Designing vertical-flow constructed wetlands (VFCWs) to treat both rain events and dry weather flow is a complex task due to the stochastic nature of rain events. Dynamic models can help to improve design, but they usually prove difficult to handle for designers. This study focuses on the development of a simplified hydraulic model of French VFCWs using an empirical infiltration coefficient – infiltration capacity parameter (ICP). The model was fitted using 60-second-step data collected on two experimental French VFCW systems and compared with Hydrus 1D software. The model revealed a season-by-season evolution of the ICP that could be explained by the mechanical role of reeds. This simplified model makes it possible to define time-course shifts in ponding time and outlet flows. As ponding time hinders oxygen renewal, thus impacting nitrification and organic matter degradation, ponding time limits can be used to fix a reliable design when treating both dry and rain events.
Research Article|July 10 2014
Simplified hydraulic model of French vertical-flow constructed wetlands
1Irstea, Freshwater system, Ecology and Pollution Research Unit, 5 rue de la Doua – CS70077 – 69626, Villeurbanne cedex, France2SAFEGE de Lyon, 26 rue de la Gare 69009, Lyon, France and SCIRPE, 5, allée Alban Vistel 69110 Sainte Foy les Lyon, France
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Luis Arias, Jean-Luc Bertrand-Krajewski, Pascal Molle; Simplified hydraulic model of French vertical-flow constructed wetlands. Water Sci Technol 1 September 2014; 70 (5): 909–916. doi: https://doi.org/10.2166/wst.2014.309
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