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Microbial Fermentation01:23

Microbial Fermentation

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Fermentation is a crucial anaerobic metabolic process that enables microbes to derive energy from sugar without relying on oxygen or an electron transport chain. This process is fundamental to various biological and industrial applications and is classified based on the metabolic products generated.Role of Pyruvate in FermentationPyruvate and its derivatives serve as key electron acceptors in fermentative pathways. The oxidation of NADH to regenerate NAD+ is essential for the continuation of...
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Valorization of Anaerobic-Fermentation Liquid Digestates-Membrane-Based Process Development.

Charikleia Tsaridou1, Anthoula Karanasiou1, Konstantinos V Plakas1

  • 1Laboratory of Natural Resources and Renewable Energies, Chemical Process and Energy Resources Institute, Centre for Research and Technology-Hellas (CERTH), 57001 Thermi-Thessaloniki, Greece.

Membranes
|March 29, 2023
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Summary

This study presents a membrane-based method for fully valorizing liquid digestate from anaerobic fermentation. The process recovers nutrients and recycles water, advancing circular economy goals for waste management.

Keywords:
P, N nutrientsanaerobic fermentationliquid digestate valorizationmembrane process treatmentwater recycling

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Area of Science:

  • Environmental Engineering
  • Chemical Engineering
  • Sustainable Chemistry

Background:

  • Complete valorization of waste digestate is crucial for a circular economy.
  • Anaerobic fermentation produces biogas but leaves nutrient-rich digestate requiring further treatment.
  • Existing methods struggle with complete digestate valorization, including nutrient recovery and water reuse.

Purpose of the Study:

  • To develop a systematic methodology for valorizing liquid digestate using membrane technology.
  • To enable nutrient recovery and water recycling from digestate for sustainable process development.
  • To advance the technology readiness level of membrane-based digestate treatment.

Main Methods:

  • Utilized ultrafiltration (UF) for sludge separation from liquid digestate.
  • Employed nanofiltration (NF) and reverse osmosis (RO) for permeate recycling and reuse.
  • Concentrate stream, rich in phosphate and ammonium, targeted for soil fertilization.

Main Results:

  • Developed a membrane-based processing scheme for liquid digestate valorization.
  • Achieved high technology readiness level through laboratory experiments and simulations.
  • Designed, constructed, and preliminarily tested a pilot unit with satisfactory outcomes.

Conclusions:

  • The proposed membrane process effectively valorizes liquid digestate, recovering nutrients and recycling water.
  • The methodology is suitable for treating similar industrial effluents and advancing circular economy principles.
  • Further pilot testing in industrial settings will optimize the process for practical applications.