Thermophilic anaerobic conversion of raw microalgae: Microbial community diversity in high solids retention systems

Zamorano-López, N.; Greses, Silvia; Aguado, Daniel; Seco, A.; Borrás, L.

doi:10.1016/j.algal.2019.101533

Cited by 17 publications

(3 citation statements)

References 44 publications

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“…27,28 Hydrogenispora, Acetomicrobium, and Candidatus Caldatribacterium have also been reported to function in hydrogen and acid production in the AD system. 29,30 In this study, these acidogens were the dominant genera during the first four stages (Ta, Tb, Tc, and Td), indicating that acidogenesis continued to be active during these stages. Among the archaea, Methanothermobacter functions as a hydrogenotrophic methanogen, while Methanosarcina functions as a mixotrophic (acetoclastic, hydrogenotrophic, and methylotrophic) methanogen.…”

Section: Energy and Fuelssupporting

confidence: 51%

“…Defluviitoga has been reported to be abundant in a thermophilic reactor, where it can degrade amino acids and organic acids to form acetate, hydrogen, and carbon dioxide. , Hydrogenispora, Acetomicrobium, and Candidatus Caldatribacterium have also been reported to function in hydrogen and acid production in the AD system. , In this study, these acidogens were the dominant genera during the first four stages (Ta, Tb, Tc, and Td), indicating that acidogenesis continued to be active during these stages. Among the archaea, Methanothermobacter functions as a hydrogenotrophic methanogen, while Methanosarcina functions as a mixotrophic (acetoclastic, hydrogenotrophic, and methylotrophic) methanogen. , The proportion of Methanosarcina was much lower than that of Methanothermobacter during the overall process, indicating that the dominant methanogenic reaction performed by Methanothermobacter consisted of H 2 and CO 2 consumption to produce CH 4 .…”

Section: Resultsmentioning

confidence: 53%

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Anaerobic Thermophilic Digestion of Maotai-Flavored Distiller’s Grains: Process Performance and Microbial Community Dynamics

Chen

et al. 2019

Energy Fuels

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Improperly disposed Maotai-flavored distiller's grains (MDGs) cause environmental pollution. However, the high organic matter and moisture contents in MDG make this byproduct suitable for anaerobic digestion. The performance and stability of thermophilic anaerobic digestion were evaluated at an organic loading rate of 3 g VS/(L•d) and a working volume of 55 L. The microbial community dynamics were analyzed by high-throughput illumina pyrosequencing. A volumetric biogas production rate of 1.30 L/(L•d) was obtained upon reaching stability by diluting the feed without effluent recirculation. Defluviitoga, Candidatus Caldatribacterium, Hydrogenispora, Acetomicrobium, Methanosarcina, and Methanothermobacter were the dominant acidogenic and methanogenic genera. Recirculating the effluent without dilution caused acidification and instability due to its high levels of lactic (74 g/kg), acetic (31 g/kg), and succinic (24 g/kg) acids originally present in MDGs. Once acidified, the digester failed to recover using control measures such as halting effluent recirculation, adding trace elements, stopping feeding, and adding inoculum.

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Section: Energy and Fuelssupporting

confidence: 51%

Section: Resultsmentioning

confidence: 53%

Anaerobic Thermophilic Digestion of Maotai-Flavored Distiller’s Grains: Process Performance and Microbial Community Dynamics

Chen

et al. 2019

Energy Fuels

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“…When the mesophilic anaerobic system collapsed, the abundance of Bacteroidetes notably increased, followed by a slight increase in the Thermotogae, indicating that these two phyla were more tolerant to the acidi ed condition. The Bacteroidetes and Thermotogae phyla play a signi cant role in the degradation of cellulose and protein under anaerobic conditions [18,21]. The phyla of Spirochaetae, which existed uniquely in the collapsed stage, could be used as a microbial early warning indicator for the AD instability of VW.…”

Section: Dynamics Of Microbial Community Composition On Phylum Levelmentioning

confidence: 99%

Comparison of functional microbial profile between mesophilic and thermophilic anaerobic digestion of vegetable waste

Ao¹,

Xie²,

Zhou³

et al. 2020

Preprint

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Background With increasing accumulation of vegetable waste in China, the valorization of vegetable waste becomes an urgent concern. Based on the characteristics of high moisture content and biodegradable organic matter of vegetable waste, anaerobic digestion as an effective technique was selected to reuse this kind of agriculture waste. The anaerobic digestion performance is highly correlated with the functional microbial community. In this study, mesophilic and thermophilic digestions of vegetable waste were conducted, and dynamics of the microbial community were investigated. Results The mesophilic and thermophilic collapsed stages occurred at organic loading rates of 1.5 and 2.0 g volatile solid (VS)/(L·d), respectively, due to severe accumulation of volatile fatty acids. 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 Candidatus_Cloacamonas, norank_f__Synergistaceae, Methanosaeta, and Methanosarcina in the mesophilic stable stage, and Anaerobaculum, Syntrophaceticus, Methanosarcina, and Methanothermobacter in thermophilic stable stage. Spirochaetae and Thermotogae phyla were the characteristic microorganisms in the mesophilic and thermophilic collapsed stages, respectively. Conclusions This study unveiled the distribution of the functional microbial consortia at the stable and collapsed periods of the anaerobic digestion of vegetable waste under mesophilic and thermophilic conditions to providing guidelines for the further research of anaerobic digestion of vegetable waste.

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Comparison of microbial community structures between mesophilic and thermophilic anaerobic digestion of vegetable waste

Xie

Zhou

et al. 2021

Bioprocess Biosyst Eng

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Thermophilic anaerobic conversion of raw microalgae: Microbial community diversity in high solids retention systems

Cited by 17 publications

References 44 publications

Anaerobic Thermophilic Digestion of Maotai-Flavored Distiller’s Grains: Process Performance and Microbial Community Dynamics

Anaerobic Thermophilic Digestion of Maotai-Flavored Distiller’s Grains: Process Performance and Microbial Community Dynamics

Comparison of functional microbial profile between mesophilic and thermophilic anaerobic digestion of vegetable waste

Comparison of microbial community structures between mesophilic and thermophilic anaerobic digestion of vegetable waste

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