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Coal mining is responsible for 11% of total anthropogenic methane emission thereby contributing considerably to climate change. ... Whether this pathway can provide acetate for methanogenesis in coal wells should be further investigated. ... functioning and nutrient cycling are required to understand and overcome bottlenecks in the ...
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Nov 1, 2020One method for a more environmentally-friendly use of coal is its conversion to methane with the use of microbial communities. Methane production from organic matter (also coalified) usually necessitates the activity of a consortium comprising fermentative Bacteria and methanogenic Archaea.
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100 Ruhr Basin coal in Germany, with methane becoming more 13C-depleted towards the surface zone, independently 101 from coalification patterns. This tendency can be explained either by bacterial methanogenesis, or by secondary 102 processes such as absorption-desorption of methane. Also Scott (2002), in a study about coal seams in the Bowen
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Oct 1, 2021The methane metabolism during anaerobic fermentation of coal and straw is a dominant process of organic matter degradation and biogas production. It is thus important to explore the metabolic characteristics of bacteria and archaea communities during methane production.
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Background: The microbial methanogenesis in the coal microbiome is a resultant of substrate utilization by primarily fermentative bacteria and methanogens. The present work reveals the biodiversity of archaeal sulfate reducers and methanogens present in the underground coal mines of Jharia using metagenomics and pyrosequencing.
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Methane production from a carbonaceous material is stimulated by contacting the material with a methanogenic consortium under anaerobic conditions. Active methanogenic consortia can be isolated and concentrated from anaerobic formation water of a methane-producing carbonaceous formation. Data presented herein demonstrate methane production from carbonaceous material that was essentially non ...
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mass hydrocarbons and kerogen. In coal, most of the methane is generated by the thermal maturation of coal or during the coalification process, where small amounts of H 2S, N 2 and higher hydrocarbons are produced. The amount of these hydrocarbons is indicated by the gas wetness (C 2+) of the coal, i.e. the greater the number of higher
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Since methanogenesis from coal tends to occur in immature coal rather than in mature coal, it was believed that coal-bed microorganisms may produce methane from methoxy groups (Rathi et al., 2015). Unlike coal mining, which required mechanical methods of extraction and processing, biogenic methane production is one of the conventional methods ...
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Request PDF | Water-rock interaction and methanogenesis in formation water in the southeast Huaibei coalfield, China | The hydrogeochemical characteristics of aquifers in coal-bearing strata can ...
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The addition of the rocks raised the pH of the incubation medium causing the transfer of cations from the medium to coal surface to increase leading to an increase in methane production. It was found that the addition of coals to water solutions caused an ion exchange between the water phase and the coal.
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The methanogenesis project aims to determine how microorganisms degrade coal and to demonstrate the feasibility of producing biogenic methane from waste coal in an abandoned mine. Through this project, we will conduct a microbial survey of at least two Bowen Basin coal mines to identify the organisms that thrive where coal is the sole source of ...
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The method of claim 13, wherein said coal is bituminous coal. 15. The method of claim 1, wherein carbon dioxide is added to water, nutrients, chemicals and gases that are introduced into said carbonaceous formation and is converted into methane by methanogenic consortia in the coalseam and then produced from the coalseam.
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in coal bed However, whether the mechanism of thi process is urely hemical eaction by thermal decomposition (thermo-genic methane) or an enzyme-catalyzed biodegradation by microbe (microbia methane) ha been vigorously debated for many years. Recent evidenc supports mi-crobia methanogenesis in coal-bearin ma-
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involved in methanogenesis from coal to better understand how the process can be enhanced and accelerated. Project activities included characterizing the following factors that may lead to enhanced methanogenesis: (1) specific chemical constituents of coal, analyzed by methods such as gas
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could be the better substrate for methanogenesis. Introduction The exploitation and utilization of coalbed methane (CBM) can improve the energy structure worldwide ensuring the sustainable development of energy. It also can greatly reduce the cost of coal mining as methane is the main hazard in the coal mine. Biogenic CBM is an important
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The UK coal mining industry has been producing large volumes of methane gas as an unwanted haz- ard since the 1800's. Methane Emissions in Mines Arise at Two Key Stages: 1. Methane is released as a direct result of the physical process of coal extraction. In many modern underground mines, the coal is extracted through longwall min- ing.
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Here, two 1 m x 10 cm diameter column bioreactors designed to mimic an abandoned coal mine were monitored for a year, with zones of methanogenesis in the bottom, saturated waters and aerobic coal ...
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4 signatures and coal rank and mining setting, and to provide representative 13C signatures to be used in atmo-spheric models in order to produce more accurate methane emission estimates for the coal exploitation sector. Process of coalification and parameters affecting the 13C signature of methane emissions
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This is a natural process that slowly returns this fossil carbon to the atmosphere. Image source: C Bailey, USGS,-shale-and-coal-pennsylvanian-wise-formation Mining and burning coal returns that C to the atmosphere much more quickly than it would otherwise. USGS photo of coal strip mine in Powder River Basin of Wyoming. coal seam
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The aim of this study was to examine the biogas production and the adsorption aspect of microorganism from different coals. Coal samples were obtained from Qianqiu mine and Guandi mine. Microbial populations were cultured from the coal mine drainage. After an anaerobic reaction period at about 35 °C, adsorption rate was determined by the spectrophotometer, while a scanning electron microscopy ...
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Coal mine methane (CH 4) has posed a danger in working coal mines and is a stronger greenhouse gas than CO 2, but is recognised as a valuable source of energy. Coal bed methane (CBM) from unmined coal production in the USA accounts for more than 70% of global CBM production, which exceeds 59 Gm 3. The remainder is produced in descending order of
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Nov 22, 2021CMM refers to the methane released from coal and the surrounding rock strata from mining activities. This methane in mines poses a safety risk due to its explosiveness when mixed with air. Methane is also a greenhouse gas that is more than 25 times more potent than carbon dioxide on a mass basis over a 100-year time period ( learn more about ...
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Methane is the primary constituent of natural gas and is stored within coal as a result of the coalification process whereby plant material is converted to coal. Due to coal mining activities (and subsequent pressure decrease in coal seams), methane is released from the coal and surrounding strata. This leads to the build-up of methane in mines, which potentially creates an explosive hazard.
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The activity of methanogens and related bacteria which inhabit the coal beds is essential for stimulating new biogenic coal bed methane (CBM) production from the coal matrix. In this study, the microbial community structure and methanogenesis were investigated in Southern Qinshui Basin in China, and the composition and stable isotopic ratios of CBM were also determined. Although geochemical ...
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However, compared with underground coal seam environments, little is known about the potential of coal bioconversion to methane from an opencast coal mine by indigenous microbial communities cultured from soils covering and surrounding this mine. In China, more than 400 opencast coal mines are in operation with a coal production of 650,000,000 t/a.
Get priceINTRODUCTION. Coal is abundant in the U.S., is relatively inexpensive, and is an excellent source of energy and byproduct raw materials. Because of these factors, domestic coal is the primary source of fuel for electric power plants in the U.S., and will continue to be well into the 21st century.
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The U.S. Department of Energy's Office of Scientific and Technical Information
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Methane gas is another component of coal, produced not from bacterial means but from methanogenesis. Methane in coal is dangerous, as it can cause coal seam explosions, especially in underground mines, and may cause the coal to spontaneously combust.
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• Waste/ undersize products of coal minesWaste/ undersize products of coal mines, ... the process to enhance natural gas production from coal seams. Following which;the process to enhance natural gas production from coal seams. Following which; ... methanogenesis. Duration CH 4 (scft) CO 2 (scft) Undetected (scft) 30 Days 92.7 65.4 60.9
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It also can greatly reduce the cost of coal mining as methane is the main hazard in the coal mine. ... indicating the effect of some alkaline chemicals on the process of coal liquefaction . Moreover, it was ... of organic compounds from hydrogen peroxide-treated subbituminous coal and their composition changes during microbial methanogenesis ...
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Methane is produced naturally by the process of methanogenesis and is found under the ground and in seabed locations - it is commonly used in chemical industries and also for electricity generation. ... Methane recovered from underground coal mines is generally grouped under the term Coal Mine Methane (CMM). 2 key factors influence CMM ...
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Conventional mining is the oldest method and accounts for only about 12% of underground coal output. In conventional mining, the coal seam is cut, drilled, blasted and then loaded into cars. Continuous mining is the most prevalent form of underground mining, accounting for 56% of total underground production.
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supporting evidence that optimizing the bacterial colonies in the coal can accelerate the natural process of bacterial generation of methane from subsurface coals. ... produce methane as the final product during methanogenesis. The principle growth substrates used by methanogenic bacteria ... Coal Mine sludge 2 1.37 % 1.34 % 1.05 % -0.11 % ...
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Methanogenesis requires more than a simple metabolic cascade of substrates and products between anaerobic bacteria and the methanogens. In fact, in absence of hydrogenotrophic organisms, the fermentation of organic matter is endergonic, with ΔG°′ ranging from +9.6 kJ mol−1 for primary alcohols to +94.9 kJ mol −1 for acetate.
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A large amount of seawater sulfate diffused into the bottom peat and was reduced to H 2 S, S, and polysulfides by microorganisms. 14 In addition, the release of H 2 S due to sulfate reduction would be detrimental to the methanogenesis process during the coal biodegradation. 15 The process of anaerobic fermentation of coals might also be ...
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The release of H 2 S due to sulfate reduction is detrimental to the methanogenesis process during coal biodegradation. The process of anaerobic fermentation of coal seams may also be affected by degraded intermediates and final products (such as sulfides), which at high concentrations affect pH, disrupt cell membranes, prevent protein synthesis ...
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Coal has thus undergone a process of gradual to sudden change. The four jumps correspond to R O of 0.6, 1.3, 2.5, and 3.0%. Regardless of the archaeal or the bacterial community under consideration, the coal rank has a certain influence on the diversity and abundance of the bacteria. ... Fresh coal samples were taken from the coal mine working ...
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TITLE: CHANGES IN PROPERTIES OF COAL AS A RESULT OF CONTINUED BIOCONVERSION. MAJOR PROFESSOR: Dr. Satya Harpalani Microbial actions on coal have long been identified as a source of methane in coalbeds. Andrew Scott (1995) was the first to propose imitating the natural process of biogenic
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1 Key Laboratory of CBM Resource and Reservoir Formation Process, Ministry of Education ... Jiang Z et al 2014 Microbial diversity and biogenic methane potential of a thermogenic-gas coal mine[J] International ... Kirk MF, Wilson BH, Marquart KA et al 2015 Solute concentrations influence microbial methanogenesis in coal-bearing strata ...
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What is claimed is: 1. A process for converting coal ex situ, comprising: (a) treating coal with a liquid that solubilizes at least a portion of the coal to form a product that is a substrate for a hydrolytic microbial population, (b) treating at least a portion of the product of step (a) with the hydrolytic microbial population to produce a product containing fatty acids or fatty acid esters ...
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