Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 37, Issue 10, Pages 8800-8810Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2012.01.132
Keywords
Dark fermentation; Repeated batch cultivation; Hydrogen production; Integrated system; Purple photosynthetic bacteria
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Funding
- Russian Academy of Sciences [7]
- Russian Foundation for Basic Research [11-04-01383]
- NREL (Golden, CO, USA) [AFA-0-99178-01]
- US Department of Energy under NREL [DE-AC36-08-GO28308]
- NREL
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In this study we demonstrated the technical feasibility of a prolonged, sequential two-stage integrated process under a repeated batch mode of starch fermentation. In this durable scheme, the photobioreactor with purple bacteria in the second stage was fed directly with dark culture from the first stage without centrifugation, filtration, or sterilization (not demonstrated previously). After preliminary optimization, both the dark- and the photo-stages were performed under repeated batch modes with different process parameters. Continuous H-2 production in this system was observed at a H-2 yield of up to 1.4 and 3.9 mole mole(-1) hexose during the dark- and photo-stage, respectively (for a total of 5.3 mole mole(-1) hexose), and rates of 0.9 and 0.5 L L-1 d(-1), respectively. Prolonged repeated batch H-2 production was maintained for up to 90 days in each stage and was rather stable under non-aseptic conditions. Potential for improvements in these results are discussed. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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