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Numerical Simulation and Flotation Unit Structural Optimization of Dissolved Air Flotation–Sedimentation Tank for Oilfield Alkali/Surfactant/Polymer (ASP)-Flooding Produced Water.

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Title: Numerical Simulation and Flotation Unit Structural Optimization of Dissolved Air Flotation–Sedimentation Tank for Oilfield Alkali/Surfactant/Polymer (ASP)-Flooding Produced Water.
Authors: Wang, Bingbei1,2 (AUTHOR), Guo, Jiajun2 (AUTHOR), Zhang, Hongda1,3 (AUTHOR), Zhu, Jiawei1,3 (AUTHOR), Wang, Wenhui1,2 (AUTHOR), Bu, Fanxi1,3 (AUTHOR) bufanxi_nepu@163.com
Source: Energies (19961073). Apr2026, Vol. 19 Issue 8, p1955. 21p.
Subject Terms: *Dissolved air flotation (Water purification), *Structural optimization, *Flotation, *Oil field brines, *Separation (Technology), *Computer simulation, *Settling basins
Abstract: The low separation efficiency of alkali/surfactant/polymer (ASP)-flooding-produced water, attributed to its high emulsification, high viscosity, and surfactant enrichment, presents a significant treatment challenge. To evaluate the effects of flotation unit structure on internal flow field characteristics and the separation performance of oil and suspended solids in a dissolved air flotation–sedimentation tank, this study conducted CFD numerical simulations. The results demonstrate that with 40 gas injection ports, the flow field achieves optimal uniformity and stability: the oil removal rate reaches 68.1%, and the suspended solids removal rate reaches 56.6%. Compared to the single-ring and triple-ring configurations, the double-ring gas injection form exhibits better flow continuity, resulting in increased removal rates of 67.6% for oil and 56.7% for suspended solids. At a gas injection ring height of 10,500 mm, the oil layer in the flotation zone remains continuous and stable, while suspended solids settle into a distinct sediment layer at the bottom, enhancing both oil and suspended solids removal efficiencies. On this basis, the optimized structure of the flotation unit was determined. The removal rates of oil and suspended solids were enhanced by approximately 1.8% to 4.8% and 3.5% to 7.0%, respectively, compared to the existing conditions. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 193438295
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Numerical Simulation and Flotation Unit Structural Optimization of Dissolved Air Flotation–Sedimentation Tank for Oilfield Alkali/Surfactant/Polymer (ASP)-Flooding Produced Water.
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Bingbei%22">Wang, Bingbei</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Guo%2C+Jiajun%22">Guo, Jiajun</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Hongda%22">Zhang, Hongda</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhu%2C+Jiawei%22">Zhu, Jiawei</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Wenhui%22">Wang, Wenhui</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bu%2C+Fanxi%22">Bu, Fanxi</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> bufanxi_nepu@163.com</i>
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  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Apr2026, Vol. 19 Issue 8, p1955. 21p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Dissolved+air+flotation+%28Water+purification%29%22">Dissolved air flotation (Water purification)</searchLink><br />*<searchLink fieldCode="DE" term="%22Structural+optimization%22">Structural optimization</searchLink><br />*<searchLink fieldCode="DE" term="%22Flotation%22">Flotation</searchLink><br />*<searchLink fieldCode="DE" term="%22Oil+field+brines%22">Oil field brines</searchLink><br />*<searchLink fieldCode="DE" term="%22Separation+%28Technology%29%22">Separation (Technology)</searchLink><br />*<searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br />*<searchLink fieldCode="DE" term="%22Settling+basins%22">Settling basins</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The low separation efficiency of alkali/surfactant/polymer (ASP)-flooding-produced water, attributed to its high emulsification, high viscosity, and surfactant enrichment, presents a significant treatment challenge. To evaluate the effects of flotation unit structure on internal flow field characteristics and the separation performance of oil and suspended solids in a dissolved air flotation–sedimentation tank, this study conducted CFD numerical simulations. The results demonstrate that with 40 gas injection ports, the flow field achieves optimal uniformity and stability: the oil removal rate reaches 68.1%, and the suspended solids removal rate reaches 56.6%. Compared to the single-ring and triple-ring configurations, the double-ring gas injection form exhibits better flow continuity, resulting in increased removal rates of 67.6% for oil and 56.7% for suspended solids. At a gas injection ring height of 10,500 mm, the oil layer in the flotation zone remains continuous and stable, while suspended solids settle into a distinct sediment layer at the bottom, enhancing both oil and suspended solids removal efficiencies. On this basis, the optimized structure of the flotation unit was determined. The removal rates of oil and suspended solids were enhanced by approximately 1.8% to 4.8% and 3.5% to 7.0%, respectively, compared to the existing conditions. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.3390/en19081955
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 21
        StartPage: 1955
    Subjects:
      – SubjectFull: Dissolved air flotation (Water purification)
        Type: general
      – SubjectFull: Structural optimization
        Type: general
      – SubjectFull: Flotation
        Type: general
      – SubjectFull: Oil field brines
        Type: general
      – SubjectFull: Separation (Technology)
        Type: general
      – SubjectFull: Computer simulation
        Type: general
      – SubjectFull: Settling basins
        Type: general
    Titles:
      – TitleFull: Numerical Simulation and Flotation Unit Structural Optimization of Dissolved Air Flotation–Sedimentation Tank for Oilfield Alkali/Surfactant/Polymer (ASP)-Flooding Produced Water.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Wang, Bingbei
      – PersonEntity:
          Name:
            NameFull: Guo, Jiajun
      – PersonEntity:
          Name:
            NameFull: Zhang, Hongda
      – PersonEntity:
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            NameFull: Zhu, Jiawei
      – PersonEntity:
          Name:
            NameFull: Wang, Wenhui
      – PersonEntity:
          Name:
            NameFull: Bu, Fanxi
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          Dates:
            – D: 15
              M: 04
              Text: Apr2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 19961073
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            – Type: volume
              Value: 19
            – Type: issue
              Value: 8
          Titles:
            – TitleFull: Energies (19961073)
              Type: main
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