View in EDS HTML Full Text PDF Full Text

Enhancing Hydrogenotrophic Methanation in a Bentonite-Amended Bubble Reactor Under Mesophilic Conditions.

Saved in:
Bibliographic Details
Title: Enhancing Hydrogenotrophic Methanation in a Bentonite-Amended Bubble Reactor Under Mesophilic Conditions.
Authors: Spyridonidis, Apostolos1 (AUTHOR), Stamatelatou, Katerina1 (AUTHOR) astamat@env.duth.gr
Source: Energies (19961073). Apr2026, Vol. 19 Issue 7, p1613. 21p.
Subject Terms: *Bentonite, *Bubble column reactors, *Temperature, *Gas-liquid interfaces, *Bacteria, *Biofilms, *Biogas production, *Methane
Abstract: This study explores the use of bentonite to enhance biological biogas upgrading in a bubble reactor (BR) operated under mesophilic conditions (39 ± 1 °C). The experimental setup consisted of a 2 L vertically oriented BR (height-to-diameter ratio 16:1) fed with a synthetic gas mixture (60% H2, 15% CO2, 25% CH4, v/v) at a gas recirculation rate of 4 L LR−1 h−1. The aim was to overcome hydrogen's low gas–liquid mass transfer rate while avoiding the operational challenges typically associated with trickle-bed reactors (TBR). Bentonite increases the density and hydrostatic pressure of the liquid medium and likely alters its rheology, thereby extending the gas–liquid contact time without requiring elevated pressures or intensive gas recirculation. Additionally, bentonite is expected to provide microstructural support that promotes the formation of biofilm-like communities, creating favorable microenvironments for hydrogenotrophic methanogens. As a clay-based additive, bentonite may also contribute to improved process stability through adsorption of inhibitory compounds, enhanced biomass retention, and pH buffering. Under mesophilic conditions, the bentonite-modified BR achieved a methane production rate of 2.17 ± 0.06 LCH4 LR−1 d−1 at a gas retention time of 1.49 h, with methane purity reaching 96.25%. In comparison, a previously reported mesophilic BR operated under an identical reactor configuration and operating conditions but without bentonite exhibited substantially lower methane production rates, supporting the beneficial role of bentonite in biological methanation. The findings highlight bentonite's potential dual role (physical and biological) in improving process efficiency and stability in biological methanation. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
Full text is not displayed to guests.
FullText Links:
  – Type: pdflink
Text:
  Availability: 1
Header DbId: enr
DbLabel: Energy & Power Source
An: 192959017
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Enhancing Hydrogenotrophic Methanation in a Bentonite-Amended Bubble Reactor Under Mesophilic Conditions.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Spyridonidis%2C+Apostolos%22">Spyridonidis, Apostolos</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Stamatelatou%2C+Katerina%22">Stamatelatou, Katerina</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> astamat@env.duth.gr</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Apr2026, Vol. 19 Issue 7, p1613. 21p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Bentonite%22">Bentonite</searchLink><br />*<searchLink fieldCode="DE" term="%22Bubble+column+reactors%22">Bubble column reactors</searchLink><br />*<searchLink fieldCode="DE" term="%22Temperature%22">Temperature</searchLink><br />*<searchLink fieldCode="DE" term="%22Gas-liquid+interfaces%22">Gas-liquid interfaces</searchLink><br />*<searchLink fieldCode="DE" term="%22Bacteria%22">Bacteria</searchLink><br />*<searchLink fieldCode="DE" term="%22Biofilms%22">Biofilms</searchLink><br />*<searchLink fieldCode="DE" term="%22Biogas+production%22">Biogas production</searchLink><br />*<searchLink fieldCode="DE" term="%22Methane%22">Methane</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study explores the use of bentonite to enhance biological biogas upgrading in a bubble reactor (BR) operated under mesophilic conditions (39 ± 1 °C). The experimental setup consisted of a 2 L vertically oriented BR (height-to-diameter ratio 16:1) fed with a synthetic gas mixture (60% H2, 15% CO2, 25% CH4, v/v) at a gas recirculation rate of 4 L LR−1 h−1. The aim was to overcome hydrogen's low gas–liquid mass transfer rate while avoiding the operational challenges typically associated with trickle-bed reactors (TBR). Bentonite increases the density and hydrostatic pressure of the liquid medium and likely alters its rheology, thereby extending the gas–liquid contact time without requiring elevated pressures or intensive gas recirculation. Additionally, bentonite is expected to provide microstructural support that promotes the formation of biofilm-like communities, creating favorable microenvironments for hydrogenotrophic methanogens. As a clay-based additive, bentonite may also contribute to improved process stability through adsorption of inhibitory compounds, enhanced biomass retention, and pH buffering. Under mesophilic conditions, the bentonite-modified BR achieved a methane production rate of 2.17 ± 0.06 LCH4 LR−1 d−1 at a gas retention time of 1.49 h, with methane purity reaching 96.25%. In comparison, a previously reported mesophilic BR operated under an identical reactor configuration and operating conditions but without bentonite exhibited substantially lower methane production rates, supporting the beneficial role of bentonite in biological methanation. The findings highlight bentonite's potential dual role (physical and biological) in improving process efficiency and stability in biological methanation. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=192959017
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.3390/en19071613
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 21
        StartPage: 1613
    Subjects:
      – SubjectFull: Bentonite
        Type: general
      – SubjectFull: Bubble column reactors
        Type: general
      – SubjectFull: Temperature
        Type: general
      – SubjectFull: Gas-liquid interfaces
        Type: general
      – SubjectFull: Bacteria
        Type: general
      – SubjectFull: Biofilms
        Type: general
      – SubjectFull: Biogas production
        Type: general
      – SubjectFull: Methane
        Type: general
    Titles:
      – TitleFull: Enhancing Hydrogenotrophic Methanation in a Bentonite-Amended Bubble Reactor Under Mesophilic Conditions.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Spyridonidis, Apostolos
      – PersonEntity:
          Name:
            NameFull: Stamatelatou, Katerina
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 04
              Text: Apr2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 19961073
          Numbering:
            – Type: volume
              Value: 19
            – Type: issue
              Value: 7
          Titles:
            – TitleFull: Energies (19961073)
              Type: main
ResultId 1