A CFD-based simulation study of a large scale flocculation tank for potable water treatment

Samaras, Konstantinos; Zouboulis, Anastasios; Karapantsios, Thodoris D.; Kostoglou, Margaritis

doi:10.1016/j.cej.2010.05.032

Cited by 40 publications

(19 citation statements)

References 25 publications

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“…Thus the flocs are subjected to an uneven proportion of high and low G values, which can potentially cause damage to the flocs that have only been partially developed. The next step will be to account for the interaction of the local physicochemical flocculation processes in the complex flow field developed through a passive scalar description of the particle phase (Samaras et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

“…Using computational fluid dynamics (CFD)—a numerical modeling approach—Haarhoff and Van der Walt (2001) quantified high‐turbulence zones in terms of estimated local G value as approximately 5% of the total flocculator volume for an around‐the‐end hydraulic flocculator. Review of previous studies, however, reveals that the application of CFD is more confined to hydrodynamics related to bench‐scale mixers (impellers), with fewer examples (Bridgeman et al, 2010; Samaras et al, 2010; Essemiani et al, 2002; Haarhoff & Van der Walt, 2001) available with regard to the pilot‐ and full‐scale flocculation process. As a result of wide variation in flocculator designs used in water treatment plants (WTPs), a detailed understanding of the fluid mechanics in these flocculators is critical for enhancing floc growth and stability at optimal retention time.…”

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confidence: 99%

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Assessment of hydraulic flocculation processes using CFD

Vadasarukkai¹,

Gagnon²,

Campbell³

et al. 2011

Journal AWWA

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The performance of flocculation tanks either in full‐ or pilot‐scale systems cannot be fully quantified using average velocity gradient values (G values) alone. The computational fluid dynamics (CFD) process was used to investigate the turbulent flow characteristics of a three‐stage hydraulic flocculation facility at the J.D. Kline Water Supply Plant in Halifax, Nova Scotia. Calculations of the local velocity gradient were achieved using predicted energy dissipation rates. CFD analysis showed unbalanced mixing conditions in the hydraulic flocculation tanks resulting from short‐circuiting and from recirculation zones. Inconsistent mixing energy, interrupted with severe spikes in the localized G values at the weir columns, led to little or no mixing energy in most of the regions in the flocculation tanks. Practical outcomes of operating at such varying mixing gradients can be detrimental to the flocculation process and overall organic removal in the treatment plant.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Assessment of hydraulic flocculation processes using CFD

Vadasarukkai¹,

Gagnon²,

Campbell³

et al. 2011

Journal AWWA

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“…An approach of combining CFD with physicochemical models for the simulation of large scale processes concerning the removal of solid particles from slightly polluted waters has been developed. A new methodology has been proposed to simulate the performance of flotation [40] and flocculation tanks [41] of a drinking water refinery. In both cases the developed models were validated against experimental data and an extensive parametric analysis was performed, (Figure 2).…”

Section: Combining Cfd With Physicochemical Models Bubble Formation mentioning

confidence: 99%

Smart and green interfaces: From single bubbles/drops to industrial environmental and biomedical applications

Dutschk

Karapantsios

Liggieri

et al. 2014

Advances in Colloid and Interface Science

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Interfaces can be called Smart and Green (S&G) when tailored such that the required technologies can be implemented with high efficiency, adaptability and selectivity. At the same time they have also to be eco-friendly, i.e. products must be biodegradable, reusable or simply more durable. Bubble and drop interfaces are in many of these smart technologies the fundamental entities and help develop smart products of the everyday life.Significant improvements of these processes and products can be achieved by implementing and manipulating specific properties of these interfaces in a simple and smart way, in order to accomplish specific tasks. The severe environmental issues require in addition attributing ecofriendly features to these interfaces, by incorporating innovative , or, sometime, recycle materials and conceiving new production processes which minimize the use of natural resources and energy. Such concept can be extended to include important societal challenges related to support a sustainable development and a healthy population.The achievement of such ambitious targets requires the technology research to be supported by a robust development of theoretical and experimental tools, needed to understand in more details the behavior of complex interfaces. A wide but not exhaustive review of recent work concerned with green and smart interfaces is presented, addressing different scientific and technological fields. The presented approaches reveal a huge potential in relation to various technological fields, such as nanotechnologies, biotechnologies, medical diagnostics, new or improved materials.

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“…Process release a portion of the solid from the suspension normally is carried out in settling tanks (Kowalski, 2004;Burger & Wendland, 2001;Bandrowski et al, 2001;Banaś, 2004a), that is devices using sedimentation process. The intensification of the process of sedimentation, the optimization of the process as well as the construction settlers still an important research topic (Bajcar et al, 2010(Bajcar et al, , 2011Branny & Swolkien, 2010;Rostami et al, 2011;Goula, 2008;Samaras, 2010;Xanthos, 2011;Malcher & Gzyl-Malcher, 2012;Surowiak & Brozek, 2014;Tryggavason & Zaleski, 2011).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Coal Suspension Sedimentation

Kołodziejczyk

2016

Archives of Mining Sciences

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The article describes the feasibility of numerical simulation of sedimentation process of coal suspension, with high concentration, using the Ansys Fluent package, with the assumption monodisperse grain composition of the disperse phase of the suspension. The analysis contains selection of computational model, determine the parameters for analysis and comparison of the results with laboratory tests. To comparison laboratory measurement and numerical simulation sedimentation test was used. In the analysis was used suspension from the coal purification process.Keywords: coal suspension, sedimentation, numerical simulation of sedimentation, sedimentation test W artykule zamieszczono analizę możliwości prowadzenia symulacji numerycznych procesu sedymentacji zawiesiny węglowej o wysokim stężeniu, z wykorzystaniem pakietu Ansys Fluent przy założeniu monodyspersyjnego składu ziarnowego fazy dyspersyjnej zawiesiny.Analiza zawiera dobór modelu obliczeniowego, określenie parametrów analizy oraz porównanie uzyskanych wyników z badaniami laboratoryjnymi. Do porównania pomiaru laboratoryjnego oraz symulacja numeryczna wykorzystano test sedymentacyjny. W analizie wykorzystano zawiesinę z procesu oczyszczania węgla.

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A CFD-based simulation study of a large scale flocculation tank for potable water treatment

Cited by 40 publications

References 25 publications

Assessment of hydraulic flocculation processes using CFD

Assessment of hydraulic flocculation processes using CFD

Smart and green interfaces: From single bubbles/drops to industrial environmental and biomedical applications

Numerical Simulation of Coal Suspension Sedimentation

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