The current study evaluated the quality of agricultural waste digestate by composting or co-composting with biogas feedstock (maize silage, food processing waste, or poultry litter). Temperature, phytotoxicity, C/N ratio, water extractable trace elements, and 14 enzyme activities were monitored. Temperature dropped earlier in digestate and maize silage co-composting pile, reducing time to maturity by 20 days. Composting and co-composting reduced phytotoxicity and C/N ratio, but increased immobilization of Al, Ba, Fe, Zn, and Mn at least by 40% in all piles. All the enzyme activities, except arylsulfatase and α-glucosidase, increased at the maturity phase and negatively correlated with organic matter content and most of trace elements. Post-digestate composting or co-composting with biogas feedstock is a promising strategy to improve digestate quality for fertilizer use, and selected enzyme activities can be indicators of compost maturity and immobilization of trace elements.

Post-digestate composting benefits and the role of enzyme activity to predict trace element immobilization and compost maturity / Biyensa, Gurmessa; Cocco, S.; Ashworth, J. A.; Foppa Pedretti, E.; Ilari, A.; Cardelli, V.; Fornasier, F.; Ruello, Maria Letizia; Corti, G.. - In: BIORESOURCE TECHNOLOGY. - ISSN 0960-8524. - ELETTRONICO. - 338:(2021). [10.1016/j.biortech.2021.125550]

Post-digestate composting benefits and the role of enzyme activity to predict trace element immobilization and compost maturity

Gurmessa Biyensa
Primo
;
Cocco S.;Foppa Pedretti E.;Ilari A.;Cardelli V.;Ruello Maria Letizia;Corti G.
Ultimo
2021-01-01

Abstract

The current study evaluated the quality of agricultural waste digestate by composting or co-composting with biogas feedstock (maize silage, food processing waste, or poultry litter). Temperature, phytotoxicity, C/N ratio, water extractable trace elements, and 14 enzyme activities were monitored. Temperature dropped earlier in digestate and maize silage co-composting pile, reducing time to maturity by 20 days. Composting and co-composting reduced phytotoxicity and C/N ratio, but increased immobilization of Al, Ba, Fe, Zn, and Mn at least by 40% in all piles. All the enzyme activities, except arylsulfatase and α-glucosidase, increased at the maturity phase and negatively correlated with organic matter content and most of trace elements. Post-digestate composting or co-composting with biogas feedstock is a promising strategy to improve digestate quality for fertilizer use, and selected enzyme activities can be indicators of compost maturity and immobilization of trace elements.
2021
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/295363
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