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Article

Evaluation of MSW Compost and Digestate Mixtures for a Circular Economy Application

1
DESTEC—Department of Energy, Systems, Territory and Construction Engineering, University of Pisa, 56122 Pisa, Italy
2
Research Institute on Terrestrial Ecosystems (CNR-IRET), National Research Council of Italy, 56124 Pisa, Italy
3
DIEF—Department of Industrial Engineering, University of Florence, 50139 Florence, Italy
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(7), 3042; https://doi.org/10.3390/su12073042
Received: 13 March 2020 / Revised: 3 April 2020 / Accepted: 7 April 2020 / Published: 10 April 2020
(This article belongs to the Special Issue Municipal Solid Waste Management in a Circular Economy)
In order to obtain a product with agronomic characteristics and biological stability consistent with the EU fertilizer decree for the market of EU fertilising products three different mixtures obtained from sludge digestate from municipal wastewater treatment plant, fresh compost and mature compost have been studied and characterized. For the experimental activity, the raw samples and three mixing ones were collected for the analytical characterization. The biological stability was then assessed for all samples using different stability criteria such as Specific Oxygen Uptake Rate, Rottegrad self-heating factor, Residual biogas potential. Specific enzymatic tests provided information about the status of nutrient cycles (C, P and S) and to overall microbial activity. Physical (bulk density, particle density, air capacity and water content), nutritional (C, N, P, K, Mg, and Ca) and toxicological properties (seedling growth tests on Lepidum sativum L., Cucumis sativus L., Lolium perenne L.) were also evaluated in order to assess the feasibility of agronomic use of the digestate-based mixtures. All the digestate-based mixtures responded to the main characteristics of compost quality requirements proposed in national and international regulations. The evidence found in this study highlighted that the strategy of mixing of sludge digestates with the composts allowed to mitigate the environmental risk posed by each starting material and to valorize their nutrient content. View Full-Text
Keywords: digestate; anaerobic digestion; compost; sludge; amendment properties; stability indexes digestate; anaerobic digestion; compost; sludge; amendment properties; stability indexes
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MDPI and ACS Style

Pecorini, I.; Peruzzi, E.; Albini, E.; Doni, S.; Macci, C.; Masciandaro, G.; Iannelli, R. Evaluation of MSW Compost and Digestate Mixtures for a Circular Economy Application. Sustainability 2020, 12, 3042. https://doi.org/10.3390/su12073042

AMA Style

Pecorini I, Peruzzi E, Albini E, Doni S, Macci C, Masciandaro G, Iannelli R. Evaluation of MSW Compost and Digestate Mixtures for a Circular Economy Application. Sustainability. 2020; 12(7):3042. https://doi.org/10.3390/su12073042

Chicago/Turabian Style

Pecorini, Isabella, Eleonora Peruzzi, Elena Albini, Serena Doni, Cristina Macci, Grazia Masciandaro, and Renato Iannelli. 2020. "Evaluation of MSW Compost and Digestate Mixtures for a Circular Economy Application" Sustainability 12, no. 7: 3042. https://doi.org/10.3390/su12073042

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