Main Title |
Hydraulic characteristics of activated sludge secondary clarifiers / |
Author |
Bender, Jon.
|
Other Authors |
|
Publisher |
U.S. Environmental Protection Agency, Municipal Environmental Research Laboratory : Center for Environmental Research Information [distributor], |
Year Published |
1984 |
Report Number |
EPA/600-S2-84-131 |
OCLC Number |
11577794 |
Subjects |
Sewage sludge ;
Sewage clarifiers
|
Internet Access |
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
EJBD |
EPA 600-S2-84-131 |
In Binder |
Headquarters Library/Washington,DC |
11/05/2018 |
ELBD ARCHIVE |
EPA 600-S2-84-131 |
In Binder Received from HQ |
AWBERC Library/Cincinnati,OH |
10/04/2023 |
|
Collation |
6 pages : illustrations ; 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." |