ES2643018T3 - Waste storage and leaching system - Google Patents

Abstract

Waste storage system (2) comprising: - a storage tank (4), and - an upper container (6) arranged in the tank (4) and intended to collect waste, characterized in that it comprises - a lower container (8 ) liquid-tight disposed in the tank (4) and placed under the upper container (6), the lower container (8) comprising a lid (12) having at least one hole (14) and having a suitable shape for direct liquids to the hole (14) by gravity.

Description

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DESCRIPTION

Waste storage and leaching system

The invention relates to the technical field of waste storage systems with deposit, specifically with buried deposit, according to the preamble of claim 1. A waste storage system of this type is known from EP A-2 284 105.

A storage system of this type generally comprises a concrete tank at least partially buried in which a waste container suitable for housing the waste is arranged. When it is desired to empty the storage system, simply empty the container, for example by removing it from the tank, pouring the contents into a dump truck and putting it back into the tank.

The waste in question is, for example, household waste, kitchen waste, green waste, cardboard or paper containers, or glass, to name just a few examples. Some of these wastes are wet, and therefore a liquid is likely to ooze from this waste. This liquid is often referred to as leachate. Since the bottom of the container is not perfectly tight, a part of the leachate generally flows out of the container towards the bottom of the tank. Because, generally, it is not planned to empty the deposit, the leachate accumulates at the bottom of the deposit and generates olfactory discomfort for the users of the storage system. In addition, hygiene problems may arise as a result of the accumulation of leachate at the bottom of the tank.

To alleviate this problem, a solution may be to purge and regularly clean the bottom of the tank. But this needs the intervention of important human and material resources.

On the other hand, it can be interesting to be able to recover the leachate, since, generally, it is rich in minerals and thus forms a very good complement for agricultural methanization solutions.

An objective of the invention is to prevent the leachate that oozes from the waste from flowing to the bottom of the deposit and to recover it.

For this, according to the invention, a waste storage system is provided comprising:

- a storage tank,

- an upper container disposed in the warehouse and intended to collect waste, and

- a lower liquid-tight container arranged in the tank and placed under the upper container,

the lower container comprising a lid that has at least one hole and that has a suitable way to direct the liquids to the hole by gravity.

Thus, the leachate that oozes from the waste located in the upper container and that crosses the bottom of the upper container falls into the lid of the lower container. The shape of this lid allows the leachate to flow by gravity into the hole and therefore into the lower container. Thus, it is guaranteed that the leachate that escapes from the upper container flows to the lower container and not to the tank, the bottom of which remains therefore clean. On the other hand, when the leachate is stored in the lower container, it is possible to recover it for later recovery.

Advantageously, edges of the hole in the lid of the lower container are extended by retaining walls that extend substantially vertically downwards.

Thus, the malodorous vapors from the leachate stored in the lower container are partially blocked by the retaining walls, which makes it possible to limit the emission of bad odors outwards from the lower container.

Advantageously, the upper and lower containers are removable.

In this way, it is easy to purge the containers, since it is enough to remove them from the tank, empty them and put them back in the tank.

Advantageously, the upper container comprises a bottom that has at least one hole and that has a suitable way to direct the liquids towards the hole by gravity.

In this way, the leachate present in the upper container is directed towards the lower container. In this way, leachate accumulates less in the upper container, which reduces the emission of bad odors.

Preferably, the hole of the upper container is located in front of the hole of the lower container.

The leachate thus flows directly from the upper container to the lower container. In this way, it is

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less susceptible to drying on the lid of the lower container.

Advantageously, in a plane in vertical section, the lid of the lower container has the same general section as a funnel.

Advantageously, the lid of the lower container is formed by two walls inclined towards the hole of the lower container.

The lid of the lower container thus presents a simple form. This lid is therefore easy to manufacture.

Advantageously, the storage system further comprises connection means for pumping means of the liquid present in the lower container.

Thus, when it is necessary to empty the lower container, it is sufficient to connect a pump to the connection means and pump the leach out of the lower container.

According to an embodiment of the invention, the lower container is formed by a sealed membrane arranged on a grid support.

Thus, the grid support keeps the membrane in shape to accommodate the leachate flowing from the upper container. When the membrane is either worn or full, it is enough to remove it and replace it with a new membrane. According to this embodiment, the lower container can be easily exchanged.

According to a variant embodiment of the invention, the lower container comprises sharp and sealed walls.

This ensures that the lower container has a sufficient shelf life so that it is not necessary to replace it. According to this embodiment, the lower container requires a reduced maintenance level, since it is enough to empty it when the leachate it contains has reached a predetermined level, and clean it if desired.

Preferably, the upper container is placed on the lower container.

Thus, the dimensions of the means for holding the upper container arranged in the tank can be reduced, even without such support means.

Advantageously, the tank has at least one support wall of the upper container, this support wall protruding on an internal surface of a side wall of the tank.

Advantageously, the tank has a support flange of the upper container.

These simple means allow the upper container to be held in the tank.

The invention will be better understood after reading the following description provided by way of example only and made with reference to the drawings, in which:

- Figure 1 is a partial exploded perspective view of a waste storage system according to an embodiment of the invention,

- Figure 2 is a sectional view according to 11-11 of the storage system of Figure 1, and

- Figures 3 and 4 are views similar to that of Figure 2 according to embodiments of the invention.

In Fig. 1, a waste storage system 2 is illustrated according to an embodiment of the invention. This storage system 2 comprises a storage tank 4, an upper container 6 arranged in the tank 4 and intended to collect waste, and a lower liquid-tight container 8 disposed in the tank 4 and placed under the upper container 6. The deposit 4 delimits an internal volume with a generally rectangular parallelepiped shape whose longer sides are substantially parallel to the vertical direction. The tank 4 is intended to be at least partially buried in the ground and is made, for example, of concrete. The upper 6 and lower 8 containers are removable to facilitate the emptying operations of the containers 6, 8 and are made, for example, of a plastic material.

The storage system 2 is also provided with a pillar 10 comprising an access duct inside the tank 11. When a user wishes to deposit a residue in the storage system 2, he / she does so by means of the pillar 10. The latter allows to improve the ergonoirna of the storage system 2 since thanks to it, the user does not need to bend down to deposit a residue in the storage system 2.

Now the upper 6 and lower 8 containers will be described in more detail, as well as their arrangement in the tank 4.

With reference to Figure 2, the lower container 8 comprises a lid 12 having at least one hole 14,

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denominated inferior orifice, and that presents / displays a suitable form to direct Kquidos towards the inferior orifice 14 by gravity. In this way, it is suitable to guide the drops of liquid, specifically of leachate L, which flows from the upper container 6 through the bottom thereof into the lower container 8. In the present example, in a plane in section of Figure 2, which is vertical, the lid 12 of the lower container 8 has the same general section as a funnel. Furthermore, as can be seen in Figure 1, the lid 12 of the lower container 8 is formed by two flat walls 12a, 12b inclined towards the hole 14 of the lower container 8. However, it may be provided that the lid 12 of the lower container 8 Present any other form.

The upper container 6 is placed on the lower container 8. The upper container 6 comprises a bottom 15 having at least one hole 16, called the upper hole, and having a suitable way to direct the liquids to the upper hole 16 by gravity. In this way, the leachate L oozing out of the residues located in the upper container 6 is directed towards the upper hole 16 in order to facilitate its evacuation to the lower container 8. In order to improve this evacuation, the upper hole 16 it is placed in front of the lower hole 14 to allow the leachate L to flow directly from the upper container 6 to the lower container 8.

In order to reduce the emission of bad odors from the lower container 8, edges of the lower hole 14 are extended by retaining walls 18 that extend substantially vertically downward, that is to the interior of the lower container 8. The leached L stored in the lower container 8 emits malodorous vapors that ascend in the lower container 8. These vapors are partially trapped in zones 20 delimited by the retaining walls 18 and by the lid 12. These zones 20 are delimited by dashed lines represented in the figures .

When it is desired to empty the upper 6 and lower 8 containers, proceed as follows. The upper container 6 is removed from the tank 4 and its waste is emptied, for example in a dump truck. Subsequently, the lower container 8 is removed from the tank 4 and the leachate L which it contains is emptied, for example also in a dump truck. Optionally, these emptying operations can be used to clean the upper 6 and lower 8 containers. It is not necessary to clean the tank 4 since the lower container 8 prevents the leachate L from flowing to the bottom of the tank 4. Then, it can be replaced the lower container 8, then the upper container 6 in the tank 4.

In figure 3, a waste storage system 2 is shown according to a variant embodiment of the invention. This variant differs from the embodiment of Figures 1 and 2 because the lower container 8 is formed by a sealed membrane 22 disposed on a support with grid 24. In this way, the leachate L is maintained by the sealed membrane 22 until it is it is necessary to empty the lower container 8. When necessary, it is possible to close the membrane and remove it from the tank 4, without removing the support with grid 24. Then the closed and filled membrane can be replaced with a new membrane that is placed in the support with grid 24. This allows speeding up the emptying operations of the lower container 6 and not having to clean it.

Because the rack support 24 does not allow the upper container 6 to be effectively supported, the tank 4 also has at least one support wall 25 of the upper container 6, this support wall 25 being substantially horizontal and protruding on an internal surface of a lateral wall of the reservoir 4. This support wall 25 forms a mensula that extends throughout the contour of the lateral wall. The support wall 25 is fixedly removable, for example by screwing, on the side wall and is made, for example, of a metal. It may be provided that the support wall 25 does not extend along the entire contour of the side wall but is divided into four support walls each extending by one of the four faces of the side wall of the tank 4, each extending of the four supporting walls only for a part of the side width of the side wall of the tank 4 in which it is fixed, for example half of this length. In this way, the manufacturing cost of the support wall 25 is reduced. It can also be envisaged to replace this support wall with four support elements, for example metal posts of rectangular section, which extend substantially parallel to the vertical direction and fixed at the bottom of the tank 4 at the four corners of the tank 4. These support elements are intended to support the upper container 6.

The tank 4 also has a support flange 26 of the upper container 6. The support wall 25 and the support flange 26 have suitable ways to act in conjunction with the shape of the upper container 6 in order to keep it in place in the tank Four.

On the other hand, the storage system 2 of Figure 3 is devoid of a pillar. Instead, it is provided with an access cover to the reservoir 28, for example mounted in a rotational manner around a vertical or horizontal axis, or even mounted in a movable manner in horizontal translation. This cover 28 delimits an upper end of the storage system 2, and is placed for example at ground level or at a non-zero ground height to improve the ergonoirna of the storage system 2.

A storage system 2 according to another variant embodiment of the invention has been shown in Figure 4. This variant embodiment differs from the previous one because the lower container 8 comprises nigth and watertight walls 29. It is made, for example, of a stainless metal, possibly reinforced with reinforcements.

structural. These reinforcements allow the leachate L present in the lower container 8 to be pressurized, for example for cleaning purposes of the latter, without thereby damaging the walls 29 of the lower container 8. Thus it is guaranteed that the lower container 8 has a mechanical longevity sufficiently important so that it is not necessary to change it.

5 The storage system 2 also comprises connection means 30 to pumping means of the liquid present in the lower container 8. These connection means specifically comprise a conduit 32 that extends outside the reservoir 4 and flows outwards at ground level , outdoor. Eventually, it flows under a locked protection plate 34, of which only authorized operators have the means to unlock it. It may be provided that the conduit 32 extends largely inside the reservoir 4, even in a complete manner in the reservoir 4, or that the storage system 2 is provided with a pumping system such as that described in document FR -2 960 226. When it is desired to empty the lower container, an operator opens the protection plate 34 and connects the connection means 30 to a pump in the environment in which the conduit 32 flows to the outside. You can then pump the leachate L present in the lower container 8.

Naturally, numerous modifications may be made to the invention without departing from the scope of the appended claims.

The tank and the upper and lower containers may be made of materials other than those mentioned above. They may also present other forms than those described above and in the drawings.

The support wall may form a single piece with the side wall of the tank.

20 It may also be possible to combine the different modes of realization with each other.

Claims (9)

one. 10 2. 3. 15 4. 5. 20 6. 7. 25 8. 9. 30 10. eleven. 12. 35 13. Waste storage system (2) comprising: - a storage tank (4), and - an upper container (6) arranged in the tank (4) and intended to collect waste, characterized in that it comprises - a lower container (8) sealed to liquids arranged in the tank (4) and placed under the upper container (6), the lower container (8) comprising a lid (12) having at least one hole (14) and having a suitable way to direct liquids towards the hole (14) by gravity. Storage system (2) according to the preceding claim, wherein edges of the hole (14) of the lid (12) of the lower container (8) are extended by retaining walls (18) that extend substantially vertically downwards. Storage system (2) according to any one of the preceding claims, wherein the upper (6) and lower (8) containers are removable. Storage system (2) according to any one of the preceding claims, wherein the upper container (6) comprises a bottom (15) having at least one hole (16) and having a suitable way to direct the liquids towards the hole (16) by gravity. Storage system (2) according to the preceding claim, wherein the hole (16) of the upper container (6) is located in front of the hole (14) of the lower container (8). Storage system (2) according to any one of the preceding claims, wherein in a plane in vertical section, the lid (12) of the lower container (8) has the same general section as a funnel. Storage system (2) according to any one of the preceding claims, wherein the lid (12) of the lower container (8) is formed by two walls (12a, 12b) inclined towards the hole (14) of the lower container (8) ). Storage system (2) according to any one of the preceding claims, further comprising connection means (30) for pumping means of the liquid present in the lower container (8). Storage system (2) according to any one of claims 1 to 6, wherein the lower container (8) is formed by a sealed membrane (22) arranged in a rack support (24). Storage system (2) according to any one of claims 1 to 6, wherein the lower container (8) comprises nigid and watertight walls. Storage system (2) according to the preceding claim, wherein the upper container (6) is placed on the lower container (8). Storage system (2) according to any one of the preceding claims, wherein the tank (4) has at least one support wall (25) of the upper container (6), this support wall (25) protruding on a surface internal of a side wall of the tank (4). Storage system (2) according to any one of the preceding claims, wherein the tank (4) has a support flange (26) of the upper container (6).