Performances evaluation of phosphorus removal by apatite in constructed wetlands treating domestic wastewater: Column and pilot experiments
2009
Harouiya, N. | Prost Boucle, S. | Morlay, C. | Esser, D. | Martin Ruel, S. | Molle, Pascal
In constructed wetlands (CWs) treating domestic wastewater, good treatment performances are obtained on mains parameters except phosphorus (P) which can cause eutrophication problems. In order to improve P removal from wastewater with a low specific filter surface per people equivalent (p. e.), different materials have been tested: man-made and natural materials, industrial by-products, and a mixture of these materials. The P removal by natural apatite have been studied by a very few works. Despite apatite materials appears to possess high and long-term retention capacity, a better knowledge is needed to precise the quality of apatite to be used and the P removal evolution with time and water quality. In this work the P retention kinetics have been studied in two different scales (lab-experiments and pilots) on different apatite qualities. Retention rate in pilots is smaller than the one found in lab-experiments and the results suggested that a security coefficient might be applied while designing apatite filter.
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