WO2019043327A1

WO2019043327A1 - Air filtration device

Info

Publication number: WO2019043327A1
Application number: PCT/FR2018/052110
Authority: WO
Inventors: Vincent FESQUET; Christophe JENARD; Anne RONDEAU
Original assignee: Mvaw Technologies
Priority date: 2017-09-01
Filing date: 2018-08-28
Publication date: 2019-03-07
Also published as: FR3070608B1; FR3070608A1

Abstract

An air filtration device (1) comprising a filling (2) supporting microorganisms and plants (20), a forced air circulation system (3) provided with at least one air suction or blowing mouth (4), and a water circulation circuit (5). The filling (2) is associated with a shaper (6) for forming a vertical continuous filtering wall (7) partially delimiting a cavity (8), the device (1) comprising means for closing the cavity (8) comprising a closing wall (101) provided with the mouth (4) and in bearing contact with said continuous filtering wall (7). The shaper (6) comprises two permeable membranes (61, 63) each forming, with a frame (62, 64), the inner face (71) and outer face (72) of said continuous filtering wall (7), the filling (2) formed from a mass of organic and/or mineral elements being interposed between said membranes, the outer membrane (63) receiving the plants (20).

Description

AIR FILTRATION DEVICE

FIELD OF THE INVENTION

The invention relates to an air filtration device. It relates more particularly to an air filtration device comprising a culture support of microorganisms and plants called packing, a forced air circulation system provided with at least one suction mouth, or respectively, blowing of air, and at least one water circulation circuit configured to allow irrigation of said lining and / or humidification of the air.

PRIOR ART

Air filtration devices by forced air through a filtering plant wall incorporating the aforementioned lining are known as illustrated for example US2014 / 0228345. In this prior patent, the filtering plant wall is a cylindrical wall which extends in the erected state, that is to say substantially vertically, in the configuration of use of the device. This filtering plant wall partially delimits a cavity supplied with air by means of a perforated tube extending, inside the cavity, over the entire height of the cavity. In such a filtration device, the particles contained in the air are trapped in the lining of the filtering plant wall and the volatile organic compounds contained in the air are degraded by the microorganisms of the lining and converted into nutrients for the benefit of plants implanted in the filtering wall. This principle is common to this type of air filtration devices. However, the device as described in US2014 / 0228345 is unsatisfactory because it is of complex construction and can not work in suction mode. Her design forces to work in blowing mode, that is to say to blow the air inside the cavity defined by the filtering plant wall, this air then being purified during its escape from the cavity by passing through the filtering vegetation wall. Conversely in suction mode, the air is sucked into the cavity after passing through the filtering plant wall and then escapes from the cavity. As a result, the air that enters the cavity is purified air which limits the fouling of the cavity. In addition, the design adopted in the aforementioned US patent makes it very difficult to obtain a homogeneous air flow inside the cavity defined by the filtering wall, and its implementation involves simple shapes.

PURPOSE AND SUMMARY

An object of the invention is to provide an air filtration device whose design allows operation in blowing mode or suction mode at the choice of the manufacturer by making extremely simple adaptations of the device.

Another aim of the invention is to propose a filtration device whose design simultaneously makes it possible to trap the particles and degrade the gaseous pollutants in a single pass. Another object of the invention is to provide an air filtration device whose design allows homogeneity of the air circulating inside the cavity.

To this end, the subject of the invention is an air filtration device comprising a culture support for microorganisms and plants called packing, a forced air circulation system provided with at least one suction mouth. or respectively of air blowing, and at least one water circulation circuit configured to allow the irrigation of said lining and / or the humidification of the air, characterized in that the lining is associated with a shaper for forming a so-called filtering continuous wall, extending in the erected state in the configuration of use of the device, and partially delimiting at least one cavity, in that the device comprises means for closing the cavity delimiting, in cooperation with the continuous filtering wall, the internal volume of a chamber, in that said means for closing the cavity comprise at least one so-called closure wall connected to the continuous filtering wall and in bearing contact with said continuous filtering wall, this wall closure being provided with the or at least one of the suction mouths, or respectively, of air blowing the forced air circulation system for a circulation inside said chamber of an air adapted to be purified by passing through the filtering continuous wall, and in that the shaper comprises at least two membranes permeable to air and water each provided with an armature, said membranes known int upper and outer respectively forming, in cooperation with their armature, the inner and outer faces of said continuous filter wall, the lining which comprises at least one cluster of organic and / or inorganic elements being interposed between said inner and outer membranes, the membrane outer being configured to allow the passage of plants through said membrane and the at least partial insertion of said plants in the lining.

The realization of the closing wall provided with the suction mouth or air blowing in the form of a wall in bearing contact with the filtering wall allows, at this level, the closure of the cavity in an easy manner. The simplified design of the mouth integrated in the closure wall allows a homogeneity of the air inside the cavity, especially in blowing mode and the possibility of using the same mouth indifferently in blowing mode or in suction mode. The production of each of the faces of the filtering wall in the form of a membrane / reinforcement combination finally gives the filtering wall a high mechanical strength while ensuring self-maintenance of said faces. filtering wall in upright position.

The use of a lining at least in the form of a cluster, that is to say of bulk materials, makes it possible to easily vary the nature of the lining, the filling level of the lining receiving volume. extending between the inner and outer membranes and the density of the filling to vary at will the air permeability of this filling

According to one embodiment, each suction mouth, or respectively of air blowing, is arranged in recess, or outcrop or substantially flush, of the so-called internal face, that is to say facing towards the inside the chamber, the closing wall.

By substantially flush, it is meant that the suction mouth, or respectively the air blower, extends in projection of at most 5 cm from the so-called internal face, that is to say facing towards the inside the chamber, the closing wall.

Thanks to this simplified design of the mouth which can be formed by a simple section of duct opening at one of its ends into the cavity, and connected by its other end to the forced air circulation system formed for example by a fan, it results in the possibility of operating in blowing mode and in suction mode without having to modify the design of the mouth while keeping a homogeneity of the flow of air in the chamber.

According to one embodiment of the invention, the means for closing the cavity comprise a cap capable of closing the top of the cavity, this cap being provided with a fallen edge surrounding the inner membrane / armature assembly associated in the part high of said assembly, in the erected state of the filtering continuous wall and closed cavity by said cap. Preferably, the cap has the shape of a hollow body open on the top side of said body, the dropped edge of the cap extending below the bottom face of the body. The design of the cap avoids the development of preferential air path at the upper part of the continuous filter wall. This cap can also be used as a storage chest or receiving equipment. Finally, this cap allows easy access to the interior of the cavity without disassembling the entire device.

According to one embodiment of the invention, the means for closing the cavity comprise a lid closing the cavity from above, the lid being provided with a peripheral edge surrounding the outer membrane / associated armature assembly in the upper part of said cavity. together in the erected state of the filtering continuous wall and closed cavity by said cover, this cover closing the open top face of the hollow body constituting the cap. This cover allows a better control of the moisture content of the lining by limiting the evaporation of water, or unwanted water inputs. This cover can be used as a support for various equipment, such as lighting, measuring device or monitoring physico-chemical parameters or other.

According to one embodiment of the invention, the filtering continuous wall, which extends to the erect state in the configuration of use, rests by its base on a liquid collecting tray, the bottom of the tray being provided with minus a through orifice of liquid discharge.

According to one embodiment of the invention, the device comprises a collection tank for at least a portion of the irrigation water from the water circulation circuit, the collection tank being in fluid communication with the tank. manifold for a supply of liquid from the collecting tank from said collecting pan.

According to one embodiment of the invention, the filtration device comprises a technical room, preferably adjacent to the chamber defined at least partly by the filtering continuous wall. This technical room can adjoin laterally the room and / or be positioned below or above the room.

According to one embodiment of the invention, the filtration device comprises a rolling chassis of which at least a portion is disposed plumb and below the chamber. This results in an air filtering device easily transportable.

According to one embodiment of the invention, the lining receiving volume extending between the inner and outer membranes is divided into at least two compartments.

Preferably, the lining receiving volume extending between the inner and outer membranes is, for its division into at least two compartments equipped with a partition extending substantially parallel to the inner and outer faces of said continuous filter wall, this partition being formed of at least one membrane permeable to water and air and a reinforcement.

The possibility of dividing the reception volume of the lining makes it possible to use different types of packings or to vary the irrigation at each of the compartments.

According to one embodiment of the invention, each armature / membrane assembly is a self-supporting assembly and preferably the armature of at least one of the assemblies is a grid. This results in simplicity in terms of assembly and disassembly of the device. According to one embodiment of the invention, the lining, permeable to air, has a thickness of between 10 and 40 cm, and in that the cluster of organic and / or mineral elements forming at least a part of the packing is in the form of particles and / or fibers. BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which:

FIG. 1A represents a partial perspective view in exploded position of the elements constituting it of a filtration device according to the invention;

Figure 1 B shows a partial perspective view in the assembled state of the constituent elements of a filter device according to the invention; 2 shows a partial sectional view of a filter device according to Figures 1A and 1B, the receiving volume of the lining being undivided;

3 shows a partial sectional view of a filter device according to Figures 1A and 1B, the receiving volume of the lining being compartmentalized;

FIG. 4 represents a partial view of a filtration device according to FIGS. 1A and 1B, in the exploded position of the elements;

Figure 5 shows a schematic cross-sectional view of a filter device according to Figures 1A and 1B; and Figure 6 shows a partial sectional view of another embodiment of a filter device according to the invention.

DETAILED DESCRIPTION As mentioned above, the invention relates to a device 1 for filtering air by passing said air through a filtering plant wall 7 of said device 1. Such a filtration device 1 can be implanted inside a construction, such as a building. Such a filtration device 1 can also be arranged outside to filter the ambient outside air.

In the case of use in connection with a construction, such a filtration device 1 can operate indifferently as follows, namely:

the air is taken inside the building and then, after passing inside the device 1, released inside the building, the air is taken inside the building then, after passing through the building, inside the device 1, released outside the building,

the air is taken outside the building and, after passing inside the device 1, released inside the building,

The passage of air through the filtration device 1 allows trapping of a portion of the particles of air and volatile organic compounds (VOCs) by degradation of these compounds by means of the microorganisms present in the filtering vegetable wall 7 these compounds being transformed into plant nutrients.

In the filtration device 1, which is the subject of the invention, it is possible to observe, in a single passage of air, a simultaneous reduction of 80% of the fine particles greater than one micrometer and at least 80% of the VOCs.

Such a filtration device 1 makes it possible to treat between 300 and 700 m ³ of air per hour for a filtering vegetation wall with a surface area of approximately 6 m ² .

This filtration device 1 comprises a microorganism and plant culture support 20, hereinafter referred to as a lining 2. This lining 2 is associated with a shaper 6 to form the continuous filter wall 7 vegetal or vegetated. This continuous filter wall 7, said vertical, extends in the erected state in the configuration of use of the filtration device 1, that is to say that it rests with its edge on the rest of the filtration device 1 . This filtering continuous wall 7 comprises an internal face, represented at 71 in the figures, and an external face, represented at 72 in the figures. The detail of the design of this continuous filter wall 7 will be provided hereinafter.

This filtering continuous wall 7 is configured, that is to say, shaped and dimensioned to partially delimit a cavity 8, that is to say a geometric hollow shape. The device 1 also comprises means 10 for closing the cavity 8 to delimit, in cooperation with the continuous filtering wall 7, the internal volume of a chamber shown at 9 in the figures. The filtering device 1 further comprises a forced air circulation system 3 which forces the air to pass through the chamber 9 and the continuous filter wall 7 of partial delimitation of the chamber in a direction depending on the operating mode (blowing or suction ) retained.

Indeed, the forced air circulation system 3 generally comprises a fan associated with at least one sheath. This forced air circulation system 3 is provided with a mouth 4 opening on the chamber 9. According to the operating mode, suction or blowing of the fan disposed outside the chamber 9, the mouth 4 constitutes a mouth 4 blowing air into the chamber 9 or a mouth 4 suction air chamber 9.

In the blowing mode, the air blown out of the blower is forced, through the mouth 4 which forms the outlet of the blower, to circulate in the chamber 9 by blowing from said mouth 4 before being discharged from the filtration device 1 to through the filtering continuous wall 7. In the suction mode, the air is forced to flow through the continuous filter wall 7 before entering the chamber 9. The air is sucked out of this chamber 9 by passage through the mouth 4 which is connected to the fan which sucks air from chamber 9 before releasing it into the environment.

The filtration device 1 can therefore operate in suction mode or in blowing mode according to the installation configuration of the fan.

The filtration device 1 further comprises a water circulation circuit 5 configured to allow the irrigation of the lining 2 and / or the humidification of the air.

To allow optimal filtration, it is necessary that the closure of the chamber 9 operates in good conditions to avoid the formation of preferential air flow paths.

Similarly, the design of the continuous filter wall 7 is essential to allow optimal filtration of the air while obtaining a filtration device 1 simple to mount and maintain.

In the examples shown, the means 10 for closing the cavity 8 comprise a closing wall 101 connected to the wall 7 and in bearing contact with the continuous filter wall 7. In the embodiment shown in FIGS. 1A to 4, the chamber 9 is a chamber of parallelepipedal general shape. This chamber 9 comprises a top face, a bottom face and four lateral faces. Three of the side faces of the chamber are formed by the continuous filter wall 7. By continuous wall 7 is meant that the wall is without interruption from one end to the other of the wall to avoid the creation, at these levels. interruptions, preferential air flow path.

The 4 ^th side face of the chamber is formed by the wall 101 of closure which is pressed against the vertical free edges of the filter wall at this level, the closure wall may be welded against the vertical edges of the filtering wall. Alternatively, this closure wall may be provided with slides or equivalent within which the free vertical edges of the filter wall are inserted.

In the embodiment shown in FIG. 6, the filtering continuous wall 7 is a cylindrical wall of circular cross section with a vertical axis and the closing wall 101 forms the bottom face of the chamber 9. In this embodiment, the continuous filter wall 7 rests, by its lower free edge, on the closing wall 101. Connecting means, such as clamps or brackets, may be provided between the filtering continuous wall and the closure wall 101 for holding the filtering continuous wall 7 in position. As a variant, the continuous filter wall 7 delimiting a closed perimeter could have been of any cross section.

Regardless of the embodiment chosen, the closure wall 101 is provided with the suction or air blowing mouth 4 of the forced air circulation system 3 for circulation inside the chamber 9 of a chamber. air capable of being purified by passing through the continuous filtering wall, this passage through the filtering continuous wall 7 operating upstream or downstream of the flow of air inside said chamber 9 as mentioned above .

In the examples shown, the fan of the forced air circulation system 3 is disposed outside the chamber 9 and pressed against the outer face of the closure wall 101, that is to say the face of the closing wall 101 facing the outside of the chamber 9. The suction suction mouth 4 is arranged flush with the inner face of the closure wall 101, that is to say the face turned towards the inside room 9 of the closing wall 101. Equivalently, this mouth 4 could have extended back from the internal face of the closing wall 101 or substantially flush, that is to say projecting at most 5 cm from the inner face of the wall 101 closing, that is to say the face facing the interior of the chamber 9 of the closing wall 101. Thus, all the rest of the space in the chamber 9 is free for a homogeneous distribution of the air inside the chamber 9.

Likewise, regardless of the embodiment chosen, the filtering continuous wall 7 comprises, as mentioned above, a lining 2 and an associated shaper 6. The shaper 6 comprises two membranes 61, 63 permeable to air and water each provided with an armature 62, 64, said inner and outer membranes 61 61 forming respectively, in cooperation with their armature 62 and 64, the faces internal 71 and outer 72 of the filter wall 7 continuous. The membranes may be of the same nature or of a different nature. In the examples shown, the outer membrane 63 is a non-woven fabric of geotextile type and the inner membrane 61 is a metal fabric in the form of a lattice.

The outer membrane 63 is configured to allow the passage of plants 20 through said membrane 63 and the at least partial insertion of the plants 20 in the lining 2 interposed between said membranes. Thus, the outer membrane 63 may be pre-cut or cut on site in pre-marked or user-selected locations and a plant is introduced into each cut, so that the roots of the plant may be inserted into the packing interposed between said membranes 61 and 63 and which will be described below.

The outer membrane 63 may also, alternatively, have sufficient porosity for the introduction of the plants 20 without cutting. Each frame / membrane assembly is a self-supporting unit. In the examples shown, each armature, namely the inner armature 62 and the outer armature 64, is in the form of a grid. The membrane may be attached to the associated armature by any means, such as gluing, stapling or other.

Alternatively, the membrane and frame may by design be preassembled to form a one-piece assembly.

The lining 2 which comprises at least one cluster of organic and / or inorganic elements is interposed between the inner and outer membranes 61 and 63. The receiving volume of the lining 2 extending between the inner and outer membranes may be undivided as in the example of Figure 2 or compartmentalized as in the example of Figures 3 and 6.

Thus, in the example of FIGS. 3 and 6, the reception volume of the lining 2 extending between the inner and outer membranes 61 and 63 is divided into two compartments, and is, for its division, equipped with a 16 s partition. extending substantially parallel to the inner 71 and outer 72 faces of said continuous filter wall 7.

This partition 16 is formed of a membrane permeable to water and air and a reinforcement of the same nature as the membrane / armature assemblies described above.

The lining 2 is permeable to air and has a thickness of between 10 and 40 cm.

The cluster of organic and / or inorganic elements constituting the packing 2 is in the form of particles and / or fibers. In particular, in the example shown, the lining 2 comprises fibers of plant origin such as coconut fibers, and expanded rocks such as perlite. As a variant, the lining may be partly or exclusively form other elements such as synthetic compounds or ceramic elements. By way of example, these synthetic compounds may be in the form of polypropylene beads.

To complete the closure of the chamber 9, the closing means of the cavity 8 comprise a cap 102 adapted to close the top of the cavity 8. This cap 102 is provided with a dropped edge 1021 surrounding the inner membrane assembly 61 / associated armature 62 in the upper part of said assembly in the erected state of the filtering continuous wall 7 and closed cavity by said cap 102. In the examples shown, this cap 102 has the shape of a hollow body 1022 open side face from above said body 1022. This opening is shown at 1023 in the figures. The falling edge 1021 of the cap 102 extends below the bottom face 1024 of the body 1022. The embodiment of the cap 102 in the form of a hollow body makes it possible to use it as an equipment storage area.

The means for closing the cavity 8 also comprise a lid 103 closing the cavity 8 from above. The lid 103 is provided with a peripheral edge 1031 surrounding the outer membrane / armature assembly 64 associated in the upper part of said assembly. the erected state of the filtering and closed continuous wall 7 of the cavity 8 by said cover 103. This cover 103 closes the open top face of the hollow body 1022 constituting the cap 102. The cap 102 is therefore interposed between the cover 103 and the cavity 8.

Again, and independently of the embodiment, the continuous filter wall 7 which extends in the upright state in use configuration rests with its base on a liquid collector tank 1 1. The bottom of the tray 1 1 is provided with at least one through orifice 12 for discharging liquid.

In the example shown in Figure 6, the tray 1 1 collector and the closing wall 101 are formed by the same part. In the example shown in FIGS. 1 to 4, the collector bin 1 which forms the bottom face of the chamber 9 is independent of the closing wall 101 which forms a side wall of the chamber 9.

In addition, the filtration device 1 comprises a technical room 14 adjoining the chamber 9 delimited at least partially by the filtering continuous wall 7. This technical room 14 can be disposed at least partially below the chamber 9 and / or next to the chamber 9 as illustrated in FIGS. 1A and 1B. In a variant, this technical room could have been placed above the chamber 9. In the examples shown, the filtering device 1 further comprises a rolling frame of which at least a part is disposed above and below the chamber 9. This rolling frame formed of a mechanically welded assembly carries the constituent elements of the chamber 9 and form the bottom face of a part of the technical room 14. As mentioned above, the filtration device 1 further comprises a circuit 5 for circulating water. This water circulation circuit 5 is provided with connection means to a pump 17 fitted to said circuit and / or to an external water supply.

In the examples shown, the water circulating circuit 5 is equipped with a pump 17 and the device 1 comprises a control unit 18 of the pump 17. This circuit 5 is formed in particular of irrigation pipes which are arranged to flat on the upper face and / or at different heights in the continuous filter wall 7 for a gravity flow of water in the continuous filter wall 7. The water is collected in the lower part of the continuous filter wall 7 in the tank 1 1 liquid collector and is removed from this tray through the orifice 12 through the outlet of the tray 1 1 collector to be collected in a tank 13 of collection.

This collection tank 13 is in fluid communication with the tank 1 1 collector for the recovery of irrigation water from the circulation circuit 5 water. On this portion of the circuit between tank 1 1 collector and collection tank 13, a filter and a strainer can be arranged to allow treatment of the recovered water. The collection tank 13 here houses the pump 17 which is a submerged pump. Thus, the water collected can be reinjected into the water circulation circuit 5 at a flow rate chosen by the control unit 18 which controls the operation of the pump 17.

Alternatively, a simplified pump-free water circulation circuit may be provided. A controlled solenoid valve opens or closes the water circuit. The water collected from the irrigation is then discharged outside the filtration device 1 via an overflow device.

Note that in the examples shown, the collection tank 13 housing the pump is also equipped with an overflow 19 for security purposes.

The operation of such a filtering device is as follows: If the operation chosen is the blowing mode, the fan of the forced air circulation system 3 sucks the outside air, the blast via the blowing mouth 4 into the chamber 9 where this air is discharged from the chamber 9 through the continuous filter wall 7. When passing through the continuous filter wall 7, the air is purified as mentioned above by cooperation of the effects of the lining, plants, and microorganisms contained in the lining.

If the chosen operation is the suction mode, the fan of the forced air circulation system 3 draws air contained in the chamber 9 via the suction mouth 4. This aspiration thus generates the passage of air, outside the chamber 9, into the chamber 9 via the continuous filter wall 7 before exhausting the chamber 9 by the suction mouth 4. Again the air is purified by passing through the continuous filter wall 7.

This purification of the air by passing through the filtering continuous wall 7 is thus carried out upstream or downstream of the circulation inside said chamber 9 according to the mode of operation blowing or suction retained.

The operating mode blowing or suction of the device 1 is defined by the manufacturer by connecting the mouth 4 to respectively the air outlet or the air inlet of the fan. The design of the mouth 4 allows to use it for both modes of operation.

Generally, the residence time of the air in the lining 2 of the continuous filter wall 7 is between 1, 8 and 15 seconds depending on the thickness of the lining 2 and the rate of passage of the air in this lining. 2.

Because of the realization of at least a portion of the lining in the form of bulk materials, it is easy to vary this residence time.

The mounting of the filtration device 1 is extremely easy. It suffices, for example, in the case of the embodiment of Figures 1 to 4, to position on the chassis 15 rolling tray 1 1 collector and then position on this tray 1 1 manifold armatures 62, 64 pre-equipped respectively their membranes 61, 63 for the production of the continuous filter wall 7. Maintaining in the erected state of the armature / membrane assemblies at a given location on the surface of the tray 1 1 collector can be operated using clamps equipping the bottom of the tray 1 1, these clamps coming to pinch the armature / sets membrane. The closing wall 101 is also put in place to close the end of the continuous filter wall 7 under construction. The lining 2 can then be introduced between the membranes 61, 63 of the armature / membrane assemblies. Note that each time, the membrane is disposed between the interior of the chamber 9 and the armature to which it is associated. It is interesting to note that the outer armature 64 associated with the outer membrane 63 is disposed outside the outer membrane 63 because it allows at least partial protection of said outer membrane 63. The irrigation pipes of the circuit 5 irrigation can be put in place before or as the filling is filled. The top of the chamber 9 is then closed by placing the cap 102 and the cover 103 by simple interlocking. The elements of the technical room 14 are installed on the rolling chassis. The filtration device 1 is then ready for operation. The method of construction of the filtration device 1 with a cylindrical chamber is similar except that the closure wall 101 and the collector tank 1 1 form a single element so that it is not necessary to closing one of the side faces of the continuous filter wall 7, the latter already delimiting a closed perimeter.

Claims

1. An air filtration device (1) comprising a microorganism and plant culture support (20) called a lining (2), a forced air circulation system (3) provided with at least one mouth (4) of air suction or respectively of air blowing, and at least one circuit (5) of water circulation configured to allow the irrigation of said lining (2) and / or the humidification of the air, characterized in that the lining (2) is associated with a shaper (6) to form a so-called filtering continuous wall (7), extending in the erected state in the configuration of use of the device, and partially delimiting at least one cavity (8), in that the device (1) comprises means (10) for closing the cavity (8) delimiting, in cooperation with the continuous filter wall (7), the internal volume of a chamber (9), in that said means (10) for closing the cavity (8) comprise at least one so-called closure wall (101) connected to the wall (7) c filtering device and in bearing contact with said continuous filter wall (7), this closure wall (101) being provided with the or at least one of the suction or blowing mouths (4) respectively. of the forced air circulation system (3) for circulating inside said chamber (9) an air capable of being purified by passing through the continuous filter wall (7), and in that the shaper (6) comprises at least two membranes (61, 63) permeable to air and water, each provided with an armature (62, 64), said inner (61) and outer (63) membranes forming respectively, in cooperation with their armature (62, 64), the inner (71) and outer (72) faces of said continuous filter wall (7), the lining (2) which comprises at least one cluster of organic elements and / or minerals being interposed between said inner (61) and outer (63) membranes, the outer membrane (63) being configured to allow passing plants (20) through said membrane (63) and at least partially inserting said plants (20) into the lining (2).

2. Device (1) for filtering air according to claim 1, characterized in that each mouth (4) suction, or air blowing respectively, is disposed recessed or flush or substantially flush with the so-called inner face, that is to say facing the inside of the chamber (9), the wall (101) closing. 3. Device (1) for air filtration according to one of claims 1 or 2, characterized in that the closing means of the cavity (8) comprises a cap (102) adapted to close the top of the cavity ( 8), this cap (102) being provided with a fallen edge (1021) surrounding the inner membrane assembly (61) / armature (62) associated in the upper part of said assembly, in the erected state of the wall (7). ) continuous filtration and closed cavity (8) by said cap (102).

4. Device (1) for filtering air according to claim 3, characterized in that the cap (102) has the shape of a hollow body (1022) open on the top side of said body (1022), the flanged edge (1021) of the cap (102) extending below the bottom face (1024) of the body (1022).

5. Device (1) for air filtration according to claim 4, characterized in that the closing means of the cavity (8) comprises a cover (103) closing from above the cavity (8), the cover (103). ) being provided with a peripheral edge (1031) surrounding the outer membrane assembly (63) / armature (64) associated in the upper part of said assembly in the erected state of the continuous wall filtering wall (7) of the cavity (8) by said cover (103), which cover (103) closes the open top face of the hollow body (1022) constituting the cap (102).

6. Device (1) for filtering air according to one of claims 1 to 5, characterized in that the filter wall (7) continuous, which extends to the erect state in the configuration of use, rests by its base on a tray (1 1) liquid collector, the bottom of the tray (1 1) being provided with at least one orifice (12) through liquid evacuation.

7. Device (1) for air filtration according to claim 6, characterized in that the device (1) comprises a reservoir (13) for collecting at least a portion of the irrigation water from the circuit ( 5) of water circulation, the collection tank (13) being in fluid communication with the collector tank (1 1) for a liquid supply of the collection tank (13) from said collector tank (1 1).

8. Device (1) for air filtration according to one of claims 1 to 7, characterized in that it comprises a room (14) preferably adjoining the technical chamber (9) delimited at least partially by the wall (7) continuous filtering.

9. Device (1) for air filtration according to one of claims 1 to 8, characterized in that it comprises a chassis (15) rolling of which at least a portion is disposed to the plumb and below the room (9).

10. Device (1) for air filtration according to one of claims 1 to 9, characterized in that the receiving volume of the lining (2) extending between the inner (61) and outer (63) membranes is divided into at least two compartments.

1 1. An air filtering device (1) according to claim 10, characterized in that the receiving volume of the lining (2) extending between the inner (61) and outer (63) membranes is, for its division into at least two compartments equipped with a partition (16) extending substantially parallel to the inner (71) and outer (72) faces of said continuous filter wall (7), this partition (16) being formed of at least one membrane permeable to water and air and a frame. 12. Device (1) for air filtration according to one of claims 1 to 1 1, characterized in that each armature assembly (62, 64) / membrane (61, 63) is a self-supporting assembly and in that, preferably, the armature (62, 64) at least one of the sets is a grid.

13. Device (1) for air filtration according to one of claims 1 to 12, characterized in that the lining (2), permeable to air, has a thickness of between 10 and 40 cm, and in that the cluster of organic and / or inorganic elements forming at least a part of the packing is in the form of particles and / or fibers.

14. Device (1) for air filtration according to one of claims 1 to 13, characterized in that the circuit (5) water circulation is equipped with a pump

(17) and in that the device (1) comprises a control unit (18) of the pump (17).