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Aeration promotes Proteobacteria over Firmicutes in macerated food waste, resulting in superior anaerobic digestion efficiency.

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Title: Aeration promotes Proteobacteria over Firmicutes in macerated food waste, resulting in superior anaerobic digestion efficiency.
Authors: Tang, Linjie1 (AUTHOR), Manefield, Mike1 (AUTHOR)
Source: FEMS Microbiology Letters. 2025, Vol. 372, p1-8. 8p.
Subjects: Proteobacteria, Food waste, Gram-positive bacteria, Biogas production, Anaerobic metabolism, Microbial communities, Extracellular enzymes
Abstract: Aeration is a common pretreatment method to enhance biogas production via anaerobic digestion of waste organic feedstocks such as unused food. While impacts on downstream anaerobic digestion have been intensively investigated, the consequence of aeration on the microbial community in food waste has not been characterized. Food waste has a low pH resulting from the dominance of lactic acid bacteria within the Firmicutes phylum. This excludes other phylotypes with a higher potential to hydrolyse complex biopolymers in food waste. In this study, we reveal that aeration of macerated food waste results in a dramatic shift away from Firmicutes towards dominance of Proteobacteria that are better known for extracellular enzyme production. Given that hydrolysis is the rate limiting step in anaerobic digestion, this explains why aeration improves the efficiency of biogas production from food waste. The discovery that Proteobacteria dominate microbial communities in aerated food waste opens up opportunities to manipulate extracellular enzyme production through gene expression mechanisms common among Proteobacteria such as quorum sensing. [ABSTRACT FROM AUTHOR]
Copyright of FEMS Microbiology Letters is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
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  Data: Aeration promotes Proteobacteria over Firmicutes in macerated food waste, resulting in superior anaerobic digestion efficiency.
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  Data: <searchLink fieldCode="AR" term="%22Tang%2C+Linjie%22">Tang, Linjie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Manefield%2C+Mike%22">Manefield, Mike</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22FEMS+Microbiology+Letters%22">FEMS Microbiology Letters</searchLink>. 2025, Vol. 372, p1-8. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Proteobacteria%22">Proteobacteria</searchLink><br /><searchLink fieldCode="DE" term="%22Food+waste%22">Food waste</searchLink><br /><searchLink fieldCode="DE" term="%22Gram-positive+bacteria%22">Gram-positive bacteria</searchLink><br /><searchLink fieldCode="DE" term="%22Biogas+production%22">Biogas production</searchLink><br /><searchLink fieldCode="DE" term="%22Anaerobic+metabolism%22">Anaerobic metabolism</searchLink><br /><searchLink fieldCode="DE" term="%22Microbial+communities%22">Microbial communities</searchLink><br /><searchLink fieldCode="DE" term="%22Extracellular+enzymes%22">Extracellular enzymes</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Aeration is a common pretreatment method to enhance biogas production via anaerobic digestion of waste organic feedstocks such as unused food. While impacts on downstream anaerobic digestion have been intensively investigated, the consequence of aeration on the microbial community in food waste has not been characterized. Food waste has a low pH resulting from the dominance of lactic acid bacteria within the Firmicutes phylum. This excludes other phylotypes with a higher potential to hydrolyse complex biopolymers in food waste. In this study, we reveal that aeration of macerated food waste results in a dramatic shift away from Firmicutes towards dominance of Proteobacteria that are better known for extracellular enzyme production. Given that hydrolysis is the rate limiting step in anaerobic digestion, this explains why aeration improves the efficiency of biogas production from food waste. The discovery that Proteobacteria dominate microbial communities in aerated food waste opens up opportunities to manipulate extracellular enzyme production through gene expression mechanisms common among Proteobacteria such as quorum sensing. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of FEMS Microbiology Letters is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1093/femsle/fnaf001
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 8
        StartPage: 1
    Subjects:
      – SubjectFull: Proteobacteria
        Type: general
      – SubjectFull: Food waste
        Type: general
      – SubjectFull: Gram-positive bacteria
        Type: general
      – SubjectFull: Biogas production
        Type: general
      – SubjectFull: Anaerobic metabolism
        Type: general
      – SubjectFull: Microbial communities
        Type: general
      – SubjectFull: Extracellular enzymes
        Type: general
    Titles:
      – TitleFull: Aeration promotes Proteobacteria over Firmicutes in macerated food waste, resulting in superior anaerobic digestion efficiency.
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            NameFull: Tang, Linjie
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            NameFull: Manefield, Mike
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            – D: 01
              M: 01
              Text: 2025
              Type: published
              Y: 2025
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              Value: 372
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            – TitleFull: FEMS Microbiology Letters
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