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Improved methane production from brown algae under high salinity by fed-batch acclimation.

Toyokazu Miura1, Akihisa Kita1, Yoshiko Okamura1

  • 1Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan; CREST, JST, Japan.

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Marine microbes enhanced methane production from seaweed, even in high salinity conditions. This microbial community showed improved acetoclastic methanogenesis for efficient energy recovery.

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Brown algaeFed-batch cultivationMethaneMicrobial communitySalinity

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Area of Science:

  • Microbiology
  • Biotechnology
  • Environmental Science

Background:

  • Marine sediments harbor diverse microbial communities with potential for bioprocessing.
  • Brown algae represent a sustainable feedstock for biogas production.
  • High salinity environments pose challenges for microbial methanogenesis.

Purpose of the Study:

  • To develop a methanogenic microbial community from marine sediments for enhanced methane production from brown algae.
  • To investigate the effect of high salinity on methane productivity and microbial community structure.
  • To elucidate the mechanism behind improved methane generation.

Main Methods:

  • Fed-batch cultivation of marine sediment-derived microbes using brown algae as feedstock.
  • Gradual increase in seaweed addition (1wt% total solid) and monitoring of salinity levels.
  • Analysis of methane production rate, salinity accumulation, and microbial community composition (bacteria and archaea).

Main Results:

  • Methane production rate increased 8-fold by the 10th cultivation round.
  • Salinity increased 1.6-fold, reaching 5% NaCl equivalent by the 10th round.
  • Acetate was rapidly converted to methane, indicating enhanced acetoclastic methanogenesis.
  • The bacterial family Fusobacteriaceae and archaeal genus Methanosaeta predominated.

Conclusions:

  • Marine microbial communities can be adapted for high-salinity, high-methane-yield bioprocessing of brown algae.
  • Enhanced acetoclastic methanogenesis is key to improved methane productivity in saline environments.
  • This study demonstrates a viable strategy for sustainable biogas production from marine biomass.