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Main Title Effects of flow equalization on the operation and performance of an activated sludge plant /
Author Foess, Gerald W. ; Meenahan, James G. ; Blough., David
Other Authors
Author Title of a Work
Meenahan, James G.
Blough, David.
CORP Author Ypsilanti Township, Mich.;Johnson and Anderson, Inc., Pontiac, Mich.;Municipal Environmental Research Lab., Cincinnati, Ohio. Wastewater Research Div.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, Municipal Environmental Research Laboratory,
Year Published 1977
Report Number EPA/600-2-77-138; EPA-S-801985
Stock Number PB-272 657
OCLC Number 41713494
Subjects Hydraulic control ; Sewage--Purification--Activated sludge process ; Sewage disposal--Michigan--Ypsilanti
Additional Subjects Flow control ; Activated sludge process ; Sewage treatment ; Concentration(Composition) ; Flow rate ; Process charting ; Design criteria ; Equipment ; Sampling ; Performance evaluation ; Nutrients ; Mass flow ; Tables(Data) ; Michigan ; Cost analysis ; Ypsilanti Township(Michigan)
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 600-2-77-138 Headquarters Library/Washington,DC 10/26/2011
EJBD  EPA 600-2-77-138 c.1 Headquarters Library/Washington,DC 03/10/2014
ELBD RPS EPA 600-2-77-138 repository copy AWBERC Library/Cincinnati,OH 10/17/2014
ESAD  EPA 600-2-77-138 Region 10 Library/Seattle,WA 07/31/2017
NTIS  PB-272 657 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation xi, 96 pages ; 28 cm.
A plant-scale research program was carried out for more than a year to evaluate the impact of flow equalization on the 14,000 cu m/day (3.7 mgd) upgraded activated sludge plant at Ypsilanti Township, Michigan. Process streams were characterized under both equalized and unequalized flow conditions with respect to BOD, COD, TSS and forms of nitrogen and phosphorus. The equalization system was effective in leveling influent diurnal flow variations but was limited in its ability to dampen variations in wastewater concentration and mass flux. Some biochemical action apparently occurred in the equalization basin, although BOD removal was marginal and inconsistent. Analysis of secondary effluent indicated that plant performance was similar with and without equalized flow, suggesting that the theoretical advantages of flow equalization may not be achieved in manually controlled plants. An examination of theoretical power costs for equalized and unequalized flow conditions indicated that the use of flow equalization did not result in power cost economies.
"EPA/600-2-77-138." "August 1977." EPA grant no. S 801985 ; EPA project officer: Ben W. Lykins, Jr.