Comment \u00e7a marche ?<\/strong><\/p>\nLe lagunage naturel et, plus r\u00e9cemment, les filtres plant\u00e9s de roseaux se sont fortement d\u00e9velopp\u00e9s dans le domaine du traitement des eaux us\u00e9es des petites collectivit\u00e9s. Leur association permet, dans certains cas, d\u2019accro\u00eetre les capacit\u00e9s hydrauliques tout en maintenant un niveau de qualit\u00e9 optimum. Cette fiche ne parle pas de techniques intensives (disques biologiques, lits bact\u00e9riens, boues activ\u00e9es) aussi envisageables en petites collectivit\u00e9s.<\/p>\n
![\"epur.jpg\"](\"http:\/\/staging.sillon38.com\/wp-content\/uploads\/2009\/01\/epur.jpg\")
<\/p>\n
Le filtre plant\u00e9 de roseaux est un proc\u00e9d\u00e9 extensif d’\u00e9puration bien adapt\u00e9 au traitement des eaux us\u00e9es des petites collectivit\u00e9s gr\u00e2ce \u00e0 sa simplicit\u00e9 d\u2019exploitation (\u00e0 faible co\u00fbt) et \u00e0 sa fiabilit\u00e9 de leur fonctionnement. Son efficacit\u00e9 est aujourd’hui prouv\u00e9e en ce qui concerne l’\u00e9limination du carbone et la nitrification. En revanche, ce n’est pas le cas du phosphore, mol\u00e9cule responsable de l’eutrophisation des rivi\u00e8res. L’enjeu pour les scientifiques du Cemagref est de concevoir un proc\u00e9d\u00e9 simple, bon march\u00e9 et respectueux de l’environnement pour \u00e9liminer le phosphore.<\/p>\n
Le Cemagref poursuit son travail sur le dimensionnement, la gestion et la conception de ces stations pour les adapter \u00e0 des r\u00e9seaux d’assainissement collectant beaucoup d’eaux parasites et, \u00e0 terme les r\u00e9seaux unitaires. Par ailleurs, les recherches se poursuivent pour accro\u00eetre les performances sur la r\u00e9tention du phosphore et pour r\u00e9duire les concentrations d’azote global rejet\u00e9es, en promouvant des conditions favorables \u00e0 la d\u00e9nitrification. Les tr\u00e8s faibles rejets de sels ammoniacaux d\u00e9j\u00e0 obtenus ne sauraient en effet suffire dans certaines zones sensibles \u00e0 l’eutrophisation.<\/p>\n
Contact : Alain Li\u00e9nard, Lyon
\nT\u00e9l. 04 72 20 87 87
\nalain.lienard@cemagref.fr<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"Aujourd\u2019hui, pr\u00e8s de six mille communes fran\u00e7aises de moins de deux mille habitants ne disposent toujours pas de station d\u2019\u00e9puration. Or les effluents domestiques ont des impacts non n\u00e9gligeables sur la qualit\u00e9 des cours d\u2019eau.\u00a0 En milieu rural, une des…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[87],"tags":[],"class_list":["post-4888","post","type-post","status-publish","format-standard","hentry","category-assainissement"],"yoast_head":"\n
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