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Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production

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Deep eutectic solvent with Lewis acid for highly efficient biohydrogen production from corn straw.

Xue Chen¹, Jungang Jiang², Jiubin Zhu³

¹College of Engineering, Jining University, Jining 273100, China.

Bioresource Technology

|August 16, 2022

Summary

Lewis acid enhanced deep eutectic solvent (DES) pretreatment significantly boosted corn straw saccharification and biohydrogen production. This method improved enzymatic hydrolysis efficiency and increased biohydrogen yield by 2.1 times compared to raw feedstock.

Keywords:

Biohydrogen Corn straw Dark fermentation Deep eutectic solvent Enzymatic saccharification

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Area of Science:

Biotechnology
Biochemical Engineering
Renewable Energy

Background:

Corn straw is an abundant lignocellulosic biomass resource.
Efficient conversion of lignocellulosic biomass is crucial for sustainable biohydrogen production.
Current pretreatment methods often face challenges in efficiency and environmental impact.

Purpose of the Study:

To develop an efficient pretreatment method for corn straw to enhance saccharification and biohydrogen production.
To investigate the effect of Lewis acid-enhanced deep eutectic solvent (DES) on biomass conversion.
To optimize the pretreatment conditions for maximum biohydrogen yield.

Main Methods:

Deep eutectic solvent (DES) pretreatment using choline chloride/glycerol with aluminum chloride (AlCl3) as a Lewis acid catalyst.
Enzymatic hydrolysis of pretreated corn straw.
Sequential dark fermentation for biohydrogen production.

Main Results:

Enzymatic hydrolysis efficiency increased from 26.3% to 87.0% after DES pretreatment.
A maximum biohydrogen yield of 114.8 mL/g total solids (TS) was achieved, a 2.1-fold increase compared to raw feedstock.
Effective removal of lignin and hemicellulose was observed, enhancing biomass accessibility.

Conclusions:

AlCl3-aided aqueous DES pretreatment is a highly effective method for enhancing corn straw saccharification and subsequent biohydrogen production.
The developed pretreatment strategy offers a promising approach for the efficient utilization of lignocellulosic biomass.
This work provides valuable insights for designing advanced DES systems for biorefinery applications.