Effects of heat treatment on hydrogen production potential and microbial community of thermophilic compost enrichment cultures |
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| Authors: | Nissilä Marika E Tähti Hanne P Rintala Jukka A Puhakka Jaakko A |
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| Institution: | a Department of Chemistry and Bioengineering, Tampere University of Technology, Tampere, Finland
b Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland |
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| Abstract: | 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 °C. Highest cellulose degradation and highest H2 yield were 57% and 1.4 mol-H2 mol-hexose−1 (2.4 mol-H2 mol-hexose-degraded−1), respectively, obtained at 52 °C with the heat-treated (80 °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. |
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| Keywords: | Dark fermentation Cellulose Mixed culture Thermophilic Thermoanaerobium thermosaccharolyticum |
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