Stimulation of biogenic methane generation from lignite through supplying an external substrate

Yoon, Seok-Pyo; Jeon, Ji-Young; Lim, Haksang

doi:10.1016/j.coal.2016.05.009

Cited by 39 publications

(19 citation statements)

References 17 publications

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“…Yoon et al first reported the feasibility of enhancing biogenic CBM by co-degradation and found that the mass ratio of rice to lignite needed to be more than 33.3% to increase methane production. 8 The significant increment of biomethane production was also observed in the co-degradation of maize straw with lignite and two bituminous coals that the maximum methane production increased by 448.98% compared with coal degradation. 9 The type, component, and particle size of straw and coal particle size were found to affect the methane production in co-degradation of anthracite and straw, and straw would stimulate coal degradation.…”

Section: Introductionmentioning

confidence: 89%

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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Section: Introductionmentioning

confidence: 89%

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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“… 10 , 11 The co-conversion of coal with straw can increase methane production several times compared to the bioconversion of single coal or straw. 12 , 13 …”

Section: Introductionmentioning

confidence: 99%

Biochemical Process and Microbial Evolution in the Conversion of Corn Straw Combined with Coal to Biogas

Zhang

Wang²,

Guo

et al. 2022

ACS Omega

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The combined anaerobic fermentation of coal and straw can increase the production of biogas. To explore the mechanism of adding corn straw to increase methane production, coal with different metamorphic degrees and corn straw were collected for biogas production simulation experiments under different substrate ratios. The changes in liquid products, the structure of lignocellulose in corn straw, and microbial evolution were monitored. The results showed that the combined fermentation of bituminous coal A with corn straw and bituminous coal C with corn straw at a mass ratio of 2:1 each ((AC-2) and (CC-2)) and that of bituminous coal B and corn straw at a mass ratio of 3:1 (BC-3) had the best gas production, and methane yields reached 17.28, 12.51, and 14.88 mL/g, respectively. The fermentation liquid had organic matter with more types and higher contents during the early and peak stages of gas production, and fewer types of organic matter were detected in the terminal stage. The degradation of lignocelluloses in the corn straw of AC-2 was higher. With the increase in fermentation time, the carbohydrates in the fermentation system increased and the degradation rate of cellulose decreased gradually. The abundance of genes related to nitrate reduction gradually increased, while that of sulfate reduction was on the contrary. Bacteria in the cofermentation system mainly metabolized carbohydrates. During cofermentation with high metamorphic coal, corn straw would be preferentially degraded. The structure of the archaea community changed from Methanosarcina and Methanothrix to Methanobacterium .

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“…In recent years, as a new kind of unconventional natural gas, biogenic coalbed gas has been found in many coal-bearing basins all over the world (Warwick et al, 2008;Strąpoć et al, 2011;Yun et al, 2012 ;Yoon et al, 2016). Microorganisms can degrade coal organic matter and convert it into coalbed gas through their own metabolic activities when coal reservoirs have a suitable external environment (Green et al, 2008;Jones et al, 2010;Penner et al, 2010;Beckmann et al, 2011;Haider et al, 2013;Wang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Simulation of biogenic coalbed gas from anthracite in the south of Qinshui Basin, China

Wang

Shao

et al. 2022

Arab J Geosci

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High rank coal, such as anthracite, has been considered difficult to generate biogas because of the high coalification degree. Selecting anthracite from Sihe coal mine, Qinshui basin, China, as substrate, this study carried out a simulation experiment of biogas generation for 80 days, the purpose of which was to verify whether anthracite could be bio-degraded to produce biogas under laboratory conditions. The results showed that the selected anthracite can be utilized by methanogenic bacteria to produce biogas and the approximate production field was 1.79mL/g, which was less than that of lower rank coal of other published studies. The generation process can be divided into a rapid growth stage (0-30d) and a slow descent stage (30-80d). CO 2 and CH 4 are the main components of biogas, although some heavy-hydrocarbons were also tested. The CO 2 concentrations were low (<30%) and the δ 13 C -CH4 values were positive (-39.9‰ to -45.8‰), which suggested that the main biogas generation pathway was acetic fermentation. But at the same time, the concentrations of CH 4 and CO 2 were mutually increasing and decreasing with the passage of experiment time, and δ 13 C -CH4 tends to be lighten in the later stage(40-80d), suggesting that parts of biogenic CH 4 was generated by way of CO 2 -reduction.

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Stimulation of biogenic methane generation from lignite through supplying an external substrate

Cited by 39 publications

References 17 publications

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

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

Biochemical Process and Microbial Evolution in the Conversion of Corn Straw Combined with Coal to Biogas

Simulation of biogenic coalbed gas from anthracite in the south of Qinshui Basin, China

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