Journal
BIORESOURCE TECHNOLOGY
Volume 189, Issue -, Pages 138-144Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.04.010
Keywords
Microbial communities; Pyrosequencing; Anaerobic digestion; Composting; Process engineering
Funding
- FRIA Ph.D. grant from the Belgian Fund for Scientific research (FNRS)
- Region Wallonne of Belgium
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A cellulolytic consortium was isolated from a composting plant in order to boost the initial hydrolysis step encountered in anaerobic digestion. Improvement of the cellulose degradation, as well as biogas production, was observed for the cultures inoculated with the exogenous consortium. Metagenomics analyses pointed out a weak richness (related to the number of OTUs) of the exogenous consortium induced by the selective pressure (cellulose as sole carbon source) met during the initial isolation steps. Main microbial strains determined were strictly anaerobic and belong to the Clostridia class. During cellulose anaerobic degradation, pH drop induced a strong modification of the microbial population. Despite the fact that richness and evenness were very weak, the exogenous consortium was able to adapt and to maintain the cellulolytic degradation potential. This important result point out the fact that simplified microbial communities could be used in order to increase the robustness of mixed cultures involved in environmental biotechnology. (C) 2015 Elsevier Ltd. All rights reserved.
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