Potential use of thermophilic dark fermentation effluents in photofermentative hydrogen production by Rhodobacter capsulatus |
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| Authors: | Ebru Özgür Nilüfer Afsar Truus de Vrije Meral Yücel Ufuk Gündüz Pieternel AM Claassen Inci Eroglu |
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| Institution: | 1. Middle East Technical University, Department of Chemical Engineering, 06531 Ankara, Turkey;2. Wageningen UR, Agrotechnology & Food Sciences Group, Wageningen UR, P.O. Box 17, 6700 AA Wageningen, The Netherlands;3. Middle East Technical University, Department of Biology, 06531 Ankara, Turkey;1. Department of Microbiology & Microbe and Plant Biotechnology, Biology Faculty, Yerevan State University, 1 A. Manoukian Str., 0025 Yerevan, Armenia;2. Department of Biophysics, Biology Faculty, Yerevan State University, 1 A. Manoukian Str., 0025 Yerevan, Armenia;1. Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via Di Biasio 43, 03043 Cassino, FR, Italy;2. Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, 80125 Naples, Italy;3. Department of Mathematics and Applications Renato Caccioppoli, University of Naples Federico II, via Cintia, Monte S. Angelo, I-80126 Naples, Italy;4. UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX Delft, The Netherlands;1. Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal, CP6128 Succursale Centre-ville, Montréal, Québec H3C 3J7 Canada;2. Faculty of Engineering, Department of Chemical Engineering, Ankara University, Tandogan, 06100 Ankara, Turkey;3. Life Sciences Research Center, Department of Biology, United States Air Force Academy, 2355 Faculty Drive, USAF Academy, Colorado 80840, USA |
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| Abstract: | Biological hydrogen production by a sequential operation of dark and photofermentation is a promising route to produce hydrogen. The possibility of using renewable resources, like biomass and agro-industrial wastes, provides a dual effect of sustainability in biohydrogen production and simultaneous waste removal. In this study, photofermentative hydrogen production on effluents of thermophilic dark fermentations on glucose, potato steam peels (PSP) hydrolysate and molasses was investigated in indoor, batch operated bioreactors. An extreme thermophile Caldicellulosiruptor saccharolyticus was used in the dark fermentation step, and Rhodobacter capsulatus (DSM1710) was used in the photofermentation step. Addition of buffer, Fe and Mo to dark fermentor effluents (DFEs) improved the overall efficiency of hydrogen production. The initial acetate concentration in the DFE needed to be adjusted to 30–40 mM by dilution to increase the yield of hydrogen in batch light-supported fermentations. The thermophilic DFEs are suitable for photofermentative hydrogen production, provided that they are supplemented with buffer and nutrients. The overall hydrogen yield of the two-step fermentations was higher than the yield of single step dark fermentations. |
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