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EnglishIn this study, thermal analysis in differential scanning calorimetry associated to Fourier self-deconvolution (FSD) of infrared spectra was applied to the study of anaerobic digestion of the organic fraction of domestic solid waste and sewage sludge mixed in 1:1 ratio under mesophilic and thermophilic conditions. Curves showed an exothermic peak in the high-temperature range and a number of endothermic and/or exothermic peaks in the low- and mediumtemperature range. The high-temperature exotherm was a common feature on curves of all samples. Digestates evidenced a shift of this exotherm toward higher temperature with respect to both substrates and feed-in materials as a result of a greater chemical complexity attained by organic matter (OM) during the process. A further shift toward higher temperature values was observed on digestates obtained under thermophilic conditions with respect to digestates obtained under mesophilic conditions. This result was associated to a higher recalcitrance of digestates produced under more drastic conditions. Based on evidence obtained by FSD spectra, the exotherm in the medium-temperature range was assigned to combustion of carbohydrates and to loss of aliphatic structures and carboxylic groups. Enthalpy data associated to the high-temperature exotherm were used to differentiate feed-in materials and their corresponding digestates and to distinguish digestates obtained under different operative conditions.
| Titolo: | Anaerobic digestion of municipal solid waste and sewage sludge under mesophilic and thermophilic conditions | |
| Autore/i: | M. R. Provenzano; D. Malerba; BUSCAROLI, ALESSANDRO; ZANNONI, DENIS; N. Senesi | |
| Autore/i Unibo: | ||
| Anno: | 2013 | |
| Rivista: | ||
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1007/s10973-012-2598-6 | |
| Abstract: | In this study, thermal analysis in differential scanning calorimetry associated to Fourier self-deconvolution (FSD) of infrared spectra was applied to the study of anaerobic digestion of the organic fraction of domestic solid waste and sewage sludge mixed in 1:1 ratio under mesophilic and thermophilic conditions. Curves showed an exothermic peak in the high-temperature range and a number of endothermic and/or exothermic peaks in the low- and mediumtemperature range. The high-temperature exotherm was a common feature on curves of all samples. Digestates evidenced a shift of this exotherm toward higher temperature with respect to both substrates and feed-in materials as a result of a greater chemical complexity attained by organic matter (OM) during the process. A further shift toward higher temperature values was observed on digestates obtained under thermophilic conditions with respect to digestates obtained under mesophilic conditions. This result was associated to a higher recalcitrance of digestates produced under more drastic conditions. Based on evidence obtained by FSD spectra, the exotherm in the medium-temperature range was assigned to combustion of carbohydrates and to loss of aliphatic structures and carboxylic groups. Enthalpy data associated to the high-temperature exotherm were used to differentiate feed-in materials and their corresponding digestates and to distinguish digestates obtained under different operative conditions. | |
| Data prodotto definitivo in UGOV: | 2013-05-31 | |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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http://hdl.handle.net/11585/127322
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