Recent progress in improving the yield of microbially enhanced coalbed methane production

Wang, Yaya; Bao, Yuan; Hu, Yiliang

doi:10.1016/j.egyr.2023.01.127

Cited by 12 publications

(7 citation statements)

References 69 publications

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“…For example, the SOFC technology development in China commenced relatively late, and the research on the SOFC technology in China has mainly taken the route of independent development, starting from 2007 when China started to research key materials and basic science related to the SOFC. In China, CBM is a very abundant resource associated with coal. − The extraction and utilization of CBM is very important, and a lot of research has been done on the enhancement of CBM production; − however, in the industrial chain of “exploration–extraction–utilization” of CBM, the utilization of low-concentration methane has been a key factor restricting the development of the industry. The SOFC has the unique advantage of being able to utilize CBM directly with high conversion efficiency, and its working principle is shown in Figure b.…”

Section: Introductionmentioning

confidence: 99%

Review and Outlook on the Utilization of Low-Concentration Coalbed Methane for Power Generation by Solid Oxide Fuel Cells

Huang,

Li,

Yin

et al. 2024

Energy Fuels

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With the growing global demand for clean energy, more and more attention has been given to the energy conversion efficiency of low-quality fuels. A solid oxide fuel cell (SOFC) is expected to be one of the ideal technologies for clean and efficient utilization of low-concentration coalbed methane (CBM) because it can achieve efficient utilization of low-quality fuels. This review examines the challenges of SOFC technology fueled by low-concentration CBM. In comparison to fuels such as hydrogen and natural gas, lowconcentration CBM usually contains a large number of other gas components in addition to methane, which reduces the chemical reactivity of CBM and leads to a decrease in the utilization efficiency. The effects of different carbon-containing fuels on the cell performance of SOFC have been investigated by a great deal of research, and the results reveal that methane tends to be the main source of carbon deposition, whereas oxygen-containing fuels can have a positive effect on carbon deposition. In the current SOFC technology fueled by hydrocarbon fuels, concentration polarization is also a major factor contributing to the lack of durability and stability of the cell, with the exception of carbon deposition and sulfur poisoning. In addition, the temperature and other operating environments also have different degrees of influence on the cell performance in the SOFC technology fueled by low-concentration CBM. Therefore, the development of cell materials and the optimization of the system structure of a low-concentration CBM-fueled SOFC are still key research directions for the future.

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Section: Introductionmentioning

confidence: 99%

Review and Outlook on the Utilization of Low-Concentration Coalbed Methane for Power Generation by Solid Oxide Fuel Cells

Huang,

Li,

Yin

et al. 2024

Energy Fuels

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“…CBM is produced either via transformation of organic matter by geochemical processes (thermogenic gas) during the thermal evolution of coal at greater depths or via microbial degradation of coal organic molecules at shallower depths (biogenic gas) (~20% of global biogas resources) ( 1 , 8 – 11 ). Knowledge of the microbial communities related to coalbeds is of great interest for the conversion of coal to methane ( 12 ). Numerous studies have characterized the microbial communities associated with subsurface coalbeds ( 4 , 13 – 16 ) and the surrounding groundwater ( 17 – 22 ) through metagenomic and transcriptomic analysis of key molecular markers such as 16S rRNA or the methyl coenzyme M reductase ( mcrA ) gene, and the GeoChip functional gene array ( 16 , 23 – 35 ).…”

Section: Introductionmentioning

confidence: 99%

Selective trace elements significantly enhanced methane production in coal bed methane systems by stimulating microbial activity

Chin,

Ünal,

Sanderson

et al. 2024

Microbiol Spectr

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Trace elements are associated with the microbial degradation of organic matter and methanogenesis, as enzymes in metabolic pathways often employ trace elements as essential cofactors. However, only a few studies investigated the effects of trace elements on the metabolic activity of microbial communities associated with biogenic coalbed methane production. We aimed to determine the effects of strategically selected trace elements on structure and function of active bacterial and methanogenic communities to stimulate methane production in subsurface coalbeds. Microcosms were established with produced water and coal from coalbed methane wells located in the Powder River Basin, Wyoming, USA. In initial pilot experiments with eight different trace elements, individual amendments of Co, Cu, and Mo lead to significantly higher methane production. Transcript levels of mcrA , the key marker gene for methanogenesis, positively correlated with increased methane production. Phylogenetic analysis of the mcrA cDNA library demonstrated compositional shifts of the active methanogenic community and increase of their diversity, particularly of hydrogenotrophic methanogens. High-throughput sequencing of cDNA obtained from 16S rRNA demonstrated active and abundant bacterial groups in response to trace element amendments. Active Acetobacterium members increased in response to Co, Cu, and Mo additions. The findings of this study yield new insights into the importance of essential trace elements on the metabolic activity of microbial communities involved in subsurface coalbed methane and provide a better understanding of how microbial community composition is shaped by trace elements. IMPORTANCE Microbial life in the deep subsurface of coal beds is limited by nutrient replenishment. While coal bed microbial communities are surrounded by carbon sources, we hypothesized that other nutrients such as trace elements needed as cofactors for enzymes are missing. Amendment of selected trace elements resulted in compositional shifts of the active methanogenic and bacterial communities and correlated with higher transcript levels of mcrA . The findings of this study yield new insights to not only identify possible limitations of microbes by replenishment of trace elements within their specific hydrological placement but also into the importance of essential trace elements for the metabolic activity of microbial communities involved in subsurface coalbed methane production and provides a better understanding of how microbial community composition is shaped by trace elements. Furthermore, this finding might help to revive already spent coal bed methane well systems with the ultimate goal to stimulate methane production.

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“…Affected by the shortage of fossil energy and the greenhouse effect, all countries in the world are actively exploring new energy. , Coalbed methane is a new type of clean energy with broad application prospects, which has attracted the attention of governments all over the world. , According to the data of the International Energy Agency (IEA), the total global coalbed methane resources buried at a depth of less than 2000 m can reach 260 trillion m 3 , which is more than twice the proven reserves of conventional natural gas . However, the coal seams are less permeable and need to be hydraulically fractured to increase the permeability before the drainage of coalbed methane, especially in China. , Fracturing fluid is a key factor affecting the hydraulic fracture morphology and coal microstructure and plays an important role in the process of hydraulic fracturing. − …”

Section: Introductionmentioning

confidence: 99%

“… 6 , 7 Fracturing fluid is a key factor affecting the hydraulic fracture morphology and coal microstructure and plays an important role in the process of hydraulic fracturing. 8 − 10 …”

Section: Introductionmentioning

confidence: 99%

Evolution Characteristics of the Microstructure with Different Fracturing Fluids: An Experimental Study of Guizhou Bituminous Coal

Li,

Sun,

et al. 2023

ACS Omega

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Fracturing fluid is a key factor affecting the hydraulic fracture morphology and coal microstructure, which plays a key role in the hydraulic fracturing effect. To compare the effect of clean water, clean fracturing fluid, and acid fracturing fluid on the pore structure of coal, this paper used high-pressure mercury injection (MIP), low-temperature N2 adsorption (LT-N2A), and scanning electron microscopy (SEM) to determine the pore structure of Guizhou bituminous coal before and after the action of fracturing fluid. The results show that clean water can cause mineral expansion and reduce pore volume by about 6% and clean fracturing fluid and acid fracturing fluid can increase pore volume by 3 and 12%, respectively, due to different degrees of acidity. The MIP data show that the pore structure of coal samples is more complex after the action of different fracturing fluids, and acidic fracturing fluids can increase the fractal dimension of the pore by about 7%. The LT-N2A data showed that the fractal dimension of micropores and transition pores decreased after the action of different fracturing fluids. In general, acid fracturing fluid has the best effect on the coal microstructure, followed by clean fracturing fluid, and the least effect on clean water.

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Recent progress in improving the yield of microbially enhanced coalbed methane production

Cited by 12 publications

References 69 publications

Review and Outlook on the Utilization of Low-Concentration Coalbed Methane for Power Generation by Solid Oxide Fuel Cells

Review and Outlook on the Utilization of Low-Concentration Coalbed Methane for Power Generation by Solid Oxide Fuel Cells

Selective trace elements significantly enhanced methane production in coal bed methane systems by stimulating microbial activity

Evolution Characteristics of the Microstructure with Different Fracturing Fluids: An Experimental Study of Guizhou Bituminous Coal

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