Anaerobic fluidized bed reactor with expanded clay as support for hydrogen production through dark fermentation of glucose |
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Authors: | Eduardo Lucena Cavalcante de Amorim,Aruana Rocha Barros,Má rcia Helena Rissato Zamariolli Damianovic,Edson Luiz Silva |
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Affiliation: | 1. Department of Hydraulic and Sanitation, University of São Paulo. Av. Trabalhador Sãocarlense, 400 Centro, CEP 13566-590 São Carlos, SP, Brazil;2. Department of Chemical Engineering, Federal University of São Carlos, Rodovia Washington Luis, km 235, CEP 13565-905 São Carlos, SP, Brazil |
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Abstract: | This study evaluated hydrogen production in an anaerobic fluidized bed reactor (AFBR) fed with glucose-based synthetic wastewater. Particles of expanded clay (2.8–3.35 mm) were used as a support material for biomass immobilization. The reactor was operated with hydraulic retention times (HRT) ranging from 8 to 1 h. The hydrogen yield production increased from 1.41 to 2.49 mol H2 mol−1 glucose as HRT decreased from 8 to 2 h. However, when HRT was 1 h, there was a slight decrease to 2.41 mol H2 mol−1 glucose. The biogas produced was composed of H2 and CO2, and the H2 content increased from 8% to 35% as HRT decreased. The major soluble metabolites during H2 fermentation were acetic acid (HAc) and butyric acid (HBu), accounting for 36.1–53.3% and 37.7–44.9% of total soluble metabolites, respectively. Overall, the results demonstrate the potential of using expanded clay as support material for hydrogen production in AFBRs. |
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Keywords: | Anaerobic fluidized bed reactor Biofilm Dark fermentation Expanded clay Hydrogen production |
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