Main Title |
Density Currents in Activated Sludge Secondary Clarifiers. |
Author |
Bender, J. H. ;
|
CORP Author |
Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab. |
Year Published |
1988 |
Report Number |
EPA/600/2-88/006; |
Stock Number |
PB88-155312 |
Additional Subjects |
Clarification ;
Activated sludge process ;
Sewage treatment ;
Density(Mass/volume) ;
Mixing ;
Currents ;
Velocity ;
Solids ;
Settling ;
Weirs ;
Quality control ;
Reviews ;
Intake systems ;
Baffles ;
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB88-155312 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
73p |
Abstract |
Density currents form in activated sludge secondary clarifiers because the mixed liquor has a density greater than the treated wastewater in the clarifier. This causes the mixed liquor to plunge to the bottom of the clarifier establishing relatively high velocity currents within the clarifier that can transport settled solids out of the clarifier in the effluent. The report reviews the literature relative to density current formation, methods available for control and their effectiveness in minimizing the impact of density current on activated sludge secondary clarifier effluent quality. Control procedures reviewed include inlet structures, weir length and placement and in-tank baffles. |
PUB Date Free Form |
Jan 88 |
Category Codes |
68D |
NTIS Prices |
PC A04/MF A01 |
Primary Description |
600/14 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
808423577 |
Origin |
NTIS |
Type |
CAT |