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Chain elongation in continuous microbial electrosynthesis cells: The effect of pH and precursors supply

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Title: Chain elongation in continuous microbial electrosynthesis cells: The effect of pH and precursors supply
Authors: Quintela, Cesar, Bountzis, Pantelis, Rezaei, Babak, Im, Chaeho, 1989, Modin, Oskar, 1980, Nygård, Yvonne, 1986, Olsson, Lisbeth, 1963, Skiadas, Ioannis V., Gavala, Hariklia N.
Source: Journal of CO2 Utilization. 83
Subject Terms: pH, Chain elongation, Caproic acid, Butyric acid, Microbial electrosynthesis
Description: Microbial electrosynthesis (MES) enables the production of carbon-neutral chemicals using CO2 as a carbon source. Acetic acid is the main MES product, but recent studies show the direct production of elongated carboxylic acids, e.g., butyric and caproic acid. However, the production of elongated acids in MES systems is still inefficient due to the low growth rates of acetogenic bacteria and to limited solventogenic rates. Subsequently, researchers have produced elongated carboxylic acids directly from acetic acid or have operated MES systems at low pH to favor solventogenesis. However, the effect the addition of different chain elongation precursors and the operation pH exerts in the bioelectrochemical production of elongated acids remains unclear. To investigate this, three pH-controlled MES systems were operated in this study with continuous liquid and gas supply. MES systems elongating acetic acid at pH 6 achieved higher butyric (0.71 vs. 0.42 g L−1) and caproic acid (0.71 vs. 0.42 g L−1) titers in the absence of CO2 sparging. Additionally, lowering the pH to 5 in the MES systems fed with CO2 and acetic acid improved the elongated acids titers, reaching 0.72 g L−1 butyric and 0.33 g L−1 caproic acid. The 16 S rRNA analysis showed the community was dominated by Oscillibacter at pH 6, and by Clostridium at pH 5. Furthermore, the first scanning electron microscopy pictures revealing biofilm stratification in MES cathodes were taken in this study, where homogeneous rod-shaped bacteria biofilm layers, in contact with the graphite cathode, were covered by heterogeneous biofilm layers.
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  Data: Chain elongation in continuous microbial electrosynthesis cells: The effect of pH and precursors supply
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  Data: <searchLink fieldCode="AR" term="%22Quintela%2C+Cesar%22">Quintela, Cesar</searchLink><br /><searchLink fieldCode="AR" term="%22Bountzis%2C+Pantelis%22">Bountzis, Pantelis</searchLink><br /><searchLink fieldCode="AR" term="%22Rezaei%2C+Babak%22">Rezaei, Babak</searchLink><br /><searchLink fieldCode="AR" term="%22Im%2C+Chaeho%22">Im, Chaeho</searchLink>, 1989<br /><searchLink fieldCode="AR" term="%22Modin%2C+Oskar%22">Modin, Oskar</searchLink>, 1980<br /><searchLink fieldCode="AR" term="%22Nygård%2C+Yvonne%22">Nygård, Yvonne</searchLink>, 1986<br /><searchLink fieldCode="AR" term="%22Olsson%2C+Lisbeth%22">Olsson, Lisbeth</searchLink>, 1963<br /><searchLink fieldCode="AR" term="%22Skiadas%2C+Ioannis+V%2E%22">Skiadas, Ioannis V.</searchLink><br /><searchLink fieldCode="AR" term="%22Gavala%2C+Hariklia+N%2E%22">Gavala, Hariklia N.</searchLink>
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  Data: <i>Journal of CO2 Utilization</i>. 83
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  Data: <searchLink fieldCode="DE" term="%22pH%22">pH</searchLink><br /><searchLink fieldCode="DE" term="%22Chain+elongation%22">Chain elongation</searchLink><br /><searchLink fieldCode="DE" term="%22Caproic+acid%22">Caproic acid</searchLink><br /><searchLink fieldCode="DE" term="%22Butyric+acid%22">Butyric acid</searchLink><br /><searchLink fieldCode="DE" term="%22Microbial+electrosynthesis%22">Microbial electrosynthesis</searchLink>
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  Label: Description
  Group: Ab
  Data: Microbial electrosynthesis (MES) enables the production of carbon-neutral chemicals using CO2 as a carbon source. Acetic acid is the main MES product, but recent studies show the direct production of elongated carboxylic acids, e.g., butyric and caproic acid. However, the production of elongated acids in MES systems is still inefficient due to the low growth rates of acetogenic bacteria and to limited solventogenic rates. Subsequently, researchers have produced elongated carboxylic acids directly from acetic acid or have operated MES systems at low pH to favor solventogenesis. However, the effect the addition of different chain elongation precursors and the operation pH exerts in the bioelectrochemical production of elongated acids remains unclear. To investigate this, three pH-controlled MES systems were operated in this study with continuous liquid and gas supply. MES systems elongating acetic acid at pH 6 achieved higher butyric (0.71 vs. 0.42 g L−1) and caproic acid (0.71 vs. 0.42 g L−1) titers in the absence of CO2 sparging. Additionally, lowering the pH to 5 in the MES systems fed with CO2 and acetic acid improved the elongated acids titers, reaching 0.72 g L−1 butyric and 0.33 g L−1 caproic acid. The 16 S rRNA analysis showed the community was dominated by Oscillibacter at pH 6, and by Clostridium at pH 5. Furthermore, the first scanning electron microscopy pictures revealing biofilm stratification in MES cathodes were taken in this study, where homogeneous rod-shaped bacteria biofilm layers, in contact with the graphite cathode, were covered by heterogeneous biofilm layers.
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        Value: 10.1016/j.jcou.2024.102789
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      – Text: English
    Subjects:
      – SubjectFull: pH
        Type: general
      – SubjectFull: Chain elongation
        Type: general
      – SubjectFull: Caproic acid
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      – SubjectFull: Butyric acid
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      – SubjectFull: Microbial electrosynthesis
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      – TitleFull: Chain elongation in continuous microbial electrosynthesis cells: The effect of pH and precursors supply
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              Type: published
              Y: 2024
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              Value: 83
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