PROCEDE ET REACTEUR DE TRAITEMENT D'EAU UTILISANT UN LIT GRANULAIRE ADAPTE POUR ASSURER UNE FILTRATION OU UNE FILTRATION ASSOCIEE A UNE EPURATION BIOLOGIQUE DE L'EAU

Process for water treatment employing a granular bed (3) consisting of granular support materials of lower density than that of the water to be treated. According to this process each washing cycle consists in interrupting the draw-off of the treated water and stopping the feed of water to be treated so that the granular bed (3) floats in a given volume of water VL, in introducing washing air into the reactor with a view to ensuring stirring of the abovementioned floating bed, in interrupting the entry of air with a view to permitting a separation of the granular materials and of the sludge by density difference, with sedimentation of the said sludge and flotation of the said materials, and in removing the sludge at the base of the reactor and the water contained in it with a view to emptying the granular bed (3).