Yields from glucose, xylose, and paper sludge hydrolysate during hydrogen production by the extreme thermophile Caldicellulosiruptor saccharolyticus |
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Authors: | Zsófia Kádár Truus de Vrije Giel E van Noorden Miriam A W Budde Zsolt Szengyel Kati Réczey Pieternel A M Claassen |
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Institution: | (1) Agrotechnology & Food Innovations, PO Box 17, 6700 AA Wageningen, The Netherlands;(2) Department of Agricultural Chemical Technology, Budapest University of Technology and Economics, Szent Gellért tér 4., H-1521 Budapest, Hungary |
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Abstract: | This study addressed the utilization of an industrial waste stream, paper sludge, as a renewable cheap feedstock for the fermentative
production of hydrogen by the extreme thermophile Caldicellulosiruptor saccharolyticus. Hydrogen, acetate, and lactate were produced in medium in which paper sludge hydrolysate was added as the sole carbon and
energy source and in control medium with the same concentration of analytical grade glucose and xylose. The hydrogen yield
was dependent on lactate formation and varied between 50 and 94% of the theoretical maximum. The carbon balance in the medium
with glucose and xylose was virtually 100%. The carbon balance was not complete in the paper sludge medium because the measurement
of biomass was impaired owing to interfering components in the paper sludge hydrolysate. Nevertheless, >85% of the carbon
could be accounted for in the products acetate and lactate. The maximal volumetric hydrogen production rate was 5 to 6 mmol/(L·h),
which was lower than the production rate in media with glucose, xylose, or a combination of these sugars (9–11 mmol/L·h]).
The reduced hydrogen production rate suggests the presence of inhibiting components in paper sludge hydrolysate. |
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Keywords: | Hydrogen production paper sludge hydrolysate extreme thermophile Caldicellulosiruptor saccharolyticus glucose xylose carbon balances |
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