Digestate represents a precious by-product in particular in agriculture, however its impact on the environment and human health is still unexplored. In this work, the toxicity of a pig slurry digestate was assessed through 7 ecotoxicity tests and considering 10 different endpoints. Besides, a synthetic index was applied to the outputs of the battery of tests for the environmental risk assessment, in order to evaluate the opportunity to use directly this kind of digestate in agriculture or to introduce an additional treatment. All the organisms were sensitive to digestate toxicity (EC50 ranged from 14.22% for Cucumis sativum to 0.77% for Raphidocelis subcapitata). The physical-chemical features at the base of this toxicity seem to be the high content of ammonium, salinity, COD, phosphate and colour. The synthetic index showed that the digestate was very toxic and associated to an extremely high environmental risk. Thus a pre-treatment is needed to reduce its toxicity and environmental impact, whatever could be its exploitation.

Is digestate safe? A study on its ecotoxicity and environmental risk on a pig manure

TIGINI, Valeria;FRANCHINO, MARTA;BONA, Francesca;VARESE, Giovanna, Cristina
Last
2016

Abstract

Digestate represents a precious by-product in particular in agriculture, however its impact on the environment and human health is still unexplored. In this work, the toxicity of a pig slurry digestate was assessed through 7 ecotoxicity tests and considering 10 different endpoints. Besides, a synthetic index was applied to the outputs of the battery of tests for the environmental risk assessment, in order to evaluate the opportunity to use directly this kind of digestate in agriculture or to introduce an additional treatment. All the organisms were sensitive to digestate toxicity (EC50 ranged from 14.22% for Cucumis sativum to 0.77% for Raphidocelis subcapitata). The physical-chemical features at the base of this toxicity seem to be the high content of ammonium, salinity, COD, phosphate and colour. The synthetic index showed that the digestate was very toxic and associated to an extremely high environmental risk. Thus a pre-treatment is needed to reduce its toxicity and environmental impact, whatever could be its exploitation.
551-552
127
132
www.elsevier.com/locate/scitotenv
Algae; Anaerobic digestion; Bacteria; Bioassays; Crustaceans; Phytotoxicity; Environmental Chemistry; Pollution; Waste Management and Disposal; Environmental Engineering
Tigini, Valeria; Franchino, Marta; Bona, Francesca; Varese, Giovanna, Cristina
File in questo prodotto:
File Dimensione Formato  
Tigini et al 2015.pdf

Accesso aperto

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 285.21 kB
Formato Adobe PDF
285.21 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/1557828
Citazioni
  • ???jsp.display-item.citation.pmc??? 1
  • Scopus 68
  • ???jsp.display-item.citation.isi??? 61
social impact