An explanation of the methanogenic pathway for methane production in anaerobic digestion of nitrogen-rich materials under mesophilic and thermophilic conditions

Yin, Daqiang; Westerholm, Maria; Qiao, Wei; Bi, Shaojie; Wandera, Simon M.; Fan, Ruixin; Jiang, Mengmeng; Dong, Renjie

doi:10.1016/j.biortech.2018.05.062

Cited by 87 publications

(30 citation statements)

References 29 publications

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“…In critical HRTs, the accumulation of VFAs and the drop in pH to values ranged from 5.6 to 6.3 occurred indicating the inhibition of the systems. It has been reported that acetotrophic methanogens are strongly inhibited below a pH of 6.2 [41]. Figure 4 shows the average values of pH in each stage (HRTs) for the three SSTRs.…”

Section: Methane Production Yields and Process Efficiencymentioning

confidence: 98%

“…Nevertheless, recent studies found that in the anaerobic digestion of nitrogen-rich substrates, the methanogenesis shift from acetoclastic pathways to the syntrophic acetate oxidation-hydrogenotrophic (SAO-HM) route [39][40][41]. In a recent study by Yin et al [41], the authors attempted to explain methanogenic pathways in anaerobic digestion of nitrogen-rich substrates. The authors studied acetate conversion by C 13 isotope under mesophilic and thermophilic conditions.…”

Section: Methane Production Yields and Process Efficiencymentioning

confidence: 99%

“…According to Smith and Mah [38] and from the results of their research using C 14 tracers in an AD study of sludge, authors observed that the 73% of the total methane produced in an anaerobic process comes from the acetoclastic pathway, while the 27% usually comes from the hydrogenutilizing pathway. Nevertheless, recent studies found that in the anaerobic digestion of nitrogen-rich substrates, the methanogenesis shift from acetoclastic pathways to the syntrophic acetate oxidationhydrogenotrophic (SAO-HM) route [39][40][41]. In a recent study by Yin et al [41], the authors attempted to explain methanogenic pathways in anaerobic digestion of nitrogen-rich substrates.…”

Section: Methane Production Yields and Process Efficiencymentioning

confidence: 99%

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Insights into Anaerobic Co-Digestion of Lignocellulosic Biomass (Sugar Beet By-Products) and Animal Manure in Long-Term Semi-Continuous Assays

et al. 2020

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Biogas production through anaerobic digestion has proven to be one of the most important pillars of the transition into the circular economy concept, a sustainable approach for biorefinery. This work aims to extend and improve knowledge in the anaerobic co-digestion of complementary substrates, given insights into wastes biodegradability and the influence of manure composition on the anaerobic process stability. Anaerobic co-digestion of sugar beet by-products with two kinds of animal manure (pig and cow) was investigated in semi-continuous assays, analyzing both common and non-classical parameters. Co-digestion with manure clearly mitigated the inhibitory effect of volatile fatty acids at high organic loading rates, leading to increases in methane production by 70% and 31% in comparison with individual digestion of sugar beet by-products, for co-digestion with pig and cow manure, respectively. Non-classical parameters could give more insight into the coupling/uncoupling of the anaerobic digestion phases and the involved microorganisms. Indirect parameters indicated that the process failure at the critical organic loading rates was mainly due to methanogenesis inhibition in the co-digestion with pig manure, while in co-digestion with cow manure or in individual digestion of sugar beet by-products, both hydrolysis–acidogenesis and methanogenesis phases were affected. Biomethanation degree refers to the maximum methane potential of organic wastes. Sugar beet by-products required a long digestion-time to reach high biodegradability. However, short digestion-times for co-digestion assays led to a high biomethanation degree.

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Section: Methane Production Yields and Process Efficiencymentioning

confidence: 98%

Section: Methane Production Yields and Process Efficiencymentioning

confidence: 99%

Section: Methane Production Yields and Process Efficiencymentioning

confidence: 99%

See 1 more Smart Citation

Insights into Anaerobic Co-Digestion of Lignocellulosic Biomass (Sugar Beet By-Products) and Animal Manure in Long-Term Semi-Continuous Assays

et al. 2020

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“…Samples were stored at -20°C until being analysed. DNA extraction, 16S rRNA amplification, PCR procedures and sequencing libraries were operated according to previous studies (Yin et al, 2018). Representative sequences were filtered for each operational taxonomic unit (OUT).…”

Section: S Rrna Sequencesmentioning

confidence: 99%

“…2c, and 2d). The genus Methanoculleus clearly dominated at OLR of 10.2 g VS L-1d-1 (86.9%) and OLR of 17.1 g VS L-1d-1 (52.8%).Methanoculleus has been reported to be a very efficient hydrogen-utilizing methanogen during the thermophilic AD of chicken manure (Bayrakdar et al, 2017) and it acts as an important partner withClostridium ultunenes (Yin et al, 2018). The increased OLR to 17.1 g VS L-1d-1, as previously stated, reduced the presence of Methanoculleus , and coincided with the VFA accumulation and the reduction of methane production (Fig.…”

Section: Microbial Communities Under Well-performed and Disturbed States Targeting Olrmentioning

confidence: 99%

Anaerobic digestion concert of agro-food wastes and the correlated microbial population dynamics under suboptimal, well-performed and disturbed states

Yin¹,

Mahdy²,

Liu³

et al.

Authorea

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The comparison among microbial interactions during the stable performance of anaerobic digestion (AD) and the process disturbances is still lack and could limit the prediction of process failure and the possible recovery. This study aimed at characterizing the process performance and microbial communities' profiles during the stable and disturbed states of long-term thermophilic AD process fed with agro-food wastes. The disturbances were induced in two stages, firstly under a stepwise increase of organic loading rate (OLR), and then through the reduction in hydraulic retention time (HRT). Volatile fatty acids (VFAs) only accumulated (4730 mg L-1) when OLR increased to 17 g VS L-1 d-1, and consequently methane yield deteriorated by 47%, implying process overloading and thus AD process was partially inhibited. Process disturbances led to 30% reduction in relative abundance of Defluviitoga and Methanoculleus which were partially displaced by Clostridium and Methanomassiliicoccus, implying that the process acidification immediately reflected on microbial profile and the microbes were functionally redundant. Microorganisms' washout was the main reason behind methane yield drop under finite digestion time (1.5d). Microbial profiles shaping showed the robustness of AD process due to the functionally redundant microorganisms and could be strategically used to control and optimize AD process.

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Anaerobic digestion

Rehman

Iqbal

Chang

et al. 2019

Water Environment Research

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Worldwide waste generation has become a topic of interest since the accumulation of this waste has prompted environmental hazards. Among which, anaerobic digestion provides green and efficient alternate solution for removal of toxic waste and energy production. Therefore, this review emphasizes on the recent data published in 2018 on topics related to anaerobic process, enhancement of biogas production, and fermentation efficiency. Furthermore, more focus was made on the factors influencing anaerobic digestion and the effect of trace elements as ionic salts as well as nanoparticles on overall biogas production, respectively.Practitioner points Anaerobic digestion provide green and efficient alternate solution to deal with. This review focused on the conditions related to anaerobic process to improve biogas production and fermentation efficiency. The trace elements were focused on how to influence biogas production during anaerobic digestion.

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An explanation of the methanogenic pathway for methane production in anaerobic digestion of nitrogen-rich materials under mesophilic and thermophilic conditions

Cited by 87 publications

References 29 publications

Insights into Anaerobic Co-Digestion of Lignocellulosic Biomass (Sugar Beet By-Products) and Animal Manure in Long-Term Semi-Continuous Assays

Insights into Anaerobic Co-Digestion of Lignocellulosic Biomass (Sugar Beet By-Products) and Animal Manure in Long-Term Semi-Continuous Assays

Anaerobic digestion concert of agro-food wastes and the correlated microbial population dynamics under suboptimal, well-performed and disturbed states

Anaerobic digestion

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