Underflow geometry in secondary sedimentation: Fid-Bau Portal

Fachinformationsdienst BAUdigital

A platform for research: civil engineering, architecture and urbanism

Underflow geometry in secondary sedimentation

Samstag, Randal W. / Dittmar, David F. / Vitasovic, Zdenko / McCorquodale, J. Alex

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.

Access

Check availability in my library

Order at Subito €

Page navigation

Document information

Export, share and cite

Underflow geometry in secondary sedimentation

Samstag, Randal W. / Dittmar, David F. / Vitasovic, Zdenko / McCorquodale, J. Alex

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. / Dittmar, David F. / Vitasovic, Zdenko / McCorquodale, J. Alex

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.

Access

Check availability in my library

Order at Subito €

Page navigation

Document information

Export, share and cite

Document information

Title:

Underflow geometry in secondary sedimentation

Contributors:

Samstag, Randal W. (author) / Dittmar, David F. (author) / Vitasovic, Zdenko (author) / McCorquodale, J. Alex (author)

Published in:

Water Environment Research ; 64 ; 204-212

Publication date:

1992-05-01

Size:

9 pages

ISSN:

1554-7531 , 1061-4303

DOI:

https://doi.org/10.2175/WER.64.3.3

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

activated sludge , sedimentation , underflow , clarifiers , design , modeling , simulation

Similar titles

Discussion of: Underflow geometry in secondary sedimentation, R. W. Samstag et al, 64, 204 (1992).

Stahl, James F. / Chen, Ching‐Lin / Wahlberg, Eric J. | Wiley | 1993

Underflow Gates

James, C S | Springer Verlag | 2019

Modeling a Plunging Underflow

Dallimore, C. J. / Imberger, J. / Hodges, B. R. | British Library Online Contents | 2004

Modeling a Plunging Underflow

Dallimore, Chris J. | Online Contents | 2004

Closure to Discussion of: Underflow geometry in secondary sedimentation, R. W. Samstag et al., 64, 204 (1992); Discussion by J. F. Stahl et al., 65, 281 (1993).

Samstag, Randal W. | Wiley | 1993