Biogenic Methane Production from Various Coal Rank and Its Controlling Factors Using Ruminant Waste as a Microorganism-Consortium Source

We have performed 2D and 3D gas hydrate (GH) petroleum systems modeling for the Pleistocene turbiditic sedimentary sequences distributed in the Daini-Atsumi area in the eastern Nankai Trough to understand the accumulation mechanisms and their spatial distribution related to geologic and geochemical processes. High-resolution seismic facies analysis and interpretations were used to define facies distributions in the models. We have created a new biogenic methane generation model based on the biomarker analysis using core samples and incorporated it into our model. Our 2D models were built and simulated to confirm the parameters to be used for 3D modeling. Global sea level changes and paleogeometry estimated from 3D structural restoration results were taken into account to determine the paleowater depth of the deposited sedimentary sequences. Pressure and temperature distributions were modeled because they are the basic factors that control the GH stability zone. Our 2D modeling results suggested that the setting of biogenic methane generation depth is one of the most important controlling factors for GH accumulation in the Nankai Trough, which may be related to the timing of methane upward migration (expulsion) and methane solution process in pore water. Our 3D modeling results suggested that the distribution of sandy sediments and the formation dip direction are important controlling factors in the accumulation of GHs. We also found that the simulated amount of GH accumulation from the petroleum systems modeling compares well with independent estimations using 3D seismic and well data. This suggests that the model constructed in this study is valid for this GH system evaluation and that this type of evaluation can be useful as a supplemental approach to resource assessment.

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Advancements in Understanding and Enhancing Biogenic Methane Production From Coals

10.2118/149200-ms ◽

2011 ◽

Cited By ~ 1

Author(s):

Karen Budwill ◽

Susan Koziel ◽

John Vidmar

Keyword(s):

Methane Production ◽

Biogenic Methane

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Bioelectrochemical Enhancement of Biogenic Methane Conversion of Coal

Energies ◽

10.3390/en11102577 ◽

2018 ◽

Vol 11 (10) ◽

pp. 2577 ◽

Cited By ~ 4

Author(s):

Dong-Mei Piao ◽

Young-Chae Song ◽

Dong-Hoon Kim

Keyword(s):

Methane Production ◽

Methane Conversion ◽

Substrate Inhibition ◽

Hydrolysis Product ◽

Oxygen Demand ◽

Methane Yield ◽

Anaerobic Reactor ◽

Adaptation Time ◽

Biogenic Methane ◽

Inhibition Effect

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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Methanotrophs and Methanogens in Masonry

Applied and Environmental Microbiology ◽

10.1128/aem.64.11.4530-4532.1998 ◽

1998 ◽

Vol 64 (11) ◽

pp. 4530-4532 ◽

Cited By ~ 12

Author(s):

Martin Kussmaul ◽

Markus Wilimzig ◽

Eberhard Bock

Keyword(s):

Methane Production ◽

Methanogenic Archaea ◽

Cell Number ◽

Type Ii ◽

Historical Buildings ◽

Average Cell ◽

Biogenic Methane ◽

Methane Oxidizing Bacteria ◽

Low Concentrations ◽

Growth Substrates

ABSTRACT Methanotrophs were present in 48 of 225 stone samples which were removed from 19 historical buildings in Germany and Italy. The average cell number of methanotrophs was 20 CFU per g of stone, and their activities ranged between 11 and 42 pmol of CH4 g of stone−1 day−1. Twelve strains of methane-oxidizing bacteria were isolated. They belonged to the type II methanotrophs of the genera Methylocystis,Methylosinus, and Methylobacterium. In masonry, growth substrates like methane or methanol are available in very low concentrations. To determine if methane could be produced by the stone at rates sufficient to support growth of methanotrophs, methane production by stone samples under nonoxic conditions was examined. Methane production of 0.07 to 215 nmol of CH4 g of stone−1 day−1 was detected in 23 of 47 stone samples examined. This indicated the presence of the so-called “mini-methane”-producing bacteria and/or methanogenic archaea. Methanotrophs occurred in nearly all samples which showed methane production. This finding indicated that methanotrophs depend on biogenic methane production in or on stone surfaces of historical buildings.

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