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Waste Management | 2014

An experimental study on fermentative H2 production from food waste as affected by pH

Giovanna Salvatorica Cappai; G. De Gioannis; Marco Friargiu; E Massi; Alessandra Muntoni; Alessandra Polettini; Raffaella Pomi; Daniela Spiga

Batch dark fermentation experiments were performed on food waste and mixtures of food waste and wastewater activated sludge to evaluate the influence of pH on biological H2 production and compare the process performance with and without inoculum addition. The effect of a preliminary thermal shock treatment of the inoculum was also investigated as a means to harvest the hydrogenogenic biomass. The best performance in terms of both H2 generation potential and process kinetics was observed at pH=6.5 under all experimental conditions (no inoculum, and untreated or thermally treated inoculum added). H2 production from food waste was found to be feasible even without inoculum addition, although thermal pre-treatment of the inoculum notably increased the maximum production and reduced the lag phase duration. The analysis of the fermentation products indicated that the biological hydrogen production could be mainly ascribed to a mixed acetate/butyrate-type fermentation. However, the presence of additional metabolites in the digestate, including propionate and ethanol, also indicated that other metabolic pathways were active during the process, reducing substrate conversion into hydrogen. The plateau in H2 generation was found to mirror the condition at which soluble carbohydrates were depleted. Beyond this condition, homoacetogenesis probably started to play a role in the degradation process.


International Journal of Hydrogen Energy | 2014

Biohydrogen production from dark fermentation of cheese whey: Influence of pH

G. De Gioannis; Marco Friargiu; E Massi; A. Muntoni; Alessandra Polettini; Raffaella Pomi; Daniela Spiga


Venice 2014 Fifth International Symposium on Energy from Biomass and Waste | 2014

Batch and semi-continuous anaerobic digestion of cheese whey for combined H2 and CH4 production

G De Gioannis; Marco Friargiu; E Massi; A. Muntoni; Alessandra Polettini; Raffaella Pomi; Daniela Spiga


EURASIA 2014 Waste Management Symposium | 2014

Effect of pH value on biohydrogen production from food waste

Giovanna Salvatorica Cappai; Giorgia De Gioannis; Marco Friargiu; E Massi; Aldo Muntoni; Alessandra Polettini; Raffaella Pomi; Daniela Spiga


Sardinia 2013 XIV International Waste Management and Landfill Symposium | 2013

Batch and semi-continuous hydrogen and methane production from food waste

Giovanna Salvatorica Cappai; G. De Gioannis; Marco Friargiu; E Massi; Aldo Muntoni; Alessandra Polettini; Raffaella Pomi; Daniela Spiga


Sardinia 2013 XIV International Waste Management and Landfill Symposium | 2013

Combined H2 and CH4 production from cheese whey

Giorgia De Gioannis; Marco Friargiu; E Massi; Aldo Muntoni; Alessandra Polettini; Raffaella Pomi; Daniela Spiga


First German-Italian Dialog 2012 | 2013

Fermentative hydrogen production form different organic residues

G. De Gioannis; Marco Friargiu; G Giordano; E Massi; Aldo Muntoni; Alessandra Polettini; Raffaella Pomi


Venice 2012 Fourth International Symposium on Energy from Biomass and Waste | 2012

Effects of pH value on biohydrogen production from cheese whey

G. De Gioannis; Marco Friargiu; E Massi; A. Muntoni; Alessandra Polettini; Raffaella Pomi


Venice 2012 Fourth International Symposium on Energy from Biomass and Waste | 2012

Fermentative hydrogen production from the organic fraction of municipal waste

Giorgia De Gioannis; Marco Friargiu; E Massi; Aldo Muntoni; Alessandra Polettini; Raffaella Pomi


SIDISA 2012 - Sustainable Technology for Environmental Protection” | 2012

Effect of pH and seed microorganisms on fermentative hydrogen production from food waste

Giovanna Salvatorica Cappai; G. De Gioannis; G Giordano; E Massi; A. Muntoni; Alessandra Polettini; Raffaella Pomi

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Raffaella Pomi

Sapienza University of Rome

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A. Muntoni

National Research Council

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