Shifts of microbial community structure during anaerobic digestion of agro-industrial energetic crops and food industry byproducts

Giuseppe Merlino, Aurora Rizzi, Federica Villa, Claudia Sorlini, Massimo Brambilla, Pierluigi Navarotto, Barbara Bertazzoni, Matteo Zagni, Fabio Araldi, Daniele Daffonchio*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Background: Much research has been done on biochemical methane potential (BMP) determinations. However, although anaerobic digestion for methane production is driven by microorganisms, little information is available on the microbial community response to different organic residues. The aim of this study was to characterize the microbial communities during the treatment of different organic matrices. Results: BMP were comparable for energy crops and several agro-industrial biomasses. Denaturing gradient gel electrophoresis (DGGE) showed the dominance of clostridia and Methanosarcina. Principal component analyses of PCR-DGGE profiles indicated microbial shifts between the start and end of the processes. Microbial communities showed similar structures that, in particular for Archaea, clustered together independently of the nature of the matrix treated. Bacterial communities were richer, more dynamic and even than archaeal ones. Real-time quantitative PCR revealed that the Methanosarcinales dominated the archaeal community while sulphate-reducing bacteria were present at low titers. A statistically significant correlation indicated that more even archaeal communities were associated with higher BMP. Conclusion: Different shifts occurred between Archaea and Bacteria exposed to different matrices treated by anaerobic digestion. While bacterial communities varied relatively widely, convergent archaeal community structures were selected in response to different biomasses treated.

Original languageEnglish (US)
Pages (from-to)1302-1311
Number of pages10
JournalJournal of Chemical Technology and Biotechnology
Volume87
Issue number9
DOIs
StatePublished - Sep 1 2012

Keywords

  • Anaerobic digestion
  • Biomasses
  • Methane potential
  • Microbial communities
  • PCR-DGGE
  • Real-time PCR

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Waste Management and Disposal
  • Pollution
  • Organic Chemistry
  • Inorganic Chemistry

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