Etude des mécanismes de dégradation de solvants chlorés dans les eaux souterraines - Application dans les craies fracturées

At an abandoned industrial site in Belgium, groundwater quality in a chalky aquifer had been impacted by a mixture of chlorinated aliphatic hydrocarbons inducing a significant change in hydrochemistry.Based on this case study, the aim of the thesis is to study transport and attenuation mechanisms of chlorinated solvents in the subsurface, considering their effects on the chemistry of the groundwater. The first part is devoted to analyze and interpret the collected data on the contaminated site. It allows to improve our understanding of the processes governing the reactive transport and especially the degradation of aliphatic organochlorines as observed on the site. The influence on the hydrochemistry of groundwater in the vicinity of the study area is studied. In a second part of the research, the use of a numerical model simulating groundwater flow and reactive transport for chlorinated solvents will improve our understanding and clarify the main attenuation mechanisms and their impact on the groundwater chemical composition.Etude des mécanismes de dégradation de solvants chlorés dans les eaux souterraines - Application dans les craies de Hesbay