The natural environment is a formidable water purification and filtering machine, which can be studied not only to develop new treatment processes for recalcitrant contaminants, but also to recommend new eco-design concepts that allow to reduce pollution at the source.
In the current context of combating the degradation of our water and soil resources by anthropogenic contaminations, the study of the bio-physicochemical mechanisms that govern their behavior in the different environmental reservoirs is a key research issue in the science of water. 'environment. This involves taking into account the flow, fate and impact of contaminants in the different stages of the water cycle.
At different scales, colloidal particulate matter plays a key role in natural attenuation processes. For example, in river water, the transfer of a spilled pollutant often results from the competition between its horizontal transport by the current and its rate of sedimentation after attachment to colloids. In soils, or more generally in porous media, the migration of colloidal particles within the network contributes to the vectorization or trapping of pollutants associated therewith. Thus, the study of these processes makes it possible to better understand the fate of pollutants in the aquatic environment and to identify their zones of final accumulation.
The presentation will address these issues of physicochemistry of the environment through the case study on the environmental impact of nanotechnology and in particular the life cycle of sunscreens.