Phosphorus removal by the use of apatite in constructed wetlands: design recommendations
Rétention du phosphore par apatite en filtres plantés de roseaux : recommandations de dimensionnement
Molle, P ; Martin, S. ; Esser, D. ; Besnault, S. ; Morlay, C ; Harouiya, N.
Type de document
Article de revue scientifique à comité de lecture
Affiliation de l'auteur
CEMAGREF LYON UR MALY FRA ; CIRSEE SUEZ ENVIRONNEMENT LE PECQ FRA ; SINT LA CHAPELLE DU MONT DU CHAT FRA ; CIRSEE SUEZ ENVIRONNEMENT LE PECQ FRA ; UNIVERSITE DE LYON I UMR 5510 VILLEURBANNE FRA ; CEMAGREF LYON UR MALY FRA
Résumé / Abstract
Phosphorus (P) removal in constructed wetlands (CWs) has received particular attention during the last decades by using specific materials which promote P adsorption/precipitation phenomena. Recent studies have shown an interest in using apatite materials to promote P precipitation onto their surface. About ten years of experiments at different scales (laboratory, pilot, full scale) have passed. The process is now open in France. This paper presents the first design recommendations according to the apatite mineral quality and treatment outlet requirements. Kinetics and their evolution with the material saturation degree are presented based on the k-C* model. The process can achieve 1 mgP.l-1 for long term while using surface P removal filter area of 0.5 m².p.e.-1. With a low land footprint and high P removal efficiency, the interest of the process also result in the orthophosphates accumulation on a phosphate mineral which makes easier to reuse phosphorus from wastewater once saturated.
Water Practice & Technology, vol. 6, num. 3, 9 p.