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Dynamique des flux de micropolluants et mécanismes de dépollution des rejets pluviaux urbains stricts à travers une technique alternative : approche multi-échelles par des méthodes expérimentale et numérique

Abstract : Stormwaters are identified as a major source of pollution for waterbodies. Particularly, metals and Polycyclic Aromatic Hydrocarbons (PAHs) in stormwater are known as the most toxic compounds for the fauna and flora. To limit the impact of these micropollutants on hydrosystems quality, stormwater constructed wetlands (SCW) have been built worldwide. This study aims i) to assess the efficiency of a 5-years-old SCW that combined a sedimentation pond followed by a vertical flow sand filter in urban area (Strasbourg 67, France), ii) to determine micropollutants storage in water and soils during dry period, (iii) to investigate the seasonality impacts on SCW performances, (iv) to evaluate copper, lead and zinc sorption behavior on the filter sand and (v) to model micropollutants and rain water fluxes from the catchment to the filter output. 3 years of on-site monitoring and 13 rain event sampling campaigns have shown that SCW hydraulic and treatment performances are constant over the year. Rain water is characterized by high loads of zinc and its micropollutants loads depend on the rain event depth. Then, chemical analyses, sequential extractions and batch experiments performed on the SCW substrate highlight that metals mobility in the filter is affected by pH and metal concentration. A model based on the Richard’s equation has been developed and predicts with success the 1-D vertical flow in the filter.
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https://tel.archives-ouvertes.fr/tel-01825476
Contributor : Abes Star :  Contact
Submitted on : Thursday, June 28, 2018 - 12:59:07 PM
Last modification on : Tuesday, May 7, 2019 - 4:15:22 AM
Long-term archiving on: : Thursday, September 27, 2018 - 6:52:32 AM

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walaszek_milena_2018_ED269.pdf
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  • HAL Id : tel-01825476, version 1

Citation

Milena Walaszek. Dynamique des flux de micropolluants et mécanismes de dépollution des rejets pluviaux urbains stricts à travers une technique alternative : approche multi-échelles par des méthodes expérimentale et numérique. Génie des procédés. Université de Strasbourg, 2018. Français. ⟨NNT : 2018STRAD002⟩. ⟨tel-01825476⟩

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