LAboratoire de Spectrochimie Infrarouge et Raman – UMR 8516
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Description of the subject

Multidisciplinary study of the transfer and degradation of chlorinated aliphatic hydrocarbons (CAH) and other contaminants in the groundwaters of the chalk aquifer located in the south of Lille
Supervisor(s): G. Billon
Abstract: 

Within the framework of the COHMET project (2017-2020), the BRGM, the LASIR laboratory (UMR 8516) and the European Metropolis of Lille (MEL) are interested in the evolution of the chemical status of groundwater bodies in the south of Lille. Due to its past and intense industrial activities, this area has been strongly impacted on the surface by multiple inorganic and organic contaminations. Although the soil has a power of pollution attenuation for groundwater, some pollutants, and in particular chlorinated aliphatic hydrocarbons are detected in many piezometers located in the chalk table. Knowing that their degradation are slow, that the source points are multiple and not identified in general and that the water resource in this zone is strategic, it is imperative to develop research on the precise distribution, transfer and degradation processes of these contaminants. Depending on preliminary screening, other substances could also be considered such as perchlorates, nickel or selenium.Postdoc COHMET