Assessment of hydrothermal pretreatment of various lignocellulosic biomass with CO2 catalyst for enhanced methane and hydrogen production

WATER RESEARCH

卷:120

Article

Eskicioglu, Cigdem^1,2  Monlau, Florian³  Barakat, Abdellatif^3,6  Ferrer, Ivet⁴  Kaparaju, Prasad^2,5  Trably, Eric²  Carrere, Helene² 

[1] Univ British Columbia, Sch Engn, UBC Bioreactor Technol Grp, Okanagan Campus,3333 Univ Way, Kelowna, BC V1V 1V7, Canada

[2] INRA, LBE, F-11100 Narbonne, France

[3] Univ Montpelier, INRA, Montpellier SupAgro, IATE,CIRAD, F-34060 Montpellier, France

[4] Univ Politecn Cataluna, Barcelona Tech, Dept Civil & Environm Engn, GEMMA Grp Environm Engn & Microbiol, C Jordi Girona 1-3,Bldg D1, E-08034 Barcelona, Spain

[5] Griffith Univ, Griffith Sch Engn, Nathan Campus,170 Kessels Rd, Nathan, Qld 4111, Australia

[6] Mohamed 6 Polytech Univ, Mat Sci & Nanoengn Dept, Lot 660, Hay Moulay Rachid 43150, Benguerir, Morocco

关键词: Anaerobic digestion;    Dark fermentation;    Straw;    Sorghum;    Corn stover;    Douglas fir bark;   

DOI  :  10.1016/j.watres.2017.04.068

来源: Elsevier

【 摘 要 】

Hydrothermal pretreatment of five lignocellulosic substrates (i.e. wheat straw, rice straw, biomass sorghum, corn stover and Douglas fir bark) were conducted in the presence of CO2 as a catalyst. To maximize disintegration and conversion into bioenergy (methane and hydrogen), pretreatment temperatures and subsequent pressures varied with a range of 26-175 degrees C, and 25-102 bars, respectively. Among lignin, cellulose and hemicelluloses, hydrothermal pretreatment caused the highest reduction (23-42%) in hemicelluloses while delignification was limited to only 0-12%. These reductions in structural integrity resulted in 20-30% faster hydrolysis rates during anaerobic digestion for the pretreated substrates of straws, sorghum, and corn stover while Douglas fir bark yielded 172% faster hydrolysis/digestion due to its highly refractory nature in the control. Furans and phenolic compounds formed in the pretreated hydrolyzates were below the inhibitory levels for methane and hydrogen production which had a range of 98-340 ml CH4/g volatile solids (VS) and 5-26 ml H-2/g VS, respectively. Results indicated that hydrothermal pretreatment is able to accelerate the rate of biodegradation without generating high levels of inhibitory compounds while showing no discernible effect on ultimate biodegradation. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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