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Comparative study on packing materials for improved biological methanation in trickle Bed reactors.

Alexandros Chatzis1, Esteban Orellana2, Maria Gaspari3

  • 1Laboratory of Chemical and Environmental Technology, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Soil and Water Resources Institute, Hellenic Agricultural Organisation Dimitra, Thermi-Thessaloniki 57001, Greece.

Bioresource Technology
|July 5, 2023
PubMed
Summary

Activated carbon packing significantly boosts biological methanation efficiency in trickle bed reactors. This method enhances methane purity and reduces gas retention time, optimizing biogas production.

Keywords:
Activated carbonBioprocess optimizationHydrogenotrophic methanogenesisMicrobial communityRaschig rings

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Area of Science:

  • Energy Production
  • Biotechnology
  • Bioreactor Engineering

Background:

  • Biological methanation is crucial for biogas production.
  • Trickle Bed Reactors (TBRs) are utilized for methanation processes.
  • Packing materials can influence reactor performance and microbial community dynamics.

Purpose of the Study:

  • To evaluate commercial pelletized activated carbon and Raschig rings as packing materials in TBRs for biological methanation.
  • To assess the impact of packing materials on process indicators and microbial community composition.
  • To optimize methanation efficiency through material selection.

Main Methods:

  • Comparative analysis of activated carbon and Raschig rings in TBRs.
  • Monitoring of process indicators: methane purity, pH, and gas retention time.
  • Examination of microbial community composition and functional genes.

Main Results:

  • Activated carbon led to a two-fold increase in methane purity compared to Raschig rings.
  • Stable pH (7-8) and reduced gas retention time (90 min vs. 6 h) were observed with activated carbon.
  • Specific fermentative species (e.g., Amaricoccus sp., Caloramator australicus) were identified, potentially explaining acid production.

Conclusions:

  • Pelletized activated carbon is a superior packing material for enhancing biological methanation efficiency in TBRs.
  • The physical properties of packing materials significantly impact reactor performance and methane yield.
  • Digestate from biogas plants provides sufficient nutrients, and microbial community analysis offers insights into methanation pathways.