Abstract
The anaerobic digestion performance correlates with the functional microbial community. Mesophilic and thermophilic digestions of vegetable waste were conducted, and dynamics of the microbial community were investigated. The mesophilic and thermophilic collapsed stages occurred at organic loading rates of 1.5 and 2.0 g VS/(L d) due to the accumulation of volatile fatty acids with final concentrations of 2276 and 6476 mg/L, respectively. A high concentration of volatile fatty acids caused the severe inhibition of methanogens, which finally led to the imbalance between acetogenesis and methanogenesis. The mesophilic digestion exhibited a higher microbial diversity and richness than the thermophilic digestion. Syntrophic acetate-oxidizing coupled with hydrogenotrophic methanogenesis was the dominant pathway in the thermophilic stable system, and acetoclastic methanogenesis in the mesophilic stable system. The dominant acidogens, syntrophus, and methanogens were unclassified_f__Anaerolineaceae (8.68%), Candidatus_Cloacamonas (19.70%), Methanosaeta (6.10%), and Methanosarcina (4.08%) in the mesophilic stable stage, and Anaerobaculum (12.59%), Syntrophaceticus (4.84%), Methanosarcina (30.58%), and Methanothermobacter (3.17%) in thermophilic stable stage. Spirochaetae and Thermotogae phyla were the characteristic microorganisms in the mesophilic and thermophilic collapsed stages, respectively. These findings provided valuable information for the deep understanding of the difference of the microbial community and methane-producing mechanism between mesophilic and thermophilic digestion of vegetable waste.
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Acknowledgements
This research was supported jointly by the National Key R&D Program of China (2019YFD1100603), the Key R&D Program of Jiangxi Province (20182ABC28006), Sichuan Province Science and Technology Support Program (2020ZHZY0008, 2020ZYD022, 2021ZHZY0016), the CAS “Light of West China” Program (2018XBZG_XBQNXZ_A_004, 2019XBZG_JCTD_ZDSYS_001), the Youth Innovation Promotion Association of CAS (2017423), Special fund for talented persons of Sichuan provincial Party Committee Organization Department. The data were analyzed on the free online platform of Majorbio I-sanger Cloud Platform (http://www.i-sanger.com).
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Ao, T., Xie, Z., Zhou, P. et al. Comparison of microbial community structures between mesophilic and thermophilic anaerobic digestion of vegetable waste. Bioprocess Biosyst Eng 44, 1201–1214 (2021). https://doi.org/10.1007/s00449-021-02519-5
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DOI: https://doi.org/10.1007/s00449-021-02519-5