Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Operational Control Procedures for the Activated Sludge Process. Part III-B. Calculation Procedures for Step-Feed Process Responses.
Author West., Alfred W. ;
CORP Author National Field Investigations Center-Cincinnati, Ohio.;Environmental Protection Agency, Washington, D.C. Office of Enforcement and General Counsel.
Year Published 1975
Report Number EPA/330/9-74/001e;
Stock Number PB-258 268
Additional Subjects Activated sludge process ; Sewage treatment ; Aeration ponds ; Flow control ; Flow rate ; Process variables ; Settling ; Clarification ; Pressure ; Computations ; Formulas(Mathematics) ; Oxidation ; Mixing ;
Library Call Number Additional Info Location Last
NTIS  PB-258 268 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 37p
Treatment plants at which operators can switch wastewater in-flow from one bay of an aeration tank to one or more other bays (step-feeding) have additional ways to meet the process demands of the activated sludge system. Recognition of the process demands that call for such control changes and knowledge of what happens when step-feeding is employed provide the foundation for successful operation of such plants. The curves on Figure 1 show how shifting wastewater in-flow locations exerts forces on mixed liquor sludge oxidation that are opposite to those exerted on wastewater treatment. Knowledge of these facts alone permits operators to shift step control in the proper direction to correct sludge or final effluent deficiencies and to restore best process balance.