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Hydrogen production from food wastes and gas post-treatment by CO2 adsorption
Authors:Redondas V  Gómez X  García S  Pevida C  Rubiera F  Morán A  Pis J J
Institution:a Chemical Engineering Department, University of Leon, IRENA-ESTIA, Avda. de Portugal 41, Leon 24071, Spain
b Instituto Nacional del Carbón, CSIC, Apartado 73, 33080 Oviedo, Spain
Abstract:The production of H2 by biological means, although still far from being a commercially viable proposition, offers great promise for the future. Purification of the biogas obtained may lead to the production of highly concentrated H2 streams appropriate for industrial application. This research work evaluates the dark fermentation of food wastes and assesses the possibility of adsorbing CO2 from the gas stream by means of a low cost biomass-based adsorbent. The reactor used was a completely stirred tank reactor run at different hydraulic retention times (HRTs) while the concentration of solids of the feeding stream was kept constant. The results obtained demonstrate that the H2 yields from the fermentation of food wastes were affected by modifications in the hydraulic retention time (HRT) due to incomplete hydrolysis. The decrease in the duration of fermentation had a negative effect on the conversion of the substrate into soluble products. This resulted in a lower amount of soluble substrate being available for metabolisation by H2 producing microflora leading to a reduction in specific H2 production.Adsorption of CO2 from a gas stream generated from the dark fermentation process was successfully carried out. The data obtained demonstrate that the column filled with biomass-derived activated carbon resulted in a high degree of hydrogen purification. Co-adsorption of H2S onto the activated carbon also took place, there being no evidence of H2S present in the bio-H2 exiting the column. Nevertheless, the concentration of H2S was very low, and this co-adsorption did not affect the CO2 capture capacity of the activated carbon.
Keywords:Biological hydrogen  Dark fermentation  CO2 capture  Adsorption
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