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Mechanism of Electron Acceptor Promoting Propionic Acid Transformation in Anaerobic Fermentation

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  • Hongjing Jing

    (College of Engineering, Northeast Agricultural University, Harbin 150030, China
    Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, China)

  • Wenzhe Li

    (College of Engineering, Northeast Agricultural University, Harbin 150030, China
    Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, China)

  • Ming Wang

    (College of Engineering, Northeast Agricultural University, Harbin 150030, China
    Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, China)

  • Hao Jiao

    (College of Engineering, Northeast Agricultural University, Harbin 150030, China)

  • Yong Sun

    (College of Engineering, Northeast Agricultural University, Harbin 150030, China
    Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, China)

Abstract

To improve the conversion efficiency of propionic acid in the post-anaerobic fermentation of biogas slurry, the anaerobic fermentation process using biogas slurry with a high acid content was simulated in an anaerobic reactor at 35 ± 0.5 °C using sodium propionate as the sole substrate. The effects of different electron acceptors (NO 3 − , SO 4 2− and Fe 3+ ) on propionic acid conversion and the succession of microbial community structures were investigated. The results showed that the experimental group with the electron acceptor NO 3 − exhibited the best anaerobic fermentation effect, with a maximum propionate removal rate of 94%, which was 36% higher than the control group without an electron acceptor. The maximum methane production rate was 307.6 mL/g COD, an increase of 30% compared with the control group. Thauera , Aquabacterium , Desulfomicrobium , Clostridium_sensu_stricto_1 , and other functional microorganisms were all enriched. The dominant functional genes related to redox reactions, such as K03711, K00384, and K03406, were highly enriched in the reactor when Fe 3+ and NO 3 − were added. The study shows that adding an electron acceptor can enhance interactions between microorganisms, achieve efficient propionate conversion, and improve methane production in the system.

Suggested Citation

  • Hongjing Jing & Wenzhe Li & Ming Wang & Hao Jiao & Yong Sun, 2022. "Mechanism of Electron Acceptor Promoting Propionic Acid Transformation in Anaerobic Fermentation," Energies, MDPI, vol. 15(11), pages 1-14, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:11:p:3947-:d:825267
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    References listed on IDEAS

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    4. Bo Zhang & Wenzhe Li & Xiang Xu & Pengfei Li & Nan Li & Hongqiong Zhang & Yong Sun, 2019. "Effect of Aerobic Hydrolysis on Anaerobic Fermentation Characteristics of Various Parts of Corn Stover and the Scum Layer," Energies, MDPI, vol. 12(3), pages 1-15, January.
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