Journal
BIORESOURCE TECHNOLOGY
Volume 236, Issue -, Pages 225-233Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.03.083
Keywords
Lignocellulose bioconversion; Anaerobic microbial consortium; Carboxylate production; Enzymes; Dry chemo-mechanical pretreatment
Funding
- French National Agency for Energy and the Environment (ADEME)
- CEPIA department of INRA
- PROBIOS project - Carnot Institute 3BCAR
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Innovative dry chemo-and chemo-mechanical pretreatments form an interesting approach for modifying the native physico-chemical composition of lignocellulose facilitating its microbial conversion to carboxylates. Here, the impact of four dry-pretreatment conditions on the microbial transformation of wheat straw was assessed: milling to 2 mm and 100 mm, and NaOH chemical impregnation at high substrate concentrations combined with milling at 2 mm and 100 mm. Pretreatment effect was assessed in the light of substrate structure and composition, its impact on the acidogenic potential and the major enzyme activities of a rumen-derived microbial consortium RWS. Chemo-mechanical pretreatment strongly modified the substrate macroporosity. The highest carboxylate production rate was reached after dry chemo-mechanical treatment with NaOH at 100 mm. A positive impact of the dry chemomechanical treatment on xylanase activity was observed also. These results underline that increasing substrate macroporosity by dry chemo-mechanical pretreatment had a positive impact on the microbial acidogenic potential. (C) 2017 Elsevier Ltd. All rights reserved.
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