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Landfarming as a sustainable management strategy for fresh and phytoremediated sediment

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Abstract

The aim of this study was to evaluate the effectiveness of a landfarming process (LP) in recovering sediments at different biodegradation phases: phytoremediated dredged sediments (PDS) and fresh dredged sediments (FDS). The PDS landfarming was applied to (1) reduce residual contamination and (2) improve the biological activities in order to obtain a decontaminated matrix rich in organic matter and enzymatic activity to be reused as agronomic substrate. In 3 months of LP, a microbial activity stimulation (from 7 to 48%) and a decrease in organic contamination (about 15%) were recorded. In addition, no phytotoxicity and the content in total organic carbon and nitrogen make the sediments suitable to be reused in agriculture. The FDS landfarming was carried out to (1) reduce water content, (2) transform the organic matter into a more stable form, and (3) decrease organic contaminant level. Five months of LP led to a considerable reduction in water content (40%) and to the activation of microbial biomass metabolism (from 4 to 50 times higher), which achieved proper mineralization of organic matter and contaminants (polycyclic aromatic hydrocarbons near to zero and a total petroleum hydrocarbon reduction of about 60%). The LP also enhanced the stoichiometric ratios of nutrients and enzymes. In conclusion, the LP was a promising and economical methodology to improve the physical, chemical, and biological properties of polluted sediments at different biodegradation phases, creating a substrate ready for several environmental applications. Notably, the PDS resulted appropriate for agricultural use and FDS for civil applications.

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All data generated or analyzed during this study are included in this published article (and its supplementary information files).

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Acknowledgments

The present study was done in the framework of the EU project “Innovative integrated methodology for the use of decontaminated river sediments in plant nursing and in road construction” CLEANSED (LIFE12 ENV/IT/000652). We would like to thank Fernando Di Giovanni and Manuele Scatena for their technical support.

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Conceptualization: C.M., E.P., and S.D.; methodology: C.M., E.P., and S.D.; software: E.P. and F.V.; validation: C.M., E.P., S.D., F.V., and G.M.; formal analysis: C.M. and E.P.; investigation: C.M. and S.D.; resources: C.M., S.D., and G.M.; data curation: E.P. and F.V.; writing—original draft preparation: C.M., E.P., and F.V.; writing—review and editing: C.M., E.P., S.D., F.V., and G.M.; visualization: C.M., E.P., and F.V.; supervision: C.M. and G.M.; project administration: C.M., S.D., and G.M.; funding acquisition: C.M., E.P., S.D., and G.M.

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Correspondence to Eleonora Peruzzi.

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The authors declare that they have no competing interests.

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Responsible Editor: Elena Maestri

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Macci, C., Peruzzi, E., Doni, S. et al. Landfarming as a sustainable management strategy for fresh and phytoremediated sediment. Environ Sci Pollut Res 28, 39692–39707 (2021). https://doi.org/10.1007/s11356-021-13134-y

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  • DOI: https://doi.org/10.1007/s11356-021-13134-y

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