A centralized treatment system and treatment process for resource utilization of kitchen waste

Abstract

The present invention discloses a centralized treatment system and treatment process for resource utilization of kitchen waste. The treatment system includes a waste conveying system for conveying kitchen waste; a waste pretreatment system for successively performing automatic sorting and crushing, solid-liquid separation, and auxiliary material mixing on the conveyed kitchen waste; a waste oil treatment system for treating the filtrate obtained from the above solid-liquid separation, wherein the filtrate first undergoes preliminary separation by a three-phase separation system, and the crude oil obtained from the preliminary separation is further subdivided by the waste oil treatment system to obtain an aqueous phase and an oil phase; an aerobic composting system, in which the solid waste obtained from the solid-liquid separation and the above-mentioned organic matter are mixed with auxiliary materials and then enter the aerobic composting system for aerobic fermentation to be converted into available fertilizers; the generated aqueous phase and wastewater enter a sewage treatment system, and the oil phase is recycled, thereby realizing the resource utilization of kitchen waste.

Description

Technical Field

[0001] The present invention relates to the resource treatment of catering waste from restaurants, hotels, unit canteens, etc. in solid waste treatment and kitchen waste discarded in daily household life, and particularly relates to a centralized treatment process and system for resource treatment of kitchen waste. Background Art

[0002] At present, the main treatment processes for kitchen waste at home and abroad include landfill, incineration, anaerobic digestion, aerobic composting, direct drying for feed, and microbial treatment technology, etc. Sanitary landfill and incineration disposal mix kitchen waste with domestic waste for disposal, causing serious secondary pollution. The feed-making process cannot avoid the problem of protein homology, and this process is gradually shrinking in the market. The microbial treatment technology has a small single-unit treatment capacity, high equipment energy consumption, and high operating costs, and cannot be applied in projects for centralized resource treatment of kitchen waste. The use of anaerobic digestion treatment technology for kitchen waste has a relatively wide application abroad. Especially in Europe, the treatment of organic waste by anaerobic digestion has developed greatly. In Japan and South Korea, the anaerobic digestion treatment of kitchen waste has also developed greatly. This technology has a high degree of harmlessness, completely overcomes the influence of homology, and has a high organic load-bearing capacity, but there are problems such as difficult treatment of biogas residue and biogas slurry and low degree of resource utilization.

[0003] The more advanced foreign kitchen waste treatment technologies are mainly distributed in European countries. The kitchen waste treatment technologies in South Korea and Japan are also relatively advanced. There are great differences between China's kitchen waste and foreign kitchen waste in terms of composition and sorting degree. Foreign treatment technologies are not suitable for the treatment of China's kitchen waste, and most of the key equipment of foreign technologies has not been domesticated, and the equipment cost is very high. There is no precedent for the successful application of foreign kitchen waste treatment technologies in China.

[0004] In recent years, among the existing kitchen waste treatment technologies, aerobic composting belongs to a mature process. Our company has continuously innovated on the basis of traditional processes and developed a set of processes and systems suitable for centralized resource treatment of China's kitchen waste. Summary of the Invention

[0005] The purpose of the present invention is to provide a centralized treatment system for resource treatment of kitchen waste to solve the above-mentioned defects in the prior art.

[0006] The technical solution of the present invention is as follows:

[0007] A centralized resource treatment system for kitchen waste, comprising a waste conveying system for conveying kitchen waste; a waste pretreatment system for successively performing automatic sorting, crushing, solid-liquid separation, and auxiliary material mixing on the conveyed kitchen waste; a waste oil treatment system for treating the filtrate obtained from the above-mentioned solid-liquid separation, wherein the filtrate first undergoes primary separation by a three-phase separation system, and the crude oil obtained from the primary separation is further subdivided by the waste oil treatment system to obtain an aqueous phase and an oil phase; an aerobic composting system, into which the solid waste obtained from the solid-liquid separation and the above-mentioned organic matter are mixed with auxiliary materials and then enter the aerobic composting system for aerobic fermentation to be converted into utilizable fertilizers, thereby realizing the resource utilization of kitchen waste.

[0008] The present invention does not require multi-stage sorting and crushing treatment, and can directly remove non-processable plastic products, magnetic metal products, etc. in kitchen waste through automatic sorting and crushing, reducing the investment and operating costs of kitchen waste treatment; the solid waste after solid-liquid separation can be directly subjected to aerobic fermentation after being mixed with auxiliary materials. After the waste oil treatment system performs preliminary three-phase separation, it is further subdivided to obtain an aqueous phase, an oil phase, and organic matter. Among them, the oil phase is recycled for waste oil, the organic matter can be mixed with auxiliary materials for fermentation treatment, and the aqueous phase enters the sewage treatment system for treatment, thereby completing the resource treatment of kitchen waste.

[0009] Preferably, the waste pretreatment system includes an automatic sorting and crushing integrated machine device; the kitchen waste is conveyed by the conveying system to a receiving hopper and enters the automatic sorting and crushing integrated machine device. The automatic sorting and crushing integrated machine device is a hammer crusher. The solid organic matter and easily crushable waste in the waste are crushed and discharged by the rotating hammer, mixed with auxiliary materials for aerobic fermentation, and the non-crushable plastic products, fabrics, and magnetic metal products in the kitchen waste are removed, reducing the impact on subsequent pretreatment equipment (solid-liquid separation equipment and auxiliary material mixing equipment) and fermentation equipment. Among them, the light substances and non-easily crushable impurities are not completely crushed and are conveyed to the tail end for discharging and packing for external disposal.

[0010] The water content of kitchen waste is about 85%-90%. Since the suitable water content of the material for aerobic composting is about 50%-55%, it is necessary to separate the water in the kitchen waste as much as possible to reduce the addition amount of auxiliary materials. Preferably, the waste pretreatment system of the present invention further includes a first solid-liquid separation device, and the first solid-liquid separation device is a spiral progressive extruder. Using spiral progressive extrusion separation can control the water content of kitchen organic matter at about 60%, and effectively avoid the disadvantages of "shaft holding", slipping and not feeding of materials, and the ordinary press getting stuck and not discharging slag, and the spiral wearing when encountering hard materials, ensuring the effect and efficiency of pressing.

[0011] Preferably, the aerobic composting system includes a waste distribution device and a fermentation device. The solid waste mixed with auxiliary materials is evenly distributed by the waste distribution device into the fermentation device for aerobic fermentation. A rice husk layer is arranged at the bottom of the fermentation device to ensure water filtration and ventilation. The waste distribution device ensures that the water content and stacking height of the waste fed into the fermentation device are similar, so that all parts in the fermentation device can be fully utilized, and the aerobic fermentation can be carried out better. Arranging a rice husk layer at the bottom of the fermentation device can filter water and also helps with ventilation. Oxygen can smoothly pass through the rice husk layer and enter between the wastes, thereby improving the fermentation production efficiency.

[0012] Among them, a turning device is arranged in the fermentation device, and the materials turned over each time are advanced forward by 2 - 4 m. Generally, the compost is turned over once every 1 - 2 days; a blower and a ventilation system are arranged at the bottom of the fermentation device. The ventilation system includes a blower, ventilation pipes, ventilation ditches and aeration heads. A filtrate drain pipe and ditch are arranged at the front end of the fermentation device. The whole fermentation process is static stacking and static turning, mainly divided into four stages: heating stage, main fermentation stage, post-fermentation stage and maturity stage. The total duration of the compost fermentation is 30 days.

[0013] Preferably, the waste oil treatment system includes a three-phase separation system, a heating and pressure-holding device, a buffer storage device, a second solid-liquid separation device, and an oil-water separation device; the filtrate generated after solid-liquid separation is transported to the three-phase separation system for primary separation. The crude oil obtained from the primary separation is transported into the heating and pressure-holding device for heating and pressure-holding treatment. After a predetermined time, it is discharged to the buffer storage device. Among them, the floating oil on the upper layer enters the oil-water separation device to be separated into an aqueous phase and an oil phase, and the solid matter and water on the lower layer enter the second solid-liquid separation device to be separated into an aqueous phase and organic matter. Since the three-phase separation system is only used for the primary separation of the filtrate, the crude oil obtained contains solid matter and an aqueous phase and is difficult to recycle. Therefore, the present invention optimizes the waste oil treatment system. By setting a heating and pressure-holding device, the crude oil and wastewater are heated and pressure-held, heated to about 85 °C, and maintained for about 120 minutes. Further separation is carried out. The floating oil on the upper layer is skimmed off, and then the floating oil on the upper layer is treated by the oil-water separation device, and the solid matter and water on the lower layer are treated by the second solid-liquid separation device, so as to further separate the aqueous phase, oil phase and organic matter.

[0014] A resource treatment process for kitchen waste, using the treatment system described in any of the above, specifically including the steps: S1 The kitchen waste is first pretreated, including automatically sorting, crushing, solid-liquid separation of the kitchen waste, and mixing auxiliary materials with the solid waste after solid-liquid separation; S2 The filtrate obtained from solid-liquid separation is initially subjected to three-phase separation by the waste oil treatment system to obtain organic matter, crude oil, and wastewater. Among them, the crude oil is further subdivided into an oil phase, a water phase, and organic matter. The organic matter is mixed with auxiliary materials and then undergoes aerobic fermentation. The wastewater and the water phase enter the sewage treatment system for sewage treatment, and the oil phase is recovered and treated; S3 The solid waste after mixing with auxiliary materials is subjected to aerobic composting fermentation to prepare an organic substrate.

[0015] Preferably, step S2 further includes: heating the crude oil to 75 - 90 °C for pressure-holding treatment, depressurizing and standing after pressure-holding for about 100 - 140 min. Among them, the upper floating oil is subjected to oil-water separation, the lower solid matter and water are subjected to solid-liquid separation, and the liquid phase obtained from solid-liquid separation is subjected to oil-water separation, so as to further separate and obtain a water phase, an oil phase, and organic matter.

[0016] Preferably, in step S3, first, a layer of rice husks is filled at the bottom of the fermentation device for aerobic composting for water filtration and ventilation, and then the solid waste mixed with auxiliary materials is stacked on the layer of rice husks.

[0017] Preferably, the stacking height of the solid waste mixed with auxiliary materials is 2 - 3 m.

[0018] Preferably, during the aerobic composting fermentation process, the materials are regularly turned and tossed. Each time the turned and tossed materials are advanced 2 - 4 m forward, the compost is turned once every 1 - 2 days, and the total duration of composting fermentation is 20 - 30 days.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] First, the kitchen waste of the present invention is pretreated by the pretreatment system to complete the automatic sorting, crushing, solid-liquid separation, and mixing of auxiliary materials of the waste, without the need for multi-stage sorting and crushing treatment; an automatic sorting and crushing integrated device can directly and automatically sort and crush to remove non-processable plastic products, magnetic metal products, etc. in the kitchen waste, reducing the investment and operating costs of kitchen waste treatment; the solid waste after solid-liquid separation is mixed with auxiliary materials and then enters the aerobic composting system for aerobic fermentation, and the separated filtrate enters the waste oil treatment system and is initially separated by a three-phase separation system, and then further subdivided to obtain a water phase, an oil phase, and organic matter, thus completing the resource centralized treatment of kitchen waste.

[0021] Second, the kitchen waste of the present invention enters the fermentation device through the waste distribution device, ensuring that the moisture content and stacking height of the waste fed into the fermentation device are similar, so that all parts of the fermentation device are fully utilized, and aerobic fermentation can proceed better; a rice husk layer is arranged at the bottom of the fermentation device of the present invention, which can filter water and also helps ventilation. Oxygen can smoothly pass through the rice husk layer and enter between the wastes, thereby improving the fermentation production efficiency; the present invention adopts the method of improving the ventilation method and composting height, effectively improving the composting efficiency, without secondary fermentation, and only one fermentation is required to convert the organic matter in the kitchen waste into a fertilizer that can be resourcefully utilized.

[0022] Third, the solid-liquid separation technology of the kitchen waste of the present invention adopts spiral progressive extrusion separation, effectively avoiding the disadvantages of materials "sticking to the shaft", slipping and not feeding, the ordinary press getting stuck and not discharging slag, and the spiral wearing when encountering hard materials, ensuring the pressing effect and efficiency.

[0023] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. Brief Description of the Drawings

[0024] Figure 1 is a schematic diagram of the centralized treatment system for resource utilization of kitchen waste in Embodiment 1 of the present invention;

[0025] Figure 2 is a schematic diagram of the treatment process in Embodiment 2 of the present invention. Detailed Embodiments

[0026] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the protection scope of the present invention. In actual applications, the improvements and adjustments made by those skilled in the art according to the present invention still fall within the protection scope of the present invention.

[0027] Embodiment 1

[0028] This embodiment provides a centralized treatment system for resource utilization of kitchen waste. Referring to Figure 1 as shown, the treatment system includes: a waste pretreatment system 1, a waste oil treatment system 2, an aerobic composting system 3, and a conveying system 4 for respectively conveying kitchen waste to the waste pretreatment system 1, the waste oil treatment system 2, and the aerobic composting system 3.

[0029] The garbage pretreatment system 1 includes an automatic sorting and crushing integrated machine device 10, a first solid-liquid separation device 11, and an auxiliary material mixing device 12. The centralized collection of kitchen waste is sent into the automatic sorting and crushing integrated machine device 10 through the conveying system 4. The main function of the automatic sorting and crushing integrated machine device 10 is to remove and transport the non-processable plastic products, magnetic metal products, etc. in the kitchen waste, reducing the impact on the subsequent pretreatment equipment and fermentation equipment. The organic wet material after automatic sorting and crushing enters the first solid-liquid separation device 11 through the conveying system 4 for solid-liquid separation. The dehydrated solid waste is transported into the aerobic composting system 3 to prepare organic matrix after mixing with auxiliary materials in the auxiliary material mixing device 12.

[0030] The characteristics of kitchen waste are complex in composition and contain impurities such as non-degradable plastics, fabrics, and metals, which seriously affect the subsequent resource utilization system. In the market, a multi-stage sorting system or a decomposition and separation system is mainly used for the pretreatment of kitchen waste. The multi-stage sorting system has disadvantages such as high investment and operating costs, and the decomposition and separation system slurries the kitchen waste, affecting the subsequent composting fermentation. The automatic sorting and crushing integrated machine device 10 in this embodiment is an automatic sorter, which adopts a special rotating hammer design. The solid organic matters (such as food, bones, wood, bamboo, etc.) and easily broken heavy substances (such as shells, glass, porcelain chips, etc.) in the waste are broken by the special rotating hammer in the automatic sorter and discharged into the auxiliary material mixing device 12 to mix with the auxiliary materials, while the light substances (such as plastics, fabrics, etc.) and impurities such as metals that are not easily broken are not completely crushed due to the special design of the rotating hammer and are transported to the tail end for discharge. The discharged plastics, fabrics, metals and other sundries are packed and transported out for disposal.

[0031] The moisture content of kitchen waste is about 85%-90%. Since the suitable moisture content of the material for aerobic composting is about 50%-55%, it is necessary to separate the moisture in the kitchen waste as much as possible to reduce the addition amount of auxiliary materials. The first solid-liquid separation device 11 in this embodiment adopts a spiral step-by-step extruder, and uses spiral step-by-step extrusion separation to carry out solid-liquid separation on the kitchen waste, successfully controlling the moisture content of the separated kitchen organic matter at about 60%, and effectively avoiding the drawbacks of the material "sticking to the shaft", slipping and not feeding, and the ordinary press getting stuck and not discharging slag, and the spiral wearing when encountering hard materials, ensuring the pressing effect and efficiency.

[0032] In this embodiment, the waste grease treatment system 2 includes a three-phase separation system 20, a heating and pressure maintaining device 21, a buffer storage device 22, a second solid-liquid separation device 23, and an oil-water separation device 24. The filtrate generated after the first solid-liquid separation device 11 dehydrates the kitchen waste is transported to the three-phase separation system 20 by the conveying system 4. The organic matter generated by the three-phase separation is returned to the auxiliary material mixing device 12. The wastewater generated by the three-phase separation enters the sewage treatment system for treatment. The crude grease generated by the three-phase separation is transported by the conveying system 4 and reaches the heating and pressure maintaining device 21 through two-stage comprehensive discharge troughs. In the heating and pressure maintaining device 21, it is heated to about 85°C and maintained for 120 minutes, then depressurized and discharged to the buffer storage device 22. After standing and stratifying, the upper floating oil is skimmed out. The upper floating oil directly enters the oil-water separation device 24 for oil-water separation, and the water phase and oil phase are separated. The lower solids and water are pumped to the second solid-liquid separation device 23 for solid-liquid separation. Among them, the organic matter separated by solid-liquid separation is subjected to aerobic composting treatment, and the liquid phase separated by solid-liquid separation enters the oil-water separation device 24 for oil-water separation, so as to further separate the water phase, oil phase and organic matter. The oil phase is recycled, the water phase enters the sewage treatment system for treatment, and the organic matter is returned to the auxiliary material mixing device 12 to be mixed with auxiliary materials for aerobic fermentation. Considering that it is difficult for the three-phase separation system 20 to finely separate the three phases, this embodiment optimizes the waste grease treatment system 2. By arranging a further subdivision device behind the three-phase separation system 20, the crude grease obtained by the three-phase separation is further subdivided, so as to realize the resource treatment of the filtrate.

[0033] In this embodiment, the aerobic composting system 3 includes a waste distribution device 30 and a fermentation device 31. The solid waste and organic matter mixed with auxiliary materials enter the fermentation device 31 through the waste distribution device 30. The bottom of the fermentation device 31 is filled with rice husks to form a rice husk layer. The kitchen waste enters the fermentation device 31 through the waste distribution device 30 (such as a waste distributor), ensuring that the moisture content and stacking height of the waste fed into the fermentation device 31 are similar, so that all parts in the fermentation device 31 can be fully utilized, and the aerobic fermentation can be carried out better. Arranging a rice husk layer at the bottom of the fermentation device 31 can filter water and also helps ventilation. Oxygen can smoothly pass through the rice husk layer and enter between the wastes, thereby improving the fermentation production efficiency.

[0034] Among them, the fermentation device 31 is a fermentation tank with a whole-tank ventilation system. The ventilation system includes a fan, ventilation pipes, ventilation ditches and aeration heads. The ventilation system ensures the uniform distribution of oxygen in the tank during the fermentation process. A filtrate drain pipe and ditch are arranged at the front end of the bottom of the tank for discharging the leachate generated during the fermentation process. It also includes a discharging system.

[0035] Furthermore, the fermentation device 31 is equipped with a turning device, such as a track-type turning machine. The materials turned each time are advanced forward by 2 - 4 m, and the compost is generally turned once every 1 - 2 days. The entire fermentation process at the bottom of the trough is static stacking and static turning, which is mainly divided into four stages: the temperature-rising stage, the main fermentation stage, the post-fermentation stage, and the maturity stage. The total duration of the compost fermentation is 30 days.

[0036] Aerobic composting is generally divided into two-stage fermentation processes: the main fermentation and the post-fermentation. Obviously, for compost without post-fermentation, the organic matter in food waste has not been well harmlessly and resourcefully disposed, and its use value is relatively low. By using highly efficient fermenting bacteria, laying a rice husk layer at the bottom of the trough to improve ventilation conditions and the compost height, the present invention improves the fermentation efficiency, and only needs one fermentation to convert the organic matter in food waste into a resource-utilizable fertilizer, thereby reducing the fermentation cost and the floor area of the fermentation system.

[0037] In this embodiment, the three-phase separation system 20 is a three-phase separator, the heating and pressure-holding device 21 is a heating reaction kettle, the buffer storage device 22 is a buffer storage tank, the second solid-liquid separation device 23 is a vertical screw centrifuge, and the oil-water separation device 24 is a horizontal centrifuge. Among them, the heating and pressure-holding device 21 is heated by steam at 1 MPa. The conveying system 4 includes a conveyor belt for conveying solid waste and a delivery pump for conveying fluids such as filtrate.

[0038] Embodiment 2

[0039] This embodiment provides a process for resource treatment of food waste, which is processed by using the centralized food waste resource treatment system described in Embodiment 1. Refer to Figure 2 , and the treatment process includes:

[0040] S1 The food waste is first pretreated by the garbage pretreatment system 1, including automatic sorting, crushing, solid-liquid separation of the food waste, and mixing of auxiliary materials for the solid waste after solid-liquid separation.

[0041] S2 The filtrate obtained from solid-liquid separation is subjected to preliminary three-phase separation by the waste oil treatment system 2 to obtain organic matter, crude oil, and wastewater. Among them, the crude oil is further subdivided into an oil phase, a water phase, and organic matter. The organic matter is mixed with auxiliary materials and then subjected to aerobic fermentation. The wastewater and the water phase enter the sewage treatment system for sewage treatment, and the oil phase is recovered and treated.

[0042] S3 The solid waste after mixing with auxiliary materials is subjected to aerobic composting fermentation to prepare an organic substrate.

[0043] Among them, in step S1, an automatic sorting and crushing integrated machine device 10, a first solid-liquid separation device 11, and an auxiliary material mixing device 12 are successively used for automatic sorting and crushing, solid-liquid separation, and auxiliary material mixing. The sorting and crushing in this embodiment can be achieved only through one process, which simplifies the pretreatment process of kitchen waste compared with the existing multi-stage sorting and crushing process.

[0044] In step S2, the crude grease obtained by three-phase separation is further refined. First, it is heated to 85 °C by a heating device for pressure-holding treatment. After pressure-holding for about 120 min, the pressure is released, and the material is discharged to a buffer storage device 22. After standing, among them, the upper floating oil is subjected to oil-water separation, the lower solids and water are subjected to solid-liquid separation, the organic matter separated by solid-liquid separation is subjected to aerobic composting treatment, and the liquid phase separated by solid-liquid separation is subjected to oil-water separation treatment, so as to further separate and obtain an aqueous phase, an oil phase, and organic matter.

[0045] In step S3, first, a rice husk layer is filled at the bottom of the fermentation device for aerobic composting for water filtration and ventilation, and then the solid waste mixed with auxiliary materials is stacked on the rice husk layer.

[0046] Among them, the stacking height of the solid waste mixed with auxiliary materials is 2-3 m. During the aerobic composting fermentation process, the materials are regularly turned and tossed. Each time the turned and tossed materials are advanced 2-4 m forward, and the compost is turned once every 1-2 days. The total duration of composting fermentation is 20-30 days.

[0047] This embodiment improves the treatment process of waste grease in kitchen waste and realizes the resource utilization of waste grease in kitchen waste. Setting a rice husk layer at the bottom of the aerobic tank can filter water and also helps with ventilation. Oxygen can smoothly pass through the rice husk layer and enter between the garbage, thereby improving the fermentation production efficiency. By using highly efficient fermentation bacteria, improving the ventilation method, and the composting height, the composting efficiency is effectively improved. There is no need for secondary fermentation, and only one fermentation is required to convert the organic matter in kitchen waste into a fertilizer that can be resource-utilized.

[0048] The above-disclosed is only the preferred embodiment of the present invention. The preferred embodiment does not elaborate on all details, nor does it limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can make good use of the present invention. The present invention is only limited by the claims and their full scope and equivalents.

[0049] Various modifications to these embodiments will be apparent to those of ordinary skill in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A centralized treatment system for resource utilization of kitchen waste, characterized in that, Including: A garbage conveying system for conveying kitchen waste; A garbage pretreatment system for successively performing automatic sorting, crushing, solid-liquid separation, and auxiliary material mixing on the conveyed kitchen waste; wherein, the automatic sorting and crushing means crushing and discharging the solid organic matter and easily crushable garbage in the garbage, and removing the non-crushable plastic products, fabrics, and magnetic metal products in the garbage; A waste oil treatment system for treating the filtrate obtained from the above solid-liquid separation. Wherein, the filtrate first undergoes primary separation by a three-phase separation system to obtain organic matter, crude oil, and wastewater. The crude oil obtained from the primary separation is further subdivided by the waste oil treatment system into an aqueous phase, an oil phase, and organic matter after passing through two-stage comprehensive discharge tanks; the crude oil is heated to 75-90°C for pressure-holding treatment, and after pressure-holding for 100-140 minutes, the pressure is released and it is allowed to stand; An aerobic composting system. The solid garbage obtained from the solid-liquid separation, as well as the organic matter obtained from the above primary separation and the organic matter obtained from the subdivision, are mixed with auxiliary materials and then enter the aerobic composting system for aerobic fermentation to be converted into utilizable fertilizers, thereby realizing the resource utilization of kitchen waste.

2. The centralized treatment system for resource utilization of kitchen waste according to claim 1, characterized in that, The garbage pretreatment system includes an automatic sorting and crushing integrated machine device; the automatic sorting and crushing integrated machine device is a hammer crusher, and the solid organic matter and easily crushable garbage in the garbage are crushed and discharged by a rotating hammer, and the non-crushable plastic products, fabrics, and magnetic metal products in the garbage are removed.

3. The centralized treatment system for resource utilization of kitchen waste according to claim 1, characterized in that, The garbage pretreatment system further includes a first solid-liquid separation device, and the first solid-liquid separation device is a spiral progressive extruder.

4. The centralized treatment system for resource utilization of kitchen waste according to claim 1, characterized in that, The aerobic composting system includes a garbage distribution device and a fermentation device. The solid garbage mixed with auxiliary materials is evenly distributed by the garbage distribution device into the fermentation device for aerobic fermentation, and a rice husk layer is arranged at the bottom of the fermentation device to ensure ventilation.

5. The centralized treatment system for resource utilization of kitchen waste according to claim 1, characterized in that, The waste oil treatment system includes a three-phase separation system, a heating and pressure-holding device, a buffer storage device, a second solid-liquid separation device, and an oil-water separation device; the filtrate generated after solid-liquid separation is conveyed to the three-phase separation system for primary separation, and the crude oil obtained from the primary separation is conveyed to the heating and pressure-holding device for heating and pressure-holding treatment, and after a predetermined time, it is discharged to the buffer storage device. Among them, the upper floating oil enters the oil-water separation device to be separated into an aqueous phase and an oil phase, and the lower solids and water enter the second solid-liquid separation device to be separated into an aqueous phase and organic matter.

6. A treatment process for resource utilization of kitchen waste, characterized in that, Using the treatment system as described in any one of claims 1-5, specifically including the steps: S1 The kitchen waste is first pretreated, including automatically sorting, crushing, and performing solid-liquid separation on the kitchen waste, and mixing auxiliary materials with the solid garbage after solid-liquid separation; wherein, the automatic sorting and crushing means crushing and discharging the solid organic matter and easily crushable garbage in the garbage, and removing the non-crushable plastic products, fabrics, and magnetic metal products in the garbage; The filtrate obtained from the solid-liquid separation in S2 is subjected to preliminary three-phase separation by the waste grease treatment system to obtain organic matter, crude grease, and wastewater. Among them, the crude grease is further subdivided into an oil phase, a water phase, and organic matter after passing through two stages of the comprehensive discharge tank. The organic matter obtained from the above-mentioned preliminary three-phase separation and the organic matter obtained from the further subdivision are mixed with auxiliary materials and then subjected to aerobic fermentation. The wastewater and the water phase enter the sewage treatment system for sewage treatment, and the oil phase is recovered and processed; the crude grease is heated to 75-90 °C for pressure-holding treatment, and after pressure-holding for 100-140 minutes, the pressure is released and it is left to stand; The solid waste after mixing with auxiliary materials in S3 is subjected to aerobic composting fermentation to prepare an organic substrate.

7. The treatment process for resource utilization of kitchen waste according to claim 6, characterized in that, The step S2 further includes: separating the oil floating on the upper layer into oil and water, separating the solid matter on the lower layer from water by solid-liquid separation, and separating the liquid phase obtained from the solid-liquid separation into oil and water, so as to further separate and obtain a water phase, an oil phase, and organic matter.

8. The treatment process for resource utilization of kitchen waste according to claim 6, characterized in that, In step S3, first, a rice husk layer is filled at the bottom of the fermentation device for aerobic composting for water filtration and ventilation, and then the solid waste mixed with auxiliary materials is stacked on the rice husk layer.

9. The treatment process for resource utilization of kitchen waste according to claim 6, characterized in that, The stacking height of the solid waste mixed with auxiliary materials is 2-3 m.

10. The treatment process for resource utilization of kitchen waste according to claim 6, characterized in that, During the aerobic composting fermentation process, the materials are regularly turned and tossed. Each time the materials are turned and tossed, they are advanced 2-4 m forward, and the compost is turned once every 1-2 days. The total duration of the composting fermentation is 20-30 days.

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