1. Anaerobic co-digestion of Chinese cabbage waste and cow manure at mesophilic and thermophilic temperatures: Digestion performance, microbial community, and biogas slurry fertility.
- Author
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Liu, Yi, Wang, Tianfeng, Xing, Zhijie, Ma, Yaopeng, Nan, Fuxiong, Pan, Lei, and Chen, Jixiang
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CATTLE manure , *BIOGAS production , *CHINESE cabbage , *BIOGAS , *MICROBIAL communities , *SLURRY , *DIGESTION , *PLANT growth - Abstract
[Display omitted] • Methane yield of thermophilic digester is greater than that of mesophilic digester. • Bacterial and archaeal diversity of mesophilic digesters is more abundant. • Plant growth promotion of mesophilic biogas slurry is more prominent. • Potassium in biogas slurry is the key factor to promote plant growth. The objective of this study was to investigate the effects of mixing ratios of Chinese cabbage waste (CCW) and cow manure (CM) on methane yields, microbial community, and biogas slurry fertility during anaerobic co-digestion. Batch experiments were conducted at mesophilic and thermophilic temperatures with five different CCW/CM mixing ratios. Methane yields at mesophilic and thermophilic temperatures were 4.2–184.4 mL g−1 Volatile solids added (mL g−1 VS added) and 11.8–321.7 mL g−1 VS added , respectively. The richness and diversity of bacteria and archaea at mesophilic temperatures were higher than those at thermophilic temperatures. Compared with the unfertilized control, the dry weight of corn seedlings with the follow-up application of mesophilic or thermophilic biogas slurry increased by 12.3 %-73.4 % or 16.8 %-43.3 %, respectively. This study demonstrates that thermophilic temperatures are conducive to increasing methane yields, but mesophilic temperatures are conducive to improving the biogas slurry fertility. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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