Degremont

Suez International

Francois Le Quesne

Patrick Vion

Sylvie Baig

Pedro Fonseca

Process and device for dispersing gas in a downward flow of liquid, according to which the liquid is distributed along at least one jet (A) directed downwards, preferably along a plurality of jets; gas is distributed radially (F) towards the liquid jet or jets in order to be entrained by the liquid; and the liquid-gas mixture is channeled into a downflow vertical tube (P).

Process and device for dispersing gas in a liquid

The invention relates to a rapid flotation device, in particular using dissolved air, for treating water laden with suspended matter (MES). The device comprises a mixing area (B) separated from a flotation area (C) by a wall (n) above which the liquid to be treated passes from the mixing area. The bottom portion of the flotation area comprises: a perforated floor () located above an apron (R), a floated-water discharge being provided under the floor and leading to an outlet system (); and at least two separate channels () which are oriented in the direction of flow of the water and are provided under the floor (), and under optional structures (w) extending from the floor, to a point upstream of the outlet system (). The downstream end () of the channels is open and located above the floor level, and a discharge means (V) is provided, for each channel, at the end of the downstream bottom portion of said channel.

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Issy les Moulineaux, France

Francois Le Quesne