Investigation of foaming causes in three mesophilic food waste digesters: reactor performance and microbial analysis

He, Qin; Li, Lei; Zhao, Xiaofei; Li, Qu; Wu, Di; Peng, Xiangjun

doi:10.1038/s41598-017-14258-3

Cited by 49 publications

(23 citation statements)

References 50 publications

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“…In this study, the ammonium-nitrogen concentration increased from 1.05 ± 0.5 to 2.6 ± 0.12 g/L as a result of MFW addition (average of all reactors, from day 0 to 224). Ammonium is in equilibrium with ammonia, a well-known inhibitor of biogas processes (specifically by inhibiting methanogens) [ 40 ], and this could possibly have caused the VFA accumulation followed by foaming. However, taking into account the pH (7.6–7.7) and temperature (37 °C), the level of free ammonia was calculated and found to be at most only around 0.16 g/L.…”

Section: Resultsmentioning

confidence: 99%

Substrate-Induced Response in Biogas Process Performance and Microbial Community Relates Back to Inoculum Source

et al. 2018

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This study investigated whether biogas reactor performance, including microbial community development, in response to a change in substrate composition is influenced by initial inoculum source. For the study, reactors previously operated with the same grass–manure mixture for more than 120 days and started with two different inocula were used. These reactors initially showed great differences depending on inoculum source, but eventually showed similar performance and overall microbial community structure. At the start of the present experiment, the substrate was complemented with milled feed wheat, added all at once or divided into two portions. The starting hypothesis was that process performance depends on initial inoculum source and microbial diversity, and thus that reactor performance is influenced by the feeding regime. In response to the substrate change, all reactors showed increases and decreases in volumetric and specific methane production, respectively. However, specific methane yield and development of the microbial community showed differences related to the initial inoculum source, confirming the hypothesis. However, the different feeding regimes had only minor effects on process performance and overall community structure, but still induced differences in the cellulose-degrading community and in cellulose degradation.

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Section: Resultsmentioning

confidence: 99%

Substrate-Induced Response in Biogas Process Performance and Microbial Community Relates Back to Inoculum Source

et al. 2018

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“…The abundances of Gelria were 12.40%, 1.27 ± 0.27%, 2.20 ± 0.58% and 1.93 ± 0.19% for the Control, 1-1, 2-1, and 1-2 groups, respectively. Gelria can degrade glutamate to ammonia [40]. The control group has the highest abundance, which indicates a significant correlation with ammonia content.…”

Section: Microbial Community At Genus Levelmentioning

confidence: 91%

Long-Term Mesophilic Anaerobic Co-Digestion of Swine Manure with Corn Stover and Microbial Community Analysis

et al. 2020

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Long-term anaerobic co-digestion of swine manure (SM) and corn stover (CS) was conducted using semi-continuously loaded digesters under mesophilic conditions. A preliminary test was first conducted to test the effects of loading rates, and results indicated the 3 g-VS L−1 d−1 was the optimal loading rate. Based on the preliminary results, a verification replicated test was conducted with 3 g-VS L−1 d−1 loading rate and different SM/CS ratios (1:1, 2:1 and 1:2). Results showed that a SM/CS ratio of 2/1 was optimal, based on maximum observed methane-VSdes generation and carbon conversion efficiency (72.56 ± 3.40 mL g−1 and 40.59%, respectively). Amplicon sequencing analysis suggested that microbial diversity was increased with CS loading. Amino-acid-degrading bacteria were abundant in the treatment groups. Archaea Methanoculleus could enhance biogas and methane productions.

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“…[12] Syntrophaceticus SAOB [47] De uviitalea Acid-producing bacteria. [28] Norank_f__Syntrophomonadaceae Syntrophic butyrate oxidizers in anoxic environments.…”

Section: Mobilitaleamentioning

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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Investigation of foaming causes in three mesophilic food waste digesters: reactor performance and microbial analysis

Cited by 49 publications

References 50 publications

Substrate-Induced Response in Biogas Process Performance and Microbial Community Relates Back to Inoculum Source

Substrate-Induced Response in Biogas Process Performance and Microbial Community Relates Back to Inoculum Source

Long-Term Mesophilic Anaerobic Co-Digestion of Swine Manure with Corn Stover and Microbial Community Analysis

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

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