Methane production from lignite through the combined effects of exogenous aerobic and anaerobic microflora

Wang, Baoyu; Tai, Chao; Wu, Li; Chen, Linyong; Liu, Jianmin; Hu, Bin; Song, Dangyu

doi:10.1016/j.coal.2017.02.012

Cited by 56 publications

(40 citation statements)

References 44 publications

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“…Based on the fluorescence peaks in the EEM spectra, the common components observed in the intermediates of coal degradation were fulvic-acid-like compounds (region III) and humic-acid-like compounds (region V) ( Figure 3). This indicates that the fulvic-acid-like and humic-acid-like compounds are the main components in the hydrolysis products of coal, as previous studies have reported [15,18].…”

Section: Intermediates Of Coal Degradationsupporting

confidence: 75%

“…It seems that the hydrolysis products of coal, including the fulvic-acid-and the humic-acid-like compounds, were first decomposed into tyrosine-and protein-like compounds, and then into aromatic protein during methane production. compounds are the main components in the hydrolysis products of coal, as previous studies have reported [15,18].…”

Section: Intermediates Of Coal Degradationmentioning

confidence: 87%

“…The methanotrophic species can be grown by the co-oxidation of methane and a wide range of substrates, including aromatics and aliphatics [32,33]. The methane conversion of coal degradation intermediates can be repressed by the accumulation of toxic intermediates [9,15]. In the control, it seems that the reverse methanogenesis that oxidizes methane overwhelmed the methanogenesis as coal degradation intermediates accumulated [9,33].…”

Section: Production Of Methane From Coalmentioning

confidence: 99%

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Contribution of Yeast Extract, Activated Carbon, and an Electrostatic Field to Interspecies Electron Transfer for the Bioelectrochemical Conversion of Coal to Methane

Piao

Song

et al. 2019

Energies

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The bioelectrochemical conversion of coal to methane was investigated in an anaerobic batch reactor containing yeast extract and activated carbon. In anaerobic degradation of coal, yeast extract was a good stimulant for the growth of anaerobic microorganisms, and activated carbon played a positive role. An electrostatic field of 0.67 V/cm significantly improved methane production from coal by promoting direct and mediated interspecies electron transfers between exoelectrogenic bacteria and electrotrophic methanogenic archaea. However, the accumulation of coal degradation intermediates gradually repressed the conversion of coal to methane, and the methane yield of coal was only 31.2 mL/g lignite, indicating that the intermediates were not completely converted to methane. By supplementing yeast extract and seed sludge into the anaerobic reactor, the intermediate residue could be further converted to methane under an electrostatic field of 0.67 V/cm, and the total methane yield of coal increased to 98.0 mL/g lignite. The repression of the intermediates to the conversion of coal to methane was a kind of irreversible substrate inhibition. The irreversible substrate inhibition in the conversion of coal to methane could be attenuated under the electrostatic field of 0.67 V/cm by ensuring sufficient biomass through biostimulation or bioaugmentation.

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Section: Intermediates Of Coal Degradationsupporting

confidence: 75%

Section: Intermediates Of Coal Degradationmentioning

confidence: 87%

Section: Production Of Methane From Coalmentioning

confidence: 99%

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Contribution of Yeast Extract, Activated Carbon, and an Electrostatic Field to Interspecies Electron Transfer for the Bioelectrochemical Conversion of Coal to Methane

Piao

Song

et al. 2019

Energies

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“…Coal-bed methane (CBM) is an important source of natural gas that is formed in subsurface coal seams. The CBM is commonly extracted by wells, but the extraction rate is limited by the formation rate of CBM in the coal seam [1][2][3]. There are two types of CBMs in the coal seam, thermogenic and biogenic, that are converted from the organic matter contained in coal [3].…”

Section: Introductionmentioning

confidence: 99%

“…The bioavailability of coal can be increased to some extent by reducing the coal particle size, increasing the porosity, and adding surfactants [10,11]. Bioaugmentation and biostimulation, in which a microbial consortium or inorganic nutrients, such as nitrogen, phosphorus, trace elements, and vitamins, are supplied to the coal bed, have also been used effectively for promoting coal conversion to methane [2,3,12,13]. However, the methane yield obtainable from 1 g of coal is still only a few tens of µL to a few mL [2,5,11,14].…”

Section: Introductionmentioning

confidence: 99%

Bioelectrochemical Enhancement of Biogenic Methane Conversion of Coal

2018

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This study demonstrated the enhancement of biogenic coal conversion to methane in a bioelectrochemical anaerobic reactor with polarized electrodes. The electrode with 1.0 V polarization increased the methane yield of coal to 52.5 mL/g lignite, which is the highest value reported to the best of our knowledge. The electrode with 2.0 V polarization shortened the adaptation time for methane production from coal, although the methane yield was slightly less than that of the 1.0 V electrode. After the methane production from coal in the bioelectrochemical reactor, the hydrolysis product, soluble organic residue, was still above 3600 mg chemical oxygen demand (COD)/L. The hydrolysis product has a substrate inhibition effect and inhibited further conversion of coal to methane. The dilution of the hydrolysis product mitigates the substrate inhibition to methane production, and a 5.7-fold dilution inhibited the methane conversion rate by 50%. An additional methane yield of 55.3 mL/g lignite was obtained when the hydrolysis product was diluted 10-fold in the anaerobic toxicity test. The biogenic conversion of coal to methane was significantly improved by the polarization of the electrode in the bioelectrochemical anaerobic reactor, and the dilution of the hydrolysis product further improved the methane yield.

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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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Methane production from lignite through the combined effects of exogenous aerobic and anaerobic microflora

Cited by 56 publications

References 44 publications

Contribution of Yeast Extract, Activated Carbon, and an Electrostatic Field to Interspecies Electron Transfer for the Bioelectrochemical Conversion of Coal to Methane

Contribution of Yeast Extract, Activated Carbon, and an Electrostatic Field to Interspecies Electron Transfer for the Bioelectrochemical Conversion of Coal to Methane

Bioelectrochemical Enhancement of Biogenic Methane Conversion of Coal

Available methane from anthracite by combining coal seam microflora andH₂O₂pretreatment

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Methane production from lignite through the combined effects of exogenous aerobic and anaerobic microflora

Cited by 56 publications

References 44 publications

Contribution of Yeast Extract, Activated Carbon, and an Electrostatic Field to Interspecies Electron Transfer for the Bioelectrochemical Conversion of Coal to Methane

Contribution of Yeast Extract, Activated Carbon, and an Electrostatic Field to Interspecies Electron Transfer for the Bioelectrochemical Conversion of Coal to Methane

Bioelectrochemical Enhancement of Biogenic Methane Conversion of Coal

Available methane from anthracite by combining coal seam microflora andH2O2pretreatment

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Product

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Available methane from anthracite by combining coal seam microflora andH₂O₂pretreatment