Device for processing products resulting from the anaerobic digestion of organic waste by dry or semi-dry process

Abstract

TITLE. Device for treating products from the anaerobic digestion of organic waste by dry or semi-dry process. The invention relates to a device for treating (1) products from the anaerobic digestion of organic waste by dry or semi-dry process. This treatment device (1) comprises, on the one hand, means for introducing (4) a wet digestate, resulting from the digestion of organic waste and containing liquid, into the treatment device (1), on the other hand, means for extracting (5) at least a portion of the liquid contained in the wet digestate, in order to obtain a dry digestate, on the other hand, means for transferring (6) a digestion gas resulting from the digestion of organic waste, and on the other hand, means for removing the dry digestate from the treatment device (1).This device (1) is characterized in that it comprises a pump (8), while the means for introducing (4) the wet digestate, the means for extracting (5) the liquid, the means for transferring (6) the digestate gas, and the means for evacuating (7) the dry digestate comprise at least a portion of said pump (8). Figure for the abbreviation: Fig. 1.

Description

Title of the invention: Device for treating products from the anaerobic digestion of organic waste by dry or semi-dry process

[0001] The present invention relates to a device for treating products from the anaerobic digestion of organic waste by dry or semi-dry means.

[0002] This invention relates to the field of waste recovery and, more particularly, to the treatment of products from the anaerobic digestion, by dry or semi-dry method, of organic waste, in particular urban and / or agricultural.

[0003] Without being limited to it, the present invention will find a particularly suitable application when it comes to treating products from the digestion of waste containing a small amount of water such as biowaste, agricultural residues, manure, sludge, in particular from wastewater treatment plants.

[0004] Devices for treating products from the anaerobic digestion of organic waste by dry or semi-dry means are already known.

[0005] These treatment devices have a number of disadvantages, at least partly related to the composition of the products resulting from the anaerobic digestion of organic waste by dry or semi-dry means.

[0006] In this regard, it should be noted that such digestion of organic waste usually takes place within a digester (more particularly consisting of a methanizer) and produces, on the one hand, a wet digestate, which contains a liquid usually based on water, and which can be used as an organic fertilizer and, on the other hand, a digestion gas, which is a biogas, which contains methane, and which can be used as an energy source.

[0007] The wet digestate is a thick substance with specific physical and rheological properties that make its transfer difficult. Furthermore, this wet digestate contains sludge and various types of particles, such as stone, glass fragments, or metal fragments, some of which are quite large, further complicating its transfer. Consequently, transferring this wet digestate requires a specific transfer system (in particular, a transfer pump) with a particular design.

[0008] It will also be observed that the wet digestate contains a high proportion of dry matter but still contains too high a quantity of liquid, which increases the cost of agricultural waste recovery. This wet digestate must therefore be dehydrated, which is most often achieved by proceeding This involves phase separation between, on the one hand, a solid phase consisting of solid digestate and, on the other hand, a liquid phase consisting of liquid digestate. Such phase separation is usually achieved mechanically, either by centrifugation or by pressing, particularly using a variable-thread screw press, which compresses the wet digestate to obtain press water and a solid press cake. This phase separation requires the implementation of a specific phase separation system in addition to the aforementioned transfer system.

[0009] As mentioned above, the wet digestate can contain different types of particles whose dimensions can be considerable, which complicates the phase separation and requires the implementation of an even more complex and specific phase separation system which, again, is added to the aforementioned transfer system.

[0010] Regarding the digester gas, it is present in the digester at a low pressure (usually less than 1 bar) and contains carbon dioxide, which can be present in significant quantities (up to 40%). This reduces the combustion properties of the digester gas, necessitates suitable energy modules, and requires substantial storage capacity. One solution is to compress this digester gas to facilitate its purification stages downstream of the digester. Various technologies can be used to compress this digester gas, such as screw compressors, liquid ring compressors, and rotary vane compressors. These compressors constitute, once again, a specific and additional compression system that complements the transfer and phase separation systems mentioned above.

[0011] It will be observed that the device for treating products resulting from the anaerobic digestion of organic waste by dry or semi-dry process comprises a plurality of systems (transfer, phase separation, and compression) which each perform a specific step (transfer, phase separation, and compression) in the treatment of these products, individually. This treatment device is thus configured so that these systems perform the steps of this treatment successively. The succession of steps in this treatment results in a particularly long treatment time.

[0012] Furthermore, the multiplicity of these systems (transfer, phase separation, and compression) generates high investment and operating costs and requires a significant land footprint. These drawbacks hinder the widespread adoption of digesters, particularly dry or semi-dry biogas plants, especially those with continuous operation.

[0013] The present invention is intended to remedy, at least in part, the drawbacks of devices for treating products from the anaerobic digestion of organic waste by dry or semi-dry means in the prior art.

[0014] To this end, the invention relates to a device for treating products from the anaerobic digestion of organic waste by dry or semi-dry process. This treatment device comprises, on the one hand, means for introducing a wet digestate, resulting from the digestion of organic waste and containing liquid, into the treatment device; on the other hand, means for extracting at least a portion of the liquid contained in the wet digestate, in order to obtain a dry digestate; on the other hand, means for transferring a digestion gas (methane) resulting from the digestion of organic waste; and on the other hand, means for removing the dry digestate from the treatment device. The device is characterized in that it comprises a pump, while the means for introducing the wet digestate and the means for extracting the liquid,The means for transferring the digestate gas and the means for evacuating the dry digestate include at least a portion of said pump.

[0015] Another characteristic relates to the fact that the pump comprises, on the one hand, a first chamber which is configured to contain the wet digestate, on the other hand, a second chamber which is configured to contain the digestion gas and, on the other hand, a piston, which is interposed between the first chamber and the second chamber, which delimits the first chamber and the second chamber, which is movable inside the pump and, on the other hand also, means for actuating the piston.

[0016] According to another feature, the wet digestate introduction means include suction means, which are configured to suction the wet digestate into the treatment device, and which include the piston as well as the piston actuating means.

[0017] Yet another feature relates to the fact that the liquid extraction means include crushing means, which are configured to crush the wet digestate, and which include the piston as well as the piston actuating means.

[0018] An additional feature relates to the fact that the means for transferring the digestion gas include compression means, which are configured to compress this digestion gas inside the treatment device, and which include the piston as well as the piston actuating means.

[0019] The invention also relates to an organic waste recovery installation; this recovery installation comprises, on the one hand, a digestion device configured to ensure anaerobic digestion of organic waste by dry or semi-dry process and, on the other hand, a treatment device, which is configured to process products from the anaerobic digestion of organic waste by dry or semi-dry means, and which is fed with such products by the digestion device. In this recovery system, the treatment device has the characteristics described above.

[0020] Thus, the invention relates to a device for treating products from the anaerobic digestion of organic waste by dry or semi-dry process. This treatment device comprises a pump as well as means for introducing the wet digestate, means for extracting the liquid, means for transferring the digestion gas and means for evacuating the dry digestate, these means comprising at least a portion of said pump.

[0021] Such characteristics advantageously allow the different means (of introducing wet digestate, extracting liquid, transferring digestion gas and removing dry digestate) to be grouped together within the same treatment device and the function of these different means (introducing wet digestate, extracting liquid, transferring digestion gas and removing dry digestate) to be performed by a single pump.

[0022] Moreover, such characteristics advantageously allow for a considerable reduction in the investment and operating costs of processing products from the anaerobic digestion of organic waste by dry or semi-dry methods. Furthermore, having a single pump within the treatment device perform the function of these various means advantageously allows for a particularly compact treatment system that reduces its footprint.

[0023] Other objects and advantages of the present invention will become apparent during the following description relating to embodiments which are given only by way of indicative and non-limiting examples.

[0024] Understanding this description will be facilitated by referring to the drawings attached in the appendix, in which:

[0025] [Fig. 1] represents a schematic and cross-sectional view of a first embodiment of a processing device according to the invention.

[0026] [Fig.2] represents a schematic and cross-sectional view of a second mode of implementation of a treatment device conforming to the invention.

[0027] With reference to the figures in the attached drawings, the present invention relates to the field of waste recovery and, more particularly, to the treatment of products from the anaerobic digestion, by dry or semi-dry process, of organic waste, in particular urban and / or agricultural.

[0028] The invention relates, then, more particularly, to a device for treating 1 products from the anaerobic digestion of organic waste by dry or semi-dry method.

[0029] In this regard, it will be noted that the anaerobic digestion of organic waste by dry or semi-dry means leads to the production, on the one hand, of a first product consisting of a wet digestate, which contains a liquid (usually water-based), and which can be used as an organic fertilizer and, on the other hand, of a second product consisting of a digestion gas, which is a biogas, which contains methane and carbon dioxide, and which can be used as an energy source.

[0030] The processing device 1 comprises, on the one hand, an input 2 and, on the other hand, an output 3.

[0031] The treatment device 1 includes introduction means 4 which are configured to introduce, inside the treatment device 1 (and more particularly through the inlet 2 of this treatment device 1), the wet digestate which results from the digestion (more particularly anaerobic and by dry or semi-dry means) of organic waste.

[0032] This treatment device 1 further includes extraction means 5 which are configured to extract at least part of the liquid contained in the wet digestate, in order to obtain a dry digestate.

[0033] This treatment device 1 also includes transfer means 6 which are configured to transfer the digestion gas resulting from the digestion (more particularly anaerobic and by dry or semi-dry means) of organic waste.

[0034] This treatment device 1 also includes evacuation means 7 which are configured to evacuate, out of the treatment device 1 (and more particularly through the outlet 3 of this treatment device 1), the dry digestate, more particularly which is obtained from the wet digestate and by extraction of the liquid out of this wet digestate by means of the extraction means 5.

[0035] According to the invention, this treatment device 1 comprises a pump 8 while the means for introducing 4 the wet digestate, the means for extracting 5 the liquid, the means for transferring 6 the digestion gas and the means for evacuating 7 the dry digestate comprise at least a part of said pump 8.

[0036] As shown in the figures in the appendix, this pump 8 comprises, on the one hand, a first chamber 80 which is configured to contain digestate (more particularly wet digestate as well as dry digestate), on the other hand, a second chamber 81 which is configured to contain the digestion gas and, on the other hand, a piston 82, which is interposed between the first chamber 80 and the second chamber 81, which delimits the first chamber 80 and the second chamber 81, which is mobile inside the pump 8 and, on the other hand also, means of actuation 83 of the piston 82.

[0037] These actuation means 83 comprise a cylinder which includes, on the one hand, a cylinder body (not illustrated) and, on the other hand, a cylinder rod 84, which is movable relative to the cylinder body, and which is fixedly and movingly attached to the piston 82.

[0038] As can be seen in the figures in the appendix, this treatment device 1 comprises, on the one hand, a first hollow body 9 (more particularly tubular), which extends in a first direction, which is configured to contain digestate (more particularly wet digestate and dry digestate), and which includes at least a part of the first chamber 80 and, on the other hand, a second hollow body 10 (more particularly tubular), which extends in a second direction which forms a non-zero angle (preferably a right angle) with the first direction, which includes another part of the first chamber 80 as well as the second chamber 81, and inside which the movable piston 82 is positioned.

[0039] This first hollow body 9 and / or this second hollow body 10 and / or this piston 82 can be made of steel, in particular stainless steel, more particularly stainless steel 3161.

[0040] As mentioned above, the treatment device 1 includes means for introducing the wet digestate 4 into this treatment device 1.

[0041] Such introduction means 4 then comprise suction means which are configured to suction the wet digestate into the treatment device 1, more particularly into the first hollow body 9 and / or into the first chamber 80 of the pump 8.

[0042] Such suction means comprise the piston 82 as well as the actuation means 83 of this piston 82.

[0043] As mentioned above, the treatment device 1 includes means for extracting 5 at least some of the liquid contained in the wet digestate.

[0044] Such extraction means 5 include crushing means, which are configured to crush the wet digestate, more particularly inside the first hollow body 9 and / or inside the first chamber 80 of the pump 8.

[0045] Such crushing means comprise the piston 82 as well as the actuation means 83 of this piston 82.

[0046] According to another feature, the treatment device 1 (more particularly the extraction means 5 which the treatment device 1 comprises) includes means for sieving 50 of the wet digestate.

[0047] Such sieving means 50 take the form of a grid or sieve, more particularly made of stainless steel. Such sieving means 50 may be removable to facilitate their maintenance.

[0048] Such sieving means 50 are positioned opposite and downstream (more particularly vertically) of the crushing means.

[0049] In fact, it is, more particularly, the first hollow body 9 (in particular a bottom which this first hollow body 1 comprises) which comprises such sieving means 50.

[0050] Such screening means 50 are configured, on the one hand, to allow the liquid contained in the wet digestate to pass through these screening means 50 and so that this liquid can exit the first hollow body 9 (and, more generally, the treatment device 1) and, on the other hand, to prevent the passage of particles (in particular stones, fragments of glass or metal) through these screening means 50 and thus to ensure that these particles are kept inside the first hollow body 9 (and, more generally, the treatment device 1).

[0051] According to another feature, the treatment device 1 (more particularly the extraction means 5 which the treatment device 1 comprises) also comprises, on the one hand, means for collecting 51 the liquid extracted by means of the extraction means 5 and, on the other hand, means for evacuating 52 at least part of the extracted liquid, this outside the treatment device 1, in particular outside the collection means 51.

[0052] In this regard, it should be noted that these collection means 51, and even the discharge means 52, are positioned opposite and downstream (more specifically vertically) of the screening means 50, and even of the crushing means. Furthermore, such collection means 51, and even such discharge means 52, are positioned outside the first hollow body 9.

[0053] It will be noted that the said evacuation means 52 may include (or even be constituted by) at least one valve.

[0054] Yet another feature concerns the fact that the treatment device 1 (more particularly the extraction means 5 that the treatment device 1 comprises) includes discharge means configured to discharge at least a portion of the extracted liquid (contained in the collection means 51) into the treatment device 1 (more particularly into the first hollow body 9 and / or the first chamber 80 of the pump 8) and through the screening means 50. Advantageously, such discharge means allow the screening means 50 to be unclogged. These discharge means again include the piston 82 and the actuating means 83 for this piston 82.

[0055] In addition, such means of repulsion may also include the evacuation means 52 mentioned above.

[0056] As mentioned above, the treatment device 1 includes means for transferring the digestion gas 6.

[0057] Such transfer means 6 include compression means, which are configured to compress this digestion gas inside the treatment device 1, more particularly inside the second chamber 81 of the pump 8.

[0058] Such compression means comprise the piston 82 as well as the actuation means 83 of this piston 82.

[0059] According to another feature, these means for transferring the digestion gas 6 further comprise, on the one hand, introduction means 60 which are configured to allow the introduction of the digestion gas into the treatment device 1 (more particularly into the second chamber 81 of the pump 8), and, on the other hand, exhaust means 61 which are configured to allow the exhaust of the compressed digestion gas outside the treatment device 1 (more particularly outside the second chamber 81 of the pump 8).

[0060] Such exhaust means 61 are, more particularly, connected to means for storing and / or purifying (not shown) this digestion gas.

[0061] As mentioned above, the treatment device 1 includes means for evacuating the dry digestate 7.

[0062] Such means of evacuation 7 of the dry digestate include repulsion means which are configured to repel the dry digestate out of the treatment device 1, more particularly out of the first hollow body 9 and / or the first chamber 80 of the pump 8, in particular in the direction of the outlet 3 of this treatment device 1.

[0063] Such repulsion means comprise the piston 82 as well as the actuation means 83 of this piston 82.

[0064] In this regard, it should be noted that, inside the first chamber 80 of the pump 8, this piston 82 has a bevel 85 or is equipped with an element which has a bevel 85. Such a bevel 85 has a surface which is oriented towards the outlet 3 of the processing device 1.

[0065] In addition, this surface forms a non-zero angle (preferably between 20° and 45°) with the first direction in which the first hollow body 9 extends and / or a non-zero angle (preferably between 45° and 65°) with the direction of movement of the piston 82.

[0066] According to another feature, the treatment device 1 includes upstream closing means 11 which are configured to close the treatment device 1 (more particularly the first hollow body 9 and / or the first chamber 80 of the pump 8) upstream (more particularly at the inlet 2).

[0067] According to yet another feature, the processing device 1 includes downstream closing means 12 which are configured to close the processing device 1 (more particularly the first hollow body 9 and / or the first chamber 80 of the pump 8) downstream (more particularly at the outlet 3).

[0068] Such upstream closing means 11 and / or such downstream closing means 12 may adopt the form of a guillotine door or the like.

[0069] In this regard, it should be noted that the terms "upstream" and "downstream" refer to the direction of flow of the digestate within the treatment device 1.

[0070] Yet another illustrated feature [Fig.2] relates to the fact that the treatment device 1 may also include additional transfer means 13, which are configured to transfer a digestion gas resulting from the digestion of organic waste, which the pump 8 includes, and which includes, on the one hand, at least a first additional chamber 130 which is configured to contain digestion gas, on the other hand, an additional piston 131, which delimits at least the first additional chamber 130, and which is movable inside the pump 8 and, on the other hand, additional actuation means 132 for the additional piston 131.

[0071] In this regard, it will be recalled that the pump 8, which has been described above, includes actuation means 83 which include a cylinder which includes, on the one hand, a cylinder body and, on the other hand, a cylinder rod 84, which is movable relative to the cylinder body, and which is fixedly and movingly attached to the piston 82.

[0072] Also, and with regard to the additional actuation means 132, these are preferably constituted by the actuation means 83 which the pump 8 comprises.

[0073] In such a case, the cylinder rod 84, which these actuation means 83 of the pump 8 comprise, is, then also, fixedly and movingly attached to the additional piston 131 of the additional transfer means 13.

[0074] It will be observed that, under the impulse of the actuation means 83 and the additional actuation means 132, the pump 8 allows, on the one hand and when the piston 82 and the additional piston 131 descend, the entry of digestion gas into the second chamber 81 of the pump 8 as well as the compression of digestion gas inside the first additional chamber 130, this simultaneously and, on the other hand and when the piston 82 and the additional piston 131 ascend, the compression of digestion gas inside the second chamber 81 of the pump 8 as well as the entry of digestion gas into the first additional chamber 130, this simultaneously.

[0075] Additionally, these additional transfer means 13 may further comprise a second additional chamber 133 which is configured to contain digestion gas. In such a case, the additional piston 131 is interposed between the first additional chamber 130 and the second chamber additional 133, and, on the other hand, delimits the first additional chamber 130 and the second additional chamber 133.

[0076] It will be observed, then, that, under the impulse of the actuation means 83 and the additional actuation means 132, the pump 8 allows, on the one hand and when the piston 82 and the additional piston 131 descend, the entry of digestion gas into the second chamber 81 of the pump 8, the compression of digestion gas inside the first additional chamber 130 as well as the entry of digestion gas into the second additional chamber 133, this simultaneously and, on the other hand and when the piston 82 and the additional piston 131 ascend, the compression of the digestion gas inside the second chamber 81 of the pump 8, the entry of digestion gas into the first additional chamber 130, and the compression of the digestion gas inside the second additional chamber 133, this simultaneously.

[0077] According to another feature, these additional means for transferring the digestion gas 13 further comprise, on the one hand, additional introduction means (134; 134') which are configured to allow the introduction of the digestion gas into the treatment device 1 (more particularly into the first additional chamber 130, respectively into the second additional chamber 133), and, on the other hand, additional exhaust means (135; 135') which are configured to allow the compressed digestion gas to escape from the treatment device 1 (more particularly from the first additional chamber 130, respectively from the second additional chamber 133).

[0078] Such additional means of exhaust (135; 135') are, more particularly, connected to means of storage and / or means of purification (not shown) of this digestion gas.

[0079] As mentioned above, the additional transfer means 13 are configured to transfer a digestion gas that results from the digestion of organic waste.

[0080] However, and according to another feature of the invention, these additional means for transferring the digestion gas 13 also include compression means, which are configured to compress this digestion gas inside the treatment device 1 (more particularly inside the first additional chamber 130, or even inside the second additional chamber 133), and which include the additional piston 131 as well as the additional actuation means 132 for this additional piston 131.

[0081] The present invention also relates to an installation for the recovery of organic waste.

[0082] This recovery facility includes, on the one hand, a digestion device (not illustrated), which is configured to ensure anaerobic digestion of organic waste by dry or semi-dry means, and which is usually known as a methanization plant.

[0083] On the other hand, this recovery facility includes a treatment device 1, which is configured to treat products from the anaerobic digestion of organic waste by dry or semi-dry means, and which is fed by such products, this by the digestion device.

[0084] According to the invention, in this recovery facility, the treatment device 1 has the characteristics described above.

[0085] According to another feature, the digestion device comprises, on the one hand, a chamber which is configured to contain organic waste to be digested and, on the other hand, evacuation means which are configured to evacuate, out of the chamber, a wet digestate which results from the digestion (more particularly anaerobic by dry or semi-dry means) of the organic waste.

[0086] These evacuation means, which this digestion device includes, are connected to the means for introducing 4 of the wet digestate into the treatment device 1, which this treatment device 1 includes, and which are described above.

[0087] Yet another characteristic relates to the fact that the digestion device includes means of escape, which are configured to release, outside the enclosure, a digestion gas (in particular which contains methane and carbon dioxide) resulting from the digestion (more particularly anaerobic by dry or semi-dry means) of organic waste.

[0088] These exhaust means, which the digestion device includes, are connected to the means for transferring the digestion gas 6, which the treatment device 1 includes, and which are described above.

[0089] The present invention also relates to a process for treating products resulting from the anaerobic digestion of organic waste by dry or semi-dry means. This treatment process is, more particularly, implemented by means of the treatment device 1 described above.

[0090] This treatment process includes an introduction step which consists of introducing a wet digestate (which results from the anaerobic digestion of organic waste by dry or semi-dry means) into a treatment device 1 of the products from the anaerobic digestion of organic waste by dry or semi-dry means (more particularly into a treatment device 1 as described above, in particular into the first chamber 80 of the pump 8 and / or into the first hollow body 9 of this treatment device 1), more particularly from the digestion device mentioned above.

[0091] This introduction step is, at least in part, implemented by the introduction means 4 described above and consists of opening the upstream closing means 11, closing the evacuation means 52 of the extraction means 5 as well as the downstream closing means 12, and actuating the actuation means 83 of the pump 8. Under the effect of the actuation of these actuation means 83, the cylinder rod 84 and the piston 82 of the pump 8 rise, which creates a suction of the wet digestate inside the treatment device 1.

[0092] This treatment process also includes an extraction step which consists of extracting at least part of the liquid contained in the wet digestate, in order to obtain a dry digestate.

[0093] This extraction step is, at least in part, implemented by means of the extraction means 5 described above and consists of closing the upstream closing means 11 (or even the downstream closing means 12), opening the discharge means 52 of the extraction means 5 and actuating the actuation means 83 of the pump 8. Under the effect of the actuation of these actuation means 83, the cylinder rod 84 and the piston 82 of the pump 8 descend which causes the wet digestate to be crushed inside the treatment device 1 and the liquid to flow through the screening means 50 and into the collection means 51.

[0094] This extraction step is implemented after the introduction step.

[0095] This treatment process also includes an evacuation step which consists of evacuating the dry digestate out of the treatment device 1 (more particularly out of the first chamber 80 of the pump 8 and / or out of the first hollow body 9), more particularly towards a means of storing this dry digestate.

[0096] This evacuation step is, at least in part, implemented by the evacuation means 7 and consists of closing the evacuation means 52 of the extraction means 5, opening the downstream closing means 12, and actuating the actuation means 83 of the pump 8. Under the effect of the actuation of these actuation means 83, the cylinder rod 84 and the piston 82 of the pump 8 descend, which causes a repulsion of the dry digestate outside the treatment device 1, this under the effect of the bevel 85.

[0097] It will be noted that this evacuation step is implemented after the extraction step, in particular as an extension of this extraction step.

[0098] The treatment process may also include a pumping step which consists of pumping at least part of the liquid extracted from the wet digestate back into the treatment device 1.

[0099] This discharge step consists of closing the downstream closing means 12, opening the discharge means 52 of the extraction means 5, and actuating the Pump 8 actuation means 83. Under the effect of the actuation of these actuation means 83, the cylinder rod 84 and the piston 82 of the pump 8 rise, which causes a vacuum enabling the discharge of at least part of the extracted liquid (which is contained in the collection means 51), this into the treatment device 1 (more particularly into the first hollow body 9 and / or the first chamber 80 of the pump 8) as well as through the screening means 50. Such discharge advantageously allows the screening means 50 to be unclogged.

[0100] Finally, this treatment process also includes a transfer step which consists of transferring digestion gas resulting from the digestion of organic waste, more particularly from the digestion device and towards a means of storage or purification of this digestion gas.

[0101] This transfer step is, at least in part, implemented by the transfer means 6 (or even by the additional transfer means 13) described above.

[0102] This transfer step consists, firstly, of opening the inlet means 60 (or even the additional inlet means 134, 134') and closing the outlet means 61 (or even the additional outlet means 135, 135'), subsequently, of actuating the actuation means 83 of the pump 8 (or even the additional actuation means 132), in order to allow the penetration of the digestion gas into the second chamber 81 of the pump 8 (or even into the first additional chamber 130, or even into the second additional chamber 133) and, finally, of closing the inlet means 60 (or even the additional inlet means 134, 134') and opening the outlet means 61 (or even the additional outlet means 135, 135'),This is to allow the digestion gas to escape from the second chamber 81 of the pump 8 (or even from the first additional chamber 130, or even from the second additional chamber 133).

[0103] It will be observed that this transfer step includes a compression step which consists of compressing the digestion gas, more particularly the digestion gas contained inside the second chamber 81 of the pump 8 (or even inside the first additional chamber 130, or even inside the second additional chamber 133).

[0104] In this regard, it will be noted that this compression step is implemented by means of the actuation means 83 (or even by means of the additional actuation means 132).

[0105] Thus, under the effect of the actuation of these actuation means 83 (or even additional actuation means 132), the cylinder rod 84 and the piston 82 from pump 8 (or even the additional piston 131) rise which creates a compression of the digestion gas inside the second chamber 81 of pump 8 (or even inside the second additional chamber 133).

[0106] Where appropriate, under the effect of the actuation of the additional actuation means 132, the cylinder rod 84 and the additional piston 131 descend, which creates a compression of the digestion gas inside the first additional chamber 130.

[0107] Also, and according to another feature of the process according to the invention, the compression step is carried out at the same time as at least the introduction step, or even at the same time as the discharge step.

[0108] In addition (and, more particularly when the treatment device 1 includes additional transfer means 13), the compression step is also carried out at the same time as at least the extraction step and / or at least the evacuation step.

Claims

Demands

1. A treatment device (1) for products resulting from the anaerobic digestion of organic waste by dry or semi-dry process, this treatment device (1) comprises, on the one hand, means for introducing (4) a wet digestate into the treatment device (1), which results from the digestion of organic waste and contains liquid, on the other hand, means for extracting (5) at least a portion of the liquid contained in the wet digestate, in order to obtain a dry digestate, on the other hand, means for transferring (6) a digestion gas resulting from the digestion of organic waste, and on the other hand, means for removing (7) the dry digestate from the treatment device (1), characterized in that it comprises a pump (8) while the means for introducing (4) the wet digestate and the means for extracting (5) the liquid,The means (6) for transferring the digestate gas and the means (7) for evacuating the dry digestate comprise at least a portion of said pump (8).

2. Processing device (1) according to claim 1, characterized in that the pump (8) comprises, on the one hand, a first chamber (80) which is configured to contain digestate, on the other hand, a second chamber (81) which is configured to contain the digestion gas and, on the other hand, a piston (82), which is interposed between the first chamber (80) and the second chamber (81), which delimits the first chamber (80) and the second chamber (81), which is movable inside the pump (8) and, on the other hand also, means for actuation (83) of the piston (82).

3. Processing device (1) according to claim 2 characterized in that the actuation means (83) comprise a cylinder which includes, on the one hand, a cylinder body and, on the other hand, a cylinder rod (84), which is movable relative to the cylinder body, and which is fixedly and movingly attached to the piston (82).

4. A treatment device (1) according to claim 2, characterized in that the treatment device (1) comprises, on the one hand, a first hollow body (9), extending in a first direction, configured to contain digestate, and comprising at least a portion of the first chamber (80), and, on the other hand, a second hollow body (10), extending in a second direction, which forms a non-zero angle with the first direction, which includes another part of the first chamber (80) as well as the second chamber (81), and inside which the movable piston (82) is positioned.

5. Processing device (1) according to claims 1 and 2, characterized in that the means for introducing the wet digestate (4) comprise suction means, which are configured to suction the wet digestate into the processing device (1), and which comprise the piston (82) as well as the means for actuation (83) of this piston (82).

6. Processing device (1) according to claims 1 and 2, characterized in that the liquid extraction means (5) comprise crushing means, which are configured to crush the wet digestate, and which comprise the piston (82) as well as the actuation means (83) of this piston (82).

7. Processing device (1) according to any one of the preceding claims, characterized in that the liquid extraction means (5) comprise wet digestate screening means (50).

8. Processing device (1) according to claim 7, characterized in that the processing device (1) comprises pumping means which are configured to pump at least a portion of the extracted liquid, this into the processing device (1) as well as through the screening means (50).

9. Processing device (1) according to claims 1 and 2, characterized in that the means for transferring the digestion gas (6) comprise compression means, which are configured to compress this digestion gas inside the processing device (1), and which comprise the piston (82) as well as the means for actuating this piston (82).

10. Treatment device (1) according to claims 1 and 2, characterized in that the means for evacuating the dry digestate (7) comprise repulsion means, which are configured to repel the dry digestate out of the treatment device (1), and which comprise the piston (82) as well as the means for actuating this piston (82).

11. Processing device (1) according to claim 10, characterized in that, inside the first chamber (80) of the pump (8), the piston (82) has a bevel (85) or is equipped with an element that presents a bevel (85), such a bevel (85) has a surface which is oriented towards an outlet (3) which comprises the processing device (1).

12. Processing device (1) according to any one of the preceding claims, characterized in that it comprises, on the one hand, upstream closing means (11) which are configured to close the processing device (1) upstream and, on the other hand, downstream closing means (12) which are configured to close the processing device (1) downstream.

13. Processing device (1) according to any one of the preceding claims, characterized in that it comprises additional transfer means (13), which are configured to transfer a digestion gas resulting from the digestion of organic waste, which the pump (8) comprises, and which comprise, on the one hand, at least one first additional chamber (130) which is configured to contain digestion gas, on the other hand, an additional piston (131), which delimits at least the first additional chamber (130), and which is movable inside the pump (8) and, on the other hand, additional means for actuating (132) the additional piston (131).

14. Processing device (1) according to claims 3 and 13, characterized in that, on the one hand, the additional actuation means (132) are constituted by the actuation means (83) that the pump (8) comprises and, on the other hand, the cylinder rod (84), which the actuation means (83) of the pump (8) comprises, is also fixedly and movingly attached to the additional piston (131).

15. Processing device (1) according to any one of claims 13 or 14, characterized in that the additional means for transferring the digested gas (13) comprise compression means, which are configured to compress this digested gas inside the processing device (1), and which comprise the additional piston (131) as well as the additional means for actuating this additional piston (131).

16. Organic waste recovery facility, this recovery facility comprises, on the one hand, a digestion unit which is configured to ensure anaerobic digestion of organic waste by dry or semi-dry process and, on the other hand, a device of treatment (1), which is configured to treat products from the anaerobic digestion of organic waste by dry or semi-dry means, and which is fed with such products by the digestion device, characterized in that the treatment device (1) conforms to any one of the preceding claims.

17. An organic waste recovery installation according to claim 16, characterized in that the digestion device comprises, on the one hand, a chamber which is configured to contain organic waste to be digested and, on the other hand, evacuation means which are configured to evacuate, out of the chamber, a wet digestate which results from the digestion of the organic waste, while the evacuation means, which the digestion device comprises, are connected to the means for introducing (4) the wet digestate into the treatment device (1) and that this treatment device (1).

18. An organic waste recovery installation according to claim 16, characterized in that the digestion device comprises, on the one hand, a chamber which is configured to contain organic waste to be digested and, on the other hand, exhaust means, which are configured to release, outside the chamber, a digestion gas resulting from the digestion of the organic waste, while these exhaust means, which the digestion device comprises, are connected to the means for transferring (6) the digestion gas which the treatment device (1) comprises.

19. A process for treating products from the anaerobic digestion of organic waste by dry or semi-dry means, this treatment process comprises: - an introduction step consisting of introducing, into a treatment device (1) for products from the anaerobic digestion of organic waste by dry or semi-dry means, a wet digestate, which results from the digestion of organic waste and contains liquid; - an extraction step consisting of extracting at least a portion of the liquid contained in the wet digestate, in order to obtain a dry digestate; - a removal step consisting of removing the dry digestate from the treatment device (1); - characterized in that it comprises:

20. - a transfer stage, which consists of transferring a digestion gas resulting from the digestion of organic waste, and which includes a compression stage which consists of compressing this digestion gas; - and that the compression step is carried out at the same time as at least the introduction step, or even at the same time as a pumping step which consists of pumping at least part of the liquid extracted from the wet digestate, this inside the treatment device (1). Process for treating products from the anaerobic digestion of organic waste by dry or semi-dry means according to claim 19, characterized in that the compression step is also carried out at the same time as at least the extraction step and / or at least the evacuation step.

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