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Etude du potentiel de valorisation énergétique ou matière de composés organiques extraits de lixiviats de déchets ménagers

Abstract : The management of municipal solid waste leachates (MSWL) is technically and economically restrictive. It thus should be interesting to consider this effluent no more as a waste but rather as a partially valorizable “co-product”. The dissolved organic matter (DOM) is one of the major components of MSWL and presents a twofold interest: a high load and comparable processes of transformation to those of natural organic matter (NOM).This study thus aimed at extracting the DOM from MWSL according to its hydrophobic character and identifying ways of valorization. Only hydrophobic (HPO*) and transphilic (TPH*) fractions were considered because of their characteristics and reactivity. Two different ways of valorization were investigated: energetic valorization and enrichment of a soil with low content in organic carbon (Corg).The characterization of HPO* and TPH* fractions and their comparison with fractions of NOM confirmed their high valorizable potential. Indeed, they are physically and chemically comparable to NOM, they can be quantified at concentrations up to 1000 times higher than NOM (high extraction potential when compared to environmental matrices such as surface water), and they are more easily biodegradable than NOM without any phytotoxic character.An optimized BMP test was first developed by using an experimental design to adapt the experimental conditions to the digestion of MSWL. It was then applied in different conditions to highlight the impact of the hydrophobic character of the DOM of MSWL on the anaerobic digestion, and mainly on methane production. According to the results, the transphilic-like organic molecules improve the biogas production. Besides, the hydrophilic-like compounds with low aromatic character decrease the methane content of the produced biogas contrary to the hydrophobic fraction.Finally, organic fractions extracted from MSWL were relevant to enrich soil with low content in organic carbon. The HPO* fraction better improves the Corg content when compared to the TPH* fraction whereas transphilic-like molecules enhances the soil biological activity.With the results of this research study, the HPO* and TPH* fractions extracted from a MSWL can thus be considered both to produce biogas and particularly methane and to be amended on soils. Their extraction can thus be economically viable and their treatment no more highly costly.
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https://tel.archives-ouvertes.fr/tel-01479002
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Submitted on : Tuesday, February 28, 2017 - 3:26:07 PM
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Camille Baccot. Etude du potentiel de valorisation énergétique ou matière de composés organiques extraits de lixiviats de déchets ménagers. Sciences de la Terre. Université de Limoges, 2016. Français. ⟨NNT : 2016LIMO0107⟩. ⟨tel-01479002⟩

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