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Refining of vegetable waste to renewable sugars for ethanol production: Depolymerization andfermentation

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Waste Valorization

Background:

  • Agricultural byproducts, including composite vegetable waste (CVW), potato waste (PW), sweet potato waste (SPW), and yam waste (YW), represent a significant underutilized resource.
  • Developing sustainable methods for converting biomass into valuable products is crucial for a circular economy and reducing reliance on fossil fuels.

Purpose of the Study:

  • To assess the efficacy of different vegetable wastes as feedstocks for producing fermentable sugars.
  • To optimize the conversion of these sugars into bioethanol using Saccharomyces cerevisiae.
  • To evaluate the overall sustainability and economic viability of utilizing vegetable waste in a biorefinery context.

Main Methods:

  • Vegetable wastes underwent thermal-assisted chemical pretreatment followed by enzymatic saccharification to produce reducing sugars.
  • Fermentation of the obtained sugars into bioethanol was performed using S. cerevisiae, with pH and temperature optimization.
  • Sugar yields and ethanol production efficiencies were quantified for each waste type.

Main Results:

  • Maximum sugar yields were achieved from sweet potato waste (0.57 g/g) and yam waste (0.56 g/g), with high carbohydrate depolymerization rates.
  • The highest bioethanol yield (251.85 mg/g) was obtained from sweet potato waste at 35°C and pH 5.0.
  • Significant ethanol yields were also observed from yam waste (240.98 mg/g) and potato waste (235.4 mg/g).

Conclusions:

  • Vegetable wastes are viable and sustainable feedstocks for the production of renewable sugars and bioethanol.
  • Optimized pretreatment and fermentation processes enhance the efficiency of bioethanol production from these wastes.
  • The valorization of vegetable waste contributes positively to the economics and sustainability of circular biorefineries.