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Valorizing Every Carbon Atom: A Cascade Bioprocess for Advanced Biofuels from Corn-Stover-Derived Lignocellulose
Tianjie Ao1,2, Yiping Luo1, Javier Remón3
1Agricultural Microbial Agents Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan 610213, PR China.
Environmental Science & Technology
|December 17, 2025
Summary
This study introduces an integrated biorefinery process that improves carbon efficiency in ethanol production from corn stover. The novel system captures and reuses carbon dioxide, increasing overall carbon utilization for sustainable biofuel generation.
Area of Science:
- Biomass Conversion and Bioenergy
- Chemical Engineering
- Environmental Science
Background:
- Conventional lignocellulosic biorefining loses significant carbon (CO2) during ethanol fermentation, reducing overall efficiency.
- Corn stover (CS) is a promising feedstock, but its efficient conversion into biofuels remains a challenge.
- Existing processes often fail to valorize all carbon streams, leading to waste and lower economic viability.
Purpose of the Study:
- To develop and validate a holistically integrated cascade biorefining process for enhanced carbon utilization from lignocellulosic biomass.
- To couple ethanol fermentation, anaerobic digestion, and cyanobacterial cultivation for comprehensive carbon stream valorization.
- To assess the techno-economic feasibility of the integrated process at an industrial scale.
Main Methods:
- Engineered yeast (Saccharomyces cerevisiae CE10) for high-productivity ethanol fermentation.
- Anaerobic digestion of stillage to produce methane and nutrient-rich digestate.
- Cultivation of cyanobacteria (Desertifilum tharense BERC03) using captured CO2 and digestate.
- Techno-economic analysis of a 2000 t/d industrial-scale facility.
Main Results:
- Achieved high ethanol fermentation productivity (1.68 g/L/h).
- Efficiently converted residual organics into methane (171 L/kg COD) with 80% COD removal via anaerobic digestion.
- Increased overall carbon utilization from 48% to 62%.
- Projected a Minimum Ethanol Selling Price (MESP) of $2.44/gallon for the industrial-scale facility.
Conclusions:
- The integrated cascade biorefinery model significantly enhances carbon recovery and utilization from lignocellulosic biomass.
- The process demonstrates a viable pathway for coproduction of multiple biofuels, including ethanol and methane.
- Feedstock and cellulase costs are identified as primary economic drivers, suggesting areas for future optimization.
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