Traitement en ligne des eaux pluviales en zone urbaine dense

Abstract : An online urban storm-water treatment system has been studied in this work. This system is able to treat the runoff from a highly impervious watershed (Boudonville) in Greater Nancy (North-East of France). It has a capacity of 7000 cubic meters. Some storage tanks are existing in the watershed. The treated water is discharged into the Meurthe River, while the sludge is treated in the Greater Nancy wastewater treatment plant in Maxéville. The strategy adopted in this work allowed for the consideration of the treat ment system from several angles: •first of all, the system is analyzed through its elementary components (sand removal unit, reagents injection and reactors for flocculation-coagulation and clarifiers): this has been done by observing the variations in water quality at the different treatment levels with online instrumentation. This has been completed with an offline characterization. •the flocculation-coagulation section, which was not yet operational during our work, was studied in the laboratory by jar tests. The water to be treated was sampled from the Boudonville watershed to be close to the conditions that should be observed in the Charles Keller treatment system. •finally the stormwater treatment was simulated as part of a full storm-water management system (watershed-Charles Keller treatment system-wastewater treatment plant). •The results that were obtained showed in the one hand the complexity of using such a treatment system in real-life conditions, especially with a coagulation / flocculation part to it, which has some conceptual issues.
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Amine Bouarab. Traitement en ligne des eaux pluviales en zone urbaine dense. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0129⟩. ⟨tel-01750957⟩

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