Enhanced biomethane production from anthracite by application of an electric field

Guo, Hongguang; Chen, Chao; Liang, Weiguo; Zhang, Yixuan; Duan, Kaixin; Zhang, Panpan

doi:10.1016/j.coal.2020.103393

Cited by 29 publications

(18 citation statements)

References 70 publications

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“…For example, Penicillium, Aspergillus , and Trichoderma all had an outstanding capacity of solubilizing low-rank coal (Ward, 1985 ; Zafra et al, 2015 ; Detman et al, 2018 ). Fusarium is one of the main fungi in the culture of coal degradation that produces methane (Guo et al, 2020a ). Alternaria can provide a more favorable environment for methanogens by reducing sulfur and ash from coal (Guo et al, 2020a ).…”

Section: Resultsmentioning

confidence: 99%

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Enhancing Biomethane Production From Lignite by an Anaerobic Polycyclic Aromatic Hydrocarbon Degrading Fungal Flora Enriched From Produced Water

et al. 2022

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The coal-degrading ability of microorganisms is essential for the formation of biogenic coalbed methane. The ability to degrade the aromatic compound of coal is more important because it is perceived as the main refractory component for bioconversion. In this paper, a polycyclic aromatic hydrocarbon (PAH) degrading fungal community (PF) was enriched from produced water using phenanthrene as sole carbon source. The goal was to improve both the microbial structure of the methanogenic microflora and its coal-degrading ability. Two strategies were pursued. The first used coal pretreatment with PF (PP), followed by methane production by methanogenic microflora; the second used methane production directly from coal by mixed culture of PF and methanogenic microflora (PM). The results showed that methane productions of PP and PM increased by 29.40 and 39.52%, respectively. After 7 days of cultivation, the fungal community has been altered in PP and PM, especially for Penicillium the proportions of which were 67.37 and 89.81% higher than that in methanogenic microflora, respectively. Furthermore, volatile fatty acid accumulations increased by 64.21 and 58.15%, respectively. The 13C-NMR results showed that PF addition promoted the transformation of aromatic carbons in coal to carboxyl and carbonyl carbons, which contributed greatly to the production of methane together with oxygen-containing functional groups. These results suggest that methane production can be increased by indigenous PAH-degrading fungi by improving the fermentation of aromatics in coal and the generation of volatile fatty acids. This provided a feasible method for enhancing biomethane generation in the coal seam.

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Section: Resultsmentioning

confidence: 99%

“…Fusarium is one of the main fungi in the culture of coal degradation that produces methane (Guo et al, 2020a ). Alternaria can provide a more favorable environment for methanogens by reducing sulfur and ash from coal (Guo et al, 2020a ). The composition of the archaeal community is shown in Figure 3 and Supplementary Table 3 .…”

Section: Resultsmentioning

confidence: 99%

Enhancing Biomethane Production From Lignite by an Anaerobic Polycyclic Aromatic Hydrocarbon Degrading Fungal Flora Enriched From Produced Water

et al. 2022

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“…The predominant genus in CW100 changed to Methanosarcina with 87.72% of the sequence reads. Methanosarcina can utilize different substrates, such as CO 2 , H 2 , acetate, and methylamine . Only 3.99% of the sequence reads were grouped into the genus Methanobacterium , and only 1.50% of sequence reads were found in the genus Methanosaeta .…”

Section: Resultsmentioning

confidence: 99%

“…Anaerobic fungi in the bovine rumen are believed to synergistically produce methane with methanogens . However, only a few studies reported the fungal communities in coal seams related to methane production. , Some facultative anaerobic fungi were found in produced water of Qinshui Basin with the potential to degrade plant-derived, aromatic and lignin-like compounds in coal, including Rhodotorula spp., Mortierella spp., Acremonium spp., Fusarium spp., Trichoderma spp., Aspergillus spp., and Schizophyllum spp . In the anaerobic reactor with an electric field, fungi such as Thielavia , Humicola , Mortierella , Trichoderma , Acremonium , and Alternaria were detected, which were related to the degradation of anthracite .…”

Section: Introductionmentioning

confidence: 99%

“…However, only a few studies reported the fungal communities in coal seams related to methane production. , Some facultative anaerobic fungi were found in produced water of Qinshui Basin with the potential to degrade plant-derived, aromatic and lignin-like compounds in coal, including Rhodotorula spp., Mortierella spp., Acremonium spp., Fusarium spp., Trichoderma spp., Aspergillus spp., and Schizophyllum spp . In the anaerobic reactor with an electric field, fungi such as Thielavia , Humicola , Mortierella , Trichoderma , Acremonium , and Alternaria were detected, which were related to the degradation of anthracite . The analysis of fungal communities in the formation of biogenic CBM is limited and the details about the function of fungi in the process of converting coal to methane need to be further determined.…”

Section: Introductionmentioning

confidence: 99%

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High Potential of Methane Production from Coal by Fungi and Hydrogenotrophic Methanogens from Produced Water

et al. 2020

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Studying in situ microorganisms is essential to understand the formation of biogenic coalbed methane (CBM). Only a few studies have investigated the fungi community inhabiting in coal seams although fungi are found to degrade refractory compounds and solubilize coal and even work with methanogens to produce methane. In this study, produced water was collected from Qinshui Basin and used as the source of microflora to degrade coal. The function of fungi was analyzed by inhibition of bacteria with antibiotics. The results have shown that the inhibition of bacteria in the microcosms significantly increased the methane yield. Fungi were more favorable to cooperate with hydrogenotrophic methanogens when bacteria were inhibited as Methanobacterium were the predominant archaea accounting for 45.98–86.98% of the sequence reads. The relatively unchanged fungal community and high volatile fatty acids (VFAs) yields (48.70–85.72%) in the presence of antibiotics might contribute to H2 production to facilitate hydrogenotrophic methanogenesis. On the contrary, the dominant methanogens in microcosms without antibiotics gradually changed from Methanobacterium (89.85%) to Methanoceta (46.19%) and finally to Methanobacterium (87.72%). The bacterial community and organic intermediates have also changed greatly over time, which can be the reason for the succession of the methanogens. These results suggest that fungi in produced water can play an important role in coal biodegradation to produce VFAs and H2 that support hydrogenotrophic methanogenesis, which could be negatively impacted by the existence of bacteria.

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The succession of microorganisms and organics in the process of methane generation by co‐degradation of anthracite and rice straw

Cheng

Duan

et al. 2022

Intl J of Energy Research

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Summary Compared with the biodegradation of coal, the co‐degradation of coal and straw can significantly improve methane production, which is potential to increase biogenic coalbed methane (CBM) production. In the laboratory tests, the succession of microbial communities and organic compounds in the process of methane generation from among degradations of coal (C), rice straw (RS), and coal‐rice straw (CRS) were investigated by using with MiSeq and GC‐MS analytical instruments. The experimental results indicated that methane production in the cultivation CRS was about 12 times higher than that of C. A shift of dominant methanogen in inoculum was observed in the process of co‐degradation from acetoclastic Methanosaeta to methylotrophic Methanomethylovorans on the seventh day, finally to hydrogenotrophic Methanobacterium. The structures of bacteria and fungi also changed significantly in the process of co‐degradation which mainly enriched macromolecules degrading and volatile fatty acids (VFAs) metabolizing microbes to facilitate methane generation. Moreover, the value of pH decreased with enrichment of VFAs, especially butanoic acid, because VFAs were dominant in the intermediates of co‐degradation. The contents of VFAs were negatively corelated with methane production during cultivation suggesting they would contribute to methane production. The component of intermediates in co‐degradation was distinct from those in cultivations of C and RS especially after 7 days as revealed by principal component analysis and heatmap analysis. These results revealed that adding rice straw into coal biodegradation changed the metabolic pathway and methanogenesis in co‐degradation.

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Enhanced biomethane production from anthracite by application of an electric field

Cited by 29 publications

References 70 publications

Enhancing Biomethane Production From Lignite by an Anaerobic Polycyclic Aromatic Hydrocarbon Degrading Fungal Flora Enriched From Produced Water

Enhancing Biomethane Production From Lignite by an Anaerobic Polycyclic Aromatic Hydrocarbon Degrading Fungal Flora Enriched From Produced Water

High Potential of Methane Production from Coal by Fungi and Hydrogenotrophic Methanogens from Produced Water

The succession of microorganisms and organics in the process of methane generation by co‐degradation of anthracite and rice straw

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