Abstract: Method for bringing ozone into contact with a flow of liquid in which a fraction of the liquid flow is tapped off, a carrier gas laden with ozone is injected into the tapped-off flow, forming gas bubbles, the gas bubbles and the liquid are mixed so as to form a two-phase tapped-off flow, and the tapped-off flow is reintroduced into a descending vertical stream of the main liquid flow, this vertical stream undergoing, at the bottom, a change of direction to essentially the horizontal, the reintroduction of the tapped-off flow being carried out at the lower end of an injection tube immersed in the descending vertical stream of the main flow.

Abstract: Method for bringing ozone into contact with a flow of liquid in which a fraction of the liquid flow is tapped off, a carrier gas laden with ozone is injected into the tapped-off flow, forming gas bubbles, the gas bubbles and the liquid are mixed so as to form a two-phase tapped-off flow, and the tapped-off flow is reintroduced into a descending vertical stream of the main liquid flow, this vertical stream undergoing, at the bottom, a change of direction to essentially the horizontal, the reintroduction of the tapped-off flow being carried out at the lower end of an injection tube immersed in the descending vertical stream of the main flow.

Abstract: The invention concerns a water clarifying device comprising a flotation zone (c), a membrane-based filtering zone (e) and extracting means (d), the flotation zone (c) and the membrane-based filtering zone (e) having a common partition wall (P), the common partition wall (P) including in its lower part an opening (o) directly allowing through flotated water towards the filtering zone (e), thereby feeding the membranes with flotated water from down upwards both in filtering phase and in backwashing phase.

Abstract: A method for the treatment and filtration of fluids, i.e. liquid effluents such as raw water containing organic pollutants in a solution, using gravity separation means (10) such as a decantation and flotation means, and membrane separation means (13) in a finishing stage, wherein a first pulverulent reagent (1) is introduced into the flow of a fluid to be treated upstream from gravity separation, and a second pulverulent reagent (2) is introduced downstream from the membrane separation. The inventive method is characterized in that the coagulant required for separation is injected before the first pulverulent reagent; in that the first and second pulverulent reagents (1,2) have different characteristics, i.e. in terms of granulometry, adsorption capacity adapted to the pollutants which are to be eliminated; and in that the second pulverulent reagent (2) is recycled from membrane separation means (13) upstream from the gravity separation means (10).

Abstract: Dual-flow filter for the biological purification of effluents, particularly water, comprising at least two filtration cells, arranged in series, in fluid communication, with one another so that the effluent to be treated passes through them successively, these two cells being separated by an intermediate box provided with aeration means, wherein the first filtration cell is of the ascending flow type and the second filtration cell is of the descending flow type, and the aeration in the intermediate box takes place countercurrentwise with respect to the liquid flow moving through the box, with a movement of the flows guided with the aid of a siphon partition.

Abstract: Process for removing nitrogenous compounds, in particular nitrates, and for remineralizing water with a low mineral content, characterized in that the removal of the nitrogenous compounds and at least partial remineralization of the untreated water are carried out simultaneously by biological treatment, in the same reactor. The denitrified and remineralized water is then subjected to coagulation, flocculation and clarification treatments.