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Enhanced Biogas Production by Ligninolytic Strain Enterobacter hormaechei KA3 for Anaerobic Digestion of Corn Straw

Author

Listed:
  • Qing Zhang

    (Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou 730000, China)

  • Jing Zhang

    (Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou 730000, China)

  • Shuai Zhao

    (Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou 730000, China)

  • Peizhi Song

    (Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou 730000, China)

  • Yanli Chen

    (Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou 730000, China)

  • Pu Liu

    (Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou 730000, China)

  • Chunlan Mao

    (Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou 730000, China)

  • Xiangkai Li

    (Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou 730000, China)

Abstract

Lignin-feeding insect gut is a natural ligninolytic microbial bank for the sustainable conversion of crop straw to biogas. However, limited studies have been done on highly efficient microbes. Here, an efficient ligninolytic strain Enterobacter hormaechei KA3 was isolated from the gut microbiomes of lignin-feeding Hypomeces squamosus Fabricius, and its effects on lignin degradation and anaerobic digestion were investigated. No research has been reported. Results showed that strain KA3 had better lignin-degrading ability for corn straw with a higher lignin-degrading rate (32.05%) and lignin peroxidase activity (585.2 U/L). Furthermore, the highest cumulative biogas yield (59.19 L/kg-VS) and methane yield (14.76 L/kg-VS) were obtained for KA3 inoculation, which increased by 20% and 31%, respectively, compared to CK. Higher removal rates of COD, TS, and vs. of 41.6%, 43.11%, and 66.59% were also found. Moreover, microbial community diversity increased as digestion time prolonged in TG, and bacteria were more diverse than archaea. The dominant genus taxon, for methanogens, was Methanosate in TG, while in CK was Methanosarcina . For bacteria, dominant taxa were similar for all groups, which were Solibacillus and Clostridium . Therefore, strain KA3 improved the methane conversion of the substrate. This study could provide a new microbial resource and practical application base for lignin degradation.

Suggested Citation

  • Qing Zhang & Jing Zhang & Shuai Zhao & Peizhi Song & Yanli Chen & Pu Liu & Chunlan Mao & Xiangkai Li, 2021. "Enhanced Biogas Production by Ligninolytic Strain Enterobacter hormaechei KA3 for Anaerobic Digestion of Corn Straw," Energies, MDPI, vol. 14(11), pages 1-13, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:11:p:2990-:d:559401
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    References listed on IDEAS

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    1. Gabriele Mancini & Stefano Papirio & Piet N. L. Lens & Giovanni Esposito, 2019. "A Preliminary Study of the Effect of Bioavailable Fe and Co on the Anaerobic Digestion of Rice Straw," Energies, MDPI, vol. 12(4), pages 1-11, February.
    2. Aditi David & Tanvi Govil & Abhilash Kumar Tripathi & Julie McGeary & Kylie Farrar & Rajesh Kumar Sani, 2018. "Thermophilic Anaerobic Digestion: Enhanced and Sustainable Methane Production from Co-Digestion of Food and Lignocellulosic Wastes," Energies, MDPI, vol. 11(8), pages 1-13, August.
    3. Fan Zhang, 2019. "In the Dark," World Bank Publications - Books, The World Bank Group, number 30923, December.
    4. Andreas Otto Wagner & Nina Lackner & Mira Mutschlechner & Eva Maria Prem & Rudolf Markt & Paul Illmer, 2018. "Biological Pretreatment Strategies for Second-Generation Lignocellulosic Resources to Enhance Biogas Production," Energies, MDPI, vol. 11(7), pages 1-14, July.
    5. Wenyao Jin & Xiaochen Xu & Fenglin Yang, 2018. "Application of Rumen Microorganisms for Enhancing Biogas Production of Corn Straw and Livestock Manure in a Pilot-Scale Anaerobic Digestion System: Performance and Microbial Community Analysis," Energies, MDPI, vol. 11(4), pages 1-17, April.
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