Kitchen garbage aerobic fermentation treatment method and system

Abstract

The invention provides a kitchen waste aerobic fermentation treatment method and system. The treatment method comprises the following steps: (1) kitchen waste pretreatment; (2) primary aerobic fermentation: conveying the pretreated kitchen waste organic solid residues into primary biochemical treatment equipment, mixing the kitchen waste organic solid residues with a kitchen waste aerobic fermentation inoculant, and carrying out aerobic fermentation to obtain a primary fermented kitchen waste organic material; (3) secondary aerobic fermentation and decomposition: supplying oxygen to the primary fermentation kitchen garbage organic material through hot air, and performing secondary aerobic fermentation and decomposition to obtain a secondary fermentation organic matter raw material with the water content of 42-48%; and (4) drying. Solid organic matters in the kitchen garbage are biochemically converted into an organic fertilizer raw material with high humification index and decomposition degree through aerobic fermentation, the organic fertilizer raw material can also be used as a soil conditioner and a crude organic fertilizer, and the time required by the method can be shortened to 1 / 3-1 / 5 of the original time compared with the time required by a traditional aerobic composting process.

Description

Technical Field

[0001] The invention relates to the technical field of aerobic fermentation of organic waste, and in particular to an aerobic fermentation treatment method and system for kitchen waste. Background Art

[0002] According to the national standard "Classification Mark of Domestic Waste GB / T19095-2019", food waste is defined as: "Indicates perishable domestic waste containing organic matter, including household kitchen waste, restaurant kitchen waste and other kitchen waste, etc." That is, "kitchen waste" includes perishable organic waste such as fruits and vegetables and food scraps, leftovers, melon and fruit peels discarded in daily family life, as well as perishable organic waste dominated by fruits and vegetables discarded from farmers' fruit and vegetable markets, with a water content of about 70%. In addition, catering waste (leftovers from restaurants, hotels, unit canteens, etc., and waste from food processing in the back kitchen) has a water content of 85% or more (solid content is generally below 15%), which is higher than household kitchen waste in terms of water content and oil content.

[0003] At present, my country's kitchen waste treatment capacity is still seriously insufficient, accounting for only 19.5%, of which the anaerobic route accounts for 76.1%. Most kitchen waste treatment projects adopt anaerobic technology routes, and aerobic fermentation also occupies part of the market. Among them, aerobic fermentation technology shows strong applicability for decentralized application scenarios that are not suitable for centralized treatment. For example, it can be used in government agencies, schools, large commercial complexes, office buildings, star-rated hotels, farmers' markets, communities and other catering, kitchen waste and other perishable waste concentrated production points, as well as rural areas, remote areas, highway service areas, warships, offshore cruise ships and oil well drilling platforms and other independent production units. In addition, compared with anaerobic technology, aerobic fermentation technology also has the advantages of small footprint, small investment scale and relatively flexible site selection for a single project.

[0004] Aerobic fermentation technology is mainly based on the ancient composting technology principle. Through the life activities of microorganisms themselves, organic waste is oxidized into simple inorganic substances, while releasing energy required for microbial growth activities and synthesizing new cytoplasm. The result of aerobic fermentation is to convert kitchen waste into humus and organic fertilizer with a high degree of stabilization, thereby achieving harmlessness and reduction.

[0005] The humification index, seed germination rate, seed germination index and degree of maturity of fertilizer products obtained by many aerobic fermentation methods and equipment in the prior art are mostly unqualified. The application of such products to farmland will not only seriously affect the soil quality and hinder the normal growth of plants, but also have a serious risk of secondary pollution. Therefore, it is far from meeting the parameter requirements of organic fertilizers. Summary of the invention

[0006] The present invention provides a method and system for aerobic fermentation treatment of kitchen waste, the method comprising two aerobic fermentation steps, thereby finally obtaining an organic fertilizer product with a high humification index and maturity. The system can implement the method.

[0007] The present invention provides an aerobic fermentation method for treating kitchen waste, which comprises the following steps:

[0008] (1) kitchen waste pretreatment step: removing plastic, metal, glass and non-perishable organic components in the kitchen waste, and then crushing and dehydrating the kitchen waste to obtain pretreated kitchen waste organic solid residue with a moisture content of less than 65% consisting of water, grease and perishable organic components;

[0009] (2) a primary aerobic fermentation step: transporting the pretreated organic solid residue from the kitchen waste to a primary biochemical treatment device, mixing it with an aerobic fermentation agent for kitchen waste, and performing aerobic fermentation to obtain a primary fermented organic material from the kitchen waste;

[0010] (3) Secondary aerobic fermentation and maturation step: the primary fermented kitchen waste organic material is subjected to secondary aerobic fermentation and maturation by supplying oxygen through hot air, thereby obtaining a secondary fermented organic material having a moisture content of 42-48%;

[0011] (4) Drying step: drying the secondary fermented organic raw material to obtain an organic fertilizer raw material made from kitchen waste.

[0012] Furthermore, the auxiliary material matrix is ​​one or more of sawdust, garden waste, dry sludge, chopped straw, and dry feces.

[0013] Furthermore, in the step (4), a screening step is also included after drying, and undegraded large particle impurities are further removed by screening.

[0014] Furthermore, the aerobic fermentation agent for kitchen waste is Bacillus licheniformis RJ-TD01, which is classified and named Bacillus licheniformis RJ-TD01. It was deposited in the General Microbiological Collection Center of the Microbiological Culture Collection Management Committee on May 12, 2023, with a deposit number of CGMCC NO.27320, and the deposit address is No. 3, Yard 1, Beichen West Road, Chaoyang District, Beijing.

[0015] Furthermore, in the step (2), the primary biochemical treatment equipment needs to carry out a pre-culture of the bacterial bed matrix and add the aerobic fermentation agent of the kitchen waste before feeding.

[0016] The present invention provides an aerobic fermentation treatment system for kitchen waste that can implement the above-mentioned treatment method, characterized by comprising:

[0017] (1) a kitchen waste pretreatment device, the kitchen waste pretreatment device comprising a collecting bin, a sorting machine, a crusher, and a dehydrator connected in sequence, through which the organic solid residue of the pretreated kitchen waste can be obtained;

[0018] (2) a primary aerobic fermentation device, the primary aerobic fermentation device comprising a spice bin, a material distribution screw conveyor, and a primary aerobic biochemical treatment machine connected in sequence, the spice bin being provided with a stirrer, which can be used to evenly stir the auxiliary material matrix after adding it into the spice bin, the material distribution screw conveyor can convey the organic solid residue of kitchen waste in the spice bin to the primary aerobic biochemical treatment machine, the primary aerobic biochemical treatment machine is suitable for stirring the organic solid residue of kitchen waste and aerobic fermentation bacteria during aerobic fermentation, supplying oxygen to the interior of the pile body in synchronization with the stirring, heating the interior of the pile body with hot air, controlling the temperature, and controlling the moisture content;

[0019] (3) A secondary aerobic fermentation and composting device, the secondary aerobic fermentation and composting device comprising a secondary fermentation chamber and a hot air supply component, the secondary fermentation chamber being suitable for receiving the primary fermented kitchen waste delivered by the primary aerobic biochemical treatment machine, the secondary fermentation chamber being arranged as a vertical silo, a plurality of silo plates being vertically spaced apart in the silo to form a plurality of chambers, each of the chambers having a flipping and pushing rod with an air supply hole that can rotate radially around the center of the silo to supply hot air and slowly flip the material to the drop opening of each silo plate and drop it into the next silo plate, The primary fermented kitchen waste is continuously pushed by the pushing rods at each layer, and falls from top to bottom layer by layer to the bottom discharge port; each layer of the silo is provided with a sampling device to detect the fermentation status as a basis for adjusting the hot air supply and the pushing operation; the hot air supply component is suitable for supplying hot air to each chamber of the secondary fermentation chamber, and each chamber controls oxygen, temperature and humidity to meet the environmental conditions and time and space conditions required for deep decomposition in the middle and late stages of aerobic biochemistry in each chamber, and obtains secondary fermented kitchen waste organic materials with a moisture content of 42-48%;

[0020] (4) A drying device, which can dry the secondary fermented organic raw material to further reduce the moisture content.

[0021] Furthermore, the hot air supply assembly includes a plurality of heating air ducts, an air heater and a high-pressure fan, one end of the plurality of heating air ducts is connected to the plurality of chambers, and the other end is connected to the air outlet of the air heater; the high-pressure fan is connected to the air inlet of the air heater to supply cold air to the air heater for heating and then supply it into the plurality of heating air ducts.

[0022] Furthermore, it also includes a solenoid valve group and a controller, wherein the several solenoid valves of the solenoid valve group are arranged on the several heating air ducts in a one-to-one correspondence; the controller is connected to the solenoid valve group to control the ventilation and closing of each of the heating air ducts.

[0023] Furthermore, it also includes (5) a screening device, wherein the vibrating screen of the screening device has a mesh size of 7.

[0024] Compared with the aerobic fermentation technology of kitchen waste in the prior art, the present invention has the following beneficial effects:

[0025] The present invention allows the solid organic matter in the kitchen waste to be rapidly converted into an organic fertilizer raw material with a high humification index and maturity through aerobic fermentation (it can also be directly used as a soil conditioner and crude organic fertilizer). After further processing of the fertilizer, it can be made into a variety of higher quality organic fertilizers such as compound fertilizers and microbial fertilizers for sale or use.

[0026] The post-screening device at the end of the process line in the present invention overcomes the pain points of kitchen waste being oily, sticky and difficult to remove impurities, and fully utilizes the characteristics that organic matter after fermentation and degradation and non-degradable substances do not stick to each other, thereby achieving efficient impurity removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a process for aerobic fermentation treatment of kitchen waste according to an embodiment of the present invention;

[0028] Figure 2 is a layout diagram of a kitchen waste aerobic fermentation treatment system according to an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of a secondary aerobic fermentation and composting device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] 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.

[0031] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0032] In the following examples, EM composting bacteria were sourced from Shandong Junde Biotechnology Co., Ltd.

[0033] The degradation rate of kitchen waste is calculated using the following formula: weight loss rate = (AB) / C×100%; A: the total weight of kitchen waste and bacterial agent after input; B: the total weight of kitchen waste and bacterial agent after treatment; C: the total weight of the input kitchen waste.

[0034] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] Example 1 Preparation of bacterial agent

[0036] Slant culture: The lichen spore strain RJ-TD01 was inoculated on a slant of beef extract + tryptone agar medium and cultured at 37°C for 24 hours for activation.

[0037] Seed liquid culture: The activated strain RJ-TD01 was inoculated into beef extract + tryptone liquid culture medium, and cultured at 37°C, 200 rpm shaking on a shaker for 24 hours to prepare the seed liquid.

[0038] Spore fermentation culture: The seed liquid was inoculated into spore fermentation medium (milk powder 5g / L, beef extract 3g / L, corn steep liquor 40g / L, NaCl 5g / L, water 1000ml, pH adjusted to 7.0), and cultured at 37°C, 200rpm shaking table for 48h to obtain spore fermentation liquid, in which the spore concentration was 9×10 9 cfu / mL.

[0039] The corn flour is heated at 70° C. for 1 h to kill harmful pathogenic bacteria, thereby obtaining a carrier.

[0040] The spore fermentation liquid was diluted and sprayed with the carrier for stirring and mixing, wherein the ratio of the volume (L) of the spore fermentation liquid to the mass (kg) of the carrier was 1:2, and the mixture was kept at 45°C for 4 hours. Finally, the moisture content of the inoculum was controlled between 30% and 40%, and the total effective viable count of the inoculum was 1.9×10 8 ~3.5×10 8 cfu / g.

[0041] Example 2 Degradation of kitchen waste

[0042] Several tons of kitchen waste are passed through a collection bin, a sorting machine and a crusher connected in sequence in a kitchen waste pretreatment device to remove non-perishable organic components such as plastic, metal, and glass in the kitchen waste, so as to obtain pretreated kitchen waste composed of water, oil and perishable organic components.

[0043] The pretreated kitchen waste is dehydrated to adjust its moisture content to below 65% to obtain organic solid residue from the kitchen waste.

[0044] The organic solid residue of kitchen waste is transported to the primary aerobic fermentation device through the material separation screw for primary aerobic fermentation:

[0045] The organic solid residue of kitchen waste and the auxiliary material matrix are conveyed to the seasoning bin through a material dividing screw. A stirrer is provided in the seasoning bin to stir them evenly. Then, the organic solid residue of kitchen waste and the microbial agent (the agent of Example 1, and a control experiment is also provided, and the control experiment is commercially available EM composting bacteria) in the seasoning bin are conveyed to the primary aerobic biochemical treatment machine through the material dividing screw conveyor. The organic solid residue of kitchen waste is stirred by the horizontal double-shaft stirrer, aerobic aeration structure, hot air supply, pile body temperature detector, and material moisture content detector provided in the primary aerobic biochemical treatment machine, and the internal oxygen supply of the pile body that moves synchronously with the stirring, the internal hot air heating of the pile body, the temperature control, and the moisture content control are performed. The primary aerobic biochemical treatment machine is an RJ-SCJ-500 type organic waste biochemical treatment machine. The specific structure of the equipment is detailed in the organic waste biochemical treatment equipment provided by Chinese utility model patent CN 220092501 U, which will not be described in detail here. The primary aerobic biochemical treatment machine provides the microbial strains with the best living environment and biochemical conditions such as temperature, oxygen, and humidity, so that macromolecular substances are decomposed into low molecular substances that can be used by microorganisms, and then a fermentation biochemical degradation is carried out. After about 24-48 hours, it becomes a non-toxic, harmless, and odorless residue (primary fermented kitchen waste organic material).

[0046] The organic materials of the primary fermented kitchen waste are transported to the secondary aerobic fermentation and ripening device through a screw conveyor (reference Figure 3 ) for further fermentation and maturation, the secondary aerobic fermentation and maturation device includes a secondary fermentation chamber and a hot air supply component, the secondary fermentation chamber is suitable for receiving the primary fermented kitchen waste delivered by the primary aerobic biochemical treatment machine, the secondary fermentation chamber is arranged as a vertical silo, a plurality of silo plates are vertically spaced in the silo to form a plurality of chambers, each chamber has a plurality of flipping and pushing rods with air supply holes which can rotate radially around the center of the silo to slowly flip and push the material to the dropout opening of each silo plate and fall into the next silo plate, the primary fermented kitchen waste is continuously flipped and pushed by the flipping and pushing rods on each layer, and falls from top to bottom step by step to the bottom discharge opening; the hot air supply component is suitable for supplying hot air to each chamber of the secondary fermentation chamber, each chamber controls oxygen, temperature and humidity to meet the environmental conditions required for deep maturation of each chamber in the middle and late stages of aerobic biochemistry, and obtains secondary fermented organic raw materials with a moisture content of less than 30%.

[0047] The hot air supply assembly includes a number of heating air ducts, an air heater and a high-pressure fan. One end of the heating air ducts is connected to a number of chambers, and the other end is connected to the air outlet of the air heater. The high-pressure fan is connected to the air inlet of the air heater to supply cold air to the air heater for heating and then supplying it to the number of heating air ducts. It also includes a solenoid valve group and a controller. The solenoid valves of the solenoid valve group are arranged on the number of heating air ducts one by one. The controller is connected to the solenoid valve group to control the ventilation and closing of each heating air duct (the hot air supply assembly refers to the hot air oxygen supply structure in the Chinese utility model patent CN 220092501 U).

[0048] After the secondary aerobic fermentation, the material reaches the drying requirement (water content is 15-30% according to the downstream order requirements), and then enters the screening machine. The crude fertilizer produced after drying and composting still contains a small amount of impurities such as plastic. The vibrating screen is selected with a mesh of 7. The impurities on the screen are sent to the incineration plant for incineration, and the impurities under the screen are high-quality organic fertilizer raw materials with a pore size of less than 2.8mm.

[0049] In this embodiment, before the aerobic fermentation, the culture and debugging of the bacterial bed matrix of the biochemical machine are first carried out. Specifically, on December 3, 2023, 200 kg of matrix (sawdust) was added as the bacterial bed, a small amount of water was sprayed to moisten the matrix, and 100 kg of kitchen waste was added. The machine was started and 2 kg of RJ-TD01 bacterial agent was evenly added; on December 4, 2023, 200 kg of kitchen waste was added and 2 kg of RJ-TD01 bacterial agent was evenly added; on December 5, 2023, 100 kg of kitchen waste was added, and no more bacterial agent was added.

[0050] The debugging operation process of the culture of the substrate of the primary biochemical machine is as follows: the first substrate (200kg of sawdust) is put into the engine room of the primary biochemical machine, the stirring motor of the primary biochemical machine is started, the sprayer of the primary biochemical machine is adjusted to spray a small amount of water to wet the substrate and 2kg of RJ-TD01 bacterial agent is evenly sprinkled, 100kg of the kitchen waste to be processed is pre-treated (i.e., it is lifted to a sorting platform by a lifting device, and impurities that are not easy to degrade, such as cloth strips and glass bottles, are picked out by manual sorting, and the biodegradable kitchen waste is sent to a crusher and a spiral extruder to remove excess moisture), and the obtained kitchen waste organic materials with moisture content <65%, particle size <30mm, and pH value range of 5.5-8.5 are transported and put into the engine room of the primary biochemical machine; the heating and ventilation equipment are started, and the relevant parameters of each equipment are set / adjusted (the engine room heating temperature is 50±5°C, and the engine room ventilation maintains the oxygen content O2≥15-20%), and then the primary biochemical machine continues to operate continuously. On the second day, 200 kg of kitchen waste was pretreated in the same manner as above and then put into the biochemical machine cabin once, and 2 kg of RJ-TD01 bacteria were evenly sprinkled to complete the second batch of feeding. On the third day, 100 kg of kitchen waste was pretreated in the same manner as above and then put into the biochemical machine cabin once (without spreading bacteria) to complete the third batch of feeding.

[0051] The debugging and operation records of the mushroom bed matrix are as follows in Table 1:

[0052] Table 1 Fungal bed matrix debugging operation record

[0053]

[0054] In this embodiment, the aerobic biochemical process is as follows: after the cultivation of the matrix of the biochemical machine bed is completed, the kitchen waste to be processed is pre-treated in the aforementioned manner in three batches and then put into an aerobic biochemical equipment to conduct an aerobic biochemical experiment. Each batch of kitchen waste is 500 kg, totaling 1500 kg. On December 6, 2023, 500 kg of kitchen waste was put in, and 2 kg of RJ-TD01 strains were evenly put in. The initial temperature of the material was 9 ° C, and the peak reached 57 ° C; on December 7, 2023, 500 kg of kitchen waste was put in, and 2 kg of RJ-TD01 strains were evenly sprinkled in. The initial temperature of the material was 9 ° C, and the peak reached 58 ° C; on December 8, 2023, 500 kg of kitchen waste was put in, and 2 kg of RJ-TD01 strains were evenly sprinkled in. The initial temperature of the material was 9 ° C, and the peak reached 64 ° C.

[0055] After the materials enter the biochemical chamber of the primary biochemical machine, they are mixed with the high-efficiency microbial strains in the matrix of the biochemical chamber. The primary biochemical machine provides the microbial strains with the best living environment and biochemical conditions such as temperature, oxygen, and humidity for 24-48 hours to carry out biochemical degradation, decomposing macromolecules into small molecules, turning them into non-toxic, harmless, and odorless materials, and then transporting them to the secondary aerobic biochemical system.

[0056] Table 2. Operation record of an aerobic biochemical test

[0057]

[0058] Secondary aerobic biochemical composting process: After 24-48 hours of biochemical degradation in the primary biochemical machine, the bacteria reproduce rapidly (accompanied by the rise in material temperature) to decompose large molecules into small molecules, turning them into non-toxic, harmless, and odorless materials, which are then transported to the secondary aerobic biochemical system for 15-20 days of operation for further deep composting.

[0059] The secondary biochemical equipment machinery used in this embodiment adjusts the operating parameters according to the characteristics of the aerobic biochemical degradation process, starts the secondary biochemical warehouse equipment system, puts it into automatic control, the agitator rotates intermittently (rotates for 10 minutes / stops for 20 minutes), the air volume (hot air) when the agitator blades rotate is greater than when they stop (maintaining the lowest local temperature>35°C, oxygen content O2≥15-20%), the induced draft fan and the blower are interlocked, and the ventilation is reduced and the heating amount is reduced synchronously. As the equipment runs, the organic matter in the warehouse gradually completes its secondary fermentation while slowly rolling down from the inlet to the outlet, reaching the qualified indicators.

[0060] The running record of the secondary fermentation aerobic biochemical experiment is shown in Table 3.

[0061] Table 3 Secondary aerobic biochemical composting test operation record

[0062]

[0063]

[0064] The fertilizer obtained after secondary aerobic biochemical decomposition was commissioned to the Nangong Park Operation and Management Branch of Beijing Environmental Sanitation Engineering Group Co., Ltd. for testing. The organic raw materials produced in this experiment were tested for organic matter, nitrogen, phosphorus, potassium and other indicators that met the organic fertilizer standards of the Ministry of Agriculture and Rural Affairs, and heavy metals and E. coli were within a safe range. The discharge on the 21st day (68kg of impurities and 90kg of organic matter) totaled 158kg, with a degradation rate of 89.5%.

[0065] On the 21st day, the control group discharged a total of 375 kg (263 kg of impurities and 112 kg of organic matter), with a degradation rate of 75%.

[0066] The effective volume of the primary aerobic biochemical treatment machine in this embodiment is as high as , which can provide the most favorable place for microbial biochemical reactions. It has a horizontal double-axis stirring function. The unique stirring blade design enables the material to be fully stirred, forming cross-flow contact with the airflow, increasing the oxygen supply area of ​​the microorganisms and promoting the biochemical rate. In addition, according to the biochemical habits of microorganisms, an intermittent operation and forward and reverse alternating working mode is adopted to create a more superior biochemical environment for the microorganisms.

[0067] In this embodiment, the microbial strains are provided with an optimal living environment and fermentation conditions such as temperature, oxygen, and humidity, so that the macromolecular substances are decomposed into low molecular substances that can be used by microorganisms, and then biochemically degraded. After about 24-48 hours, they become non-toxic, harmless, and odorless residues with a moisture content of about 65%. The automatic conveying device is turned on to discharge the material, and the material is sent to the secondary aerobic fermentation and maturation device through a shaftless screw for deep maturation, so as to further improve the humification index and maturity of the material.

[0068] In this embodiment, oxygen is continuously supplied to the material through a high-pressure air supply system for secondary aerobic fermentation and maturation. Under the action of aerobic microbial agents, the difficult-to-degrade materials in the primary aerobic fermentation continue to decompose, generating a large amount of high temperature, promoting the evaporation of water in the material, and achieving the treatment purposes of harmlessness, reduction and stabilization; the fermented material can be used as raw material for organic fertilizer and landscaping, realizing resource utilization.

[0069] The above embodiments are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in the field should fall within the protection scope of the present invention.

Claims

1. A method for aerobic fermentation treatment of kitchen waste, characterized in that The following steps are involved: (1) kitchen waste pretreatment step: removing plastic, metal, glass and non-perishable organic components in the kitchen waste, and then crushing and dehydrating the kitchen waste to obtain pretreated kitchen waste organic solid residue with a moisture content of less than 65% consisting of water, oil and perishable organic components; (2) a primary aerobic fermentation step: transporting the pretreated organic solid residue from the kitchen waste to a primary biochemical treatment device, mixing it with an aerobic fermentation agent for kitchen waste, and performing aerobic fermentation to obtain a primary fermented organic material from the kitchen waste; (3) Secondary aerobic fermentation and maturation step: the primary fermented kitchen waste organic material is subjected to secondary aerobic fermentation and maturation by supplying oxygen through hot air, thereby obtaining a secondary fermented organic material having a moisture content of 42-48%; (4) Drying step: drying the secondary fermented organic raw material to obtain an organic fertilizer raw material made from kitchen waste.

2. The method for aerobic fermentation treatment of kitchen waste according to claim 1, characterized in that: The auxiliary material matrix is ​​one or more of wood chips, garden waste, dry sludge, chopped straw and dry feces.

3. The method for aerobic fermentation treatment of kitchen waste according to claim 1, characterized in that: In the step (4), a screening step is also included after drying, and the undegraded large particle impurities are further removed by the screening process.

4. The method for aerobic fermentation treatment of kitchen waste according to claim 1, characterized in that: The aerobic fermentation agent for kitchen waste is Bacillus licheniformis RJ-TD01, which is classified and named Bacillus licheniformis RJ-TD 01. It was deposited in the General Microbiological Collection Center of the Microbiological Culture Collection Management Committee on May 12, 2023, with a deposit number of CGMCC NO.27320, and the deposit address is No. 3, Yard 1, Beichen West Road, Chaoyang District, Beijing.

5. The method for aerobic fermentation treatment of kitchen waste according to claim 1, characterized in that: In the step (2), the primary biochemical treatment equipment needs to carry out bacterial bed matrix culture and add the kitchen waste aerobic fermentation bacteria agent before feeding.

6. A kitchen waste aerobic fermentation treatment system capable of executing the treatment method according to any one of claims 1 to 5, characterized in that include: (1) a kitchen waste pretreatment device, the kitchen waste pretreatment device comprising a collecting bin, a sorting machine, a crusher, and a dehydrator connected in sequence, through which the organic solid residue of the pretreated kitchen waste can be obtained; (2) a primary aerobic fermentation device, the primary aerobic fermentation device comprising a spice bin, a material distribution screw conveyor, and a primary aerobic biochemical treatment machine connected in sequence, the spice bin being provided with a stirrer, which can be used to evenly stir the auxiliary material matrix after adding it into the spice bin, the material distribution screw conveyor can convey the organic solid residue of kitchen waste in the spice bin to the primary aerobic biochemical treatment machine, the primary aerobic biochemical treatment machine is suitable for stirring the organic solid residue of kitchen waste and aerobic fermentation bacteria during aerobic fermentation, supplying oxygen to the interior of the pile body in synchronization with the stirring, heating the interior of the pile body with hot air, controlling the temperature, and controlling the moisture content; (3) A secondary aerobic fermentation and composting device, the secondary aerobic fermentation and composting device comprising a secondary fermentation chamber and a hot air supply component, the secondary fermentation chamber being suitable for receiving the primary fermented kitchen waste delivered by the primary aerobic biochemical treatment machine, the secondary fermentation chamber being arranged as a vertical silo, the silo having a plurality of layers of silo plates vertically spaced apart to form a plurality of chambers, each of the chambers having a flipping and pushing rod with an air supply hole that can rotate radially around the center of the silo, so as to supply hot air and slowly flip the material to the drop opening of each silo plate and drop it into the next silo plate The primary fermented kitchen waste is continuously pushed by the pushing rods on each layer, and falls from top to bottom layer by layer to the bottom discharge port; each layer of the silo is provided with a sampling device to detect the fermentation status as a basis for adjusting the hot air supply and the pushing operation; the hot air supply component is suitable for supplying hot air to each chamber of the secondary fermentation chamber, and each chamber controls oxygen, temperature and humidity to meet the environmental conditions and time and space conditions required for deep decomposition in the middle and late stages of aerobic biochemistry in each chamber, and obtains a secondary fermented organic raw material with a moisture content of 42-48%; (4) A drying device, which can dry the secondary fermented organic raw material to further reduce the moisture content.

7. The aerobic fermentation treatment system for kitchen waste according to claim 6, characterized in that: The hot air supply component includes a plurality of heating air ducts, an air heater and a high-pressure fan. One end of the plurality of heating air ducts is connected to the plurality of chambers, and the other end is connected to the air outlet of the air heater. The high-pressure fan is connected to the air inlet of the air heater to supply cold air to the air heater for heating and then supply it into the plurality of heating air ducts.

8. The aerobic fermentation treatment system for kitchen waste according to claim 7, characterized in that: It also includes a solenoid valve group and a controller, wherein the solenoid valves of the solenoid valve group are arranged on the heating air ducts one by one; the controller is connected to the solenoid valve group to control the ventilation and closing of each heating air duct.

9. The aerobic fermentation treatment system for kitchen waste according to claim 6, characterized in that: It also includes (5) a screening device, wherein the vibrating screen of the screening device is 7 mesh.

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