system. Model verification was accomplished using existing field data. The model was then utilized to determine the effects of varying BOD loads and alkalinities on a previously designed system. Lower waste-water alkalinities and pHs not only resulted in lower mixed liquor pH values, but also lower dissolved oxygen concentrations. The respiratory quotient was seen to have a significant effect on the system. To obtain a desired DO level, the trade-off between increasing gas flow and aerator horsepower is presented.

Subject Headings: Gas flow | Mathematical models | pH | Kinetics | Oxygen transfer | Field tests | Alkalinity | Dissolved oxygen

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