Abstract: Installation for the treatment of municipal and/or industrial wastewaters comprising a basin that receives the water to be treated and a series of discs (4) having a packing (G) that are parallel and vertical, mounted on a horizontal shaft (5), partially submerged in the water to be treated, and rotated so that the biomass which grows on the surface of the packing of the discs is alternately brought into contact with the water to be treated and oxygen from the air. The configuration of the packing (G) of the discs (4) is chosen so that the developed surface area of the packing in one zone of the disc increases with the distance from this zone to the axis of rotation (X-X).

Abstract: Installation for the treatment of municipal and/or industrial wastewaters comprising a basin that receives the water to be treated and a series of discs (4) having a packing (G) that are parallel and vertical, mounted on a horizontal shaft (5), partially submerged in the water to be treated, and rotated so that the biomass which grows on the surface of the packing of the discs is alternately brought into contact with the water to be treated and oxygen from the air. The configuration of the packing (G) of the discs (4) is chosen so that the developed surface area of the packing in one zone of the disc increases with the distance from this zone to the axis of rotation (X-X).

Abstract: A denitrification reactor with a culture fixed to an organized plastic-type support is combined with an installation for the nitrification and elimination of the carbon-based pollution The reactor is supplied with a mixture of the raw effluent to be treated and of the effluent originating from the installation for the nitrification and elimination of the carbon-based pollution. The reactor includes two denitrification compartments (3, 4) arranged in parallel and operating altenatingly between a filling phase (denitrification and self cleaning-out of the excess biomass); and an emptying phase (denitrification and drainage of the excess biomass). A system for supplying the mixture of effluents consisting of a rotary arm (11) which alternately supplies the mixture to each of the compartments.

Abstract: The invention relates to a reactor comprising two denitrification compartments (3,4) provided with an organised plastic-type lining, said compartments being arranged in parallel and operating by sections or successive loads, that is alternately, one being in the filling phase while the other is in the emptying phase; a drainage compartment (6) for receiving the denitrified effluent from one or other of the denitrification compartments; a system for supplying a mixture of effluents consisting of a rotary arm (11) which alternately supplies both compartments, via the surface thereof; and means for ensuring the recirculation of the denitrified effluent from the drainage compartment (6) towards the installation (2) for the nitrification and elimination of the carbonated pollution.