A biogas slurry recycling system and self-cleaning biogas slurry filter

Abstract

The present invention relates to the field of biogas slurry treatment technology, and discloses a biogas slurry recycling system and a self-cleaning biogas slurry filter thereof. The self-cleaning biogas slurry filter comprises a filter cartridge and a partition; the partition divides the space in the filter cartridge into a plurality of channels; the self-cleaning biogas slurry filter body is rotatably arranged at the connection point of the plurality of channels. In the above technical solution, the biogas is filtered by the lower part of the self-cleaning filter module in the liquid inlet channel, and then flows back. The biogas is further filtered for a second time by the upper part of the self-cleaning filter module and then enters the liquid outlet channel. In this way, multi-stage filtration of the biogas slurry is formed, and the filtration is more thorough and the effect is better. In the above filtering operation, after a certain amount of biogas residue adheres to a part of the self-cleaning biogas slurry filter body toward the liquid inlet channel, the self-cleaning biogas slurry filter body rotates, and the part rotates to the liquid outlet channel, where the biogas residue is washed away by the biogas flow out to complete self-cleaning. With this technical solution, the equipment maintenance cycle is greatly extended, and the equipment maintenance cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of biogas slurry treatment, and in particular to a biogas slurry recycling system and a self-cleaning biogas slurry filter thereof. Background Art

[0002] Biogas slurry is a bright brown liquid formed by the fermentation of organic matter. It contains amino acids, cellulose, cellulase, protein, ribose, auxins, gibberellins, unsaturated fatty acids, and certain antibiotics. Due to its high fertilizer efficiency and ease of absorption due to its water quality, biogas slurry is widely used for irrigation and fertilization of crops.

[0003] Biogas slurry contains a high concentration of biogas residue, requiring solid-liquid separation for easier transportation, storage, and use. If biogas slurry is not treated for impurities when used in irrigation systems, it can easily clog pipes and sprinkler units. Furthermore, the suspended matter in highly concentrated biogas slurry contains a large number of microorganisms, which are highly adherent and particularly susceptible to porous materials, forming flocs that can clog mesh.

[0004] The above analysis is about the use of biogas slurry and the influence of biogas residue. In the prior art, when biogas slurry is being processed, especially in the process of making fertilizer, when the biogas slurry is being filtered, the biogas residue is very likely to adhere to the surface of the filter element. Therefore, it is necessary to clean the filter element regularly to remove the adhered biogas residue to prevent the biogas residue from clogging the filter element. Or the biogas slurry can be pretreated. In the above-mentioned prior art, the cost of biogas residue filtration treatment is relatively high, and the cost includes time cost, labor cost and material cost. Therefore, there is a need for a biogas slurry filter that can clean the filter element by itself to extend the maintenance cycle and reduce the cost of use. Summary of the Invention

[0005] The present application provides a biogas slurry recycling system and a self-cleaning biogas slurry filter thereof to solve the above-mentioned technical problem of high biogas residue filtering treatment cost in the prior art.

[0006] According to one aspect of the present application, an embodiment provides a self-cleaning biogas slurry filter, comprising:

[0007] A filter cartridge for biogas slurry to flow through; the filter cartridge has a feed port and a sealing head;

[0008] A partition fixedly disposed in the filter cartridge; the partition divides the space in the filter cartridge into a plurality of channels; the plurality of channels are connected at the end of the filter cartridge; and

[0009] A self-cleaning biogas slurry filter body is fixed in the filter cartridge; the self-cleaning biogas slurry filter body is rotatably arranged at the connection point of the multiple channels;

[0010] The self-cleaning biogas slurry filter body is configured as a self-cleaning filter screen module, which is used to change the position of a portion facing the liquid inlet channel to the liquid outlet channel during rotation to flush the biogas residue adhered to the surface.

[0011] In one embodiment, the partition divides the space in the filter cartridge into two channels.

[0012] In one embodiment, the first end of the partition is close to the feed port of the filter cartridge and is welded and fixed to the inner wall of the filter cartridge, and the feed port is connected to the liquid inlet channel; the middle position of the second end of the partition is fixedly connected to a rotating support for fixing the self-cleaning biogas slurry filter body.

[0013] In one embodiment, the self-cleaning filter module includes multiple overlapping filter module units; a drive rod is passed through the center of the filter module unit; the first end of the drive rod is inserted into the rotating support to form a rotating fit; a locking nut is threadedly connected to the drive rod for fixing the multiple filter module units.

[0014] In one embodiment, the second end of the driving rod is connected to a driving mechanism.

[0015] In one embodiment, the driving mechanism is disposed outside the filter cartridge.

[0016] In one embodiment, the driving mechanism includes a passive worm gear connected to the second end of the driving rod, the passive worm gear is connected to the active worm, and the active worm is connected to the motor.

[0017] In one embodiment, the self-cleaning filter screen module is further provided with filter residue buffer chambers on the front filter side and the rear filter side, and the filter residue buffer chambers are both connected to the first channel.

[0018] According to another aspect of the present application, an embodiment provides a biogas slurry recycling system, comprising a self-cleaning biogas slurry filter as described above; the discharge port of the self-cleaning biogas slurry filter is connected to an MBR processor and a nanofiltration device in sequence.

[0019] In one embodiment, the nanofiltration device includes a nanofiltration shell; a plurality of nanofiltration module columns for filtration are fixed in the nanofiltration shell.

[0020] In the above-mentioned embodiment of the biogas slurry recycling system and its self-cleaning biogas slurry filter, biogas slurry enters the self-cleaning biogas slurry filter from the feed port and is filtered through the filter screen. Specifically, after the biogas slurry is filtered by the lower part of the self-cleaning filter screen module in the liquid inlet channel, it flows back. The biogas slurry is further filtered by the upper part of the self-cleaning filter screen module for a second time and then enters the liquid outlet channel and is discharged through the discharge port. In this way, multi-stage filtration of the biogas slurry is formed, the filtration is more thorough, and the effect is better. In the above-mentioned filtering operation, after a certain degree of biogas residue adheres to a part of the self-cleaning biogas slurry filter body (such as the lower part) toward the liquid inlet channel, the self-cleaning biogas slurry filter body rotates, and the self-cleaning biogas slurry filter body rotates toward the part of the liquid inlet channel to the liquid outlet channel. When the biogas in the liquid outlet channel flows out, the biogas residue is washed away to complete self-cleaning, which can prevent more biogas residue from continuing to adhere and accumulate to form a biogas residue layer and block the self-cleaning filter screen module. This technical solution plays a self-cleaning role by rotating the self-cleaning filter screen module to transform the contaminated part into the liquid outlet channel and to have the filter residue washed away by the outlet liquid. The self-cleaning biogas slurry filter and the biogas slurry recycling system using the self-cleaning biogas slurry filter have their maintenance cycles significantly extended, and the cleaned biogas slurry filter body can be reused, resulting in low equipment maintenance costs and saving time, labor, and material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a self-cleaning biogas slurry filter in an embodiment of the present application;

[0022] Figure 2 This is an exploded schematic diagram of a self-cleaning filter module in one embodiment of the present application;

[0023] Figure 3 This is a structural diagram of a filter mold unit in one embodiment of the present application;

[0024] Figure 4 This is a schematic diagram of the structure of a biogas slurry recycling system in one embodiment of the present application; Figure numerals:

[0025] 1-Self-cleaning biogas slurry filter;

[0026] 11-feed port;

[0027] 12-filter cartridge;

[0028] 13-discharging port;

[0029] 14-partition;

[0030] 15-rotating support;

[0031] 16-Self-cleaning filter module;

[0032] 161- filter mold unit;

[0033] 1611-first filter plate;

[0034] 1612-support platform;

[0035] 1613-second filter plate;

[0036] 1614-Filter;

[0037] 1615-through hole;

[0038] 162-pull rod;

[0039] 163-locking nut;

[0040] 164-driving rod;

[0041] 1641-stop ring;

[0042] 165-support ring;

[0043] 17-Equipment flange;

[0044] 18-Flat head;

[0045] 19- driving mechanism;

[0046] 191-electric motor;

[0047] 192-shield;

[0048] 193-active worm;

[0049] 194-passive worm gear;

[0050] 110- flange;

[0051] 111-Mechanical seal;

[0052] 112-second slag outlet;

[0053] 113-second filter residue buffer chamber;

[0054] 114-first slag outlet;

[0055] 115-first filter residue buffer chamber;

[0056] 2-MBR processor;

[0057] 3-Nanofiltration equipment;

[0058] 31- nanofiltration column;

[0059] 32-nanofiltration shell;

[0060] 33-Support. DETAILED DESCRIPTION

[0061] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0062] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0063] It should be noted that the terms "first", "second" etc. in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged in appropriate circumstances, so that the embodiments of the application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0064] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element or intervening elements may be present. Moreover, in this application, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.

[0065] Example 1

[0066] Please refer to Figure 1-Figure 3 An embodiment of the present application provides a self-cleaning biogas slurry filter 1, comprising: a filter cartridge 12 for biogas slurry to flow through, a partition 14 fixedly arranged in the filter cartridge 12, and a self-cleaning biogas slurry filter body fixed in the filter cartridge 12; wherein, the filter cartridge 12 has a feed port 11 and a head; the partition 14 divides the space in the filter cartridge 12 into multiple channels; the multiple channels are connected at the ends of the filter cartridge 12; the self-cleaning biogas slurry filter body is rotatably arranged at the connection point of multiple channels; and the self-cleaning biogas slurry filter body is configured as a self-cleaning filter screen module 16, which is used to change the position of a part facing the liquid inlet channel to the liquid outlet channel during rotation to flush the biogas residue adhered to the surface.

[0067] The biogas enters the self-cleaning biogas filter 1 from the feed port 11 and is filtered by the filter 1614. After the biogas is filtered by the lower part of the self-cleaning filter module 16 in the liquid inlet channel, it flows back. The biogas is further filtered by the upper part of the self-cleaning filter module 16 for a second time and then enters the liquid outlet channel and is discharged through the discharge port 13. In this way, multi-stage filtration of the biogas is formed, the filtration is more thorough, and the effect is better. In the above-mentioned filtering operation, after a certain amount of biogas residue adheres to a part of the liquid inlet channel (such as the lower part) of the self-cleaning biogas filter body, the self-cleaning biogas filter body rotates, and the self-cleaning biogas filter body rotates toward the part of the liquid inlet channel to the liquid outlet channel. When the biogas in the liquid outlet channel flows out, the biogas residue is flushed away to complete self-cleaning, which can prevent more biogas residue from continuing to adhere and accumulate to form a biogas residue layer and block the self-cleaning filter module 16.

[0068] In one embodiment, the partition 14 divides the space inside the filter cartridge 12 into two channels. The two channels are respectively a liquid inlet channel and a liquid outlet channel. Preferably, the first end of the partition 14 is close to the feed port 11 of the filter cartridge 12 and is welded and fixed to the inner wall of the filter cartridge 12 (a flat head 18 can be provided here, and the flat head 18 is welded and fixed to the end of the filter cartridge 12; the filter cartridge 12 can also be integrally formed with the flat head 18 to form a barreled structure, and the barreled structure has a bottom seal, and the first end of the partition 14 is fixed on the bottom seal), and the feed port 11 is connected to the liquid inlet channel.

[0069] In one embodiment, a rotating support 15 for securing the self-cleaning biogas slurry filter body is fixedly connected to the middle of the second end of the partition 14. The second end of the partition 14 is positioned near a sealing head, preferably a flat sealing head 18. A space exists between the flat sealing head 18 and the second end of the partition 14, providing a connection point for multiple channels. The self-cleaning filter module 16 is installed within this space.

[0070] In one embodiment, the self-cleaning filter module 16 includes multiple filter mold units 161 arranged in an overlapping manner; a drive rod 164 is passed through the center of the filter mold unit 161; the first end of the drive rod 164 is inserted into the rotating support 15 to form a rotating fit; and a locking nut 163 for fixing the multiple filter mold units 161 is threadedly connected to the drive rod 164. The design of the multiple filter mold units 161 can achieve a better filtering effect. When the outermost filter mold unit 161 reaches the replacement standard, the outermost filter mold unit 161 is removed, and then the second layer of filter mold unit 161 (the second layer of filter mold unit 161 is better contaminated by sludge than the first layer of filter mold unit 161) is pushed to the position of the original first layer and continued to be used. In this way, each layer of filter screen mold unit 161 will be pushed forward to first contact the filtrate to play an initial filtering role, making full use of it and avoiding material waste caused by replacing too many filter screen mold units 161 at a time; at this time, the filter screen mold unit 161 at the back can still be used.

[0071] In one embodiment, the second end of the drive rod 164 is connected to the drive mechanism 19. Preferably, the drive mechanism 19 is disposed outside the filter cartridge 12. The external placement of the drive mechanism 19 avoids contamination of the biogas slurry while also meeting stricter sealing requirements. The drive mechanism 19 can be fixed to the outer wall of the filter cartridge 12 or to the outer wall of the flat head 18. Furthermore, a protective shield 192 is provided on the outer cover of the drive mechanism 19 to prevent workers from being drawn into the power equipment and causing safety accidents.

[0072] In one embodiment, the drive mechanism 19 includes a passive worm gear 194 connected to the second end of the drive rod 164, the passive worm gear 194 is connected to a driving worm 193, and the driving worm 193 is connected to the motor 191. The drive mechanism 19 can also adopt other common drive forms, such as belt drive, chain drive, etc.

[0073] In one embodiment, the self-cleaning filter screen module 16 is further provided with filter residue buffer chambers on the front and rear sides of the filter, both of which are connected to the first channel. The filter residue buffer chambers are divided into a first filter residue buffer chamber 115 and a second filter residue buffer chamber 113. The bottom of the first filter residue buffer chamber 115 is connected to a first filter residue outlet 114, and the bottom of the second filter residue buffer chamber 113 is connected to a second filter residue outlet 112. When a large amount of filter residue accumulates in the filter residue buffer chamber, it can be discharged through the first filter residue outlet 114 and the second filter residue outlet 112.

[0074] Example 2

[0075] Please refer to Figure 1-Figure 3 An embodiment of the present application provides a self-cleaning biogas slurry filter 1, in which biogas enters the self-cleaning biogas slurry filter 1 from a feed inlet 11 and is filtered by a filter screen 1614.

[0076] Specifically, the self-cleaning biogas slurry filter 1 has a filter cartridge 12, in which a partition 14 is fixedly arranged to divide the space inside the filter cartridge 12 into two channels. After the biogas is filtered by the lower part of the self-cleaning filter module 16 in the first channel, it flows back. The biogas slurry continues to be filtered for a second time by the upper part of the self-cleaning filter module 16 and is discharged from the discharge port 13.

[0077] Regarding the self-cleaning biogas slurry filter 1: The first end of the partition 14 is located near the feed inlet 11 and welded to the inner wall of the filter cartridge 12. The feed inlet 11 is connected to the first channel. The second end of the partition 14 is located near the flat end cap 18. A rotating support 15 is fixedly connected to the middle of the second end of the partition 14. The rotating support 15 is used to mount the self-cleaning filter module 16.

[0078] Regarding the self-cleaning filter module 16: Multiple filter mesh modules 161 are arranged in an overlapping arrangement, with a drive rod 164 extending through the center. The drive rod 164 has an externally threaded section, onto which a locking nut 163 is mounted. The locking nut 163 secures the multiple filter mesh modules 161. The first end of the drive rod 164 is inserted into the rotating support 15, forming a rotational fit. The second end of the drive rod 164 is connected to the drive mechanism 19. A stop is provided at the first end of the drive rod 164 to limit the insertion depth of the first end of the drive rod 164, preventing excessive friction from affecting the rotation of the self-cleaning filter module 16 by the drive rod 164. Preferably, the second end of the drive rod 164 extends out of the flat seal 18. The drive mechanism 19 is disposed outside the filter cartridge 12. A flange 110 is provided at the center of the flat seal 18. A mechanical seal 111 is provided within the flange 110 to cooperate with the drive rod 164 and seal the filtrate to prevent leakage. Of course, the second end of the driving rod 164 can also extend from the body of the filter cartridge 12 and connect to the driving mechanism 19. At this time, the flange 110 and the mechanical seal 111 can also be provided in conjunction.

[0079] The drive mechanism 19 includes a passive worm gear 194 connected to the second end of the drive rod 164. The passive worm gear 194 is connected to the active worm 193, which is driven by the motor 191. The passive worm gear 194, the active worm 193, and the motor 191 are covered with a protective cover 192. The self-cleaning filter module 16 operates as follows: after the biogas slurry enters the first channel, it is filtered by the lower portion of the self-cleaning filter module 16 for the first time, then flows back. The biogas slurry is then filtered by the upper portion of the self-cleaning filter module 16 for the second time before being discharged from the discharge port 13. After a period of operation, the liquid inlet surface of the lower portion and the liquid inlet surface of the upper portion of the self-cleaning filter module 16 are both contaminated by biogas residue and clogged, causing the filtering capacity of the self-cleaning filter module 16 to decrease and the pressure drop of the self-cleaning biogas filter 1 to increase. At this point, the self-cleaning filter module 16 is rotated half a turn by the drive mechanism 19, so that the lower portion of the self-cleaning filter module 16 is located in the second channel and the upper portion of the self-cleaning filter module 16 is located in the first channel. At this point, the liquid inlet surface of the lower portion becomes the liquid outlet surface in the second channel; when liquid is discharged, the direction of discharge is opposite to the original inlet direction, which can flush away any filter residue adhering to the lower portion. The liquid inlet surface of the upper portion becomes the liquid outlet surface in the first channel; when liquid is discharged, the direction of discharge is opposite to the original inlet direction, which can flush away any filter residue adhering to the lower portion. Biogas slurry continues to be introduced for filtration, and as the filtrate emerges, it flushes away any filter residue adhering to the filter module unit 161, thus achieving a self-cleaning effect. Furthermore, the self-cleaning filter module 16 can be rotated and replaced more frequently, shortening the self-cleaning cycle. This allows the filter module unit 161 to promptly or prematurely remove any filter residue adhering to it, resulting in a more effective cleaning effect. Furthermore, the self-cleaning filter module 16 can be made to rotate continuously, and the speed control is performed at a low speed, so that the filter module unit 161 can continuously change its position, so that the filter module unit 161 is not easy to adhere to the sludge. The self-cleaning filter module 16 may need to be maintained regularly. In a traditional single-filter operation, the pollution level of the filter module unit 161 decreases piece by piece from the liquid inlet side to the liquid outlet side; when the first filter module unit 161 on the liquid inlet side is seriously polluted and needs maintenance, the first filter module unit 161 on the liquid outlet side often does not meet the maintenance standard. At this time, maintenance wastes a certain amount of manpower and material resources. With the present self-cleaning filter module 16, the pollution level of all filter module units 161 is equivalent, and maintenance is performed only when it reaches a certain level; the period for regular maintenance of the self-cleaning filter module 16 is long.

[0080] To enhance the stability of the multi-piece filter mold unit 161, a pull rod 162 is provided. The pull rod 162 passes through a through hole 1615 formed in the multi-piece filter mold unit 161 to secure the filter mold unit 161. Furthermore, the filter mold unit 161 includes a first filter plate 1611 and a second filter plate 1613; a filter screen 1614 is clamped between the first filter plate 1611 and the second filter plate 1613. To facilitate assembly of two adjacent filter mold units 161, the two are held tightly together. The second filter plate 1613 is concave in shape, and a support 1612 is fixed to its surface to support the first filter plate 1611 of the other filter mold unit 161. Therefore, the first filter plate 1611 is convex in shape and inserted into and engages with the second filter plate 1613. A support ring 165 is further provided between two adjacent filter screen mold units 161 . The support ring 165 is sleeved outside the pull rod 162 to prevent the pull rod 162 from being locked too tightly and compressing the filter screen mold unit 161 so as to cause deformation or damage.

[0081] In the above technical solution, filter residue buffer chambers are further provided on the front and rear sides of the self-cleaning filter screen module 16, both of which are connected to the first channel. The filter residue buffer chambers are divided into a first filter residue buffer chamber 115 and a second filter residue buffer chamber 113. The bottom of the first filter residue buffer chamber 115 is connected to a first filter residue outlet 114, and the bottom of the second filter residue buffer chamber 113 is connected to a second filter residue outlet 112. When a large amount of filter residue accumulates in the filter residue buffer chambers, it can be discharged through the first filter residue outlet 114 and the second filter residue outlet 112.

[0082] In addition, in order to facilitate the installation of the self-cleaning filter module 16, an equipment flange 17 is provided at the end of the filter cartridge 12 near the flat head 18. The equipment flange 17 is used to connect the flat head 18 and the filter cartridge 12. After the equipment flange 17 is removed, the self-cleaning filter module 16 can be easily inspected.

[0083] Example 3

[0084] Please refer to Figures 1-4 One embodiment of the present application provides a biogas slurry recycling system, comprising a self-cleaning biogas slurry filter 1 as described in the above embodiment; the discharge port 13 of the self-cleaning biogas slurry filter 1 is sequentially connected to an MBR processor 2 and a nanofiltration device 3. The biogas slurry flows out of the self-cleaning biogas slurry filter 1, and some biogas residue is still present. It undergoes physical filtration again, and then sequentially undergoes multiple membrane filtrations. After the filtration of the previous membrane is completed, it enters the subsequent membrane; the membranes also gradually become denser, through microfiltration, ultrafiltration, nanofiltration, and reverse osmosis.

[0085] In one embodiment, the nanofiltration device 3 includes a nanofiltration housing 32 ; a plurality of nanofiltration modules 31 for filtration are fixed in the nanofiltration housing 32 .

[0086] Biogas enters the self-cleaning biogas filter 1 through the feed inlet 11 and is filtered through the filter 1614. The self-cleaning biogas filter 1 comprises a filter cartridge 12, which is fixed with a partition 14 that divides the space within the cartridge 12 into two channels. In the first channel, biogas is filtered by the lower portion of the self-cleaning filter module 16 before flowing back. The biogas is then filtered a second time by the upper portion of the self-cleaning filter module 16 before being discharged through the discharge port 13. This creates a multi-stage filtration process for biogas, providing more thorough filtration and improved results. After entering the first channel, biogas is filtered by the lower portion of the self-cleaning filter module 16 before flowing back. The biogas is then filtered a second time by the upper portion of the self-cleaning filter module 16 before being discharged through the discharge port 13. After a period of operation, both the lower and upper liquid inlet surfaces of the self-cleaning filter module 16 become contaminated and clogged with biogas residue, reducing the filtering capacity of the self-cleaning filter module 16 and increasing the pressure drop across the self-cleaning biogas filter 1. At this time, the self-cleaning filter module 16 rotates half a circle, so that the lower part of the self-cleaning filter module 16 is located in the second channel, and the upper part of the self-cleaning filter module 16 is located in the first channel. At the same time, the liquid inlet surface of the lower part becomes the liquid outlet surface in the second channel; at this time, when the liquid is discharged, the liquid outlet direction is opposite to the original liquid inlet direction, and the filter residue adhering to the lower part can be washed away. The liquid inlet surface of the upper part becomes the liquid outlet surface in the first channel; at this time, when the liquid is discharged, the liquid outlet direction is opposite to the original liquid inlet direction, and the filter residue adhering to the lower part can be washed away. Continue to pass the biogas slurry for filtration, and when the filtrate is filtered out, it washes the filter residue adhering to the filter module unit 161, thereby playing a self-cleaning role.

[0087] The biogas slurry filtered and treated by the self-cleaning biogas slurry filter 1 is passed into the MBR processor 2 for treatment, and then enters the nanofiltration device 3 and is filtered by multiple nanofiltration columns 31. The filtrate produced by the filtration of the nanofiltration columns 31 can be discharged to the outside or recycled for secondary use. Concentrated liquid will be produced in the nanofiltration shell 32 as the filtrate is filtered out; the concentrated liquid can be further made into liquid fertilizer. The nanofiltration device 3 can be arranged above the self-cleaning biogas slurry filter 1 and fixed by the support 33. At this time, a support base is set at the bottom of the first filter residue buffer chamber 115 and the second filter residue buffer chamber 113 for supporting the biogas slurry recovery and utilization system.

[0088] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A self-cleaning biogas slurry filter, characterized in that: include: A filter cartridge for biogas slurry to flow through; the filter cartridge has a feed port and a sealing head; A partition is fixedly arranged in the filter cartridge; the partition divides the space in the filter cartridge into a plurality of channels; The plurality of channels are connected at the end of the filter cartridge; and A self-cleaning biogas slurry filter body is fixed in the filter cartridge; the self-cleaning biogas slurry filter body is rotatably arranged at the connection point of the multiple channels; a space is provided between the second end of the partition and the head near the second end of the partition, and the space is the connection point of the multiple channels; The self-cleaning biogas slurry filter body is configured as a self-cleaning filter screen module, which is used to change the position of a portion facing the liquid inlet channel to the liquid outlet channel during rotation to flush the biogas residue adhered to the surface.

2. A self-cleaning biogas slurry filter according to claim 1, characterized in that: The partition separates the space in the filter cartridge into two channels.

3. A self-cleaning biogas slurry filter according to claim 1 or 2, characterized in that: The first end of the partition is close to the feed port of the filter cartridge and is welded to the inner wall of the filter cartridge, and the feed port is connected to the liquid inlet channel; the middle position of the second end of the partition is fixedly connected to a rotating support for fixing the self-cleaning biogas slurry filter body.

4. A self-cleaning biogas slurry filter according to claim 3, characterized in that: The self-cleaning filter module includes multiple filter module units arranged in an overlapping manner; a drive rod is provided at the center of the filter module unit; the first end of the drive rod is inserted into the rotating support to form a rotating fit; a locking nut for fixing the multiple filter module units is threadedly connected to the drive rod.

5. The self-cleaning biogas slurry filter according to claim 4, characterized in that: The second end of the driving rod is connected to the driving mechanism.

6. The self-cleaning biogas slurry filter according to claim 5, characterized in that: The driving mechanism is arranged outside the filter cartridge.

7. A self-cleaning biogas slurry filter according to claim 5 or 6, characterized in that: The driving mechanism includes a passive worm gear connected to the second end of the driving rod, the passive worm gear is connected to the active worm, and the active worm is transmission-connected to the motor.

8. The self-cleaning biogas slurry filter according to claim 1, characterized in that: The self-cleaning filter screen module is further provided with filter residue buffer chambers on the front and rear sides of the filter, and the filter residue buffer chambers are both connected to the first channel.

9. A biogas slurry recycling system, characterized in that: The self-cleaning biogas slurry filter comprises the self-cleaning biogas slurry filter according to any one of claims 1 to 8; the discharge port of the self-cleaning biogas slurry filter is connected to the MBR processor and the nanofiltration equipment in sequence.

10. The biogas slurry recycling system according to claim 9, characterized in that: The nanofiltration equipment comprises a nanofiltration shell; a plurality of nanofiltration module columns for filtration are fixed in the nanofiltration shell.

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