Numerical Modeling of Sedimentation Tanks

Imam, Emad; McCorquodale, John A.; Bewtra, Jatinder K.

doi:10.1061/(asce)0733-9429(1983)109:12(1740)

Cited by 103 publications

(29 citation statements)

References 9 publications

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“…When examining SSTs performance, it is important to consider the non-Newtonian (rheological) and settling behaviour of activated sludge because they have significant impacts on the overall transport and removal of solids (Ekama et al, 1997;Lakehal et al, 1999;De Clercq, 2003). To predict the internal flow field and solids distribution, complex computational fluid dynamics (CFD) models of SSTs have been developed (Larsen, 1977;Imam et al, 1983;Dahl, 1993). CFD models are based on the NaviereStokes equations and are computationally demanding.…”

Section: Introductionmentioning

confidence: 99%

A new settling velocity model to describe secondary sedimentation

et al. 2014

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Section: Introductionmentioning

confidence: 99%

A new settling velocity model to describe secondary sedimentation

et al. 2014

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“…With respect to primary sedimentation tank, where the solids concentration is limited and discrete settling prevails, Imam et al [10] applied a fixed settling velocity and used an averaged particle velocity. Stamou et al [11] simulated the flow in a primary sedimentation tank using a 2D model in which the momentum and solid concentration equations were solved but not linked to account for buoyancy.…”

Section: Introductionmentioning

confidence: 99%

A CFD methodology for the design of sedimentation tanks in potable water treatment

Goula

Kostoglou

Karapantsios

et al. 2008

Chemical Engineering Journal

119

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“…Finite difference or finite element [16] techniques are used for the numerical solution of the flow and SS equations. Some of the models employ a simple constant eddy diffusivity assumption [11], while others use a more refined turbulence model, e.g. the k-e model [14].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of flow and settling in primary rectangular clarifiers

Stamou

Adams

Rodi

1989

Journal of Hydraulic Research

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A numerical model is presented for simulating the flow and the settling performance of primary clarifiers. The model consists of 2 parts: a flow model providing the velocity and turbulent viscosity/diffusivity field and a suspended-sediment transport model for determining the particle concentration field. The model is an improvement over simple algebraic relations and previous numerical models because, with the aid of the k-e turbulence model employed, it allows a more realistic prediction of the velocity and turbulent diffusivity distribution, and also because it accounts for differential settling by solving concentration equations for individual fractions of different particle sizes. The model is applied to calculate the flow field, the flow through curve and the suspended solids concentration field in the primary settling tank of the City of Sarnia, Ontario, Canada for various overflow rates and settling velocity curves. In spite of the geometric simplifications employed in the model the concentration profiles and removal efficiencies are in very good agreement with measurements, while the agreement about the flow field and the flow-through-curve is more qualitative. The calculations were carried out both on a personal and a Siemens 7881 main frame computer, and the ratio of computing times was found to be 1:150. RESUME L'article présente un modèle numérique simulant fécoulement et la capacité de sedimentation de décan-teurs primaires. Le modèle comprend deux parties: tout d'abord un modèle d'écoulement donnant Ie champ des vitesses, des viscosités turbulentes et de diffusion des matières en suspension, et en second lieu un modèle de transport en suspension pour calculer le champ de concentration en matières solides. Ce modèle constitue en progrès par rapport aux simples relations algébriques et aux modèles numériques antérieurs parce que, d'une part il donne une prediction plus réaliste des vitesses et de la diffusion turbulente grace a femploi du modèle k-s de turbulence, et d'autre part il prend en compte une décantation selective des particules en résolvant les equations de concentration séparément pour différentes classes granulo-* Present address: Downloaded by [JAMES COOK UNIVERSITY] at 04:40 17 March 2015métriques. Le modèle est utilise pour calculer Ie champ de vitesses, la courbe d'évülution de la concentration en fonction du temps (FTC) et le champ de concentration des particules en suspension dans le cas du bassin de décantation primaire de la vil le de Sarnia dans ['Ontario, au Canada, pour différentes valeurs du débit traite et des vitesses de chute de particules en suspension. Malgré les schématisalions de geometrie adoptées dans le modèle, les profils de concentration et les taux de décantation calculés sont tout a fait compatibles aux mesures, tandis que le champ de vitesses et la courbe d'évolution de la concentration en fonction du temps (FTC) ne sont obtenus que qualitative ment. Les calculs ont été effect ués a la Ibis sur un IBM-PC et sur un calculateur SIEMFNS 7881, les temps de calcul é...

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Numerical Modeling of Sedimentation Tanks

Cited by 103 publications

References 9 publications

A new settling velocity model to describe secondary sedimentation

A new settling velocity model to describe secondary sedimentation

A CFD methodology for the design of sedimentation tanks in potable water treatment

Numerical modeling of flow and settling in primary rectangular clarifiers

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