Qualitative Characterization and Differentiation of Digestates from Different Biowastes Using FTIR and
88
Fluorescence Spectroscopies
Figure 8. Comparison between synchronous-scan spectra of
D4 and its corresponding biomasse: (a) Olive mill wastewa-
ters; (b) D4; (c) Sorghum silage; (d) Olive residues; (e)
Agro-industrial residues.
“inherit” the main fluorescence peaks and consequently
the main chemical characteristics of the organic wastes
from which they are produced.
4. Conclusions
FTIR and fluorescence spectroscopies are simple and
reliable tools which succeeded in qualitatively character-
izing and differentiating digestates obtained from bio-
masses of different chemical composition. Results pro-
vided evidence of peculiar characteristic related to the
chemical composition of biomasses from which they are
produced. Similar FTIR and fluorescence spectra were
found for digestates obtained loading into the digestion
plant organic mixtures with a quite constant composition.
During the olive oil season, digestates revealed the pres-
ence of characteristic features deriving from olive oil
production wastes. On the basis of our evidence we con-
cluded that digestates produced in a full-scale co-digestion
plant “inherit” the main chemical character of the organic
wastes from which they are produced.
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