Abstract
Continuous hydrogen production stability and robustness by dark fermentation were comprehensively studied at laboratory scale. Continuous bioreactors were operated at two different hydraulic retention times (HRT) of 6 and 10 h. The reactors were subjected to feeding shocks given by decreases in the HRT, and therefore the organic loading increases, during 6 and 24 h. Results indicated that the H2 productivity was significantly improved by the temporary organic shock loads, increasing the hydrogen production rate up to 40%, compared to the rate obtained at the steady-state condition. Besides, it was observed that after the shock load, the stability of the reactor (measured as the hydrogen production rate) was recovered attaining the values observed before the feeding shocks. The bioreactor operated at shorter HRT (6 h) showed better H2 productivity (17.3 ± 1.1 L H2/L-d) in comparison with the other one operated at 10-h HRT (12.4 ± 1.6 L H2/L-d).
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Acknowledgements
The financial support granted by “Fondo de Sustentabilidad Energética SENER—CONACYT (Mexico)”, through the Project 247006 Gaseous Biofuels Cluster, is gratefully acknowledged. Isaac Monroy acknowledges the CONACYT Postdoctoral Scholarship [291113]. Péter Bakonyi acknowledges the support received from National Research, Development and Innovation Office (Hungary) under Grant No. PD 115640. We highly appreciate and acknowledge the technical support provided by M.Sc. Jaime Perez and Mr. José N. Rivera Campos, who generated the data from the reactors.
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Monroy, I., Bakonyi, P. & Buitrón, G. Temporary feeding shocks increase the productivity in a continuous biohydrogen-producing reactor. Clean Techn Environ Policy 20, 1581–1588 (2018). https://doi.org/10.1007/s10098-018-1555-x
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DOI: https://doi.org/10.1007/s10098-018-1555-x