A microbial route from coal to gas

Welte, Cornelia U.

doi:10.1126/science.aai8101

Cited by 19 publications

(14 citation statements)

References 13 publications

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“…Biogenic gas is an important natural gas resource in coalbed methane (CBM) formations 1, 2 . Microbial enhanced coalbed methane (ME-CBM) recovery is one viable technology for enhancing gas recovery (EGR) 3–13 .…”

Section: Introductionmentioning

confidence: 99%

Changes in pore structure of coal caused by coal-to-gas bioconversion

Zhang

Liu

Bahadur

et al. 2017

Sci Rep

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AbstarctMicrobial enhanced coalbed methane (ME-CBM) recovery is critically examined as a viable technology for natural gas recovery from coalbed methane (CBM) reservoirs. Since the majority of gas-in-place (GIP) is stored as an adsorbed phase in fine pores of coal matrix, the nano-pore structure directly influences gas storage and transport properties. Only limited studies have quantified the alteration of the nano-pore structure due to ME-CBM treatment. This study examines the evolution of the pore structure using a combination of small angle X-ray scattering (SAXS), low-pressure N2 and CO2 adsorption (LPGA) and high-pressure methane adsorption methods. The results show that the surface fractal dimension decreases for the two bioconverted coals compared to the untreated coal. After bio-treatment, the mesopore surface area and pore volume decrease with the average pore diameter increases, while the micropore surface area increases with pore volume decreases. Both inaccessible meso-/micropore size distributions decrease after bioconversion, while the accessible micropore size distribution increases, making a portion of closed micropore network accessible. In addition, the methane adsorption capacities increase after bio-treatment, which is confirmed by the increase of micropore surface area. A conceptual physical model of methanogenesis is proposed based on the evolution of the pore structure.

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Section: Introductionmentioning

confidence: 99%

Changes in pore structure of coal caused by coal-to-gas bioconversion

Zhang

Liu

Bahadur

et al. 2017

Sci Rep

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“…What could be new strategies for cultivating the unculturables from the methane cycle, beside the already mentioned use of genomic information to elucidate growth requirements? To answer this question, it is interesting to look at other approaches and innovations recently applied in the methane cycle, including the discovery of methoxydotrophic methanogenesis in the genus Methermicoccus ( 18 , 19 ). These methanogens degrade methoxylated aromatic compounds (such as those found in coal) to methane by reducing the methoxy moieties to methane and excreting the respective aromatic compounds into the medium.…”

Section: Perspectivementioning

confidence: 99%

Revival of Archaeal Methane Microbiology

Welte

2018

mSystems

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“…1,2 Because of its green and nonpollutive characteristics, MECBM has great theoretical and practical significance for environmental pollution control, the alleviation of energy crises, and the development of new clean energy sources. Therefore, many scholars have proposed the use of microbial-enhanced coalbed methane (MECBM) recovery technology.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, many scholars have proposed the use of microbial-enhanced coalbed methane (MECBM) recovery technology. 1,2 Because of its green and nonpollutive characteristics, MECBM has great theoretical and practical significance for environmental pollution control, the alleviation of energy crises, and the development of new clean energy sources.…”

Section: Introductionmentioning

confidence: 99%

Influence of bioconversion on pore structure of bituminous coal

Chai

Zhou

et al. 2020

Asia-Pacific J Chem Eng

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Microbial-enhanced coalbed methane is a feasible technique to improve gas recovery and achieve antipenetration, and the coal pores determine the gasadsorption capacity and permeability. To study the pore structure of bituminous coal before and after microbial treatment mercury intrusion porosimetry, nitrogen-gas adsorption, scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy was used. The results showed that the microbial treatment increased the macropores volume of the high volatile bituminous coal and sub-bituminous coal, and decreased the micropore and mesopore volume. The porosity increased by 33.80% and 22.89% for the high volatile bituminous coal and sub-bituminous coal, respectively. The effect of bioconversion on the pore structure increases as the degree of coal evolution increases. Because of bioconversion, the oxygen-containing functional groups and the degree of coal crystallization were reduced and the organic matter was degraded, which lead to an enhancement of the pore connectivity. The optimal pH of the nutrient solution for microbial changes to the pore structure was 7. Compared with pure water, the reference of mine water to configure the nutrient solution was more conducive to microbial activity and had a greater impact on the pore structure. K E Y W O R D Scoalbed methane, bituminous coal, pore structure, pH, bio-enhancement

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A microbial route from coal to gas

Abstract: Microbes isolated from an oil reservoir directly convert coal to methane

Cited by 19 publications

References 13 publications

Changes in pore structure of coal caused by coal-to-gas bioconversion

Changes in pore structure of coal caused by coal-to-gas bioconversion

Revival of Archaeal Methane Microbiology

Influence of bioconversion on pore structure of bituminous coal

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