Anaerobic co-digestion of agricultural by-products with manure, for enhanced biogas production

Marie M. Søndergaard, Ioannis Fotidis, Adam Kovalovszki, Irini Angelidaki

Research output: Contribution to journalJournal articleResearchpeer-review


Biogas is extensively promoted as a promising renewable energy. Therefore, the search of appropriate co-substrates has come into focus. In this study, we examined the potential of using agricultural byproducts as alternative co-substrates for increased biogas production. The biochemical methane potential (BMP) of six agricultural organic byproducts were tested. Consecutively, the byproduct with the highest BMP was used as a co-digestion substrate with manure, in a continuous stirred tank reactor (CSTR). Meadow grass had the highest BMP value [388 ± 30 NmL of CH4 g–1 of volatile solids (VS)] among all mono-substrates tested. On the basis of BMP, the substrates ranked as follows: meadow grass > spring barley, winter wheat, winter barley, ryegrass > rapeseed > manure. Co-digestion of manure with byproducts resulted in only an additive and not synergistic methane production. Continuous co-digestion of 34 g L–1 raw meadow grass with manure increased the methane production rate of the CSTR reactor by 114% compared to the manure alone.
Original languageEnglish
JournalEnergy & Fuels
Issue number12
Pages (from-to)8088-8094
Publication statusPublished - 2015


  • Anaerobic digestion
  • BMP
  • CSTR reactor
  • Milled straw
  • Meadow grass

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