Of: Winter Temperature Gradients in Circular Clarifiers, S.A. Wells, D.M. LaLiberte

Gerges, Hany; McCorquodale, John A.

doi:10.2175/106143000x137428

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“…Since the influent to the SST is a high concentration of mixed liquor suspended solids (MLSS), the flow in SSTs is driven by density. However, since the causes of density currents were controversial (Taebi‐harandy & Schroeder, ), many early CFD research studies from 1990s to early 2000s focused on the study of the density currents (Gerges & McCorquodale, ; Godo & McCorquodale, ; Lyn, Stamou, & Rodi, ; McCorquodale et al, ; Moursi, McCorquodale, & El‐Sebakhy, ; Vitasovic et al, ). Moursi et al () suggested that the density currents (bottom or surface) may occur from the temperature difference, concentration effects, and the release of gas bubbles.…”

Section: Applications Of Cfd Modeling Research and Engineering Practicementioning

confidence: 99%

“…Moursi et al () suggested that the density currents (bottom or surface) may occur from the temperature difference, concentration effects, and the release of gas bubbles. Also, Gerges and McCorquodale () concluded that there were two types of thermal density currents in SSTs: (a) heat exchange between water surface and the surroundings and (b) temperature variance between the influent and ambient water. Both effects may occur at the same time.…”

Section: Applications Of Cfd Modeling Research and Engineering Practicementioning

confidence: 99%

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Development and applications in computational fluid dynamics modeling for secondary settling tanks over the last three decades: A review

Gao

Stenstrom

2019

Water Environment Research

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Secondary settling tanks (SSTs) are a crucial process that determines the performance of the activated sludge process. However, their performance is often far from satisfactory. In the last 30 years, computational fluid dynamics (CFD) has become a robust and cost-efficient tool for designing new SSTs, modifying the geometries of existing SSTs and improved control techniques in wastewater treatment plants. The first part of this review paper discusses the different approaches to model the motion of particles in SSTs. The applications of different multiphase approaches and the widely applied single-phase approach in different SST studies are reviewed. The second part reviews current CFD research and engineering practice, focusing on the formation and the effect of density currents, effects of different design variables, parameter uncertainties in modeling structures, and atmospheric conditions. Finally, challenges and future improvements of sub-models (sludge settling, rheology, turbulence, and flocculation) in the SST model framework are identified. • Practitioner points• The first journal review for the CFD applications in SSTs over the last decade. • The controversy over the relationship between SOR and SST performance can be largely explained by the prediction of the CFD model. • Density decoupling in the turbulence model is possible for well-baffled SSTs. • The relative importance of three modeling parameters is summarized. • Recommendations for future data collection are provided. • Key wordscomputational fluid dynamics; density-driven flow; secondary settling tank; wastewater treatment

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Section: Applications Of Cfd Modeling Research and Engineering Practicementioning

confidence: 99%

Section: Applications Of Cfd Modeling Research and Engineering Practicementioning

confidence: 99%

Development and applications in computational fluid dynamics modeling for secondary settling tanks over the last three decades: A review

Gao

Stenstrom

2019

Water Environment Research

View full text Add to dashboard Cite

show abstract

Of: Winter Temperature Gradients in Circular Clarifiers, S.A. Wells, D.M. LaLiberte

Cited by 1 publication

References 0 publications

Development and applications in computational fluid dynamics modeling for secondary settling tanks over the last three decades: A review

Development and applications in computational fluid dynamics modeling for secondary settling tanks over the last three decades: A review

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