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Bioaugmentation strategies based on bacterial and methanogenic cultures to relieve stress in anaerobic digestion of protein-rich substrates

Author

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  • Agostini, Sara
  • Bucci, Luca
  • Doni, Davide
  • Costantini, Paola
  • Gupte, Ameya
  • Müller, Bettina
  • Sibilla, Fabrizio
  • Basaglia, Marina
  • Casella, Sergio
  • Kougias, Panagiotis G.
  • Campanaro, Stefano
  • Favaro, Lorenzo
  • Treu, Laura

Abstract

Anaerobic co-digestion of protein-rich substrates is a prominent strategy for converting valuable feedstocks into methane, but it releases ammonia, which can inhibit the overall process. This study developed a cutting-edge combined culturomic and metagenomic approach to investigate the microbial composition of an ammonia-tolerant biogas plant. Newly-isolated microorganisms were used for bioaugmentation of stressed batch reactors fed with casein, maize silage and their combination. A co-culture enriched with proteolytic bacteria was isolated, selected and compared with the proteolytic collection strain Pseudomonas lundensis DSM6252. The co-culture and P. lundensis were combined with the ammonia-resistant archaeon Methanoculleus bourgensis MS2 to boost process stability. A microbial population pre-adapted to casein was also tested for evaluating the digestion of protein-rich feedstock. The promising results suggest combining proteolytic bacteria and M. bourgensis could exploit microbial co-cultures to improve anaerobic digestion stability and ensure stable productivity even under the harshest of ammonia conditions.

Suggested Citation

  • Agostini, Sara & Bucci, Luca & Doni, Davide & Costantini, Paola & Gupte, Ameya & Müller, Bettina & Sibilla, Fabrizio & Basaglia, Marina & Casella, Sergio & Kougias, Panagiotis G. & Campanaro, Stefano , 2024. "Bioaugmentation strategies based on bacterial and methanogenic cultures to relieve stress in anaerobic digestion of protein-rich substrates," Renewable Energy, Elsevier, vol. 225(C).
    • Handle: RePEc:eee:renene:v:225:y:2024:i:c:s0960148124003355
    DOI: 10.1016/j.renene.2024.120270
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    References listed on IDEAS

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    4. Bi, Shaojie & Westerholm, Maria & Hu, Wanrong & Mahdy, Ahmed & Dong, Taili & Sun, Yingcai & Qiao, Wei & Dong, Renjie, 2021. "The metabolic performance and microbial communities of anaerobic digestion of chicken manure under stressed ammonia condition: A case study of a 10-year successful biogas plant," Renewable Energy, Elsevier, vol. 167(C), pages 644-651.
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