OLS : Record


Main Title Hydraulic characteristics of activated sludge secondary clarifiers /
Author Bender, Jon.
Publisher U.S. Environmental Protection Agency, Municipal Environmental Research Laboratory : Center for Environmental Research Information [distributor],
Place Published Cincinnati, Ohio
Year Published 1984
Report Number EPA-600/S 2-84-131
OCLC Number 11577794
Subject Added Ent Sewage sludge.; Sewage clarifiers.
Internet Access
Description Access URL
Library   Call Number Additional Info Location Date Modified
EJBD ARCHIVE EPA 600-S2-84-131 Headquarters Library/Washington,DC 04/06/2010
Collation 6 p. : ill. ; 28 cm.
Notes Caption title. At head of title: Project summary. Distributed to depository libraries in microfiche. "Sept. 1984." "EPA-600/S2-84-131."
Contents Notes "The hydraulic characteristics of several common types of full-scale activated sludge secondary clarifiers were evaluated. Attempts were then made to modify and improve representative examples. The tanks' characteristics were inferred by the use of innovative dye tracer techniques. The effects of modifications were evaluated on the basis of effluent quality. The dominant hydraulic characteristic of all clarifiers studied was density flow. In most cases, the density flow had a significant effect on effluent suspended solids concentrations. When effluent weirs were placed in the path of density flow, effluent quality was generally poor. Preventing density current formation by inlet modification was not nearly as effective as interrupting flows at midradius and near the weirs. Problems also occurred with balancing flows between parallel clarifiers. The cause was improper application of mixed liquor feed valves, poor splitter box design, and inadequate flow measurement. In addition, strong evidence exists that flow transients are not attenuated by upstream unit processes and may significantly affect the solids transport through clarifiers."
Access Notes Also available via the World Wide Web.
Author Added Ent
Crosby, Robert M.
Corporate Au Added Ent Municipal Environmental Research Laboratory.
PUB Date Free Form 1984
BIB Level m
OCLC Time Stamp 20100402124422
Cataloging Source OCLC/T
Language eng
SUDOCS Number EP 1.89/2:600/S 2-84-131
Origin OCLC
Type CAT
OCLC Rec Leader 02473nam 2200361Ia 45020