Treatment performances of French constructed wetlands. Results from a database collected over the last 30 years | Performances du traitement des filtres plantés de roseaux en France. Résultats obtenus à partir d'une base de données regroupant les données collectées au cours des 30 dernières années.
2014
Morvannou, A. | Forquet, N. | Michel, S. | Troesch, S. | Molle, Pascal
After 30 years of development of constructed wetlands (CWs) treating raw domestic wastewater for small communities (< 5,000 people equivalent, pe) in France, about 3,500 plants are currently in operation. If most of them are composed of two vertical stages in series, many configurations exist (association with horizontal flow or pond systems, vertical flow with recirculation, partially saturated systems, etc.). A previous database analysis was carried out 10 years ago on the classical French system allowing the global performances to be observed. Nowadays, the database improvement, thanks to Irstea and the monitoring of the French technical department on full-scale two vertical stages (VFCW), allows improving our understanding and having a greater perspective on the treatment performances of these configurations fed with raw wastewater. Typical concentrations at the second stage outlet are 74mgCOD.L -1 , 17 mgTSS.L -1 and 11 mgTKN.L -1. This paper presents: -A description of existing VFCW based on the study of 415 plants;-An investigation of pollutant removal performances in relation to the loads applied for the first treatment stage.
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