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An in-depth analysis of the hydrodynamic behaviour of a high-rate lamellar DAF tank by means of CFD simulations

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Title: An in-depth analysis of the hydrodynamic behaviour of a high-rate lamellar DAF tank by means of CFD simulations
Authors: Dmytro Hlukhov, Gorka S. Larraona, Alejandro Rivas, Juan Carlos Ramos
Source: Applied Water Science, Vol 14, Iss 6, Pp 1-17 (2024)
Publisher Information: SpringerOpen, 2024.
Publication Year: 2024
Collection: LCC:Water supply for domestic and industrial purposes
Subject Terms: Dissolved Air Flotation, Lamellae, Lamellar DAF, High-rate DAF, Computational Fluid Dynamics, Removal efficiency, Water supply for domestic and industrial purposes, TD201-500
More Details: Abstract This research is based on computational fluid dynamics simulations of water and microbubble flow within the tank of a lamellar DAF (L-DAF) clarification system operating under high-rate DAF conditions (12–30 m/h). Firstly, performance of the DAF tank with lamellae was evaluated under two operating conditions in which the flow was either short-circuited or stratified in the absence of lamellae. In addition, the improvement in bubble removal efficiency achieved by the incorporation of lamellae in each scenario was assessed. Secondly, an in-depth analysis was conducted of the flow that develops in the separation zone as a result of placing the lamella pack in that part of the tank. The significant density difference that the lamellae cause to exist between the bubble blanket and clarified water below is responsible for the complex three-dimensional flow observed between the two regions. Analysis of this flow showed a previously undescribed mechanism in which the density gradient plays a crucial role in preventing bubbles from passing through the lamellae and ultimately escaping with the effluent. Finally, the effect of hydraulic loading on the bubble removal efficiency of the L-DAF tank under consideration was researched, and it was found that an L-DAF with a height/length ratio of 0.72 is able to operate at hydraulic loading close to 30 m/h, evidencing good debubbling performance.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2190-5487
2190-5495
Relation: https://doaj.org/toc/2190-5487; https://doaj.org/toc/2190-5495
DOI: 10.1007/s13201-024-02197-0
Access URL: https://doaj.org/article/57b08d76079a49f599ff80a1fa33b3e4
Accession Number: edsdoj.57b08d76079a49f599ff80a1fa33b3e4
Database: Directory of Open Access Journals
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  Data: An in-depth analysis of the hydrodynamic behaviour of a high-rate lamellar DAF tank by means of CFD simulations
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  Data: <searchLink fieldCode="AR" term="%22Dmytro+Hlukhov%22">Dmytro Hlukhov</searchLink><br /><searchLink fieldCode="AR" term="%22Gorka+S%2E+Larraona%22">Gorka S. Larraona</searchLink><br /><searchLink fieldCode="AR" term="%22Alejandro+Rivas%22">Alejandro Rivas</searchLink><br /><searchLink fieldCode="AR" term="%22Juan+Carlos+Ramos%22">Juan Carlos Ramos</searchLink>
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  Data: Applied Water Science, Vol 14, Iss 6, Pp 1-17 (2024)
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  Data: SpringerOpen, 2024.
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  Data: 2024
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  Data: LCC:Water supply for domestic and industrial purposes
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  Data: <searchLink fieldCode="DE" term="%22Dissolved+Air+Flotation%22">Dissolved Air Flotation</searchLink><br /><searchLink fieldCode="DE" term="%22Lamellae%22">Lamellae</searchLink><br /><searchLink fieldCode="DE" term="%22Lamellar+DAF%22">Lamellar DAF</searchLink><br /><searchLink fieldCode="DE" term="%22High-rate+DAF%22">High-rate DAF</searchLink><br /><searchLink fieldCode="DE" term="%22Computational+Fluid+Dynamics%22">Computational Fluid Dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Removal+efficiency%22">Removal efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Water+supply+for+domestic+and+industrial+purposes%22">Water supply for domestic and industrial purposes</searchLink><br /><searchLink fieldCode="DE" term="%22TD201-500%22">TD201-500</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: Abstract This research is based on computational fluid dynamics simulations of water and microbubble flow within the tank of a lamellar DAF (L-DAF) clarification system operating under high-rate DAF conditions (12–30 m/h). Firstly, performance of the DAF tank with lamellae was evaluated under two operating conditions in which the flow was either short-circuited or stratified in the absence of lamellae. In addition, the improvement in bubble removal efficiency achieved by the incorporation of lamellae in each scenario was assessed. Secondly, an in-depth analysis was conducted of the flow that develops in the separation zone as a result of placing the lamella pack in that part of the tank. The significant density difference that the lamellae cause to exist between the bubble blanket and clarified water below is responsible for the complex three-dimensional flow observed between the two regions. Analysis of this flow showed a previously undescribed mechanism in which the density gradient plays a crucial role in preventing bubbles from passing through the lamellae and ultimately escaping with the effluent. Finally, the effect of hydraulic loading on the bubble removal efficiency of the L-DAF tank under consideration was researched, and it was found that an L-DAF with a height/length ratio of 0.72 is able to operate at hydraulic loading close to 30 m/h, evidencing good debubbling performance.
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        Value: 10.1007/s13201-024-02197-0
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      – Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 17
        StartPage: 1
    Subjects:
      – SubjectFull: Dissolved Air Flotation
        Type: general
      – SubjectFull: Lamellae
        Type: general
      – SubjectFull: Lamellar DAF
        Type: general
      – SubjectFull: High-rate DAF
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      – SubjectFull: Computational Fluid Dynamics
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      – SubjectFull: Removal efficiency
        Type: general
      – SubjectFull: Water supply for domestic and industrial purposes
        Type: general
      – SubjectFull: TD201-500
        Type: general
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      – TitleFull: An in-depth analysis of the hydrodynamic behaviour of a high-rate lamellar DAF tank by means of CFD simulations
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            NameFull: Dmytro Hlukhov
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            NameFull: Gorka S. Larraona
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            NameFull: Alejandro Rivas
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            NameFull: Juan Carlos Ramos
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              M: 05
              Type: published
              Y: 2024
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