Microbial electrolysis enhanced bioconversion of coal to methane compared with anaerobic digestion: Insights into differences in metabolic pathways

Zhao, Weizhong; Su, Xinming; Zhang, Yifeng; Xia, Daping; Hou, Shihui; Zhou, Yixuan; Fu, Hengzhi; Wang, Lufei; Yin, Xue‐Bo

doi:10.1016/j.enconman.2022.115553

Cited by 46 publications

(6 citation statements)

References 78 publications

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“…Clearly, the applied current in an MEC was more effective in reducing CO 2 to CH 4 . Consistent with our observation is the fact that others have also shown methane production in MEC to increase by ~40% as compared to conventional anaerobic digestion [34].…”

Section: Biogas Collected In the Presence And Absence Of Kohsupporting

confidence: 93%

Enhancement of Biogas (Methane) Production from Cow Dung Using a Microbial Electrochemical Cell and Molecular Characterization of Isolated Methanogenic Bacteria

Bhatt,

Poudyal,

Dhungana

et al. 2024

Biomass

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Biogas has long been used as a household cooking fuel in many tropical counties, and it has the potential to be a significant energy source beyond household cooking fuel. In this study, we describe the use of low electrical energy input in an anaerobic digestion process using a microbial electrochemical cell (MEC) to promote methane content in biogas at 18, 28, and 37 °C. Although the maximum amount of biogas production was at 37 °C (25 cm3), biogas could be effectively produced at lower temperatures, i.e., 18 (13 cm3) and 28 °C (19 cm3), with an external 2 V power input. The biogas production of 13 cm3 obtained at 18 °C was ~65-fold higher than the biogas produced without an external power supply (0.2 cm3). This was further enhanced by 23% using carbon-nanotubes-treated (CNT) graphite electrodes. This suggests that the MEC can be operated at as low as 18 °C and still produce significant amounts of biogas. The share of CH4 in biogas produced in the controls was 30%, whereas the biogas produced in an MEC had 80% CH4. The MEC effectively reduced COD to 42%, whereas it consumed 98% of reducing sugars. Accordingly, it is a suitable method for waste/manure treatment. Molecular characterization using 16s rRNA sequencing confirmed the presence of methanogenic bacteria, viz., Serratia liquefaciens and Zoballella taiwanensis, in the inoculum used for the fermentation. Consistent with recent studies, we believe that electromethanogenesis will play a significant role in the production of value-added products and improve the management of waste by converting it to energy.

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Section: Biogas Collected In the Presence And Absence Of Kohsupporting

confidence: 93%

Enhancement of Biogas (Methane) Production from Cow Dung Using a Microbial Electrochemical Cell and Molecular Characterization of Isolated Methanogenic Bacteria

Bhatt,

Poudyal,

Dhungana

et al. 2024

Biomass

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“…This eliminates the effect of moisture on the EPF experiment [51], reducing the experimental results' error. As shown in Table 1, CZ exhibits a maximum vitrinite reflectance of 2.92, indicating that the high-rank coal experienced a strong magmatic thermal metamorphism [52][53][54]. In contrast, QY was tested with a maximum vitrinite reflectance of 1.79, reflecting a lower degree of magmatic intrusion than CZ.…”

Section: Sample Preparationmentioning

confidence: 99%

AFM characterization of physical properties in coal adsorbed with different cations induced by electric pulse fracturing

Jia

Liu²,

Cai³

et al. 2022

Fuel

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“…The methanogenic pathway changed from acetoclastic to hydrogenotrophic type. Methanobacterium tolerates environmental changes and can directly accept electrons to reduce CO 2 to CH 4 , which may be an important reason for CO 2 conversion [ 56 ]. The external electric field accelerates microbial metabolism and provides ideas for low-carbon or negative-carbon coal gasification [ 46 ].…”

Section: Improve Environmental Conditions and The Response Of Microbi...mentioning

confidence: 99%

“…The pore connectivity of coal becomes improved. The technology’s feasibility, efficiency, and practicability are further enhanced by applying CO 2 extraction to the biological gasification of coal [ 56 , 61 ]. Especially under supercritical conditions of pieces, the diffusion and solubility of CO 2 in coal become greatly improved.…”

Section: Improve Environmental Conditions and The Response Of Microbi...mentioning

confidence: 99%

Research Progress and Prospects on Microbial Response and Gas Potential in the Coal Gasification Process

et al. 2023

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As an essential unconventional natural gas resource, China’s coalbed methane resources are only commercially exploited in a few areas, such as the Qinshui Basin and the Ordos. The rise of coalbed methane bioengineering makes it possible to realize the conversion and utilization of carbon dioxide through microbial action and the carbon cycle. According to the metabolic behavior of the underground microbial community, if the coal reservoir is modified, it may stimulate the microorganism to continuously produce biomethane to prolong the production life of depleted coalbed methane wells. This paper systematically discusses the microbial response to promoting microbial metabolism by nutrients (microbial stimulation), introducing exogenous microorganisms or domestication of in situ microorganisms (microbial enhancement), pretreating coal to change its physical or chemical properties to improve bioavailability, and improving environmental conditions. However, many problems must be solved before commercialization. The whole coal reservoir is regarded as a giant anaerobic fermentation system. Some issues still need to be solved during the implementation of coalbed methane bioengineering. Firstly, the metabolic mechanism of methanogenic microorganisms should be clarified. Secondly, it is urgent to study the optimization of high-efficiency hydrolysis bacteria and nutrient solutions in coal seams. Finally, the research on the underground microbial community ecosystem and biogeochemical cycle mechanism must be improved. The study provides a unique theory for the sustainable development of unconventional natural gas resources. Furthermore, it provides a scientific basis for realizing the carbon dioxide reuse and carbon element cycle in coalbed methane reservoirs.

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Microbial electrolysis enhanced bioconversion of coal to methane compared with anaerobic digestion: Insights into differences in metabolic pathways

Cited by 46 publications

References 78 publications

Enhancement of Biogas (Methane) Production from Cow Dung Using a Microbial Electrochemical Cell and Molecular Characterization of Isolated Methanogenic Bacteria

Enhancement of Biogas (Methane) Production from Cow Dung Using a Microbial Electrochemical Cell and Molecular Characterization of Isolated Methanogenic Bacteria

AFM characterization of physical properties in coal adsorbed with different cations induced by electric pulse fracturing

Research Progress and Prospects on Microbial Response and Gas Potential in the Coal Gasification Process

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