Mechanism of Electron Acceptor Promoting Propionic Acid Transformation in Anaerobic Fermentation

Hongjing Jing, Wenzhe Li, Ming Wang, Hao Jiao and Yong Sun
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Hongjing Jing: College of Engineering, Northeast Agricultural University, Harbin 150030, China
Wenzhe Li: College of Engineering, Northeast Agricultural University, Harbin 150030, China
Ming Wang: College of Engineering, Northeast Agricultural University, 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

Energies, 2022, vol. 15, issue 11, 1-14

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.

Keywords: propionic acid conversion; electron acceptor; anaerobic fermentation; microbial flora; function gene (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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