Digestates obtained from a 1:1 mixture of the organic fraction of municipal solid waste and sewage sludge under mesophilic and thermophilic conditions evidenced a shift of the high temperature exotherm toward higher temperature with respect to feed-in material indicating stabilization attained by the OM during the process. A further shift of this exotherm toward higher temperature associated to lower enthalpy values were observed for thermophilic digestates with respect to mesophilic digestates. These results were explained by a major degradation of OM attained under stronger operative conditions. Lower enthalpy values were calculated for both mesophilic and thermophilic digestates with respect to feed-in mixtures. DSC applied to digestates obtained by energy crops, poultry manure, stomach residue and others agro-industrial residue sampled in different sections of the digestion plant showed a strong exotherm at lower temperature indicating lower thermal stability of the substrate. Lower enthalpy values of the high-temperature exotherm were calculated for digestates sampled from the storage tank, whereas higher H values were calculated for digestates retrieved from the second digester.

DIFFERENTIAL SCANNING CALORIMETRY APPLIED TO THE STUDY OF DIGESTATES OBTAINED FROM DIFFERENT ORGANIC SUBSTRATES

BUSCAROLI, ALESSANDRO;
2013

Abstract

Digestates obtained from a 1:1 mixture of the organic fraction of municipal solid waste and sewage sludge under mesophilic and thermophilic conditions evidenced a shift of the high temperature exotherm toward higher temperature with respect to feed-in material indicating stabilization attained by the OM during the process. A further shift of this exotherm toward higher temperature associated to lower enthalpy values were observed for thermophilic digestates with respect to mesophilic digestates. These results were explained by a major degradation of OM attained under stronger operative conditions. Lower enthalpy values were calculated for both mesophilic and thermophilic digestates with respect to feed-in mixtures. DSC applied to digestates obtained by energy crops, poultry manure, stomach residue and others agro-industrial residue sampled in different sections of the digestion plant showed a strong exotherm at lower temperature indicating lower thermal stability of the substrate. Lower enthalpy values of the high-temperature exotherm were calculated for digestates sampled from the storage tank, whereas higher H values were calculated for digestates retrieved from the second digester.
BCD2013 Abstracts
138
138
Provenzano M. R.; Malerba A. D.; Buscaroli A.; Fabbri C.; Senesi N.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/251882
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