Abstract
The bacterial and archaeal communities of two full-scale biogas producing plants (P1 and P2), associated with a 999 kW cogeneration unit, both located in North Italy, were analyzed at start up and fully operating phases, by means of various molecular approaches: (i) Automated Ribosomal Intergenic Spacer Analysis; (ii) cloning and sequencing of PCR amplicons of archaeal genes 16Srrna and mcrA; (iii) 16S rDNA high throughput next generation sequencing. P1 and P2 use the same technology and both were fed with cattle manure and corn silage. During the study of P1 also the post digester (fed with pig manure) was analyzed. The aim of this research was to characterize the bacterial and archaeal communities in two very similar plants to profile the core microbiota. The results of this analysis highlighted that the two plants (producing comparable quantities of volatile fatty acids, biogas, and energy) differed in anerobic microbiota (Bacteria and Archaea). Notably the methanogenic community of P1 was dominated by the strict acetoclastic Methanosaeta (Methanothrix) (up to 23.05%) and the unculturable Candidatus Methanofastidiosum (up to 32.70%), while P2 was dominated by the acetoclastic, but more substrate-versatile, Methanosarcina archaeal genus (49.19%). The data demonstrated that the performances of plants with identical design, in similar operating conditions, yielding comparable amount of biogas (average of 7237 m3 day−1 and 7916 m3 day−1 respectively for P1 and P2), VFA (1643 mg L−1 and 1634 mg L−1) and energy recovery (23.90–24 MWh day−1), depend on the stabilization of effective and functionally optimized methanogenic communities, but these communities are taxonomically different in the two biodigesters.
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Data are available within the article. NGS and conventional sequences are available in GenBank (https://www.ncbi.nlm.nih.gov/genbank/).
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This research was supported by funds to Prof. Anna Maria Sanangelantoni from FIL, of the University of Parma Local Funding for Research.
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CA: formal analysis, data curation, writing- original draft preparation. GV: validation, writing—review and editing. AMS: conceptualization, methodology, investigation, writing and reviewing. GF: sample and data collection.
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Agrimonti, C., Visioli, G., Ferrari, G. et al. Comparison of Bacterial and Archaeal Microbiome in Two Bioreactors Fed with Cattle Sewage and Corn Biomass. Waste Biomass Valor 13, 4533–4547 (2022). https://doi.org/10.1007/s12649-022-01802-0
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DOI: https://doi.org/10.1007/s12649-022-01802-0