Hydrogen production from food wastes and gas post-treatment by CO2 adsorption
| Autor: | J.J. Pis, Xiomar Gómez, Susana Garcia, Covadonga Pevida, Antonio Morán, Vanesa Redondas, Fernando Rubiera |
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| Rok vydání: | 2012 |
| Předmět: |
Hydraulic retention time
Chemistry Dark fermentation Carbon Dioxide Garbage Type (model theory) Methane chemistry.chemical_compound Bioreactors Adsorption Chemical engineering Fermentation medicine Organic chemistry Energy source Waste Management and Disposal Hydrogen Activated carbon medicine.drug Hydrogen production |
| Zdroj: | Waste Management. 32:60-66 |
| ISSN: | 0956-053X |
| DOI: | 10.1016/j.wasman.2011.09.003 |
| Popis: | Highlights: Black-Right-Pointing-Pointer The dark fermentation process of food wastes was studied over an extended period. Black-Right-Pointing-Pointer Decreasing the HRT of the process negatively affected the specific gas production. Black-Right-Pointing-Pointer Adsorption of CO{sub 2} was successfully attained using a biomass type activated carbon. Black-Right-Pointing-Pointer H{sub 2} concentration in the range of 85-95% was obtained for the treated gas-stream. - Abstract: The production of H{sub 2} 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 H{sub 2} streams appropriate for industrial application. This research work evaluates the dark fermentation of food wastes and assesses the possibility of adsorbing CO{sub 2} 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 H{sub 2} 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 effectmore » on the conversion of the substrate into soluble products. This resulted in a lower amount of soluble substrate being available for metabolisation by H{sub 2} producing microflora leading to a reduction in specific H{sub 2} production. Adsorption of CO{sub 2} 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 H{sub 2}S onto the activated carbon also took place, there being no evidence of H{sub 2}S present in the bio-H{sub 2} exiting the column. Nevertheless, the concentration of H{sub 2}S was very low, and this co-adsorption did not affect the CO{sub 2} capture capacity of the activated carbon.« less |
| Databáze: | OpenAIRE |
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