Multi-product biorefineries for biofuels and value-added products: advances and future perspectives

The urgent shift to a sustainable bio-based economy underscores the importance of multi-product biorefineries, which transform biomass into biofuels, biochemicals, and materials. Despite progress, challenges like high costs, technical barriers in biomass processing, and market uncertainties limit their widespread adoption. While prior studies have explored single-product biorefineries, a comprehensive analysis of integrated multi-product systems—focusing on efficiency, product diversity, and sustainability—remains underexplored. This study addresses this gap by examining advancements in lignocellulosic biomass, algal resources, agricultural residues, and municipal solid waste utilization, alongside innovations in biochemical, thermochemical, and hybrid conversion technologies. Objectives include assessing feedstock versatility, conversion efficiencies, economic viability, and environmental impacts. Key findings reveal enhanced yields through enzyme and microbial engineering, catalytic upgrades, and AI-driven optimization, with life cycle assessments showing significant greenhouse gas reductions. Economically, product diversification lowers costs, yet capital investment and market volatility persist as hurdles. This study concludes that multi-product biorefineries are vital for energy security and climate goals, integrating well with renewable energy and circular economy principles. Future research should prioritize scalable, modular designs adaptable to regional contexts, supported by robust policies to ensure economic and environmental success.