Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Underflow geometry in secondary sedimentation
ABSTRACT: Previous work by the authors suggested that activated sludge sedimentation might be highly sensitive to underflow geometry. Field, physical model, and stratified flow numerical model tests were conducted to evaluate this hypothesis. Field work included solids settling velocity, dye dispersion, and flow pattern/solids distribution tests. Physical tests included operation of a pie‐shaped 1:12.5 scale model of a circular, center‐feed tank with sludge withdrawal simulating countercurrent, uniform, and cocurrent geometries. A stratified flow numerical model that simulated the effects of density currents was calibrated to the results of the full‐scale testing. The results failed to confirm the experimental hypothesis. Model performance was relatively insensitive to underflow geometry in a circular tank when density effects were simulated.
Underflow geometry in secondary sedimentation
ABSTRACT: Previous work by the authors suggested that activated sludge sedimentation might be highly sensitive to underflow geometry. Field, physical model, and stratified flow numerical model tests were conducted to evaluate this hypothesis. Field work included solids settling velocity, dye dispersion, and flow pattern/solids distribution tests. Physical tests included operation of a pie‐shaped 1:12.5 scale model of a circular, center‐feed tank with sludge withdrawal simulating countercurrent, uniform, and cocurrent geometries. A stratified flow numerical model that simulated the effects of density currents was calibrated to the results of the full‐scale testing. The results failed to confirm the experimental hypothesis. Model performance was relatively insensitive to underflow geometry in a circular tank when density effects were simulated.
Underflow geometry in secondary sedimentation
Samstag, Randal W. (Autor:in) / Dittmar, David F. (Autor:in) / Vitasovic, Zdenko (Autor:in) / McCorquodale, J. Alex (Autor:in)
Water Environment Research ; 64 ; 204-212
01.05.1992
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
activated sludge , sedimentation , underflow , clarifiers , design , modeling , simulation
| Springer Verlag | 2019
| British Library Online Contents | 2004
| Online Contents | 2004