Hydrogen production from food wastes and gas post-treatment by CO2 adsorption

V. Redondas, X. Gomez, Susana Garcia, C. Pevida, F. Rubiera, A. Moran, J. J. Pis

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32 Citations (Scopus)

Abstract

The production of H-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-2 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 H-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 effect on the conversion of the substrate into soluble products. This resulted in a lower amount of soluble substrate being available for metabolisation by H-2 producing microflora leading to a reduction in specific H-2 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-H-2 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. (C) 2011 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)60-66
Number of pages7
JournalWaste Management
Volume32
Issue number1
DOIs
Publication statusPublished - Jan 2012

Keywords

  • Biological hydrogen
  • Dark fermentation
  • CO2 capture
  • Adsorption
  • HYDRAULIC RETENTION TIME
  • ACTIVATED CARBONS
  • BIOHYDROGEN PRODUCTION
  • SUBSTRATE CONCENTRATION
  • SWING ADSORPTION
  • FERMENTATION
  • CAPTURE
  • MEMBRANE
  • SEPARATION
  • CAPACITY

Cite this

Redondas, V., Gomez, X., Garcia, S., Pevida, C., Rubiera, F., Moran, A., & Pis, J. J. (2012). Hydrogen production from food wastes and gas post-treatment by CO2 adsorption. Waste Management, 32(1), 60-66. https://doi.org/10.1016/j.wasman.2011.09.003