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Effect of different inorganic iron compounds on the biological methanation of CO2 sequestered in coal seams

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  • Xia, Daping
  • Huang, Song
  • Gao, Zhixiang
  • Su, Xianbo

Abstract

To study the effect of different inorganic iron compounds on the biological methanation of CO2 sequestered in coal seams, a biogas production experiment was carried out through use of bituminous coal D (China) and indigenous microorganisms, by adding bicarbonate and inorganic iron compounds. It is found that the addition of FeCl2 or FeS2 promoted methane production. FeS2 resulted in the highest methane concentration (30.54%) and methane production (0.191 mmol/g), which increased by 30.46% and 38.11%, respectively. The pH of the experimental group was lower than that of the control group during the whole process. The chemical oxygen demand (COD) first increased and then decreased, and the COD peak value greatest increased by 3.07% after FeCl2 was added. The ammonia nitrogen content in the liquid phase with FeCl2 or FeS2 was improved obviously (11.01% and 6.76%), and the microorganisms were increased accordingly. Scanning electron microscopy and energy dispersive spectrometry (SEM-EDS) showed that the microorganisms reacted with coal and iron after addition of Fe to generate several amorphous substances on the surface of coal, and further enhanced biomethane production. This study provides a new method for the utilization of CO2 sequestered in coal seams and the rational development of high sulfur coal.

Suggested Citation

  • Xia, Daping & Huang, Song & Gao, Zhixiang & Su, Xianbo, 2021. "Effect of different inorganic iron compounds on the biological methanation of CO2 sequestered in coal seams," Renewable Energy, Elsevier, vol. 164(C), pages 948-955.
    • Handle: RePEc:eee:renene:v:164:y:2021:i:c:p:948-955
    DOI: 10.1016/j.renene.2020.09.048
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    References listed on IDEAS

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    1. Hang T. Dinh & Jan Kuever & Marc Mußmann & Achim W. Hassel & Martin Stratmann & Friedrich Widdel, 2004. "Iron corrosion by novel anaerobic microorganisms," Nature, Nature, vol. 427(6977), pages 829-832, February.
    2. Ma, Lei & Zhou, Lei & Ruan, Meng-Ya & Gu, Ji-Dong & Mu, Bo-Zhong, 2019. "Simultaneous methanogenesis and acetogenesis from the greenhouse carbon dioxide by an enrichment culture supplemented with zero-valent iron," Renewable Energy, Elsevier, vol. 132(C), pages 861-870.
    3. Ma, Lei & Zhou, Lei & Mbadinga, Serge Maurice & Gu, Ji-Dong & Mu, Bo-Zhong, 2018. "Accelerated CO2 reduction to methane for energy by zero valent iron in oil reservoir production waters," Energy, Elsevier, vol. 147(C), pages 663-671.
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    Cited by:

    1. Niu, Yu & Suo, Yonglu & Niu, Xian, 2023. "Insights into the response mechanism of Fusarium sp. NF01 during lignite biodegradation using proteomic analysis," Energy, Elsevier, vol. 278(PB).

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