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Évolution des polluants organiques au cours du compostage de déchets organiques : approche expérimentale et modélisation

Abstract : The levels and availability of organic pollutants (OPs) are criteria for compost quality that determine their environmental impacts. In this work, we characterized the evolution of OP speciation during the composting of organic wastes in order to estimate OP availability in final composts. Four 14 C-labeled OPs were studied during the composting of sewage sludge with green waste: a polycyclic aromatic hydrocarbon (fluoranthene), two surfactants (4-n-nonylphenol, NP, and sodium linear alkylbenzene sulfonate, LAS) and a herbicide (glyphosate). An experimental set-up including six small-scale composting pilots was built. It was used to simulate the composting process with a good reproducibility. Organic pollutant sorption and mineralization capacities were analyzed during composting. Simple molecules were mainly degraded during the active composting phases and complex molecules during the maturation. Sorption decreased as compost maturity increased, except for glyphosate. The evolution of OP speciation during composting showed that the dissipation of LAS was largely due to mineralization, those of fluoranthene to the formation of non-extractable residues. Both mineralization and formation of non-extractable residues contributed to the dissipation of NP and glyphosate. The direct availability of OP in final compost was low. A model (COP-Compost) simulating the evolution of organic matter and OPs during composting was proposed. Hypotheses, specifying that the OP biodegradation and formation of non-extractable residues would be dependent of the overall microbial activity driven by organic matter decomposition, were validated.
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https://pastel.archives-ouvertes.fr/pastel-00546943
Contributor : Gwenaëlle Lashermes <>
Submitted on : Wednesday, December 15, 2010 - 11:06:14 AM
Last modification on : Tuesday, March 17, 2020 - 3:09:39 AM
Long-term archiving on: : Friday, December 2, 2016 - 4:29:03 PM

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Gwenaëlle Lashermes. Évolution des polluants organiques au cours du compostage de déchets organiques : approche expérimentale et modélisation. Sciences de l'environnement. AgroParisTech, 2010. Français. ⟨NNT : 2010AGPT0033⟩. ⟨pastel-00546943⟩

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