A co-processing device for food waste and sludge

Abstract

This utility model discloses a co-treatment device for kitchen waste and sludge, including a raw water tank for mixing the kitchen waste and sludge to form a mixed liquid, an anaerobic tank, a UASB tank, a multi-functional tank, and an internal circulation pipeline. The device independently controls carbon production and methanogenesis, with corresponding anaerobic tanks and UASB tanks. Through this modular and partitioned design, technicians can adjust the hydraulic retention time and pH according to the target to achieve dynamic metabolic balance, avoiding the limitations of a single-target process, and realizing the autonomous adjustment of the metabolic balance between acid-producing bacteria and methanogenic bacteria.

Description

Technical Field

[0001] This utility model belongs to the field of environmental engineering technology, and in particular relates to a device for the co-treatment of kitchen waste and sludge. Background Technology

[0002] Food waste is high in water, oil, and salt, and contains high levels of organic matter such as starch, fat, protein, and cellulose. It is prone to rotting and producing foul odors, and it can breed viruses and pathogens, making it unsuitable for storage and transportation. Wastewater treatment plant sludge contains not only active microorganisms but also various organic and inorganic compounds, heavy metals, salts, pathogens, and parasite eggs. If not properly treated, it poses a serious threat to the environment and human health.

[0003] Anaerobic fermentation is considered an economical and effective method for biomass utilization due to its high resource recovery rate and minimal environmental impact. Both food waste and sewage sludge are rich in readily biodegradable substances and can serve as inexpensive fermentation substrates. Co-fermentation of food waste and sewage sludge can effectively improve the C / N ratio of the fermentation system, enhance its buffering capacity, reduce the inhibitory effect of toxic substances on microorganisms, and promote anaerobic metabolic processes such as the dissolution, hydrolysis, and acidification of organic matter, thereby achieving higher efficiency in acid and methanogenesis. In existing technologies, anaerobic fermentation processes for treating kitchen waste and residual sludge mostly focus on a single objective (carbon source production or methanogenesis). While combined technologies can significantly improve resource utilization efficiency (such as optimizing acid production quality and increasing biogas production), they face many technical bottlenecks in practical applications. For example, the existing technology with publication number CN109628296A can improve the efficiency of methanogenesis and simultaneously recover magnetic biochar, but it has problems in the following aspects: in terms of metabolic regulation, the difference in metabolic rates between acid-producing bacteria and methanogenic bacteria can easily lead to system imbalance; the anaerobic effluent is unstable and prone to sludge runoff; the existing devices lack shock resistance, have generally poor system stability, and low controllability / operability. Summary of the Invention

[0004] To address the problems existing in the current technology, this utility model proposes a device for the co-processing of kitchen waste and sludge.

[0005] The technical solution of this utility model is as follows:

[0006] A co-processing device for food waste and sludge includes a raw water tank for mixing the food waste and sludge to form a mixed liquid, and further includes an anaerobic tank, a UASB tank, a multi-functional tank, and an internal circulation pipeline; the anaerobic tank and the UASB tank are respectively provided with inlets connected to the outlet of the raw water tank, and are respectively provided with outlets connected to the inlet of the multi-functional tank; the anaerobic tank, the UASB tank, and the multi-functional tank are respectively provided with gas outlets connected to the inlet of an external biogas boiler;

[0007] The anaerobic tank is provided from bottom to top with a first water inlet distribution pipe for the mixed liquid, elastic packing material, and an inclined tube for settling sludge in the mixed liquid to form a first sludge layer and a first supernatant layer; the anaerobic tank is also provided with a first sludge outlet and a first sludge inlet;

[0008] The UASB tank is provided from bottom to top with a second water inlet distribution pipe for the mixed liquid and a three-phase separator for separating the mixed liquid into a second sludge layer, a second supernatant layer and a biogas layer; the UASB tank is also provided with a second sludge outlet and a second sludge inlet;

[0009] The multi-functional tank outlet outputs a carbon source to the external oxygen-deficient section;

[0010] The internal circulation pipeline includes two sets of three-way pipelines. Two of the three-way pipelines are respectively connected to the first sludge outlet and the first sludge inlet of the anaerobic tank, and the second sludge outlet and the second sludge inlet of the UASB tank. The other of the two sets of three-way pipelines is connected to the outlet of the external biogas boiler.

[0011] Furthermore, the raw water tank includes a mixing liquid zone and a kitchen waste treatment zone with an outer wall insulated. The kitchen waste treatment zone is provided with a heating water layer, a filter screen layer and a PP oil-absorbing cotton layer in sequence from the direction of kitchen waste flow.

[0012] Furthermore, the heated water layer of the food waste treatment area is connected to the outlet of the external biogas boiler.

[0013] Furthermore, the horizontal inclination angle of the inclined tube in the anaerobic tank is 55° to 65°.

[0014] Furthermore, the second water inlet distribution pipe in the UASB tank includes a main pipe and several branch pipes connected to the main pipe and radially distributed around the connection point. Each branch pipe is provided with several pipe holes, and the diameter of the several pipe holes on each branch pipe increases sequentially from the inside to the outside.

[0015] Furthermore, the elastic packing is mounted on multiple sets of vertically arranged elastic packing supports.

[0016] Furthermore, the first water inlet distribution pipe in the anaerobic tank adopts a mother-daughter pipe structure, which includes a mother pipe and several daughter pipes connected to the mother pipe and arranged parallel to the bottom of the elastic packing material and equipped with nozzles pointing upwards.

[0017] Furthermore, both the anaerobic tank and the UASB tank have an insulation layer on their outer walls.

[0018] Furthermore, one of the three-way pipes connecting the first sludge inlet of the anaerobic tank is connected to the other of the three-way pipes connecting the second sludge outlet of the UASB tank, and a shut-off valve is provided on the connecting pipe.

[0019] Furthermore, the outlet of the anaerobic tank is connected to the inlet of the UASB tank via a shut-off valve and a check valve.

[0020] Compared with the prior art, this utility model has the following beneficial effects:

[0021] This invention proposes a co-processing device for kitchen waste and sludge. The device independently controls carbon production and methanogenesis, with corresponding anaerobic tanks and UASB tanks. Through this modular and partitioned design, technicians can adjust the hydraulic retention time (HRT) and pH to achieve dynamic metabolic balance according to the target, avoiding the limitations of a single-target process and realizing the autonomous adjustment of the metabolic balance between acid-producing bacteria and methanogenic bacteria.

[0022] This utility model device is equipped with an internal circulation pipeline consisting of two sets of three-way pipes. Two of the three-way pipes in each set of the internal circulation pipeline are respectively connected to the first sludge outlet and the first sludge inlet of the anaerobic tank, and the second sludge outlet and the second sludge inlet of the UASB tank. The other end of each set of three-way pipes is connected to the outlet of an external biogas boiler. This design facilitates the circulation of sludge between the upper and lower layers of the tank using a circulation pump. On the other hand, it also uses steam from the outlet of the biogas boiler to heat the sludge. The internal circulation pipeline can promote uniform mixing of sludge and water, improve the efficiency of microbial metabolism, reduce the risk of short-circuiting and blockage, and enhance the stability of the system.

[0023] This utility model device includes first and second water inlet distribution pipes. The first water inlet distribution pipe adopts a mother-daughter pipe structure, parallel to the bottom of the elastic packing support. Radial nozzles are installed at the bottom of the center line of each group of elastic packing supports, which can evenly distribute water and agitate and flush the aging biofilm on the elastic packing. The second water inlet distribution pipe adopts a rotary layout. After the incoming water enters a main pipe, it is branched into various branch pipes at the central hub. Each branch pipe is arranged with multiple holes, and the diameter of the holes increases sequentially with the water flow direction, achieving uniform water distribution, improving reaction efficiency, and reducing sludge runoff in the effluent.

[0024] In this utility model device, the gas outlets of the anaerobic tank, UASB tank, and multi-functional tank are connected to the inlet of an external biogas boiler. At the same time, the third port of the three-way pipe in the internal circulation pipeline is connected to the outlet of the external biogas boiler, and the heating water layer of the kitchen waste treatment area is connected to the outlet of the external biogas boiler. This achieves a closed-loop insulation design, realizes energy self-sufficiency, and reduces dependence on external energy.

[0025] In this device, the elastic packing material is fixed on multiple vertically arranged elastic packing material supports. The elastic packing material is interspersed and fixed on a high-strength, corrosion-resistant central disc, which is fixed to the center line. The central disc prevents the elastic packing material from sticking together and clumping. This elastic packing material fully utilizes the tank volume, providing more space for microorganisms to attach and grow. The packing material filters layer by layer, reducing water impact, and, in conjunction with inclined tube sedimentation, minimizing sludge runoff in the effluent. Attached Figure Description

[0026] Figure 1 Schematic diagram of a co-processing device for food waste and sludge;

[0027] Figure 2 This is a schematic diagram of the inclined tube structure;

[0028] Figure 3 This is a top view of the first water inlet and distribution pipe structure;

[0029] Figure 4 This is a top view of the second water inlet distribution pipe structure.

[0030] In the diagram, 1-Self-priming non-clogging submersible pump, 2-Sludge screw pump, 3-Raw water tank, 4-Third pH meter, 5-Heated water layer, 6-Filter screen layer, 7-PP oil-absorbing cotton layer, 8-Third steam pipeline, 9-First metal diaphragm pump, 10-First inlet water distribution pipe, 11-Elastic packing, 12-Inclined pipe, 13-First rock wool insulation layer, 14-Anaerobic tank, 15-First pH meter, 16-First shut-off valve, 17-Check valve, 18-First steam pipeline, 19-First internal circulation pipeline, 20-First... 21-Second shut-off valve, 22-Second metal diaphragm pump, 23-Second inlet water distribution pipe, 24-Audible and visual explosion-proof alarm, 25-UASB tank, 26-Second rock wool insulation layer, 27-Biogas collection chamber, 28-Three-phase separator, 29-Second pH meter, 30-Second steam pipeline, 31-Second internal circulation pipeline, 32-Second circulating water distribution pump, 33-Circulating water distribution pipe, 34-Third metal diaphragm pump, 35-Multifunctional tank, 36-Static pressure level gauge, 37-Biogas boiler. Detailed Implementation

[0031] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0032] Example:

[0033] This utility model discloses a device for the co-processing of kitchen waste and sludge, such as Figure 1As shown, the system includes a raw water tank 3 for mixing kitchen waste and sludge to form a mixed liquid, an anaerobic digester 14, a UASB tank 25, a multi-functional tank 35, and an internal circulation pipeline. The anaerobic digester and UASB tank are each equipped with an inlet connected to the outlet of the raw water tank, and each has an outlet connected to the inlet of the multi-functional tank. The outlets of the anaerobic digester and UASB tank are connected to the inlet of the multi-functional tank via a pipeline equipped with a third metal diaphragm pump 34. The anaerobic digester, UASB tank, and multi-functional tank are each equipped with an outlet connected to the inlet of an external biogas boiler 37. Generally, the inlets of the anaerobic digester and UASB tank are located at the lower part of the tank body and are respectively equipped with a first metal diaphragm pump 9 and a second metal diaphragm pump 22. The outlets are located at the upper part of the tank body, and the outlets are located at the top of the tank body. The UASB tank is equipped with a biogas collection chamber 27.

[0034] The anaerobic tank is provided from bottom to top with a first water inlet distribution pipe 10 for introducing mixed liquor, an elastic packing material 11 for biological reaction, and an inclined pipe 12 for settling sludge in the mixed liquor to form a first sludge layer and a first supernatant layer; the anaerobic tank is also provided with a first sludge outlet corresponding to the upper part of the sludge layer and a first sludge inlet corresponding to the lower part of the sludge layer.

[0035] The UASB tank is equipped from bottom to top with a second inlet water distribution pipe 23 connected to the UASB tank inlet for introducing the mixed liquid and a three-phase separator 28 for separating the mixed liquid into a second sludge layer, a second supernatant layer and a biogas layer; the UASB tank is also equipped with a second sludge outlet corresponding to the upper part of the sludge layer and a second sludge inlet corresponding to the lower part of the sludge layer; the first and second sludge inlets are respectively equipped with a first circulating water distribution pump 20 and a second circulating water distribution pump 32, which are generally horizontal circulating pumps.

[0036] The multi-functional tank is equipped with a level gauge, whose outlet outputs a carbon source to an external anoxic zone or artificial wetland. Furthermore, the level gauge adopts a hydrostatic level gauge 36. Compared with commonly used ultrasonic level gauges, the hydrostatic level gauge can avoid the interference of foam and scum on the level measurement and improve the measurement accuracy.

[0037] The internal circulation pipeline includes two sets of T-junctions. Two ends of these T-junctions connect to the first sludge outlet and the first sludge inlet of the anaerobic digester, and the second sludge outlet and the second sludge inlet of the UASB tank, respectively, thus forming the first internal circulation pipeline 19 and the second internal circulation pipeline 31. The other end of each T-junction connects to an external heat source. Generally, the external heat source is the outlet of an external biogas boiler 37. The external biogas boiler 37 heats the circulating sludge in the anaerobic digester through the first steam pipeline 18 and the second steam pipeline 30. Furthermore, the UASB tank also includes a circulating water distribution pipeline 33 connected to the second sludge inlet.

[0038] In one embodiment, the raw water tank includes a food waste treatment area and a mixing liquid area. The food waste treatment area is provided with a heating water layer 5, a filter screen layer 6, and a PP oil-absorbing cotton layer 7 in sequence from the flow direction of the food waste. Generally, the filter screen layer and the PP oil-absorbing cotton layer can be detachably fixed to the inner wall of the tank by means of clips, bolts, etc., and the mesh size of the filter screen layer is about 2-6mm. Further, the food waste is pumped into the food waste treatment area by a self-priming non-clogging submersible pump 1, and then filtered and degreased by the heating water layer, filter screen layer, and PP oil-absorbing cotton layer in the food waste treatment area in sequence, before entering the mixing liquid area to mix with the sludge pumped into the mixing liquid area by the sludge screw pump 2.

[0039] The mixed liquid zone of the food waste treatment area is equipped with a third pH meter 4, and the anaerobic digester and UASB tank are equipped with a first pH meter 15 and a second pH meter 29, respectively. The pH meters in the anaerobic digester and UASB tank are located in the supernatant layer of the tank.

[0040] In one embodiment, the outlet of the external biogas boiler 37 is connected to the heating water layer of the food waste treatment area via a third steam pipeline 8.

[0041] In one embodiment, such as Figure 2 As shown, the horizontal inclination angle of the inclined tube in the anaerobic tank is 55° to 65°, and it is made of copolymer polypropylene (PP-C).

[0042] In one embodiment, the elastic packing is disposed on multiple sets of vertically arranged elastic packing supports. Each elastic packing support comprises several vertically arranged center lines and several central discs fixed to the center lines, with the elastic packing interlaced and fixed on the central discs. Generally, the elastic packing is in the form of filaments, and the central discs prevent the filaments from sticking together and clumping.

[0043] In one embodiment, such as Figure 3 As shown, the first inlet water distribution pipe in the anaerobic tank adopts a mother-daughter pipe structure, which includes a mother pipe and several daughter pipes connected to the mother pipe. These daughter pipes are arranged parallel to each other at the bottom of the elastic packing material, and each daughter pipe has a nozzle with an upward-facing nozzle. Furthermore, the nozzles on different daughter pipes are positioned correspondingly, and each nozzle can have multiple upward-facing nozzles.

[0044] In one embodiment, such as Figure 4 As shown, the second inlet water distribution pipe in the UASB tank adopts a rotary structure, including a main pipe for incoming water and several branch pipes connected to the main pipe. Each branch pipe is connected to the main pipe through a central hub as a connection point, and is distributed radially around the central hub. Each branch pipe has several pipe holes, and the diameter of the pipe holes on each branch pipe increases sequentially from the inside to the outside.

[0045] Furthermore, the top of the UASB tank is equipped with an audible and visual explosion-proof alarm 24 for real-time warning of methane concentration in the air.

[0046] In one embodiment, the outer walls of the anaerobic tank and the UASB tank are respectively provided with a first rock wool insulation layer 13 and a second rock wool insulation layer 26.

[0047] In one embodiment, one of the three-way pipes connecting the first sludge inlet of the anaerobic tank is connected to the other of the three-way pipes connecting the second sludge outlet of the UASB tank, and a second shut-off valve 21 is provided on the connecting pipe.

[0048] In one embodiment, the outlet of the anaerobic tank is connected to the inlet of the UASB tank via a first shut-off valve 16 and a check valve 17.

[0049] The method for co-processing kitchen waste and sludge using the device of this utility model is as follows:

[0050] 1) Mixture formation:

[0051] Food waste slurry is pumped into the food waste treatment area via a self-priming, non-clogging submersible pump. It then passes through a heated water layer for heating, a filter screen for sludge removal, and PP oil-absorbing cotton for oil removal. Finally, it is mixed with residual sludge pumped in by a sludge screw pump in the mixing zone. The mixing ratio can be 7:2-7:3 by volume, or adjusted according to specific circumstances. The pH of the mixed solution generally needs to be maintained between 5.5 and 6.5. Technicians can manually adjust the pH using a third pH meter, or automatically add liquid alkali based on online feedback from the third pH meter reading using existing automatic control programs.

[0052] 2) Mixed liquor anaerobic carbon source:

[0053] The mixed liquor in the raw water tank is pumped into the anaerobic tank by the first metal diaphragm pump to produce carbon from the anaerobic environment. It enters the tank through the first inlet water distribution pipe, which agitates and washes away the aging biofilm on the elastic packing material. An inclined tube is installed at the top of the anaerobic tank for sludge sedimentation. The outer wall of the anaerobic tank is wrapped with a rock wool insulation layer. The first steam pipe heats the sludge and introduces it into the tank through the first internal circulation pipe. Generally, the mixed liquor reacts in the anaerobic tank for 1-2 days, with the temperature controlled at 32-42℃, a daily temperature difference not exceeding 3℃, and the pH value controlled at 6.8-7.5. The pH value can be adjusted by reading the first pH meter.

[0054] The effluent from the anaerobic tank is pumped into the multi-functional tank via a third metal diaphragm pump. In the multi-functional tank, struvite sedimentation can be carried out. The multi-functional tank is equipped with a hydrostatic level gauge for level measurement. Finally, the effluent is used as a carbon source and enters the anoxic section (or constructed wetland) of the wastewater treatment plant.

[0055] 3) Anaerobic methanogenesis in mixed liquor:

[0056] The raw water mixture from the pool is pumped into the UASB tank via a second metal diaphragm pump for anaerobic methanogenesis. The sludge then enters the tank through a second inlet water distribution pipe. The outer wall of the UASB tank is lined with rock wool insulation. A second steam pipe heats the sludge via a second internal circulation pipe, which then feeds it into the tank. The second internal circulation pipe, through a circulating water distribution pipe, evenly distributes the activated sludge to the bottom of the tank and also flushes the second inlet water distribution pipe, reducing scaling and clogging. An audible and visual explosion-proof alarm is installed on the tank top to provide real-time warnings of methane concentration in the air. Generally, the HRT (Heat Retention Time) in the UASB tank is 15-18 days, with a controlled temperature of 32-42℃ and a daily temperature difference not exceeding 3℃. The pH is maintained at 7.5-8.0, adjustable via a second pH meter. A three-phase separator separates the sludge, biogas, and supernatant. The supernatant is pumped into a multi-functional tank via a third metal diaphragm pump for solid-liquid separation, and the final effluent enters the food waste wastewater treatment system.

[0057] 4) Autonomously adjust carbon production sources and methanogenesis based on objectives:

[0058] In cases of a sudden increase in food waste or the need for high concentrations of volatile fatty acids (VFAs), technicians can directly shorten the HRT of the UASB tank to 2-3 days, which will cause the pH to drop slightly. When restoring its methanogenic function, the HRT can be extended to 15-18 days and the pH can be appropriately increased. The specific time and pH adjustment can be based on the technician's operating experience.

[0059] In winter or cold regions, where the device and food waste treatment plant require more steam for heating, the acidified liquid from the anaerobic digester can be discharged to the UASB tank. At this point, the first shut-off valve and check valve are opened, and there is virtually no delay in the gas production stage. If high-concentration VFAs are not required at this time, the HRT of the anaerobic digester can be extended to 15-18 days. Both types of anaerobic digesters (anaerobic digester and UASB tank) in this device produce methane to meet the steam demand; the specific timing can be determined based on the operational experience of the technicians.

[0060] When one of the two anaerobic tanks experiences a shock, the first and second circulating water pumps can be activated, and the second shut-off valve can be opened to initiate internal circulation and help it recover. When the entire device needs to quickly acquire the ability to produce a carbon source or methanogen, the internal circulation system can also help the two anaerobic tanks quickly cultivate this single ability. During daily operation, provided that the effluent from the two anaerobic tanks does not contain sludge, appropriately activating the internal circulation system can help the anaerobic system react fully and improve efficiency.

[0061] The tank of this utility model is used for periodic sludge discharge. The sludge at the bottom of the raw water tank is not easy to dewater and needs to be dewatered together with the biological sludge of the device, with a volume ratio of 1:2-1:3, which can also be adjusted according to specific circumstances. The filter screen in the filter layer needs to be cleaned regularly, and the PP oil-absorbing cotton in the oil-absorbing cotton layer also needs to be replaced regularly.

[0062] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for co-processing food waste and sludge, comprising a raw water tank for mixing the food waste and the sludge to form a mixed liquid, characterized in that, It also includes an anaerobic digester, a UASB tank, a multi-functional tank, and an internal circulation pipeline; the anaerobic digester and the UASB tank are respectively provided with inlets connected to the outlet of the raw water tank, and are respectively provided with outlets connected to the inlet of the multi-functional tank; the anaerobic digester, the UASB tank, and the multi-functional tank are respectively provided with gas outlets connected to the inlet of the external biogas boiler. The anaerobic tank is provided from bottom to top with a first water inlet distribution pipe for the mixed liquid, elastic packing material, and an inclined tube for settling sludge in the mixed liquid to form a first sludge layer and a first supernatant layer; the anaerobic tank is also provided with a first sludge outlet and a first sludge inlet; The UASB tank is provided from bottom to top with a second water inlet distribution pipe for the mixed liquid and a three-phase separator for separating the mixed liquid into a second sludge layer, a second supernatant layer and a biogas layer; the UASB tank is also provided with a second sludge outlet and a second sludge inlet; The multi-functional tank outlet outputs a carbon source to the external oxygen-deficient section; The internal circulation pipeline includes two sets of three-way pipelines. Two of the three-way pipelines are respectively connected to the first sludge outlet and the first sludge inlet of the anaerobic tank, and the second sludge outlet and the second sludge inlet of the UASB tank. The other of the two sets of three-way pipelines is connected to the outlet of the external biogas boiler.

2. The co-treatment device for kitchen waste and sludge according to claim 1, characterized in that, The raw water tank includes a mixing liquid zone and a kitchen waste treatment zone with an outer wall insulated. The kitchen waste treatment zone is provided with a heating water layer, a filter screen layer and a PP oil-absorbing cotton layer in sequence from the direction of kitchen waste flow.

3. The co-treatment device for kitchen waste and sludge according to claim 2, characterized in that, The heating water layer in the kitchen waste treatment area is connected to the outlet of the external biogas boiler.

4. The co-treatment device for kitchen waste and sludge according to claim 1, characterized in that, The inclined tube in the anaerobic tank has a horizontal inclination angle of 55° to 65°.

5. The co-treatment device for kitchen waste and sludge according to claim 1, characterized in that, The second water inlet distribution pipe in the UASB tank includes a main pipe and several branch pipes connected to the main pipe and radially distributed around the connection point. Each branch pipe has several pipe holes, and the diameter of the pipe holes on each branch pipe increases sequentially from the inside to the outside.

6. The co-treatment device for kitchen waste and sludge according to claim 1, characterized in that, The elastic packing is mounted on multiple sets of vertically arranged elastic packing supports.

7. The co-treatment device for food waste and sludge according to claim 6, characterized in that, The first water inlet distribution pipe in the anaerobic tank adopts a mother-daughter pipe structure, which includes a mother pipe and several daughter pipes connected to the mother pipe and arranged parallel to the bottom of the elastic packing material and equipped with nozzles pointing upwards.

8. The co-treatment device for kitchen waste and sludge according to claim 1, characterized in that, Both the anaerobic digester and the UASB tank have thermal insulation layers on their outer walls.

9. The co-treatment device for kitchen waste and sludge according to claim 1, characterized in that, One of the three-way pipes connecting the first sludge inlet of the anaerobic tank is connected to the other three-way pipe connecting the second sludge outlet of the UASB tank, and a shut-off valve is provided on the connecting pipe.

10. The co-treatment device for food waste and sludge according to claim 1, characterized in that, The outlet of the anaerobic tank is connected to the inlet of the UASB tank via a shut-off valve and a check valve.

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