Automatic Dissolved Oxygen Control

by Michael J. Flanagan, Principal; Flanagan and Associates, San Francisco, Calif.,
Joseph F. Roesler, (M.ASCE), San. Engr.; Environmental Research Lab., Environmental Protection Agency, Cincinnati, Ohio,
Brian D. Bracken, Sr. Engr.; Brown and Caldwell, Walnut Creek, Calif.,

Serial Information: Journal of the Environmental Engineering Division, 1977, Vol. 103, Issue 4, Pg. 707-722

Document Type: Journal Paper


A manual describing design procedures and guidelines for the selection of aeration equipment and dissolved oxygen (DO) control systems for activated sludge treatment plants is summarized. Aeration methods, equipment, and application techniques are examined and selection procedures presented. Various DO control systems are described with recommendations for system applications to various aeration equipment types and process configurations. Automatic DO control systems are presented for various size hypothetical activated sludge plants. Finally, the economics of manual and automatic DO control systems are explored using data derived from a study of 12 operating activated sludge plants. The conclusion is drawn that the capital and operating cost of automatic DO control systems is justified for activated sludge plants larger than 1 mgd, provided equipment is selected and applied in accordance with the guidelines of the design manual and a power cost equal to or greater than the national average power rate is applicable.

Subject Headings: Control systems | Dissolved oxygen | Equipment and machinery | Activated sludge | Power plants | Aeration | Automation | Economic factors

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