Simulating disinfection processes in chlorine contact tanks using various turbulence models and high-order accurate difference schemes

Wang, Hong; Falconer, Roger Alexander

doi:10.1016/s0043-1354(98)80014-6

Cited by 55 publications

(29 citation statements)

References 119 publications

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“…However, tracer behavior depends mainly on momentum, raising the need to couple transport equations. Early efforts provided two-dimensional analysis of momentum and tracer transport using finite differences method with appropriate discretization stencils [16,31,32]. With the use of commercial CFD tools and powerful mesh generation software, the analysis of contact tanks entered a new era with unlimited possibilities of tank design.…”

Section: Cfd Modelingmentioning

confidence: 99%

“…The peak is immediately followed by a second peak related to the distribution of the remainder of the tracer. As the flow rate is decreased, the tail of the distribution spreads in time with small tracer mass fraction recorded after 60,000 sec for a flow Dimensionless flow times are grouped in Table 2 16 …”

Section: Rectangular Tankmentioning

confidence: 99%

“…A proper disinfection tank design has to ensure a suitable contact time in order to inactivate most of the microorganisms without the formation of by-products. Several investigations have been carried out to evaluate contact tank design and efficiency [13][14][15][16][17][18]. It has been shown that throughput of contact tanks can be improved by simple geometrical modifications, such as the 3 insertion of baffles or guiding walls [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Spiral-shaped reactor for water disinfection

Soukane

Ait-Djoudi

Naceur

et al. 2016

Desalination and Water Treatment

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Chlorine based processes are still widely used for water disinfection. The disinfection process for municipal water consumption is usually carried out in large tanks, specifically designed to verify several hydraulic and disinfection criteria. The hydrodynamic behavior of contact tanks of different shapes, each with an approximate total volume of 50,000 m 3 , was analyzed by solving turbulent momentum transport equations with a computational fluid dynamics (CFD) code, namely ANSYS fluent. Numerical experiments of a tracer pulse were performed for each design to generate flow through curves and investigate species residence time distribution for different inlet flow rates, ranging from 3 m 3 ·s -1 to 12 m 3 ·s -1 . A new nature inspired Conch tank design of which shape follows an Archimedean spiral was then developed. The spiral design is shown to strongly outperform the other tanks designs for all the selected plug flow criteria with an enhancement in efficiency, less short-circuiting and an order of magnitude improvement in mixing and dispersion. Moreover, following the intensification philosophy, after 50% reduction of its size, the new design retains its properties and still gives far better results than the classical shapes.

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Section: Cfd Modelingmentioning

confidence: 99%

Section: Rectangular Tankmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spiral-shaped reactor for water disinfection

Soukane

Ait-Djoudi

Naceur

et al. 2016

Desalination and Water Treatment

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“…Typically, the K-Epsilon model has been applied for the CFD simulation of water treatment flow [7,16,17]. An immediate benefit of the realizable K-Epsilon model is that it more accurately predicts the spreading rate of both planar and round jets.…”

Section: Simulationmentioning

confidence: 99%

Evaluation of the effect of baffle shape in flocculation basin on hydrodynamic behavior using computational fluid dynamics

Cho¹,

Yoo²,

Yoo³

et al. 2010

Korean J. Chem. Eng.

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This study on the party wall of a flocculation basin provides important ground to facilitate the inducement of uniformity in the rectangular sedimentation basin and to achieve an improvement in sedimentation efficiency. In the water treatment plant used for this study, perforated baffle type, square type, pillar type and downward rectangular type partitions have been applied. We evaluated the hydrodynamic behavior of several types of party walls in the flocculation basin by using computational fluid dynamics (CFD). The perforated baffle type demonstrates more effective output for uniform flow than the square type, and the third party wall of the flocculation process has the most influence of the three party walls for water flow distribution. To prevent sinking of the flocs formed between the third party wall and the final outlet wall, it is necessary to develop the third party wall into an actual final outlet wall or to modify it into a pillar baffle type. In the case of a drinking water treatment system that treats low density water, a perforated baffle is more efficient as the final outlet wall because a downward rectangular type may form a bottom flow, which may cause a reduction in the efficiency of the volume capacity.

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“…In this section the details of the contact problem are described and in subsequent sections this dataset will be used to perform numerical experiments. Wang and Falconer [23] developed a two dimensional finite difference model of the flow and transport in order to investigate transport of a tracer. They focused primarily on resolving the fluid flow with different turbulence models, concluding that solute transport predictions depends on the accuracy of the hydrodynamics.…”

Section: Application To a Model For Transport In A Contact Tank Reactormentioning

confidence: 99%

Optimization under adaptive error control for finite element based simulations

Waanders

Carnes

2010

Comput Mech

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Optimization problems constrained by complex dynamics can lead to computationally challenging problems especially when high accuracy and efficiency are required. We present an approach to adaptively control numerical errors in optimization problems approximated using the finite element method. The discrete adjoint equation serves as a key tool to efficiently compute both parameter sensitivities and goal-oriented error estimates at the same discretized levels. By using a recovery method for the error estimators, we avoid expensive higher order adjoint calculations. We nest the adaptivity of the mesh within the optimization algorithm, which is responsible for converging both the state and optimization algorithms and thereby allowing the reuse of state, parameters, and reduced Hessian in subsequent optimization iterations. Our approach is demonstrated on a parameter estimation problem for contamination transport in a contact tank reactor. Significant efficiency and accuracy improvements are realized in comparison to uniform grid refinement strategies and black-box optimization methods. A flexible and maintainable software interface was developed to provide access between the underlying linear algebra of a production simulator and advanced numerical algorithms such as optimization and error estimation.

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Simulating disinfection processes in chlorine contact tanks using various turbulence models and high-order accurate difference schemes

Cited by 55 publications

References 119 publications

Spiral-shaped reactor for water disinfection

Spiral-shaped reactor for water disinfection

Evaluation of the effect of baffle shape in flocculation basin on hydrodynamic behavior using computational fluid dynamics

Optimization under adaptive error control for finite element based simulations

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