Abstract
This study evaluated the effect of hydraulic retention time (HRT) on the simultaneous hydrogen and ethanol production in two anaerobic fluidized bed reactors (55 °C) from mono-fermentation of cellulosic hydrolysate (AFBR-C) and the fermentation of glucose and xylose as co-substrates (AFBR-GX). In AFBR-C, the HRT was decreased from 24 to 8 h, while in AFBR-GX, the HRT was decreased from 16 to 0.5 h. The carbohydrate concentration was maintained at 4 g/L (AFBR-GX) and 2 g/L (AFBR-C). In AFBR-C, the main results observed by decreasing the HRT from 24 to 8 h were the increase in H2 yield (0.6–1.1 mol H2/mol hexose) and ethanol concentration (0.02–0.48 g/L). However, the H2 yield in AFBR-GX decreased from 0.4 to 0.1 mol H2/mol hexose by decreasing the HRT from 16 to 0.5 h. Additionally, the shortest HRTs applied to the AFBR-C (8 h) and AFBR-GX (0.5 h) resulted in the maximum hydrogen production rates of 115.7 and 279.9 mL H2/h L, the maximum energy yields of 7.4 and 47.7 kJ/h L, and EtOH molar fractions of 58.9 and 50.2%, respectively.
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This work was supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001, Conselho Nacional de Desenvolvimento Científico e Tecnológico—Brasil (CNPq) (process number 306455/2015-3), and Fundação de Amparo à Pesquisa do Estado de São Paulo—Brasil (FAPESP) (Grant No. 15/06246-7).
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Lopes, H.J.S., Ramos, L.R., de Menezes, C.A. et al. Simultaneous hydrogen and ethanol production in a thermophilic AFBR: a comparative approach between cellulosic hydrolysate single fermentation and the fermentation of glucose and xylose as co-substrates. Cellulose 27, 2599–2612 (2020). https://doi.org/10.1007/s10570-020-03000-4
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DOI: https://doi.org/10.1007/s10570-020-03000-4