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Theses

Incidence de la biodégradation des matières organiques sur le devenir des métaux et des contaminants organiques dans un sol nickelifère et un sédiment de rivière

Abstract : Soils and river sediments are sources and recipients of pollutants coming from geochemical sources and anthropogenic activities. They contain various mineral and organic phases that are associated to metals and organic pollutants. Microbial activity plays a major role in the biogeochemical cycles of these compounds by the microorganism-mineral-organic matter interactions. The impact of organic matter (OM) biodegradation on the fate of metals and polycyclic aromatic hydrocarbons (PAH) was studied in two contrasting continental systems : a New Caledonia Ferralsol and a Lorraine river sediment. Incubation experiments were used to follow and quantify the microbial activity, and to define the mechanisms involved in pollutant evolution during OM biodegradation. The linkage between carbon and metal cycling was studied in detail. The results show that the nature of OM and the quantity of electron acceptors available in the medium control aerobic and anaerobic microbial activity. Under aerobiosis, OM biodegradation results in the carbonate and sulfide dissolution. Bacterial reduction of Fe and Mn induces the release of associated metals, particularly when microbial activity is stimulated by the input of an readily available organic substrate. Sulfate reduction leads to the precipitation of sorne metals. A metal redistribution occurs in the solid phase during microbial weathering to the most labile compartments. In the sediment, microbial activity leads to a dissipation of PAH under aerobiosis and to a lesser extent under anaerobiosis.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2001_0017_QUANTIN.pdf
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https://hal.univ-lorraine.fr/tel-01746681
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Submitted on : Thursday, March 29, 2018 - 10:42:37 AM
Last modification on : Monday, December 14, 2020 - 2:16:38 PM

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  • HAL Id : tel-01746681, version 1

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Cécile Quantin. Incidence de la biodégradation des matières organiques sur le devenir des métaux et des contaminants organiques dans un sol nickelifère et un sédiment de rivière. Science des sols. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10017⟩. ⟨tel-01746681⟩

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