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Photosynthetic Biogas Upgrading Using Microalgal-Bacterial Consortia: Fundamentals, Process Optimization and

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Summary

Photosynthetic biogas upgrading uses microalgal-bacterial consortia to purify biogas, recovering nutrients and supporting a net-zero carbon economy. This integrated process enhances biomethane production for renewable energy applications.

Keywords:
CO2 removalbioenergybiogas upgradingmicroalgae biostimulationphotobioreactor

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Environmental Science

Background:

  • Biogas upgrading is crucial for its use as a natural gas substitute.
  • Current methods face limitations in efficiency and integration.
  • Photosynthetic upgrading offers a novel, integrated solution.

Purpose of the Study:

  • To review progress in photosynthetic biogas upgrading.
  • To highlight the symbiotic action of microalgal-bacterial consortia.
  • To discuss factors influencing process performance and future potential.

Main Methods:

  • Utilizes a two-stage system: absorption unit and photobioreactor.
  • Employs microalgal-bacterial consortia for pollutant removal and nutrient recovery.
  • Investigates the impact of liquid to gas (L/G) ratio and nutrient media.

Main Results:

  • Optimal L/G ratios (0.5-1.0) balance CO2 removal and CH4 dilution.
  • High-alkalinity media (1.5-2.5 gIC L-1) and pH > 9 are essential for CO2 mass transfer.
  • Robust microalgae/cyanobacteria like *Chlorella vulgaris* dominate these systems.

Conclusions:

  • Photosynthetic biogas upgrading is a promising biotechnology for efficient biogas purification.
  • Biostimulation of photosynthesis can enhance biomass productivity and CO2 removal.
  • This integrated approach facilitates large-scale biomethane production and nutrient recovery.