Kitchen waste anaerobic fermentation system

Abstract

The utility model discloses a kitchen waste anaerobic fermentation system which comprises an anaerobic fermentation unit, a solid-liquid separation unit, a first conveying unit and a second conveying unit, and the anaerobic fermentation unit can enable raw materials to be fermented in an anaerobic state; the solid-liquid separation unit can be used for carrying out dehydration treatment on the fermented materials to obtain sludge; the inlet end of the first conveying unit is communicated with the discharging end of the anaerobic fermentation unit, the outlet end of the first conveying unit is communicated with the inlet end of the solid-liquid separation unit, and the first conveying unit is used for conveying fermented materials into the solid-liquid separation unit. The kitchen waste anaerobic fermentation system disclosed by the utility model has the beneficial effects that the kitchen waste anaerobic fermentation system has a function of maintaining strain balance, and can treat more kitchen wastes under the condition that the anaerobic fermentation volume is not changed, so that the kitchen waste treatment efficiency of the anaerobic fermentation system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to kitchen garbage processing technical field especially relates to a kind of kitchen waste anaerobic fermentation system. BACKGROUND

[0002] At present, anaerobic fermentation process is generally used to treat kitchen waste in China, and the organic matter in kitchen waste is degraded into small molecules under the action of anaerobic bacteria, and finally converted into biogas. In actual production operation, the conventional anaerobic fermentation process is run (such as the dry-wet parallel high-temperature anaerobic fermentation process and system for kitchen waste disclosed in application No. 201510272654.4), which may have the problems of low processing efficiency of the anaerobic fermentation system, poor system stability and only low-load operation. According to the characteristics of kitchen waste raw materials and the actual production operation, it is found that the essential reason for the above problems of the anaerobic fermentation system is that the high-oil kitchen waste raw materials are prone to cause the loss of anaerobic fermentation microbial strains, and the anaerobic fermentation system does not have the function of maintaining the balance of the strains. SUMMARY

[0003] The utility model aims at overcoming the above technical deficiencies, and provides a kitchen waste anaerobic fermentation system to solve the technical problem that the existing anaerobic fermentation system does not have the function of maintaining the balance of anaerobic fermentation microbial strains.

[0004] To achieve the above technical purpose, the technical scheme of the utility model provides a kitchen waste anaerobic fermentation system, which comprises:

[0005] An anaerobic fermentation unit, which can ferment raw materials in an anaerobic state;

[0006] A solid-liquid separation unit, which can dehydrate the fermented material to obtain sludge;

[0007] A first conveying unit, the inlet end of which is communicated with the discharge end of the anaerobic fermentation unit, and the outlet end of which is communicated with the inlet end of the solid-liquid separation unit, for conveying the fermented material into the solid-liquid separation unit;

[0008] A second conveying unit, the inlet end of which is communicated with the discharge end of the solid-liquid separation unit, and the outlet end of which is communicated with the inlet end of the anaerobic fermentation unit, for conveying the dehydrated sludge into the anaerobic fermentation unit.

[0009] Further, the anaerobic fermentation unit comprises an anaerobic fermentation tank, which has a closable feed inlet, an exhaust outlet and a discharge outlet. The feed inlet is used for adding kitchen waste, and the exhaust outlet is used for discharging biogas. The inlet end of the first conveying unit is communicated with the discharge outlet, and the outlet end of the second conveying unit is communicated with the feed inlet.

[0010] Further, the anaerobic fermentation unit further comprises a gas-liquid separation assembly arranged in the anaerobic fermentation tank, an outlet end of the gas-liquid separation assembly being communicated with the gas outlet to separate water in the gas.

[0011] Further, the gas-liquid separation assembly comprises at least one separation plate and a defoaming net, each of the separation plates being in an umbrella structure and being spacedly distributed from bottom to top, a plurality of gas holes being formed in the separation plates, and the defoaming net being arranged above each of the separation plates and being close to the gas outlet.

[0012] Further, the anaerobic fermentation unit further comprises a stirring assembly arranged in the anaerobic fermentation tank to stir the raw materials in the anaerobic fermentation tank.

[0013] Further, the stirring assembly comprises a stirring paddle and a rotating driving member, a main shaft of the stirring paddle being horizontally arranged and being rotatably connected with the anaerobic fermentation tank, and an output end of the rotating driving member being rotatably connected with one end of the main shaft of the stirring paddle to drive the main shaft of the stirring paddle to rotate so as to stir the raw materials by the stirring paddle.

[0014] Further, the anaerobic fermentation unit further comprises a baffle arranged in the anaerobic fermentation tank and being close to the feeding port, the baffle having a horizontal plate surface and a vertical plate surface connected with each other, the horizontal plate surface being above the feeding port, and the vertical plate surface being aligned with the feeding port to block the raw materials so as to change a moving track of the raw materials.

[0015] Further, the solid-liquid separation unit comprises a centrifugal machine and a sludge hopper, the centrifugal machine being capable of dehydrating the fermented materials, an inlet end of the sludge hopper being communicated with a discharging end of the centrifugal machine to buffer the dehydrated sludge, an inlet end of the first conveying unit being communicated with an inlet end of the centrifugal machine, and an inlet end of the second conveying unit being communicated with a discharging end of the sludge hopper.

[0016] Further, the first conveying unit comprises a buffer storage tank, a first conveying assembly, a second conveying assembly and a third conveying assembly, the buffer storage tank being used to store the fermented materials, an inlet end of the first conveying assembly being communicated with the discharging port, an outlet end of the first conveying assembly being communicated with an inlet end of the buffer storage tank to convey the fermented materials into the buffer storage tank, an inlet end of the second conveying assembly being communicated with a first outlet end of the buffer storage tank, an outlet end of the second conveying assembly being communicated with the inlet end of the centrifugal machine to convey the materials buffered in the buffer storage tank into the centrifugal machine, and an inlet end of the third conveying assembly being communicated with a second outlet end of the buffer storage tank.

[0017] Further, the second conveying unit comprises a sludge storage tank, a fourth conveying assembly, a fifth conveying assembly and a sixth conveying assembly, the sludge storage tank is used for storing the dewatered sludge, the inlet end of the fourth conveying assembly is communicated with the first discharging end of the hopper, the outlet end of the fourth conveying assembly is communicated with the inlet end of the sludge drying system, and the sludge stored in the hopper is conveyed into the sludge drying system, the inlet end of the fifth conveying assembly is communicated with the second discharging end of the hopper, the outlet end of the fifth conveying assembly is communicated with the first inlet end of the sludge storage tank, and the sludge stored in the hopper is conveyed into the sludge storage tank, the inlet end of the sixth conveying assembly is communicated with the outlet end of the sludge storage tank, and the outlet end of the sixth conveying assembly is communicated with the feeding port, so that the sludge in the sludge storage tank is conveyed into the anaerobic fermentation tank.

[0018] Compared with the prior art, the beneficial effects of the utility model include: in use, the kitchen waste raw materials enter the anaerobic fermentation unit, the raw materials can be fermented in an anaerobic state through the anaerobic fermentation unit, the fermented materials can be conveyed into the solid-liquid separation unit through the first conveying unit, the fermented materials can be dewatered and treated through the solid-liquid separation unit, and sludge is obtained, and the dewatered sludge can be conveyed into the anaerobic fermentation unit through the second conveying unit, because the dewatered sludge contains a large amount of anaerobic fermentation microbial strains, the dewatered sludge backflow into the anaerobic fermentation unit can maintain the balance of the strains, in addition, because ferric chloride needs to be added when the solid-liquid separation unit dewatered and treats the fermented materials, the dewatered sludge also contains a large amount of iron ions, the dewatered sludge backflow into the anaerobic fermentation unit, the iron ions react with hydrogen sulfide, and the content of hydrogen sulfide in the biogas can be greatly reduced, the kitchen waste anaerobic fermentation system has the function of maintaining the balance of the strains, under the condition that the anaerobic fermentation volume is unchanged, the anaerobic fermentation system can treat more kitchen waste, and the efficiency of the anaerobic fermentation system treating the kitchen waste is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of a kitchen waste anaerobic fermentation system provided by the utility model;

[0020] Figure 2 It is a three-dimensional structural schematic view of an anaerobic fermentation unit provided by the utility model;

[0021] Figure 3 It is a sectional view of the anaerobic fermentation unit in Figure 2

[0022] Figure 4 It is a three-dimensional structural schematic view of a defoaming net in Figure 3 ​​

[0023] In the figure: 100 - anaerobic fermentation unit, 110 - anaerobic fermentation tank, 111 - feeding port, 112 - exhaust port, 113 - discharge port, 120 - gas-liquid separation assembly, 121 - separation plate, 1211 - gas hole, 122 - defoaming net, 130 - stirring assembly, 131 - stirring paddle, 132 - rotating driving member, 140 - baffle, 141 - horizontal plate surface, 142 - vertical plate surface, 200 - solid-liquid separation unit, 210 - centrifuge, 220 - hopper, 300 - first conveying unit, 310 - buffer tank, 320 - first conveying assembly, 330 - second conveying assembly, 340 - third conveying assembly, 400 - second conveying unit, 410 - sludge storage tank, 420 - fourth conveying assembly, 430 - fifth conveying assembly, 440 - sixth conveying assembly, 500 - raw material storage unit, 510 - raw material storage tank, 520 - seventh conveying assembly. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail by combining with the drawings and examples. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0025] The utility model provides a kind of kitchen waste anaerobic fermentation system, its structure as shown in Figure 1 The utility model provides a kind of kitchen waste anaerobic fermentation system, its structure as shown in Figure 1, including anaerobic fermentation unit 100, solid-liquid separation unit 200, first conveying unit 300 and second conveying unit 400, anaerobic fermentation unit 100 can make raw material ferment under anaerobic state;Solid-liquid separation unit 200 can carry out dewatering treatment to material after fermentation, to obtain sludge;The import end of first conveying unit 300 is communicated with the discharge end of anaerobic fermentation unit 100, and the export end of first conveying unit 300 is communicated with the import end of solid-liquid separation unit 200, to convey material after fermentation into solid-liquid separation unit 200;The import end of second conveying unit 400 is communicated with the discharge end of solid-liquid separation unit 200, and the export end of second conveying unit 400 is communicated with the import end of anaerobic fermentation unit 100, to convey sludge after dewatering into anaerobic fermentation unit 100.

[0026] In use, the kitchen waste raw material enters the anaerobic fermentation unit 100, and the raw material can be fermented in an anaerobic state through the anaerobic fermentation unit 100. The fermented material can be transported to the solid-liquid separation unit 200 through the first conveying unit 300. The fermented material can be dehydrated through the solid-liquid separation unit 200, and sludge can be obtained. The dehydrated sludge can be transported to the anaerobic fermentation unit 100 through the second conveying unit 400. Since the dehydrated sludge contains a large amount of anaerobic fermentation microbial strains, the return of the dehydrated sludge to the anaerobic fermentation unit 100 can maintain the balance of the strains. In addition, since ferric chloride needs to be added when the solid-liquid separation unit 200 dehydrates the fermented material, the dehydrated sludge also contains a large amount of iron ions. The return of the dehydrated sludge to the anaerobic fermentation unit 100 can cause the iron ions to react with hydrogen sulfide, thereby greatly reducing the hydrogen sulfide content in the biogas. The kitchen waste anaerobic fermentation system has the function of maintaining the balance of the strains. In the case where the anaerobic fermentation volume is unchanged, the anaerobic fermentation system can process more kitchen waste, thereby improving the efficiency of the anaerobic fermentation system in processing kitchen waste.

[0027] As a preferred embodiment, please refer to Figure 2 The anaerobic fermentation unit 100 includes an anaerobic fermentation tank 110. The anaerobic fermentation tank 110 has a closable feed inlet 111, an exhaust port 112, and a discharge port 113. The feed inlet 111 is used to add kitchen waste. The exhaust port 112 is used to discharge biogas. The exhaust port 112 is in communication with the inlet end of a biogas collection system. The inlet end of the first conveying unit 300 is in communication with the discharge port 113. The outlet end of the second conveying unit 400 is in communication with the feed inlet 111. The kitchen waste raw material to be fermented enters the anaerobic fermentation tank 110 from the feed inlet 111 and is fermented in the anaerobic fermentation tank 110. The biogas produced by fermentation can enter the biogas collection system through the exhaust port 112, thereby achieving the recycling of biogas. The fermented material can reach the first conveying unit 300 through the discharge port 113.

[0028] As a preferred embodiment, please refer to Figure 3 The anaerobic fermentation unit 100 further includes a gas-liquid separation assembly 120. The gas-liquid separation assembly 120 is arranged in the anaerobic fermentation tank 110 and located in the upper space of the anaerobic fermentation tank 110. The outlet end of the gas-liquid separation assembly 120 is in communication with the exhaust port 112, so as to separate water in the gas and reduce the water content in the biogas discharged from the exhaust port 112.

[0029] As a preferred embodiment, please refer to Figure 3 and Figure 4The gas-liquid separation assembly 120 comprises at least one separation plate 121 and a defoaming net 122, each of the separation plates 121 is in an umbrella shape and is spacedly arranged from bottom to top, a plurality of air holes 1211 are formed in the separation plate 121, and the defoaming net 122 is arranged above each of the separation plates 121 and close to the exhaust port 112. Since water droplets have weight and sink downward, biogas moves upward, and when passing through the separation plate 121, the water droplets carried by the biogas are separated, so that the water droplets condense on the separation plate 121 and flow downward along the separation plate 121. The working principle of the defoaming net 122 is based on processes such as inertial collision, liquid mist adhesion, diffusion and gravity settling. When the gas containing liquid mist passes through the defoaming net 122, the liquid mist collides with the filaments due to inertia and adheres to the surface of the filaments, the liquid mist on the surface of the filaments further diffuses, and at the same time, due to the surface tension of the liquid and the capillary action of the filaments, the liquid droplets gradually coalesce and grow. When the liquid droplets increase to the point that the self-gravity exceeds the combined force of the upward buoyancy of the gas and the surface tension of the liquid, the liquid droplets fall, thereby realizing gas-liquid separation.

[0030] As a preferred embodiment, refer to Figure 4 The defoaming net 122 is woven by steel wires.

[0031] As a preferred embodiment, refer to Figure 2 and Figure 3 The anaerobic fermentation unit 100 further comprises a stirring assembly 130, which is arranged in the anaerobic fermentation tank 110 and located in the lower space of the anaerobic fermentation tank 110, so as to stir the raw materials in the anaerobic fermentation tank 110, so that the fermentation is more uniform and the fermentation speed of the raw materials is accelerated.

[0032] As a preferred embodiment, refer to Figure 3 The stirring assembly 130 comprises a stirring paddle 131 and a rotating driving member 132. The main shaft of the stirring paddle 131 is horizontally arranged and rotationally connected with the anaerobic fermentation tank 110. The output end of the rotating driving member 132 is rotationally connected with one end of the main shaft of the stirring paddle 131, for driving the main shaft of the stirring paddle 131 to rotate, so that the stirring paddle 131 stirs the raw materials. By controlling the rotating driving member 132, the rotating driving member 132 drives the main shaft of the stirring paddle 131 to rotate, so that the stirring paddle 131 can stir the raw materials.

[0033] As a preferred embodiment, refer to Figure 3The anaerobic fermentation unit 100 further comprises a baffle 140 arranged in the anaerobic fermentation tank 110 and close to the feeding port 111. The baffle 140 has horizontally connected horizontal plate surface 141 and vertical plate surface 142. The horizontal plate surface 141 is above the feeding port 111, and the vertical plate surface 142 is aligned with the feeding port 111 to block the raw material, so as to change the moving track of the raw material. When the raw material enters the anaerobic fermentation tank 110 from the feeding port 111, the raw material moves downward due to the blocking of the vertical plate surface 142, so as to avoid splashing of the raw material.

[0034] As a preferred embodiment, refer to Figure 1 The solid-liquid separation unit 200 comprises a centrifugal machine 210 and a sludge hopper 220. The centrifugal machine 210 can perform dehydration treatment on the fermented material. The inlet end of the sludge hopper 220 is in communication with the outlet end of the centrifugal machine 210, so as to buffer the dehydrated sludge. The outlet end of the first conveying unit 300 is in communication with the inlet end of the centrifugal machine 210, and the inlet end of the second conveying unit 400 is in communication with the outlet end of the sludge hopper 220. The fermented material enters the centrifugal machine 210. The centrifugal machine 210 rotates at high speed to realize separation of solid and liquid. The dehydrated sludge can be temporarily stored in the sludge hopper 220.

[0035] As a preferred embodiment, refer to Figure 1 The first conveying unit 300 comprises a buffer storage tank 310, a first conveying assembly 320, a second conveying assembly 330 and a third conveying assembly 340. The buffer storage tank 310 is used to store the fermented material. The inlet end of the first conveying assembly 320 is in communication with the discharge port 113, and the outlet end of the first conveying assembly 320 is in communication with the inlet end of the buffer storage tank 310, so as to convey the fermented material into the buffer storage tank 310. The inlet end of the second conveying assembly 330 is in communication with the first outlet end of the buffer storage tank 310, and the outlet end of the second conveying assembly 330 is in communication with the inlet end of the centrifugal machine 210, so as to convey the material buffered in the buffer storage tank 310 into the centrifugal machine 210. The inlet end of the third conveying assembly 340 is in communication with the second outlet end of the buffer storage tank 310. The fermented material is discharged from the discharge port 113 and reaches the first conveying assembly 320, and is conveyed by the first conveying assembly 320 into the buffer storage tank 310, so as to avoid the problem that, when the centrifugal machine 210 separates solid and liquid slowly, the material has no place to be stored, which affects the fermentation efficiency. The material in the buffer storage tank 310 is conveyed into the centrifugal machine 210 by the second conveying assembly 330.

[0036] As a preferred embodiment, refer to Figure 1The second conveying unit 400 includes a sludge storage tank 410, a fourth conveying assembly 420, a fifth conveying assembly 430, and a sixth conveying assembly 440. The sludge storage tank 410 is used to store the dewatered sludge. The inlet end of the fourth conveying assembly 420 is in communication with the first discharge end of the hopper 220, and the outlet end of the fourth conveying assembly 420 is in communication with the inlet end of the sludge drying system, so as to convey the sludge stored in the hopper 220 to the sludge drying system. The inlet end of the fifth conveying assembly 430 is in communication with the second discharge end of the hopper 220, and the outlet end of the fifth conveying assembly 430 is in communication with the first inlet end of the sludge storage tank 410, so as to convey the sludge stored in the hopper 220 to the sludge storage tank 410. The inlet end of the sixth conveying assembly 440 is in communication with the outlet end of the sludge storage tank 410, and the outlet end of the sixth conveying assembly 440 is in communication with the feeding port 111, so as to convey the sludge in the sludge storage tank 410 to the anaerobic fermentation tank 110. When the sludge concentration in the anaerobic fermentation tank needs to be increased, the sludge in the hopper 220 can be conveyed to the sludge storage tank 410 through the fifth conveying assembly 430, and then the sludge in the sludge storage tank 410 can be conveyed to the anaerobic fermentation tank through the sixth conveying assembly 440. When the sludge concentration in the anaerobic fermentation tank does not need to be increased, the sludge in the hopper 220 can be conveyed to the sludge drying system through the fourth conveying assembly 420 for further dewatering treatment.

[0037] As a preferred embodiment, refer to Figure 1 The outlet end of the third conveying assembly 340 is in communication with the second inlet end of the sludge storage tank 410, so as to convey the material stored in the buffer storage tank 310 to the sludge storage tank 410. When the sludge concentration in the anaerobic fermentation tank is significantly low, the material stored in the buffer storage tank 310 can also be conveyed to the sludge storage tank 410 through the third conveying assembly 340, so as to further accelerate the speed of increasing the sludge concentration in the anaerobic fermentation tank.

[0038] As a preferred embodiment, refer to Figure 1The kitchen waste anaerobic fermentation system further comprises a raw material storage unit 500, the raw material storage unit 500 comprises a raw material storage tank 510 and a seventh conveying assembly 520, the raw material storage tank 510 is used for storing raw materials to be fermented, the inlet end of the seventh conveying assembly 520 is communicated with the outlet end of the raw material storage tank 510, and the outlet end of the seventh conveying assembly 520 is communicated with the feeding port 111, so as to convey the raw materials in the raw material storage tank 510 into the anaerobic fermentation tank 110, and the materials are stored in the raw material storage tank 510 after being processed, thereby avoiding the problem that when the anaerobic fermentation tank 110 ferments slowly, the materials have no place to be stored, and the fermentation efficiency is affected.

[0039] As a preferred embodiment, refer to Figure 1 The seventh conveying assembly 520 and the sixth conveying assembly 440 have a shared part.

[0040] As a preferred embodiment, the first conveying assembly 320, the second conveying assembly 330, the third conveying assembly 340, the fourth conveying assembly 420, the fifth conveying assembly 430, the sixth conveying assembly 440 and the seventh conveying assembly 520 are all spiral conveyors.

[0041] In order to better understand the present application, the following will be combined with Figure 1 - Figure 4 The working principle of the technical scheme of the present application is described in detail:

[0042] In use, the incoming material is stored in the raw material storage tank 510 after various treatments, the raw material in the raw material storage tank 510 is transported to the anaerobic fermentation tank 110 by the seventh conveying assembly 520, the kitchen waste raw material enters the anaerobic fermentation tank 110, and is fermented in an anaerobic state, and the fermented material is discharged from the discharge port 113 and reaches the first conveying assembly 320, and is transported to the buffer storage tank 310 by the first conveying assembly 320, the material in the buffer storage tank 310 is transported to the centrifuge 210 by the second conveying assembly 330, the centrifuge 210 rotates at high speed to realize the separation of solid and liquid, and the dewatered sludge can be temporarily stored in the sludge hopper 220, when the sludge concentration in the anaerobic fermentation tank needs to be increased, the sludge in the sludge hopper 220 can be transported to the sludge storage tank 410 by the fifth conveying assembly 430, and then the sludge in the sludge storage tank 410 is transported to the anaerobic fermentation tank by the sixth conveying assembly 440, when the sludge concentration in the anaerobic fermentation tank does not need to be increased, the sludge in the sludge hopper 220 can be transported to the sludge drying system for further dewatering treatment by the fourth conveying assembly 420, and when the sludge concentration in the anaerobic fermentation tank is significantly lower, the buffer material in the buffer storage tank 310 can be transported to the sludge storage tank 410 by the third conveying assembly 340, so as to further accelerate the speed of increasing the sludge concentration in the anaerobic fermentation tank, since the dewatered sludge contains a large amount of anaerobic fermentation microbial strains, the return of the dewatered sludge to the anaerobic fermentation unit 100 can maintain the balance of the strains, in addition, since ferric chloride needs to be added during the dewatering treatment of the fermented material by the solid-liquid separation unit 200, the dewatered sludge also contains a large amount of iron ions, the return of the dewatered sludge to the anaerobic fermentation unit 100 can react with hydrogen sulfide to greatly reduce the hydrogen sulfide content in biogas, the kitchen waste anaerobic fermentation system has the function of maintaining the balance of strains, and under the condition that the anaerobic fermentation volume is unchanged, the anaerobic fermentation system can process more kitchen waste, thereby improving the efficiency of the anaerobic fermentation system in processing kitchen waste, and the return of the dewatered sludge to the anaerobic fermentation unit 100 can sufficiently reduce the VFA, ammonia nitrogen and hydrogen sulfide content in biogas, thereby creating favorable conditions for the treatment of biogas and the purification treatment of biogas.

[0043] The kitchen waste anaerobic fermentation system has the following beneficial effects:

[0044] (1) Because water droplets have weight to deposit downward, biogas moves upward, when passing through the separation plate 121, the larger water droplets carried by the biogas are separated, so that the water droplets condense on the separation plate 121 and flow downward along the separation plate 121, the working principle of the defoaming net 122 is based on processes such as inertial collision, liquid mist adhesion, diffusion and gravity settling, when the gas containing liquid mist passes through the defoaming net 122, the liquid mist collides with the filament due to inertia and adheres to the surface of the filament, the liquid mist on the surface of the filament further diffuses, and at the same time, due to the surface tension of the liquid and the capillary action of the filament, the liquid droplets gradually coalesce and grow, when the liquid droplets increase to the force of their own gravity exceeding the combined force of the upward buoyancy of the gas and the surface tension of the liquid, the liquid droplets will fall, thereby realizing gas-liquid separation and reducing the water content in the biogas;

[0045] (2) By controlling the rotating driving element 132, the rotating driving element 132 drives the rotation of the main shaft of the stirring paddle 131, so that the stirring paddle 131 can stir the raw materials, so that the fermentation is more uniform, and the fermentation speed of the raw materials is accelerated;

[0046] (3) The present kitchen waste anaerobic fermentation system has the function of maintaining the balance of strains, and under the condition that the anaerobic fermentation volume is unchanged, the anaerobic fermentation system can treat more kitchen waste, and the efficiency of the anaerobic fermentation system for treating kitchen waste is improved, and the dewatered sludge is returned to the anaerobic fermentation unit 100, which can sufficiently reduce the VFA, ammonia nitrogen and hydrogen sulfide content in the biogas, and create favorable conditions for the treatment of biogas and the purification treatment of biogas.

[0047] The specific implementation mode of the above-mentioned utility model does not constitute a limitation on the protection scope of the utility model. Any various other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the utility model claim.

Claims

1. An anaerobic fermentation system for kitchen waste, characterized in that, The application relates to a kitchen waste treatment device. The kitchen waste treatment device comprises an anaerobic fermentation unit, a solid-liquid separation unit, a first conveying unit and a second conveying unit. The anaerobic fermentation unit is used for fermenting raw materials in an anaerobic state. The solid-liquid separation unit is used for dehydrating the fermented materials to obtain sludge. The first conveying unit is used for conveying the fermented materials to the solid-liquid separation unit.

2. The kitchen waste anaerobic fermentation system according to claim 1, characterized in that, The second conveying unit is used for conveying the dehydrated sludge to the anaerobic fermentation unit.

3. The kitchen waste anaerobic fermentation system according to claim 2, characterized in that, The anaerobic fermentation unit comprises an anaerobic fermentation tank.

4. The kitchen waste anaerobic fermentation system according to claim 3, characterized in that, The anaerobic fermentation tank has a closable feeding port, an exhaust port and a discharging port.

5. The kitchen waste anaerobic fermentation system according to claim 2, characterized in that, The feeding port is used for adding kitchen waste.

6. The kitchen waste anaerobic fermentation system according to claim 5, characterized in that, The exhaust port is used for discharging biogas.

7. The kitchen waste anaerobic fermentation system according to claim 2, characterized in that, The first conveying unit is connected with the discharging port.

8. The kitchen waste anaerobic fermentation system according to claim 2, characterized in that, The second conveying unit is connected with the feeding port. The anaerobic fermentation unit further comprises a gas-liquid separation assembly. The gas-liquid separation assembly is arranged in the anaerobic fermentation tank. The outlet of the gas-liquid separation assembly is connected with the exhaust port. The gas-liquid separation assembly is used for separating water in the gas. The gas-liquid separation assembly comprises at least one separation plate and a defoaming net. Each separation plate is in an umbrella shape and is arranged in a spaced manner from bottom to top. A plurality of air holes are arranged on the separation plate. The defoaming net is arranged above each separation plate and is close to the exhaust port. The anaerobic fermentation unit further comprises a stirring assembly. The stirring assembly is arranged in the anaerobic fermentation tank and is used for stirring the raw materials in the anaerobic fermentation tank. The stirring assembly comprises a stirring paddle and a rotating driving element. The main shaft of the stirring paddle is horizontally arranged and is rotatably connected with the anaerobic fermentation tank. The output end of the rotating driving element is rotatably connected with one end of the main shaft of the stirring paddle. The rotating driving element is used for driving the main shaft of the stirring paddle to rotate so that the stirring paddle stirs the raw materials. The anaerobic fermentation unit further comprises a baffle. The baffle is arranged in the anaerobic fermentation tank and is close to the feeding port. The baffle comprises a horizontal plate surface and a vertical plate surface which are connected with each other. The horizontal plate surface is arranged above the feeding port. The vertical plate surface is arranged above the feeding port and is used for blocking the raw materials to change the moving track of the raw materials. The solid-liquid separation unit comprises a centrifugal machine and a sludge hopper. The centrifugal machine is used for dehydrating the fermented materials. The inlet of the sludge hopper is connected with the outlet of the centrifugal machine. The outlet of the first conveying unit is connected with the inlet of the centrifugal machine. The inlet of the second conveying unit is connected with the outlet of the sludge hopper.

9. The kitchen waste anaerobic fermentation system according to claim 8, characterized in that, The first conveying unit comprises a buffer tank, a first conveying assembly, a second conveying assembly and a third conveying assembly. The buffer tank is used to store the fermented material. The inlet end of the first conveying assembly is communicated with the discharge port. The outlet end of the first conveying assembly is communicated with the inlet end of the buffer tank, so as to convey the fermented material into the buffer tank. The inlet end of the second conveying assembly is communicated with the first outlet end of the buffer tank. The outlet end of the second conveying assembly is communicated with the inlet end of the centrifuge, so as to convey the material stored in the buffer tank into the centrifuge. The inlet end of the third conveying assembly is communicated with the second outlet end of the buffer tank.

10. The kitchen waste anaerobic fermentation system according to claim 8, characterized in that, The second conveying unit comprises a sludge tank, a fourth conveying assembly, a fifth conveying assembly and a sixth conveying assembly. The sludge tank is used to store the dewatered sludge. The inlet end of the fourth conveying assembly is communicated with the first discharge end of the hopper. The outlet end of the fourth conveying assembly is communicated with the inlet end of the sludge drying system, so as to convey the sludge stored in the hopper into the sludge drying system. The inlet end of the fifth conveying assembly is communicated with the second discharge end of the hopper. The outlet end of the fifth conveying assembly is communicated with the first inlet end of the sludge tank, so as to convey the sludge stored in the hopper into the sludge tank. The inlet end of the sixth conveying assembly is communicated with the outlet end of the sludge tank. The outlet end of the sixth conveying assembly is communicated with the feed port, so as to convey the sludge in the sludge tank into the anaerobic fermentation tank.

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