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Related Concept Videos

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Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...
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Updated: Sep 15, 2025

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
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Comparison of Biodegradation Mechanisms and Structural Evolution Characteristics between Anthracite and Bituminous

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Coal rank significantly impacts microbial-enhanced coalbed methane production. Bituminous coal, with more aliphatic structures and microbial attachment sites, yielded 72.4% more biomethane than anthracite.

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Area of Science:

  • Geochemistry
  • Microbiology
  • Energy Science

Background:

  • Microbial-enhanced coalbed methane (MECM) technology boosts biomethane production.
  • The effect of coal rank on anaerobic degradation for MECM is not well understood.

Purpose of the Study:

  • To evaluate the biomethane potential of anthracite and high-volatile bituminous coal.
  • To elucidate the influence of coal rank on microbial anaerobic degradation.

Main Methods:

  • Comprehensive analyses: gene sequencing, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM).
  • Semiquantitative analysis of molecular structures and surface microstructures.
  • Metabolite analysis of microbial cultures.

Main Results:

  • Anthracite is rich in aromatic hydrocarbons with a smooth surface; bituminous coal has more aliphatic structures and a rougher surface.
  • Microbial degradation primarily targets heteroatomic functional groups and aliphatic structures, with limited efficacy on aromatic structures.
  • Bituminous coal cultures showed a higher abundance of functional bacteria (e.g., Enterobacter, Clostridium, Oscillibacter), leading to increased organic heterocyclic compounds and organic acids.

Conclusions:

  • Coal rank significantly influences MECM by affecting coal structure and microbial activity.
  • Bituminous coal's characteristics favor microbial degradation, resulting in substantially higher methane yields compared to anthracite.
  • Findings offer critical insights for optimizing MECM technology applications.