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Effects of co-digestion of cucumber residues to corn stover and pig manure ratio on methane production in solid state anaerobic digestion
- Wang, Yaya, Li, Guoxue, Chi, Menghao, Sun, Yanbo, Zhang, Jiaxing, Jiang, Shixu, Cui, Zongjun
- Bioresource technology 2018 v.250 pp. 328-336
- Bacteroidetes, Firmicutes, Methanosaeta, Synergistetes, anaerobic digestion, bacteria, community structure, corn stover, cucumbers, methane production, microbial communities, mixing, pig manure
- 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.