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In this study, the co-digestion of food waste and activated sludge was evaluated in a two-stage anaerobic system and compared to the traditional single-stage process. The two-stage system was composed by two reactors connected in series able to perform the fermentative and the methanogenic phases separated. Experiments were carried out in semi-continuous mode under mesophilic conditions (37 °C). The two-stage technology achieved an overall improvement of the anaerobic performances. Results highlighted an increase in biogas production and volatile solids degradation of 26% and 9%, respectively. Considering the whole two-stage system, i.e. the sum of the biogas productions of the first and the second digester, these percentages increased up to 35.0%. Concerning gas quality, the two-stage system achieved a hydrogen rich biogas in the first fermentative reactor and an improvement of methane content in the second methanogenic digester. The average methane content shifted from 61.2% to 70.1%. The highest methane production of the two-stage process was due to improved substrate hydrolysis, with increased amounts of volatile fatty acids made readily available in the second stage.
F. Baldi; I. Pecorini; R. Iannelli. Comparison of single-stage and two-stage anaerobic co-digestion of food waste and activated sludge for hydrogen and methane production. Renewable Energy 2019, 143, 1755 -1765.
AMA StyleF. Baldi, I. Pecorini, R. Iannelli. Comparison of single-stage and two-stage anaerobic co-digestion of food waste and activated sludge for hydrogen and methane production. Renewable Energy. 2019; 143 ():1755-1765.
Chicago/Turabian StyleF. Baldi; I. Pecorini; R. Iannelli. 2019. "Comparison of single-stage and two-stage anaerobic co-digestion of food waste and activated sludge for hydrogen and methane production." Renewable Energy 143, no. : 1755-1765.
Three different experimental sets of runs involving batch fermentation assays were performed to evaluate the influence of the experimental conditions on biological hydrogen production from the source-separated organic fraction of municipal solid waste collected through a door-to-door system. The fermentation process was operated with and without automatic pH control, at a pH of 5.5 and 6.5, food-to-microorganism ratios of 1/3 and 1/1 (wet weight basis) and with different working volumes (0.5 and 3 L). The experimental results showed that the pH control strategy and the reactor volume did not affect the final hydrogen production yield but played an important role in determining the time evolution of the process. Indeed, although the different experimental conditions tested yielded comparable hydrogen productions (with maximum average values ranging from 68.5 to 88.5 NLH2 (kgTVSOF)−1), the automatic pH control strategy improved the process from the kinetic viewpoint resulting in a t95 reduction from an average of 34.9 h without automatic pH control to an average of 19.5 h.
Francesco Baldi; Renato Iannelli; Isabella Pecorini; Alessandra Polettini; Raffaella Pomi; Andreina Rossi. Influence of the pH control strategy and reactor volume on batch fermentative hydrogen production from the organic fraction of municipal solid waste. Waste Management & Research: The Journal for a Sustainable Circular Economy 2019, 37, 478 -485.
AMA StyleFrancesco Baldi, Renato Iannelli, Isabella Pecorini, Alessandra Polettini, Raffaella Pomi, Andreina Rossi. Influence of the pH control strategy and reactor volume on batch fermentative hydrogen production from the organic fraction of municipal solid waste. Waste Management & Research: The Journal for a Sustainable Circular Economy. 2019; 37 (5):478-485.
Chicago/Turabian StyleFrancesco Baldi; Renato Iannelli; Isabella Pecorini; Alessandra Polettini; Raffaella Pomi; Andreina Rossi. 2019. "Influence of the pH control strategy and reactor volume on batch fermentative hydrogen production from the organic fraction of municipal solid waste." Waste Management & Research: The Journal for a Sustainable Circular Economy 37, no. 5: 478-485.
Four inocula collected from different operating facilities were tested in their hydrogenic performances by means of two biochemical hydrogen potential test set-ups using sucrose and food waste as substrates, with the aim of evaluating the influence of inoculum media in batch fermentative assays. The selected inocula were: activated sludge collected from the aerobic unit of a municipal wastewater treatment plant, digested sludge from an anaerobic reactor treating organic waste and cattle manure, digested sludge from an anaerobic reactor treating agroindustrial residues, and digested sludge from an anaerobic reactor of a municipal wastewater treatment plant. Test results, in terms of specific hydrogen production, hydrogen conversion efficiency, and volatile solids removal efficiency, were significantly dependent on the type of inoculum. Statistical analysis showed different results, indicating that findings were due to the different inocula used in the tests. In particular, assays performed with activated sludge showed the highest performances for both substrates and both experimental set-ups.
Isabella Pecorini; Francesco Baldi; Renato Iannelli. Biochemical Hydrogen Potential Tests Using Different Inocula. Sustainability 2019, 11, 622 .
AMA StyleIsabella Pecorini, Francesco Baldi, Renato Iannelli. Biochemical Hydrogen Potential Tests Using Different Inocula. Sustainability. 2019; 11 (3):622.
Chicago/Turabian StyleIsabella Pecorini; Francesco Baldi; Renato Iannelli. 2019. "Biochemical Hydrogen Potential Tests Using Different Inocula." Sustainability 11, no. 3: 622.
Isabella Pecorini; Lorenzo Ferrari; Francesco Baldi; Elena Albini; Giovanni Galoppi; Donata Bacchi; Francesco Vizza; Lidia Lombardi; Carlo Carcasci; Giovanni Ferrara; Ennio Antonio Carnevale. Energy recovery from fermentative biohydrogen production of biowaste: a case study based analysis. Energy Procedia 2017, 126, 605 -612.
AMA StyleIsabella Pecorini, Lorenzo Ferrari, Francesco Baldi, Elena Albini, Giovanni Galoppi, Donata Bacchi, Francesco Vizza, Lidia Lombardi, Carlo Carcasci, Giovanni Ferrara, Ennio Antonio Carnevale. Energy recovery from fermentative biohydrogen production of biowaste: a case study based analysis. Energy Procedia. 2017; 126 ():605-612.
Chicago/Turabian StyleIsabella Pecorini; Lorenzo Ferrari; Francesco Baldi; Elena Albini; Giovanni Galoppi; Donata Bacchi; Francesco Vizza; Lidia Lombardi; Carlo Carcasci; Giovanni Ferrara; Ennio Antonio Carnevale. 2017. "Energy recovery from fermentative biohydrogen production of biowaste: a case study based analysis." Energy Procedia 126, no. : 605-612.