Cellulose accessibility and microbial community in solid state anaerobic digestion of rape straw

•Rapeseed straw is a potential feedstock for SSAD.•Improving cellulose accessibility improves the methane yield and production rate.•SSAD of rape straw reached 60% of its BMP in a 40-day pilot-scale test.•Distinct microbial communities were observed in digested rape straw and leachate. Solid state a...

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Bibliographic Details
Published in:Bioresource technology 2017-01, Vol.223, p.192-201
Main Authors: Tian, Jiang-Hao, Pourcher, Anne-Marie, Bureau, Chrystelle, Peu, Pascal
Format: Article
Language:English
Subjects:
Anaerobiosis - physiology
Archaea - metabolism
Bacteroides - metabolism
Biomass
Bioreactors - microbiology
Biota - physiology
Brassica rapa - chemistry
Brassica rapa - metabolism
Cellulase - metabolism
Cellulose - metabolism
Cellulose accessibility
Digestion
Environmental Sciences
Leach bed reactor
Methane - biosynthesis
Methane production kinetics
Microbial community
Pilot Projects
Rape straw
Solid-state anaerobic digestion
Sphingobacterium - metabolism
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - metabolism
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Summary:•Rapeseed straw is a potential feedstock for SSAD.•Improving cellulose accessibility improves the methane yield and production rate.•SSAD of rape straw reached 60% of its BMP in a 40-day pilot-scale test.•Distinct microbial communities were observed in digested rape straw and leachate. Solid state anaerobic digestion (SSAD) with leachate recirculation is an appropriate method for the valorization of agriculture residues. Rape straw is a massively produced residue with considerable biochemical methane potential, but its degradation in SSAD remains poorly understood. A thorough study was conducted to understand the performance of rape straw as feedstock for laboratory solid state anaerobic digesters. We investigated the methane production kinetics of rape straw in relation to cellulose accessibility to cellulase and the microbial community. Improving cellulose accessibility through milling had a positive influence on both the methane production rate and methane yield. The SSAD of rape straw reached 60% of its BMP in a 40-day pilot-scale test. Distinct bacterial communities were observed in digested rape straw and leachate, with Bacteroidales and Sphingobacteriales as the most abundant orders, respectively. Archaeal populations showed no phase preference and increased chronologically.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.10.009