Microbial profiling during anaerobic digestion of cheese whey in reactors operated at different conditions

Laura Treu, Panagiotis Tsapekos*, Maria Peprah, Stefano Campanaro, Alessio Giacomini, Viviana Corich, Panagiotis Kougias, Irini Angelidaki

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This study investigates the efficiency in methane production of lab-scale mesophilic (37 °C) and thermophilic (54 °C) continuous stirred tank reactors fed with cheese whey at different operational conditions. Results showed that whey mono-digestion was feasible at mesophilic conditions, while at thermophilic conditions frequent acidification incidents were recorded. The limited buffer capacity of the influent feedstock was responsible for the unstable anaerobic digestion process. The co-digestion of cheese whey with cattle manure maintained the pH levels higher than 7.0, and therefore, stable methane production rates were achieved without any significant accumulation of volatile fatty acids. An additional enhancement of the methane productivity was achieved by in-situ H2 dispersion. Microbial community composition was investigated using high-throughput 16S rRNA gene amplicon sequencing and results were correlated with process parameters. Hydrogenotrophic methanogens were the dominant archaea during the whole experiment at mesophilic and thermophilic conditions.
Original languageEnglish
JournalBioresource Technology
Volume275
Pages (from-to)375-385
ISSN0960-8524
DOIs
Publication statusPublished - 2019

Keywords

  • Cheese whey
  • Hydrogenotrophic methanogenesis
  • In-situ H(2) dispersion
  • Mesophilic microbial community
  • Methane production rate
  • Thermophilic microbial community

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