Water treatment plant comprising a dissipating member, and associated method

Abstract

The present invention relates to a water treatment plant (10) comprising a structure (15) provided with spray holes (22) for spraying a water jet, and a dissipating member (28) arranged opposite and downstream of the spray holes. The dissipating member comprises: - a recovery structure (32) arranged opposite the spray holes in a spray direction (R) of the jet, the recovery structure (32) extending in an extension direction (E) perpendicular to the spray direction (R), and - at least one dissipating structure (34) extending the recovery structure (32) in an extension direction (P) perpendicular to the extension and spray directions, the dissipating structure comprising a portion that deviates from the spray holes in the spray direction.

Description

[0001] DESCRIPTION

[0002] Water treatment plant comprising a dissipation unit and associated process

[0003] The present invention relates to a water treatment installation, such as municipal or industrial wastewater, water intended to be made potable or seawater intended to be desalinated.

[0004] The installation is, for example, a water treatment installation by settling, such as a settling tank or clarifier, designed to separate suspended matter present in the water and to provide a flow of clarified water.

[0005] Alternatively, the installation is a water treatment installation using biological or physico-chemical processes.

[0006] In this regard, it is known to introduce water into an enclosure of the installation to subject it to treatment.

[0007] The incoming water generally comprises a mixture of solid and / or liquid and / or gaseous substances, such as suspended solids, organic and inorganic matter, microorganisms, chemicals, etc.

[0008] In particular, municipal wastewater can carry fibrous waste (hair, or textiles), commonly referred to as "filth".

[0009] In order to convey the loaded water to the hydraulic components, a certain fluid velocity in the upstream conveying channel is necessary to avoid the deposits and stagnation of solid substances in the conveying channel.

[0010] The water is then introduced into a treatment chamber within the treatment plant. This introduction is achieved, for example, through jet nozzles that generate a water jet. Generally, the desired flow rate within the chamber is not compatible with the fluid velocity in the channel and / or inlet. Indeed, to optimize water treatment, lower and more uniform velocities are required within the chamber.

[0011] It is therefore known to place one or more kinetic energy dissipation devices at the outlet of the water jets to generate additional pressure losses and slow down and distribute the water as it enters the treatment unit. In known treatment plants, deflector devices, such as deflector plates, are placed downstream of the water jets to dissipate and divert the water jet from its initial direction of projection.

[0012] Such devices are reliable but not entirely satisfactory. Indeed, deflector plates only divert and dissipate the jet in two dimensions. Furthermore, particularly when the water is laden with fibers, deflector plates or systems with more complex geometries, such as grids or perforated plates, promote fiber adhesion and thus create obstacles to fluid flow.

[0013] An object of the invention is therefore to provide a water treatment installation comprising a water jet dissipation device which enables rapid dissipation of the jet's kinetic energy from the moment it exits through projection orifices, particularly for high jet speeds exiting the projection orifices, and which operates very reliably with minimal maintenance, even when the water is loaded with solid matter.

[0014] To this end, the invention relates to a water treatment installation comprising a structure equipped with at least one orifice for projecting a water jet, and a dissipation element disposed opposite and downstream of at least one projection orifice, according to the direction of circulation of the water jet, characterized in that the dissipation element comprises:

[0015] - a recovery structure intended to be positioned opposite at least one projection orifice along a jet projection direction, the recovery structure extending in a direction perpendicular to the projection direction, and

[0016] - at least one dissipation structure extending the recovery structure along an extension direction perpendicular to the extension direction and the projection direction, the dissipation structure comprising at least one portion intended to move away from at least one projection orifice along the projection direction.

[0017] The recovery structure slows the water by creating an obstacle to its flow at the projection orifice. The water is then projected in multiple directions, widening the velocity field, which ensures faster deceleration and better distribution.

[0018] Each dissipation structure, due to its particular three-dimensional format, disperses the water in a multitude of directions downstream.

[0019] Thus, the kinetic energy of the water jet is rapidly dissipated at the outlet of the orifice and the direction of the water jet is deflected, thus promoting the homogeneity and distribution of the water jet and its circulation parameters (speed, energy) within the enclosure of the installation.

[0020] The dissipation device allows the initial velocities and preferred directions of the water jet to be transformed so that the water in the enclosure has adequate velocities and an evenly distributed and homogeneous velocity field for treatment, including when it contains solid materials such as fibers.

[0021] According to other advantageous aspects of the invention, the treatment installation comprises one or more of the following features, taken individually or in all technically possible combinations:

[0022] - the dissipation element is elongated along the direction of extension,

[0023] - the largest dimension of the dissipation element is taken along the direction of extension;

[0024] - the dissipation unit comprises two dissipation structures, each dissipation structure extending a distinct edge, taken along the direction of extension, of the recovery structure;

[0025] - the recovery structure comprises a concave face and a convex face, the concave face being positioned opposite at least one projection orifice, according to the projection direction, the recovery structure having a C-shaped cross-section profile in a plane perpendicular to the extension direction;

[0026] - each dissipation structure comprises a concave face and a convex face, the convex face being turned towards at least one projection orifice, each dissipation structure forming with the recovery structure an S shape in a plane perpendicular to the extension direction;

[0027] - the dissipation element has a profile having two edges, in a plane perpendicular to the direction of extension, continuously differentiable over the whole of the profile between the edges of the profile;

[0028] - the structure includes at least two projection orifices, each projection orifice being separated from a neighboring projection orifice by a first distance, taken along the direction of extension, the dissipation element having a length, taken along the direction of extension, greater than the first distance;

[0029] - the dissipation element extends to a distance from at least one projection orifice, taken along the projection direction, of between 2 times and 3 times the transverse dimension of at least one projection orifice;

[0030] - the dissipation element is a profile of constant cross-section along the direction of extension;

[0031] - in a plane perpendicular to the direction of extension, the recovery structure has a symmetrical profile around a median plane passing through a central point, the center of at least one projection orifice being aligned with the central point along the direction of projection; - the direction of projection extends horizontally, advantageously perpendicular to a guiding surface of the structure defining at least one projection orifice, the direction of extension extending vertically;

[0032] - the installation includes a channel for conveying water to the structure, an enclosure defining an internal volume for receiving the water for treatment, the structure separating the conveying channel and the enclosure, and at least one projection orifice connecting the conveying channel to the internal volume of the enclosure;

[0033] - the conveying channel extends perpendicularly to the direction of projection; and

[0034] - the installation is chosen from a decanter, a clarifier, or a dissolved air flotation device.

[0035] The invention also relates to a method for dissipating a water jet implemented by a treatment plant as described above, the dissipation method comprising the following steps:

[0036] - entry of a water jet through at least one water jet projection orifice,

[0037] - recovery of the water jet by the recovery structure, the water jet being at least partially redirected towards at least one projection orifice, and

[0038] - dissipation and / or deflection of the water jet by at least one dissipation structure, the water jet being dispersed in a plurality of directions.

[0039] The invention will become clearer upon reading the following description, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0040] - Figure 1 is a perspective view of a water treatment installation according to the invention, the installation comprising a dissipation element fixed to a structure comprising orifices for projecting a water jet,

[0041] - Figure 2 is a cross-sectional view, along a plane perpendicular to the direction of extension, of the dissipation element of Figure 1, and

[0042] - Figure 3 is a schematic representation of the directional lines of the water jet dissipated by the dissipation device of Figure 1.

[0043] A water treatment installation 10 is partially represented in Figure 1.

[0044] The treatment plant 10 is, for example, a plant for treating and / or settling municipal or industrial wastewater, seawater intended for desalination, or water intended for making it potable. For example, the plant 10 is selected from a settling tank, a clarifier, or a dissolved air flotation device, designed to separate suspended solids present in the water 12 and to provide a flow of clarified water.

[0045] In a particular example, the treatment plant 10 is intended for the treatment of water 12 comprising, for example, a flocculant, dissolved gas, fibers, organic matter, suspended matter, microorganisms, chemicals, etc.

[0046] Fibers include, for example, keratin fibers such as hair or textile fibers.

[0047] As shown in Figure 1, the installation 10 includes a structure 15 separating a water conveying channel 17 from the water 12 to the structure 15, from an enclosure 20 defining an internal volume for receiving the water 12 for treatment.

[0048] The enclosure 20 is for example a basin or a chamber intended to receive the water 12. For example, the enclosure 20 is open in its upper part.

[0049] Structure 15 includes, for example, a wall delimiting enclosure 20. It presents on the side of enclosure 20 a guiding surface 21, extending along an extension direction E. The extension direction E extends horizontally here.

[0050] The conveying channel 17 extends, for example, along the structure 15. The water 12 flowing in the conveying channel 17 therefore has a direction of movement substantially parallel to the plane of the guiding surface 21 of the structure 15.

[0051] In other words, the water 12 flows in the conveying channel 17 substantially parallel to the extension direction E.

[0052] Water 12 flows, for example, in the conveying channel 17 at speeds between 0.05 m / s and 2 m / s.

[0053] Structure 15 defines at least one projection orifice 22 for a water jet 12, each orifice 22 fluidly connecting the conveying channel 17 to the internal volume of the enclosure 20.

[0054] Each projection orifice 22 is in particular an inlet orifice for water 12 into the enclosure 20.

[0055] The conveying channel 17 then extends, for example, tangent to each of the projection orifices 22.

[0056] Each projection orifice 22 has a cross-section, for example circular, rectangular, elliptical, or of another shape.

[0057] In the example in Figure 1, each orifice 22 has a rectangular cross-section, which promotes the homogeneity of the velocity fields of the water 12 at the outlet of the orifices 22.

[0058] In a variant, not shown, each orifice 22 is a slot extending along the extension direction E or extending perpendicularly to the extension direction E. In the example in Figure 1, the structure 15 comprises a plurality of projection orifices 22 aligned and spaced apart from each other along the extension direction E.

[0059] For example, each orifice 22 is separated from a neighboring orifice 22, along the extension direction E, by a first distance D1 between 100 mm and 2500 mm.

[0060] Each orifice 22 has a transverse dimension T 1 for example between 10 mm and 100 mm.

[0061] In the case of Figure 1, the transverse dimension T1 corresponds, for example, to the height of each orifice 22, taken perpendicular to the extension direction E.

[0062] Each orifice 22 generates pressure losses in the flow of water 12 between the conveying channel 17 and each orifice inlet 22.

[0063] The installation 10 includes a dissipation element 28 disposed at least opposite and downstream of each projection orifice 22, according to the direction of circulation of the water jet 12.

[0064] By "opposite", we mean that the dissipation element 28 is arranged opposite each projection orifice 22 along a projection direction R, perpendicular to the extension direction E.

[0065] In particular, the projection direction R is a direction normal to the directing surface 21. The projection direction R is, for example, a substantially horizontal direction.

[0066] For example, the dissipation element 28 is fixed to the guiding surface 21 of the structure 15 by one or more support rods 30, as illustrated in Figure 1.

[0067] Each support rod 30 is for example screwed to the guiding surface 21 of the structure 15.

[0068] Each support rod 30 is, for example, a metal rod resistant to corrosion and / or chemical and biological attacks that may occur in the installation 10.

[0069] The dissipation element 28 is located inside the internal volume of the enclosure 20.

[0070] In particular, each of the projection orifices 22 and the dissipation element 28 are totally immersed in the water 12 when the installation 10 is in operation.

[0071] The dissipation element 28 extends along the extension direction E. For this purpose, the installation 10 includes, for example, a plurality of support rods 30, spaced along the extension direction E and fixing the dissipation element 28 to the structure 15 along the entire length of the dissipation element 28.

[0072] Advantageously, the dissipation element 28 has a length D2, taken along the extension direction E, greater than the first distance D1 separating two projection orifices 22. In the example of Figure 1, the dissipation element 28 has a length allowing the dissipation element 28 to be placed opposite a plurality of projection orifices 22.

[0073] In a particular embodiment, the dissipation element 28 extends to a distance from each projection orifice 22, taken along the projection direction R, of between 2 times and 3 times the transverse dimension T1 of each projection orifice 22.

[0074] Thus, by way of example only, the dissipation element 28 extends to a distance from the directing surface 21, taken along the projection direction R, of between 200 mm and 5000 mm.

[0075] The dissipation element 28 is for example a profile extending along the extension direction E. The profile has for example a cross-section, taken perpendicular to the extension direction E, which is constant along the extension direction E.

[0076] The dissipation unit 28 is for example made of a metallic or composite material resistant to corrosion and / or to chemical and biological attacks which may occur in the installation 10.

[0077] For example, the dissipation element 28 is made of AISI 314 stainless steel, AISI 316 steel, duplex steel or glass fiber reinforced polyester.

[0078] Advantageously, the dissipation element 28 has a profile, in a plane perpendicular to the extension direction E, that is continuously differentiable over the entire profile.

[0079] Thus, between its upper edge and its lower edge, the dissipation organ 28 does not have a protruding edge that could represent a point of attachment for the fibers transported by the water 12.

[0080] According to the invention, and with reference to figure 2, the dissipation element 28 comprises a recovery structure 32 and at least one dissipation structure 34.

[0081] The recovery structure 32 is arranged opposite each projection orifice 22 along the projection direction R, and extends along the extension direction E.

[0082] In one particular embodiment, the recovery structure 32 comprises a concave face 36 and a convex face 38.

[0083] As shown in Figures 1 and 3, the concave face 36 is positioned opposite each projection orifice 22, along the projection direction R.

[0084] The recovery structure 32 then presents a profile in the general shape of C in a plane perpendicular to the extension direction E.

[0085] In a particular embodiment, in a plane perpendicular to the extension direction E, the recovery structure 32 has a symmetrical profile on either side of a median plane parallel to the extension direction E and the projection direction R, passing through a central point O of the recovery structure 32.

[0086] The center of each projection orifice 22 is, for example, aligned with the central point O of the recovery structure 32 according to the projection direction R.

[0087] The recovery structure 32, for example, has a radius R1, taken from the central point O, between 100 mm and 1500 mm.

[0088] More generally, the recovery structure 32 has a diameter, taken from the central point O, for example greater than the transverse dimension of each projection orifice 22.

[0089] As an example only, the recovery structure 32 has a diameter, taken from the central point O, between 1 and 3 times the transverse dimension of each projection orifice 22.

[0090] Each dissipation structure 34 extends the recovery structure 32 along an extension direction P perpendicular to the extension direction E.

[0091] Advantageously, the extension direction P is a vertical direction, with the dissipation structure 34 extending above or below the recovery structure 32.

[0092] For example, as illustrated in Figure 2, the dissipation organ 28 comprises two dissipation structures 34, each dissipation structure 34 extending a distinct edge 40, 41, taken along the extension direction P, of the recovery structure 32.

[0093] In particular, each dissipation structure 34 extends between an edge 49 extending the recovery structure 32 and a free edge 50, the free edge 50 being opposite the edge 49 along the extension direction P.

[0094] Each dissipation structure 34 includes at least one portion extending away from each projection orifice 22 along the projection direction R.

[0095] In the particular example of Figure 2, each dissipation structure 34 comprises a concave face 44 and a convex face 46, the convex face 46 being turned towards each projection orifice 22.

[0096] In other words, each dissipation structure 34 forms with the recovery structure 32 an S shape in a plane perpendicular to the extension direction E.

[0097] Each free edge 50 of the dissipation structures 34 then forms the portion of the recovery structure 32 moving away from each projection orifice 22 along the projection direction R.

[0098] In the example shown in Figure 2, the two dissipation structures 34 are identical and the dissipation element 28 is symmetrical with respect to its median plane. Each dissipation structure 34, for example, has a C-shaped profile between the two edges 49, 50, in a plane perpendicular to the extension direction E.

[0099] In particular, each dissipation structure 34 has a C-shaped profile, the concavity of which is reversed with respect to the recovery structure 32.

[0100] In a particular embodiment, in a plane perpendicular to the extension direction E, each dissipation structure 34 has a symmetrical profile on either side of a median plane parallel to the extension direction E and the projection direction R, passing through a central point I of the dissipation structure 34.

[0101] Each central point I is, for example, aligned with the central point O along the extension direction P.

[0102] The two dissipation structures 34 have for example an identical respective radius R2, R3, taken from the central point I, and between 50 mm and 1000 mm.

[0103] In the example in Figure 2, the radii R2 and R3 are less than or equal to the radius R1 of the recovery structure 32.

[0104] Alternatively, for example in a case where the projection orifices 22 do not have a symmetrical shape, it may be desirable that the recovery structure 32 does not have a symmetrical profile and / or that the center of each projection orifice 22 is not aligned with the central point O of the recovery structure 32 along the projection direction R. This makes it possible in particular to return the water jet 12 in a non-symmetrical way, for example in order to create a water jet returned at the top, along the extension direction P, which is larger than a water jet returned at the bottom, or vice versa.

[0105] Similarly, the dissipation structures 34 are not necessarily identical. For example, they may have different shapes and / or different radii R2, R3. The dissipation structures 34 may also have variable orientations. For example, the central points I and the central point O are not necessarily aligned along the extension direction P. For example, the central points I and the central point O may be aligned along a straight line forming an angle between 0° and 20° with the extension direction P.

[0106] In a variant, not shown, the structure 15 comprises a plurality of projection orifices 22 aligned and spaced apart from each other in a direction perpendicular to the extension direction E.

[0107] According to this variant, the dissipation element 28 extends perpendicularly to the extension direction E, so as to be positioned opposite each projection orifice 22, along the projection direction R. In yet another variant, the structure 15 comprises a plurality of projection orifices 22 arranged non-uniformly along the structure, for example, not aligned. For example, the structure 15 comprises a first row, defined along the extension direction E, of projection orifices 22, and a second row above or below the first row, along the extension direction E, of projection orifices 22. The orifices 22 of the second row are, for example, arranged exactly above or below the orifices 22 of the first row, or are arranged in a staggered pattern, that is, between two orifices 22 of the first row.

[0108] The quantity of dissipation elements 28 arranged in the installation 10 and / or the direction of extension of each dissipation element 28, are then such that the dissipation element 28 is arranged opposite each projection orifice 22, according to the projection direction R.

[0109] In another variant, not shown, the conveying channel 17 is, for example, a cylindrical channel defined by a tubular peripheral wall. The projection orifices 22 are, for example, provided on the peripheral wall and are in fluidic communication with the internal volume of the enclosure 20. Each orifice 22 is, for example, an annular orifice.

[0110] In this case, the dissipation element 28 extends along a curve of revolution around the conveying channel 17. In other words, the dissipation element 28 extends peripherally, in particular circularly around the conveying channel 17 and opposite the projection orifices 22.

[0111] Those skilled in the art will understand that the invention supports any technically feasible combination of the variants and embodiments described above.

[0112] Regardless of the embodiments and variants described above, a method for dissipating a water jet 12 implemented by the dissipating element 28 will now be described, with reference to Figure 3.

[0113] Initially, the water 12 flows in the conveying channel 17, for example in the extension direction E.

[0114] When the water 12 is at the level of the projection orifices 22, the water circulating in the conveying channel 17 pushes the water 12 through the orifices 22 and creates a jet of water passing through each projection orifice 22.

[0115] The water jet 12 is for example projected into the enclosure 20 according to the projection direction R here horizontally and perpendicular to the guiding surface 21, through each orifice 22. The jet hits the concave face 36 of the recovery structure 32, as seen in figure 3. The water 12 is then at least partially returned to the rear, i.e. towards the projection orifice 22.

[0116] The water 12 is then dissipated and / or deflected by the dissipation structure or structures 34. The water jet 12 is then dispersed in a plurality of directions.

[0117] As shown in Figure 3, the water jet 12 is for example dispersed in a plurality of directions forming a three-dimensional fan, that is to say not only backwards, but also upwards, downwards, laterally, and forwards, from the dissipation organ 28.

[0118] Water 12 is then treated in enclosure 20 for example to ensure separation between a sludge containing decanted solids, and clarified water with a lower concentration of suspended solids.

[0119] Regardless of the embodiments and variants described above, the dissipation element 28 according to the invention has many advantages.

[0120] Due to the particular structure of the dissipation organ 28, a continuous evolution of the dissipation radius of the water jet is observed at the exit of the projection orifices 22.

[0121] In other words, the dissipation element 28 has different curvatures along the recovery structure 32 and along the dissipation structure 34, facing different portions of the water jet 12. Thus, the dissipation element 28 induces different angles of deflection of the water jet 12.

[0122] The water jet is then deflected and dissipated in multiple directions, both horizontal and vertical. Indeed, the recovery structure 32 essentially directs the water jet 12 backwards, while the dissipation structures 34 unexpectedly direct the water jet 12 laterally, upwards, and downwards.

[0123] Therefore, better equidistribution and homogenization of the water jet velocity fields 12 are obtained at the outlet of the projection orifices 22 and allow efficient treatment of the fluid downstream of the projection orifices 22.

[0124] Finally, the specific geometry of the dissipation element 28 gives it a self-supporting aspect. Thus, attaching the dissipation element 28 to the structure 15 does not entail significant structural modifications to the installation 10.

[0125] It is therefore possible to switch simply and at a lower cost from a regime of high water circulation velocities in the conveying channel 17 to a regime of lower water circulation velocities in the enclosure 20.

[0126] Generally speaking, those skilled in the art will understand that such a dissipation device 28 can be implemented on any installation 10 in which it is desirable to rapidly dissipate the inlet velocities of a fluid, for example to ensure slow velocities inside the installation enclosure. Low velocities inside the enclosure optimize, for example, fluid separation (sedimentation, flotation, etc.).

[0127] Furthermore, the dissipation element 28 can be implemented in any installation 10 in which the use of deflecting elements such as grids or deflecting plates would be incompatible with the type of fluid due to the presence of fibrous or similar waste in the fluid.

Claims

DEMANDS 1. Water treatment installation (10) (12) comprising a structure (15) having at least one projection orifice (22) for a water jet (12), and a dissipation element (28) disposed opposite and downstream of at least one projection orifice (22), in the direction of flow of the water jet (12), characterized in that the dissipation element (28) comprises: a recovery structure (32) intended to be disposed opposite at least one projection orifice (22) in a projection direction of the jet (R), the recovery structure (32) extending in an extension direction (E) perpendicular to the projection direction (R), and at least one dissipation structure (34) extending the recovery structure (32) in an extension direction (P) perpendicular to the extension direction (E) and to the projection direction (R),the dissipation structure (34) comprising at least a portion intended to deviate from at least one projection orifice (22) along the projection direction (R).

2. Processing installation (10) according to claim 1, wherein the dissipation element (28) comprises two dissipation structures (34), each dissipation structure (34) extending a distinct edge (40, 41), taken along the extension direction (P), of the recovery structure (32).

3. Processing installation (10) according to claim 1 or 2, wherein the recovery structure (32) comprises a concave face (36) and a convex face (38), the concave face (36) being disposed opposite at least one projection orifice (22), along the projection direction (R), the recovery structure (32) having a C-shaped cross-section profile in a plane perpendicular to the extension direction (E).

4. Processing installation (10) according to any one of the preceding claims, wherein the dissipation structure or each dissipation structure (34) comprises a concave face (44) and a convex face (46), the convex face (46) being turned towards at least one projection orifice (22), each dissipation structure (34) forming with the recovery structure (32) an S shape in a plane perpendicular to the extension direction (E).

5. Processing installation (10) according to any one of the preceding claims, wherein the dissipation element (28) has a profile having two edges, in a plane perpendicular to the extension direction (E), continuously differentiable over the whole of the profile between the edges of the profile.

6. Processing installation (10) according to any one of the preceding claims, wherein the structure (15) comprises at least two projection orifices (22), each projection orifice (22) being separated from a neighboring projection orifice (22) by a first distance (D1), taken along the extension direction (E), the dissipation element (28) having a length (D2), taken along the extension direction (E), greater than the first distance (D1).

7. Processing installation (10) according to any one of the preceding claims, wherein the dissipation element (28) extends to a distance from at least one projection orifice (22), taken along the projection direction (R), of between 2 times and 3 times the transverse dimension (T1) of at least one projection orifice (22).

8. Processing installation (10) according to any one of the preceding claims, wherein the dissipation element (28) is a profile of constant cross-section along the extension direction (E).

9. Processing installation (10) according to any one of the preceding claims, wherein, in a plane perpendicular to the extension direction (E), the recovery structure (32) has a symmetrical profile around a median plane passing through a central point (O), the center of at least one projection orifice (22) being aligned with the central point (O) along the projection direction (R).

10. Processing installation (10) according to any one of the preceding claims, wherein the projection direction (R) extends horizontally, advantageously perpendicularly to a guiding surface (21) of the structure (15) defining at least one projection orifice (22), the extension direction (P) extending vertically.

11. A treatment installation (10) according to any one of the preceding claims, comprising a water conveying channel (17) for the water (12) to the structure (15), a chamber (20) defining an internal volume for receiving the water (12) for treatment, the structure (15) separating the conveying channel (17) and the chamber (20), the water 15 less a projection orifice (22) connecting the conveying channel (17) to the internal volume of the enclosure (20).

12. Processing installation (10) according to claim 11, wherein the conveying channel (17) extends perpendicularly to the projection direction (R).

13. Treatment installation (10) according to claim 11 or 12, wherein the installation (10) is selected from a decanter, a clarifier, or a dissolved air flotation device.

14. A method for dissipating a water jet (12) implemented by a treatment installation (10) according to any one of claims 1 to 13, the dissipation method comprising the following steps: entry of a water jet (12) through at least one projection orifice (22) of a water jet (12), recovery of the water jet (12) by the recovery structure (32), the water jet (12) being at least partially returned to the at least one projection orifice (22), and dissipation and / or deflection of the water jet (12) by at least one dissipation structure (34), the water jet (12) being dispersed in a plurality of directions.

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