Abstract: Liquid effluent treatment module comprising at least one tank portion suitable for receiving a plurality of packing elements that may receive a biological material, the tank portion defining a horizontal longitudinal axis and comprising at least one effluent feed, characterized in that the tank portion further comprises: ?at least one line for collecting treated effluent arranged in a central part of the tank portion and parallel to the horizontal longitudinal axis, ?at least one air injection line arranged in a lower part of the tank portion, off-centered and parallel to the line for collecting treated effluent so as to give rise to a spiral movement of the liquid effluents.

Abstract: Method for treating aqueous effluents, comprising the following steps: a) simultaneously feeding the aqueous effluents into at least two basins comprising at least one upstream basin and at least one intermediate basin in the flow direction of the aqueous effluents, the basins being in fluid connection and in series with one another; b) biologically treating, in a fluid bed, the aqueous effluents to be treated in the at least two basins; c) transferring at least one portion of the biologically treated aqueous effluents to a de-aerator; d) de-aerating the biologically treated aqueous effluents in the de-aerator; e) recirculating at least one portion of the de-aerated aqueous effluents to at least the upstream basin and preferably the at least two basins.

Abstract: Liquid effluent treatment module comprising at least one tank portion suitable for receiving a plurality of packing elements that may receive a biological material, the tank portion defining a horizontal longitudinal axis and comprising at least one effluent feed, characterized in that the tank portion further comprises: ?at least one line for collecting treated effluent arranged in a central part of the tank portion and parallel to the horizontal longitudinal axis, ?at least one air injection line arranged in a lower part of the tank portion, off-centered and parallel to the line for collecting treated effluent so as to give rise to a spiral movement of the liquid effluents.

Abstract: A system for biologically treating wastewater comprising a rotating drum disposed within a tank. Biofilm carriers are contained in the drum. One or more hollow tube aerators are secured inside the drum to a perforated wall that forms a part of the drum. As the drum is rotated within the tank, the mixing of the biofilm carriers with the wastewater therein and the action of the hollow tubes aerates the wastewater in the rotating drum.

Abstract: Liquid effluent treatment module comprising at least one tank portion suitable for receiving a plurality of packing elements that may receive a biological material, the tank portion defining a horizontal longitudinal axis and comprising at least one effluent feed, characterized in that the tank portion further comprises: ?at least one line for collecting treated effluent arranged in a central part of the tank portion and parallel to the horizontal longitudinal axis, ?at least one air injection line arranged in a lower part of the tank portion, off-centered and parallel to the line for collecting treated effluent so as to give rise to a spiral movement of the liquid effluents.

Abstract: System (1) for the biological treatment of wastewater comprising a tank (10) comprising a point for the entry (11) of water to be treated and a point for the exit (12) of treated water; a rotating drum (20) defining an internal volume, said drum being capable of rotating about a horizontal shaft (200) and having a wall (21) that is at least partly permeable to water, said rotating drum being disposed the tank and being intended for partial submersion in the water contained in the tank, less than half of its internal volume bathing in the water contained in the tank; a driving means (30, 31, 32) intended for driving the drum in rotation along the horizontal shaft; free media (15), having a surface suited to the development of a biofilm, disposed within the drum (20) and retained by the wall of this drum, the free media occupying a volume ranging from 30% to 80% of the internal volume of the rotating drum; at least one hollow tube (40) extending in parallel to the horizontal shaft fixed to the wall of the rotat