Experimental investigation on the feasibility of industrial methane production in the subsurface environment via microbial activities in northern Hokkaido, Japan – A process involving subsurface cultivation and gasification

Aramaki, Noritaka; Tamamura, Shuji; Ueno, Akira; Badrul, Alam A.K.M.; Murakami, Takahiro; Tamazawa, Satoshi; Yamaguchi, Satoru; Aoyama, Hideo; Kaneko, Katsuhiko

doi:10.1016/j.enconman.2017.10.017

Cited by 22 publications

(11 citation statements)

References 32 publications

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“…5,22,23 The low-molecular-weight organic acids produced after H 2 O 2 pretreatment are available to methanogens to produce biomethane at lignite seams. 24 Similar phenomenon was also found in subbituminous coal that the content of carboxylic acids and other soluble components for biomethane production were increased after pretreated with 3% H 2 O 2 for 207 days. 25 Even for anthracite, the aromaticity and crystalline carbon content was improved by treating with 30% H 2 O 2 for 24 hours.…”

supporting

confidence: 69%

“…27 And a concept of in situ biogenic methane production by H 2 O 2 pretreatment has been proposed by Aramaki et al that the increment of biogenic methane production could be achieved by injecting fresh microflora after H 2 O 2 pretreatment. 24 However, the previous studies mainly focused on the biomethane production from liquid product of H 2 O 2 pretreatment. The potential of residual coal to produce biomethane after H 2 O 2 pretreatment was unclear.…”

Section: Dynamic Changes In Coal Crystal Structure During H 2 O 2 Pretreatment Followed By Anaerobic Biodegradationmentioning

confidence: 99%

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Available methane from anthracite by combining coal seam microflora andH₂O₂pretreatment

et al. 2020

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Summary The conversion of coal to methane by anaerobic microorganisms is an efficient, clean, and green way to utilize coal. However, methane production is relatively low due to the low bioavailability of coal. H2O2 has been demonstrated to increase methane production by transferring coal to liquid organics. Little is known about the bioavailability of residual coal after H2O2 pretreatment. Here, H2O2 was employed to pretreat anthracite, and the potential of residual coal to produce methane was analyzed. The optimum conditions for pretreatment were 30% H2O2 for 12 hours when the methane production reached 254.97 μmol/g coal, increased by 24.98% compared with that in unpretreated coal. The results of FTIR showed that the substitutions of aromatics, alkanes rings, aliphatics, and even C=C structure in coal were depolymerized and oxygen‐containing functional groups were generated after pretreatment with H2O2. The oxygen‐containing functional groups were further degraded by anaerobic microflora. The XRD results showed that the crystal structure of coal decreased after pretreatment with H2O2 following 27 days of cultivation. These results suggested that H2O2 pretreatment mainly altered coal by increasing the oxygen‐containing functional groups and decreasing the crystal structure of coal to facilitate coal biodegradation and enhance biomethane production. The effect of H2O2 on the production of biomethane was not only to produce easily degradable organics, but also to change the coal structure and promote the degradation of residual coal. Therefore, the enhancement of biomethane production by H2O2 pretreatment on surface bioconversion and underground coalbed methane mining should take the increase methane yield from residual coal into account.

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supporting

confidence: 69%

Section: Dynamic Changes In Coal Crystal Structure During H 2 O 2 Pretreatment Followed By Anaerobic Biodegradationmentioning

confidence: 99%

Available methane from anthracite by combining coal seam microflora andH₂O₂pretreatment

et al. 2020

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“…The pretreatment methods of coal (nitric acid or hydrogen peroxide oxidation, fungal depolymerization, etc.) also affect the biogas production to different extents . After biomethane metabolism, the micromorphology and pore structure of the coal sample surface changed, and the number, length, and width of cracks increased significantly .…”

Section: Introductionmentioning

confidence: 99%

“…also affect the biogas production to different extents. 24,25 After biomethane metabolism, the micromorphology and pore structure of the coal sample surface changed, and the number, length, and width of cracks increased significantly. 26,27 In addition, the coal mass exhibited an effective increase in permeability.…”

Section: Introductionmentioning

confidence: 99%

Controlling mechanism of coal chemical structure on biological gas production characteristics

et al. 2020

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Summary To find the effect of coal chemical structure on biogas production, Lignite B was collected and extracted with nitrogen methylpyrrolidone (NMP), acetone and 0.60 mol/L NaOH. Simultaneously, methanogenic bacteria were enriched, and gas production experiments involving solvent extraction from residual coal and secondary gas production experiments involving coal were performed. The characteristics of biogas production, microcrystalline structure and coal chemical structure were analyzed. The results showed that the biogas production capacity of residual coal extracted by different solvents differed. The biogas production capacity of residual coal extracted by 0.60 mol/L NaOH was severely inhibited. The biogas production capacity of residual coal extracted by NMP and acetone was enhanced compared with that of raw coal. In contrast, primary residual coal still exhibits potential for methane production, but the methane production efficiency was reduced. Changes in the microcrystalline structure and functional groups of residual coal showed that solvent extraction increases the spacing and stacking height of the aromatic lamellae of coal, reduces the hydroxyl, methyl, methylene and aromatic hydrocarbon levels in coal, loosens the macromolecular network structure of coal, and enhances the connectivity of pores and fissures, thus allowing methane‐producing bacteria to enter the coal mass and create favorable conditions for gas production through interactions between the two. X‐ray photoelectron spectroscopy measurements showed that the secondary gas production increased the C content on the coal surface, decreased the O content and the O/C ratio, thus promoting the consumption of oxygen‐containing functional groups on the coal surface to further produce gas.

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“…Moreover, oil reservoirs are also defined as natural bioreactors, and indigenous microbial communities such as methanogens provide the potential possibility to transform injected CO 2 into methane as clean energy, for energy recovery and the reduction of carbon dioxide [5,6]. From the above-mentioned perspective, the injected CO 2 can also be regarded as the potential carbon source for clean energy methane production by hydrogenotrophic methanogens, as predominant members inhabiting petroleum reservoirs, commonly with hydrogen and carbon dioxide as substrates, in order to achieve the in situ energy recovery from CO 2 utilization and to promote deployment of CCS [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Bioconversion Pathway of CO2 in the Presence of Ethanol by Methanogenic Enrichments from Production Water of a High-Temperature Petroleum Reservoir

et al. 2019

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Transformation of CO2 in both carbon capture and storage (CCS) to biogenic methane in petroleum reservoirs is an attractive and promising strategy for not only mitigating the greenhouse impact but also facilitating energy recovery in order to meet societal needs for energy. Available sources of petroleum in the reservoirs reduction play an essential role in the biotransformation of CO2 stored in petroleum reservoirs into clean energy methane. Here, the feasibility and potential on the reduction of CO2 injected into methane as bioenergy by indigenous microorganisms residing in oilfields in the presence of the fermentative metabolite ethanol were assessed in high-temperature petroleum reservoir production water. The bio-methane production from CO2 was achieved in enrichment with ethanol as the hydrogen source by syntrophic cooperation between the fermentative bacterium Synergistetes and CO2-reducing Methanothermobacter via interspecies hydrogen transfer based upon analyses of molecular microbiology and stable carbon isotope labeling. The thermodynamic analysis shows that CO2-reducing methanogenesis and the methanogenic metabolism of ethanol are mutually beneficial at a low concentration of injected CO2 but inhibited by the high partial pressure of CO2. Our results offer a potentially valuable opportunity for clean bioenergy recovery from CCS in oilfields.

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Experimental investigation on the feasibility of industrial methane production in the subsurface environment via microbial activities in northern Hokkaido, Japan – A process involving subsurface cultivation and gasification

Cited by 22 publications

References 32 publications

Available methane from anthracite by combining coal seam microflora andH₂O₂pretreatment

Available methane from anthracite by combining coal seam microflora andH₂O₂pretreatment

Controlling mechanism of coal chemical structure on biological gas production characteristics

Bioconversion Pathway of CO2 in the Presence of Ethanol by Methanogenic Enrichments from Production Water of a High-Temperature Petroleum Reservoir

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Experimental investigation on the feasibility of industrial methane production in the subsurface environment via microbial activities in northern Hokkaido, Japan – A process involving subsurface cultivation and gasification

Cited by 22 publications

References 32 publications

Available methane from anthracite by combining coal seam microflora andH2O2pretreatment

Available methane from anthracite by combining coal seam microflora andH2O2pretreatment

Controlling mechanism of coal chemical structure on biological gas production characteristics

Bioconversion Pathway of CO2 in the Presence of Ethanol by Methanogenic Enrichments from Production Water of a High-Temperature Petroleum Reservoir

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Available methane from anthracite by combining coal seam microflora andH₂O₂pretreatment

Available methane from anthracite by combining coal seam microflora andH₂O₂pretreatment