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Bulk and mapping speciation analyses unveil the pattern and heterogeneity of cu species during organic waste treatment

Doelsch Emmanuel, Le Bars Maureen, Etschmann Barbara, Formentini Thiago Augusto, Legros Samuel, Levard Clément, Chaurand Perrine, Basile-Doelsch Isabelle, Rose Jérôme, Brunetti Gianluca, Doolette Casey, Howard Daryl L., Lombi Enzo. 2024. Bulk and mapping speciation analyses unveil the pattern and heterogeneity of cu species during organic waste treatment. Environmental Science and Technology, 58 (32) : 14439-14449.

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Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Organic wastes (OWs) can be a common source of copper (Cu) contamination of agricultural soils. Here we conducted a comprehensive study of 22 raw and treated OWs sampled at 6 different full-scale OW treatment plants. Bulk XANES analysis findings indicated that the Cu oxidation state was subject to changes throughout the OW treatment process, mostly depending on the anaerobic/aerobic conditions prevailing in each treatment stage. These changes were independent of the OW origin (agricultural, urban or industrial). Cu(I) prevailed in raw OWs and digestates (88–100%), whereas Cu(II) dominated in composts (46–100%). Bulk EXAFS analysis confirmed these observations and revealed that Cu(I) species in raw OWs and digestates consisted mainly of Cu(I)-sulfide (76–100%), while Cu(II) species (60–100%) in composts were Cu(II)-citrate, Cu(II)-carbonate and amorphous Cu(II)-phosphate. Interestingly, we observed that anaerobic digestion was conducive to the formation of crystallized Cu(I)-sulfides at the expense of nanosized and poorly crystalline Cu(I)-sulfide species, and that the recalcitrant Cu(I) species in composts was always crystallized Cu(I)-sulfide. XANES imaging analysis revealed Cu(II) species present in low proportions (2–4%) that were not detected using bulk XAS analysis in raw OWs and digestates. This demonstrated the potential of XANES imaging for probing minor species in complex matrices.

Mots-clés Agrovoc : traitement des déchets, déchet organique, déchet agricole, compost, spectroscopie aux rayons x

Mots-clés libres : Trace element, Digestate, Compost, Quantitative mapping, Copper sulfide, X-ray absorption spectroscopy

Classification Agris : Q70 - Traitement des déchets agricoles
P02 - Pollution

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement européennes : European Commission

Agences de financement hors UE : Agence Nationale de la Recherche

Programme de financement européen : H2020

Projets sur financement : (FRA) Diagnostic des traitements des déchets et comportement des contaminants dans l'environnement, (EU) SPEciation and dynamiCs of TRace Elements

Auteurs et affiliations

  • Doelsch Emmanuel, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0002-7478-4296 - auteur correspondant
  • Le Bars Maureen, ETH (CHE)
  • Etschmann Barbara, Monash University (AUS)
  • Formentini Thiago Augusto, CIRAD-PERSYST-UPR Recyclage et risque (FRA)
  • Legros Samuel, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0001-7081-6679
  • Levard Clément, CNRS (FRA)
  • Chaurand Perrine, Aix-Marseille université (FRA)
  • Basile-Doelsch Isabelle, INRAE (FRA)
  • Rose Jérôme, CNRS (FRA)
  • Brunetti Gianluca, University of South Australia (AUS)
  • Doolette Casey, University of South Australia (AUS)
  • Howard Daryl L., Australian Synchrotron (AUS)
  • Lombi Enzo, University of South Australia (AUS)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/610182/)

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