Pilot-scale outdoor photofermentative hydrogen production from molasses using pH control

Date

2020-01-01

Author

Oflaz, F. Betül
Koku, Harun

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© 2020 Hydrogen Energy Publications LLCThe duration of photofermentative hydrogen production from sugar-based nutrients is limited by gradual acidification caused by the production of organic acids, leading to suboptimal pH. To address this issue, a custom pH control system was built and installed on a 20 L tubular photobioreactor, and operated under outdoor conditions. Long-term, single-stage hydrogen production from molasses was achieved using the purple non-sulfur bacterium, Rhodobacter capsulatus. The run lasted for 48 days, the longest duration achieved in a tubular photobioreactor on molasses as the only feed. pH was maintained close to its optimum value. High-purity hydrogen (above 90% by mole, on average) and near-complete conversion of sucrose was observed. The highest hydrogen productivity was 0.69 molH2/(m3.h). On the other hand, hydrogen production was observed to cease after periods of activity. Production resumed after dilution followed by artificial illumination, indicating that the production activity could be recovered during prolonged runs.

Subject Keywords

Fuel Technology, Renewable Energy, Sustainability and the Environment, Energy Engineering and Power Technology, Condensed Matter Physics

URI

https://hdl.handle.net/11511/69571

Journal

International Journal of Hydrogen Energy

DOI

https://doi.org/10.1016/j.ijhydene.2020.10.086

Collections

Department of Chemical Engineering, Article

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Citation Formats

F. B. Oflaz and H. Koku, “Pilot-scale outdoor photofermentative hydrogen production from molasses using pH control,” International Journal of Hydrogen Energy, pp. 0–0, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/69571.