Assessing amendment properties of digestate by studying the organic matter composition and the degree of biological stability during the anaerobic digestion of the organic fraction of MSW
2009
Tambone, Fulvia | Genevini, Pierluigi | D'Imporzano, Giuliana | Adani, Fabrizio
The transformation of organic matter during anaerobic digestion of mixtures of energetic crops, cow slurry, agro-industrial waste and organic fraction of municipal solid waste (OFMSW) was studied by analysing different samples at diverse points during the anaerobic digestion process in a full-scale plant. Both chemical (fiber analysis) and spectroscopic approaches (¹³C CPMAS NMR) indicated the anaerobic digestion process proceeded by degradation of more labile fraction (e.g. carbohydrate-like molecules) and concentration of more recalcitrant molecules (lignin and non-hydrolysable lipids). These modifications determined a higher degree of biological stability of digestate with respect to the starting mixture, as suggested, also, by the good correlations found between the cumulative oxygen uptake (OD₂₀), and the sum of (cellulose+hemicellulose+cell soluble) contents of biomasses detected by fiber analysis (r =0.99; P <0.05), and both O-alkyl-C (r =0.98; P <0.05) and alkyl-C (r =-0.99; P <0.05) measured by ¹³C CPMAS NMR.
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