Work

Continuous H2 production during fermentation of the carbon components of lignocellulose hydrolysates: Insight into the influence of pH conditions on the conversion efficiency of individual sugars

Year: 2022

Type: article

Abstract: Sugars released from lignocellulose biomass are a promising substrate for biohydrogen production. This study evaluates the effect of pH controlled between 4.0 and 7.5 on continuous dark-fermentative H2 production from the mixture of cellobiose, xylose and arabinose. High hydrogen production rate was obtained for pH values between 6.0 and 7.0 with a maximum of 7.41 ± 0.16 L/L-d at pH 7.0. On the other hand, the highest H2 yields of around 1.74 ± 0.02 mol/molconsumed were obtained at pH 4.5, 5.0 and 6.0. Cellobiose was completely utilized in nearly the entire pH range, while the highest consumption of xylose and arabinose was obtained at pH 6.0 and 7.0, respectively. It shows the challenges in selecting optimum pH for fermentation of mixed sugars. Significant impact of pH conditions on the microbial structure was observed. Between pH 4.0 and 7.0 Clostridium genus dominated the consortium, while above pH 7.0 relative abundance of Bacillus genus increased significantly.

Source: International Journal of Hydrogen Energy

DOI: 10.1016/j.ijhydene.2022.08.165

Author: Roman Zagrodnik

Institution: Adam Mickiewicz University in Poznań

Language: English

Topic: Anaerobic Digestion and Biogas Production

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,250