Solid-liquid (S/L) separation of digestate (D) represents a simple technology able to produce two fractions having different composition. The aim of this work was to study the effect of S/L separation on dry matter (DM), nitrogen (TKN), phosphorus (P2O5) and heavy metals (HM) repartition into these two fractions and to characterize them. Therefore, thirteen full-scale digestion plants were studied and D, LF and SF were collected during three seasons of the year. Results obtained indicated that unexpectedly, on a mass balance, the liquid fraction still contains the majority of DM, i.e. 67% of the total of D. LF also contained 87% and 71% of TKN and P2O5respectively. HM contents were in line with typical NP-organic fertilizers. Chemical characterization suggested that the LF can be used as a substitute for mineral N fertilizers because of its high N content, while SF can be proposed as an NP-organic fertilizer.

Solid and liquid fractionation of digestate: Mass balance, chemical characterization, and agronomic and environmental value / F. Tambone, V. Orzi, G. D'Imporzano, F. Adani. - In: BIORESOURCE TECHNOLOGY. - ISSN 0960-8524. - 243(2017 Nov), pp. 1251-1256.

Solid and liquid fractionation of digestate: Mass balance, chemical characterization, and agronomic and environmental value

F. Tambone
;
V. Orzi;G. D'Imporzano;F. Adani
2017-11

Abstract

Solid-liquid (S/L) separation of digestate (D) represents a simple technology able to produce two fractions having different composition. The aim of this work was to study the effect of S/L separation on dry matter (DM), nitrogen (TKN), phosphorus (P2O5) and heavy metals (HM) repartition into these two fractions and to characterize them. Therefore, thirteen full-scale digestion plants were studied and D, LF and SF were collected during three seasons of the year. Results obtained indicated that unexpectedly, on a mass balance, the liquid fraction still contains the majority of DM, i.e. 67% of the total of D. LF also contained 87% and 71% of TKN and P2O5respectively. HM contents were in line with typical NP-organic fertilizers. Chemical characterization suggested that the LF can be used as a substitute for mineral N fertilizers because of its high N content, while SF can be proposed as an NP-organic fertilizer.
digestate; liquid fraction; mass balance; solid fraction; solid/liquid separation; agriculture; metals, heavy; fertilizers; nitrogen; phosphorus; bioengineering; environmental engineering; renewable energy, sustainability and the environment; waste management and disposal
Settore AGR/13 - Chimica Agraria
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/549347
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