Salt reduction treatment system and method for kitchen waste

Abstract

This application discloses a desalination system and method for kitchen waste. The system includes a filter press chamber, a feeding chamber, a washing chamber, an oil-water buffer tank, and a solid material silo connected in sequence. The filter press chamber is equipped with a cross-shaped rotating filter plate and a filter press pusher cylinder to achieve preliminary desalination of kitchen waste through filter pressing. The feeding chamber transports the solid material after filter pressing to the washing chamber through a feeding mechanism. The spray pipes and circulating pump in the washing chamber form a hot water circulating spray system. The oil-water mixture at the bottom of the washing chamber enters the oil-water buffer tank through an overflow hole, and the oil and water are automatically separated by a capacitive oil level sensor and an electrically controlled valve. The receiving screen sends the desalinated solid material into the solid material silo. By adopting the above solution, this invention can solve the technical problems of low salt removal efficiency and waste of resources, difficulty in separating oil and water layers that easily leads to secondary pollution, low degree of process automation resulting in cumbersome and unstable operation, low equipment integration and poor compatibility with existing production lines of livestock and poultry manure treatment enterprises in the current pretreatment of kitchen waste.

Description

Technical Field

[0001] This invention relates to the field of organic waste treatment equipment technology, specifically a desalination system and method for kitchen waste. Background Technology

[0002] For companies specializing in livestock and poultry manure treatment, in actual operation, they often simultaneously collect mixed waste containing a large amount of kitchen waste. This type of kitchen waste mostly comes from catering companies, family kitchens, and food processing, and has a complex composition and is rich in salt (mainly sodium chloride). If it is directly mixed with livestock and poultry manure for treatment, it will have multiple negative impacts on subsequent resource utilization and the stability of the treatment process. Therefore, the desalination pretreatment of kitchen waste has become a key bottleneck restricting the efficient treatment of mixed waste. Currently, the industry's pretreatment methods for kitchen waste mainly focus on basic steps such as solid-liquid separation and volume reduction. Commonly used technologies include mechanical extrusion dehydration and crushing and sorting. However, there are still significant shortcomings in specialized treatment solutions for the core need of "salt reduction," specifically the following issues: Firstly, traditional mechanical extrusion can only separate free water, failing to remove salts from the organic matter or those bound to fats and proteins, resulting in high-salt solids. When such high-salt solids are used for composting, a salt content exceeding 1.5% will inhibit the reproduction of microorganisms such as actinomycetes, prolonging the composting cycle and reducing fertilizer efficiency; when used for biogas fermentation, it will kill methanogenic bacteria, reducing gas production efficiency by more than 30%, and even causing system failure. Some companies use large amounts of clean water to rinse and dilute the salt, but this generates massive amounts of high-salt wastewater, which not only increases the burden on wastewater treatment but also wastes water resources, violating the goal of "water conservation and emission reduction." Secondly, kitchen waste contains 20%-35% grease, and existing equipment lacks an efficient oil-water separation mechanism, easily forming emulsions during solid-liquid separation or rinsing. Grease adhering to the surface of solid materials hinders salt dissolution, reducing the desalination effect; unseparated oil-water mixtures discharged into the wastewater system cause grease buildup and blockages in pipes, consume dissolved oxygen in the biological treatment unit, leading to decreased aeration efficiency in the aerobic tank and sludge floating in the anaerobic section. Direct discharge of oily wastewater also pollutes water bodies, forming an oil film that hinders reoxygenation and damages the ecosystem. Third, existing pretreatment methods rely on manual control of rinsing water volume, judgment of oil-water separation timing, and transfer of solid materials. This is labor-intensive, inefficient, and prone to fluctuations in treatment results due to human error. For example, improper manual temperature control can cause oil to solidify due to excessively low water temperature, affecting salt removal; imbalanced water volume control can lead to incomplete rinsing or excessive wastewater. Oil-water separation relies on manual observation of the separation interface, making it difficult to monitor oil levels in real time. This can easily result in oil being lost with wastewater or oil being carried into the drainage, reducing resource recovery efficiency and process stability. Fourth, existing production lines for livestock and poultry manure treatment companies are designed based on the characteristics of manure. When additional desalination equipment is introduced, problems such as poor compatibility, large footprint, and the need for large-scale production line modifications are often encountered. Some desalination equipment can only process kitchen waste alone, requiring additional transfer devices to connect to the manure system, increasing investment costs and extending the processing time. At the same time, the equipment lacks design for the "high organic matter, high oil, and high salt" characteristics of kitchen waste, making it prone to malfunctions such as filter plate clogging and material lifting mechanism jamming, resulting in high maintenance costs and difficulty in meeting the needs of continuous production. Summary of the Invention The technical problem to be solved by the present invention is to provide a desalination treatment system and method for kitchen waste, which aims to solve the technical problems of low salt removal efficiency and waste of resources, difficulty in separating oil and water layers that easily leads to secondary pollution, low degree of process automation resulting in cumbersome and unstable operation, low equipment integration and poor compatibility with the existing production lines of livestock and poultry manure treatment enterprises in the current pretreatment of kitchen waste.

[0003] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a kitchen waste desalination treatment system, including a filter press chamber, a material lifting chamber on one side of the filter press chamber, an inclined screen plate in the middle of the filter press chamber that extends into the material lifting chamber, a material lifting mechanism in the material lifting chamber, and the input end of the material lifting mechanism located below the lower end of the inclined screen plate. The output end of the lifting mechanism passes through the washing chamber on one side of the lifting bin. The top of the washing chamber is equipped with a spray pipe, and the bottom of the spray pipe is equipped with a downward spray nozzle. The washing chamber below the output end of the lifting mechanism is equipped with a receiving mesh plate. The bottom of the washing chamber is connected to a circulation pipe, and a circulation pump is installed on the circulation pipe. The circulation pipe is connected to the spray pipe. The washing chamber is provided with an oil-water buffer tank and a solid material tank on one side. The solid material tank is located above the oil-water buffer tank. An overflow hole is provided on the side wall of the washing chamber below the receiving mesh plate. The overflow hole is connected to the oil-water buffer tank. One end of the receiving mesh plate extends into the solid material tank.

[0004] In a preferred embodiment, the filter press chamber is equipped with a cross-shaped rotating filter plate, and the top of the washing chamber is equipped with a filter press pusher cylinder. The pusher rod of the filter press pusher cylinder is horizontally set and its end is equipped with a filter press plate. The filter press plate extends and retracts horizontally to filter the solid material on the cross-shaped rotating filter plate.

[0005] In a preferred embodiment, a motor compartment is also provided on one side of the filter press chamber, and a drive motor is provided in the motor compartment. The drive shaft of the drive motor is connected to the rotating shaft where the cross-shaped rotating filter plate is located.

[0006] In a preferred embodiment, a ratchet is provided on the rotating shaft inside the motor compartment, and a pawl is provided on the side wall of the motor compartment. The ratchet and the pawl cooperate to realize the unidirectional rotation of the rotating shaft.

[0007] In a preferred embodiment, a capacitive oil level sensor is provided inside the oil-water buffer tank; The bottom of the oil-water buffer tank is equipped with a drain pipe and an oil drain pipe, and the drain pipe and the oil drain pipe are respectively equipped with an electrically controlled drain valve and an electrically controlled oil drain valve.

[0008] In a preferred embodiment, the bottom of the filter press chamber and the washing chamber is also equipped with a drain pipe with an electrically controlled drain valve, and multiple drain pipes are connected to the same main pipe.

[0009] In a preferred embodiment, a water supply pipe is provided at the top of the washing chamber.

[0010] In a preferred embodiment, one end of the receiving mesh plate is hinged to a hinge seat provided on the inner wall of the washing chamber, and the other end is supported by a push cylinder of the receiving mesh plate provided in the solid material bin. The push rod of the receiving mesh plate pusher is set vertically upward. The bottom surface of the receiving mesh plate part located in the solid material bin is provided with a sliding groove, and a slider is provided in the sliding groove. The end of the push rod of the receiving mesh plate pusher is hinged to the slider.

[0011] In a preferred embodiment, the bottom surface of the solid material bin on one side of the receiving mesh plate pusher is provided with a vertical plate for supporting the end of the receiving mesh plate.

[0012] The method for desalinizing kitchen waste based on the above-mentioned kitchen waste desalination system is characterized by the following steps: S1. Kitchen waste is poured into the cross-shaped rotating filter plate above the filter press chamber by the garbage truck; S2. The drive motor drives the cross-shaped rotating filter plate to rotate 90°, so that the kitchen waste is transferred to one side of the filter press cylinder; S3. The filter press cylinder extends and drives the filter press plate to filter the kitchen waste. The water in the kitchen waste is squeezed out and falls to the bottom of the filter press chamber. S4. The drive motor continues to drive the cross-shaped rotating filter plate to rotate 90°. The kitchen waste that has been initially filtered falls onto the inclined screen plate and slides along the inclined screen plate into the lifting mechanism. S5. The lifting mechanism lifts the kitchen waste and feeds it into the receiving mesh plate of the washing chamber. The circulation pump runs and sprays the pre-stored washing hot water in the washing chamber onto the kitchen waste through the spray pipe. S6. After being washed with hot water spray, the oil in the kitchen waste is carried to the bottom of the washing tank and forms an oil-water separation. The upper layer of oil overflows into the oil-water buffer tank through the overflow hole. S7. The receiving screen retracts, causing the receiving screen to tilt. After the kitchen waste is sprayed and cleaned, it falls into the solid waste bin along the tilted receiving screen. The capacitive oil level sensor monitors the oil-water separation interface in the oil-water buffer tank and discharges the lower layer of cleaning water by opening and closing the electrically controlled drain valve and the upper layer of oil by opening and closing the electrically controlled oil drain valve. The electrically controlled drain valve at the bottom of the filter press chamber in the system opens and discharges the wastewater generated after the filter press is completed; The electrically controlled drain valve at the bottom of the washing chamber opens and discharges warm water after the water temperature drops below 55°C, while hot water at a temperature of not less than 80°C is added to the washing chamber through the water supply pipe.

[0013] The kitchen waste desalination system and method provided by this invention, by adopting the above-described structure, have the following beneficial effects: (1) Through the combined process of "cross-rotating filter plate pressure filtration + hot water circulation spray", more than 80% of the free water and some dissolved salt in the kitchen waste are first removed by pressure filtration, and then hot water above 80℃ is used for circulation spray. Hot water can promote the melting of oil and remove it from the surface of solid material, and accelerate the dissolution of salt inside organic matter, so that the salt content of solid material is reduced to less than 1%, which fully meets the microbial activity requirements of subsequent composting and biogas fermentation, and avoids the problem of functional microbial inhibition. (2) Through the collaborative design of water washing tank overflow and oil-water buffer tank monitoring, the oil-water mixture collected at the bottom of the water washing tank will naturally separate into layers after standing. The upper layer of oil will flow into the oil-water buffer tank through the overflow hole, avoiding the transfer of emulsion with solid material or wastewater. The capacitive oil level sensor monitors the oil-water interface in real time. Combined with the automatic control of the electric drain valve and the oil drain pipe, oil recovery can be realized and the oil content of the drainage can be reduced, effectively preventing the problem of oil clogging the pipe and interfering with the biochemical treatment. (3) Through the full-process electronic control design, the automatic operation from garbage feeding, filter pressing, material lifting, spraying to solid material discharge and oil-water separation is realized without manual transfer or adjustment; the circulating pump and water supply pipe are linked to control the cleaning water temperature, avoiding the problem of grease solidification caused by improper manual temperature control. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a top view of the filter press chamber structure of the present invention.

[0016] Figure 3 This is a schematic diagram of the ratchet and pawl structure of the present invention.

[0017] Figure 4 This is a schematic diagram of the receiving mesh plate structure of the present invention.

[0018] In the diagram: 1. Filter press chamber; 2. Feeding chamber; 3. Washing chamber; 4. Circulating pump chamber; 5. Cross-shaped rotating filter plate; 6. Rotary shaft; 7. Inclined screen plate; 8. Feeding mechanism; 9. Filter press push cylinder; 10. Filter press plate; 11. Spray pipe; 111. Spray head; 12. Circulating pipe; 13. Circulating pump; 14. Receiving screen plate; 15. Overflow hole; 16. Oil-water buffer tank; 17. Water supply pipe; 18. Drain pipe; 19. Electrically controlled drain valve; 20. Oil drain pipe; 21. Electrically controlled oil drain valve; 22. Capacitive oil level sensor; 23. Solid material bin; 24. Motor bin; 25. Drive motor; 26. Ratchet; 27. Pawl; 28. Hinge seat; 29. ​​Receiving screen plate push cylinder; 30. Slide chute; 31. Slider; 32. Vertical plate. Detailed Implementation

[0019] Example 1: A kitchen waste desalination system includes a filter press chamber 1, a material lifting chamber 2 on one side of the filter press chamber 1, an inclined screen plate 7 extending into the material lifting chamber 2 in the middle of the filter press chamber 1, a material lifting mechanism 8 in the material lifting chamber 2, and the input end of the material lifting mechanism 8 located below the lower end of the inclined screen plate 7. The output end of the lifting mechanism 8 passes through the washing chamber 3 on one side of the lifting chamber 2. The top of the washing chamber 3 is equipped with a spray pipe 11, and the bottom of the spray pipe 11 is equipped with a downward spray nozzle 111. The washing chamber 3 below the output end of the lifting mechanism 8 is equipped with a receiving mesh plate 14. The bottom of the washing chamber 3 is connected to a circulation pipe 12, and a circulation pump 13 is provided on the circulation pipe 12. The circulation pipe 12 is connected to the spray pipe 11. The washing chamber 3 is provided with an oil-water buffer tank 16 and a solid material bin 23 on one side. The solid material bin 23 is located above the oil-water buffer tank 16. An overflow hole 15 is provided on the side wall of the washing chamber 3 below the receiving mesh plate 14. The overflow hole 15 is connected to the oil-water buffer tank 16. One end of the receiving mesh plate 14 passes through the solid material bin 23.

[0020] In a preferred embodiment, the filter press chamber 1 is provided with a cross-shaped rotating filter plate 5, and the top of the washing chamber 3 is provided with a filter press push cylinder 9. The push rod of the filter press push cylinder 9 is horizontally set and its end is provided with a filter press plate 10. The filter press plate 10 extends and retracts horizontally to filter the solid material on the cross-shaped rotating filter plate 5.

[0021] In a preferred embodiment, a motor compartment 24 is also provided on one side of the filter press chamber 1. A drive motor 25 is provided inside the motor compartment 24, and the drive shaft of the drive motor 25 is connected to the rotating shaft 6 where the cross-shaped rotating filter plate 5 is located.

[0022] In a preferred embodiment, a ratchet 26 is provided on the rotating shaft 6 inside the motor compartment 24, and a pawl 27 is provided on the side wall of the motor compartment 24. The ratchet 26 and the pawl 27 cooperate to realize the unidirectional rotation of the rotating shaft 6.

[0023] In a preferred embodiment, a capacitive oil level sensor 22 is provided inside the oil-water buffer tank 16; The bottom of the oil-water buffer tank 16 is provided with a drain pipe 18 and an oil drain pipe 20, and the drain pipe 18 and the oil drain pipe 20 are respectively provided with an electrically controlled drain valve 19 and an electrically controlled oil drain valve 21.

[0024] In a preferred embodiment, the bottom of the filter press chamber 1 and the washing chamber 3 are also provided with drain pipes 18 equipped with electrically controlled drain valves 19, and multiple drain pipes 18 are connected to the same main pipe.

[0025] In a preferred embodiment, a water supply pipe 17 is provided on the top of the water washing chamber 3.

[0026] In a preferred embodiment, one end of the receiving mesh plate 14 is hinged to the hinge seat 28 provided on the inner wall of the washing chamber 3, and the other end is supported by the receiving mesh plate push cylinder 29 provided in the solid material chamber 23. The push rod of the receiving mesh plate push cylinder 29 is set vertically upward. The bottom surface of the receiving mesh plate 14 located in the solid material bin 23 is provided with a sliding groove 30, and a slider 31 is provided in the sliding groove 30. The end of the push rod of the receiving mesh plate push cylinder 29 is hinged to the slider 31.

[0027] In a preferred embodiment, a vertical plate 32 for supporting the end of the receiving mesh plate 14 is provided on the bottom surface of the solid material bin 23 on one side of the receiving mesh plate pusher 29.

[0028] Example 2: A method for treating kitchen waste desalination based on the kitchen waste desalination system described in Example 1 includes the following steps: S1. Kitchen waste is poured into the cross-shaped rotating filter plate 5 above the filter press chamber 1 by the garbage truck; S2. Drive motor 25 drives cross-shaped rotating filter plate 5 to rotate 90°, so that kitchen waste is transferred to one side of filter press cylinder 9; S3. The filter press cylinder 9 extends and drives the filter press plate 10 to filter the kitchen waste. The water in the kitchen waste is squeezed out and falls to the bottom of the filter press chamber 1. S4. Drive motor 25 continues to drive cross-rotating filter plate 5 to rotate 90°. The kitchen waste after preliminary pressing and filtration falls onto inclined mesh plate 7 and slides along inclined mesh plate 7 into lifting mechanism 8. S5, the lifting mechanism 8 lifts the kitchen waste and feeds it into the receiving mesh plate 14 of the washing chamber 3. The circulating pump 13 runs and sprays the pre-stored washing hot water in the washing chamber 3 onto the kitchen waste through the spray pipe 11. S6. After being washed by hot water spray, the oil in the kitchen waste is carried to the bottom of the water washing tank 3 and forms an oil-water separation. The upper layer of oil overflows into the oil-water buffer tank 16 through the overflow hole 15. S7. The retraction action of the receiving screen pusher 29 causes the receiving screen 14 to tilt, and the kitchen waste after spray cleaning falls into the solid material bin 23 along the tilted receiving screen 14. The capacitive oil level sensor 22 monitors the oil-water separation interface in the oil-water buffer tank 16, and discharges the lower layer cleaning water by opening and closing the electrically controlled drain valve 19 and discharges the upper layer oil by opening and closing the electrically controlled oil drain valve 21. The electrically controlled drain valve 19 at the bottom of the filter press chamber 1 in the system opens and discharges the wastewater generated after the filter press after the entire operation is completed. The electrically controlled drain valve 19 at the bottom of the washing chamber 3 opens and discharges warm water after the water temperature drops below 55°C, while hot water at a temperature of not less than 80°C is added to the washing chamber 3 through the water supply pipe 17.

[0029] Combined with appendix Figure 1-4 The specific processing method includes the following steps: 1. Pretreatment preparation Open the water supply pipe to inject hot water at a temperature of 85℃ into the water washing chamber until the water level reaches 2 / 3 of the volume of the water washing chamber 3, then close the water supply pipe 17; start the circulation pump 13, check whether the water output from the spray nozzles of the spray pipe 11 is uniform, and after ensuring that there are no leaks in the circulation system, stop the circulation pump 13 and keep it on standby; open the electrically controlled drain valve 19 and the electrically controlled oil drain valve 21 of the oil-water buffer tank 16 to drain the residual liquid in the tank and then close the valves.

[0030] 2. Kitchen waste pressure filtration separation 2.1 The garbage truck pours kitchen waste into the cross-shaped rotating filter plate above the filter press chamber at a uniform speed. The drive motor 25 in the motor chamber 24 is started. The motor drives the rotating shaft to rotate through the belt drive. Under the one-way limiting action of the ratchet 26 and the pawl 17, the cross-shaped rotating filter plate rotates precisely 90° clockwise, transferring the kitchen waste to one side of the filter press push cylinder 9. The motor 25 then stops running.

[0031] 2.2 Start the filter press cylinder 9. The push rod extends and drives the filter press plate 10 to apply pressure to the kitchen waste on the cross-shaped rotating filter plate 5, maintaining a pressure of 0.8 MPa for 3 minutes. During the pressing process, the free water and some dissolved salt in the kitchen waste drip through the filter holes to the bottom of the filter press chamber 1, forming filter press wastewater, which is temporarily stored at the bottom of the filter press chamber 1. 2.3 After the filter press is completed, the push rod of the filter press cylinder 9 is retracted, the drive motor 25 is started again, and the cross-shaped rotating filter plate continues to rotate 90°. The kitchen waste after preliminary filter press falls onto the inclined screen plate 7 due to gravity and slides along the inclined screen plate 7 into the lifting mechanism 8.

[0032] 3. Hot water circulation spray to reduce salt content 3.1 Start the lifting mechanism 8. The lifting mechanism 8 lifts the kitchen waste after preliminary pressing and filtration to the top of the washing chamber 3 and spreads the waste on the receiving mesh plate 14. The lifting mechanism 8 continues to run until all the kitchen waste is transferred to the receiving mesh plate 14.

[0033] 3.2 Restart the circulation pump 13. The 85°C hot water in the washing chamber is transported to the spray pipe 11 through the circulation pipe. It is then sprayed in a mist form onto the kitchen waste on the receiving mesh plate 11 through the nozzle 111 for 12 minutes. During the spraying process, the hot water dissolves the salt in the kitchen waste and melts the grease. The mixture of salt water and grease drips through the mesh of the receiving mesh plate 14 to the bottom of the washing chamber 3, forming an oil-water mixture.

[0034] 4. Oil-water separation and solids collection 4.1 After the spraying is completed, turn off the circulation pump 13 and let the oil-water mixture in the water washing chamber stand for 15 minutes. The oil and water will naturally separate into layers based on the density difference between the oil and water, with the upper layer being oil and the lower layer being washing water.

[0035] 4.2 After settling, the upper layer of oil at the bottom of the water washing tank 3 slowly overflows into the oil-water buffer tank 16 through the overflow hole 15 on the side wall. When the oil level in the oil-water buffer tank 16 reaches the set value, the capacitive oil level sensor 22 detects the oil-water separation interface and sends a signal to the control system in real time.

[0036] 4.3 After receiving the signal, the control system first opens the electrically controlled drain valve 19 to discharge a small amount of water from the lower layer. When the oil level sensor 22 detects that the water layer has disappeared, the electrically controlled drain valve 19 is closed, the electrically controlled oil drain valve 21 is opened, the oil in the tank is discharged into a special oil tank for recovery, and the electrically controlled oil drain valve is closed.

[0037] 4.4. Activate the receiving screen pusher cylinder. The pusher rod retracts, and the receiving screen 14 rotates around the hinge seat 28, forming a 15° tilt angle. The kitchen waste on the receiving screen 14, after being sprayed and cleaned, slides along the tilted surface into the solid material bin 23, completing the solid material collection. The pusher cylinder pusher rod then extends, returning the receiving screen to a horizontal position, and the pusher cylinder is closed.

[0038] 5. Wastewater treatment and system reset 5.1 Open the electrically controlled drain valve 19 at the bottom of filter press chamber 1 to discharge the filter press wastewater into the main wastewater treatment pipe of the plant area; open the electrically controlled drain valve 19 at the bottom of washing chamber 3 to discharge the washing water in the washing chamber into the main wastewater treatment pipe as well. After both chambers are emptied, close the valves. 5.2 Repeat the above steps to continue processing the remaining kitchen waste of the day.

Claims

1. A kitchen waste desalination system, characterized in that: Includes a filter press chamber (1), a material lifting chamber (2) is provided on one side of the filter press chamber (1), an inclined screen plate (7) is provided in the middle of the filter press chamber (1) and extends into the material lifting chamber (2), and a material lifting mechanism (8) is provided in the material lifting chamber (2), with the input end of the material lifting mechanism (8) located below the lower end of the inclined screen plate (7); The output end of the lifting mechanism (8) passes through the washing chamber (3) on one side of the lifting bin (2). The top of the washing chamber (3) is provided with a spray pipe (11), and the bottom of the spray pipe (11) is provided with a downward-facing nozzle (111). The washing chamber (3) below the output end of the lifting mechanism (8) is provided with a receiving mesh plate (14). The bottom of the washing chamber (3) is connected to a circulation pipe (12), and a circulation pump (13) is provided on the circulation pipe (12). The circulation pipe (12) is connected to the spray pipe (11). The washing tank (3) is provided with an oil-water buffer tank (16) and a solid material tank (23) on one side. The solid material tank (23) is located above the oil-water buffer tank (16). An overflow hole (15) is provided on the side wall of the washing tank (3) below the receiving mesh plate (14). The overflow hole (15) is connected to the oil-water buffer tank (16). One end of the receiving mesh plate (14) passes into the solid material tank (23).

2. The kitchen waste desalination system according to claim 1, characterized in that: The filter press chamber (1) is provided with a cross-shaped rotating filter plate (5), and the top of the washing chamber (3) is provided with a filter press push cylinder (9). The push rod of the filter press push cylinder (9) is set horizontally and its end is provided with a filter press plate (10). The filter press plate (10) extends and retracts horizontally to filter the solid material on the cross-shaped rotating filter plate (5).

3. The kitchen waste desalination system according to claim 2, characterized in that: The filter press chamber (1) is also provided with a motor chamber (24) on one side. The motor chamber (24) is provided with a drive motor (25). The drive shaft of the drive motor (25) is connected to the rotating shaft (6) where the cross-shaped rotating filter plate (5) is located.

4. The kitchen waste desalination system according to claim 3, characterized in that: The motor housing (24) has a ratchet (26) on the shaft (6) and a pawl (27) on the side wall of the motor housing (24). The ratchet (26) and the pawl (27) work together to achieve unidirectional rotation of the shaft (6).

5. The kitchen waste desalination system according to claim 1, characterized in that: The oil-water buffer tank (16) is equipped with a capacitive oil level sensor (22). The bottom of the oil-water buffer tank (16) is provided with a drain pipe (18) and an oil drain pipe (20), and an electrically controlled drain valve (19) and an electrically controlled oil drain valve (21) are respectively provided on the drain pipe (18) and the oil drain pipe (20).

6. The kitchen waste desalination system according to claim 5, characterized in that: The bottom of the filter press chamber (1) and the washing chamber (3) are also equipped with drain pipes (18) with electrically controlled drain valves (19), and multiple drain pipes (18) are connected to the same main pipe.

7. The kitchen waste desalination system according to claim 1, characterized in that: The top of the washing chamber (3) is equipped with a water supply pipe (17).

8. The kitchen waste desalination system according to claim 1, characterized in that: One end of the receiving mesh plate (14) is hinged to the hinge seat (28) provided on the inner wall of the washing chamber (3), and the other end is supported by the receiving mesh plate push cylinder (29) provided in the solid material chamber (23); The push rod of the receiving mesh plate push cylinder (29) is set vertically upward. A groove (30) is provided on the bottom surface of the receiving mesh plate (14) located in the solid material bin (23). A slider (31) is provided in the groove (30). The end of the push rod of the receiving mesh plate push cylinder (29) is hinged to the slider (31).

9. A kitchen waste desalination system according to claim 8, characterized in that: The bottom surface of the solid hopper (23) on one side of the receiving mesh plate pusher (29) is provided with a vertical plate (32) for supporting the end of the receiving mesh plate (14).

10. A method for desalination of kitchen waste according to any one of claims 1-9, characterized in that... Includes the following steps: S1. Kitchen waste is poured from the garbage truck onto the cross-shaped rotating filter plate (5) above the filter press chamber (1); S2. The drive motor (25) drives the cross-shaped rotating filter plate (5) to rotate 90°, so that the kitchen waste is transferred to the side of the filter press cylinder (9); S3. The filter press cylinder (9) extends and drives the filter press plate (10) to filter the kitchen waste. The water in the kitchen waste is squeezed out and falls to the bottom of the filter press chamber (1). S4. The drive motor (25) continues to drive the cross-shaped rotating filter plate (5) to rotate 90°. The kitchen waste after preliminary pressing and filtration falls onto the inclined mesh plate (7) and slides along the inclined mesh plate (7) into the lifting mechanism (8). S5. The lifting mechanism (8) lifts the kitchen waste and feeds it into the receiving mesh plate (14) of the washing chamber (3). The circulating pump (13) runs and sprays the pre-stored washing hot water in the washing chamber (3) onto the kitchen waste through the spray pipe (11). S6. After being washed by hot water spray, the oil in the kitchen waste is carried to the bottom of the washing tank (3) and forms an oil-water stratification. The upper layer of oil overflows into the oil-water buffer tank (16) through the overflow hole (15). S7. The receiving screen push cylinder (29) retracts, causing the receiving screen (14) to tilt. After the kitchen waste is sprayed and cleaned, it falls into the solid material bin (23) along the tilted receiving screen (14). The capacitive oil level sensor (22) monitors the oil-water stratification interface in the oil-water buffer tank (16), and discharges the lower layer cleaning water by opening and closing the electrically controlled drain valve (19) and discharges the upper layer oil by opening and closing the electrically controlled oil drain valve (21). The electrically controlled drain valve (19) at the bottom of the filter press chamber (1) in the system opens and discharges the wastewater generated after the filter press after the entire operation is completed; The electrically controlled drain valve (19) at the bottom of the washing chamber (3) opens and discharges warm water after the water temperature drops below 55°C. At the same time, hot water at a temperature of not less than 80°C is added to the washing chamber (3) through the water supply pipe (17).

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