Characteristics of in-situ hydrogen biomethanation at mesophilic and thermophilic temperatures

Hao Jiang, Fan Wu, Yuchang Wang, Lu Feng, Hongjun Zhou, Yeqing Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

In-situ hydrogen biomethanation is a promising technology to upgrade biogas. The efficiency of biomethanation relies on various parameters, e.g. gas supplement, temperature and hydrogenotrophic methanogens. Therefore, it is important to investigate the characteristics of in-situ hydrogen biomethanation under different conditions. In this study, two experiments (lasted for 91 days and 105 days) were carried out to investigate the impacts of feeding gas and operating conditions on performances of reactors and microorganisms. During the whole experiment, no obvious fluctuation of pH and limitation of gas–liquid mass transfer were found. Results showed that the hydrogenotrophic methanogenesis performed better at thermophilic condition, while the dominant archaea genera at mesophilic and thermophilic temperature was determined to be Methanobacterium and Methanothermobacter, respectively. The highest CH4 content (greater than 90%) was obtained when H2 and CO2 was feeding at ratio of 4:1 and Methanothermobacter was dominant. These findings can provide useful information for promoting hydrogen biomethanation.

Original languageEnglish
Article number125455
JournalBioresource Technology
Volume337
DOIs
Publication statusPublished - Oct 2021

Keywords

  • Anaerobic Digestion
  • Biogas Upgrading
  • Carbon dioxide
  • Hydrogen

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Jiang, H., Wu, F., Wang, Y., Feng, L., Zhou, H., & Li, Y. (2021). Characteristics of in-situ hydrogen biomethanation at mesophilic and thermophilic temperatures. Bioresource Technology, 337, Article 125455. https://doi.org/10.1016/j.biortech.2021.125455