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Water, Air, & Soil Pollution

, 225:2046 | Cite as

Agricultural Reuse of the Digestate from Anaerobic Co-Digestion of Organic Waste: Microbiological Contamination, Metal Hazards and Fertilizing Performance

  • Silvia Bonetta
  • Sara Bonetta
  • Elisa Ferretti
  • Giorgio Fezia
  • Giorgio Gilli
  • Elisabetta CarraroEmail author
Article

Abstract

The aim of this study was to evaluate the agricultural reuse of the digestate products (DPs) obtained from mesophilic anaerobic co-digestion of different organic wastes (sludge, cattle slurries and organic fraction of municipal solid wastes). At this scope, the content of faecal indicators and pathogens as well as the heavy metal concentration of DPs was monitored. The fertilizing performance of the DPs was also investigated. Co-digestion trials were performed using laboratory-scale (LRs) and pilot-scale reactors (PRs). The microbiological analysis of DPs showed the common presence of Salmonella and an inadequate reduction of indicator organisms during the digestion process, both in the LRs and the PRs. Moreover, the presence of pathogens (e.g. Listeria monocytogenes) in some DP samples highlighted the importance of the microbiological quality evaluation of the DPs to study the possible health risks for consumer. In several samples of DPs, the Cu, Ni and Zn contents exceeded the maximum admissible concentration for fertilizer, as specified by Italian law, suggesting possible environmental contamination if the DPs are used for agricultural purposes. Considering the fertilizing performance, significant differences of growth parameters were observed only for the DPs that were produced by LRs. In conclusion, this work can be considered as a preliminary study to evaluate the possible agricultural reuse of the digestate obtained from different organic wastes.

Keywords

Anaerobic co-digestion Agricultural reuse Fertilizer Faecal indicator bacteria Pathogenic bacteria Heavy metals 

Notes

Acknowledgments

The authors wish to thank the Piedmont Region for funding. This work is a portion of a larger project referred to as Digested Energy, which was envisioned in response to the 2006 call for Pre-competitive Development and Industrial Research. This funding scheme was promoted by the Piedmont Region with European Community resources. Finally, the authors thank the numerous collaborators employed in each of the involved institutions: Università degli Studi di Torino, Politecnico di Torino, SMAT S.p.A., AMIAT S.p.A., Ansaldo FC S.p.A., Acsel Susa S.p.A., VM-press s.r.l., Federsviluppo, E.R.A.P.R.A. Piemonte and Università degli Studi del Piemonte Orientale “A. Avogadro”.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Silvia Bonetta
    • 1
  • Sara Bonetta
    • 2
  • Elisa Ferretti
    • 1
  • Giorgio Fezia
    • 3
  • Giorgio Gilli
    • 2
  • Elisabetta Carraro
    • 2
    Email author
  1. 1.Dipartimento di Scienze ed Innovazione Tecnologica (DiSIT)Università del Piemonte Orientale “A. Avogadro”AlessandriaItaly
  2. 2.Dipartimento di Scienze della Sanità Pubblica e PediatricheUniversità di TorinoTorinoItaly
  3. 3.Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d’AostaAlessandriaItaly

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