Produção de hidrogênio a partir da manipueira em reator anaeróbio de leito fluidificado sob condições termofílicas

Abstract

In an attempt to obtain better yields and higher volumetric production of hydrogen, researches have reported factors that can cause an extender in the production of fermentative hydrogen, the temperature is one, and recent research has demonstrated an increase in the production of fermentative hydrogen by increasing temperature. Thus, the objective of this work was the production of hydrogen at thermophilic temperatures from cassava as a carbon source in anaerobic fluidized bed reactor (RALF). The support material for the adhesion of biomass was expanded clay (2.8 to 3.35 mm). The adhesion of the biomass was performed with expanded clay. The departure of the reactor was started with an 8 h hydraulic retention time (HRT), through a 6 h HRT, 4 h and ending with 2 h HRT. After it reaches a 2 h HRT, the organic loading rate was maintained at a constant influent COD of 4000 mg L-1. Then, from this point it was evaluated the effect of temperature on the thermophilic hydrogen production. The reactor was operated under different temperatures: 45°C, 55°C, 65°C. In this study, we observed a minimum return of 1.24 mol H2.mol glucose-1 at 65°C. Moreover, it can be seen that increasing temperature of 45-55 °C was obtained a maximum yield of 1.66 mol H2.mol glucose-1 . It was noticed the presence of the following metabolites liquids: acetic acid as the primary metabolite in the production of hydrogen.