Data di Pubblicazione:
2019
Citazione:
Measuring the organic amendment properties of the liquid fraction of digestate / F. Tambone, V. Orzi, M. Zilio, F. Adani. - In: WASTE MANAGEMENT. - ISSN 0956-053X. - 88(2019 Apr 01), pp. 21-27. [10.1016/j.wasman.2019.03.024]
Abstract:
The liquid fraction (LF) of digestate has usually been proposed as a substitute for mineral fertilizers
because of the presence of high N content, above all in easily available form (ammonia). The LF was
reported to contain about 66% of dry matter from the digestate. This study reports the characterization
of the organic carbon (OC) contained in the LF of digestates obtained from full scale plants by screwpress
solid/liquid separation, to find out about their organic amendment properties. Results indicate that
LF contains stable OC because of the concentration during anaerobic digestion of recalcitrant molecules,
and that its biological stability, measured by oxygen uptake rate, was similar to that of compost, i.e.
40 ± 15 mg O2 g DM1 20 h1 and 41.1 ± 5.1 mg O2 g DM1 20 h1. 13C NMR indicated that LFs were similar
each other and were constituted of recalcitrant Alkyl-C (34.82 ± 5.28% OC) derived from plant and
fecal material, Aromatic-C (11.10 ± 2.2% OC) derived from lignin-like structures and O/N-alkyl
(44.91 ± 4.87% OC) derived from cellulose/hemicelluloses and protein material. A simple simulation of
the real C dosed by using LF as N-fertilizers indicated that amendment properties cannot be ignored.
All these results seem to indicate good amendment properties for LFs, contrary to the common opinion.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Biological stability; CPMAS 13C NMR; Digestate; Liquid fraction of digestate; Soil organic carbon
Elenco autori:
F. Tambone, V. Orzi, M. Zilio, F. Adani
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