System and method for collaboratively processing kitchen waste and restaurant waste

Abstract

The present invention discloses a system and method for collaboratively processing kitchen waste and catering waste. The system comprises a kitchen waste pretreatment unit, a catering waste pretreatment unit, a mixing device and a dry anaerobic fermentation device. The kitchen waste pretreatment unit comprises a kitchen waste inlet, a first leachate outlet, a first inorganic impurity outlet and a crushed kitchen waste outlet; the catering waste pretreatment unit comprises a catering waste inlet, a second inorganic impurity outlet, a third inorganic impurity outlet, a second leachate outlet, a grease outlet, a wastewater outlet and a catering waste slurry outlet; the mixing device comprises a crushed kitchen waste inlet, a catering waste slurry inlet and a mixed organic slurry outlet, and the catering waste slurry inlet is connected to the catering waste slurry outlet; the dry anaerobic fermentation device comprises a mixed organic slurry inlet, a biogas outlet and an anaerobic digestate outlet, and the mixed organic slurry inlet is connected to the mixed organic slurry outlet via a scraper conveyor.

Description

Technical Field

[0001] The present invention belongs to the technical field of resource utilization, harmlessness and reduction of organic solid waste, and specifically relates to a system and method for collaboratively processing kitchen waste and restaurant waste. Background Art

[0002] Catering waste mainly refers to food residues, i.e. food residues from restaurants, hotels, canteens of companies, etc., as well as waste from the processing of fruits, vegetables, meat, oil, pastries, etc. in the back kitchen. Food residues are mainly composed of organic matter such as starch, food fiber, and animal fat. They have the characteristics of high water content, high oil and salt content, easy to ferment and stinky. The composition of catering waste is highly correlated with the eating habits of different places. The water content of catering waste is generally between 85% and 90%, and the organic content of catering waste is above 90%. Other debris mainly includes seafood and shellfish, plastic and rubber, napkins, chopsticks, broken plates and bowls, glass bottles / cups, metal boxes, etc., and the composition is very complex.

[0003] Kitchen waste is currently mainly composed of perishable organic waste such as fruits and vegetables and food scraps discarded in daily household life, leftovers, melon and fruit peels, etc. In addition, the main components of vegetable market waste are organic waste such as discarded rotten fruits, vegetables, fish, poultry and other animal viscera, which are also the main source of kitchen waste. As domestic waste classification is in its infancy, the kitchen waste transported and processed is more complex in composition and has a higher impurity content than catering waste. Kitchen waste and catering waste are similar in nature, but because they are mainly raw materials, they have relatively low salt and oil content.

[0004] At present, the main treatment technologies for catering waste and kitchen waste in my country include crushing and direct discharge, landfill treatment, incineration, fertilizer treatment, etc.:

[0005] (1) Crushing and direct discharge

[0006] Crushing and direct discharge is the main method for European and American countries to deal with small amounts of scattered food waste. The food waste is directly crushed and pulverized at the point of occurrence, and then hydraulically flushed to discharge it into the city's municipal sewer network, where it is combined with urban sewage and sent to the urban sewage treatment plant for centralized treatment. With the development of society and the improvement of people's living standards, the amount of catering waste and kitchen waste is increasing. Catering waste and kitchen waste are crushed and directly discharged into the sewer, without realizing resource utilization and reduction, and it is difficult to apply it to large-scale treatment. Catering waste and kitchen waste have complex compositions and contain fiber substances. If they are discharged into the city's municipal pipe network, it is easy to cause pipe network blockage.

[0007] (2) Landfill treatment technology

[0008] Landfill is the main method of harmless treatment of domestic waste in most countries. However, since it occupies a large amount of land and consumes a lot of land acquisition costs, landfills occupy a large area and have limited treatment capacity. After the service period expires, new landfills still need to be built, further occupying land resources. The leachate from food waste will pollute groundwater and soil, and the odor generated by garbage dumping seriously affects the air quality, causing irreversible secondary pollution to the surrounding large-scale atmosphere and water and soil. There is no resource utilization of garbage. For these reasons, whether in Europe, the United States, Japan or China, landfilling of food waste is not recommended. Many countries have expressly banned the treatment of food waste in landfills.

[0009] Under the current premise of land resource shortage and people's increasing concern about environmental impact, landfill treatment technology is obviously not suitable for the actual situation of food waste treatment in my country. However, as a final treatment method for inorganic impurities after food waste sorting, it has certain feasibility. Therefore, landfill can be used as an auxiliary treatment link for food waste and kitchen waste treatment.

[0010] (3) Incineration treatment technology

[0011] Incineration has a large processing capacity and good volume reduction. The heat generated during the incineration process can be used to generate electricity to realize the energy of garbage. However, since the water content of kitchen waste is above 80% on average and the calorific value is around 2011kJ / kg, it is not suitable for incineration.

[0012] Due to different living habits in various provinces and cities in my country and different levels of collection and classification of food waste, my country's food waste is quite different from that of foreign countries. Its characteristics are high water content and low calorific value, which makes it difficult to directly incinerate it. In addition, the investment in incineration is too high. There is little experience in directly treating food waste by incineration at home and abroad.

[0013] (4) Fertilizer treatment technology

[0014] The fertilizer treatment of food waste mainly refers to aerobic composting technology. The aerobic composting process is to decompose organic solids into soluble organic matter under aerobic conditions using extracellular enzymes secreted by aerobic microorganisms, which then penetrate into cells and achieve the entire composting process through the metabolism of microorganisms. The resulting compost product is rich in humus and nutrients such as N, P, and K. It is both a soil conditioner and a high-quality fertilizer. The optimum moisture content required for the aerobic composting process is 50%-60%. If the moisture exceeds 70%, the temperature of the pile will be difficult to rise and the decomposition rate will be significantly reduced.

[0015] The disadvantages of aerobic composting are that due to the complexity of my country's food waste, the pollution of harmful organic matter, oil, salt and heavy metals cannot be well solved, and the harmlessness is not thorough; the treatment process is not closed, which can easily cause secondary pollution; the quality of organic fertilizer is greatly restricted by the composition of food waste, which often leads to poor sales; the composting treatment cycle is long, occupies a large area, and the sanitary conditions are relatively poor.

[0016] my country started late in the process of composting food waste. At present, the technology used in existing urban waste composting plants in my country is backward, and the degree of mechanization and automation is low. Many compost products do not meet the usage standards, and the finished fertilizers become garbage again due to sales problems.

[0017] (5) Feed technology

[0018] Feed processing technology mainly uses physical means to heat the food waste at high temperature, dry it, sterilize it, remove salt, etc., and can eventually produce usable substances such as protein feed additives.

[0019] There are two ways to make feed: 1) biological treatment feed, the principle is to add the cultured bacteria into the sealed storage tank of food waste, the bacteria will multiply and kill the pathogens to make feed. 2) high temperature disinfection feed, the principle is to use the high temperature disinfection principle to kill the virus, and then crush it into feed for livestock and poultry.

[0020] The more mature method of processing food waste into feed is to use granulation technology, extrusion and drying technology in combination. The bacterial concentration in the feed after extrusion is much lower than that in other samples. Due to the increasing temperature during extrusion, a single screw drying and extrusion process can greatly reduce the concentration of potential pathogens. At present, some manufacturers have developed supporting technical equipment and put it into operation.

[0021] The main problems faced by using food waste as feed are feed safety and homology. In the face of increased disinfection requirements, corresponding adjustments must be made in equipment and technology, thereby increasing processing costs. In addition, the pollution of harmful organic matter and heavy metals cannot be well resolved and the harmlessness is not complete. Therefore, great caution should be exercised in the selection of this technology.

[0022] Therefore, the current technology for processing restaurant waste and kitchen waste needs to be improved. Summary of the invention

[0023] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, one purpose of the present invention is to propose a system and method for the coordinated treatment of kitchen waste and catering waste, which can achieve the coordinated treatment of catering waste and kitchen waste, has a simple and reasonable process, low investment, and can maximize the harmlessness, resource utilization, and reduction of catering waste and kitchen waste, providing a reference for the coordinated treatment of organic waste in my country.

[0024] In one aspect of the present invention, the present invention proposes a system for collaboratively processing kitchen waste and restaurant waste. According to an embodiment of the present invention, the system comprises:

[0025] A kitchen waste pretreatment unit, the kitchen waste pretreatment unit having a kitchen waste inlet, a first leachate outlet, a first inorganic impurity outlet and a crushed kitchen waste outlet;

[0026] A catering waste pretreatment unit, the catering waste pretreatment unit having a catering waste inlet, a second inorganic impurity outlet, a third inorganic impurity outlet, a second leachate outlet, a grease outlet, a wastewater outlet and a catering waste slurry outlet;

[0027] A mixing device, the mixing device having a crushed kitchen waste inlet, a restaurant waste slurry inlet and a mixed organic slurry outlet, the crushed kitchen waste inlet is connected to the crushed kitchen waste inlet, and the restaurant waste slurry inlet is connected to the restaurant waste slurry outlet;

[0028] A dry anaerobic fermentation device is provided, wherein the dry anaerobic fermentation device has a mixed organic slurry inlet, a biogas outlet and an anaerobic digestion liquid outlet, and the mixed organic slurry inlet is connected with the mixed organic slurry outlet through a scraper conveyor.

[0029] According to the system for collaboratively processing kitchen waste and catering waste in an embodiment of the present invention, the catering waste and the kitchen waste are respectively subjected to their respective pretreatment units, so that the leachate and inorganic impurities therein can be separated from the kitchen waste after pretreatment, and the inorganic impurities and grease etc. therein can be separated from the catering waste after pretreatment, and then the crushed kitchen waste obtained after the kitchen waste pretreatment and the catering waste slurry obtained after the catering waste pretreatment are supplied to a mixing device for mixing, and the obtained mixed organic slurry is supplied to a dry anaerobic fermentation device for anaerobic fermentation, so that the organic matter in the mixed organic slurry is naturally degraded in an anaerobic environment to obtain biogas and anaerobic digestate. , because the moisture content of general catering waste is high, while the moisture content of kitchen waste is relatively low, the coordinated anaerobic fermentation adopts dry anaerobic digestion, which can avoid the problems of anaerobic stratification caused by excessive moisture content of catering waste and anaerobic equipment being easily blocked due to the large amount of solid impurities in kitchen waste, give full play to the process advantages of anaerobic fermentation, improve the safety of anaerobic equipment and biogas production efficiency, and dry anaerobic fermentation produces less biogas than wet anaerobic fermentation, which can reduce the problem of biogas treatment, high-temperature dry anaerobic fermentation has high organic load and high biogas production rate, providing benefits for the entire operation project, and dry anaerobic fermentation can avoid secondary pollution problems such as material crusting. Therefore, the use of this system can realize the coordinated treatment of catering waste and kitchen waste, with simple and reasonable process and low investment, and can maximize the harmlessness, resource utilization and reduction of catering waste and kitchen waste, providing reference for the coordinated treatment of organic waste in my country.

[0030] In addition, the system for collaboratively processing kitchen waste and restaurant waste according to the above embodiment of the present invention may also have the following additional technical features:

[0031] In some embodiments of the present invention, the kitchen waste pretreatment unit includes: a garbage storage pit, the garbage storage pit has the kitchen waste inlet, the first leachate outlet and the heap filter material outlet; a drum screen, the drum screen has the heap filter material inlet, the first inorganic impurity outlet and the organic waste outlet, the heap filter material inlet is connected to the heap filter material outlet; a magnetic separator, the magnetic separator has an organic waste inlet, a metal outlet and a magnetically separated waste outlet, the organic waste inlet is connected to the organic waste outlet; a shearing crusher, the shearing crusher has a magnetically separated waste inlet and the crushed kitchen waste outlet, the magnetically separated waste inlet is connected to the magnetically separated waste outlet. In this way, the reduction of kitchen waste can be achieved.

[0032] In some embodiments of the present invention, the restaurant waste pretreatment unit includes: an impurity separator, the impurity separator has the restaurant waste inlet, the second inorganic impurity outlet and the separated material outlet; a crushing and sorting pulping machine, the crushing and sorting pulping machine has a separated material inlet, a water inlet, the third inorganic impurity inlet and an organic slurry outlet, the separated material inlet is connected to the separated material outlet, the water inlet is connected to the first leachate outlet and the second leachate outlet; a cooking device, the cooking device has an organic slurry inlet and a cooked material outlet, the organic slurry inlet is connected to the organic slurry outlet; a three-phase separator, the three-phase separator has a cooked material inlet, the grease outlet, the wastewater outlet and the restaurant waste slurry outlet, the cooked material inlet is connected to the cooked material outlet, and the wastewater outlet is connected to the water inlet. In this way, the reduction of restaurant waste can be achieved.

[0033] In some embodiments of the present invention, the above system further comprises: a biogas purification device, wherein a biological filler layer is provided in the biogas purification device, and the biogas purification device has a first biogas inlet and a desulfurized biogas outlet, wherein the first biogas inlet is connected to the biogas outlet; and a biogas purification device, wherein the biogas purification device has a desulfurized biogas inlet and a vehicle gas outlet, wherein the desulfurized biogas inlet is connected to the desulfurized biogas outlet. Thus, the resource utilization of catering waste and kitchen waste can be realized.

[0034] In some embodiments of the present invention, the system further comprises: a solid-liquid separation device, the solid-liquid separation device having an anaerobic digestion liquid inlet, a biogas residue outlet and a biogas liquid outlet, the anaerobic digestion liquid inlet is connected to the anaerobic digestion liquid outlet; a sewage treatment device, the sewage treatment device having a biogas liquid inlet and a qualified water outlet, the biogas liquid inlet is connected to the biogas liquid outlet. Thus, environmental pollution can be avoided.

[0035] In some embodiments of the present invention, the system further comprises: a biogas boiler, the biogas boiler having a second biogas inlet, a cooling water inlet, a heat exchange flue gas outlet and a steam outlet, the second biogas inlet is connected to the biogas outlet, and the steam outlet is connected to the cooking device. Thus, the system's dependence on external energy can be reduced.

[0036] In another aspect of the present invention, the present invention proposes a method for collaboratively processing kitchen waste and restaurant waste using the above system. According to an embodiment of the present invention, the method comprises:

[0037] (1) supplying kitchen waste to the kitchen waste pretreatment unit for pretreatment to obtain a first leachate, first inorganic impurities and crushed kitchen waste;

[0038] (2) supplying the restaurant waste to the restaurant waste pretreatment unit for pretreatment to obtain second inorganic impurities, third inorganic impurities, second leachate, grease, wastewater and restaurant waste slurry;

[0039] (3) supplying the crushed kitchen waste and the restaurant waste slurry to the mixing device for mixing, so as to obtain a mixed organic slurry;

[0040] (4) The mixed organic slurry is supplied to the dry anaerobic fermentation device for anaerobic fermentation treatment to obtain biogas and anaerobic digestate.

[0041] According to the method for collaboratively treating kitchen waste and catering waste in an embodiment of the present invention, the catering waste and the kitchen waste are respectively subjected to their respective pretreatment units, the leachate and inorganic impurities therein can be separated from the kitchen waste after pretreatment, and the inorganic impurities and grease etc. therein can be separated from the catering waste after pretreatment, and then the crushed kitchen waste obtained after the kitchen waste pretreatment and the catering waste slurry obtained after the catering waste pretreatment are supplied to a mixing device for mixing, and the obtained mixed organic slurry is supplied to a dry anaerobic fermentation device for anaerobic fermentation, so that the organic matter in the mixed organic slurry is naturally degraded in an anaerobic environment to obtain biogas and anaerobic digestate. , because the moisture content of general catering waste is high, while the moisture content of kitchen waste is relatively low, the coordinated anaerobic fermentation adopts dry anaerobic digestion, which can avoid the problems of anaerobic stratification caused by excessive moisture content of catering waste and anaerobic equipment being easily blocked due to the large amount of solid impurities in kitchen waste, give full play to the process advantages of anaerobic fermentation, improve the safety of anaerobic equipment and biogas production efficiency, and dry anaerobic fermentation produces less biogas than wet anaerobic fermentation, which can reduce the problem of biogas treatment, high-temperature dry anaerobic fermentation has high organic load and high biogas production rate, providing benefits for the entire operation project, and dry anaerobic fermentation can avoid secondary pollution problems such as material crusting. Therefore, this method can realize the coordinated treatment of catering waste and kitchen waste, with simple and reasonable process and low investment, and can maximize the harmlessness, resource utilization and reduction of catering waste and kitchen waste, providing reference for the coordinated treatment of organic waste in my country.

[0042] In addition, the method for collaboratively processing kitchen waste and restaurant waste according to the above embodiment of the present invention may also have the following additional technical features:

[0043] In some embodiments of the present invention, step (1) is performed according to the following steps: (1-1) the kitchen waste is supplied to a waste storage pit for heap filtration to obtain a first leachate and a heap filtration material; (1-2) the heap filtration material is supplied to a drum screen for screening to obtain first inorganic impurities and organic waste; (1-3) the organic waste is supplied to a magnetic separator for magnetic separation to obtain metals and magnetically separated waste; (1-4) the magnetically separated waste is supplied to a shearing crusher for shearing and crushing to obtain the crushed kitchen waste. In this way, the reduction of kitchen waste can be achieved.

[0044] In some embodiments of the present invention, step (2) is performed according to the following steps: (2-1) the restaurant waste is supplied to a receiving hopper to obtain the second leachate and the drained restaurant waste; (2-2) the drained restaurant waste is supplied to an impurity separator for separation to obtain the second inorganic impurities and the separated material; (2-3) the separated material, the first leachate and the second leachate are supplied to a crushing and sorting pulping machine for crushing and sorting and pulping to obtain the third impurities and organic slurry; (2-4) the organic slurry is supplied to a cooking device for cooking to obtain the cooked material; (2-5) the cooked material is supplied to a three-phase separator for separation to obtain the grease, the wastewater and the restaurant waste slurry, and a portion of the wastewater is supplied to the crushing and sorting pulping machine in step (2-3). In this way, the reduction of restaurant waste can be achieved.

[0045] In some embodiments of the present invention, the method further comprises: (5) supplying a portion of the biogas to a biogas purification device containing a biological filler layer to obtain desulfurized biogas; (6) supplying the desulfurized biogas to a biogas purification device to obtain vehicle fuel gas. In this way, the resource utilization of restaurant waste and kitchen waste can be achieved.

[0046] In some embodiments of the present invention, the method further comprises: (7) supplying the anaerobic digestion liquid to a solid-liquid separation device for solid-liquid separation to obtain biogas residue and biogas liquid; (8) supplying the biogas liquid to a sewage treatment device for treatment and then discharge in compliance with the standards. Thus, environmental pollution can be avoided.

[0047] In some embodiments of the present invention, the method further comprises: (9) supplying another part of the biogas to a biogas boiler for combustion and then exchanging heat with cooling water to obtain heat exchange flue gas and steam, and supplying the steam to the cooking device in step (2-4). In this way, the system's dependence on external energy can be reduced.

[0048] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0050] Figure 1 is a schematic diagram of the structure of a system for collaboratively processing kitchen waste and restaurant waste according to an embodiment of the present invention;

[0051] Figure 2 is a schematic diagram of the structure of a system for collaboratively processing kitchen waste and restaurant waste according to yet another embodiment of the present invention;

[0052] Figure 3 is a schematic diagram of a system structure for collaboratively processing kitchen waste and restaurant waste according to another embodiment of the present invention;

[0053] Figure 4 is a schematic diagram of a system structure for collaboratively processing kitchen waste and restaurant waste according to another embodiment of the present invention;

[0054] Figure 5 is a schematic diagram of a system structure for collaboratively processing kitchen waste and restaurant waste according to another embodiment of the present invention;

[0055] Figure 6 is a schematic diagram of a system structure for collaboratively processing kitchen waste and restaurant waste according to another embodiment of the present invention;

[0056] Figure 7 is a schematic flow chart of a method for collaboratively processing kitchen waste and restaurant waste according to an embodiment of the present invention;

[0057] Figure 8 is a schematic flow chart of a method for collaboratively processing kitchen waste and restaurant waste according to yet another embodiment of the present invention;

[0058] Fig. 9 is a schematic flow chart of a method for collaboratively processing kitchen waste and restaurant waste according to another embodiment of the present invention;

[0059] Fig.10 is a schematic flow chart of a method for collaboratively processing kitchen waste and restaurant waste according to another embodiment of the present invention;

[0060] Fig.11 is a schematic flow chart of a method for collaboratively processing kitchen waste and restaurant waste according to another embodiment of the present invention;

[0061] Fig.12It is a flow chart of a method for collaboratively processing kitchen waste and restaurant waste according to yet another embodiment of the present invention. DETAILED DESCRIPTION

[0062] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0063] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In one aspect of the present invention, the present invention proposes a system for collaboratively processing kitchen waste and restaurant waste. According to an embodiment of the present invention, referring to 1, the system comprises: a kitchen waste pretreatment unit 100, a restaurant waste pretreatment unit 200, a mixing device 300 and a dry anaerobic fermentation device 400.

[0068] According to an embodiment of the present invention, the kitchen waste pretreatment unit 100 has a kitchen waste inlet 101, a first leachate outlet 102, a first inorganic impurity outlet 103 and a crushed kitchen waste outlet 104, and is suitable for pretreating kitchen waste to obtain a first leachate, a first inorganic impurity and crushed kitchen waste.

[0069] According to one embodiment of the present invention, referring to Figure 2 The kitchen waste pretreatment unit 100 includes a garbage storage pit 11, a drum screen 12, a magnetic separator 13 and a shear crusher 14.

[0070] According to a specific embodiment of the present invention, Figure 2 The garbage storage pit 11 has a kitchen waste inlet 101, a first leachate outlet 102 and a heap filter material outlet 113. Specifically, the kitchen waste enters the unloading room after being weighed and unloaded into the garbage storage pit 11. The kitchen waste is stored in the garbage storage pit, and then is fed to the plate feeder by a grab bucket. The plate feeder is provided with a collecting tank at the bottom, which can collect the kitchen waste leachate. The first leachate collected in the collecting tank flows to the leachate collection tank by gravity. The heap filter material in the hopper is transported by the plate feeder into the belt conveyor, and then enters the drum screen 12 of the subsequent section after being evenly distributed.

[0071] According to a specific embodiment of the present invention, Figure 2The drum screen 12 has a heap filter material inlet 121, a first inorganic impurity outlet 103 and an organic waste outlet 123. The heap filter material inlet 121 is connected to the heap filter material outlet 113 and is suitable for screening the heap filter material obtained above. The screened material is large pieces of plastic, paper and wood blocks, which are the first inorganic impurities. The first inorganic impurities are sent to the incineration system for incineration, and the screened material is organic waste and enters the subsequent magnetic separator 13. Specifically, the drum screen is set to 80mm single-stage screening. The drum screen 12 is provided with a bag breaking knife structure, which has a very high bag breaking efficiency and can effectively avoid the loss of organic matter from the screened material due to unbroken bags.

[0072] According to a specific embodiment of the present invention, Figure 2 The magnetic separator 13 has an organic waste inlet 131, a metal outlet 132 and a magnetically separated waste outlet 133. The organic waste inlet 131 is connected to the organic waste outlet 123 and is suitable for magnetically separating the organic waste obtained from the drum screen 12 so as to separate the metal in the organic waste. The remaining magnetically separated waste is supplied to the subsequent shear crusher 14 for processing.

[0073] According to a specific embodiment of the present invention, Figure 2 The shearing crusher 14 has a post-magnetic separation garbage inlet 141 and a post-crushed kitchen waste outlet 104. The post-magnetic separation garbage inlet 141 is connected to the post-magnetic separation garbage outlet 133, and is suitable for shearing and crushing the post-magnetic separation garbage obtained above to obtain crushed kitchen waste. Specifically, the shearing crusher 14 mainly relies on the principle of "shearing and cutting" to complete the process of crushing kitchen waste. The motor drives the reducer to transmit the torque to the movable knife of the crusher through the knife roller shaft. The knife hook of the movable knife hooks the material and tears it down. The blades of the rollers cut the material like scissors. The crushing ratio is large, the output particle size is large, and the crushing effect on tough materials is good. In addition, the shearing crusher 14 can achieve different particle sizes of crushed materials according to the different blade design sizes. In order to achieve the ideal material particle size, multi-stage crushing can be set as required.

[0074] According to an embodiment of the present invention, referring to Figure 1 The catering waste pretreatment unit 200 has a catering waste inlet 201, a second leachate outlet 207, a second inorganic impurity outlet 202, a third inorganic impurity outlet 203, a grease outlet 204, a wastewater outlet 205 and a catering waste slurry outlet 206, and is suitable for pre-treating catering waste to obtain second inorganic impurities, third inorganic impurities, second leachate, grease, wastewater and catering waste slurry.

[0075] According to one embodiment of the present invention, referring to Figure 3 The restaurant waste pretreatment unit 200 includes an impurity separator 21 , a crushing and sorting pulping machine 22 , a cooking device 23 and a three-phase separator 24 .

[0076] According to a specific embodiment of the present invention, Figure 3 The impurity separator 21 has a restaurant waste inlet 201, a second inorganic impurity outlet 202, a second leachate outlet 207, and a separated material outlet 213, and is suitable for separating restaurant waste so as to obtain second inorganic impurities containing larger particle sizes of plastics, metals, glass, etc., second leachate, and separated material. Specifically, after the restaurant waste is collected and metered into the factory, the restaurant waste is passed through the impurity separator to separate impurities such as plastics, metals, glass, etc. with larger particle sizes, and the remaining separated material is supplied to the receiving hopper. At the same time, the liquid in the separated material is filtered out by the water filter spiral at the bottom of the receiving hopper to drain the second leachate and flow into the leachate collection tank for temporary storage. The receiving hopper area is as closed as possible to prevent odor from overflowing, and the generated odor is led out by the induced draft fan and sent to the deodorization system. At the same time, the impurity separator is arranged before the receiving hopper to remove large substances in the restaurant waste in the front section, effectively avoiding the blocking problem of the pre-treatment unit conveying and crushing equipment. The impurity separator device is a spiral structure, which does not entangle, block, or hang materials. It should be noted that those skilled in the art can select a specific structure of the impurity separator according to actual needs, as long as it can achieve effective sorting of large materials such as glass bottles, plates, dishes, plastics and other debris, and ensure that brittle debris is not broken during the sorting process (reducing the difficulty of sand removal in the subsequent process and reducing the wear of the conveying system). In addition, the receiving hopper is installed in the unloading pit. The unloading room produces a large amount of odor. The design adopts two infrared fast canvas shutter doors to prevent the odor from overflowing from the unloading room as much as possible. The unloading room is equipped with a deodorization pipeline collection vent and a plant liquid spraying system to ensure fresh air in the unloading area. The top of the receiving hopper adopts a sealed design, and the discharge port cover is interlocked with the infrared fast shutter door of the unloading room. An exhaust port is installed on the top of the receiving hopper, and the odor is collected under negative pressure and sent to the deodorization system to prevent the odor from overflowing. The screw conveyor at the bottom of the receiving hopper adopts a double screw design to ensure smooth material transportation. The contact parts of the screw conveyor and the material are made of 304 stainless steel to ensure the corrosion resistance of the equipment.

[0077] According to a specific embodiment of the present invention, Figure 3The crushing and sorting pulping machine 22 has a separated material inlet 221, a water inlet 222, a third inorganic impurity inlet 203 and an organic slurry outlet 223. The separated material inlet 221 is connected to the separated material outlet 213, and the water inlet 222 is connected to the first leachate outlet 102 and the second leachate outlet 207. It is suitable for crushing and sorting the separated material obtained above with the first leachate and the second leachate for pulping, so as to separate the third inorganic impurities such as metal, plastic, bamboo, chopsticks, bones, etc. in the separated material, and the obtained organic slurry is supplied to the subsequent cooking device 23. The crushing and sorting pulping machine adopts a fully enclosed mechanized continuous operation, which can realize the efficient removal of light materials and fragile and non-fragile materials, and can effectively solve the problem that catering waste is difficult to handle due to high viscosity and many sundries. The crushing and sorting pulping machine integrates material crushing, pulping and impurity sorting, with a high degree of automation, compact structure and complete functions. The parts of the equipment that are in contact with the materials are made of stainless steel with strong corrosion resistance. The breaker is made of alloy with high strength and good wear resistance. In addition, the first leachate obtained from the pretreatment of the above-mentioned kitchen waste and the second leachate obtained from the pretreatment of the catering waste are supplied to the crushing and sorting pulping machine, which not only eliminates the supply of external tap water, but also realizes the resource utilization of the leachate.

[0078] According to a specific embodiment of the present invention, Figure 3 The cooking device 23 has an organic slurry inlet 231 and a cooking material outlet 232. The organic slurry inlet 231 is connected to the organic slurry outlet 223 and is suitable for cooking the organic slurry obtained above to obtain the cooking material. Specifically, the catering waste has a high fat content. If it is not separated, it will enter the subsequent dry anaerobic fermentation device, which will cause long-chain fatty acid poisoning of anaerobic bacteria, thereby affecting the treatment effect of anaerobic digestion. Therefore, most of the fat in the catering waste must be separated. The fat in the catering waste mainly exists in the form of floating oil, dispersed oil, emulsified oil, and solid internal oil. Among them, the floating oil droplet has a larger particle size and can float and separate by standing still, while the dispersed oil, emulsified oil and solid internal oil are relatively poor using general gravity separation methods. The present application heats the organic slurry in the cooking device to 65-70°C, which can convert most of the fat contained in the organic slurry into floating oil, thereby facilitating the subsequent separation of fat.

[0079] According to a specific embodiment of the present invention, Figure 3The three-phase separator 24 has a cooking material inlet 241, a fat outlet 204, a wastewater outlet 205 and a restaurant waste slurry outlet 206. The cooking material inlet 241 is connected to the cooking material outlet 232, and the wastewater outlet 205 is connected to the water inlet 222. It is suitable for performing three-phase separation on the cooking material obtained above, so as to separate fat, wastewater and restaurant waste slurry, and return part of the separated wastewater to the crushing and sorting pulping machine 22 to participate in pulping. Specifically, the fat in the cooking material is separated by the high-speed centrifugal principle of the three-phase separator, and the fat is stored and sold regularly, while ensuring that the fat content requirement of the organic slurry before entering the subsequent dry anaerobic fermentation device 400 is met. Part of the separated wastewater is returned to the crushing and sorting pulping machine 22 to participate in pulping, and the remaining wastewater is mixed with the solid material separated in the three-phase separator 24 to obtain restaurant waste slurry.

[0080] According to an embodiment of the present invention, referring to Figure 1 The mixing device 300 has a crushed kitchen waste inlet 301, a restaurant waste slurry inlet 302 and a mixed organic slurry outlet 303. The crushed kitchen waste inlet 301 is connected to the crushed kitchen waste inlet 104, and the restaurant waste slurry inlet 302 is connected to the restaurant waste slurry outlet 206. The mixing device 300 is suitable for mixing the crushed kitchen waste obtained by the kitchen waste pretreatment unit 100 and the restaurant waste slurry obtained by the restaurant waste pretreatment unit 200 to obtain a mixed organic slurry. Preferably, the mass ratio of the crushed kitchen waste to the restaurant waste slurry is not less than 1.53. The inventors have discovered that if the mass ratio of kitchen waste to catering waste slurry after crushing is lower than 1.53, the reaction conditions for dry anaerobic fermentation cannot be met, and only semi-dry anaerobic fermentation or even wet anaerobic fermentation can be carried out, thereby failing to achieve dry anaerobic coordinated treatment of kitchen waste and catering waste. The present application controls the mass ratio of kitchen waste to catering waste slurry after crushing to be no less than 1.53, thereby ensuring that the feeding conditions meet the reaction conditions for dry anaerobic fermentation, avoiding problems such as excessive moisture content of catering waste leading to easy anaerobic stratification and excessive solid impurities in kitchen waste leading to easy clogging of anaerobic equipment, giving full play to the technological advantages of dry anaerobic fermentation and improving the safety of anaerobic equipment and biogas production efficiency.

[0081] According to an embodiment of the present invention, the dry anaerobic fermentation device 400 has a mixed organic slurry inlet 401, a biogas outlet 402 and an anaerobic digestion liquid outlet 403. The mixed organic slurry inlet 401 is connected to the mixed organic slurry outlet 303 through a scraper conveyor 41, and is suitable for using the scraper conveyor 41 to supply the mixed organic slurry obtained in the mixing device 300 to the dry anaerobic fermentation device 400 for anaerobic fermentation, so as to obtain biogas and anaerobic digestion liquid. The inventors have discovered that by supplying the organic slurry obtained by mixing the crushed kitchen waste obtained after kitchen waste pretreatment and the catering waste slurry obtained by pretreatment of catering waste to a dry anaerobic fermentation device for anaerobic fermentation, the organic matter in the mixed organic slurry is naturally degraded in an anaerobic environment to obtain biogas and anaerobic digestate. Since the moisture content of general catering waste is relatively high, while the moisture content of kitchen waste is relatively low, the coordinated anaerobic fermentation adopts dry anaerobic digestion, which can avoid the problems of anaerobic stratification due to excessive moisture content of catering waste and anaerobic device clogging due to more solid impurities in kitchen waste, give full play to the process advantages of anaerobic fermentation, improve the safety of anaerobic device and biogas production efficiency, and dry anaerobic fermentation produces less biogas liquid than wet anaerobic fermentation, which can reduce the problem of biogas liquid treatment, high-temperature dry anaerobic fermentation has a high organic load and a high biogas production rate, which provides benefits for the entire operating project, and dry anaerobic fermentation can avoid secondary pollution problems such as material crusting.

[0082] Specifically, the solid content of the mixed organic slurry obtained by pre-treating the catering waste and the crushed kitchen waste obtained by pre-treating the kitchen waste is greater than 20wt%. The use of screw pumps, slurry pumps, etc. is prone to blockage. The present application uses a scraper conveyor to transport the mixed organic slurry obtained by the mixing device to the dry anaerobic fermentation device, which can effectively avoid material blockage and solve the problem of high equipment failure rate.

[0083] The mixed organic slurry obtained by pre-treatment of catering waste and the crushed kitchen waste obtained by pre-treatment of kitchen waste is sent to the dry anaerobic fermentation device through a plate conveyor, and then biodegraded in a closed environment. After about 20 days of anaerobic fermentation, the organic matter part is biodegraded and biogas is produced. The residue after anaerobic fermentation is anaerobic digestion liquid. In addition, the dry anaerobic fermentation tank is a steel-concrete structure with on-site civil construction. A stirrer is provided in the fermentation device to ensure that the materials in the fermentation device are stirred evenly. At the same time, the fermentation temperature is controlled to be 50-60°C, preferably 55°C. The dry anaerobic fermentation device adopts a coil heating method, and insulation measures are adopted on the outer wall to reduce heat loss. At the same time, the dry anaerobic fermentation device is equipped with an online instrument to monitor the material height, temperature, pH, biogas pressure and other parameters in the dry anaerobic fermentation device in real time to ensure the stable operation of the anaerobic fermentation device.

[0084] According to the system for collaboratively processing kitchen waste and catering waste in an embodiment of the present invention, the catering waste and the kitchen waste are respectively subjected to their respective pretreatment units, so that the leachate and inorganic impurities therein can be separated from the kitchen waste after pretreatment, and the inorganic impurities and grease etc. therein can be separated from the catering waste after pretreatment, and then the crushed kitchen waste obtained after the kitchen waste pretreatment and the catering waste slurry obtained after the catering waste pretreatment are supplied to a mixing device for mixing, and the obtained mixed organic slurry is supplied to a dry anaerobic fermentation device for anaerobic fermentation, so that the organic matter in the mixed organic slurry is naturally degraded in an anaerobic environment to obtain biogas and anaerobic digestate. , because the moisture content of general catering waste is high, while the moisture content of kitchen waste is relatively low, the coordinated anaerobic fermentation adopts dry anaerobic digestion, which can avoid the problems of anaerobic stratification caused by excessive moisture content of catering waste and anaerobic equipment being easily blocked due to the large amount of solid impurities in kitchen waste, give full play to the process advantages of anaerobic fermentation, improve the safety of anaerobic equipment and biogas production efficiency, and dry anaerobic fermentation produces less biogas than wet anaerobic fermentation, which can reduce the problem of biogas treatment, high-temperature dry anaerobic fermentation has high organic load and high biogas production rate, providing benefits for the entire operation project, and dry anaerobic fermentation can avoid secondary pollution problems such as material crusting. Therefore, the use of this system can realize the coordinated treatment of catering waste and kitchen waste, with simple and reasonable process and low investment, and can maximize the harmlessness, resource utilization and reduction of catering waste and kitchen waste, providing reference for the coordinated treatment of organic waste in my country.

[0085] Further, refer to Figure 4 The above-mentioned system for collaboratively processing kitchen waste and catering waste also includes a biogas purification device 500 and a biogas purification device 600.

[0086] According to an embodiment of the present invention, a biogas purification device 500 is provided with a biological filler layer (not shown), and the biogas purification device 500 has a first biogas inlet 501 and a desulfurized biogas outlet 502. The first biogas inlet 501 is connected to the biogas outlet 402 and is suitable for purifying a portion of the biogas obtained in the above-mentioned dry anaerobic fermentation device 400 to obtain desulfurized biogas. Specifically, the biogas purification device includes a biological desulfurization tower and a dry desulfurization device connected in sequence. The biogas generated by the dry anaerobic fermentation device is first sent to the biological desulfurization tower. A biological filler layer with a high porosity, high buffering capacity and high water holding capacity is added to the biological desulfurization tower to ensure that microorganisms with desulfurization characteristics can attach and grow on it. And by arranging a nutrient solution circulation spray inside the biological desulfurization tower, the desulfurization bacteria are cultivated using the rich microorganisms and nutrients therein, so that the H in the biogas 2 S is oxidized to generate S and further oxidized to generate S 2 O 3 2- 、SO 42- etc., thereby achieving the removal of H 2 The purpose of S is to use a biological desulfurization tower to remove H 2 The S concentration is reduced from 2500ppm to 200ppm, and the biogas treated by the biological desulfurization tower is subjected to dry desulfurization by the dry desulfurization device. The dry desulfurization is to fill a certain height of desulfurization agent in the desulfurization equipment, and the biogas after the biological desulfurization tower passes through the desulfurization agent from bottom to top, H 2 S is removed to achieve the desulfurization process, in which the desulfurizer uses iron oxide as the main active catalytic component, and adds a variety of co-catalysts and carriers to remove H through catalytic action at normal temperature and pressure. 2 S, the desulfurization rate can reach more than 90%, and the H in the biogas after biological desulfurization can be 2 S further dropped to below 7.5ppm. It should be noted that those skilled in the art can select the biological filler layer and the desulfurization bacteria group according to actual needs, as long as the above-mentioned desulfurization function can be achieved. The dry desulfurization continuous regeneration process has the characteristics of high sulfur capacity, small bed resistance, convenient operation, continuous regeneration, and simple regeneration process. The principle of the desulfurization regeneration process is as follows:

[0087] Desulfurization: Fe 2 O 3 ·H 2 O+3H 2 S=Fe 2 S 3 ·H 2 O+3H 2 O

[0088] Regeneration: 2Fe 2 S 3 ·H 2 O+3O 2 =2Fe 2 O 3 ·H 2 O+6S

[0089] Combining the above two reaction equations, the desulfurization regeneration reaction equation is as follows: 2 S+1 / 2O 2 =S+H 2 O (reaction conditions are Fe 2 O 3 ·H 2 It should be noted that those skilled in the art can select the biological filler layer and the desulfurization bacteria group according to actual needs, as long as the above-mentioned desulfurization function can be achieved.

[0090] According to an embodiment of the present invention, the biogas purification device 600 has a desulfurized biogas inlet 601 and a vehicle fuel gas outlet 602. The desulfurized biogas inlet 601 is connected to the desulfurized biogas outlet 502 and is suitable for purifying the desulfurized biogas obtained above to obtain vehicle fuel gas. Specifically, the biogas purification device 600 is a membrane purification device. The desulfurized biogas obtained above is first pre-treated to remove particulate matter, moisture, oily substances, etc. in the biogas, and then the gas inlet meets the intake requirements for entering the membrane purification device (pressure 2-3Kpa; temperature <55°C; CH 4 55~65vol%;CO 2 35~45vol%;H 2 S<7.5mg / Nm 3 ;H 2 O 50%~100%RH; Note: The standard reference conditions for gas volume in this standard are 101.325kPa, 20℃) and then supplied to the membrane purification equipment. The membrane assembly performs rough and fine decarbonization on the biogas. After membrane purification, CH 4 The purity of the natural gas product is higher than 97%. The membrane module can also remove the moisture in the biogas, so that the dew point of the biogas can fully meet the dew point requirements of vehicle fuel gas. The waste gas separated by membrane purification can be discharged directly, or CO 2 After recycling, biogas with a purity higher than 97% enters the CNG compressor system, and the pressure is increased to 25MPa by the compressor to meet the pressure standard of vehicle gas, and then added to the skid-mounted vehicle through the gas filling column, which can be sold or transported to surrounding gas filling stations for use. The membrane assembly is the core of the entire membrane purification equipment. After the carbon dioxide passes through the secondary hollow fiber membrane group, it meets the design output requirements. The external exhaust of the system is discharged in the primary membrane group and becomes exhaust gas. After passing through the secondary membrane group, the exhaust gas of the secondary membrane group returns to the pressure stabilizing buffer tank through reflux to complete the closed cycle. The working principle of the hollow fiber membrane is to separate different gas molecules through the different permeation rates of different gases in the hollow fiber membrane of the polymer material. Among them, the gas with a fast permeation rate is called "fast gas" and the gas with a slow permeation rate is called "slow gas". Because of its fast permeation, most of the "fast gas" is enriched at the inlet end, and a small part penetrates to the exhaust end; because of its slow permeation, most of the "slow gas" penetrates the membrane group to the exhaust end, and a small part is enriched at the inlet end. Water, hydrogen sulfide, carbon dioxide and oxygen in biogas are all "fast gases", while nitrogen and methane are "slow gases". Therefore, the selective permeation adsorption characteristics of the membrane module determine that membrane biogas purification can not only remove a large amount of carbon dioxide, but also remove some hydrogen sulfide and oxygen impurities.

[0091] Further, refer to Figure 5The above-mentioned system for collaboratively processing kitchen waste and catering waste also includes: a solid-liquid separation device 700 and a sewage treatment device 800.

[0092] According to an embodiment of the present invention, the solid-liquid separation device 700 has an anaerobic digestion liquid inlet 701, a biogas residue outlet 702 and a biogas liquid outlet 703. The anaerobic digestion liquid inlet 701 is connected to the anaerobic digestion liquid outlet 403 and is suitable for performing solid-liquid separation on the anaerobic digestion liquid obtained in the above-mentioned dry anaerobic fermentation device 400 to obtain biogas residue and biogas liquid. Specifically, the solid-liquid separation device 700 is a two-phase horizontal screw centrifuge. The anaerobic digestion liquid produced by the dry anaerobic fermentation device 400 is pumped to the two-phase horizontal screw centrifuge. The two-phase horizontal screw centrifuge utilizes the density difference between the solid and liquid phases. Under the action of the centrifuge, the sedimentation rate of the solid phase particles is accelerated to achieve solid-liquid separation. The separation process is that the anaerobic digestion liquid after adding a flocculant (for example, the flocculant is PAM or iron salt) is sent to the mixing chamber in the drum of the two-phase horizontal screw centrifuge through the inlet pipe. Due to the high-speed rotation of the rotor and the friction resistance The anaerobic digestion liquid is accelerated in the rotor and forms a cylindrical liquid ring layer. Under the action of centrifugal force, solid particles with larger specific gravity settle to the inner wall of the drum to form a mud layer. The relative speed difference between the spiral and the drum is then used to push the solid phase to the conical end of the drum. After being pushed out of the liquid surface, the mud residue is dehydrated and dried, and pushed to the slag discharge port for discharge. The supernatant is discharged from the large end of the drum to achieve solid-liquid separation. The biogas residue containing 80% water produced after solid-liquid separation is sent to the incineration plant for incineration, and the produced biogas liquid is pumped to the subsequent sewage treatment device 800 for treatment.

[0093] According to an embodiment of the present invention, the sewage treatment device 800 has a biogas slurry inlet 801 and a standard water outlet 802, and the biogas slurry inlet 801 is connected to the biogas slurry outlet 703, and is suitable for purifying the biogas slurry to achieve standard discharge of wastewater. It should be noted that those skilled in the art can select the specific operation of the purification process according to actual needs, as long as the standard discharge of biogas slurry can be achieved, and it will not be repeated here.

[0094] Further, refer to Figure 6 The above-mentioned system for collaboratively processing kitchen waste and catering waste also includes: a biogas boiler 900, which has a second biogas inlet 901, a cooling water inlet 902, a heat exchange flue gas outlet 903 and a steam outlet 904. The second biogas inlet 901 is connected to the biogas outlet 402, and the steam outlet 904 is connected to the cooking device 23, and is suitable for burning another part of the biogas obtained by the above-mentioned dry anaerobic fermentation device 400 and then exchanging heat with cooling water to obtain heat exchange flue gas and steam, and supplying the steam to the cooking device 23 as a heat source for heating the organic slurry.

[0095] In another aspect of the present invention, the present invention proposes a method for collaboratively processing kitchen waste and restaurant waste using the above system. Figure 7 , the method comprising:

[0096] S100: Supplying the kitchen waste to the kitchen waste pretreatment unit for pretreatment

[0097] In this step, the kitchen waste is supplied to a kitchen waste pretreatment unit for pretreatment, so as to obtain a first leachate, first inorganic impurities and crushed kitchen waste.

[0098] According to one embodiment of the present invention, referring to Figure 8 , step S100 is performed according to the following steps:

[0099] S110: Feeding kitchen waste into the waste storage pit for heap filtration

[0100] In this step, the kitchen waste is supplied to the garbage storage pit for heap filtration to obtain the first leachate and the heap filtration material. Specifically, the kitchen waste is weighed and then enters the unloading room and is unloaded into the garbage storage pit 11. The kitchen waste is stored in the garbage storage pit, and then the grab bucket is used to feed the plate feeder. The plate feeder is provided with a collecting tank at the bottom, which can collect the kitchen waste leachate. The leachate collected in the collecting tank flows to the leachate collection pool by gravity. The heap filtration material in the hopper is transported by the plate feeder into the belt conveyor, and after being evenly distributed, it enters the drum screen 12 of the subsequent section.

[0101] S120: Feed the filtered material to the drum screen for screening

[0102] In this step, the heap filtered material is supplied to the drum screen for screening, and the screened material is large pieces of plastic, paper, wood, etc., which are the first inorganic impurities, which are sent to the incineration system for incineration, and the screened material obtained is organic waste and enters the subsequent magnetic separator 13. Specifically, the drum screen is set to 80mm single-stage screening, and the drum screen 12 is provided with a bag breaking knife structure, which has a very high bag breaking efficiency and can effectively avoid the loss of organic matter from the screened material due to unbroken bags.

[0103] S130: Supplying organic waste to a magnetic separator for magnetic separation

[0104] In this step, the organic waste obtained above is supplied to a magnetic separator for magnetic separation so as to separate the metal in the organic waste, and the remaining waste after magnetic separation is supplied to a subsequent shearing crusher 14 for processing.

[0105] S140: Supply the magnetically separated garbage to the shear crusher for shear crushing

[0106] In this step, the above-obtained magnetically separated garbage is supplied to a shearing crusher for shearing and crushing, so as to obtain the crushed kitchen waste. Specifically, the shearing crusher 14 mainly relies on the principle of "shearing and cutting" to complete the process of crushing kitchen waste. The motor drives the reducer to transmit the torque to the movable knife of the crusher through the knife roller shaft. The knife hook of the movable knife hooks the material and tears it down. The blades of the rollers cut the material like scissors. The crushing ratio is large, the output particle size is large, and the crushing effect on tough materials is good. In addition, the shearing crusher 14 can achieve different particle sizes of crushed materials according to the different blade design sizes. In order to achieve the ideal material particle size, multi-stage crushing can be set as required.

[0107] S200: Supplying restaurant waste to a restaurant waste pretreatment unit for pretreatment

[0108] In this step, the catering waste is supplied to the catering waste pretreatment unit for pretreatment, so as to obtain the second inorganic impurities, the third inorganic impurities, the second leachate, grease, wastewater and catering waste slurry.

[0109] According to one embodiment of the present invention, referring to Fig. 9 , step S200 is performed according to the following steps:

[0110] S210: Feeding restaurant waste to the impurity separator for separation

[0111] In this step, the catering waste is supplied to the impurity separator for separation, so as to obtain the second inorganic impurities containing plastics, metals, glass, etc. with larger particle sizes, the second leachate, and the separated material. Specifically, after the catering waste is collected and metered in the factory, the catering waste is passed through the impurity separator to separate the impurities such as plastics, metals, glass, etc. with larger particle sizes, and the remaining separated material is supplied to the receiving hopper. At the same time, the liquid in the separated material is filtered out by the water filter spiral at the bottom of the receiving hopper to drain the second leachate and flow into the leachate collection tank for temporary storage. The receiving hopper area is as closed as possible to prevent the odor from overflowing, and the generated odor is led out by the induced draft fan and sent to the deodorization system. At the same time, the impurity separator is arranged before the receiving hopper to remove the large substances in the catering waste in the front section, effectively avoiding the jamming problem of the pre-treatment unit conveying and crushing equipment. The impurity separator device is a spiral structure, which does not entangle, block, or hang materials. It should be noted that those skilled in the art can select a specific structure of the impurity separator according to actual needs, as long as it can achieve effective sorting of large materials such as glass bottles, plates, dishes, plastics and other debris, and ensure that brittle debris is not broken during the sorting process (reducing the difficulty of sand removal in the subsequent process and reducing the wear of the conveying system). In addition, the receiving hopper is installed in the unloading pit. The unloading room produces a large amount of odor. The design adopts two infrared fast canvas shutter doors to prevent the odor from overflowing from the unloading room as much as possible. The unloading room is equipped with a deodorization pipeline collection vent and a plant liquid spraying system to ensure fresh air in the unloading area. The top of the receiving hopper adopts a sealed design, and the discharge port cover is interlocked with the infrared fast shutter door of the unloading room. An exhaust port is installed on the top of the receiving hopper, and the odor is collected under negative pressure and sent to the deodorization system to prevent the odor from overflowing. The screw conveyor at the bottom of the receiving hopper adopts a double screw design to ensure smooth material transportation. The contact parts of the screw conveyor and the material are made of 304 stainless steel to ensure the corrosion resistance of the equipment.

[0112] S220: The separated material and the first leachate and the second leachate are supplied to a crushing and sorting pulping machine for crushing and sorting and then pulping

[0113] In this step, the separated material obtained above and the first leachate and the second leachate are supplied to the crushing and sorting pulping machine for crushing and sorting and then pulping, so as to separate the third inorganic impurities such as metal, plastic, bamboo, chopsticks, bones, etc. in the separated material, and the obtained organic pulp is supplied to the subsequent cooking device 23. The crushing and sorting pulping machine adopts a fully enclosed mechanized continuous operation, which can realize the efficient removal of light materials and fragile and non-fragile materials, and can effectively solve the problem that catering waste is difficult to handle due to high viscosity and many sundries. The crushing and sorting pulping machine integrates material crushing, pulping and impurity sorting, with a high degree of automation, compact structure and complete functions. The parts of the equipment in contact with the material are made of stainless steel, which has strong corrosion resistance. The crushing hammer is made of alloy material, which has high strength and good wear resistance. In addition, the first leachate obtained by the pretreatment of the above-mentioned kitchen waste and the second leachate obtained after the pretreatment of the catering waste are supplied to the crushing and sorting pulping machine in this application, which not only saves the supply of external tap water, but also realizes the resource utilization of the leachate.

[0114] S230: Supplying the organic slurry to a cooking device for cooking

[0115] In this step, the organic slurry is supplied to a cooking device for cooking to obtain a cooked material. Specifically, the catering waste has a high fat content. If it is not separated, it will enter the subsequent dry anaerobic fermentation device, which will cause long-chain fatty acid poisoning of anaerobic bacteria, thereby affecting the treatment effect of anaerobic digestion. Therefore, most of the fat in the catering waste must be separated. The fat in the catering waste mainly exists in the form of floating oil, dispersed oil, emulsified oil, and solid internal oil. Among them, the floating oil droplets have a larger particle size and can float and separate by standing, while the dispersed oil, emulsified oil and solid internal oil are relatively poor using general gravity separation methods. The present application sets a cooking device to heat the organic slurry therein to 65-70°C, so that most of the fat contained in the organic slurry can be converted into floating oil, which is beneficial to the subsequent separation of fat.

[0116] S240: The steamed material is supplied to a three-phase separator for separation, and the waste water is supplied to step S220

[0117] In this step, the steamed material obtained above is supplied to the three-phase separator for three-phase separation, so as to separate grease, wastewater and catering waste slurry, and the separated wastewater is returned to the crushing and sorting pulping machine 22 of step S220 to participate in pulping. Specifically, the grease in the steamed material is separated by the high-speed centrifugal principle of the three-phase separator, and the grease is stored and sold regularly, while ensuring the grease content requirement before the organic slurry enters the subsequent dry anaerobic fermentation device 400. Part of the separated wastewater is returned to the crushing and sorting pulping machine 22 to participate in pulping, and the remaining wastewater is mixed with the solid material separated in the three-phase separator 24 to obtain catering waste slurry.

[0118] S300: The crushed kitchen waste and restaurant waste slurry are supplied to the mixing device for mixing

[0119] In this step, the crushed kitchen waste obtained by the kitchen waste pretreatment unit 100 in the above step S100 and the restaurant waste slurry obtained by the restaurant waste pretreatment unit 200 in the above step S200 are supplied to the mixing device 300 for mixing to obtain a mixed organic slurry. Preferably, the mass ratio of the crushed kitchen waste to the restaurant waste slurry is not less than 1.53. The inventors found that if the mass ratio of the kitchen waste to the restaurant waste slurry after crushing is lower than 1.53, the reaction conditions of dry anaerobic fermentation cannot be met, and only semi-dry anaerobic fermentation or even wet anaerobic fermentation can be performed, so that the dry anaerobic synergistic treatment of kitchen waste and restaurant waste cannot be achieved. The present application controls the mass ratio of the crushed kitchen waste to the restaurant waste slurry to be not less than 1.53, so as to ensure that the feeding conditions meet the reaction conditions of dry anaerobic fermentation, avoid problems such as excessive moisture content of restaurant waste leading to easy anaerobic stratification and more solid impurities in kitchen waste leading to easy clogging of anaerobic devices, give full play to the process advantages of dry anaerobic fermentation, and improve the safety of anaerobic devices and biogas production efficiency.

[0120] S400: The mixed organic slurry is supplied to the dry anaerobic fermentation device for anaerobic fermentation treatment

[0121] In this step, the mixed organic slurry obtained above is supplied to the dry anaerobic fermentation device 400 for anaerobic fermentation treatment to obtain biogas and anaerobic digestion liquid. The inventors have discovered that by supplying the organic slurry obtained by mixing the crushed kitchen waste obtained after pretreatment of kitchen waste and the solid residue obtained by pretreatment of catering waste to a dry anaerobic fermentation device for anaerobic fermentation, the organic matter in the mixed organic slurry is naturally degraded in an anaerobic environment to obtain biogas and anaerobic digestate. Since the moisture content of general catering waste is relatively high, while the moisture content of kitchen waste is relatively low, the coordinated anaerobic fermentation adopts dry anaerobic digestion, which can avoid the problems of anaerobic stratification due to excessive moisture content of catering waste and anaerobic device clogging due to more solid impurities in kitchen waste, give full play to the technological advantages of anaerobic fermentation, improve the safety of anaerobic device and biogas production efficiency, and dry anaerobic fermentation produces less biogas liquid than wet anaerobic fermentation, which can reduce the problem of biogas liquid treatment, high-temperature dry anaerobic fermentation has a high organic load and a high biogas production rate, which provides benefits for the entire operating project, and dry anaerobic fermentation can avoid secondary pollution problems such as material crusting.

[0122] Specifically, the solid content of the mixed organic slurry obtained by pre-treating the catering waste and the crushed kitchen waste obtained by pre-treating the kitchen waste is greater than 20wt%. The use of screw pumps, slurry pumps, etc. is prone to blockage. The present application uses a scraper conveyor to transport the mixed organic slurry obtained by the mixing device to the dry anaerobic fermentation device, which can effectively avoid material blockage and solve the problem of high equipment failure rate.

[0123] The mixed organic slurry obtained by pre-treatment of catering waste and the crushed kitchen waste obtained by pre-treatment of kitchen waste is sent to the dry anaerobic fermentation device through a plate conveyor, and then biodegraded in a closed environment. After about 20 days of anaerobic fermentation, the organic matter part is biodegraded and biogas is produced. The residue after anaerobic fermentation is anaerobic digestion liquid. In addition, the dry anaerobic fermentation tank is a steel-concrete structure with on-site civil construction. A stirrer is provided in the fermentation device to ensure that the materials in the fermentation device are stirred evenly. At the same time, the fermentation temperature is controlled to be 50-60°C, preferably 55°C. The dry anaerobic fermentation device adopts a coil heating method, and insulation measures are adopted on the outer wall to reduce heat loss. At the same time, the dry anaerobic fermentation device is equipped with an online instrument to monitor the material height, temperature, pH, biogas pressure and other parameters in the dry anaerobic fermentation device in real time to ensure the stable operation of the anaerobic fermentation device.

[0124] According to the method for collaboratively treating kitchen waste and catering waste in an embodiment of the present invention, the catering waste and the kitchen waste are respectively subjected to their respective pretreatment units, so that the leachate and inorganic impurities therein can be separated after the pretreatment of the kitchen waste, and the inorganic impurities and grease etc. therein can be separated after the pretreatment of the catering waste, and then the crushed kitchen waste obtained after the pretreatment of the kitchen waste and the catering waste slurry obtained after the pretreatment of the catering waste are supplied to a mixing device for mixing, and the obtained organic slurry is supplied to a dry anaerobic fermentation device for anaerobic fermentation, so that the organic matter in the mixed organic slurry is naturally degraded in an anaerobic environment to obtain biogas and anaerobic digestate. Since the moisture content of general catering waste is high, while the moisture content of kitchen waste is relatively low, the coordinated anaerobic fermentation adopts dry anaerobic digestion, which can avoid the problems of anaerobic stratification caused by excessive moisture content of catering waste and anaerobic equipment being easily blocked due to more solid impurities in kitchen waste, give full play to the process advantages of anaerobic fermentation, improve the safety of anaerobic equipment and biogas production efficiency, and dry anaerobic fermentation produces less biogas than wet anaerobic fermentation, which can reduce the problem of biogas treatment, high-temperature dry anaerobic fermentation has high organic load and high biogas production rate, providing benefits for the entire operation project, and dry anaerobic fermentation can avoid secondary pollution problems such as material crusting. Therefore, this method can realize the coordinated treatment of catering waste and kitchen waste, with simple and reasonable process and low investment, and can maximize the harmlessness, resource utilization and reduction of catering waste and kitchen waste, providing reference for the coordinated treatment of organic waste in my country.

[0125] Further, refer to Fig.10 The above-mentioned method for collaboratively processing kitchen waste and restaurant waste also includes

[0126] S500: Supply part of the biogas to a biogas purification device containing a biofiller layer

[0127] In this step, a part of the biogas obtained in the above step S400 is supplied to a biogas purification device containing a biological filler layer for purification, so as to obtain desulfurized biogas. Specifically, the biogas purification device includes a biological desulfurization tower and a dry desulfurization device connected in sequence. The biogas produced by the dry anaerobic fermentation device is first sent to the biological desulfurization tower. A biological filler layer with high porosity, high buffering capacity and high water holding capacity is added inside the biological desulfurization tower to ensure that microorganisms with desulfurization characteristics can attach and grow on it. And by setting a nutrient solution circulation spray inside the biological desulfurization tower, the desulfurization bacteria are cultivated using the rich microorganisms and nutrients therein, so that the H in the biogas 2 S is oxidized to generate S and further oxidized to generate S 2 O 3 2- 、SO 4 2- etc., thereby achieving the removal of H 2The purpose of S is to use a biological desulfurization tower to remove H 2 The S concentration is reduced from 2500ppm to 200ppm, and the biogas treated by the biological desulfurization tower is subjected to dry desulfurization by the dry desulfurization device. The dry desulfurization is to fill a certain height of desulfurization agent in the desulfurization equipment, and the biogas after the biological desulfurization tower passes through the desulfurization agent from bottom to top, H 2 S is removed to achieve the desulfurization process, in which the desulfurizer uses iron oxide as the main active catalytic component, and adds a variety of co-catalysts and carriers to remove H through catalytic action at normal temperature and pressure. 2 S, the desulfurization rate can reach more than 90%, and the H in the biogas after biological desulfurization can be 2 S further dropped to below 7.5ppm. It should be noted that those skilled in the art can select the biological filler layer and the desulfurization bacteria group according to actual needs, as long as the above-mentioned desulfurization function can be achieved. The dry desulfurization continuous regeneration process has the characteristics of high sulfur capacity, small bed resistance, convenient operation, continuous regeneration, and simple regeneration process. The principle of the desulfurization regeneration process is as follows:

[0128] Desulfurization: Fe 2 O 3 ·H 2 O+3H 2 S=Fe 2 S 3 ·H 2 O+3H 2 O

[0129] Regeneration: 2Fe 2 S 3 ·H 2 O+3O 2 =2Fe 2 O 3 ·H 2 O+6S

[0130] Combining the above two reaction equations, the desulfurization regeneration reaction equation is as follows: 2 S+1 / 2O 2 =S+H 2 O (reaction conditions are Fe 2 O 3 ·H 2 O). It should be noted that those skilled in the art can select the biological filler layer and the desulfurization bacteria group according to actual needs, as long as the above-mentioned desulfurization function can be achieved.

[0131] S600: Desulfurized biogas is supplied to the biogas purification unit

[0132] In this step, the desulfurized biogas obtained in step S500 is supplied to the biogas purification device for purification so as to obtain vehicle fuel gas. Specifically, the biogas purification device 600 is a membrane purification device. The desulfurized biogas obtained above is first pre-treated to remove particulate matter, moisture, oil and other substances in the biogas, and then the gas is heated to a temperature of 2 to 3 KPa, and then the gas is heated to a temperature of 50 °C, and then the gas is heated to a temperature of 100 °C. 4 55~65vol%;CO 2 35~45vol%;H 2 S<7.5mg / Nm 3 ;H 2 O50%~100%RH; Note: The standard reference conditions for gas volume in this standard are 101.325kPa, 20℃) and then supplied to the membrane purification equipment. The membrane assembly performs rough and fine decarbonization on the biogas. After membrane purification, CH 4 The purity of the natural gas product is higher than 97%. The membrane module can also remove the moisture in the biogas, so that the dew point of the biogas can fully meet the dew point requirements of vehicle fuel gas. The waste gas separated by membrane purification can be discharged directly, or CO 2 After recycling, biogas with a purity higher than 97% enters the CNG compressor system, and the pressure is increased to 25MPa by the compressor to meet the pressure standard of vehicle gas, and then added to the skid-mounted vehicle through the gas filling column, which can be sold or transported to surrounding gas filling stations for use. The membrane assembly is the core of the entire membrane purification equipment. After the carbon dioxide passes through the secondary hollow fiber membrane group, it meets the design output requirements. The external exhaust of the system is discharged in the primary membrane group and becomes exhaust gas. After passing through the secondary membrane group, the exhaust gas of the secondary membrane group returns to the pressure stabilizing buffer tank through reflux to complete the closed cycle. The working principle of the hollow fiber membrane is to separate different gas molecules through the different permeation rates of different gases in the hollow fiber membrane of the polymer material. Among them, the gas with a fast permeation rate is called "fast gas" and the gas with a slow permeation rate is called "slow gas". Because of its fast permeation, most of the "fast gas" is enriched at the inlet end, and a small part penetrates to the exhaust end; because of its slow permeation, most of the "slow gas" penetrates the membrane group to the exhaust end, and a small part is enriched at the inlet end. Water, hydrogen sulfide, carbon dioxide and oxygen in biogas are all "fast gases", while nitrogen and methane are "slow gases". Therefore, the selective permeation adsorption characteristics of the membrane module determine that membrane biogas purification can not only remove a large amount of carbon dioxide, but also remove some hydrogen sulfide and oxygen impurities.

[0133] Further, refer to Fig.11 The above-mentioned method for collaboratively processing kitchen waste and restaurant waste also includes:

[0134] S700: Supply anaerobic digestion liquid to the solid-liquid separation device for solid-liquid separation

[0135] In this step, the anaerobic digestion liquid obtained in the above step S400 is supplied to a solid-liquid separation device for solid-liquid separation, so as to obtain biogas residue and biogas liquid. Specifically, the solid-liquid separation device 700 is a two-phase horizontal screw centrifuge. The anaerobic digestion liquid produced by the dry anaerobic fermentation device 400 is pumped to the two-phase horizontal screw centrifuge. The two-phase horizontal screw centrifuge utilizes the density difference between the solid and liquid phases. Under the action of the centrifuge, the sedimentation rate of the solid phase particles is accelerated to achieve solid-liquid separation. The separation process is that the anaerobic digestion liquid after adding a flocculant (for example, the flocculant is PAM or iron salt) is sent to the mixing chamber in the drum of the two-phase horizontal screw centrifuge through an inlet pipe. Due to the high-speed rotation and friction of the rotor, Resistance, anaerobic digestion liquid is accelerated in the rotor and forms a cylindrical liquid ring layer. Under the action of centrifugal force, solid particles with larger specific gravity settle to the inner wall of the drum to form a mud layer, and then the relative speed difference between the spiral and the drum is used to push the solid phase to the conical end of the drum. After being pushed out of the liquid surface, the mud residue is dehydrated and dried, and pushed to the slag discharge port for discharge. The supernatant is discharged from the large end of the drum to achieve solid-liquid separation. The biogas residue containing 80% water produced after solid-liquid separation is sent to the incineration plant for incineration, and the produced biogas liquid is pumped to the subsequent step S800 for treatment.

[0136] S800: Feeding biogas slurry to sewage treatment plant

[0137] In this step, the biogas slurry is supplied to a sewage treatment device for purification to achieve the discharge of wastewater in compliance with standards. It should be noted that those skilled in the art can select the specific operation of the purification process according to actual needs, as long as the discharge of biogas slurry in compliance with standards can be achieved, and no further details will be given here.

[0138] Further, refer to Fig.12 The above-mentioned method for collaboratively processing kitchen waste and restaurant waste also includes:

[0139] S900: supplying another part of the biogas to the biogas boiler for combustion and then exchanging heat with cooling water, and supplying steam to step S240

[0140] In this step, another part of the biogas obtained by the total dry anaerobic fermentation device in step S400 is supplied to the biogas boiler for combustion and then heat exchange with cooling water to obtain heat exchange flue gas and steam, and the steam is supplied to the cooking device 23 in step S230 as a heat source for heating the organic slurry.

[0141] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0142] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A system for collaboratively processing kitchen waste and restaurant waste, characterized in that: include: A kitchen waste pretreatment unit, the kitchen waste pretreatment unit having a kitchen waste inlet, a first leachate outlet, a first inorganic impurity outlet and a crushed kitchen waste outlet; A catering waste pretreatment unit, the catering waste pretreatment unit having a catering waste inlet, a second inorganic impurity outlet, a third inorganic impurity outlet, a second leachate outlet, a grease outlet, a wastewater outlet and a catering waste slurry outlet; A mixing device, the mixing device having a crushed kitchen waste inlet, a restaurant waste slurry inlet and a mixed organic slurry outlet, the crushed kitchen waste inlet is connected to the crushed kitchen waste outlet, the restaurant waste slurry inlet is connected to the restaurant waste slurry outlet, and is used to mix the crushed kitchen waste obtained by the kitchen waste pretreatment unit and the restaurant waste slurry obtained by the restaurant waste pretreatment unit, and the mass ratio of the crushed kitchen waste to the restaurant waste slurry is greater than or equal to 1.53; A dry anaerobic fermentation device, wherein the dry anaerobic fermentation device has a mixed organic slurry inlet, a biogas outlet and an anaerobic digestion liquid outlet, and the mixed organic slurry inlet is connected to the mixed organic slurry outlet via a scraper conveyor; A biogas purification device, wherein a biological filler layer is provided in the biogas purification device, and the biogas purification device has a first biogas inlet and a desulfurized biogas outlet, wherein the first biogas inlet is connected to the biogas outlet; The kitchen waste pretreatment unit comprises: A garbage storage pit, wherein the garbage storage pit has the kitchen waste inlet, the first leachate outlet and a heap filter material outlet; a drum screen, wherein the drum screen has a heap filter material inlet, the first inorganic impurity outlet and an organic waste outlet, and the heap filter material inlet is connected to the heap filter material outlet; A magnetic separator, the magnetic separator having an organic waste inlet, a metal outlet and a waste outlet after magnetic separation, the organic waste inlet being connected to the organic waste outlet; A shearing crusher, wherein the shearing crusher has a magnetically separated garbage inlet and a crushed kitchen waste outlet, wherein the magnetically separated garbage inlet is connected to the magnetically separated garbage outlet; The restaurant waste pretreatment unit comprises: An impurity separator, the impurity separator having the restaurant waste inlet, the second inorganic impurity outlet, the second leachate outlet and the separated material outlet; A crushing and sorting pulping machine, wherein the crushing and sorting pulping machine has a separated material inlet, a water inlet, a third inorganic impurity inlet and an organic pulp outlet, wherein the separated material inlet is connected to the separated material outlet, and the water inlet is connected to the first leachate outlet and the second leachate outlet; A cooking device, wherein the cooking device has an organic slurry inlet and a cooked material outlet, and the organic slurry inlet is connected to the organic slurry outlet; A three-phase separator, the three-phase separator has a cooking material inlet, the grease outlet, the wastewater outlet and the catering waste slurry outlet, the cooking material inlet is connected to the cooking material outlet, and the wastewater outlet is connected to the water inlet.

2. The system according to claim 1, characterized in that Further including: A biogas purification device is provided, wherein the biogas purification device is provided with a desulfurized biogas inlet and a vehicle fuel gas outlet, wherein the desulfurized biogas inlet is connected to the desulfurized biogas outlet.

3. The system according to claim 1, characterized in that Further including: A solid-liquid separation device, the solid-liquid separation device having an anaerobic digestion liquid inlet, a biogas residue outlet and a biogas liquid outlet, the anaerobic digestion liquid inlet is connected to the anaerobic digestion liquid outlet; A sewage treatment device is provided, wherein the sewage treatment device is provided with a biogas slurry inlet and a qualified water outlet, wherein the biogas slurry inlet is connected to the biogas slurry outlet.

4. The system according to claim 1, characterized in that Further including: A biogas boiler is provided, wherein the biogas boiler has a second biogas inlet, a cooling water inlet, a heat exchange flue gas outlet and a steam outlet, wherein the second biogas inlet is connected to the biogas outlet, and the steam outlet is connected to the cooking device.

5. A method for collaboratively processing kitchen waste and restaurant waste using the system according to any one of claims 1 to 4, characterized in that: include: (1) supplying the kitchen waste to the kitchen waste pretreatment unit for pretreatment to obtain a first leachate, first inorganic impurities and crushed kitchen waste; (2) supplying the restaurant waste to the restaurant waste pretreatment unit for pretreatment to obtain second inorganic impurities, third inorganic impurities, second leachate, grease, wastewater and restaurant waste slurry; (3) supplying the crushed kitchen waste and the restaurant waste slurry to the mixing device for mixing, so as to obtain a mixed organic slurry; (4) The mixed organic slurry is supplied to the dry anaerobic fermentation device for anaerobic fermentation treatment to obtain biogas and anaerobic digestate.

6. The method according to claim 5, characterized in that Step (1) is as follows: (1-1) supplying the kitchen waste to a waste storage pit for heap filtration to obtain a first leachate and a heap filtration material; (1-2) supplying the heap filtered material to a drum screen for screening to obtain first inorganic impurities and organic waste; (1-3) supplying the organic waste to a magnetic separator for magnetic separation to obtain metal and magnetically separated waste; (1-4) The magnetically separated garbage is supplied to a shearing crusher for shearing and crushing, so as to obtain the crushed kitchen waste.

7. The method according to claim 5 or 6, characterized in that: Step (2) is performed as follows: (2-1) supplying the restaurant waste to an impurity separator for separation, so as to obtain the second inorganic impurities and a separated material; (2-2) supplying the separated material, the first leachate and the second leachate to a crushing and sorting pulping machine for crushing and sorting and then pulping to obtain the third inorganic impurities and organic pulp; (2-3) supplying the organic slurry to a cooking device for cooking to obtain a cooked material; (2-4) The cooked material is supplied to a three-phase separator for separation to obtain the oil, the wastewater and the catering waste slurry, and a portion of the wastewater is supplied to the crushing and sorting pulping machine in step (2-2).

8. The method according to claim 5, characterized in that Further including: (5) supplying a portion of the biogas to a biogas purification device containing a biological filler layer to obtain desulfurized biogas; (6) The desulfurized biogas is supplied to a biogas purification device to obtain vehicle fuel gas.

9. The method according to claim 5, characterized in that Further including: (7) supplying the anaerobic digestion liquid to a solid-liquid separation device for solid-liquid separation to obtain biogas residue and biogas liquid; (8) The biogas slurry is supplied to a sewage treatment plant for treatment and then discharged in compliance with discharge standards.

10. The method according to claim 7, characterized in that Further including: (9) Another part of the biogas is supplied to a biogas boiler for combustion and then heat exchange with cooling water to obtain heat exchange flue gas and steam, and the steam is supplied to the cooking device in step (2-4).

Images