scholarly journals Enhancement of biogenic methane production by co-degradation of coal and straw: microbial and organic analysis

2020 ◽  
Author(s):  
Hongguang Guo ◽  
Yatong Cheng ◽  
Kaixin Duan ◽  
Weiguo Liang ◽  
Zaixing Huang ◽  
...  
Keyword(s):  
Methane Production ◽  
Organic Analysis ◽  
Biogenic Methane

scholarly journals Bioelectrochemical Enhancement of Biogenic Methane Conversion of Coal

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2577 ◽  
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.

Methanotrophs and Methanogens in Masonry

1998 ◽  
Vol 64 (11) ◽  
pp. 4530-4532 ◽  
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.

scholarly journals Optimization of biogenic methane production from coal

2017 ◽  
Vol 183 ◽  
pp. 14-24 ◽  
Author(s):  
John Fuertez ◽  
Van Nguyen ◽  
John D. McLennan ◽  
D. Jack Adams ◽  
Kyu-Bum Han ◽  
...  
Keyword(s):  
Methane Production ◽  
Biogenic Methane

scholarly journals Comparative metagenomics of coalbed methane microbial communities reveals biogenic methane potential in the Appalachian Basin

2018 ◽  
Author(s):  
Daniel E. Ross ◽  
Daniel Lipus ◽  
Kelvin B. Gregory ◽  
Djuna Gulliver
Keyword(s):  
Microbial Communities ◽  
Methane Production ◽  
Coalbed Methane ◽  
Large Fraction ◽  
Appalachian Basin ◽  
Well Performance ◽  
Biogenic Methane ◽  
Comparative Metagenomics ◽  
Functionally Diverse ◽  
High Degree

Natural gas is a major source of global energy, and a large fraction is generated in subsurface coalbed deposits. Microbial communities within coalbed deposits impact methane production, and as a result contribute to global carbon cycling. The process of biogenic coal-to-methane conversion is not well understood. Here we demonstrate the first read- and assembly-based metagenome profiling of coal-associated formation waters, resulting in the recovery of over 40 metagenome-assembled genomes (MAGs) from eight individual coalbed methane wells in the Appalachian Basin. The majority of samples contained hydrogenotrophic methanogens, which were present in higher relative abundances than was previously reported for other coalbed basins. The abundance of Archaea and salinity were positively correlated, suggesting that salinity may be a controlling factor for biogenic coalbed methane. Low-abundance coalbed microbial populations were functionally diverse, while the most dominant organisms exhibit a high degree of genomic and functional similarities. Basin-specific pan-metagenome clustering suggests lower abundant and diverse bacterial communities are shaped by local basin parameters. Our analyses show Appalachian Basin coalbed microbial communities encode for the potential to convert coal into methane, which may be used as an indicator of potential biogenic methane production for future well performance and increased well longevity.

scholarly journals Investigation on the utilization of coal washery rejects by different microbial sources for biogenic methane production

Chemosphere ◽  
2021 ◽  
pp. 132165
Author(s):  
Vinitha Ponnudurai ◽  
Ravikumar Rajarathinam ◽  
KirupaSankar Muthuvelu ◽  
Sivasubramanian Velmurugan ◽  
Radha Krishna Nalajala ◽  
...  
Keyword(s):  
Methane Production ◽  
Biogenic Methane ◽  
Coal Washery ◽  
Microbial Sources
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