Denitrification reactor with a fixed culture

A denitrification reactor with a culture fixed to an organized plastic-type support, combined with an installation for the nitrification and elimination of the carbon-based pollution, said reactor being 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, characterized in that it comprises:

• two denitrification compartments (3, 4) provided with an organized plastic-type lining (8), these compartments, arranged in parallel, operating via successive, i.e. alternating, sections or loads, one being in the filling phase (denitrification and self-cleaning-out of the excess biomass) while the other is in the emptying phase (denitrification and drainage of the excess biomass);
• a drainage compartment (6) for receiving the denitrified effluent originating from one or other of said denitrification compartments;
• a system for supplying the mixture of effluents consisting of a rotary arm (11) which alternately supplies, at the surface, each of said compartments;
• and
• means (19, 21) for ensuring the recirculation of the denitrified effluent from the drainage compartment (6) to the installation (2) for the nitrification and elimination of the carbon-based pollution.