Présentations Colloques

    Oral Presentation
    Session 6.02: Treated WasteWater REUSE for groundwater recharge: addressing the challenge
    Lafforgue Michel
    Infiltration in five artificial and natural wetlands downstream of wastewater treatment plants (France)
    The ZHART research project (2012-2016) aimed at designing artificial wetlands downstream of wastewater treatment plants, so as to improve the water quality on emerging contaminants, to become a source of biodiversity, and to have a better landscape integration. **In this project, five existing wetlands located downstream of wastewater treatment plants were surveyed in France (one natural and four artificial wetlands). The current presentation focuses on the hydrologic part of this study performed by Suez, with a more detailed insight on the water infiltration in these wetlands. Infiltration can have an impact, not only on the treatment efficiency of the wetlands, but also on the partitioning of the water output between surface waters and aquifers. It can then be a key element for designing the new artificial wetlands, and for that reason it was characterized for the studied sites. **For each of these sites, a hydrologic balance was calculated, from which the infiltration fluxes were defined by differences with the other parts of the water balance. These results enabled to estimate the permeability of the various wetlands, and its variability with time at the St Just Wetland site (based on a one year survey). **Globally, the infiltration ranges from 2 to 30% of the inputs, and the permeability varies from 10-6 to 5 10-9m s with a mean value around 10-7 m s. A more specific analysis of St Just site confirms the impact of bottom’s clogging on infiltration capacity, as well as that of storm events, and of water level in the wetland and in the aquifer. These results will be useful to establish the capacity of infiltration of artificial wetlands, and their potential impact on the aquifer recharge. **


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