Kitchen waste separation treatment and resource utilization method and system

Abstract

The invention discloses a kitchen waste separation treatment and resource utilization method and system. The method comprises the steps that organic matter and inorganic matter in kitchen waste slurry are separated; separating the inorganic substances such as sandy substances, plastics and bones of the shellfish through a microbubble flotation machine; shellfish sand is dried through a rotational flow dryer, the dried shellfish sand enters a rotational flow modifier, a catalyst is added for modification, and the heavy metal adsorbent is prepared; separating the organic matters into a solid phase and a liquid phase; water in the liquid-phase organic matter is removed, and the dehydrated pure liquid-phase organic matter is conveyed into a hydrogen storage tank to be used for storing hydrogen; purifying the solid phase, and separating a filter material mixed in the solid phase to obtain a solid-phase organic matter; the solid-phase organic matter is pyrolyzed to obtain hydrogen and activated carbon, and the hydrogen is stored in a hydrogen storage tank. The method realizes efficient separation and utilization of inorganic matters and organic matters in the kitchen waste, is not limited to anaerobic digestion and utilization of the kitchen waste, and improves the recycling efficiency of the inorganic matters and the organic matters to the maximum extent.

Description

Technical Field

[0001] The present invention relates to the field of restaurant and kitchen waste treatment, and in particular to a restaurant and kitchen waste separation and resource utilization method and a system based on the method. Background Art

[0002] my country's rapid urbanization and significant improvements in living standards have led to a dramatic increase in the generation of food waste. Food waste primarily refers to waste generated from daily life, as well as from food processing, catering services, and workplace catering. Due to regional variations in dietary habits, the composition of domestic food waste varies significantly. Coastal areas typically contain large amounts of shellfish, while central and western regions contain high amounts of oil and fat. When collection and transportation regulations are inadequate, food waste often contains large amounts of inorganic impurities such as plastic and chopsticks. Consequently, my country's food waste is characterized by "four mores and one more"—high volume, high water content, high oil content, high salt content, and a complex composition. Currently, anaerobic digestion is the most widely used process. The main process involves sorting food waste to remove large impurities, then finely pulping the waste to create a slurry while separating light materials and other non-breakable impurities. A desander removes sand particles from the organic slurry. After three-phase oil extraction, the waste is then sent to an anaerobic tank for anaerobic treatment. This process has many problems in engineering applications, such as the limited disposal of inorganic impurities separated by pretreatment, which primarily relies on incineration; low separation efficiency of organic and inorganic matter, resulting in high organic matter loss; low anaerobic fermentation biogas yield, and poor system stability. Therefore, the present invention designs a process for separating, treating, and recycling food waste.

[0003] To address the complex composition of food waste, CN111744936A discloses a novel food waste treatment process. This process utilizes a feeding system to feed food waste into a heating device, which then heats the food waste. The heated food waste is then fed into a crushing and sorting system via an automatic feeding system. Large inorganic waste chunks are separated and discharged from the system. The waste is then crushed using a crusher to produce dry waste and fine organic matter. The fine organic matter is then filtered, dehydrated, sorted, and squeezed to produce a liquid phase and organic matter, which are then processed separately. This method of sorting first, then crushing, can easily damage the blades in the food waste during crushing, increasing maintenance costs. Furthermore, the inorganic matter in the food waste is not effectively separated and utilized.

[0004] CN105925361B proposes a pretreatment method for anaerobic digestion of food waste. The method involves removing large materials and pouring the food waste into a hopper for coarse crushing and extrusion, which is then conveyed to a sorting machine. The leachate is then conveyed to a water tank via a leachate collection box. Inorganic debris is then sorted out, and the food waste is hammered, crushed, and pulped, then stirred and heated for solid-liquid separation. The solid residue is conveyed to an organic matter recovery tank. The organic slurry is removed from the waste by a first cyclone desander and then conveyed to a three-phase centrifuge for oil extraction. The oil phase is then conveyed to an oil extractor for purification. The remaining organic slurry enters a solid-liquid mixing tank. The solid residue in the organic matter recovery tank is mixed with the effluent from the anaerobic fermentation system to form a slurry. The slurry is then hydraulically scrubbed for solid-liquid separation. The separated liquid is removed from the waste by a second cyclone desander and conveyed to a solid-liquid mixing tank for impurities. This method does not effectively separate and utilize inorganic matter, and only anaerobic digests the organic matter, resulting in low utilization efficiency, high energy consumption, and a large floor space.

[0005] CN105602600A discloses an energy-saving system for pyrolysis and oil production from food waste. It primarily consists of a pretreatment system, a pyrolysis reaction system, a waste heat utilization system, and a purification and recovery system. The food waste feedstock is first fed into the pretreatment system, where it undergoes bag breaking, centrifugal sedimentation, pulverization, magnetic separation, and drying to produce a solid particle reactant. The feedstock then enters the pyrolysis reaction system, where it undergoes pyrolysis in a pyrolysis reactor. The resulting oil and gas are partially condensed to produce fuel oil. The non-condensable combustible gas and pyrolysis coke are fed into a fluidized bed combustion furnace for combustion. The high-temperature flue gas from the combustion furnace is passed through a waste heat boiler to generate steam for heating users. The purification and recovery system collects the oil-water mixture produced during the pretreatment and pyrolysis reaction stages, extracts the fuel oil, and performs environmentally friendly treatment on the emissions. This system involves complex procedures, requires complex equipment, consumes high energy for the heating equipment, and does not separate and recycle the inorganic matter in the food waste.

[0006] CN116900033A discloses a system and method for deoiling all food waste. The system includes a steam heating system, a centrifugal separation system, a conveying screw, and a cooling circulation system. The steam heating system includes a boiler, a first heating tank, and a second heating tank. The first and second heating tanks are connected to the boiler via a steam pipe, and the first heating tank is connected to a first slurry tank. This system requires numerous devices, occupies a large area, and is difficult to manage.

[0007] This invention aims to provide a method and apparatus for separating, processing, and recycling food waste. This innovative approach utilizes a microbubble flotation device, a cyclone dryer, an ebullient bed separator, and a cyclone separator, all of which are separate and separate devices. Currently, this process is rarely used or reported. This method overcomes the shortcomings of existing technologies, achieving efficient separation and utilization of inorganic and organic matter in food waste. This method is not limited to anaerobic digestion of food waste, but rather maximizes the recovery and utilization efficiency of both inorganic and organic matter. Summary of the Invention

[0008] The problem to be solved by the present invention is to provide a method and process device for separating and recycling food waste, so as to overcome the defects of the prior art.

[0009] To solve the above problems, the present invention adopts the following solution: a method for separating and processing kitchen waste and recycling it, characterized by comprising the following steps: Step 1: The food waste is crushed and pulped to obtain food waste slurry; the food waste slurry is then separated into organic slurry and inorganic matter by a cyclone desander. The organic slurry is discharged from the overflow port at the top of the cyclone, and the inorganic matter is discharged from the bottom flow port. Step 2: Inorganic matter is floated using a microbubble flotation device to separate shellfish sand, plastic, fiber, large bones and other inorganic matter according to density; Step 3: The flotated shellfish sand is dehydrated and dried using a cyclone dryer. The dried shellfish sand is sent to a cyclone modifier and modified by adding a salt solution catalyst to obtain a heavy metal adsorbent. Step 4: Separating the organic slurry discharged from the overflow port in step 1 into solid and liquid phases through an ebullient bed separator; Step 5: The liquid phase separated in step 4 is passed through a cyclone separator to remove internal moisture to obtain pure liquid organic matter, which is then added to a hydrogen storage tank. The hydrogen generated in subsequent processes is absorbed and stored by utilizing the reversible hydrogenation and dehydrogenation reactions between the liquid organic matter and hydrogen. Step 6: The solid phase separated in step 4 is separated from the mixed filter material by a cyclone separator and purified to obtain solid organic matter. The separated filter material can be processed and then re-entered into the fluidized bed for reuse; Step 7: The solid organic matter purified in step 6 is dried in a cyclone dryer to remove moisture, and then enters a cyclone pyrolyzer to crack into pyrolysis gas and biochar. The pyrolysis gas is separated, purified, and purified to produce hydrogen and carbon-containing gas, and the hydrogen is passed into a hydrogen storage tank for storage.

[0010] Furthermore, the method for separating, treating, and recycling food waste is characterized in that the food waste slurry in step 1 has a particle size of ≤10 mm and a total solids (TS) of 14%-20%. The food waste slurry, which has undergone crushing and pulping pretreatment and has a particle size of ≤10 mm and a TS of 14%-20%, is passed through a cyclone desander to separate organic and inorganic matter. The organic slurry is discharged from the overflow port at the top of the cyclone, and the inorganic matter is discharged from the underflow port.

[0011] Furthermore, the method for separating, treating and utilizing kitchen waste as a resource is characterized in that the salt solution catalyst for modifying shellfish sand in step 3 is a silicate solution.

[0012] Furthermore, the method for separating, treating and resource-utilizing kitchen waste is characterized in that nitrogen is introduced into the cyclone pyrolyzer during pyrolysis in step 7 to maintain an inert environment.

[0013] In the method of the present invention, the inlet flow rate of the cyclone desander in step 1 is 18 t / h-20 t / h, and the split ratio is 10%-13%. The feed pressure of the microbubble flotation device in step 2 is 0.16-0.20 MPa, and the bubble diameter is 0.2-2 mm. In step 3, the inlet pressure of the cyclone dryer is a slight positive pressure of 1200 Pa-1400 Pa, the feed flow rate is 20-25 m / s, and 100°C hot air is introduced from the bottom with an air volume of 60 m³ / h and a wind speed of 20-25 m / s. In step 3, the inlet pressure of the cyclone modifier is a slight positive pressure of 1200 Pa-1400 Pa, the feed flow rate is 18-20 m / s, and the catalyst is a 1 mg / L silicate solution. In step 4, the bed filler of the ebullated bed separator is quartz sand with a particle size of 2-3 mm, a penetration time of 4-8 hours, and a separation accuracy of 1 mm. In step 7, the pyrolysis temperature in the cyclone pyrolyzer is 700° C., the pyrolysis time is 1.5 h-2 h, and nitrogen is constantly passed through to maintain an inert environment.

[0014] A system for separating and processing kitchen waste and utilizing it as a resource based on a method for separating and processing kitchen waste and utilizing it as a resource, characterized by comprising: The garbage crusher and pulper are used to crush and pulp the kitchen waste in step 1; The cyclone desander is used in step 1 to separate inorganic matter from the kitchen waste slurry to obtain inorganic matter and organic slurry; The microbubble flotation device is used in step 2 to separate shellfish sand, plastic, bones and other inorganic matter from the inorganic matter; by pressurizing the feed, a high-speed fluid jet is formed, which shears the surrounding air and generates negative pressure, allowing air from the atmosphere to directly enter the material and be sheared into microbubbles, which contact and adsorb with the surface of the inorganic matter, causing the inorganic matter to float to the liquid surface and separate.

[0015] The cyclone dryer is used to remove moisture from the material in steps 3 and 7. The material is carried by the hot air introduced from the bottom and spirally rises with the airflow at high speed. During the spiral rise, the material continuously collides and rubs against each other and the chamber walls, the surface is constantly renewed, the contact area with the hot air is continuously increased, and the heat and mass transfer process is accelerated. In addition, the hot air can drive the material particles to spin to produce centrifugal dehydration, accelerating the material drying speed. The cyclone modifier is used in step 3 to fully mix the shellfish sand with the salt solution catalyst for physical and chemical modification to produce a heavy metal adsorbent; The ebullient bed separator is used in step 4 to separate the solid and liquid phases of the organic slurry; The cyclone separator is used in step 5 to remove water from the liquid phase to obtain pure liquid organic matter, and is used in step 6 to separate the mixed filter material in the solid phase to obtain solid organic matter and filter material. After treatment, the filter material is re-entered into the fluidized bed for reuse; The cyclone pyrolyzer is used in step 7 to pyrolyze the dried solid organic matter to obtain hydrogen and activated carbon; The hydrogen storage tank is used to store the pure liquid organic matter obtained in step 5 and the hydrogen obtained in step 7.

[0016] Furthermore, the device for separating, processing and recycling kitchen waste based on the method for separating, processing and recycling kitchen waste is characterized in that it also includes an incineration tower for incinerating inorganic impurities generated by the microbubble flotation device.

[0017] Furthermore, the device for separating and processing food waste and utilizing it as a resource based on the method is characterized in that the cyclone dryer, cyclone modifier, and cyclone separator are connected by a pipe to a fan, with the airflow generated by the fan serving as a carrier gas for transporting the cyclone-separated material. In the cyclone dryer, hot air introduced from the bottom carries the material upward in a high-speed spiral along with the airflow. During this spiral ascent, the material continuously collides and rubs against each other and the chamber walls, constantly renewing its surface and increasing its contact area with the hot air, accelerating heat and mass transfer. Furthermore, the hot air drives the material particles to spin, generating centrifugal dehydration and accelerating material drying. After the internal temperature of the cyclone modifier rises to 400-450°C, the internal forces of the cyclone field are used to fully mix the shellfish sand with the salt solution catalyst under high-temperature conditions, undergoing physical and chemical modification to produce a heavy metal adsorbent.

[0018] Furthermore, the device for separating, processing and utilizing kitchen waste based on the method for separating, processing and utilizing kitchen waste is characterized in that it also includes a material transfer device for transferring materials between a garbage crusher, a pulper, a cyclone desander, a microbubble flotation device, a cyclone dryer, a cyclone modifier, a fluidized bed separator, a cyclone separator, a cyclone pyrolyzer and a hydrogen storage tank.

[0019] The cyclone desander is preferably made of stainless steel with a wall thickness of 10mm. The lower end adopts a multi-cone structure with 2-4 cone sections to improve the separation efficiency of inorganic and organic matter. The cyclone modifier preferably has a wall thickness of 15mm. A heating module is installed inside the wall, and the heating temperature can reach up to 450°C. There is a catalyst injection port on the top. After the shell sand contacts the catalyst, the temperature is increased to promote the change of the physical and chemical properties of the shell sand surface. The self-rotating pyrolyzer in the cyclone pyrolyzer is made of quartz with a wall thickness of 5mm. The inlet is connected to the feed pipe with a sealing flange, the overflow pipe is connected to the hydrogen storage tank inlet with a sealing flange, and the underflow pipe is connected to the bottom hopper with a sealing flange.

[0020] The technical effects of the present invention are as follows: (1) The present invention couples various types of separation equipment such as cyclone separators, microbubble flotation devices and fluidized bed separation devices, thereby compensating for the problem of insufficient separation efficiency of organic and inorganic matter in food waste slurry by existing low-speed spiral screening and centrifugal separation methods, and reducing the loss rate of organic matter. The separation efficiency of the cyclone desander for organic and inorganic matter is ≥98%; the high-energy turbulence in the microbubble flotation device strengthens the binding force of bubbles, enhances the diffusion and distribution of air in water, and improves its process performance. Compared with traditional food waste slurry separation devices, the microbubble flotation device has a large processing capacity, high sorting accuracy, and diversified process flow. It can select coarse selection, fine selection, etc. according to the material state, and is more convenient to operate; the separation efficiency of the fluidized bed separator is ≥95%, the equipment can operate continuously, and has strong adaptability to the volatility of the material.

[0021] (2) The cyclone modifier used in the present invention utilizes the high-speed self-rotation motion (rotation rate of up to 20,000 r / min to 60,000 r / min) of inorganic matter in the vortex flow field to obtain a continuous, stable and controllable centrifugal force field. The high-speed shear force and rapidly updated phase interface of the inorganic matter in the cyclone field strengthen the relative speed and mutual contact between the solid inorganic matter and the salt solution catalyst, thereby achieving efficient mass transfer, heat transfer and chemical reaction processes, and effectively improving the catalytic reaction conversion rate. The heavy metal adsorbent prepared after modification has a wide range of uses, realizing the diversified utilization of inorganic matter. Compared with the traditional salt soaking and calcination modification method, the modification time is significantly shortened and the operation is also simpler.

[0022] (3) The present invention adopts cyclonic drying and pyrolysis, utilizing the self-revolution-suspension recirculation coupled motion of organic matter in the cyclonic field to promote the real-time renewal of the organic matter mass transfer and heat transfer surface, and increases its residence time in the reactor through the suspension of organic matter. After cyclonic drying, the water content of shellfish sand is less than 8%, the water content of liquid organic matter is less than 10%, and the water content of solid organic matter is less than 8%. Compared with common fixed-bed reactors and fluidized-bed reactors, the cyclonic pyrolyzer changes the flow mode of gas within the device from traditional longitudinal direct flow to cyclonic flow, making the flow field and temperature field distribution within the pyrolyzer more uniform, greatly improving the overall performance of the pyrolysis system and achieving sufficient and efficient pyrolysis of organic matter. In addition, the cyclonic dryer and cyclonic pyrolyzer are compact in structure and occupy a small area.

[0023] (4) The present invention uses an ebullating bed separator and a cyclone separator to obtain pure liquid organic matter, which is then added to a hydrogen storage tank. A cyclone pyrolyzer is used to pyrolyze the dried solid organic matter to produce hydrogen and activated carbon. The reversible hydrogenation and dehydrogenation reactions between the liquid organic matter and hydrogen are then used to absorb and store the hydrogen produced in subsequent processes. This method achieves efficient separation and utilization of inorganic and organic matter in food waste, not limited to anaerobic digestion of food waste, but maximizing the recycling efficiency of inorganic and organic matter, thereby utilizing food waste as a resource. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the process flow chart of the kitchen waste separation, treatment and resource utilization system.

[0025] Among them, 1: crusher; 2: pulping machine; 3: cyclone desander; 4: microbubble flotation device; 5: incineration tower; 6: fan; 7: cyclone dryer; 8: cyclone modifier; 9: fluidized bed separator; 10: fan; 11: cyclone separator; 12: cyclone dryer; 13: cyclone pyrolyzer; 14: hydrogen storage tank. DETAILED DESCRIPTION

[0026] After extensive and in-depth research, the inventors of this application found that the existing food waste pretreatment process is limited to separating organic matter from inorganic matter, and processing the organic matter for final anaerobic digestion, while the inorganic matter is only simply landfilled or incinerated. The resource utilization rate of the inorganic matter is low, and the utilization method of the organic matter is also relatively simple.

[0027] Based on the above findings, the present invention has developed a method and process device for separating and recycling food waste, which has the advantages of high efficiency, innovation, environmental protection, and low energy consumption, and effectively solves the problems existing in the prior art. Example

[0028] The method of the present invention is used to separate and process kitchen waste and recycle it into resources. The processing process is as follows: Figure 1 shown.

[0029] 1. Key equipment The key equipment in this process flow is a cyclone desander, microbubble flotation cell, cyclone dryer, cyclone pyrolyzer, modifier, fluidized bed separator, and cyclone pyrolyzer. During the experiments, the equipment had a processing capacity of 20 kg / h. In practice, different numbers of devices can be connected in series or the diameter of the cyclone device can be increased depending on the processing capacity. In this example, only one set of kitchen waste treatment and resource recovery devices was used for separate experiments.

[0030] A system for separating and processing food waste and utilizing it as a resource, based on a method for separating and processing food waste and utilizing it as a resource, comprises a garbage crusher, a pulper, a cyclone desander, a microbubble flotation device, a cyclone dryer, a cyclone modifier, a fluidized bed separator, a cyclone separator, a cyclone pyrolyzer, and a hydrogen storage tank. Materials are transferred via conveyor belts and pipes.

[0031] Among them, the cyclone desander is made of stainless steel with a wall thickness of 10mm. The lower end adopts a multi-cone structure with 2-4 cone sections to improve the separation efficiency of inorganic and organic matter.

[0032] The wall thickness of the cyclone modifier is 15mm, and a heating module is installed inside the wall. The heating temperature can reach up to 450℃. There is a catalyst addition port on the top. After the shellfish sand comes into contact with the catalyst, the physical and chemical properties of the shellfish sand surface are promoted to change by increasing the temperature.

[0033] The autorotating pyrolyzer in the cyclone pyrolyzer is made of quartz with a wall thickness of 5mm. The inlet is connected to the feed pipe with a sealing flange, the overflow pipe is connected to the inlet of the hydrogen storage tank with a sealing flange, and the underflow pipe is connected to the bottom hopper with a sealing flange.

[0034] 2. Process parameters This embodiment provides a method for processing and recycling food waste based on a specific embodiment, which effectively processes and reuses food waste. The method includes the following steps: Step 1: Receive food waste, use a crusher to preliminarily crush larger materials, and crush the materials into materials less than 60mm. Then send the crushed materials to the pulper to mix with water. Under the action of the blade and the resistance of the rotating shaft, they are crushed into food waste slurry with uniform particle size, diameter of about 6mm, and TS of 12%. The slurry is sent to the cyclone desander for desanding. The inlet flow rate of the cyclone desander is set to 18t / h and the diversion ratio is 10% to separate the organic slurry and inorganic matter in the food waste.

[0035] Step 2: Inorganic material discharged from the underflow of the cyclone desander is pressurized at 0.16 MPa and fed into a microbubble flotation separator for sorting. The microbubble flotation separator has a volume of 24 m³. A bubble generator produces bubbles with a diameter of 0.5 mm to separate shellfish sand, plastic, and other inorganic material. Other inorganic material is directly landfilled. Shellfish sand and other materials are pressurized at 1200 Pa and flowed into the cyclone at a flow rate of 20 m / s for drying. 100°C hot air is introduced from the bottom of the dryer at a volume of 60 m³ / h and a speed of 20 m / s. After drying, the material is pressurized at 1300 Pa and flowed into the cyclone modifier at a flow rate of 18 m / s. Simultaneously, a 1 mg / L silicate solution is added through the top inlet of the modifier. The cyclone modifier modifies the inorganic material into a heavy metal adsorbent. The plastic is directly transported to the incinerator for incineration.

[0036] Step 3: The organic slurry discharged from the overflow port of the cyclone desander passes through the quartz sand filter with a particle size of 2mm inside the fluidized bed separator and undergoes penetration separation for 4 hours to achieve separation of solid organic matter and liquid organic matter. The liquid organic matter enters the cyclone separator with an inlet flow rate of 18t / h and a split ratio of 12%. After the water inside the liquid organic matter is removed, it is sent to the hydrogen storage tank for absorbing and storing the hydrogen generated in the subsequent process. The mixture of solid organic matter and filter material separated by the fluidized bed separator is separated by the cyclone separator to achieve regeneration of the filter material and solid organic matter. After purification, the regenerated filter material returns to the fluidized bed separator for reuse. The purified solid organic matter is pressurized to 1400Pa and enters the cyclone for drying at a flow rate of 25m / s. Hot air at 100℃ is introduced into the bottom of the dryer with an air volume of 60m³ / h and a wind speed of 20m / s for drying. After drying in the cyclone, it enters the cyclone pyrolyzer under the action of carrier gas and is pyrolyzed at 700℃ in a nitrogen atmosphere for 1.5h to produce hydrogen and activated carbon. The generated hydrogen is introduced into the hydrogen storage tank. The liquid organic matter in the hydrogen storage tank undergoes a reversible reaction with the hydrogen to achieve hydrogen absorption and storage.

[0037] 3. Operational results The collected kitchen waste was continuously tested using the kitchen waste separation and resource recovery process. The initial oil content of the material was 4360 mg / L. The particle size of the pulp after pulping was ≤5 mm. The moisture content of the liquid organic matter after drying was less than 10%, the moisture content of the shellfish sand was less than 8%, and the moisture content of the solid organic matter was less than 8%. The separation efficiency of the solid and liquid organic matter could reach 98%. The specific surface area of the sludge activated carbon produced by the cyclone pyrolysis method reached 140.523 m 2 / g. The micropore volume reached 0.041290cm 3 / g, the hydrogen content in the hydrogen-rich gas produced by pyrolysis reaches 60%.

[0038] In this embodiment, the complete set of process equipment has a simple structure and low operating cost. It relies on cyclone equipment to remove sand, dry, pyrolyze, and modify, and uses a fluidized bed separator to separate the solid and liquid phases of organic matter. It can achieve efficient separation and resource utilization of inorganic and organic matter and reduce equipment wear and tear caused by excessive inorganic sand and gravel, thereby minimizing the impact of food waste on the environment.

[0039] The above-listed embodiments are merely preferred embodiments of the present disclosure and are not intended to limit the scope of implementation of the present disclosure. That is, any equivalent changes and modifications made based on the content of the patent application should fall within the technical scope of the present disclosure.

[0040] All documents mentioned in this disclosure are incorporated herein by reference, just as if each document were incorporated herein by reference individually. It should also be understood that after reading the above teachings of this disclosure, those skilled in the art may make various changes or modifications to this disclosure, and that such equivalents also fall within the scope of the claims appended hereto.

Claims

1. A method for separating, treating and recycling kitchen waste, characterized in that: The steps include: Step 1: The food waste is crushed and pulped to obtain food waste slurry; the food waste slurry is then separated by a cyclone desander to obtain organic slurry and inorganic matter. The organic slurry is discharged from the overflow port at the top of the cyclone, and the inorganic matter is discharged from the bottom flow port. Step 2: Inorganic matter is floated using a microbubble flotation device to separate shellfish sand, plastic, fiber, large bones and other inorganic matter according to density; Step 3: The flotated shellfish sand is dehydrated and dried using a cyclone dryer. The dried shellfish sand is sent to a cyclone modifier and modified by adding a salt solution catalyst to obtain a heavy metal adsorbent. Step 4: separating the organic slurry discharged from the overflow port in step 1 into a solid phase and a liquid phase through an ebullient bed separator; Step 5: The liquid phase separated in step 4 is passed through a cyclone separator to remove internal moisture to obtain pure liquid organic matter, which is then added to a hydrogen storage tank. The hydrogen generated in subsequent processes is absorbed and stored by utilizing the reversible hydrogenation and dehydrogenation reactions between the liquid organic matter and hydrogen. Step 6: The solid phase separated in step 4 is separated from the mixed filter material by a cyclone separator and purified to obtain solid organic matter. The separated filter material can be processed and then re-entered into the fluidized bed for reuse; Step 7: The solid organic matter purified in step 6 is dried in a cyclone dryer to remove moisture, and then enters a cyclone pyrolyzer to crack into pyrolysis gas and biochar. The pyrolysis gas is separated, purified, and purified to produce hydrogen and carbon-containing gas, which are then passed into a hydrogen storage tank for storage.

2. The method for separating, treating and recycling kitchen waste according to claim 1, wherein: The material particle size of the food waste slurry in step 1 is ≤10 mm, and the TS (total solids) is 14%-20%.

3. The method for separating, treating and recycling kitchen waste according to claim 1, wherein: The salt solution catalyst for shellfish sand modification in step 3 is a silicate solution.

4. The method for separating, treating and recycling kitchen waste according to claim 1, wherein: During the pyrolysis in step 7, nitrogen is introduced into the cyclone pyrolyzer to maintain an inert environment.

5. A system for separating and processing kitchen waste and recycling it based on the method for separating and processing kitchen waste and recycling it according to claim 1, characterized in that: include: The garbage crusher (1) and the pulping machine (2) are used for crushing and pulping the kitchen waste in step 1; The cyclone desander (3) is used in step 1 to separate the food waste slurry into organic slurry and inorganic matter; The microbubble flotation device (4) is used in step 2 to separate shellfish sand, plastic, bones and other inorganic matter from the inorganic matter; The cyclone dryer is used to remove moisture from the substance in steps 3 and 7; The cyclone modifier (8) is used in step 3 to fully mix the shellfish sand with the salt solution catalyst to perform physical and chemical modification to prepare a heavy metal adsorbent; The ebullient bed separator (9) is used in step 4 to separate the organic slurry into a solid phase and a liquid phase; The cyclone separator (11) is used in step 5 to remove water from the liquid phase to obtain pure liquid organic matter, and is used in step 6 to separate the mixed filter material in the solid phase to obtain solid organic matter and filter material, wherein the filter material is treated and then re-entered into the fluidized bed for reuse; The cyclone pyrolyzer (13) is used in step 7 to pyrolyze the dried solid organic matter to obtain hydrogen and activated carbon; The hydrogen storage tank (14) is used to store the pure liquid organic matter obtained in step 5 and the hydrogen obtained in step 7.

6. The device for separating and processing kitchen waste and recycling it according to claim 5, characterized in that: It also includes an incineration tower (5) for incinerating inorganic impurities generated by the microbubble flotation device.

7. The device for separating and processing kitchen waste and recycling it according to claim 5, wherein: The cyclone dryer, cyclone modifier and cyclone separator are connected by a pipeline to set a fan, and the airflow generated by the fan is used as a carrier gas for transporting substances for cyclone separation.

8. The device for separating and processing kitchen waste and recycling it according to claim 5, wherein: The invention also includes a material transfer device for transferring materials between a garbage crusher (1), a pulping machine (2), a cyclone desander (3), a microbubble flotation device (4), a cyclone dryer, a cyclone modifier (8), a fluidized bed separator (9), a cyclone separator (11), a cyclone pyrolyzer (13) and a hydrogen storage tank (14).

Images