Effect of Dissolved Oxygen on Oxic/Anoxic Diauxic Lag of P. denitrificans
Publication: Journal of Environmental Engineering
Volume 128, Issue 4
Abstract
Nitrogen is removed in suspended growth wastewater treatment systems by passing mixed liquor from an aerobic zone in which nitrification takes place to an anoxic zone in which denitrification takes place. Following the switch from oxygen to nitrate as terminal electron acceptor, a diauxic lag may occur. The present study tested the hypothesis that lower dissolved oxygen concentrations in the aerobic phase lead to shorter diauxic lags. Bacterial cultures exposed to low dissolved oxygen concentrations (<0.70 mg/L) during the aerobic growth phase had significantly shorter diauxic lags than cultures grown at air saturation. Furthermore, these cultures generally grew faster during the anoxic phase. These results indicate that the effect of dissolved oxygen concentration in aerobic reactors on diauxic lags and anoxic growth rates in anoxic reactors should be considered in the design and operation of nitrogen-removing, suspended growth biological treatment processes.
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Information
Published In
Journal of Environmental Engineering
Volume 128 • Issue 4 • April 2002
Pages: 391 - 394
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Apr 16, 2001
Accepted: Sep 21, 2001
Published online: Apr 1, 2002
Published in print: Apr 2002
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