Temporary feeding shocks increase the productivity in a continuous biohydrogen-producing reactor

Monroy, Isaac and Bakonyi, Péter and Buitrón, Germán (2018) Temporary feeding shocks increase the productivity in a continuous biohydrogen-producing reactor. CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY, 20. pp. 1581-1588. ISSN 1618-954X (Unpublished)

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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 hours. The reactors were subjected to feeding shocks given by decreases in the HRT, and therefore the organic loading increase, during 6 and 24 hours. 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 to the other one operated at 10 h HRT (12.4 ± 1.6 L H2/L-d).

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