EP2868821A1 - Gully with filter device - Google Patents

Abstract

Avaloir, type of road drain suitable for collecting rainwater and including runoff of road, to clean up at least part of the collected water. According to the invention, this drain comprises at least one depolluting device (50, 42) capable of retaining at least a portion of the particles in suspension in the collected water.

Description

FIELD OF THE INVENTION

This presentation relates to a gully, of the type of road gully configured to collect rainwater and to effectively cleanse the collected water.

Such a gully can be used in urban, semi-urban or rural, within a rain or unit network for example, or in isolation, and can receive both water streaming from a roadway or from a roof.

STATE OF THE PRIOR ART

Rainwater is subject to a large number of pollution sources. Part of this pollution is first of atmospheric origin, rainwater is responsible for a large number of pollutants suspended in the air (about 20% of the pollutant load). Once on the ground, on the roadway or on a roof, for example, rainwater is also responsible for other pollutants during their runoff (80% of the pollutant load): we note in particular the presence of hydrocarbons, many micropollutants (cadmium, copper, zinc ....) or macro-waste.

Given this pollution and increasing environmental concerns, particularly within city policies, it appeared necessary to provide solutions to clean up rainwater.

There are two main types of transport network for wastewater or rainwater: the unitary networks on the one hand and the separating networks on the other hand.

In unitary networks, wastewater and rainwater circulate in the same pipelines and converge on a decontamination plant downstream of the network. However, the capacity of such a plant is easily exceeded at each rainy episode, and a major part of the effluent is then directly discharged into the natural environment, without prior purification, through storm weirs in order to preserve the plant. pollution. Such a solution is therefore not satisfactory for properly treating rainwater.

Separation networks comprise a network of specific pipes for each type of water (used or rain). The wastewater is directed to the depollution plant and the rainwater is directed to the shortest and without prior operation of depollution to the natural environment. The very large number of outlets prohibits budgetally to equip downstream purification systems specifically adapted to rainwater. In addition, these facilities must be sized to be able to treat the flow of rainwater throughout the watershed, including during heavy rain events. This equipment is therefore complex and very cumbersome, which poses problems of cost and availability of land necessary for their implementation.

There is therefore a real need for an alternative solution of rainwater depollution which is devoid, at least in part, of the disadvantages inherent in the aforementioned known configurations and which adapts perfectly regardless of the nature of the networks (unitary or separative).

PRESENTATION OF THE INVENTION

The present disclosure relates to a gully, of the type of road drain adapted to collect runoff water including rainwater, comprising at least one de-polluting device capable of retaining at least a portion of the suspended particles in the collected water. This drain comprises the features of the appended claim 1.

In this specification, the term "suspended particles" is used to mean suspended particles, which are undissolved, and whose size is greater than 20 μm, which represents the largest share of the pollution load of rainwater. In addition, it is also intended to exclude large macro-waste larger than 1 cm, such as packaging for example, which can be retained on the road, that is to say outside the drain, by other ways. In addition, the term "street drains" means any type of drains provided on the road capable of collecting runoff water: in particular, these runoff waters may come from the road itself, from a roof, or from any other source.

Thanks to this device cleaning up, it is thus possible to cut down a large part of the pollution of the rainwater. The latter thus cleaned up can thus be valorized, on the spot or within a network. dedicated, or rejected in the natural environment by limiting their impact on the latter.

Thanks to this drain, the work of decontamination of the entire flow of the watershed is divided into many points each to treat a reduced flow, which is achievable in the limited volume of a drain. With a global capacity of equal pollution control, it is thus easier to implement many draining outlets rather than a single or a reduced number of stations downstream of the watershed, the latter requiring an important land in a given limited geographical area .

In addition, surprisingly, and contrary to the usual scale effects, the inventors have found that such a depocution treatment delocalized in many points in the manner proposed was less expensive than a single or a small number of decontamination stations located downstream of the watershed. In fact, such a gully is inexpensive to manufacture and requires very little civil engineering for its implementation: it therefore has a very low initial cost. In addition, unlike traditional pollution control stations installed downstream of the watershed, this drain can operate without consuming any electrical energy or reagents: therefore, its operating cost is also very low.

This distribution in many points also allows a more effective global clean-up and better adapted to the characteristics of each watershed. Indeed, the flow rates of rainwater, even during heavy rains, remain relatively low compared to the flows encountered further downstream, allowing a more effective depollution.

In certain embodiments, the drains are configured to retain at least 80% of the particles whose size exceeds 20 μm in the case of low or medium rain, ie for an inlet flow rate of less than 20. l / s, and at least 50% of these particles in case of heavy rain, that is to say for an inflow of more than 30 l / s.

In some embodiments, the drain is configured to retain at least 70%, preferably at least 80% of the hydrocarbons.

In some embodiments, the drain comprises a grid having a mesh size of less than 5 mm. In this presentation, we mean by "mesh" the average characteristic size of the sieve mesh considered. In the particular case of a sieve having regular square meshes, it is the length of the mesh side. This grid makes it possible to filter the macro-waste and the larger particles in suspension. Depending on the size of its mesh, it can constitute a self-sufficient depolluting device by retaining a large part of the particles in suspension or it can constitute a first filter to protect a second depollant device capable of retaining finer particles. Preferably, its mesh is less than 2 mm, more preferably approximately equal to 1 mm. In some embodiments, the grid extends in a subvertical plane. In the present description, the term "subvertical direction" a direction close to the vertical direction, specifically a direction forming an angle of 0 to 20 ° with the vertical direction. Such an inclination of the grid allows effective filtering while allowing the particles retained to be discharged down the grid. Preferably, this plane forms an angle of approximately 10 ° with the vertical direction.

In some embodiments, the grid comprises a canvas stretched in a frame. The use of such a fabric makes it possible to obtain a very fine grid mesh.

In some embodiments, the grid fabric essentially comprises a plastic material. This reduces the weight and cost of the grid.

In some embodiments, it is a recycled plastic. This reduces the ecological footprint of the gully and thus reinforces its environmental image.

In some embodiments, the mesh of the grid is wrinkled. This pleating, enabled by the use of a fabric, makes it possible to increase the grid surface for a small space requirement. In addition, it facilitates the sliding of the waste and particles retained along the grid and facilitates its self-cleaning.

In some embodiments, the vertices of the folds of the fabric extend in vertical planes. In this way, waste and particles can more easily slide down the grid.

In some embodiments, the pleating of the grid fabric comprises at least two different heights of pleats. It has indeed been noted that such pleating allowed better evacuation of waste and particles along the grid, thus facilitating its self-cleaning and therefore its effectiveness.

In some embodiments, the drain comprises a lamellar settling block. Such a lamellar settling block makes it possible to trap particles of size predominantly between 10 and 100 μm. The settling of the particles is favored by the lamellar structure of the block and requires neither external energy nor chemical product. In addition, such a lamellar block is self-cleaning, the retained particles being removed along the lamellae during the reflux of water. However, if necessary, the block can be easily replaced or cleaned with compressed air.

When the drain comprises a grid and a lamellar settling block, this combination makes it possible to retain at least 80% of the particles whose size exceeds 10 μm in case of low or medium rainfall and at least 50% of these particles in case of heavy rain.

In addition, the inventors have found that such a lamellar settling block made it possible to retain nearly 80% of the hydrocarbons present in the collected runoff water. In fact, the inventors have noticed that the hydrocarbons are adsorbed on the particles present in the water: therefore, by effectively filtering the particles, the lamellar settling block simultaneously carries out the filtration of the hydrocarbons. Such a block then makes it possible to simply, efficiently, and inexpensively reduce the hydrocarbons without using specific hydrocarbon treatment devices such as absorbent media, fouling quickly and requiring a now regular, or coalescing separators , very expensive and difficult to clean.

In some embodiments, the lamellar settling block comprises lamellar conduits having a honeycomb geometry. This geometry is particularly effective for decanting and retaining suspended particles. An example of adapted honeycomb geometry is given in the application EP 1 663 438 .

In some embodiments, the lamellar conduits extend in a direction at an angle of 50 ° to 70 °, preferably about 60 °, with the horizontal direction. This beach of value represents an appreciable compromise between effective particle trapping and a large passage section.

In some embodiments, the lamellar settling block has a pitch of 25 to 40 mm, preferably about 33 mm.

In some embodiments, the drain comprises an absorbent cartridge. This cartridge is particularly effective at retaining the finest particles smaller than 30 μm.

In some embodiments, the absorbent cartridge comprises a polymeric sponge.

In some embodiments, the drain comprises an inlet mouth and a first vessel; the grid is mounted across the first tank, in a subvertical plane, so as to define an upstream compartment and a downstream compartment of the first tank, the inlet mouth communicating with the upstream compartment of the first tank. In this way, the grid is a filter preventing waste and larger particles from entering the downstream compartment, the latter sliding towards the bottom of the upstream compartment of the first tank where they are stored.

In some embodiments, the face of the grid delimiting the upstream compartment of the first tank is oriented downwards. This prevents waste such as tree leaves stuck on the grid during the reflux of water.

In some embodiments, the top of the grid is inclined toward the edge of the first tank through which water enters the upstream compartment. In this way, the water that enters the upstream compartment of the first tank discharges in a direction close to that of the grid, which allows to drive down the waste remained stuck on the grid.

In some embodiments, the drain comprises a second vessel; the lamellar settling block is mounted across the second tank, so as to delimit below an upstream compartment and above a downstream compartment of the second tank, the upstream compartment of the second tank communicating with the downstream compartment of the first tank and the downstream compartment of the second tank communicating with an outlet port. During an episode rainy, the rainwater enters the first tank where they are filtered then reach the upstream compartment of the second tank located under the lamellar block; as long as water enters the drain, the water level rises in the first and second tanks until the level in the second tank reaches the lamellar block, resulting in the settling of suspended particles in the tank. water flowing through the block; the water emerging in the downstream compartment above the lamellar block is thus freed of a large part of its particles in suspension; the water thus cleaned up is discharged through the outlet orifice.

In some embodiments, the first and second tanks are separate. In other embodiments, the first and second tanks are two tank parts of the same tank: in such a case, the second tank part can extend the first tank part without a real physical boundary between the two tank parts. .

In some embodiments, the absorbent cartridge is provided across the second vessel above the lamellar settling block. It is preferably arranged on its top.

In some embodiments, the drain comprises a third tank for storing the cleaned water. This storage tank allows recovery of the cleaned water in the vicinity of the drain. This clean water can be used locally for community or private purposes: cleaning of roads, watering green spaces or private gardens, irrigation of cultivated areas, cooling sidewalks etc. In addition, when the drain is connected to a rainwater network, this storage tank can act as buffer storage so as not to saturate the sanitation system (networks and factories) in case of rainy events.

In some embodiments, the gully is configured to be connected to a rainwater network recovering the cleaned water.

In some embodiments, the drain is configured to release the water cleaned in the natural environment, in a water table or a stream for example.

In some embodiments, the downstream compartment of the first vessel includes an overflow port configured to communicate with a storm water system. Thanks to this overflow, in case Incoming water flow exceeds the treatment capacity of the drain, water does not overflow the road.

In some embodiments, the drain comprises a waste recovery channel communicating with the bottom of at least one of the tanks, preferably each tank.

In some embodiments, the drain comprises a porous drain wall. When the rain event is over, it allows the water in the drains to be slowly evacuated to dry debris and / or particles and thus limit the risk of appearance of odors.

In some embodiments, the porous wall comprises a fabric having a mesh size of less than 150 μm, preferably about 80 μm. This allows evacuation sufficiently slow to allow the normal operation of the drain during a rainy episode but fast enough to allow the evacuation of water after the rainy episode.

In some embodiments, the porous wall is at least a portion of the bottom of a tank. In such a case, the complementary part of the bottom of the tank is preferably inclined towards this porous wall.

In some embodiments, the porous wall is a wall portion of the waste collection channel.

In some embodiments, the bottom of the upstream compartment of the first tank is inclined towards the downstream compartment of the first tank, the bottom of the downstream compartment of the first tank communicating with the upstream compartment of the second tank. In this way, all the water present in the upstream compartment of the first tank flows into the second tank and can thus be finally discharged through the porous wall. The waste and particles present in the bottom of the upstream compartment of the first tank are thus also dried and therefore produce little or no odors.

In some embodiments, the drain comprises at least one level sensor equipping at least one of the tanks, this sensor being configured to communicate with a wireless network. In this way, it is possible to know remotely the water levels and / or height of waste in the drain. It is thus possible to trigger interventions maintenance if necessary. It is also possible to rationally administer the storage of the cleaned water.

In some embodiments, at least one drain element is removably mounted on rails, posts or spans and provided with at least one handle. This makes maintenance of the drain easy, especially during the cleaning of its tanks.

In some embodiments, the throat comprises a cover provided with at least one anti-circulation protection which can take the form of pads.

In some embodiments, a suction duct extends between the lid, preferably from a suction port provided in the lid, and the bottom of at least one of the tanks or the waste collection channel. . This allows easy maintenance of the drain.

In certain embodiments, the grid, the lamellar settling block and the various tanks essentially comprise recycled plastic materials. In addition to cost and mass reductions, this reinforces the environmental image of the drains.

The present disclosure also relates to a rainwater network comprising a plurality of drains according to any one of the preceding embodiments.

In some embodiments, these drains are equipped with communications means and are configured to be supervised by a network monitoring center.

The above-mentioned characteristics and advantages, as well as others, will become apparent on reading the detailed description that follows, examples of embodiments of the gully and the proposed stormwater network. This detailed description refers to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are schematic and are intended primarily to illustrate the principles of the invention.

In these drawings, from one figure (FIG) to the other, identical elements (or element parts) are identified by the same reference signs. In addition, elements (or parts of elements) belonging to different embodiments but having a similar function are shown in the figures by incremented numerals of 100, 200, etc.

The FIG 1A is a front view of a road element having a drain.

The FIG 1B is a sectional view according to the plane AA of the FIG 1A .

The FIG 2 is a sectional view of a first example of a drain. The FIG 3A is a front view of the grate of the drain of the FIG 2 . The FIG 3B is a sectional view according to plan IIIB of the FIG 3A .

The FIG 4 is a perspective view of an example of lamellar block.

The FIG 5 is a plan view of a semi-urban area equipped with drains and a rainwater network.

The FIG 6 is a perspective view partially "torn" of a second example of a drain.

The FIG 7 is a sectional view of the drain of the FIG 6 .

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

In order to make the invention more concrete, examples of drains are described in detail below, with reference to the accompanying drawings. It is recalled that the invention is not limited to these examples.

The FIG 1A and 1B are a front and sectional representation of a road element schematically: the latter comprises a roadway 11, a gutter 12 and a sidewalk 13.

Under the sidewalk 13 is disposed a drain 20 whose inlet mouth 21 opens along the sidewalk 13 at the level of the channel 12. The interior of this drain 20 is accessible from the sidewalk 13 with a lid 22 identified and protected by traffic pads 23 preventing the parking of vehicles on the drain 20.

As will be seen below, the drain 20 is configured to receive rainwater or runoff entering through its intake port 21, filter them and then evacuate through its outlet 24.

A dewatered water storage tank 25 may also equip this drain 20. The latter receives the cleaned water from the outlet 24 of the drain 20, stores it and can reject it on command (by pumping for example) in a stormwater system 26.

In such a case, a view 26 'of communication with the rainwater network 26 may for example be provided between the drain 20 and the storage tank of the cleared water 25. The tank 25 is then connected to the port of outlet 24 with a pipe 24 'whose upper portion is truncated while the eye communicates with an inlet of the rainwater network 26.

Thus, during low or moderate rain events, the cleaned water can flow via the pipe 24 between the drain 20 and the tank 25 where they are stored. On the other hand, during a rainy event of high intensity exceeding the treatment capacity of the drain 20, the untreated water overflow escapes through the overflow orifice 63 of the drain 20 and flows directly into the eye 26 ', and from there to the network 26, without contaminating the tank 25. Finally, when the storage tank 25 is full, the cleared water overflows over the truncated pipe 24' and s 'flow in the eye 26' where they are evacuated to the network 26.

Such a drain 20 is shown in more detail on the FIG 2 . It comprises a casing 29 in which are installed removable elements providing in its upper part a rainwater reception area 28, representing about the upper third of the drain 20, and in its lower part a rainwater treatment space 27 comprising a first treatment tank 30 and a second treatment tank 40.

A tank casing 39 is installed in the treatment space 27 so as to define, in conjunction with the front wall of the casing 29 of the drain 20, the first treatment tank 30. This tank casing 39 comprises side walls, a wall rear 31 and an inclined bottom 32; it is open on its front and a large part of its summit.

A grid 50 is inserted using slides in the tank housing 39 in a subvertical plane: the grid 50 is interposed over the entire height and the width of the first treatment tank 30 and thus separates an upstream compartment 30m and a downstream compartment 30v of the first treatment tank 30. In this configuration, it is therefore not possible to bypass the gate 50: all the water passing from the upstream compartment 30m to the downstream compartment 30v thus necessarily passes through the grid 50. In this example, the grid 50 extends in a plane forming an angle of 10 ° relative to the vertical; in addition the top of the grid 50 is inclined rearwardly towards the upstream compartment 30m of the first treatment tank 30.

This grid 50 is better visible on the FIG 3A and 3B . It comprises a plastic canvas stretched in a frame 52 comprising front frames 52a and 52b rear juxtaposed and assembled. The fabric 51 is fixed in the frame 52 by tongues 51a provided along its longitudinal ends and clamped between the front frames 52a and 52b of the frame 52. The frame 52 further comprises a frame of ropes or rods 53, stretched between the upper posts 52s and lower 52i of the frame 52, between which is arranged the fabric to give it a transverse profile pleated sawtooth.

As shown on the FIG 3B , the ropes or rods 53 are arranged such that this folded profile comprises an alternating series of folds in which successive small teeth 54 and large teeth 55 all extending substantially from the same plane and perpendicular thereto: the small teeth 54 have a first base width b1, here about 30 mm, and a first height h1, here about 30 mm, while the large teeth 55 have a second base width b2, here about 50 mm, and a second height h2, here about 60 mm. Thanks to this pleating, the total grid area is between 1 and 2 m ² and approximately equal to 1.4 m ² for a frame area of 0.75 m ² .

In this example, the fabric 51 is a polypropylene plastic sheeting having a square mesh of about 1 mm capable of retaining the largest macro-wastes and particles in suspension. It is also woven monofilament and thermally stabilized.

Back to the FIG 2 the top of the upstream compartment 30m of the first treatment tank 30 is open and thus communicates with the rainwater receiving space 28. The bottom of the upstream compartment 30m of the first treatment tank 30 is closed by the inclined wall 32 , the latter descending towards the gate 50 and the downstream compartment 30v. The bottom of the downstream compartment 30v of the first treatment tank 30 is itself open and communicates with a transfer passage 41 located under the first treatment tank 30 and marking the entrance into the second treatment tank 40.

The second treatment tank 40 is contiguous with the first treatment tank 30: its lateral edges are defined by the side walls of the casing 29 of the drain 20 and its front edge by the rear wall 31 of the tank casing 39; its bottom comprises an inclined wall 46.

It comprises a lamellar settling block 42 mounted in a frame 39 and disposed across the tank 40 in a substantially horizontal plane. The frame 39 is in abutment against a raised bottom portion 48 of the second treatment tank 40 so that the rear wall of the frame 39 forms the rear wall of the second treatment tank 40. In this way, the settling block lamellar 42 is interposed across the second treatment tank 40 and thus separates an upstream compartment 40m and a downstream compartment 40v of the second treatment tank 40. In this configuration, it is not possible to bypass the settling block lamellar 42: all the water passing from the upstream compartment 40m to the downstream compartment 40v necessarily passes through the lamellar settling block 42.

The structure of this lamellar settling block 42, shown schematically on the FIG 2 , is represented more faithfully in perspective on the FIG 4 . This lamellar settling block 42 comprises a network of lamellae 43 forming a plurality of parallel ducts inclined with respect to the vertical on the one hand, and with respect to the horizontal on the other hand, in order to fluidly connect the upstream compartments 40m. and downstream 40v from the second treatment tank 40 while retaining a large proportion of the particles in suspension against the walls of its lamellae 43. In this example, the lamellar settling block 42 has a honeycomb structure comprising a network of hexagonal lamellae, regular, of pitch equal to approximately 33 mm and forming an angle θ with the horizontal direction approximately equal to 60 °.

The top of the second treatment tank 40 is closed by the bottom wall 44 of a cover 60 placed on the top of the frame 49 by means of cleats 69. Thanks to these cleats 69, the rear wall of the frame 49 is not closed. not extend completely to the cover 60 so that the downstream compartment 40v of the second process tank 40 communicates with an outlet passage 45 extending along and at the back of the rear wall of the frame 49 and opening to its lower end by an outlet 24.

The inclined wall 46 of the bottom of the second treatment tank 40 descends towards a porous evacuation wall 47 disposed in this example at the transfer passage 41. This porous evacuation wall 47 comprises a folded filter cloth and stretched in a frame. In this example, the filter cloth has a mesh of about 80 microns, it may have an inclination and / or geometric shapes similar to or identical to those of the grid 50 so as to limit its clogging. In this configuration, the particles retained by the lamellar settling block 42 fall to the bottom of the second tank 40 and slide to the transfer passage 41, the latter therefore also acting as a waste recovery channel.

The rainwater receiving space 28 is provided with the intake mouth 21 through which the runoff enters the drain. In this example, the inlet mouth 21 is provided to receive the water flowing in the gutter 12; However, it goes without saying that the drain could also include, in addition to or instead of the inlet mouth 21, an inlet mouth connected to a gutter descent to recover the water flowing on an industrial roof for example. The cover 60 has an inclined upper wall 61 located under the inlet mouth 21 and down towards the upstream compartment 30m of the first treatment tank 30. The rainwater receiving space 28 further comprises a first port of overflow 62, provided in the front wall of the housing 29 of the drain 20, and a second overflow orifice 63 provided in the rear wall of the housing 29 of the drain 20.

In this example, all the elements of the drain 20 including its housing 29, its cover 22, its gate 50 and its lamellar block 42 are made of plastic materials, preferably recycled.

The operation of the drain 20 will now be described with reference to the FIG 2 . During a rainy episode, the rainwater is received in the drain 20 by the inlet mouth 21 and is directed through the inclined wall 61 of the cover 60 to the upstream compartment 30m of the first treatment tank 30: the waters then pass through the gate 50 to pass into the downstream compartment 30v; on this occasion, the macro-wastes as well as the largest particles in suspension are retained by the grid 50 and are deposited at the bottom of the upstream compartment 30m of the first treatment tank 30.

As the drain 20 continues to receive runoff water, the filtered water from the downstream compartment 30v of the first tank 30 enters the upstream compartment 40m of the second process tank 40 through the transfer passage 41. The mesh of the porous evacuation wall 47 is configured in such a way that the evacuation rate escaping through this porous wall 47 is small relative to the admission flow entering the diverter 20 when a rainy episode.

Therefore, as the rainy episode continues, the water rises in the drain 20, and in particular in the second treatment tank 40, until reaching the lamellar settling block 42 and the downstream compartment 40v of the second When the water passes through the lamellar settling block 42, a large majority of the particles in suspension having a size greater than 10 μm are retained and are deposited at the bottom of the second treatment tank 40. The waters which reach the 40v downstream compartment are thus virtually free of suspended particles whose size exceeds 10 microns: these cleared water then overflow over the rear wall of the frame 49, flow into the outlet passage 45 and out of the drain 20 by the outlet port 24.

From that moment, the drain 20 has reached its steady state and continuously cleans up the runoff water received. However, in the event of a thunderstorm, for example, when the intake flow exceeds the treatment capacity of the drain 20 (of the order of 30 L / s), the water level can continue to rise in the 20 to the level of the overflow orifices 62 and 63. In such a case, the excess water can be discharged through the overflow orifices 62 and 63 and be discharged into a rainwater network. or a conventional wastewater system.

At the end of the rainy episode, the intake flow entering the drain 20 decreases until it is canceled. Therefore, the water contained in the drain 20 progressively escapes through the porous evacuation wall 47. In particular, the inclined wall 32 of the bottom of the upstream compartment 30m of the first treatment tank 30 directs the water remaining in the upstream compartment 30m towards the downstream compartment 30v and therefore transfer passage 41 provided with the porous evacuation wall 47. In the same way, the inclined wall 46 of the bottom of the second treatment tank 40 directs the water remaining in the second treatment tank 40 towards the porous wall 47. After a certain time, the residual water is thus completely removed from the drain 20: no stagnant water is left at the bottom of the tanks 30 and 40 where the waste and the particles retained are stored. which limits their fermentation and therefore the appearance of odors.

To facilitate drainage through the porous drain wall 47, the drain may be installed on a bed of sand or other draining material.

In order to maintain the performance of the drier over time, it can be cleaned regularly. To do this, the cover 22 of the drain 20 can be removed in order to access the different elements of the drain 20. In particular, most of the elements of the drain 20 are removably mounted on rails, uprights or bearings 64 of housing 29; they can also be equipped with handles 65 facilitating their removal. In this example, this is particularly the case of the grid 50, the tank housing 39, the cover 60, the frame 49 carrying the lamellar settling block 42, the cover 60 and the porous evacuation wall 47. The grid 50 and lamellar settling block 42 can thus be easily removed for cleaning. Waste stored at the bottom of tanks 30 and 40 can also be easily removed by suction.

Such a drain 20 is capable of retaining at least 80% of particles whose size exceeds 10 microns in case of low or medium rainfall and at least 50% of these particles in the event of heavy rain.

The FIG 5 illustrates examples of the use of the gully 20 in a semi-urban district 70. In the example presented here, some gutters 20a are provided with a depolled water storage tank 25 for feeding on site , or in the immediate vicinity of the drain 20a, equipment requiring water: it may be for example watering devices 72 of a field 71. Such an isolated drain 20a can also reject the cleaned water in the natural environment, by infiltration for example.

Other drains 20b do not have a depolluted water storage tank 25 and directly discharge the cleaned water into a rainwater network 26. In such a case, the cleaned water can be used elsewhere in the city, for example by example to feed a fountain 73.

Other drains 20c are still equipped with depolluted water storage tanks 25 for the purpose of supplying local equipment, a watering device 72 of a football field 74 for example, but are also connected to the rainwater network 26 In such a case, the water storage tank depolluted 25 of such a drain 20c can be controlled remotely, or according to a preprogrammed routine, to store the cleaned water, supply local equipment 72 or supply the rainwater network. 26, depending on the level of water in the tank for example, a pre-established schedule, or the immediate needs of the rainwater network 26.

Finally, other drains 20d are devoid of local equipment supplied with water but are nonetheless connected to the rainwater network 26 via a depolled water storage tank 25: the latter then ensures a buffer storage so as not to saturate the rainwater network 26 in case of heavy rains for example. Such a tank 25 can also be controlled remotely or according to a preprogrammed routine.

The FIG 6 and 7 illustrate a second example of embodiment of a throat 120. This throat 120 comprises elements similar to the first example of the throat 20: there is thus an intake mouth 121, an overflow orifice 162, a first treatment tank 130 provided with a gate 150 separating upstream compartments 130m and downstream 130v, a second treatment tank 140 provided with a lamellar settling block 142 separating upstream compartments 140m and downstream 140v, and a porous evacuation wall 147. Despite a different disposition of these elements with respect to each other, the operation of this second example of drain 120 is quite similar to that of the first example of drain 20. Only the specificities of this second drain 120 relative to the first drainer 20 will therefore be described below.

A first specificity of this drain 120 relates to the depolled water storage tank 125 which is here an integral part of the body of the drain 120. In fact, in this example, the water storage tank depolled 125 is included inside the housing 129 of the drain 120, under the treatment space 127: in particular, the side and bottom walls of the tank for cleaning the cleaned water 125 are formed by the walls of the housing 129 ; its upper wall is formed by the inclined wall 146 forming the bottom of the second treatment tank 130 and the bottom wall of the waste recovery channel 180.

In this example, the downstream compartment 140v of the second treatment tank 140 communicates with an outlet passage 145 opening at its lower end into the depolled water storage tank 125, the latter itself being provided with an outlet port 124.

Another specificity of this drain 120 relates to the recovery of the waste which is stored in a waste recovery channel 180 common to the first and second treatment tanks 130 and 140. This channel 180, located at the lowest point of the space of treatment 127, is provided at its lower end with the porous evacuation wall 147 allowing the drainage of the treatment tanks 130 and 140. In this example, the porous evacuation wall 147 is lateral.

The waste recovery channel communicates with the upstream compartment 130m of the first tank 130 through an opening 133 made in the lowest portion of the inclined wall 131 forming the bottom of the upstream compartment 130m: therefore, during the reflux of the water, the water remaining in the upstream compartment 130m escape through this opening 133 carrying the waste and the particles retained by the grid 150.

The channel also with the downstream compartment 130v of the first tank and the upstream compartment 140m of the second tank through an opening 134 formed at the lower end of the side wall 135 of the downstream compartment 130v of the first tank 130: thus, during the water reflux, the water remaining in the downstream compartment 130v of the first tank 130 and the upstream compartment 140m of the second tank 140 escape through this opening 134 by driving the particles retained by the lamellar settling block 142. All the waste and particles retained by the drain 120 are thus stored in the same place, which facilitates the maintenance of the drain 120 and are dried through the porous evacuation wall 147, which limits odors.

In addition, thanks to this opening 133 made in the bottom of the first treatment tank 130, the waste recovery channel 180 is directly accessible from the outside once the cover 122 is open: such a vertical duct free of obstacles allows to suck the waste without having to dismantle the elements of the drain 120.

Finally, it may be noted that the cover 122 of this second example comprises two longitudinal flaps 122a and 122b articulated by hinges 190 mounted around a single central axis in the form of a longitudinal tube 191. Each flap 122a, 122b takes further support in closed position on a longitudinal tube 192. These three tubes 191 and 192 further allow a mechanical reinforcement of the cover 122 to better withstand the weight of pedestrians or vehicles stopping on the cover 122.

The modes or examples of embodiment described in the present description are given for illustrative and not limiting, a person skilled in the art can easily, in view of this presentation, modify these modes or embodiments, or consider others, while remaining within the scope of the invention.

In addition, the various features of these modes or embodiments can be used alone or be combined with each other. When combined, these features may be as described above or differently, the invention not being limited to the specific combinations described herein. In particular, unless otherwise specified, a characteristic described in connection with a mode or example of embodiment may be applied in a similar manner to another embodiment or embodiment.

Claims (14)

Avaloir, of the type of road drain, adapted to collect runoff water and especially rainwater, comprising at least one depolluting device (50, 42) adapted to retain at least a portion of the particles suspended in the collected water, characterized in that the decontaminating device comprises a grid (50) and a lamellar settling unit (42). Diverter according to claim 1, wherein the grid (50) has a mesh less than 5 mm, preferably less than 2 mm, more preferably approximately 1 mm. The diverter of claim 2, wherein the grid (50) comprises a stretched fabric (51) in a frame (52). Diverter according to claim 3, wherein the web (51) of the grid (50) is folded, the vertices of the folds (54, 55) of the web (51) extending in vertical planes. An outlet according to claim 4, wherein the pleating of the wire (51) of the gate (50) comprises at least two heights (h1, h2) different from the folds (54, 55). An outlet according to any one of claims 1 to 5, wherein the lamellar settling block (42) comprises lamellar conduits (43) having a honeycomb geometry, and
wherein the lamellar ducts (43) extend in a direction forming an angle (θ) of 50 ° to 70 °, preferably about 60 °, with the horizontal direction. Diverter according to any one of claims 1 to 6, comprising an intake mouth (21) and a first tank (30),
wherein the grid (50) is mounted across the first vessel (30), in a subvertical plane, so as to delimit a compartment upstream (30m) and a downstream compartment (30v) of the first tank (30), the inlet mouth (21) communicating with the upstream compartment (30m) of the first tank (30). Diverter according to claim 7, comprising a second tank (40),
in which the lamellar settling block (42) is mounted across the second tank (40), so as to delimit below an upstream compartment (40m) and above a downstream compartment (40v) of the second tank ( 40), the upstream compartment (40m) of the second tank (40) communicating with the downstream compartment (30v) of the first tank (30) and the downstream compartment (40v) of the second tank (40) communicating with a port of output (24). Diverter according to any one of claims 1 to 8, comprising a third tank (25) for storing the cleaned water. Diverter according to any one of claims 7 to 9, comprising a porous evacuation wall (47). An outlet according to claim 10, wherein the porous wall (47) comprises a web having a mesh size of less than 150 μm, preferably about 80 μm, and
wherein said fabric is pleated. Diverter according to any one of claims 1 to 11, comprising at least one level sensor equipping at least one of the tanks (30, 40, 25), this sensor being configured to communicate with a wireless network. Diverter according to any one of claims 1 to 12, wherein at least one element of the drain (20) is removably mounted on rails, posts or spans (64) and provided with at least one handling handle (65). Rainwater network characterized in that it comprises a plurality of drains (20) according to any one of the preceding claims.

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