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Acidogenic gas utilization improves methane production in high-load digestion: Underlying mechanisms

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  • Yellezuome, Dominic
  • Zhu, Xianpu
  • Liu, Xuwei
  • Liu, Ronghou
  • Sun, Chen
  • Abd-Alla, Mohamed Hemida
  • Rasmey, Abdel-Hamied M.

Abstract

High-load reactors face a significant challenge with fatty acid accumulation. Although injecting acidogenic gas (H2 and CO2) into methanogenic reactors improves biogas production, its mechanisms and stability enhancement remain unclear. Therefore, this study investigated the potential of using acidogenic gas to enhance methane production and system stability in a high substrate-loading co-digestion system with decreasing hydraulic retention time (HRT) and its regulatory role by considering biological pathways. Acidogenic gas injection effectively managed volatile fatty acid accumulation, with a concomitant increase in methane production from 0.042 to 0.066 L/L h as HRT decreased (16–8 days). However, the methane yield decreased from 611 to 460 mL/g volatile solids. Microbial community analysis revealed an increased abundance of hydrogenotrophic methanogens, along with several acidogenic and syntrophic fatty acid oxidizing consortia with decreasing HRT. The HRT10.67 sample exhibited the highest microbial species diversity and richness in the methanogenic reactor. Metabolomics analysis showed acidogenic gas reduced energy synthesis related to the tri-carboxylic acid cycle and oxidative phosphorylation while profoundly regulating the metabolism of amino acids, lipids, fatty acids, membrane transporters and inhibitory substances, thereby strengthening methane metabolism pathways. This study provides valuable insights into the roles of acidogenic gas in regulating energy metabolism to enhance methane production and offers potential opportunities for improving lipid and protein degradation.

Suggested Citation

  • Yellezuome, Dominic & Zhu, Xianpu & Liu, Xuwei & Liu, Ronghou & Sun, Chen & Abd-Alla, Mohamed Hemida & Rasmey, Abdel-Hamied M., 2024. "Acidogenic gas utilization improves methane production in high-load digestion: Underlying mechanisms," Renewable and Sustainable Energy Reviews, Elsevier, vol. 202(C).
    • Handle: RePEc:eee:rensus:v:202:y:2024:i:c:s1364032124004246
    DOI: 10.1016/j.rser.2024.114698
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    References listed on IDEAS

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    1. Zhong, Yuan & Chen, Rui & Rojas-Sossa, Juan-Pablo & Isaguirre, Christine & Mashburn, Austin & Marsh, Terence & Liu, Yan & Liao, Wei, 2020. "Anaerobic co-digestion of energy crop and agricultural wastes to prepare uniform-format cellulosic feedstock for biorefining," Renewable Energy, Elsevier, vol. 147(P1), pages 1358-1370.
    2. Srisowmeya, G. & Chakravarthy, M. & Nandhini Devi, G., 2020. "Critical considerations in two-stage anaerobic digestion of food waste – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
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