Evaluating indigenous diversity and its potential for microbial methane generation from thermogenic coal bed methane reservoir

Rathi, Rohit; Lavania, Meeta; Singh, Nimmi; Sarma, Priyangshu M.; Kishore, Puneet; Hajra, Parthanarayan; Lal, Banwari

doi:10.1016/j.fuel.2019.03.125

Cited by 34 publications

(16 citation statements)

References 41 publications

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“…It is more valuable if CO 2 could be transformed to methane underground, which would achieve carbon recycling and reusing. The reduction of CO 2 to methane can be implemented by methanogenic microflora through hydrogenotrophic methanogenesis, which has been detected to be dominant in several coal seams. , However, the microbial community in produced water was found to change significantly during cultivation and the methanogenic pathway varied . Therefore, it is important for the biological transformation of CO 2 in coal seam to keep the hydrogenotrophic methanogenesis stable and sustainable, which could be achieved by inhibiting bacteria and promoting the activities of fungi as suggested by our results.…”

Section: Resultsmentioning

confidence: 61%

“…41,42 However, the microbial community in produced water was found to change significantly during cultivation and the methanogenic pathway varied. 43 Therefore, it is important for the biological transformation of CO 2 in coal seam to keep the hydrogenotrophic methanogenesis stable and sustainable, which could be achieved by inhibiting bacteria and promoting the activities of fungi as suggested by our results.…”

Section: Resultsmentioning

confidence: 68%

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High Potential of Methane Production from Coal by Fungi and Hydrogenotrophic Methanogens from Produced Water

et al. 2020

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Studying in situ microorganisms is essential to understand the formation of biogenic coalbed methane (CBM). Only a few studies have investigated the fungi community inhabiting in coal seams although fungi are found to degrade refractory compounds and solubilize coal and even work with methanogens to produce methane. In this study, produced water was collected from Qinshui Basin and used as the source of microflora to degrade coal. The function of fungi was analyzed by inhibition of bacteria with antibiotics. The results have shown that the inhibition of bacteria in the microcosms significantly increased the methane yield. Fungi were more favorable to cooperate with hydrogenotrophic methanogens when bacteria were inhibited as Methanobacterium were the predominant archaea accounting for 45.98–86.98% of the sequence reads. The relatively unchanged fungal community and high volatile fatty acids (VFAs) yields (48.70–85.72%) in the presence of antibiotics might contribute to H2 production to facilitate hydrogenotrophic methanogenesis. On the contrary, the dominant methanogens in microcosms without antibiotics gradually changed from Methanobacterium (89.85%) to Methanoceta (46.19%) and finally to Methanobacterium (87.72%). The bacterial community and organic intermediates have also changed greatly over time, which can be the reason for the succession of the methanogens. These results suggest that fungi in produced water can play an important role in coal biodegradation to produce VFAs and H2 that support hydrogenotrophic methanogenesis, which could be negatively impacted by the existence of bacteria.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 68%

High Potential of Methane Production from Coal by Fungi and Hydrogenotrophic Methanogens from Produced Water

et al. 2020

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“…This plays an important role in water purification. A greater abundance and higher metabolic activity (U and H indices) of microbial communities influenced the circulation of pollutants in the reservoir and sediments [35,36]. Based on the above results, high microbial metabolic efficiency also played an important role in nutrient removal.…”

Section: Microbial Metabolism Variations During Continuous Mixing Promentioning

confidence: 83%

Water Quality Responses during the Continuous Mixing Process and Informed Management of a Stratified Drinking Water Reservoir

Zhou

Gong

et al. 2019

Sustainability

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Aeration and mixing have been proven as effective in situ water quality improvement methods, particularly for deep drinking water reservoirs. While there is some research on the mechanism of water quality improvement during artificial mixing, the changes to water quality and the microbial community during the subsequent continuous mixing process is little understood. In this study, we investigate the mechanism of water quality improvement during the continuous mixing process in a drinking water reservoir. During this period, we found a reduction in total nitrogen (TN), total phosphorus (TP), ammonium-nitrogen (NH4-N), iron (Fe), manganese (Mn), and total organic carbon (TOC) of 12.5%–30.8%. We also measured reductions of 8.6% and 6.2% in TN and organic carbon (OC), respectively, in surface sediment. Microbial metabolic activity, abundance, and carbon source utilization were also improved. Redundancy analysis indicated that temperature and dissolved oxygen (DO) were key factors affecting changes in the microbial community. With intervention, the water temperature during continuous mixing was 15 °C, and the mixing temperature in the reservoir increased by 5 °C compared with natural mixing. Our research shows that integrating and optimizing the artificial and continuous mixing processes influences energy savings. This research provides a theoretical basis for further advancing treatment optimizations for a drinking water supply.

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“…During the long-term process of coal formation, an unconventional coalbed methane system was formed by the accumulation of hydrocarbons and was stored in the low-permeability coal reservoirs, − and then the subsequent methane recovery was implemented, depending on either the natural crack permeability or the conventional multiborehole extraction, but with low gas production factors. − Some stimulation methods, such as hydraulic fracturing − and anhydrous fracturing, − were recommended to increase the crack volume and improve the poor permeability. For the central and western regions in China, the coal reservoirs enriched abundant methane with lower crack permeability; however, the current situation of water shortage hindered hydraulic fracturing from being widely implemented .…”

Section: Introductionmentioning

confidence: 99%

Brittleness Evolution of Different Rank Coals under the Effects of Cyclic Liquid CO₂ during the Coalbed Methane Recovery Process

Zhai

Sang

et al. 2021

Energy Fuels

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The understanding of brittleness evolution for coals influenced by cyclic liquid CO2 effects has great significance to evaluate the crack capacity of the matrix. A brittleness index (B) calculation model was established on the basis of the statistical damage constitutive equation and the stress–strain curves, without considering their primary curve patterns, that was mainly controlled by elastic modulus (E), compressive strength (σc), and the corresponding strain (εc). Three different rank coals were processed under the temperature effect and the temperature and adsorption coupling effect that originated from cyclic liquid CO2 and then were destroyed by the uniaxial compression test. With the increasing liquid CO2 parameters [cyclic number (CN) and total cyclic time (TCT)], the σc of the different rank coals decreased gradually, while the εc did not have an apparent change tendency that was greatly influenced by the coal anisotropy (the nonuniform deformation responses to the temperature effect and the primary crack complexity) and the capacity of CO2 adsorption decreasing the free surface energy. The B values of lignite and bitumite showed a declining trend, while those of anthracite did not have obvious laws, because of the lack of laws for εc. The relationships between B and CN/TCT indicated that the larger the cyclic parameters, the smaller the B values and the greater the coal destruction degree. The E and σc had positive relationships with the B calculations, while the Poisson’s ratio (μ), damage variable (D v), and accumulated energy (J) did not have obvious correlations with the B values. The introduction of liquid CO2 induced a huge number of unrecoverable deformations and fatigue damages to be generated, leading to a large plastic region and decreasing the coal brittleness. The results might be helpful to evaluate the capacity of liquid CO2 fracturing and to estimate the efficiency of coalbed methane recovery.

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Evaluating indigenous diversity and its potential for microbial methane generation from thermogenic coal bed methane reservoir

Cited by 34 publications

References 41 publications

High Potential of Methane Production from Coal by Fungi and Hydrogenotrophic Methanogens from Produced Water

High Potential of Methane Production from Coal by Fungi and Hydrogenotrophic Methanogens from Produced Water

Water Quality Responses during the Continuous Mixing Process and Informed Management of a Stratified Drinking Water Reservoir

Brittleness Evolution of Different Rank Coals under the Effects of Cyclic Liquid CO₂ during the Coalbed Methane Recovery Process

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Evaluating indigenous diversity and its potential for microbial methane generation from thermogenic coal bed methane reservoir

Cited by 34 publications

References 41 publications

High Potential of Methane Production from Coal by Fungi and Hydrogenotrophic Methanogens from Produced Water

High Potential of Methane Production from Coal by Fungi and Hydrogenotrophic Methanogens from Produced Water

Water Quality Responses during the Continuous Mixing Process and Informed Management of a Stratified Drinking Water Reservoir

Brittleness Evolution of Different Rank Coals under the Effects of Cyclic Liquid CO2 during the Coalbed Methane Recovery Process

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Brittleness Evolution of Different Rank Coals under the Effects of Cyclic Liquid CO₂ during the Coalbed Methane Recovery Process