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<p>An investigation has been performed for alcoholic fermentation from bread waste. Some concentrations of bread waste-derived biochar (BWB) have been selected to optimize ethanol concentration. For this, three biochar concentrations have been used: 2.5, 5 and 7.5&#xa0;g/L. Different parameters have been followed up and evaluated: yeast concentration, pH, ethanol concentration, and total sugars. It has been found that elementary analysis of biochar revealed a high percentage of carbon (57.92%) and oxygen (23.34%). Moreover, the addition of biochar to the bread waste hydrolysate resulted in a significant increase in the bioethanol concentration; it varies from 85&#xa0;g/L to 110&#xa0;g/L for a biochar concentration of 7.5&#xa0;g/L. This is due to the fact that biochar provides a high surface for yeast to be fixed and grow, hence increasing their ability to ferment sugars into ethanol. This is significantly high when comparing it to the fermentation process without adding biochar, which is only about 85&#xa0;g/L. The hydrolysate medium has a mixture of sugars that are easily transported to the cell membrane and then assimilated to reach the values of 78&#xa0;g/L, 70&#xa0;g/L, and 66&#xa0;g/L for biochar concentrations of 2.5, 5 and 7.5&#xa0;g/L, respectively. These findings highlight the potential of bread waste-derived biochar to enhance bioethanol production, offering a sustainable and efficient approach to biofuel production. Furthermore, this study serves as one of the pioneering researches into the application of biochar in alcoholic fermentation.</p> Graphical abstract <p></p>

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Improving bioethanol production through the use of bread waste-derived biochar as an additive in alcoholic fermentation

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Fatima Zohra Kahlouche,
  • Souhaib Zerrouki,
  • Rachida Rihani

摘要

An investigation has been performed for alcoholic fermentation from bread waste. Some concentrations of bread waste-derived biochar (BWB) have been selected to optimize ethanol concentration. For this, three biochar concentrations have been used: 2.5, 5 and 7.5 g/L. Different parameters have been followed up and evaluated: yeast concentration, pH, ethanol concentration, and total sugars. It has been found that elementary analysis of biochar revealed a high percentage of carbon (57.92%) and oxygen (23.34%). Moreover, the addition of biochar to the bread waste hydrolysate resulted in a significant increase in the bioethanol concentration; it varies from 85 g/L to 110 g/L for a biochar concentration of 7.5 g/L. This is due to the fact that biochar provides a high surface for yeast to be fixed and grow, hence increasing their ability to ferment sugars into ethanol. This is significantly high when comparing it to the fermentation process without adding biochar, which is only about 85 g/L. The hydrolysate medium has a mixture of sugars that are easily transported to the cell membrane and then assimilated to reach the values of 78 g/L, 70 g/L, and 66 g/L for biochar concentrations of 2.5, 5 and 7.5 g/L, respectively. These findings highlight the potential of bread waste-derived biochar to enhance bioethanol production, offering a sustainable and efficient approach to biofuel production. Furthermore, this study serves as one of the pioneering researches into the application of biochar in alcoholic fermentation.

Graphical abstract