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Related Experiment Video

Updated: Jan 29, 2026

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Process integration for ethanol production from corn and corn stover as mixed substrates.

Jianming Yu1, Zhaoxian Xu1, Lei Liu2

  • 1School of Environmental and Biological Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Street, Nanjing 210094, China.

Bioresource Technology
|February 3, 2019
PubMed
Summary

This study explored ethanol production from corn and corn stover (CS). Mixing corn with CS hydrolysate for liquefaction and SSF yielded the highest ethanol titer (99.3 g/L) at a 20%:10% ratio, optimizing biofuel production.

Keywords:
Cellulosic ethanolCorn ethanolIntegrated ethanol production processThe first generation ethanolThe second generation ethanol

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Area of Science:

  • Biochemical Engineering
  • Renewable Energy
  • Biotechnology

Background:

  • Efficient ethanol production from mixed feedstocks is crucial for sustainable biofuel development.
  • Corn stover (CS) is an abundant lignocellulosic biomass, but its utilization requires effective pretreatment and integration strategies.
  • Optimizing the process integration of corn and pretreated CS can enhance ethanol yield and productivity.

Purpose of the Study:

  • To investigate and compare various process integration strategies for ethanol production using corn and dilute acid pretreated corn stover (CS) as mixed substrates.
  • To determine the optimal ratio of corn to pretreated CS and the best integration strategy for maximizing ethanol production.
  • To evaluate the impact of different integration approaches on ethanol titer and productivity.

Main Methods:

  • Examined three different ratios of corn to pretreated CS: 20%:10%, 10%:20%, and 5%:25%.
  • Investigated process integration strategies including mixing substrates at different stages (liquefaction, hydrolysis/saccharification) followed by simultaneous saccharification and fermentation (SSF) or separate hydrolysis and fermentation (SHF).
  • Quantified ethanol titer (g/L) and productivity under various conditions.

Main Results:

  • The highest ethanol titer of 99.3 g/L was achieved with a 20%:10% ratio of corn to pretreated CS, using a strategy of mixing corn with CS hydrolysate for liquefaction followed by SSF.
  • For the other two ratios (10%:20% and 5%:25%), mixing liquefied corn with pretreated CS for hydrolysis/saccharification followed by fermentation proved to be the most effective strategy.
  • The strategy involving mixing liquefied corn with pretreated CS for 6-hour hydrolysis followed by fermentation demonstrated the highest overall productivity across all tested ratios.

Conclusions:

  • Process integration strategy significantly impacts ethanol production efficiency from mixed corn and corn stover substrates.
  • Optimal substrate ratios and integration methods are critical for maximizing ethanol titer and productivity in lignocellulosic biofuel production.
  • Further research into optimizing hydrolysis and fermentation steps can lead to more efficient and cost-effective biofuel production processes.