Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 6, Pages 4501-4506Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.12.072
Keywords
Dark fermentation; Cellulose; Mixed culture; Thermophilic; Thermoanaerobium thermosaccharolyticum
Funding
- University Alliance, Finland
- Nordic Energy Research [06-Hydr-C13]
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Cellulosic plant and waste materials are potential resources for fermentative hydrogen production. In this study, hydrogen producing, cellulolytic cultures were enriched from compost material at 52, 60 and 70 degrees C. Highest cellulose degradation and highest H-2 yield were 57% and 1.4 mol-H-2 mol-hexose(-1) (2.4 mol-H-2 mol-hexose-degraded(-1)), respectively, obtained at 52 degrees C with the heat-treated (80 degrees C for 20 min) enrichment culture. Heat-treatments as well as the sequential enrichments decreased the diversity of microbial communities. The enrichments contained mainly bacteria from families Thermoanaerobacteriaceae and Clostridiaceae, from which a bacterium closely related to Thermoanaerobium thermosaccharolyticum was mainly responsible for hydrogen production and bacteria closely related to Clostridium cellulosi and Clostridium stercorarium were responsible for cellulose degradation. (C) 2010 Elsevier Ltd. All rights reserved.
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