Co-ensiling as a new technique for long-term storage of agro-industrial waste with low sugar content prior to anaerobic digestion

[Display omitted] •Low initial soluble sugars content led to a succession of metabolic pathways.•Succession of metabolic pathways did not impact the BioMethane Potential.•Pretreatment of the lignocellulosic material has not been detected.•Co-ensiling is a successful option for long-term storage of f...

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Bibliographic Details
Published in:Waste management (Elmsford) 2018-01, Vol.71, p.147-155
Main Authors: Hillion, Marie-Lou, Moscoviz, Roman, Trably, Eric, Leblanc, Yoann, Bernet, Nicolas, Torrijos, Michel, Escudié, Renaud
Format: Article
Language:English
Subjects:
BMP
Environmental Sciences
Lactic acid fermentation
Life Sciences
Mixed culture
Silage
Storage
Wheat straw
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Summary:[Display omitted] •Low initial soluble sugars content led to a succession of metabolic pathways.•Succession of metabolic pathways did not impact the BioMethane Potential.•Pretreatment of the lignocellulosic material has not been detected.•Co-ensiling is a successful option for long-term storage of fermentable fresh matter. Biodegradable wastes produced seasonally need an upstream storage, because of the requirement for a constant feeding of anaerobic digesters. In the present article, the potential of co-ensiling biodegradable agro-industrial waste (sugar beet leaves) and lignocellulosic agricultural residue (wheat straw) to obtain a mixture with low soluble sugar content was evaluated for long-term storage prior to anaerobic digestion. The aim is to store agro-industrial waste while pretreating lignocellulosic biomass. The dynamics of co-ensiling was evaluated in vacuum-packed bags at lab-scale during 180 days. Characterization of the reaction by-products and microbial communities showed a succession of metabolic pathways. Even though the low initial sugars content was not sufficient to lower the pH under 4.5 and avoid undesirable fermentations, the methane potential was not substantially impacted all along the experiment. No lignocellulosic damages were observed during the silage process. Overall, it was shown that co-ensiling was effective to store highly fermentable fresh waste evenly with low sugar content and offers new promising possibilities for constant long-term supply of industrial anaerobic digesters.
ISSN:0956-053X
1879-2456
DOI:10.1016/j.wasman.2017.10.024