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dc.contributor.authorDessì P, Asunis F, Ravishankar H, Cocco FG, De Gioannis G, Muntoni A, Lens PNL
dc.contributor.authorDessì, Paolo
dc.contributor.authorAsunis, Fabiano
dc.contributor.authorRavishankar, Harish
dc.contributor.authorCocco, Francesco Giuseppe
dc.contributor.authorDe Gioannis, Giorgia
dc.contributor.authorMuntoni, Aldo
dc.contributor.authorLens, Piet N.L.
dc.identifier.citationDessì, Paolo, Asunis, Fabiano, Ravishankar, Harish, Cocco, Francesco Giuseppe, De Gioannis, Giorgia, Muntoni, Aldo, & Lens, Piet N. L. (2020). Fermentative hydrogen production from cheese whey with in-line, concentration gradient-driven butyric acid extraction. International Journal of Hydrogen Energy, 45(46), 24453-24466. doi:
dc.description.abstractHydrogen (H2) generation from cheese whey with simultaneous production and extraction of volatile fatty acids (VFAs) was studied in UASB reactors at two temperatures (20 and 35 °C) and pH values (5.0 and 4.5). The extraction module, installed through a recirculation loop, was a silicone tube coil submerged in water, which allows concentration-driven extraction of undissociated VFAs. Operating conditions were selected as a compromise for the recovery of both H2 and VFAs. Batch experiments showed a higher yield (0.9 mol H2 mol−1 glucoseeq.) at 35 °C and pH 5.0, regardless of the presence of the extraction module, whereas lower yields were obtained at pH 4.5 and 20 °C (0.5 and 0.3 mol H2 mol−1 glucoseeq., respectively). VFAs crossed the silicone membrane, with a strong preference for butyric over propionic and acetic acid due to its higher hydrophobicity. Sugars, lactic acid and nutrients were retained, resulting in an extracted solution of up to 2.5 g L−1 butyric acid with more than 90% purity. Continuous experiment confirmed those results, with production rates up to 2.0 L H2 L−1 d−1 and butyric acid extraction both in-line (from the UASB recirculation) and off-line (from the UASB effluent). In-line VFA extraction can reduce the operating costs of fermentation, facilitating downstream processing for the recovery of marketable VFAs without affecting the H2 production.en_IE
dc.description.sponsorshipThis work was funded by the Science Foundation of Ireland (SFI) Research Professorship Programme on Innovative Energy Technologies for Bioenergy, Biofuels and a Sustainable Irish Bioeconomy (IETSBIO3 , award 15/RP/2763). Fabiano Asunis gratefully acknowledges Sardinian Regional Government for the financial support of his PhD scholarship (P.O.R. Sardegna F.S.E. - Operational Programme of the Autonomous Region of Sardinia, European Social Fund 2014-2020 - Axis III Education and training, Thematic goal 10, Investment Priority 10ii), Specific goal 10.5.en_IE
dc.relation.ispartofInternational Journal Of Hydrogen Energyen
dc.subjectButyric aciden_IE
dc.subjectDairy wastewateren_IE
dc.subjectSelective extractionen_IE
dc.subjectWaste biorefineryen_IE
dc.titleFermentative hydrogen production from cheese whey with in-line, concentration gradient-driven butyric acid extractionen_IE
dc.contributor.funderScience Foundation Irelanden_IE
dc.contributor.funderSardinian Regional Governmenten_IE
dc.local.contactPaolo Dessi. Email:

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