Kitchen waste anaerobic reactor and treatment method capable of adapting to low load conditions

Abstract

The present application relates to the technical field of kitchen waste treatment, and particularly discloses a kitchen waste anaerobic reactor and treatment method capable of adapting to low load working conditions, comprising a reaction tank body, a stirrer installed in the reaction tank body, a group of feed inlet pipelines in communication with the reaction tank body, and a plurality of groups of discharge pipelines in communication with the reaction tank body and arranged axially along the reaction tank body. When the incoming material is lower than or much lower than the designed processing capacity, the volume utilization rate of the anaerobic reactor is prevented from being lost, the anaerobic microbial concentration can be maintained at a high level, the problem of instability or even collapse of the anaerobic system caused by the impact of load increase in the later period is avoided, and the problem of low C / N of biogas slurry and increased biogas slurry treatment cost caused by the extension of the anaerobic reaction residence time is avoided. Therefore, the stability of the anaerobic reactor in the low load working condition and the impact resistance when the load is increased are greatly improved, and the economic efficiency of the kitchen waste plant is improved.

Description

Technical Field

[0001] This invention relates to the field of food waste treatment technology, and more specifically, to an anaerobic reactor and treatment method for food waste that can adapt to low-load operating conditions. Background Technology

[0002] Before entering the anaerobic reactor, food waste needs to undergo sorting, pulping, and oil removal pretreatment. Mechanical sorting separates non-biodegradable materials such as plastics, aggregates, paper, shells, and fine sand to prevent wear and tear on equipment and agitators. Heating and centrifuging the food waste slurry removes oily substances, preventing the formation of highly viscous suspensions that could interfere with the anaerobic reaction. Larger particles such as fruits, vegetables, and meat are crushed to break down coarse organic matter and leach out intracellular wet components, increasing the organic matter content of the slurry and ensuring the fineness of solid particles meets the requirements for anaerobic decomposition. The core of food waste treatment—anaerobic reaction—converts organic matter into methane (the main component of biogas) and carbon dioxide through anaerobic microbial degradation.

[0003] The anaerobic digestion process takes place in a sealed container. It consists of two main stages: the first stage is the hydrolysis and acidification stage, where fermentative bacteria first break down high-molecular-weight organic matter into smaller, soluble organic molecules, such as sugars, amino acids, and fatty acids. These are then hydrolyzed into monomers by microbial enzymes (lipases, proteases, cellulases, amylases, etc.), such as cellulose becoming glucose and proteins becoming polypeptides or amino acids. Hydrogen-producing and acid-producing bacteria then convert these products into volatile organic fatty acids such as acetic acid, propionic acid, and butyric acid, simultaneously producing carbon dioxide and hydrogen. The second stage is the methanogenesis stage. Methanogens convert acetic acid into carbon dioxide and methane, or reduce carbon dioxide with hydrogen to produce methane, under the action of methanogens. These two stages are carried out in a homogenizing hydrolysis tank and an anaerobic digester, respectively.

[0004] Organic loading directly reflects the balance between organic materials and microorganisms. It is a crucial parameter for controlling the proper operation of anaerobic systems, an important process parameter for measuring the organic matter processing capacity of fermentation systems, and the most direct and accurate indicator of normal process operation. As a significant influencing parameter in the anaerobic digestion of food waste, a relatively high organic loading can generate more biogas. Once the reactor enters the overload stage, the organic loading exceeds the system's capacity, causing a significant impact on the system, inhibiting the activity of methanogens, disrupting stable system operation, and greatly reducing anaerobic digestion efficiency. Excessive organic loading leads to an acid production rate exceeding the methanogenesis rate, resulting in the accumulation of organic acids in the reactor, a decrease in pH, inhibition of methanogens, and in severe cases, reactor collapse. However, many food waste treatment plants, in their initial operation, suffer from incomplete collection and transportation systems, resulting in food waste collection volumes that are lower than or far below the plant's designed processing capacity. This leads to actual incoming materials being far below the plant's processing capacity, causing the anaerobic reactor to operate at low loads for extended periods. Prolonged operation at low organic loads leads to low volumetric utilization efficiency of the anaerobic reactor, resulting in endogenous respiration of anaerobic microorganisms and low anaerobic microbial concentrations. Later, if the incoming feed increases and the load rises, it can cause instability or even collapse of the anaerobic system. Furthermore, prolonged low-load operation extends the anaerobic reaction residence time, resulting in low COD and a low C / N ratio in the effluent, thus increasing the difficulty and cost of treating the biogas slurry. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an anaerobic reactor and treatment method for food waste that can adapt to low-load operating conditions;

[0006] The solution adopted by this invention to solve the technical problem is:

[0007] An anaerobic reactor for food waste that can adapt to low-load conditions includes a reactor body, an agitator installed inside the reactor body, a set of feed pipes connected to the reactor body, and multiple sets of discharge pipes connected to the reactor body and arranged axially along the reactor body.

[0008] This invention, through the coordinated operation of the reactor body, agitator, feed pipeline, and discharge pipeline, avoids loss of volume utilization of the reactor body when the incoming material is lower than or far below the design processing capacity. It maintains a high concentration of anaerobic microorganisms, keeps VFA / TA (organic acid / alkalinity), VS removal rate, and methane yield within the reactor body at relatively stable levels, and keeps FAN (free ammonia) at a low value. This prevents endogenous respiration of anaerobic microorganisms due to reduced substrate concentration, thus avoiding instability or even collapse of the anaerobic system caused by increased load from later-stage increased incoming material. It also avoids problems such as low C / N ratio in the biogas slurry and increased biogas slurry treatment costs due to prolonged anaerobic reaction residence time. Therefore, it greatly improves the stability of the reactor body under low-load conditions and its shock resistance when the load increases, thereby improving the economic efficiency of the food waste treatment plant.

[0009] In some possible implementations, the stirrer includes a stirring motor coaxially arranged with the reaction vessel body and located outside the reaction vessel, and a blade assembly located inside the reaction vessel and drivenly connected to the stirring motor.

[0010] In some possible implementations, the blade assembly includes a stirring shaft that is driven and connected to a stirring motor and coaxially arranged with the reaction vessel, and a first blade, a second blade, and a third blade arranged sequentially from top to bottom along the stirring shaft axial direction; the first blade, the second blade, and the third blade have the same structure and their projections on the horizontal plane are orthogonally distributed.

[0011] In some possible implementations, the first blade assembly includes a fixed sleeve fitted on the stirring shaft, and two sets of blades that are inclined to the horizontal plane and connected to the outside of the fixed sleeve; the two sets of blades are inclined in opposite directions, with one set of blades forming an angle of 45° with the horizontal plane and the other set of blades forming an angle of 135° with the horizontal plane.

[0012] In some possible implementations, two sets of blades from the first blade, the second blade, or the third blade are evenly arranged along the circumference of the fixed sleeve.

[0013] The projections of the six sets of blades in the first, second, and third blade components on the horizontal plane are evenly arranged along the circumference of the reaction vessel body.

[0014] In some possible implementations, the length of the blade is d. R is the radius of the reaction vessel.

[0015] In some possible implementations, the distance between the first blade and the bottom of the reaction vessel body is A. The distance between the first blade and the bottom of the reaction vessel body is B. The distance between the first blade and the bottom of the reaction vessel body is C. Where L is the length of the reaction vessel body along its axial direction.

[0016] In some possible implementations, the discharge pipeline consists of three sets, including pipeline one, pipeline two, and pipeline three arranged sequentially from top to bottom; pipeline one, pipeline two, and pipeline three are located on the same vertical plane.

[0017] In some possible implementations, the distance between the first pipeline and the bottom of the reaction vessel body is D, where D = L; the distance between the second pipeline and the bottom of the reaction vessel body is E. The distance F between the pipeline and the bottom of the outer side of the reaction vessel body is [missing information].

[0018] In some possible implementations, the feed line is located between the third line and the bottom plate of the reaction vessel body.

[0019] A treatment method for food waste using an anaerobic reactor adapted to low-load conditions, as described above, specifically refers to:

[0020] When the amount of material entering the reactor body from the feed pipe is less than 1 / 3 of the designed processing capacity of the reactor body, water is added to the reactor body to dilute the slurry to 1 / 3 of the designed processing capacity, so that the total solids content in the slurry is 8%-13%; during processing, after the material is fed from the feed pipe, pipes one and two are closed, and the material is discharged only from pipe three, and the first blade stirs the slurry;

[0021] When the amount of material entering the reactor body from the feed pipe is 1 / 3 to 2 / 3 of the designed processing capacity of the reactor body, water is added into the reactor body to dilute the slurry to 2 / 3 of the designed processing capacity of the reactor body, so that the total solids content in the slurry is 8%-13%; during processing, after the material is fed from the feed pipe, pipes one and three are closed, and the material is discharged only from pipe two; the first blade and the second blade simultaneously agitate the slurry;

[0022] When the amount of material entering the reactor body from the feed pipe is 2 / 3 to close to the design capacity of the reactor body, water is added into the reactor body to adjust the amount of slurry to the design capacity, and the total solids content in the slurry is ensured to be 8%-13%. During processing, after the material is fed from the feed pipe, pipes two and three are closed, and the material is discharged only from the upper discharge pipe. The first blade, the second blade, and the third blade simultaneously agitate the slurry.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] This invention, through the design of the agitator, feed pipeline, and discharge pipe, avoids the loss of volume utilization rate of the anaerobic reactor when the incoming material is lower than or far below the design processing capacity. It maintains a high concentration of anaerobic microorganisms, keeps the VFA / TA (organic acid / alkalinity), VS removal rate, and methane yield within the anaerobic reactor at relatively stable levels, and keeps FAN (free ammonia) at a low value. This prevents endogenous respiration of anaerobic microorganisms due to reduced substrate concentration, thus avoiding instability or even collapse of the anaerobic system caused by increased load due to increased incoming material. It also avoids the problems of low C / N ratio in the digestate and increased digestate treatment costs due to prolonged anaerobic reaction residence time. Therefore, it greatly improves the stability of the anaerobic reactor under low load conditions and its shock resistance when the load increases, thereby improving the economic efficiency of the food waste treatment plant.

[0025] This invention enables counter-rotating and cross-mixing of each layer of food waste slurry by incorporating a stirrer. This ensures highly uniform mixing even at low load levels below the design processing capacity, and optimizes the flow field distribution within the anaerobic reactor at these low load levels, avoiding dead zones and significantly improving mixing efficiency. Furthermore, its integration with the discharge pipeline allows for discharge of the food waste slurry after an appropriate reaction residence time when the feed load is below the design processing capacity, increasing the effective volumetric load and preventing prolonged reaction residence time. This also avoids low anaerobic microbial concentrations caused by endogenous respiration due to low organic load. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the first, second, or third blade component, the stirring shaft, and the angle formed with the horizontal plane in this invention.

[0029] Figure 4 This is a bottom view of the stirrer in this invention;

[0030] The components include: 1. Reactor body; 2. Agitator; 21. Agitator motor; 22. Agitator shaft; 23. First blade component; 24. Second blade component; 25. Third blade component; 231. Fixed sleeve; 232. Blade; 3. Feed pipe; 4. Discharge pipe. Detailed Implementation

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] The present invention will now be described in detail.

[0033] like Figures 1-4 As shown:

[0034] An anaerobic reactor for food waste that can adapt to low-load conditions includes a reaction tank body 1, a stirrer 2 installed inside the reaction tank body 1, a set of feed pipes 3 connected to the reaction tank body 1, and multiple sets of discharge pipes 4 connected to the inner body of the reaction tank and arranged along the axial direction of the reaction tank body 1.

[0035] This invention, through the coordinated operation of the reactor body 1, agitator 2, feed pipe 3, and discharge pipe 4, avoids loss of volume utilization of the reactor body 1 when the incoming material is lower than or far below the designed processing capacity. It maintains a high concentration of anaerobic microorganisms, keeps the VFA / TA (organic acid / alkalinity), VS removal rate, and methane yield within the reactor body 1 at relatively stable levels, and keeps FAN (free ammonia) at a low value. This prevents endogenous respiration of anaerobic microorganisms due to reduced substrate concentration, thus avoiding instability or even collapse of the anaerobic system caused by increased load from increased incoming material. It also avoids problems such as low C / N ratio in the biogas slurry and increased biogas slurry treatment costs due to prolonged anaerobic reaction residence time. Therefore, it greatly improves the stability of the reactor body 1 under low-load conditions and its shock resistance when the load increases, thereby improving the economic efficiency of the food waste treatment plant.

[0036] Furthermore, the reaction vessel body 1 is a cylindrical sealed vessel, and the reaction residence time is 35 days under the designed full-load operating conditions;

[0037] In some possible implementations, the stirrer 2 is a vertical three-blade shaft stirrer 2;

[0038] It includes a stirring motor 21 that is coaxially arranged with the reaction vessel body 1 and located outside the reaction vessel, and a blade assembly located inside the reaction vessel and connected to the stirring motor 21 for transmission.

[0039] In some possible implementations, the blade assembly includes a stirring shaft 22 that is drivenly connected to the stirring motor 21 and coaxially arranged with the reaction vessel, and a first blade 23, a second blade 24, and a third blade 25 arranged sequentially from top to bottom along the axial direction of the stirring shaft 22; the first blade 23, the second blade 24, and the third blade 25 have the same structure and their projections on the horizontal plane are orthogonally distributed.

[0040] In some possible implementations, the first blade component 23 includes a fixed sleeve 231 fitted on the stirring shaft 22 and two sets of blades 232 that are inclined to the horizontal plane and connected to the outside of the fixed sleeve 231; the two sets of blades 232 are inclined in opposite directions, one set of blades 232 forms an angle of 45° with the horizontal plane, and the other set of blades 232 forms an angle of 135° with the horizontal plane.

[0041] In some possible implementations, two sets of blades 232 in the first blade 23, the second blade 24, or the third blade 232 are evenly arranged along the circumference of the fixed sleeve 231.

[0042] The projections of the six sets of blades 232 in the first blade component 23, the second blade component 24, and the third blade component 25 on the horizontal plane are evenly arranged along the circumference of the reaction vessel body 1.

[0043] In some possible implementations, the length of blade 232 is d. R is the radius of the reaction vessel.

[0044] In some possible implementations, the distance between the first blade 23 and the bottom of the reaction vessel body 1 is A. The distance between the first blade 23 and the bottom of the reaction vessel body 1 is B. The distance between the first blade 23 and the bottom of the reaction vessel body 1 is C. Where L is the length of the reaction vessel body 1 along its axial direction.

[0045] The stirring shaft 22 is coaxially arranged with the axis of the reaction vessel body 1. Three sets of first blade 23, second blade 24 and third blade 25 are arranged sequentially from top to bottom and have the same structure on the stirring shaft 22.

[0046] In each set of blades (first blade 23 or second blade 24 or third blade 25), two sets of blades 232 are inclined to the horizontal plane, with one set of blades 232 forming an angle of 45° with the horizontal plane and the other set forming an angle of 135°, so that the inclination directions of the two sets of blades 232 are opposite and intersecting.

[0047] The length of the projected length of each set of blades 232 on the horizontal plane is 3 / 4 of the radius of the reactor body 1. The elevation of the third blade 25 is located at 1 / 4 elevation of the reactor body 1, the elevation of the third blade 25 is located at 1 / 2 elevation of the reactor body 1, and the elevation of the first blade 23's blade shaft is located at 3 / 4 elevation of the reactor body 1. This configuration not only enables counter-rotation and cross-mixing of the food waste slurry in each layer, but also ensures highly uniform mixing at low load levels when the food waste slurry feed load is below 1 / 3 and 2 / 3 of the design processing capacity, respectively. It also optimizes the flow field distribution within the reactor body 1 at low load levels, avoids mixing dead zones, and significantly improves mixing efficiency at low load levels. Furthermore, it allows for discharge from the corresponding outlet pipe.

[0048] Driven by the stirring motor 21, the stirring shaft 22 rotates, thereby driving the first blade 23, the second blade 24, and the third blade 25 to rotate and be stirred at different heights in the reaction tank 1. The opposing rotation and cross stirring of the kitchen waste slurry can greatly even out and optimize the flow field distribution in the anaerobic reaction tank, avoid stirring dead corners, and significantly improve stirring efficiency.

[0049] In some possible implementations, the discharge pipe 4 is in three groups, including pipe one, pipe two and pipe three arranged from top to bottom; pipe one, pipe two and pipe three are located on the same vertical plane.

[0050] In some possible implementations, the distance between the first pipeline and the bottom of the reaction vessel body 1 is D, where D = L; the distance between the second pipeline and the bottom of the reaction vessel body 1 is E. The distance F between the pipeline and the bottom of the outer side of the reaction vessel body 1 is... The feed pipe 3 is located between the pipe 3 and the bottom plate of the reaction vessel body 1.

[0051] Three sets of discharge pipes 4 are distributed on the outside of the reaction tank body 1 and on the same vertical plane. The elevations from the bottom of the tank are 1 / 3, 2 / 3 and the top of the effective volume height of the tank, respectively. This setting of different vertical elevations is beneficial to ensure that when the feed load of the kitchen waste slurry is lower than 1 / 3 and 2 / 3 of the design processing capacity, the slurry can be discharged after completing an appropriate reaction residence time and the effective volume load can be increased. This avoids prolonged reaction residence time and avoids low organic load causing endogenous respiration of anaerobic microorganisms, resulting in low concentration of anaerobic microorganisms.

[0052] A treatment method for food waste using an anaerobic reactor adapted to low-load conditions, as described above, specifically refers to:

[0053] When the amount of material entering the reaction tank body 1 from the feed pipe 3 is less than 1 / 3 of the designed processing capacity of the reaction tank body 1, water is added to the reaction tank body 1 to dilute the slurry to 1 / 3 of the designed processing capacity, so that the total solids content in the slurry is 8%-13%; during processing, after the material is fed from the feed pipe 3, pipes 1 and 2 are closed, and the material is discharged only from pipe 3. The first blade 23 stirs the slurry, while the second blade 24 and the third blade 25 run idle.

[0054] When the amount of material entering the reaction tank body 1 from the feed pipe 3 is 1 / 3 to 2 / 3 of the designed processing capacity of the reaction tank body 1, water is added to the reaction tank body 1 to dilute the slurry to 2 / 3 of the designed processing capacity of the reaction tank body 1, so that the total solids content in the slurry is 8%-13%; during processing, after the material enters from the feed pipe 3, pipes 1 and 3 are closed, and the material is discharged only from pipe 2; the first blade 23 and the second blade 24 simultaneously stir the slurry, while the third blade 25 idles;

[0055] When the amount of material entering the reaction tank body 1 from the feed pipe 3 is 2 / 3 to close to the design capacity of the reaction tank body 1, water is added to the reaction tank body 1 to adjust the amount of slurry to the design capacity, and the total solids content in the slurry is ensured to be 8%-13%. During processing, after the material enters from the feed pipe 3, pipes 2 and 3 are closed, and the material is discharged only from pipe 1. The first blade 23, the second blade 24, and the third blade 25 simultaneously stir the slurry.

[0056] Specifically, the water added to the reaction tank body 1 can be recycled water from the waste treatment plant or other water.

[0057] Using the anaerobic reactor and treatment method for food waste in this invention, the gas production rate per unit organic matter is 570-590 L / KgOTS, the organic matter degradation rate is 86%-90%, and the COD of the anaerobic digester slurry is 9000-11000 mg / L. It can be seen that the anaerobic treatment method of this invention under low load conditions still achieves good reaction effect in the anaerobic reactor.

[0058] This invention allows for the discharge of treated materials through corresponding pipelines (pipeline one, pipeline two, and pipeline three) based on the incoming material volume, avoiding excessive degradation. It prevents volumetric utilization loss in the anaerobic reactor even when the incoming material volume is lower than or far below the designed processing capacity, maintaining a high anaerobic microbial concentration, stable VFA / TA (organic acid / alkalinity), VS removal rate, and methane yield within the reactor, and a low FAN (free ammonia) value. This prevents endogenous respiration of anaerobic microorganisms due to reduced substrate concentration, thus avoiding instability or even collapse of the anaerobic system caused by increased incoming material and load. It also avoids low C / N ratios in the digestate and increased digestate treatment costs due to prolonged anaerobic reaction residence time. Therefore, it significantly improves the stability of the anaerobic reactor under low-load conditions and its resistance to shocks when the load increases, thereby improving the economic efficiency of the food waste treatment plant.

[0059] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A method for anaerobic treatment of kitchen waste that can adapt to low-load operating conditions, characterized in that, Based on the anaerobic reactor for food waste that can adapt to low-load conditions, the anaerobic reactor for food waste includes a reaction tank body, an agitator installed inside the reaction tank body, a set of feed pipes connected to the reaction tank body, and multiple sets of discharge pipes connected to the inner body of the reaction tank and arranged along the axial direction of the reaction tank body. The stirrer includes a stirring motor coaxially arranged with the reaction vessel body and located outside the reaction vessel, and a blade assembly located inside the reaction vessel and drivenly connected to the stirring motor. The blade assembly includes a stirring shaft connected to the stirring electric drive and coaxially arranged with the reaction vessel, and a first blade, a second blade, and a third blade arranged sequentially from top to bottom along the stirring shaft axial direction; the first, second, and third blades have the same structure and their projections on the horizontal plane are orthogonally distributed; the discharge pipeline consists of three sets, including pipeline one, pipeline two, and pipeline three arranged sequentially from top to bottom; pipeline one, pipeline two, and pipeline three are located on the same vertical plane; the feed pipeline is located between pipeline three and the bottom plate of the reaction vessel body; specifically: When the amount of material entering the reactor body from the feed pipe is less than 1 / 3 of the designed processing capacity of the reactor body, water is added to the reactor body to dilute the slurry to 1 / 3 of the designed processing capacity, so that the total solids content in the slurry is 8%-13%; during processing, after the material is fed from the feed pipe, pipes one and two are closed, and the material is discharged only from pipe three, and the third blade is used to stir the slurry. When the amount of material entering the reactor body from the feed pipe is 1 / 3 to 2 / 3 of the designed processing capacity of the reactor body, water is added into the reactor body to dilute the slurry to 2 / 3 of the designed processing capacity of the reactor body, so that the total solids content in the slurry is 8%-13%; during processing, after the material is fed from the feed pipe, pipes one and three are closed, and the material is discharged only from pipe two; the third blade and the second blade simultaneously agitate the slurry; When the amount of material entering the reactor body from the feed pipe is 2 / 3 to close to the design capacity of the reactor body, water is added into the reactor body to adjust the amount of slurry to the design capacity, and the total solids content in the slurry is ensured to be 8%-13%. During processing, after the material is fed from the feed pipe, pipes two and three are closed, and the material is discharged only from pipe one. The first blade, the second blade, and the third blade simultaneously agitate the slurry.

2. The method for anaerobic treatment of kitchen waste adaptable to low-load conditions according to claim 1, characterized in that, The first blade assembly includes a fixed sleeve fitted on the stirring shaft, and two sets of blades that are inclined to the horizontal plane and connected to the outside of the fixed sleeve; the two sets of blades are inclined in opposite directions, with one set of blades forming an angle of 45° with the horizontal plane and the other set of blades forming an angle of 135° with the horizontal plane.

3. The method for anaerobic treatment of kitchen waste adaptable to low-load conditions according to claim 2, characterized in that, Two sets of blades in the first, second, or third blade assembly are evenly arranged along the circumference of the fixed sleeve. The projections of the six sets of blades in the first, second, and third blade components on the horizontal plane are evenly arranged along the circumference of the reaction vessel body.

4. The method for anaerobic treatment of kitchen waste adaptable to low-load conditions according to claim 2, characterized in that, The length of the blade is d. R is the radius of the reaction vessel.

5. The anaerobic treatment method for kitchen waste adaptable to low-load conditions according to claim 1, characterized in that, The distance between the first blade and the bottom of the reaction vessel body is A. The distance between the second blade and the bottom of the reaction vessel body is B. The distance between the third blade and the bottom of the reaction vessel body is C. ;in, L is the length of the reaction vessel body along its axial direction.

6. The method for anaerobic treatment of kitchen waste adaptable to low-load conditions according to claim 5, characterized in that, The distance D between the pipeline and the bottom of the reaction vessel body is [missing information]. The distance E between the second pipeline and the bottom of the reaction vessel body is... The distance F between the three parts of the pipeline and the bottom of the reaction vessel body is [missing information]. .

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