EP2605642A1

EP2605642A1 - System for the long-term storage of marine worms

Info

Publication number: EP2605642A1
Application number: EP11757907.8A
Authority: EP
Inventors: Michel Lopuszanski
Original assignee: Normandie Appats SAS
Current assignee: Normandie Appats SAS
Priority date: 2010-08-18
Filing date: 2011-08-16
Publication date: 2013-06-26
Also published as: FR2963871A1; WO2012022860A1; FR2963871B1

Abstract

The present invention relates to a system (1) for the long-term storage of marine worms (2), including at least one stack (3) of plastic trays (4, 10, 11) for holding the marine worms and provided with a turned-out rim (7), and comprising means (8, 9) for the so-called upper tray (10) to engage with a so-called lower tray (11). The system comprises means (14) for supplying water (15) from the tray stack recirculated from the bottom of the pile, and means (17) for recovering and raising said water for said supply. The engagement means (8, 9) are arranged to enable the trays to be nested within one another at a height h or h/_ which is predetermined to be greater than 1/5^th of the height of the tray, by providing an annular space (19) having a constant or substantially constant width i or i/_ between the opposite walls of the nested trays, each tray (4) comprising, in the upper portion of a sidewall, at least one overflow opening (20) connected to the top of the annular space.

Description

LONG-TERM CONSERVATION SYSTEM FOR SEAWAYS

The present invention relates to a long-term preservation system for sea worms, comprising at least one stack of worm retention trays and means for supplying recycled water from the stack from above.

It also relates to a method of long-term preservation of seaworms by automatic water filling of trays stacks.

The invention finds a particularly important, although not exclusive, application in the field of the packaging of live worms having the ability to sneak through orifices of small size, for example having a diameter of 2 to 3 mm.

Such worms are used as live bait for recreational fishing.

Already known (FR 2 847 767) devices for packaging aquatic organisms to delay the deterioration of the health of worms, so as to prevent them from reaching the lethal state too quickly.

It is thus known a storage system in a stack of substantially parallelepiped trays having an upper edge and having support grids constituting abutment means of an upper tray on a lower tray to prevent any embedding of one of the trays. in the other and thus automatically creating a room between the two funds of stacked trays clean to receive live worms.

Means for supplying recycled water from the tray from the top of the stack and recovery by pump for rising water are provided.

Such a device which is effective in a number of conditions nevertheless has drawbacks.

Indeed, if the overflow holes located on the upper side of the trays are too small, these holes are clogged.

On the other hand, if these holes are made larger to facilitate the passage of the water without clogging, the experiment shows that the worms can escape at the same time as the water of which they follow naturally and intuitively the current.

In addition, the batteries are of low stability and occupy a large volume.

The present invention aims to overcome these disadvantages.

Thanks to the invention it will be possible to embed the trays into one another while protecting the inlet and outlet orifices of the running water of the risk of leakage of worms, which solves the recurring problem. escape of worms, and this while proposing an environment close to their natural environment.

It becomes possible to use enlarged overflow holes that facilitate the passage of water, oxygen and waste, without the possibility of leakage for worms through the use of a narrow annular space, for example 0.7 mm wide, structurally created between the flanks of the stacked trays.

The narrowness of the annular space is such that the worms can not slip to reach the outlets of the running water.

However, this narrow space does not prevent the water from circulating to bring oxygen to the worms and evacuate the waste without risk of obstruction.

Thanks to the invention, worms could be stored for several months in their sales packaging.

Each tray can become self-contained with or without a lid and can be removed from the piles as and when needed without any special procedure, which limits the cost of time spent by retailers, who have little time to spend handling worms. and their packaging, being absorbed by their counter sales activity.

The present invention therefore makes it possible to provide a preservation system which better than those previously known to the requirements of the practice, in particular by enabling optimized storage of worms in a limited space without the consumption of water in self-draining trays. stackable into each other, easily grasped and stored in groups in a package and most of which, including the last one, are covered with a cover to prevent the worms from being locked (due to the respect of the dimensions and stacking). A possibility permanent rinsing and re-wetting of the supports is also provided with the invention.

For this purpose, the present invention essentially proposes a long-term preservation system for seaworms of minimum diameter greater than a determined value, comprising at least one stack of trays for retaining said seaworms, of plastic, substantially parallelepipedic, of section lateral and transverse isosceles trapezoidal directed downwards, each of said trays having an upper edge provided with a rim, and having means for abutting the so-called upper tray on a so-called lower tray, arranged to provide a worm retention space between the lower face of the bottom of the upper tray and the upper face of the bottom of the lower tray,

said system comprising means for supplying recycled water from the stack of trays by the top of the stack, and means for recovering and raising said water, for said supply, characterized

in that the abutment means are arranged to allow the interlocking of the trays one inside the other over a height h or h_ determined greater than 1/5 th of the height of said tray, by providing an annular space of width constant or substantially constant 1 or 1 _ ^ _ between the walls of the trays nested opposite, said width being less than said determined value and in that each tray has at least one overflow port in the upper part of a side wall leading to the top of the space annular, said orifice being of diameter greater than the determined value.

The determined value is for example 1 mm; 1.5 mm; 2.5 mm or 3 mm. The term minimum diameter refers to what a worm can take when it sneaks and can be three to five times smaller than its nominal diameter.

Advantageously, the borders are arranged to channel and / or sufficiently protect the flow of water outside the side walls of the upper tray in the lower tray.

The annular space is of width less than a determined value, corresponding to the minimum diameter of sea worms.

In other words, the value determined is such that the worms placed in the boxes can not pass into the interstices between two boxes and exit. It is for example between 0.3 mm and 1.5 mm, for example 0.4 mm, 0.5 mm or 0.7 mm.

The overflow orifices are for their part 2 mm to 1 cm in diameter, for example 3 or 4 mm in diameter.

Here the diameter must instead be sufficient to allow a good flow of water, with a flow rate and with a rate of renewal sufficient to cause the disposal of waste, and a good oxygenation of live worms. All things being equal, such an orifice is necessarily greater than the minimum diameter of the worms.

Thus the large but narrow area of the annular space allows a renewed renewal rate then through the orifice and / or the overflow orifices while blocking the passage of worms, which otherwise would have escaped with the flow of flow of the fountain.

To further improve the good renewal of the water in each tray, important to optimize the survival of the worms, the overflow holes of two successive trays are for example positioned in the opposite way in the pile to automatically create a flow of water crossing each of the trays.

In advantageous embodiments, one and / or the other of the following provisions is also used:

the system comprises means for treating the recycled water;

each tray of the cell has external tabs perpendicular to its walls, distributed along its upper periphery arranged to form the stop means when the upper tray is directly fitted into the lower tray over the height h determined;

the outer tabs have lower centering lugs of the upper tray nested in the lower tray, adapted to maintain constant the width of the annular space in all circumstances;

the system comprises at least one tray cover, with a substantially parallelepipedal recess, provided with oblique walls terminated in the upper part by stop means at the upper part of the annular space or by a peripheral rim of shape complementary to that of a tray, adapted to hang so as to allow a nesting of the upper tray in the lower tray on height h / _ determined while providing an annular space of width d between the outer walls of the lid and the inner walls of the lower tray opposite in which it is fitted and a space d_ between the inner walls of the lid and the outer walls of the upper tray opposite, to form the total width 1__, said cover being adapted to form the means of stops between the two said lower and upper trays successive stack and comprising at least one hole pierced in the bottom;

- The upper part of the walls of the trays and / or the cover or lids, connection with their respective rim, includes a flow deflector chamfer clean channeling the flow of water from an upper tray in the lower tray;

- The bottom of said lid comprises means for supporting the bottom of a tray from above entirely at a distance from the bottom of the lid by providing a space of width e between the bottom wall of the lid and the lower walls of said tray above;

the support means comprise at least one longitudinal boss;

- The support means comprise four vertical abutment lugs, centered on each of the respective walls of the lid;

- the system includes several stacks of trays and a water drain pan located in below said stacks, provided with a gravity flow orifice or spout towards the means for recovering and treating the water;

each tray rim comprises a periphery perpendicular to the bottom and located entirely at a distance from the outer face of the side walls, extending downwards over a height of between 1/4 and 2/3 of the height of said tray, said rim comprising said outer tabs perpendicular to the walls of the tray and longer than the height of said rim;

said tabs comprise in the lower part a downward centering triangle shape;

each tray rim comprises four rounded corners each provided with a notch open at the bottom defining a hooking lip of a closure lid, said lip being located near the top of said rim;

the half angle at the top of the sides of the isosceles trapezoids of the trays and / or covers sections is between 2 ° and 7 °, for example 5.4 °;

the upper face of the bottom of the tray has at least one portion projecting from said face.

The invention also proposes a method of long-term storage of seaweeds by automatic filling in water of seaweed packaging containers of minimum diameter greater than a determined value,

in which a stream of continuous water or drip water is discharged at a predetermined rate into at least one stack of trays, qualified successively and respectively upper tray and lower tray, comprising said live worms located between the bottom face of the bottom of an upper tray and the upper face of the bottom of a lower tray, the water flowing overfull respectively of an upper tray in a lower tray, and recovers and then reinjects from above said water recovered from below, for said feed, characterized

in that the trays are nested one inside the other over a determined height by providing an annular space of width 1 substantially smaller than said determined value between the walls of the trays opposite,

the excess water is evacuated from an upper tray in a lower tray by an overflow orifice of diameter greater than said value determined in the upper part of a side wall opening at the top of the annular space of the upper tray , by gravitational channeling the flow of water outside the side walls of a tray in the tray below, thanks to a rim of the periphery of trays forming baffle water flow that fills the space lower ring

and the recycled water is treated.

By substantially less is meant two to ten times lower, for example three to five times lower.

In the embodiment more particularly described, the value determined is that of the diameter of the hole through which sea worms have the capacity to to flee rather easily by sneaking into said small hole, for example a hole diameter of 2 to 5 mm, for example 3 mm, said leakage diameter.

Thus a marine worm such as the Arenicolary, 1 cm in diameter is it capable, surprisingly, out through a hole 3 mm in diameter by constricting the body at the hole.

Advantageously, at least one upper tray is placed on a tray lid, substantially parallelepipedal recess, provided with oblique walls terminated in the upper part by a peripheral rim of complementary shape to that of a tray on which it is itself,

the overfilled water is evacuated from the upper tray into said lid through said annular space, one wall of which is the inner face of the container, and

the lid is simultaneously gravitarily emptied, substantially at the determined flow rate, into the lower tray by an orifice pierced in said lid.

The present invention will be better understood on reading the following description of embodiments given as non-limiting examples.

The description refers to the accompanying drawings in which:

Figure 1 is a schematic sectional view of the system according to the invention.

Figures 2A and 2B are partial side sectional views showing the interlocking of two trays according to two embodiments of the invention. FIG. 3 illustrates the circulations of water on two trays stacked according to the embodiment of the invention more particularly described here.

Figure 4 is a partial perspective view showing the support means according to an embodiment of the invention.

Figure 5 is a side view of a tray used with a system according to one embodiment of the invention.

Figure 6 is a side view of a cover used with a system according to another embodiment of the invention.

Figure 7 is a perspective view of the lid of Figure 6.

FIG. 8 gives an example of a stack of two trays with lids, for storage according to one embodiment of the invention.

FIG. 9 is a general diagram of a system according to one embodiment of the invention comprising several stacks of trays.

Figure 1 shows a conservation system 1 for sea worms 2 comprising a stack 3 of worm retention trays 4 and / or a substrate 5 such as sand.

Each tray is of substantially parallelepipedal plastic, of trapezoidal and lateral cross-section isosceles directed downwards.

It presents (see also FIGS. 2A, 2B, 3 and 4) an upper edge 6 provided with a rim 7 and comprises abutment means 8, represented in FIGS. 1, 2A and 2B by a cover which will be detailed below. after and / or by pins 9 in case of absence of cover (see Figure 4), the so-called upper tray 10 on the so-called lower tray 11, arranged to provide a retention space worms between the lower face 12 of the bottom of the upper tray 10 and the upper face 13 of the bottom of the lower tray 11.

The system 1 comprises means 14 for supplying recycled water 15 of the stack 3 of trays through the top 16 of the stack and recovery means 17 and raising 18, for example by means of a submerged pump, water for said feed.

The abutment means 8, 9 are arranged to allow the interlocking of the trays one inside the other over a determined height h or h ', greater than one fifth of the height H of the tray, height measured between the upper face of the tray rim and the underside of the bottom of the tray.

These abutment means are arranged to provide an annular space 19 of constant or substantially constant width 1 or 1 (see Figures 1 or 2A) between the walls of the trays nested opposite.

In other words, the anti-leakage and anti-clogging system according to the embodiment of the invention more particularly described here has two types of assembly, namely a type where the two trays are embedded one inside the other creating directly the narrow annular space (0.5 to 1 mm wide) in front of the hole or hole of the overflow, inaccessible to the worms but not to the water and waste, and a type where an intermediate cover of hollow shape is interposed between the two trays to create the annular space in front of the hole.

Each tray further includes, advantageously at least two such orifices 20 overflow in the upper part of a side wall opening at the top of the annular space, the rim 7 being adapted to channel the flow 21 of the water outside the side walls of the upper tray in the lower tray, for example by being sufficiently overdrawable and / or having a clearance space forming a guide channel.

In Figure 1 there is shown an embodiment of the stop means of the upper tray in the lower tray formed by a cover provided with hooking means 22 formed by a superimposing edge hooking the lid on the upper edge of the edge 6 in rim 7.

In Figures 2A and 2B is shown in section the upper peripheral edge of a lower tray 11 in the two embodiments more particularly described herein.

FIG. 2A shows the case of a cover 8 hooked to the rim 7, a space d for example of 2 mm being provided between the side wall 11 'and the lateral oblique panel 8' of the recess of the cover, the distance between the wall 11 of the lower tray and 10 'of the upper tray, being for example 3 or 5 mm.

The bottom 10 '' of the upper tray rests on two bosses with longitudinal parallel ribs 8 '' in the bottom of the lid the attachment being such that the tray 10 sinks a height h 'in the tray 11.

FIG. 2B shows another embodiment of the cover 8 forming the abutment means of a tray 10 on the other 11.

Here the distances d between lower tray and lid and d_ between lid and lower tray are for example of the same order as for the embodiment of Figure 2A.

The cover is instead provided here with reinforcements or angles C in the form of a triangle whose oblique face facing outwards rests on the bevel F formed at the upper part of the periphery of the annular space, to suspend the cover.

Reinforcements in the form of a square plate B, for example four in number, arranged centrally on each face, are provided to support the tray 10 above.

FIG. 3 shows a stack of two trays, namely the upper tray 10 on a lower tray 11 without a lid, the means 9 for abutment of one tray in the other being this time formed by external tabs 23 perpendicular to these walls distributed along the upper periphery.

More precisely and with reference to FIG. 4, this periphery 6 thus extends downwards over a height e corresponding, for example, to one-third of the height H of the tray.

The rim 7 comprises the stiffening lugs 23 perpendicular to the rim and of length e 'greater than the height e of the rim so that when the upper tray 10 is nested in the lower tray 11, the tabs bear on top of the lower rim and provide the retention space worms and their support between the underside of the upper tray 10 and the face upper of the lower tray 11. An empty gap in baffle width 1. between the volume of air trapped between the sides and the outside trays is thus provided.

The tabs 23 are regularly distributed along the rim for example and advantageously two tabs on either side of each corner and a lug centered on each of the longitudinal and transverse rim portions of the walls of the box.

In one embodiment the rim 7 has four corners 24 each provided with a slot 25 open downward defining a hooking lip 26 near the top of the rim.

The stiffening tabs 23 comprise in the lower part a downwardly centering triangle-shaped portion when a tray is engaged in the other.

The angle of the isosceles trapezoids in the embodiment more particularly described here is, for example, 3 degrees.

The upper face 13 of the bottom of the tray advantageously has one or two longitudinal portions 27 protruding from the face, for example with a thickness of 3 to 5 mm so as to arrange all around this portion in substantially parallelepipedic projection of the channels of equal length and width equal to one-third close to that of the portions, the channels being located between said portions in projection and the walls and adapted to provide a central channel.

According to the embodiment of the invention more particularly described here, each tray has in the upper part of its side wall orifices 20 for example 4 mm square by 4 mm as also appears in Figure 5 which is a lateral figure of tray 4 at a distance of for example 3 mm from the upper edge of the box, and symmetrically placed on one side of the tray, for water flow.

FIGS. 6 and 7 show another embodiment of abutment means of an upper tray on the lower tray. This is another type of hollow lid 26, substantially parallelepipedal, but having longitudinal and transverse trapezoidal sections that is to say provided with oblique walls 27 terminated at the top by a peripheral edge provided with external angles. 31 complementary shape to that of the chamfer 32 of the edge of the tray in which it is placed, and suitable for installation by allowing a nesting of the upper tray in the lower tray on the height h 'while sparing the space annular width d between the outer walls of the lid (see Figure 2B) and the inner walls of the bottom tray opposite in which it is fitted, and a space d between the inner walls of the lid and the outer walls of the upper tray opposite to form a total width the, said cover being adapted to form abutment means between said successive lower and upper trays of the stack and comprising at least one orifice 32 pierced in the bottom 33.

The lid 8 therefore does not have a rim here, but on the one hand lugs or angles 31 distributed evenly along the periphery, which will make it possible to rest on the rim of the lower tray, and on the other hand means 34 for supporting the bottom of the tray which comprise at least one longitudinal boss and / or four stop tabs, in the form of vertical rectangular blades, centered on each of the respective walls of the lid, of height e side, such that x = e + h '+ the thicknesses of the respective bottoms concerned are greater than the distance between the bottom of the hole 20 and the upper face of the rim.

Two symmetrical trapezoidal holes 36 placed on one side of the cover are provided at the same level as the top of the stops 35, for example with a bottom 7 mm from the edge.

FIG. 8 shows a stack of two trays provided with these intermediate supports 4 using this type of lid without a flange, the periphery 37 of which then disappears in the plane 38 of the top of the rim 7.

FIG. 9 shows another embodiment of a system 40 according to the invention, which comprises several stacks 41 of trays 42 in greater or lesser number and a fried water-cleaning machine 43 situated beneath said stacks. , provided with an orifice or spout 44 of flow gravitating towards the recovery means 45 of the water and treatment 46.

The recovery means comprise, for example, a submerged pump 47.

The water treatment means are in turn formed in a manner known per se, and comprise two tanks 48, 49 in series, namely a first tank 48 for the recovery of water 50 at the outlet of the fried nib, comprising a first granular layer or granular filter 51, itself placed above a layer of oyster shells and / or other shells.

The water escapes from the first tank at the bottom (arrow 53) to penetrate from above into the second tank 49, and evacuate by overflow at 54, after passing through a second shell filter 55 and a mechanical and / or chemical filter 56, for example coal.

The water thus treated ends in the tank 57 of recyclable water and is taken up by the pump 47 to supply via a pipe 58 and the hoses 59 the nozzles 60 for feeding the batteries drip. The nozzles are slidably mounted between a high position, for a large pile and a low position for a small pile, in guides 61, being held for example by friction in the chosen position.

The invention also proposes a method of long-term conversation of worms by automatic filling in water of packaging trays of the type described above.

The operation of the device 40 of FIG. 9 will now be described by making more particularly with reference to this figure as well as to FIG.

A set of stacks 41, for example at least three stacks, of trays 42 in which the worms 2 have been previously installed directly or in layers 62 of substrate, is placed on a support piece. The stack of boxes preventing the worms to pass through the orifices, and this both for the lower openings, which allow the flow of water from one tray into the other, that for the annular space whose dimensions e, 1, 1 ', are arranged to be smaller than the dimensions of the worms.

Worms can not migrate and leave boxes.

A flow is then carried out, for example dropwise, but also from a single continuous stream, at least one water renewal per hour contained in each tray, several renewals per hour being preferred, which will allow immersion of the worms in the water that enters the first tray, then back too full to the outlets 20, before descending into the tray below being guided through the peripheral edge, which here plays the role of chute.

The water then falls between the space inside the next tray and goes down on the other side opposite the hole, the holes being arranged in opposition so as to constrain the water to pass through each tray. for the benefit of the worms by ensuring them a good supply of oxygen and a good evacuation of waste products. After passing through all the trays successively, the water arrives at the bottom to be recovered by the fried nib, treated in the tanks 48 and 49 and then taken again by means of the pump 47.

As goes without saying and as it follows from the foregoing, the present invention is not limited to the embodiments more particularly described. On the contrary, it embraces all the variants and in particular those in which the trays are transparent, the treatment is different and / or the number of openings is greater than two, or the stop means of a tray on the other are formed differently. for example by means of internal walls of a determined regular height distributed or by corner pillars.

Claims

1. System (1) for long-term preservation for sea worms (2) of minimum diameter greater than a determined value, comprising at least one stack (3) of trays (4, 10, 11) for retaining said worms, of substantially parallelepipedal plastics, with an isosceles trapezoidal lateral and transverse cross-section, each of said trays (4) having an upper edge (6) provided with a rim (7), and comprising means (8, 9) abutment of the said upper tray (10) on a so-called lower tray (11), arranged to provide a worm retention space between the lower face of the bottom of the upper tray and the upper face of the bottom of the lower tray,

said system comprising means (14) for supplying recycled water (15) to the stack of trays from above the stack, and means (17) for recovering and raising said water, for said feed, each container (4) having at least one orifice (20) of overflow in the upper part of a side wall opening at the top of the annular space, characterized

in that the abutment means (8, 9) are arranged to allow the trays to fit into each other over a given height h or h 'greater than 1/5 th of the height of said tray, in providing an annular space (19) of constant or substantially constant width 1 or 1 between the walls of the nested containers screw, said width being smaller than said determined value,

and in that the overflow orifice has a diameter greater than the determined value.

2. System according to claim 1, characterized in that the width of the annular space is between 0.3 mm and 1.5 mm and the overflow orifice is of diameter between 2 mm and 1 cm.

3. System according to claim 1, characterized in that the determined value is 1.5 mm.

4. System according to claim 1, characterized in that the system (1) comprises means (46) for treating recycled water.

5. System according to any one of the preceding claims, characterized in that each tray (4) of the cell comprises tabs (23) external perpendicular to its walls, distributed along its upper periphery arranged to form the means (9). ) of abutment when the upper tray (10) is directly fitted into the lower tray (11) over the height h determined, said tabs (23) having outer lower centering pins of the upper tray nested in the lower tray.

6. System according to any one of the preceding claims, characterized in that it comprises at least one lid (8) tray, hollow (26) substantially parallelepiped, provided with oblique walls (27) terminated in the upper part by a rim device of complementary shape to that of a tray, adapted to hang on allowing a nesting of the upper tray (10) in the tray lower (11) on the height h_ determined while providing an annular space (19) of width d between the outer walls of the lid and the inner walls of the lower tray opposite in which it is fitted and a space d / _ between the inner walls of the lid and the outer walls of the upper tray opposite, to form the total width 1 _ ^ _, said cover being adapted to form the abutment means between the two said lower and upper trays successive stack and comprising at least one pierced hole in the bottom.

7. System according to any one of the preceding claims, characterized in that the upper part of the walls of the trays and / or the or lids, connection with their respective rim, comprises a self-baffling flow deflector to channel the flow water from an upper tray in the lower tray.

8. System according to any one of claims 6 and 7, characterized in that the bottom of said cover comprises means (8 '', 35) for supporting the bottom of a tray above entirely remote from the bottom of the cover. providing an annular space of width e between the inner walls of the lid and the outer walls of said tray above.

9. System according to claim 8, characterized in that the support means comprise at least one longitudinal boss (8 '').

10. System according to claim 8, characterized in that the support means comprise four legs Vertical abutment (35), centered on each of the respective walls of the cover.

11. System according to any one of the preceding claims, characterized in that it comprises several stacks (41) of trays and a drain pan (43) for water recovery located below said stacks, provided with a gravity flow orifice towards the means of recovery and treatment of water.

12. System according to any one of the preceding claims dependent on the 5, characterized in that each rim (7) tray (4) has a periphery perpendicular to the bottom and located entirely at a distance from the outer face of the side walls, s extending downwards to a height between 1/4 and 2/3 of the height of said tray, said rim comprising said external tabs perpendicular to the walls of the tray and longer than the height of said rim.

13. System according to claim 12, characterized in that said tabs comprise in the lower part a downward centering triangle shape.

14. System according to any one of claims 12 and 13, characterized in that each rim (7) tray has four corners (24) rounded each provided with a notch (25) open downward defining a lip of hooking (26) a closure lid, said lip being located near the top of said rim.

15. System according to any one of the preceding claims, characterized in that the upper face of the bottom of the tray has two longitudinal portions (27) projecting from said face.

16. A method of long-term preservation of seaworms by automatically filling the water of seaweed packaging containers (4) with a minimum diameter greater than a predetermined value, in which a trickle of water or water drip at a predetermined rate on at least one stack (41) of trays (42), qualified successively and respectively upper tray and lower tray, comprising said live worms located between the bottom face of the bottom of a upper tray and the upper face of the bottom of a lower tray, the water flowing too full respectively of an upper tray in a lower tray, and recovers and then reinjects from above said water recovered from below , for said supply, characterized

the excess water is discharged from an upper tray into a lower tray by an overflow orifice (20) of diameter greater than said value determined in the upper part of a lateral wall opening at the top of the annular space ( 19) of the upper tray, by gravitational channeling the flow of water outside the side walls of a tray in the tray below, thanks to a rim of the periphery of the trays forming the deflector of the water flow which fills the lower annular space,

and the recycled water is treated.

17. The method of claim 16, characterized in that at least one upper tray (10) is placed on a lid (8) tray, recessed substantially parallelepiped, provided with oblique walls terminated in the upper part by a peripheral shape of rim complementary to that of a tray on which it is itself,

the lid is simultaneously gravitarily emptied, substantially at the determined flow rate, into the lower tray by an orifice (32) pierced in said lid.