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The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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Bioethanol production from industrial algae waste.

V Alfonsín1, R Maceiras1, C Gutiérrez2

  • 1Centro Universitario de la Defensa, Escuela Naval Militar, Plaza de España 2, 36920 Marín, Spain.

Waste Management (New York, N.Y.)
|May 22, 2019
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This study explores converting industrial algae waste into bioethanol. Researchers optimized acid hydrolysis and fermentation, achieving a high bioethanol yield and demonstrating the waste

Keywords:
Acid hydrolysisBioethanolFermentationIndustrial algae wasteSolid biomass

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Chemical Engineering

Background:

  • Industrial algae waste presents a significant disposal challenge.
  • Valorization of algal biomass is crucial for sustainable resource management.
  • Bioethanol production from waste streams offers a promising alternative to fossil fuels.

Purpose of the Study:

  • To determine the feasibility of producing bioethanol from industrial algae waste (Euchema Spinosum).
  • To optimize acid hydrolysis parameters for maximizing reducing sugar yield.
  • To evaluate the potential of algal residue as a sustainable solid fuel.

Main Methods:

  • Acid hydrolysis of algae waste using varying parameters (acid concentration, temperature, time).
  • Ethanolic fermentation of hydrolysates using Saccharomyces Cerevisiae.
  • Analysis of the physicochemical properties of the residual algal biomass.

Main Results:

  • Optimized hydrolysis conditions (9% sulfuric acid, 70 min, acid/algae ratio of 7) yielded high reducing sugars.
  • Achieved a maximum bioethanol yield of 11.6 gEtOH/g_algae.
  • Demonstrated a 75% conversion efficiency of algal carbohydrates to bioethanol.
  • Identified potential for the residue as a sustainable solid fuel.

Conclusions:

  • Industrial algae waste is a viable feedstock for bioethanol production.
  • Acid hydrolysis and fermentation are effective methods for bioethanol recovery.
  • Algal biomass valorization contributes to a circular economy and sustainable energy solutions.