Omnium De Traitements Et De Valorisation

Institut Francais Des Sciences Et Technologies Des Transports, De L'amenagement Et Des Reseaux

Iveco France S.a.

Philippe Rey

Gilbert Desbos

Bruno Jeanneret

Frank Rogalla

Guy Pierre Gendre

Alexandre Stoehr

To purify untreated water, for example waste water, containing organic pollution, materials in suspension and nitrogen-containing pollution, reagents are added under conditions adapted to coagulate all of the materials in suspension, including colloidal materials, to form granular physical/chemical floc. Diluting water is added, preferably after the reagents, in a flowrate ratio of at least 2/1. The dilute flocculated water is caused to flow through a bed of sludge in the form of such dense and granular floc and denitrifying bacteria. The bed is subject to turbulent but intermittent agitation. A denitrified effluent is recovered. This denitrified effluent is caused to flow through a biological filter or preferably through a fluidized bed containing nitrifying bacteria and into which oxygen or air is injected. A clarified effluent is obtained, some of which is recycled as the diluting water.

Method and installation for purifying water using variably agitated

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Chelles, France

Philippe Rey