Collaborative pretreatment system for kitchen waste and kitchen garbage and desanding method for homogenate tank

Abstract

The invention provides a kitchen waste and kitchen waste collaborative pretreatment system and a homogenizing tank desanding method. The kitchen waste and kitchen waste collaborative pretreatment system comprises a kitchen waste pretreatment independent module, a kitchen waste pretreatment independent module, a common module and a collaborative module. A sand setting cone and a sand discharging device are respectively arranged at the bottoms of the homogenizing tank, the extrusion dehydration buffer box and the liquid draining box; through reasonable arrangement of the devices and the connection relation, collaborative pretreatment of the kitchen waste and the kitchen garbage is achieved, the pretreatment effect is improved, cooperation between the kitchen waste pretreatment system and the kitchen garbage pretreatment system can be achieved, sand setting and sand discharging devices are arranged, solid particles of downstream pipelines are reduced, and the energy consumption is reduced. The damage of solid hard particles to equipment is reduced, the service life of the whole equipment is prolonged, the blockage of a rear-end pipeline is reduced, the workload is reduced, and the operation and maintenance cost is reduced; and automatic water replenishing of the homogenizing tank, the extrusion dehydration buffer tank and the liquid draining tank can be realized through the water replenishing pipeline.

Description

Technical Field

[0001] This invention relates to waste treatment technology, and more particularly to a co-treatment system for food waste and kitchen waste, and a method for removing sand from a homogenizing tank. Background Technology

[0002] Food waste refers to food scraps and waste cooking oil generated during the production process of relevant enterprises and catering service units such as public canteens, hotels, and restaurants. It mainly originates from commercial establishments such as catering businesses and enterprise / institution canteens.

[0003] Kitchen waste refers to easily perishable organic waste such as fruit and vegetable scraps, leftover food, and fruit peels discarded by residents in their daily lives. It mainly comes from kitchens or restaurants in residents' homes.

[0004] Currently, in addition to landfill and incineration, the treatment of food waste and kitchen waste mainly relies on biochemical treatment for resource utilization. Biochemical treatment primarily consists of two main processes: anaerobic digestion and traditional aerobic composting.

[0005] Compared with traditional aerobic composting, anaerobic digestion has a relatively smaller impact on the environment because it is carried out in a closed environment, and it also has obvious advantages in the utilization of the final product. Therefore, anaerobic digestion is the mainstream approach at present.

[0006] Since anaerobic digestion technology only works on organic matter, and food waste is a mixture of organic matter and non-biodegradable impurities, a food waste pretreatment system is needed to separate organic matter from non-biodegradable materials that affect anaerobic digestion.

[0007] Current waste pretreatment technologies include food waste pretreatment systems and kitchen waste pretreatment systems. Both of these systems contain solid particles such as sand, which cause serious damage to the equipment, as well as problems such as pipe blockage, scaling in heating tanks, and wear and tear on three-phase centrifugal separators. This results in heavy operation and maintenance work, reduced equipment lifespan, high maintenance costs, and shortened service life of each piece of equipment. Summary of the Invention

[0008] To address the problems of existing technologies, this invention proposes a co-processing system for food waste and kitchen waste, along with a sand removal method for a homogenizing tank. This system organically combines a food waste pretreatment system and a kitchen waste pretreatment system. By rationally arranging the equipment and their connections, it achieves co-processing of food waste and kitchen waste, improving the pretreatment effect. Furthermore, it incorporates sand removal by installing sand settling and discharge devices, reducing solid particles in downstream pipelines, mitigating damage to equipment caused by hard solid particles, extending the service life of the conveying pump, and reducing problems such as blockage in downstream pipelines, scaling and clogging in the heating tank, and wear and tear on the centrifuge. This reduces workload, lowers operating and maintenance costs, and effectively solves the technical problems.

[0009] The technical solution adopted by the present invention to solve the technical problem is a co-processing pretreatment system for food waste and kitchen waste, including an independent pretreatment module for food waste, an independent pretreatment module for kitchen waste, a common module and a co-processing module;

[0010] According to the flow direction of the slag and slurry, the independent module for pre-treatment of kitchen waste sequentially includes a kitchen waste unloading hopper, a kitchen waste hopper discharge screw, a kitchen waste material separator, a first kitchen waste separator slag discharge screw, a second kitchen waste separator slag discharge screw, a fine pulping machine slag discharge screw, a fine pulping machine, a slurry screw, and a homogenizing tank. After passing through the kitchen waste material separator, the separated materials sequentially enter the first kitchen waste separator slag discharge screw, the second kitchen waste separator slag discharge screw, and then the fine pulping machine slag discharge screw. After passing through the kitchen waste material separator, the remaining materials enter the fine pulping machine through the fine pulping screw. The slurry produced by the fine pulping machine is then conveyed to the homogenizing tank through the slurry screw. The slag produced by the fine pulping machine is conveyed to the three-phase separation slag collection screw through the fine pulping machine slag discharge screw.

[0011] According to the flow direction of the slag and slurry, the independent pretreatment module for kitchen waste includes, in sequence: a kitchen waste unloading hopper, a kitchen waste hopper discharge screw, a bag-breaking screener, a crusher, a crusher discharge screw, a kitchen waste biological separator, a first-stage kitchen waste slurry screw, a second-stage kitchen waste slurry screw, a dewatering press, a dewatering press buffer tank, and a conveying pump. After passing through the bag-breaking screener, the screened material sequentially enters the crusher, the crusher discharge screw, and the kitchen waste biological separator. The slurry produced by the kitchen waste biological separator is conveyed to the dewatering press via the first-stage and second-stage kitchen waste slurry screws. The slurry produced by the dewatering press enters the dewatering press buffer tank and is then conveyed to the homogenizing tank via a conveying pump from the dewatering press buffer tank. The liquid leaked from the second-stage kitchen waste slurry screw enters the dewatering press buffer tank.

[0012] According to the flow direction of slag and slurry, the common module includes a slurry conveying pump, a hydrocyclone desander, a desander slurry temporary storage tank, a heating tank feed pump, and a sand-water separator; after passing through the slurry conveying pump, the slurry enters the hydrocyclone desander, and after passing through the hydrocyclone desander, the slurry enters the desander slurry temporary storage tank, and then is conveyed to the three-phase separator through pipeline by the heating tank feed pump. After passing through the hydrocyclone desander, the slag enters the sand-water separator, and the sand is conveyed to the three-phase separator while the water is discharged to the desander slurry temporary storage tank;

[0013] The water from the discharge screws of the kitchen waste bin and the waste food bin enters the draining tank respectively.

[0014] According to the flow direction of the slag and slurry, the collaborative module includes a primary screening machine discharge screw; the slag produced by the kitchen waste biological separator enters the fine pulping machine discharge screw, and then enters the extruder three-phase slag collection screw; after passing through the bag-breaking screener, the remaining material enters the primary screening machine discharge screw, then enters the fine pulping machine discharge screw, and then enters the extruder three-phase slag collection screw; the slag produced by the extruder dewatering machine is conveyed to the extruder three-phase slag collection screw via the extruder discharge screw.

[0015] A first settling cone, a second settling cone, and a third settling cone are respectively installed at the bottom of the homogenizing tank, the extrusion dewatering buffer tank, and the draining tank. The first settling cone, the second settling cone, and the third settling cone are respectively equipped with a first sand discharge device, a second sand discharge device, and a third sand discharge device. The homogenizing tank, the extrusion dewatering buffer tank, and the draining tank are respectively equipped with water level sensors.

[0016] Furthermore, the first sand discharge device, the second sand discharge device, and the third sand discharge device all include a drainage pipe and valves, an openable clean filter, and a conveying pump arranged sequentially on the pipe. The inlets of the drainage pipes are respectively connected to the outlets of the first sand settling cone, the second sand settling cone, and the third sand settling cone; the outlets of the drainage pipes are connected to the food waste unloading bin and / or the kitchen waste unloading bin.

[0017] Furthermore, the openable cleanable filter is a basket filter.

[0018] Furthermore, automatic water replenishment pipelines are respectively provided in the homogenizing tank, the extrusion dewatering buffer tank, and the draining tank. The water replenishment pipelines ensure the stability of the internal water level of the homogenizing tank, the extrusion dewatering buffer tank, and the draining tank during sand discharge.

[0019] Furthermore, the automatic water replenishment pipeline is for urban water supply.

[0020] Furthermore, the water source for the automatic water replenishment pipeline comes from three-phase separated wastewater.

[0021] Furthermore, the water source of the automatic water replenishment pipeline comes from the mortar temporary storage tank (V06). One end of the automatic water replenishment pipeline is connected to the mortar temporary storage tank (V06), and the other end of the automatic water replenishment pipeline is connected to the homogenizing tank (V02), the extrusion dewatering buffer tank (V05), and the draining tank (V04).

[0022] In addition, this application also provides a method for removing sand from a homogenizing tank using a co-processing system for kitchen waste and food waste, including a sand removal step. The sand removal step includes: during operation, the sewage pumps of the first sand removal device, the second sand removal device, and the third sand removal device are activated at regular intervals to remove sand and solid particle sediment deposited at the bottom of the homogenizing tank, the extrusion dewatering buffer tank, and the filtrate tank. In this step, the water level sensor transmits the water level signal inside the homogenizing tank, the extrusion dewatering buffer tank, and the filtrate tank to the control system. When the set first water level is reached, the automatic water replenishment pipeline is activated to replenish water. When the set second water level is reached, the automatic water replenishment pipeline is closed. The first water level is lower than the second water level.

[0023] Furthermore, in the sand removal step, the sewage pumps of the first sand removal device, the second sand removal device, and the third sand removal device are started every 2-6 hours, and each operation lasts for 2-10 minutes.

[0024] Furthermore, in the sand removal step, the sand removal of the first sand removal device, the second sand removal device, and the third sand removal device is not carried out at the same time.

[0025] This application organically combines a food waste pretreatment system and a kitchen waste pretreatment system. Through the rational arrangement of various equipment and their connections, it achieves collaborative pretreatment of food waste and kitchen waste, improving the pretreatment effect and enabling synergy between the two systems. In particular, it adds sand removal treatment and automatic water replenishment pipelines, and installs sand settling and discharge devices to reduce solid particles in downstream pipelines, reduce damage to equipment caused by hard solid particles, improve the overall service life of the equipment, reduce back-end pipeline blockage, reduce workload, and lower operation and maintenance costs. The water replenishment pipeline enables automatic water replenishment to the homogenization tank, extrusion dewatering buffer tank, and leaching tank. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a structure of an embodiment of the co-processing pretreatment system for food waste and kitchen waste proposed in this invention;

[0027] Figure 2 This is a schematic diagram of another embodiment of the co-processing pretreatment system for food waste and kitchen waste proposed in this invention;

[0028] Figure 3This is a schematic diagram of another embodiment of the co-processing pretreatment system for food waste and kitchen waste proposed in this invention;

[0029] In the attached diagram, all intersecting lines are disconnected except for those marked with a dot (·), while the intersecting lines marked with a dot (·) represent connected pipes. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0031] In the description of this application, it should be understood that the relationship between the method steps can be sequential or non-sequential, as long as it does not affect the overall technical effect, and therefore should not be construed as a limitation of this application. The following description of this application is merely a description of individual embodiments of the technical solution of this application; other embodiments are not shown in the following description, but this does not mean that this application excludes these other embodiments, nor is the technical solution of this application limited to the specific implementations described below, and the scope of protection of this application is not limited to the specific implementations described below. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0032] It should be noted that if the terms "first," "second," etc., appear in the specification, claims, and accompanying drawings of this application, such descriptions are only used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] In some embodiments, see Figure 1This application provides a co-processing pretreatment system for food waste and kitchen waste, including a separate module for food waste pretreatment, a separate module for kitchen waste pretreatment, a common module, and a co-processing module. A food waste collection vehicle 11 places collected food waste into the separate module for food waste pretreatment, and a kitchen waste collection vehicle 11 places collected kitchen waste into the separate module for kitchen waste pretreatment. It should also be noted that in the waste treatment industry, three-phase separation is a conventional method of separating solid and liquid phases, and separating different liquid phases. The three-phase separation in this application refers to the separation of crude oil, wastewater, and waste residue in conventional waste treatment, and typically includes conventional devices such as a three-phase centrifuge and a heating tank.

[0034] Specifically, according to the flow direction of the slag and slurry, the independent pretreatment module for kitchen waste includes, in sequence, a kitchen waste unloading hopper V01, a kitchen waste material discharge screw L01, a kitchen waste material separator S01, a first kitchen waste separator slag discharge screw L03, a second kitchen waste separator slag discharge screw L04, a fine pulping machine slag discharge screw L06, a fine pulping machine S02, a slurry screw L07, and a homogenizing tank V02. After passing through the kitchen waste material separator S01, the separated materials sequentially enter the first kitchen waste separator slag discharge screw L03 and the second kitchen waste separator... The slag is discharged from the machine via screw L04, and then enters the slag discharge screw L06 of the fine pulping machine; after passing through the kitchen waste sorting machine S01, the remaining material enters the fine pulping machine S02 via screw L05, and the pulp produced by the fine pulping machine S02 is transported to the homogenizing tank V02 via the pulp screw L07; the slag produced by the fine pulping machine S02 is transported to the three-phase separation slag collection screw L16 via the slag discharge screw L06; the three-phase separation slag collection screw L16 finally transports all the slag to the solid slag chamber 13.

[0035] According to the flow direction of the slag and slurry, the independent pretreatment module for kitchen waste includes, in sequence: kitchen waste unloading hopper V03, kitchen waste slurry discharge screw L08, bag-breaking screener S03, crusher S04, crusher discharge screw L10, kitchen waste biological separator S05, first-stage kitchen waste slurry screw L11, second-stage kitchen waste slurry screw L12, extrusion dewatering machine S06, extrusion dewatering buffer tank V05, and conveying pumps P05 / 06; after passing through the bag-breaking screener S03, the screened material sequentially enters the crusher S04, crusher discharge screw L10, and kitchen waste biological separator S05; after passing through the bag-breaking screener S03, the material is fed into the crusher S04, crusher discharge screw L10, and kitchen waste biological separator S05; The slurry produced by the food waste biological separator S05 is conveyed to the extrusion dewatering machine S06 via the first-stage food waste slurry screw L11 and the second-stage food waste slurry screw L12. The slurry produced by the extrusion dewatering machine S06 enters the extrusion dewatering buffer tank V05, and is then conveyed to the homogenizing tank V02 by the conveying pump P05 / 06 of the extrusion dewatering buffer tank V05. The leakage liquid produced by the second-stage food waste slurry screw L12 enters the extrusion dewatering buffer tank V05. This leakage liquid is the liquid portion of the second-stage food waste slurry screw L12 that automatically flows into the water tank below during the screw conveying process and then enters the extrusion dewatering buffer tank V05.

[0036] According to the flow direction of the slag and slurry, the common module includes a slurry conveying pump P01 / 02, a hydrocyclone desander S07 / S08, a desander slurry temporary storage tank V06, a heating tank feed pump P07 / 08, and a sand-water separator S09 / 10. The slurry from the homogenizing tank V02 enters the hydrocyclone desander S07 / S08 after passing through the hydrocyclone desander S07 / S08. After passing through the hydrocyclone desander S07 / S08, the slurry enters the desander slurry temporary storage tank V06, and then is transported to the three-phase separator via pipeline through the heating tank feed pump P07 / 08. After passing through the hydrocyclone desander S07 / S08, the slag enters the sand-water separator. After S09 / 10, the sand is transported to the three-phase separator while the water is discharged to the sand removal liquid storage tank V06. Specifically, after the slurry enters the sand removal slurry storage tank V06, it is transported to the three-phase separator via pipeline through the heating tank feed pump P07 / 08. The three-phase separator then sends the heated slurry to the impurity remover for impurity removal. The separated solid slag is transported to the slag truck by a conveyor for off-site co-processing. The liquid slurry is stored in the impurity removal slurry storage tank and then transported to the three-phase centrifuge for three-phase separation to extract crude oil. The separated solid slag can be used for black soldier fly farming, and the wastewater is reused and then sent to the sewage treatment system for disposal or recycled.

[0037] The water from the kitchen waste bin discharge screw L01 and the waste food bin discharge screw L08 enters the draining tank V04 respectively.

[0038] According to the flow direction of the slag and slurry, the collaborative module includes a primary screening machine discharge screw L09; the slag produced by the kitchen waste biological separator S05 enters the fine pulping machine discharge screw L06, and then enters the extruder three-phase slag collection screw L16; after passing through the bag-breaking screener S03, the remaining material enters the primary screening machine discharge screw L09, then enters the fine pulping machine discharge screw L06, and then enters the extruder three-phase slag collection screw L16; the slag produced by the extruder dewatering machine S06 is conveyed to the extruder three-phase slag collection screw L16 via the extruder discharge screw L13.

[0039] At the bottom of the homogenizing tank V02, the extrusion dewatering buffer tank V05, and the draining tank V04, a first settling cone V021, a second settling cone V051, and a third settling cone V041 are respectively provided. Each of these cones is equipped with a first sand removal device 14, a second sand removal device 16, and a third sand removal device 15. Water level sensors are installed in the homogenizing tank V02, the extrusion dewatering buffer tank V05, and the draining tank V04. During operation, high-density, high-hardness particles from these three tanks will deposit in the settling cones.

[0040] In some embodiments, the first sand discharge device 14, the second sand discharge device 16, and the third sand discharge device 15 each include a drainage pipe and valves, an openable clean filter, and a delivery pump arranged sequentially on the pipe. The inlets of the drainage pipes are respectively connected to the outlets of the first sand settling cone V021, the second sand settling cone V051, and the third sand settling cone V041; the outlets of the drainage pipes are connected to the kitchen waste unloading bin V01 and / or the food waste unloading bin V03; the openable clean filter can be a basket filter. When the sand discharge device is running, high-density, high-hardness particles will be filtered and intercepted in the basket filter, and the filter can be cleaned periodically.

[0041] In some embodiments, automatic water replenishment pipelines are respectively provided in the homogenizing tank V02, the extrusion dewatering buffer tank V05, and the draining tank V04. These pipelines ensure the stability of the internal water level in the homogenizing tank V02, the extrusion dewatering buffer tank V05, and the draining tank V04 during sand discharge. When the first sand discharge device 14, the second sand discharge device 16, and the third sand discharge device 15 are activated, the corresponding water replenishment pipeline pumps are further controlled by the liquid level sensor signals of each tank, starting and then shutting off after a period of operation. This ensures that the liquid level in the homogenizing tank V02, the extrusion dewatering buffer tank V05, and the draining tank V04 remains within the normal range during sand discharge. Figure 1 As shown, the automatic water replenishment pipeline is for urban water supply.

[0042] In some embodiments, such as Figure 2 As shown, the water source for the automatic water replenishment pipeline comes from three-phase separated wastewater. Specifically, three-phase separation is a conventional method in the field for treating the separation of solid and liquid phases, and the separation between different liquid phases. It is generally performed using a three-phase centrifuge, a common method in the waste treatment industry. After the three-phase centrifuge feeds the material, its operation separates the feed into three parts: crude oil, which can be directly sold for economic benefits; wastewater; and waste residue. This wastewater is the three-phase separated wastewater, stored in a three-phase wastewater temporary storage tank. In this embodiment, the three-phase separated wastewater comes from the wastewater stored in the three-phase wastewater temporary storage tank. By utilizing this wastewater for replenishment, wastewater reuse can be achieved, making more rational use of the wastewater generated in waste treatment. The automatic water replenishment pipeline draws water from a three-phase wastewater storage tank. The three-phase separation wastewater in the tank is relatively clean after oil and solid residue have been separated by a three-phase separator. This wastewater is also heated; using it for replenishment allows for partial energy recovery. Furthermore, wastewater that has not yet been completely oil-extracted can be reused for further three-phase separation. This energy recovery and wastewater reuse increases the oil extraction rate, saves energy, and reduces wastewater generation. Moreover, the rinsing water in this application can also utilize this three-phase separation wastewater, achieving even higher oil extraction and wastewater reuse rates.

[0043] In some embodiments, such as Figure 3 As shown, the water source of the automatic water replenishment pipeline comes from the sand removal slurry temporary storage tank V06. One end of the automatic water replenishment pipeline is connected to the sand removal slurry temporary storage tank V06, and the other end of the automatic water replenishment pipeline is connected to the homogenizing tank V02, the extrusion dewatering buffer tank V05, and the draining tank V04.

[0044] In some embodiments, this application also provides a method for removing sand from a homogenizing tank using a co-processing system for food waste and kitchen waste, including a sand removal step. The sand removal step includes: during operation, periodically activating the sewage pumps of the first sand removal device 14, the second sand removal device 16, and the third sand removal device 15 to remove sand and solid particle sediment deposited at the bottom of the homogenizing tank V02, the extrusion dewatering buffer tank V05, and the dewatering tank V04. In this step, a water level sensor monitors the water level inside the homogenizing tank V02, the extrusion dewatering buffer tank V05, and the dewatering tank V04. The signal is transmitted to the control system. When the set first water level is reached, the automatic water replenishment pipeline is activated to replenish water. When the set second water level is reached, the automatic water replenishment pipeline is shut off. The first water level is lower than the second water level. Specifically, in the sand removal step, the sewage pumps of the first sand removal device 14, the second sand removal device 16, and the third sand removal device 15 are started every 2-6 hours, and each operation lasts for 2-10 minutes. In the sand removal step, the sand removal of the first sand removal device 14, the second sand removal device 16, and the third sand removal device 15 is not carried out at the same time.

[0045] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims. The selected and described embodiments are intended to best elucidate the principles of this application and its practical application, thereby enabling other those skilled in the art to best utilize this application with various modifications suitable for the contemplated specific purpose, as well as the various described embodiments.

Claims

1. A co-processing pretreatment system for food waste and kitchen waste, characterized in that, It includes independent modules for pre-treatment of food waste, independent modules for pre-treatment of kitchen waste, common modules, and collaborative modules; According to the flow direction of the slag and slurry, the independent pretreatment module for kitchen waste includes, in sequence, a kitchen waste unloading hopper (V01), a kitchen waste hopper discharge screw (L01), a kitchen waste material separator (S01), a first kitchen waste separator slag discharge screw (L03), a second kitchen waste separator slag discharge screw (L04), a fine pulping machine slag discharge screw (L06), a fine pulping machine (S02), a slurry screw (L07), and a homogenizing tank (V02). After passing through the kitchen waste material separator (S01), the separated materials sequentially enter the first kitchen waste separator slag discharge screw. The material passes through a slurry (L03), a second kitchen waste separator discharge slurry (L04), and then into a fine pulping machine discharge slurry (L06). After passing through the kitchen waste separator (S01), the remaining material passes through a fine pulping machine discharge slurry (L05) and then into a fine pulping machine (S02). The pulp produced by the fine pulping machine (S02) is then conveyed to a homogenizing tank (V02) via a pulping slurry screw (L07). The slag produced by the fine pulping machine (S02) is then conveyed to a three-phase separation slag collection screw (L16) via a fine pulping machine discharge slurry screw (L06). According to the flow direction of the slag and slurry, the independent pretreatment module for kitchen waste includes, in sequence: a kitchen waste unloading hopper (V03), a kitchen waste slurry discharge screw (L08), a bag-breaking screen (S03), a crusher (S04), a crusher discharge screw (L10), a kitchen waste biological separator (S05), a first-stage kitchen waste slurry screw (L11), a second-stage kitchen waste slurry screw (L12), a dewatering press (S06), a dewatering buffer tank (V05), and a conveying pump (P05 / 06); after passing through the bag-breaking screen (S03), the screened material sequentially enters the crusher (S08). 4) Crusher discharge screw (L10), food waste biological separator (S05); the slurry produced by the food waste biological separator (S05) is conveyed to the extrusion dewatering machine (S06) via the first-stage food waste slurry screw (L11) and the second-stage food waste slurry screw (L12). The slurry produced by the extrusion dewatering machine (S06) enters the extrusion dewatering buffer tank (V05), and then is conveyed to the homogenizing tank (V02) by the conveying pump (P05 / 06) of the extrusion dewatering buffer tank (V05); the liquid leaked from the second-stage food waste slurry screw (L12) enters the extrusion dewatering buffer tank (V05). According to the flow direction of the slag and slurry, the common module includes a slurry conveying pump (P01 / 02), a hydrocyclone desander (S07 / S08), a desander slurry temporary storage tank (V06), a heating tank feed pump (P07 / 08), and a sand-water separator (S09 / 10). The slurry from the homogenizing tank (V02) enters the hydrocyclone desander (S07 / S08) after passing through the hydrocyclone desander (S07 / S08). After passing through the hydrocyclone desander (S07 / S08), the slurry enters the desander slurry temporary storage tank (V06), and then is conveyed to the three-phase separator through pipelines via the heating tank feed pump (P07 / 08). After passing through the hydrocyclone desander (S07 / S08), the slag enters the sand-water separator (S09 / 10), where the sand is conveyed to the three-phase separator and the water is discharged to the desander slurry temporary storage tank (V06). The water from the kitchen waste bin discharge screw (L01) and the waste food bin discharge screw (L08) respectively enters the draining tank (V04); According to the flow direction of the slag and slurry, the collaborative module includes a primary screening machine discharge screw (L09); the slag produced by the kitchen waste biological separator (S05) enters the fine pulping machine discharge screw (L06), and then enters the extruder three-phase slag collection screw (L16); after passing through the bag-breaking screen (S03), the remaining material enters the primary screening machine discharge screw (L09) and then enters the fine pulping machine discharge screw (L06), and then enters the extruder three-phase slag collection screw (L16); the slag produced by the extruder dewatering machine (S06) is conveyed to the extruder three-phase slag collection screw L16 via the extruder discharge screw (L13). At the bottom of the homogenizing tank (V02), the extrusion dewatering buffer tank (V05), and the draining tank (V04), a first settling cone (V021), a second settling cone (V051), and a third settling cone (V041) are respectively provided. The first settling cone (V021), the second settling cone (V051), and the third settling cone (V041) are respectively provided with a first sand discharge device (14), a second sand discharge device (16), and a third sand discharge device (15). The homogenizing tank (V02), the extrusion dewatering buffer tank (V05), and the draining tank (V04) are respectively provided with water level sensors.

2. The co-processing pretreatment system for food waste and kitchen waste according to claim 1, characterized in that, The first sand discharge device (14), the second sand discharge device (16), and the third sand discharge device (15) all include a drainage pipe and valves, an openable cleaning filter, and a conveying pump arranged sequentially on the pipe. The inlets of the drainage pipes are respectively connected to the outlets of the first sand settling cone (V021), the second sand settling cone (V051), and the third sand settling cone (V041); the outlets of the drainage pipes are connected to the kitchen waste unloading bin (V01) and / or the food waste unloading bin (V03).

3. The co-processing pretreatment system for food waste and kitchen waste according to claim 2, characterized in that, The openable, cleanable filter is a basket filter.

4. A co-processing pretreatment system for food waste and kitchen waste according to claim 1 or 2, characterized in that, in The homogenizing tank (V02), the extrusion dewatering buffer tank (V05), and the drain tank (V04) are also equipped with automatic water replenishment pipelines, which ensure the stability of the internal water level of the homogenizing tank V02, the extrusion dewatering buffer tank V05, and the drain tank V04 during sand discharge.

5. The co-processing pretreatment system for food waste and kitchen waste according to claim 4, characterized in that, The automatic water replenishment pipeline is for urban water supply.

6. The co-processing pretreatment system for food waste and kitchen waste according to claim 4, characterized in that, The water source for the automatic water replenishment pipeline comes from three-phase separated wastewater.

7. The co-processing pretreatment system for food waste and kitchen waste according to claim 4, characterized in that, The water source for the automatic water replenishment pipeline comes from the mortar descaling temporary storage tank (V06). One end of the automatic water replenishment pipeline is connected to the mortar descaling temporary storage tank (V06), and the other end of the automatic water replenishment pipeline is connected to the homogenizing tank (V02), the extrusion dewatering buffer tank (V05), and the draining tank (V04).

8. A method for removing sand from a homogenizing tank using a co-processing system for food waste and kitchen waste, characterized in that, The system includes a sand removal step, which includes: during operation, the sewage pumps of the first sand removal device (14), the second sand removal device (16), and the third sand removal device (15) are activated at regular intervals to remove the sand and solid particle sediment deposited at the bottom of the homogenizing tank (V02), the extrusion dewatering buffer tank (V05), and the filtrate tank (V04). In this step, the water level sensor transmits the water level signal inside the homogenizing tank (V02), the extrusion dewatering buffer tank (V05), and the filtrate tank (V04) to the control system. When the set first water level is reached, the automatic water replenishment pipeline is activated to replenish water. When the set second water level is reached, the automatic water replenishment pipeline is closed. The first water level is lower than the second water level.

9. A method for removing sand from a homogenizing tank using a co-processing system for food waste and kitchen waste as described in claim 8, characterized in that, in In the sand removal step, the sewage pumps of the first sand removal device (14), the second sand removal device (16) and the third sand removal device (15) are started once every 2-6 hours, and the duration of each operation is 2-10 minutes.

10. A method for removing sand from a homogenizing tank using a co-processing system for food waste and kitchen waste as described in claim 9, characterized in that, in In the sand removal step, the sand removal of the first sand removal device (14), the second sand removal device (16), and the third sand removal device (15) is not carried out at the same time.

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