Feasibility of enhancing hydrogen production from cornstalk hydrolysate anaerobic fermentation by RCPH-biochar. (February 2020)

• Record Type: Journal Article
• Authors: Zhao, Lei; Chen, Chuan; Ren, Hong-Yu; Wu, Jie-Ting; Meng, Jia; Nan, Jun; Cao, Guang-Li; Yang, Shan-Shan; Ren, Nan-Qi
• Is Part Of: Bioresource technology. Volume 297(2020)
• Publication Date: 2020-02
• Subjects: RCPH-biochar -- Cornstalk hydrolysate -- Hydrogen production -- Comprehension cornstalk utilization; 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.2019.122505
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Biochar was prepared from residue cornstalk left after pretreatment and hydrolysis. Prepared biochar was employed to improve H2 yield from cornstalk hydrolysate. Overall material balance shows biochar enable higher substrate recovery efficiency. This study provides a new way for comprehensive utilization of cornstalk. Abstract: This study presents a novel approach based on addition of biochar generated from residue of cornstalk left after pretreatment and hydrolysis (RCPH-biochar) to improve hydrogen production from cornstalk hydrolysate. RCPH-biochar at concentration of 15 g L −1 substantially enhanced hydrogen generation during batch tests, with the highest cumulative hydrogen volume (3990 mL L −1 ) being 1.7 times that without RCPH-biochar. Then, continuous hydrogen production performance demonstrated that RCPH-biochar was capable of retaining biomass in the reactor, at 6 h hydraulic retention time, hydrogen production rate (22.8 mmol H2 L −1 h −1 ) was tripled compared to the control, meanwhile, glucose and xylose utilization reached to 82.3% and 54.6%, respectively. Overall material balance indicates continuous hydrogen production with RCPH-biochar enabled 63.4% higher cornstalk transfer to H2 and 53.3% more cornstalk utilization. The findings reported is a closed-loop process and is economically and environmentally attractive, which might support comprehensive cornstalk utilization with less energy input in the future.