Photofermentative hydrogen production from molasses: Scale-up and outdoor operation at low carbon-to-nitrogen ratio

Date

2018-06-28

Author

Savasturk, Dilan
Kayahan, Emine
Koku, Harun

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Photofermentative hydrogen production was carried out under outdoor conditions with a Rhodobacter capsulatus strain on molasses, a renewable and sustainable feedstock. An existing photobioreactor design was scaled-up from 9 L to 20 L. The decreased carbon-to nitrogen (C/N) ratio of 13.0, compared to our previous work, accelerated growth and resulted in a reduced lag period for hydrogen production as well as higher productivities in the exponential phase. However, the low C/N ratio also promoted a high optical density due to growth, limiting light transmission. Still, the maximum productivity was found as 0.47 mol H-2/(m(3).h), significantly higher than our result with the smaller reactor volume. High rates of production could not be maintained presumably due to the combined effects of cloudy periods, the aforementioned C/N ratio and decreasing pH. These results suggest that the scale-up was successful and there is potential for further improvement using optimal C/N ratio and cell concentration values. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Subject Keywords

Photofermentation, Rhodobacter capsulatus, Molasses, Carbon-to-nitrogen ratio, Scale-up, Outdoor

URI

https://hdl.handle.net/11511/38424

Journal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

DOI

https://doi.org/10.1016/j.ijhydene.2018.01.014

Collections

Department of Chemical Engineering, Article

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Citation Formats

D. Savasturk, E. Kayahan, and H. Koku, “Photofermentative hydrogen production from molasses: Scale-up and outdoor operation at low carbon-to-nitrogen ratio,” INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, pp. 11676–11687, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38424.