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

Goula, Athanasia M.; Kostoglou, Margaritis; Karapantsios, Thodoris D.; Zouboulis, Anastasios

doi:10.1016/j.cej.2007.09.022

Cited by 124 publications

(71 citation statements)

References 24 publications

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“…PDM is a reasonable method and also has the potential to solve problems, such as noise, energy waste, and high maintenance cost, related with the use of a mechanical mixer. The work conducted by Clark et al (1994), using various rapid mixing devices (Cheremisinoff (2002)) to test the sedimentation performance (Goula et al (2008)), showed that in-line hydraulic jet and static mixers (Smith et al (1991)) are able to achieve performance equivalent to that of the mechanical mixing type at a lower coagulant dosage (Park et al (2009), Yoon and Kim (2008).…”

Section: Introductionmentioning

confidence: 99%

“…Rapid mixing (Cheremisinoff (2002), Asano et al (2007), Mavros (2001)), in water treatment is to rapidly disperse the coagulant into raw water, followed by flocculation (Ghernaout and Naceur (2011)), sedimentation (Goula et al (2008)), and filtration (Kurita (1999), De Zuane (1997), Xiao et al (2008)). This process has a strong influence on the overall treatment efficiency (O'connor et al important to make the metallic coagulants rapidly disperse into the whole fluid bulk.…”

Section: Introductionmentioning

confidence: 99%

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Review of Coagulation’s Rapid Mixing for NOM Removal

Ghernaout¹,

Boucherit²

2015

CHEM

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This review focuses on rapid mixing in the coagulation process for improved natural organic matter (NOM) removal in water treatment. Rapid mixing aims to instantly and efficiently disperse coagulant species into raw water, before flocculation, sedimentation, and filtration processes. Mechanical mixing with a longer retention time cannot guarantee an instantaneous and uniform coagulant dispersion. For this reason, the so-called pump diffusion mixer (PDM) has been proposed. Using various rapid mixing devices to test the sedimentation performance, it is showed that in-line hydraulic jet and static mixers are able to achieve performance equivalent to that of the mechanical mixing type at a lower coagulant dosage. On the other hand, the removal of NOM as disinfection by-products (DBPs) precursor by chemical coagulation (CC) has been extensively studied. It is well reported that enhanced coagulation (EC) by adjusting the pH downwards to 4-5 prior to coagulant addition will encourage the formation of soluble NOM-Al complex from low-turbidity waters. In case of most waters, therefore, acid must be added to maintain the desired coagulation pH for EC, and excess coagulant is required to improve the removal of NOM. However, CC using in-line hydraulic jet mixer such as PDM is a reasonable method for the improvement of coagulation process compared to EC, since it is possible to obtain good removals of NOM as well as turbidity using a lower dosages of coagulant without supplementary addition of chemicals for pH control and thus producing a smaller volume of waste solids.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Review of Coagulation’s Rapid Mixing for NOM Removal

Ghernaout¹,

Boucherit²

2015

CHEM

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“…A very important change in the possibilities to analyze the operation of sedimentation tanks and the process of sedimentation itself has been achieved thanks to numerical methods, the use of which allows one not only to obtain information on the sedimentation rate in the device, but also to model multiphase systems (Goula et al, 2008;Bargiel & Tory, 2004;Kolodziejczyk, 2013). Furthermore, the use of numerical methods to calculate sedimentation allows, besides calculating slurry concentrations in the sedimentation device, to know its changes over time.…”

Section: Introductionmentioning

confidence: 99%

“…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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“…Shahrokhi et al, 2011, investigated the effect of a baffle with different angles on the hydrodynamics of the flow field in a primary sedimentation tank by the application of a computational model. Goula et al, 2008, studied the influence of a feed flow control baffle for the improvement of solids settling in a full-scale circular settling tank used for potable water. CFD modeling is used by Esping et al, 2012, to evaluate primary settling tank performance and a novel wet weather chemically enhanced high rate treatment tank configuration.…”

Section: Introductionmentioning

confidence: 99%