LAPSE:2020.0364
Published Article
LAPSE:2020.0364
Ultra-Pure Hydrogen via Co-Valorization of Olive Mill Wastewater and Bioethanol in Pd-Membrane Reactors
David Alique, Giacomo Bruni, Raúl Sanz, José Antonio Calles, Silvano Tosti
April 14, 2020
Olive mill wastewater (OMW) presents high environmental impact due to the fact of its elevated organic load and toxicity, especially in Mediterranean countries. Its valorization for simultaneous pollutants degradation and green energy production is receiving great attention, mainly via steam reforming for hydrogen generation. Following previous works, the present research goes into detail about OMW valorization, particularly investigating for the first time the potential benefits of OMW−bioethanol mixtures co-reforming for ultra-pure hydrogen production in Pd-membrane reactors. In this manner, the typical large dilution of OMW and, hence, excess water can be used as a reactant for obtaining additional hydrogen from ethanol. Fresh OMW was previously conditioned by filtration and distillation processes, analyzing later the effect of pressure (1−5 bar), oxidizing conditions (N2 or air as carrier gas), gas hourly space velocity (150−1500 h−1), and alcohol concentration on the co-reforming process (5−10% v/v). In all cases, the exploitation of OMW as a source of environmentally friendly hydrogen was demonstrated, obtaining up to 30 NmL·min−1 of pure H2 at the most favorable experimental conditions. In the membrane reactor, higher pressures up to 5 bar promoted both total H2 production and pure H2 recovery due to the increase in the permeate flux despite the negative effect on reforming thermodynamics. The increase of ethanol concentration also provoked a positive effect, although not in a proportional relation. Thus, a greater effect was obtained for the increase from 5% to 7.5% v/v in comparison to the additional improvement up to 10% v/v. On the contrary, the use of oxidative conditions slightly decreased the hydrogen production rate, while the effect of gas hourly space velocity needs to be carefully analyzed due to the contrary effect on potential total H2 generation and pure H2 recovery.
Keywords
bioethanol, Hydrogen, membrane reactor, olive mill wastewater, palladium membrane, Steam Reforming
Suggested Citation
Alique D, Bruni G, Sanz R, Calles JA, Tosti S. Ultra-Pure Hydrogen via Co-Valorization of Olive Mill Wastewater and Bioethanol in Pd-Membrane Reactors. (2020). LAPSE:2020.0364
Author Affiliations
Alique D: Department of Chemical, Energy and Mechanical Technology, Rey Juan Carlos University, C/Tulipán s/n, 28933 Móstoles, Spain; ENEA, FSN Department, C.R. Frascati, Via E. Fermi 45, I-00044 Frascati (RM), Italy [ORCID]
Bruni G: ENEA-DUEE-SPS, Energy Efficiency Department, C.R. Casaccia, Via Anguillarese 301, I-00123 Roma (RM), Italy [ORCID]
Sanz R: Department of Chemical and Environmental Technology, Rey Juan Carlos University, C/Tulipán s/n, 28933 Móstoles, Spain
Calles JA: Department of Chemical, Energy and Mechanical Technology, Rey Juan Carlos University, C/Tulipán s/n, 28933 Móstoles, Spain [ORCID]
Tosti S: ENEA, FSN Department, C.R. Frascati, Via E. Fermi 45, I-00044 Frascati (RM), Italy
Journal Name
Processes
Volume
8
Issue
2
Article Number
E219
Year
2020
Publication Date
2020-02-13
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr8020219, Publication Type: Journal Article
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LAPSE:2020.0364
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doi:10.3390/pr8020219
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Apr 14, 2020
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