Biodégradabilité - stabilité des matières organiques des sédiments de rivières : caractérisation et dynamique des fractions extractibles et des nutriments et polluants associés

Abstract : River sediments of Moselle catchment area (Moselle, Madon and Fensch) have been studied to improve the knowledge about this compartment of major interest for environmental questions (drinking water, transfer of pollutants and nutriments...). The studies were focused on organic matter which represents a major reactive pool. The characterization of 15 sediments by measurements of abiotic parameters (physical, chemical and physico-chemical) allows proposing a first typology related to human activities. Some sedimentation sites were defined, accumulating fine particles rich in organic matter and associated to anthropic modifications of the river bed (dam, channel, pollution). By studying the organic matter biodegradation, criteria of bioavailability could be defined on one hand, and evolution of extractable fraction of organic matter based on their physico-chemical properties (water soluble, lipidic, acid soluble, alkaline soluble) was assessed on the other hand in two selected sediments, polluted and unpolluted. Depending on the type of sediment and the conditions of incubation (aerobic vs. anaerobic), models of evolution of the organic fractions are observed either qualitatively and quantitatively. Specific or not microbial communities were numbered from field and laboratory experiments in relation with the presence of two model substrates: cellulose and phenanthrene.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_2007_0135_AUVRAY.pdf
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https://hal.univ-lorraine.fr/tel-01753733
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Submitted on : Thursday, March 29, 2018 - 4:47:49 PM
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Isabelle Auvray. Biodégradabilité - stabilité des matières organiques des sédiments de rivières : caractérisation et dynamique des fractions extractibles et des nutriments et polluants associés. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10135⟩. ⟨tel-01753733⟩

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