Residue cornstalk derived biochar promotes direct bio-hydrogen production from anaerobic fermentation of cornstalk. (January 2021)

• Record Type: Journal Article
• Authors: Zhao, Lei; Wang, Zihan; Ren, Hong-Yu; Chen, Chuan; Nan, Jun; Cao, Guang-Li; Yang, Shan-Shan; Ren, Nan-Qi
• Is Part Of: Bioresource technology. Volume 320: Part A(2021)
• Publication Date: 2021-01
• Subjects: RCA-biochar -- Cornstalk -- Direct bio-hydrogen production -- Anaerobic fermentation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.124338
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Residue cornstalk from anaerobic H2 production was pyrolyzed to biochar (RCA-biochar). RCA-biochar enables a maximum bio-H2 yield of 286.1 mL H2 /g substrate. RCA-biochar promotes lignocellulose bioconversion to H2 efficiency. This study provides a new way for sustainable lignocellulosic bio-H2 production. Abstract: In this study, an innovative approach was proposed based on the implement of biochar derived from residue cornstalk left after anaerobic bio-hydrogen production (RCA-biochar) to improve direct bio-hydrogen production from anaerobic fermentation of cornstalk. The bio-hydrogen production potential and maximum bio-hydrogen production rate increased from 156.2 to 286.1 mL H2 /g substrate and 3.5 to 5.7 mL H2 /g substrate/h, respectively, following the added RCA-biochar increased from 2.5 to 15.0 g/L. Cornstalk chemical component analysis showed the cellulose and hemicellulose content decreased by 17.9–33.7% and 14.4–25.2%, and lignin content increased by 20.3–42.8%, respectively, after 96 h anaerobic fermentation with RCA-biochar 2.5–15.0 g/L. Further analyses revealed that RCA-biochar not only provided more specific surface area for hydrogen-producing bacteria attachment, but also promoted the cellulolytic enzyme activity, thereby resulted in increased substrate conversion to bio-hydrogen. The findings obtained in this study may provide supports for effective and sustainable lignocellulosic bio-hydrogen production in the future.