A kitchen waste biogas liquid pretreatment device

Abstract

This utility model relates to the technical field of kitchen waste treatment devices, and in particular to a kitchen waste biogas slurry pretreatment device, including a filter box for solid-liquid separation, cleaning components symmetrically arranged on the filter box for cleaning and anti-clogging operations, modularly detachable solid material storage boxes at both ends of the filter box for storing solid impurities, a centrifugal treatment tank for centrifugal rotational separation and filtration connected to the bottom of the filter box, and a deep filter box for deep separation operations surrounding the centrifugal treatment tank; the surface of the filter plate is dynamically rotated and cleaned by the symmetrically distributed cleaning components, combined with the multi-angle coverage of the swing frame, effectively solving the problem of grease and fiber residue easily remaining in traditional fixed filter screens; a three-stage linkage operation mode of filter box, centrifugal tank and deep filter box is adopted, the filter plate is driven to rotate by the first drive motor to achieve coarse screening and interception, and the centrifugal treatment tank achieves secondary solid-liquid separation by high-speed rotation of the centrifugal rod, improving the overall treatment effect.

Description

Technical Field

[0001] This utility model relates to the technical field of kitchen waste treatment devices, and in particular to a kitchen waste biogas slurry pretreatment device. Background Technology

[0002] Kitchen waste biogas slurry is a liquid byproduct produced by anaerobic fermentation of pre-treated kitchen waste. It is mainly formed by the decomposition of organic matter and contains a large amount of soluble nutrients and bioactive substances. Impurities (such as grease and solid residues) are separated by physical or chemical methods, and the particle size and moisture content of the material are adjusted by the pre-treatment device to ensure the stability of subsequent fermentation and the quality of biogas slurry.

[0003] Traditional kitchen waste biogas slurry pretreatment devices separate solid residues from liquid components in kitchen waste using mechanical screens (such as bar screens or screw presses). After being crushed, the kitchen waste enters the solid-liquid separation unit. The separated solid residues are transported off-site for disposal, while the liquid biogas slurry flows into an equalization tank for pH adjustment or simple aeration, and then enters a sedimentation tank to remove suspended particles. The screens are prone to clogging (especially when the oil and fiber content is high), resulting in incomplete separation. Residual solids affect subsequent treatment and reduce the overall efficiency. Utility Model Content

[0004] In order to overcome the problem that the screen of the pretreatment device for kitchen waste biogas slurry is prone to clogging (especially when the content of oil and fiber is high), resulting in incomplete separation and residual solids affecting subsequent processing, this utility model provides a pretreatment device for kitchen waste biogas slurry.

[0005] The technical solution is as follows: A kitchen waste biogas slurry pretreatment device includes a filter box for solid-liquid separation treatment, a cleaning component symmetrically arranged on the filter box for cleaning and anti-clogging operation, and a modularly detachable solid material storage box at both ends of the filter box for storing solid impurities. A centrifugal treatment tank for centrifugal rotation separation filtration is connected to the bottom of the filter box, and a deep filter box for deep separation treatment operation is fitted around the centrifugal treatment tank.

[0006] Furthermore, the bottom of the filter box is connected to an electromagnetic control valve module that docks with the centrifuge tank. Both ends of the filter box are fixed with corresponding disassembly sleeves for solid material storage boxes. Both ends of the electromagnetic control valve module are equipped with support plates to support the solid material storage boxes. The filter box is symmetrically equipped with filter plates for solid-liquid separation. Several filter holes are distributed on the filter plates. A steering rod is provided between the filter plates and the filter box. One end of the steering rod is fitted with a protective sleeve that is fixed to the filter box. The other end of the steering rod is connected to a first drive motor. The first drive motor drives the steering rod to rotate the filter plates.

[0007] Furthermore, the cleaning component includes a swing frame and a positioning frame. One end of the swing frame is provided with a connecting post that is fixedly connected to the filter box. A connecting ring that is fixedly connected to the swing frame is sleeved on the connecting post. One end of the connecting post is connected to a second drive motor. A positioning frame that positions the second drive motor is sleeved on the connecting post. The end of the positioning frame away from the connecting post is provided with a fixing post that is fixedly connected to one end of the filter box. The second drive motor drives the connecting ring to drive the swing frame to swing.

[0008] Furthermore, a rotating column is provided at the end of the swing frame away from the connecting ring, and a rotating ring is provided between the rotating column and the swing frame. A curved frame is fixedly connected at the end of the rotating column away from the swing frame, and a cleaning rod is fixedly connected at the end of the curved frame away from the rotating column. A driving rotating column is provided at the outer end of the swing frame, and a lithium battery module is connected to one end. A rotator is connected inside one end of the rotating column. The lithium battery module electrically drives the rotator to rotate the rotating column and the cleaning rod.

[0009] Furthermore, the outer end of the cleaning rod is provided with several sets of cleaning brushes in a circumferential linear arrangement, and a spray pipe is provided between two sets of cleaning brushes. A water pipe module is provided in the center of the cleaning rod. The water pipe module includes a magnetic disassembly cover, a water pipe and a storage pipe. The magnetic disassembly cover, the water pipe and the storage pipe are connected in sequence. The spray pipe is connected to the water pipe, and an ejector is provided inside the spray pipe.

[0010] Furthermore, the centrifuge tank has a sealed barrel at its center that is connected to the depth filtration box. Several sets of unidirectional filter membranes are arranged around the outer end of the sealed barrel. A rotating frame is located at the center of the sealed barrel. Several sets of centrifugal rods are fixed around the outer end of the rotating frame. A third drive motor is connected to the bottom of the rotating frame. The third drive motor drives the rotating frame to rotate the centrifugal rods.

[0011] Furthermore, the interior of the depth filtration box is provided with several sets of sedimentation plates from bottom to top, and several sets of sedimentation holes are distributed on the sedimentation plates. The sedimentation holes are provided with one-way filter membranes. The center of the several sets of sedimentation plates is provided with corresponding centrifugal processing tank adapter holes. The exterior of the depth filtration box is covered with a heat insulation sleeve.

[0012] Furthermore, the bottom of the depth filtration box is provided with several sets of drain pipes, the inside of the depth filtration box is connected to a heating plate, the heating plate is provided with a heating coil, the heating coil is electrically connected to a heating module, the side wall of the depth filtration box is provided with several sets of ultrasonic modules, the ultrasonic modules are electrically connected to a control box, and the ultrasonic modules include an ultrasonic transmitter, an ultrasonic receiver and a wireless module that are electrically connected to each other.

[0013] The beneficial effects are: the modular solid material storage boxes set at both ends of the filter box of this utility model can be quickly disassembled and cleaned of solid impurities through the disassembly sleeve design, avoiding the problem of screen clogging caused by the accumulation of fiber and oil, and significantly improving maintenance efficiency;

[0014] The surface of the filter plate is dynamically rotated and cleaned by symmetrically distributed cleaning components, combined with the multi-angle coverage of the swing frame, which effectively solves the problem of grease and fiber residue in traditional fixed filter screens.

[0015] The system adopts a three-stage linkage operation mode consisting of a filter box, a centrifuge tank, and a deep filtration box. The filter plate is driven by the first drive motor to achieve coarse screening and retention, while the centrifuge tank achieves secondary solid-liquid separation through high-speed rotation of the centrifuge rod, thereby improving the overall treatment effect. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a pretreatment device for kitchen waste biogas slurry according to the present invention;

[0017] Figure 2 This is a schematic diagram of the filter box of this utility model;

[0018] Figure 3 This is a schematic diagram of the cleaning component of this utility model;

[0019] Figure 4 This is an exploded schematic diagram of the depth filter box of this utility model;

[0020] Figure 5 This is a schematic diagram of the depth filter box of this utility model from another angle.

[0021] In the attached diagram, the following are the reference numerals: 1. Filter box; 2. Solid material storage box; 3. Cleaning assembly; 4. Depth filtration box; 5. Centrifuge tank; 101. Filter plate; 102. Filter hole; 103. Steering rod; 104. First drive motor; 105. Protective sleeve; 106. Electromagnetic control valve module; 107. Support plate; 301. Swing frame; 302. Positioning frame; 303. Fixed column; 304. Connecting column; 305. Connecting ring; 306. Second drive motor; 307. Rotating column; 308. Rotation. 309. Ring; 310. Lithium battery module; 311. Curved frame; 312. Cleaning rod; 313. Cleaning brush; 314. Water pipe module; 315. Spray pipe; 406. Sedimentation plate; 407. Adapter hole; 408. Sedimentation hole; 409. Ultrasonic module; 400. Insulation sleeve; 401. Heating plate; 402. Control box; 403. Drain pipe; 404. Heating module; 505. Sealed barrel; 506. One-way filter membrane; 507. Rotating frame; 508. Centrifuge rod; 509. Third drive motor. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] Kitchen waste, a major component of urban organic waste, accounts for approximately 40%-60% of total household waste. Its high water content (70%-90%), high organic matter content (over 60% of which is readily biodegradable), and complex composition (oils, fibers, salts, etc.) make it prone to producing large amounts of biogas slurry during anaerobic fermentation. Kitchen waste biogas slurry is a liquid byproduct formed after kitchen waste undergoes crushing, hydrolysis, acidification, and anaerobic fermentation, and has the following characteristics:

[0024] Complex composition: Contains incompletely degraded organic matter (such as polysaccharides and proteins), soluble nutrients (nitrogen, phosphorus, and potassium), oils (3%-15%), fiber residues (2%-10%), and microbial metabolites;

[0025] Environmental risks: Direct discharge can lead to eutrophication of water bodies and acidification of soil, while high concentrations of COD (10,000-50,000 mg / L) and suspended solids (SS > 2,000 mg / L) will burden subsequent treatment processes (such as membrane separation and biochemical reactions).

[0026] Resource potential: Biogas slurry is rich in bioactive substances such as humic acid and amino acids, which can be processed into liquid organic fertilizer or industrial raw materials, but it needs to be treated efficiently to remove impurities in order to improve its quality.

[0027] For agricultural applications

[0028] liquid fertilizer

[0029] As a base fertilizer or top dressing, it can be used directly by irrigation or in combination with drip irrigation to improve crop yield and quality.

[0030] Foliar spraying can regulate metabolism, enhance stress resistance, and reduce pests and diseases (such as aphids and spider mites) 56.

[0031] Seed treatment

[0032] Soaking seeds can improve germination rate and seedling rate, improve root development, and reduce the risk of disease transmission through antibacterial substances.

[0033] Soilless cultivation nutrient solution

[0034] It replaces chemical nutrient solutions, simplifies the preparation process, and is suitable for hydroponics of fruits and vegetables.

[0035] Environmental and economic benefits

[0036] Resource utilization

[0037] Reduce secondary pollution caused by direct emissions and lower the cost of kitchen waste treatment (accounting for 60%-80% of operating costs);

[0038] Improve soil structure, increase organic matter content, and reduce the use of chemical fertilizers and pesticides.

[0039] Precautions

[0040] It must be diluted before application to avoid burning crops due to excessive concentration;

[0041] Prioritize biogas slurry that has been fully fermented and is free of heavy metal contamination.

[0042] Therefore, the pretreatment of kitchen waste biogas slurry needs to achieve two core objectives:

[0043] Highly efficient solid-liquid separation: retains fibers, undegraded solids and grease, reducing the load on subsequent processing units;

[0044] Material property optimization: Adjust particle size (target <1mm), moisture content (reduce to below 80%) and flowability to ensure the stability of subsequent fermentation and consistency with the resource-based products.

[0045] Industry Demands and Technological Upgrade Directions

[0046] By 2025, my country's food waste treatment capacity needs to reach 200,000 tons / day, corresponding to a demand for biogas slurry treatment exceeding 500 million tons / year. However, existing pretreatment equipment is insufficient to meet the demands for large-scale, resource-based, and low-carbon development, making technological upgrades urgently needed.

[0047] Highly efficient anti-clogging and self-cleaning design

[0048] Background: The adhesion of grease and fiber in kitchen waste biogas slurry leads to a clogging rate of 60%-80% in equipment. Dynamic cleaning mechanisms (such as rotary scrubbing and high-pressure backflushing) need to be developed to extend the continuous operation cycle.

[0049] Technical direction: Combining mechanical scraping and water washing to achieve real-time cleaning of the screen surface; adopting a modular filter plate design to support quick replacement and maintenance.

[0050] Multi-stage synergistic separation process

[0051] Background: Single separation technology is insufficient to handle complex material characteristics. It is necessary to construct a multi-stage system of "coarse screening-centrifugation-deep filtration" to gradually reduce the load and improve the separation accuracy.

[0052] Technical directions: The filtration unit focuses on retaining large solid particles, the centrifugation unit enhances the separation of emulsified oils, and the deep filtration unit achieves micron-level purification through the coupling of gradient filter membranes with physical fields (ultrasound, heating).

[0053] Intelligent control and energy efficiency optimization

[0054] Background: Traditional equipment relies on experience for operation and is difficult to dynamically respond to fluctuations in parameters such as material concentration and temperature, resulting in energy waste and unstable treatment effects.

[0055] Adjusting material properties

[0056] Reducing the moisture content of kitchen waste (usually from 80%-90% to 60%-70%) optimizes the carbon-to-nitrogen ratio (C / N), making fermentation conditions more stable and improving gas production efficiency.

[0057] Crushing technology reduces particle size, increases material surface area, accelerates microbial decomposition, and shortens the fermentation cycle.

[0058] Hazardous substance separation and resource recycling

[0059] Waste oil in kitchen waste is recovered by an oil separation device and produced as feedstock for biodiesel, reducing the oil content in biogas slurry (and reducing the risk of pipe blockage).

[0060] Separating some salts and heavy metals reduces the risk of soil pollution that may result from the direct agricultural use of biogas slurry.

[0061] Reduce subsequent processing costs

[0062] Pretreatment can reduce the load on the biogas slurry treatment system, avoid the difficulty of biochemical treatment due to high concentrations of organic matter and suspended solids, and save on the amount of reagents and energy consumption (for example, the COD of the filtrate is reduced by 30%-50%).

[0063] Resource recycling (such as oils and grease, and organic solids) can offset some of the processing costs and improve overall economic efficiency.

[0064] like Figure 1 - Figure 5 As shown, a kitchen waste biogas slurry pretreatment device includes a filter box 1 for solid-liquid separation treatment, a cleaning component 3 symmetrically arranged on the filter box 1 for cleaning and anti-clogging operation, a modularly detachable solid material storage box 2 for storing solid impurities at both ends of the filter box 1, a centrifugal treatment tank 5 for centrifugal rotation separation and filtration connected to the bottom of the filter box 1, and a deep filter box 4 for deep separation treatment operation surrounding the centrifugal treatment tank 5.

[0065] Please see Figure 2 - Figure 4In this embodiment, the bottom of the filter box 1 is connected to an electromagnetic control valve module 106 that docks with the centrifugal processing tank 5. Both ends of the filter box 1 are fixed with corresponding disassembly sleeves for the solid material storage box 2. Both ends of the electromagnetic control valve module 106 are provided with support plates 107 to support the solid material storage box 2. The filter box 1 is symmetrically equipped with filter plates 101 for solid-liquid separation. Several filter holes 102 are distributed on the filter plates 101. A steering rod 103 is provided between the filter plates 101 and the filter box 1. One end of the steering rod 103 is fitted with a protective sleeve 105 fixed to the filter box 1, and the other end of the steering rod 103 is connected to a first drive motor 104. The machine 104 drives the steering rod 103 to rotate the filter plate 101. The cleaning component 3 includes a swing frame 301 and a positioning frame 302. One end of the swing frame 301 is provided with a connecting post 304 that is fixedly connected to the filter box 1. A connecting ring 305 that is fixedly connected to the swing frame 301 is sleeved on the connecting post 304. One end of the connecting post 304 is connected to a second drive motor 306. The positioning frame 302 that positions the second drive motor 306 is sleeved on the connecting post 304. The end of the positioning frame 302 away from the connecting post 304 is provided with a fixing post 303 that is fixedly connected to one end of the filter box 1. The second drive motor 306 drives the connecting ring 305 to make the swing frame 301 swing.

[0066] Please see Figure 3 - Figure 4 In this embodiment, a rotating column 307 is provided at the end of the swing frame 301 away from the connecting ring 305. A rotating ring 308 is provided between the rotating column 307 and the swing frame 301. A curved frame 310 is fixedly connected to the end of the rotating column 307 away from the swing frame 301. A cleaning rod 311 is fixedly connected to the end of the curved frame 310 away from the rotating column 307. A driving rotating column 307 is provided at the outer end of the swing frame 301, and a lithium battery module 309 is connected to one end of the rotating column 307. A rotator is connected inside one end of the rotating column 307. Group 309 electrically drives the rotating column 307 and the cleaning rod 311 to rotate. The outer end of the cleaning rod 311 is provided with several sets of cleaning brushes 312 in a circumferential linear manner. A spray pipe 314 is provided between two sets of cleaning brushes 312. A water pipe module 313 is provided in the center of the cleaning rod 311. The water pipe module 313 includes a magnetic disassembly cover, a water pipe and a storage pipe. The magnetic disassembly cover, the water pipe and the storage pipe are connected in sequence. The spray pipe 314 is connected to the water pipe. A sprayer is provided inside the spray pipe 314.

[0067] Please see Figure 4 - Figure 5In this embodiment, the centrifuge tank 5 has a sealed barrel 501 at its center, which is connected to the depth filter box 4. Several sets of unidirectional filter membranes 502 are arranged circumferentially around the outer end of the sealed barrel 501. A rotating frame 503 is located at the center of the sealed barrel 501. Several sets of centrifuge rods 504 are fixedly connected circumferentially around the outer end of the rotating frame 503. A third drive motor is connected to the bottom of the rotating frame 503. 505, Third drive motor. The drive unit 505 rotates the centrifuge rod 504. The interior of the depth filtration chamber 4 is equipped with several sets of sedimentation plates 401 from bottom to top. Several sets of sedimentation holes 403 are distributed on the sedimentation plates 401, and a one-way filter membrane is installed inside each sedimentation hole 403. Corresponding adapter holes 402 are opened in the center of each sedimentation plate 401. The exterior of the depth filtration chamber 4 is covered with a heat insulation sleeve 405. Several sets of drain pipes 408 are distributed at the bottom of the depth filtration chamber 4. Heating plates 406 are connected around the interior of the depth filtration chamber 4. Heating coils are installed inside the heating plates 406, and heating modules 409 are electrically connected to the exterior of the heating coils. Several sets of ultrasonic modules 404 are distributed on the side walls of the depth filtration chamber 4. Control boxes 407 are electrically connected to the exterior of each ultrasonic module 404. Each ultrasonic module 404 includes an ultrasonic transmitter, an ultrasonic receiver, and a wireless module that are electrically connected to each other.

[0068] After the kitchen waste biogas slurry enters the filtration box 1, the filtration plate 101 (with a pore size of 2-5mm, customizable) is periodically deflected at 15-30 r / min under the drive of the steering rod 103, causing large solid particles to slide into the solid storage boxes 2 on both sides. Simultaneously, the cleaning component 3 is activated, and the second drive motor 306 drives the swing frame 301 to swing back and forth at a 10° angle, causing the cleaning rod 311 (speed 200-500 r / min) at the end of the curved frame 310 to rotate along the surface of the filtration plate 101. The cleaning brush 312 scrapes off the attached substances, and the spray pipe 314 rinses the sieve holes with high-pressure water (0.5-1 MPa). The magnetic disassembly cover design facilitates periodic replacement of worn brushes.

[0069] The liquid, controlled by the solenoid valve, enters the centrifugal processing tank 5, and the third drive motor 505 drives the centrifugal rod 504 to rotate at a high speed of 3000-6000 r / min, generating a centrifugal acceleration of ≥800g, which causes particles larger than 5μm to be thrown to the outer wall of the sealed tank 501 and intercepted by the one-way filter membrane 502. The clear liquid enters the depth filtration box 4.

[0070] The liquid flows through the multi-layer sedimentation plate 401 (the pore size decreases step by step to 0.1mm), and the unidirectional filter membrane blocks the backflow. The heating plate 406 maintains the liquid temperature at 40-50℃ to reduce the viscosity. The ultrasonic module 404 emits high-frequency pulses to break up the colloidal particles. Finally, the purified liquid is output from the bottom drain pipe 408.

[0071] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pretreatment device for kitchen waste biogas slurry, comprising a filter box (1) for solid-liquid separation treatment, characterized in that: It also includes a cleaning component (3) symmetrically arranged on the filter box (1) for cleaning and anti-clogging operation. Both ends of the filter box (1) are provided with modular disassembly solid material storage boxes (2) for storing solid impurities. The filter box (1) is connected to a centrifugal treatment tank (5) for centrifugal rotation separation filtration. The centrifugal treatment tank (5) is surrounded by a deep filter box (4) for deep separation operation.

2. The pretreatment device for kitchen waste biogas slurry according to claim 1, characterized in that, The bottom of the filter box (1) is connected to an electromagnetic control valve module (106) that docks with the centrifugal treatment tank (5). Both ends of the filter box (1) are fixed with disassembly sleeves for corresponding solid material storage boxes (2). Both ends of the electromagnetic control valve module (106) are provided with support plates (107) for supporting solid material storage boxes (2). The filter box (1) is symmetrically provided with filter plates (101) for solid-liquid separation. Several filter holes (102) are distributed on the filter plates (101). A steering rod (103) is provided between the filter plates (101) and the filter box (1). One end of the steering rod (103) is fitted with a protective sleeve (105) that is fixed to the filter box (1). The other end of the steering rod (103) is connected to a first drive motor (104). The first drive motor (104) drives the steering rod (103) to drive the filter plates (101) to turn.

3. The pretreatment device for kitchen waste biogas slurry according to claim 1, characterized in that, The cleaning component (3) includes a swing frame (301) and a positioning frame (302). One end of the swing frame (301) is provided with a connecting post (304) that is fixedly connected to the filter box (1). A connecting ring (305) that is fixedly connected to the swing frame (301) is sleeved on the connecting post (304). One end of the connecting post (304) is connected to a second drive motor (306). The positioning frame (302) that positions the second drive motor (306) is sleeved on the connecting post (304). The end of the positioning frame (302) away from the connecting post (304) is provided with a fixing post (303) that is fixedly connected to one end of the filter box (1). The second drive motor (306) drives the connecting ring (305) to drive the swing frame (301) to swing.

4. The pretreatment device for kitchen waste biogas slurry according to claim 3, characterized in that, A rotating column (307) is provided at the end of the swing frame (301) away from the connecting ring (305). A rotating ring (308) is provided between the rotating column (307) and the swing frame (301). A curved frame (310) is fixedly connected at the end of the rotating column (307) away from the swing frame (301). A cleaning rod (311) is fixedly connected at the end of the curved frame (310) away from the rotating column (307). A driving rotating column (307) is provided at the outer end of the swing frame (301). A lithium battery module (309) is connected at one end of the rotating column (307). A rotator is connected inside one end of the rotating column (307). The lithium battery module (309) electrically drives the rotator to rotate the rotating column (307) and the cleaning rod (311).

5. The pretreatment device for kitchen waste biogas slurry according to claim 4, characterized in that, The outer end of the cleaning rod (311) is provided with several sets of cleaning brushes (312) arranged in a circumferential linear manner. A spray pipe (314) is provided between two sets of cleaning brushes (312). A water pipe module (313) is provided in the center of the cleaning rod (311). The water pipe module (313) includes a magnetic disassembly cover, a water pipe and a storage pipe. The magnetic disassembly cover, the water pipe and the storage pipe are connected in sequence. The spray pipe (314) is connected to the water pipe. A sprayer is provided inside the spray pipe (314).

6. The pretreatment device for kitchen waste biogas slurry according to claim 1, characterized in that, The centrifuge tank (5) has a sealed barrel (501) connected to the depth filter box (4) at its center. Several sets of unidirectional filter membranes (502) are arranged around the outer end of the sealed barrel (501). A rotating frame (503) is arranged at the center of the sealed barrel (501). Several sets of centrifugal rods (504) are fixed around the outer end of the rotating frame (503). A third drive motor (505) is connected to the bottom of the rotating frame (503). The third drive motor (505) drives the rotating frame (503) to rotate the centrifugal rods (504).

7. The pretreatment device for kitchen waste biogas slurry according to claim 1, characterized in that, The interior of the depth filter box (4) is provided with several sets of sedimentation plates (401) from bottom to top. Several sets of sedimentation holes (403) are distributed on the sedimentation plates (401). The sedimentation holes (403) are provided with a one-way filter membrane. The center of the several sets of sedimentation plates (401) is provided with a corresponding adapter hole (402) for the centrifugal treatment tank (5). The exterior of the depth filter box (4) is covered with a heat insulation sleeve (405).

8. The pretreatment device for kitchen waste biogas slurry according to claim 1, characterized in that, Several sets of drain pipes (408) are distributed at the bottom of the depth filtration box (4). A heating plate (406) is connected around the inside of the depth filtration box (4). A heating coil is provided inside the heating plate (406). A heating module (409) is electrically connected to the outside of the heating coil. Several sets of ultrasonic modules (404) are distributed on the side wall of the depth filtration box (4). A control box (407) is electrically connected to the outside of the ultrasonic module (404). The ultrasonic module (404) includes an ultrasonic transmitter, an ultrasonic receiver and a wireless module that are electrically connected to each other.

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