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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 ;
Library Call Number Additional Info Location Last
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