Anaerobic thermophilic trickle bed reactor as a promising technology for flexible and demand-oriented H2/CO2 biomethanation

Dietmar Strübing, Andreas B. Moeller, Bettina Mößnang, Michael Lebuhn, Jörg E. Drewes, Konrad Koch

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Increasing energy production from variable renewable sources, especially wind and solar photovoltaic, requires measures to maintain a stable electricity grid that balances power production and demand. Flexible conversion of excess renewable energy into a storable substitute natural gas via H2/CO2 biomethanation may be a suitable approach for tackling this challenge. This study investigated the performance of an anaerobic thermophilic trickle bed reactor (ATTBR) during demand-oriented H2/CO2 biomethanation. Different combinations of standby periods (SPs) varying from 1 to 8 days and standby temperatures (25 °C and 55 °C) as well as their repetitive effect on the biological gas conversion performance were systematically evaluated using a standardized restart procedure. The results revealed that the influence of the SP temperature on the restart performance by far outweighed the length of SP investigated. While the investigated ATTBR represents a robust system with a very good restart performance after 25 °C SPs, the repetitive effect of 55 °C SPs was in particular identified as a critical standby setting that causes deterioration of the restart performance. This may be attributed to increased inactivation rates for thermophilic hydrogenotrophic methanogens at 55 °C, which also influences volatile fatty acid transformation dynamics and leads to substantial propionate accumulation (∼3000 mg/L) during 55 °C SPs. For the application of ATTBR in dynamic energy conversion and storage scenarios, further research is required to reduce response times and enhance flexibility.

Original languageEnglish
Pages (from-to)543-554
Number of pages12
JournalApplied Energy
Volume232
DOIs
StatePublished - 15 Dec 2018

Keywords

  • Biological methanation
  • Biomass decay
  • Power-to-Gas
  • Standby strategies
  • Variable renewable energies
  • Volatile fatty acids

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