Bioethanol Production from Agro-Industrial Wastes

Agro-industrial wastes encompass a broad array of by-products from agricultural and food processing industries, including residues such as fruit peels, cereal straws, sugarcane bagasse and various pomaces. These materials represent an abundant, low-cost feedstock for second-generation bioethanol production, circumventing the food–fuel conflict associated with first-generation crops. Conversion typically involves a sequence of pretreatment to disrupt lignocellulose structure, enzymatic saccharification to release fermentable sugars and subsequent microbial fermentation to yield ethanol. Advances in chemical, physical and biological pretreatment strategies have achieved substantial delignification and enhanced cellulose accessibility. Novel enzyme cocktails, often supplemented by accessory enzymes such as β-glucosidases, have improved saccharification yield and reduced enzyme loading. On the fermentation front, robust yeast and bacterial strains, as well as co-fermentation and consolidated bioprocessing approaches, have demonstrated higher ethanol titres and resilience to inhibitory compounds. Integrated biorefinery schemes further valorise co-products such as lignin for bio-based materials and energy, improving overall process economics and sustainability. Global research increasingly focuses on optimising techno-economic and life-cycle assessments, particularly for regionally abundant wastes like banana stems, pineapple leaves and cereal straws, highlighting the potential to decarbonise transport and bolster rural economies while addressing waste-management challenges.

Research from Nature Portfolio

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Bioethanol Production from Agro-Industrial Wastes publication trend

The graph below shows the total number of articles in bioethanol production from agro-industrial wastes across all publications each year (not limited to Nature Index journals).

Technical terms

Agro-industrial wastes: Residual organic materials generated by agricultural and food processing activities.

Lignocellulosic biomass: Plant biomass composed of cellulose, hemicellulose and lignin, serving as a feedstock for ethanol production.

Pretreatment: Physical, chemical or biological treatment to disrupt biomass structure and enhance enzyme accessibility.

Saccharification: Enzymatic hydrolysis of polysaccharides into fermentable sugars.

Consolidated bioprocessing: A single-stage process combining enzyme production, saccharification and fermentation in one reactor.

References

1. Bioethanol from canary banana waste as an energy source to reduce the carbon footprint of island electricity systems. Fuel (2024).
2. Underutilized Lignocellulosic Waste as Sources of Feedstock for Biofuel Production in Developing Countries. Frontiers in Energy Research (2022).
3. Recent Updates on the Conversion of Pineapple Waste (Ananas comosus) to Value-Added Products, Future Perspectives and Challenges. Agronomy (2021).
4. Experimental Investigation, Techno-Economic Analysis and Environmental Impact of Bioethanol Production from Banana Stem. Energies (2019).