Journal
BIORESOURCE TECHNOLOGY
Volume 250, Issue -, Pages 328-336Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.11.055
Keywords
Solid state anaerobic digestion; Co-digestion; Methane yield; Cucumber residues; Microbiological community
Funding
- National Key R&D Program of China [2016YFD0800202]
- Research Project in Cashmere Goat Industry of China [CARS-39-19]
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This study investigated the performance of co-digesting cucumber residues, corn stover, and pig manure at different ratios. Microbial community structure was analyzed to elucidate functional microorganism contributing to methane production during co-digestion. Results show that mixing cucumber residues with pig manure and corn stover could significantly improved methane yields 1.27-3.46 times higher than mono-feedstock. The methane yields decreased with the cucumber residues increasing when the pig manure ratio was fixed at 4 and 3, and was opposite at ratio 5. The optimal mixture ratio was T2 with the highest methane yield (305.4 mL/g VS) and co-digestion performance index (1.97). The main microbiological community in T2 was bacteria of Firmicutes (44.6%), Bacteroidetes (32.5%), Synergistetes (3.8%) and archaea of Methanosaeta (37.1%), Methanospirillum (18.2%). The mixture ratios changed the microbial community structures. The adding proportion of cucumber residues changed the community composition of the archaea, especially the proportion of Methanosaeta.
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