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Co-digestion of cow and sheep manure: Performance evaluation and relative microbial activity

Li, Y., Achinas, S., Zhao, J., Geurkink, B., Krooneman, J. & Willem Euverink, G. J., Jun-2020, In : Renewable Energy. 153, p. 553-563 11 p.

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This study evaluated the performance of anaerobic co-digestion of cow manure (CM) and sheep manure (SM) in both batch and continuous digesters at 37 degrees C. Synergistic effects of co-digesting CM and SM at varying volatile solids (VS) ratios (1:0, 0:1, 3:1, 1:1, 1:3) were observed in the batch experiment, with the most effective degradation of cellulose (56%) and hemicellulose (55%), and thus, the highest cumulative methane yield (210 mL/gVS(added)) obtained at a CM:SM ratio of 1:3. Co-digesting CM and SM improved the hydrolysis, as evidenced by the cellulase brought by SM and the increases of cellulolytic bacteria Clostridium. Besides, co-digestion enhanced the acidogenesis and methanogenesis, reflected by the enrichment of syntrophic bacteria Candidatus Cloacimonas and hydrogenotrophic archaea Methanoculleus (Coenzyme-B sulfoethylthiotransferase). When testing continuous digestion, the methane yield increased from 146 mL/gVS/d (CM alone) to 179 mL/gVS/d (CM:SM at 1:1) at a constant organic loading rate (OLR) of 1g VS/L/d and a hydraulic retention time (HRT) of 25 days. Furthermore, the anaerobic digestion process was enhanced when the daily feed changed back to CM alone, reflected by the improved daily methane yield (159 mL/VS/d). These results provided insights into the improvement of methane production during the anaerobic digestion of animal manure. (C) 2020 The Authors. Published by Elsevier Ltd.

Original languageEnglish
Pages (from-to)553-563
Number of pages11
JournalRenewable Energy
Volume153
Early online date14-Feb-2020
Publication statusPublished - Jun-2020

    Keywords

  • Anaerobic co-digestion, Cow manure, Microbial community, Sheep manure

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