Combined sewage treatment equipment

Abstract

The combined sewage treatment equipment comprises an anaerobic tank, an anoxic tank, a first aerobic tank, a second aerobic tank and a settling tank which are communicated in sequence, a regulating reservoir is communicated with the anaerobic tank through a water inlet pipe, the settling tank is communicated with a disinfection well through a water outlet pipe, the second aerobic tank is communicated with a dosing device through a second dosing pipe, and the second dosing pipe is communicated with a water outlet pipe. The dosing device comprises a dosing barrel and an air stirring device fixedly arranged in the dosing barrel, the air stirring device comprises an air stirring blowing pipe and a control valve arranged on the air stirring blowing pipe, the air stirring blowing pipe is communicated with the aeration device, and a plurality of blowing holes are formed in the horizontal section of the air stirring blowing pipe; the blowing holes in the two sides are oppositely arranged with the vertical section of the air stirring blowing pipe as the center, the air stirring dosing device is used for replacing an original mechanical stirring device, the agent dissolving effect can be improved, the stirring strength can be controlled, the service life is long, and frequent overhaul is avoided.

Description

Technical Field

[0001] This application relates to the field of sewage treatment, and more particularly, to a combined sewage treatment device. Background Art

[0002] In rural areas, there is a lack of planning for land use and roads. The roads are narrow, making it difficult to transport integrated sewage treatment equipment into the site. In addition, the land is irregular and small, and the size of the integrated sewage treatment equipment is limited. It needs to be divided into multiple boxes for splicing or assembled on-site, resulting in increased costs and long construction periods. However, the combined sewage treatment device consists of multiple independent tanks. Each single tank is small in size and light in weight, which can be transported on any rural road and can be flexibly spliced according to the site, solving the disadvantages of the integrated sewage treatment equipment. This makes the combined sewage treatment device widely used in rural domestic sewage treatment.

[0003] Currently, the main process commonly used in combined sewage treatment equipment is the fixed-bed biofilm reactor, which uses a submersible sewage pump as the power for nitrification liquid reflux and sludge reflux, resulting in high energy consumption and difficult maintenance of the equipment. At the same time, rural domestic sewage mainly consists of washing water and kitchen water, with relatively high nitrogen and phosphorus contents. Therefore, sewage treatment equipment for rural domestic sewage needs to have strong nitrogen and phosphorus removal capabilities. However, the existing combined fixed-bed sewage treatment equipment lacks sludge discharge settings, and phosphorus in the system cannot be discharged from the system in a timely manner with the excess sludge, resulting in general phosphorus removal effects.

[0004] Chinese Patent Application Publication No. CN211497327U discloses a fixed-bed combined sewage treatment system. This invention includes a pretreatment tank, a high-load biofilm reaction tank, a low-load biofilm reaction tank, an internal reflux tank, and a sedimentation and separation tank. A nitrification liquid reflux pump and a sludge reflux pump are respectively arranged underwater in the internal reflux tank and the sedimentation and separation tank as the power for nitrification liquid reflux and sludge reflux. However, the sedimentation and separation tank is not provided with a sludge hopper and only has sludge reflux without a sludge discharge pipe, resulting in the inability to discharge sludge from the sedimentation and separation tank, and phosphorus in the excess sludge cannot be discharged from the system in a timely manner, affecting the effluent quality. At the same time, a nutrient solution standby system is set up, including a nutrient solution inflow pipe, a water pump, a stirring motor, and a stirring shaft. The entire system uses a large number of mechanical and electrical equipment, with high energy consumption, high failure rate, and difficult maintenance. In particular, the traditional mechanical stirrer is easily damaged due to the impeller being immersed in the reagent solution for a long time, resulting in frequent maintenance. Moreover, in order to avoid wear, the mechanical stirrer usually maintains a distance from the inner wall of the dosing tank, thus forming a dead zone and poor reagent dissolution effect.

[0005] Therefore, those skilled in the art need to make structural improvements to overcome the above technical problems. Summary of the Utility Model

[0006] The main purpose of the present application is to provide a combined sewage treatment device, which uses an air agitation chemical dosing device to replace the original mechanical agitation device, not only can improve the chemical dissolution effect, but also can control the agitation intensity, has a long service life, and avoids frequent maintenance.

[0007] To achieve the above object, in a first aspect, the present application provides a combined sewage treatment device connected between an adjustment tank and a disinfection well, including an anaerobic tank, an anoxic tank, a first aerobic tank, a second aerobic tank, and a sedimentation tank that are sequentially connected in communication. The adjustment tank is connected to the anaerobic tank through a water inlet pipe, and the sedimentation tank is connected to the disinfection well through a water outlet pipe. The second aerobic tank is connected to a chemical dosing device through a second chemical dosing pipe. The chemical dosing device includes a chemical dosing barrel and an air agitation device fixedly arranged in the chemical dosing barrel. The air agitation device includes an air agitation blowing pipe and a control valve arranged on the air agitation blowing pipe. The air agitation blowing pipe is connected to an aeration device, and a plurality of blowing holes are opened in the horizontal section of the air agitation blowing pipe. The directions of the blowing holes on both sides centered on the vertical section of the air agitation blowing pipe are oppositely arranged.

[0008] Further improved, a metering pump is also arranged in the chemical dosing barrel, and the metering pump is connected to the second chemical dosing pipe.

[0009] Further improved, the aeration device is connected to a main air pipe. The anaerobic tank is connected to the main air pipe through a first air pipe, the anoxic tank is connected to the main air pipe through a second air pipe, the first aerobic tank is connected to the main air pipe through a third air pipe, the second aerobic tank is connected to the main air pipe through a fourth air pipe and a fifth air pipe, and the sedimentation tank is connected to the main air pipe through a sixth air pipe.

[0010] Further improved, it also includes a sludge discharge pipe connected to a sludge storage tank. The anaerobic tank is connected to the sludge discharge pipe through a sludge return pipe, the sedimentation tank is connected to the sludge discharge pipe through a sludge suction pipe, and a second air lift assembly is arranged between the sedimentation tank and the sludge discharge pipe.

[0011] Further improved, the second aerobic tank is connected to a nitrification liquid return pipe. The nitrification liquid return pipe is connected to the anaerobic tank through a first nitrification liquid return valve, and the nitrification liquid return pipe is connected to the anoxic tank through a second nitrification liquid return valve. A first air lift assembly is arranged between the second aerobic tank and the nitrification liquid return pipe.

[0012] Further improved, suspended fillers are arranged in the anaerobic tank, the anoxic tank, the first aerobic tank, and the second aerobic tank.

[0013] Further improved, the anaerobic tank is connected to the anoxic tank through a first connecting pipe, the anoxic tank is connected to the first aerobic tank through a second connecting pipe, the first aerobic tank is connected to the second aerobic tank through a third connecting pipe, and the second aerobic tank is connected to the sedimentation tank through a fourth connecting pipe.

[0014] Further improved, a packing interception device is provided at the water inlet of the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe.

[0015] Further improved, the packing interception device is conical.

[0016] Further improved, the anoxic tank is connected with a first chemical addition pipe.

[0017] Compared with the prior art, the beneficial effect of the combined sewage treatment equipment provided by the present utility model is that by using an air stirring chemical addition device to replace the mechanical stirrer in the prior art, horizontal air blowing holes are respectively opened at both ends of the two branch pipes on both sides of the blowpipe tee, and the opening directions of the air holes on each section of the branch pipe are the same, and the opening directions of the air holes on the two sections of the branch pipes are opposite. When the control valve of the air stirring device is opened, air is blown into the blowpipe, and the air flow directions blown out from the air blowing holes of the two branch pipes are opposite. The chemical agent near the blowpipe of one branch pipe moves along the direction of the air flow, and the chemical agent flows to the opposite air blowing hole opened by the other branch pipe under the push of the air flow, and gradually forms a circular laminar flow in the chemical agent flow direction, and the chemical agent is fully mixed with water, and the stirring effect is good. The paddle of the traditional stirring should be at a certain distance from the barrel wall to avoid wearing the barrel wall of the chemical addition barrel, and this part is easy to form a dead zone, affecting the dissolution effect of the chemical agent. In addition, the control valve of the air stirring device can control the air volume entering the blowpipe according to the concentration of the solution to be configured, and then control its stirring intensity to ensure the stirring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings forming a part of this application are used to provide a further understanding of this application, making other features, objects, and advantages of this application more obvious. The schematic embodiments and descriptions of the drawings of this application are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0019] Figure 1 is a schematic diagram of the present utility model;

[0020] Figure 2 is Figure 1 the sectional view taken along line A-A of

[0021] Figure 3 is a schematic diagram of the air stirring device;

[0022] Figure 4 is a schematic diagram of the chemical addition device.

[0023] Wherein: 1. Anaerobic tank; 2. Anoxic tank; 3. First aerobic tank; 4. Second aerobic tank; 5. Sedimentation tank; 6. Inlet pipe; 7. First connecting pipe; 8. Second connecting pipe; 9. Third connecting pipe; 10. Fourth connecting pipe; 11. Outlet pipe; 12. Nitrification liquid reflux pipe; 13. Sludge suction pipe; 14. Sludge reflux pipe; 15. Sludge discharge pipe; 16. Main air pipe; 17. First air pipe; 18. Second air pipe; 19. Third air pipe; 20. Fourth air pipe; 21. Fifth air pipe; 22. Sixth air pipe; 23. First chemical addition pipe; 24. Second chemical addition pipe; 25. First valve for nitrification liquid reflux; 26. Second valve for nitrification liquid reflux; 27. Power distribution cabinet; 28. Aeration equipment; 29. Metering pump; 30. Chemical addition tank; 31. Air agitation device; 32. Filler interception device; 33. Suspended filler; 34. First air-lift assembly; 35. Second air-lift assembly; 36. Control valve; 37. Blowing pipe; 38. Blowing holes. Detailed implementation manners

[0024] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0025] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present application here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] In the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0027] Moreover, in addition to being used to represent orientation or positional relationships, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0028] In addition, the meaning of the term "plurality" should be two or more.

[0029] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will describe this application in detail with reference to the drawings and in conjunction with the embodiments.

[0030] As Figures 1-4 shown, a combined sewage treatment device is connected between an adjustment tank and a disinfection well, and includes an anaerobic tank 1, an anoxic tank 2, a first aerobic tank 3, a second aerobic tank 4, and a sedimentation tank 5 that are connected in sequence. The adjustment tank is connected to the anaerobic tank 1 through a water inlet pipe 6, and the sedimentation tank 5 is connected to the disinfection well through a water outlet pipe 11. The anoxic tank 2 is connected with a second chemical addition pipe 24, and the second aerobic tank 4 is connected with a chemical addition device through the second chemical addition pipe 24. The chemical addition device includes a chemical addition barrel and an air stirring device 31 fixedly arranged in the chemical addition barrel. The air stirring device 31 includes an air stirring blow pipe 37 and a control valve 36 arranged on the air stirring blow pipe 37. The air stirring blow pipe 37 is communicated with an aeration device. A plurality of blow holes 38 are formed in the horizontal section of the air stirring blow pipe 37, and the directions of the blow holes 38 on both sides centered on the vertical section of the air stirring blow pipe 37 are arranged oppositely.

[0031] By adopting the air stirring device 31, the failure rate of the equipment is greatly reduced, and thus the operation and maintenance cost is reduced. Horizontal blow holes 38 are respectively formed at both ends of the branch pipes on both sides of the tee of the blow pipe 37, and the opening directions of the holes on each section of the branch pipe are the same, and the opening directions of the holes on the two section of the branch pipes are opposite. When the control valve 36 of the air stirring device 31 is opened, air is blown into the blow pipe 37, and the air flow directions blown out by the blow holes 38 of the two section of the branch pipes are opposite. The chemical agent near the blow pipe 37 of one section of the branch pipe moves along the direction of the air flow, and the chemical agent flows to the opposite blow hole 38 opened by the other section of the branch pipe under the push of the air flow, so that the flow direction of the chemical agent forms a circular laminar flow, and the chemical agent is fully mixed with water, and the stirring effect is good. The paddle of the traditional stirring should be at a certain distance from the wall of the chemical addition barrel 30 to avoid wearing the wall of the barrel, and a dead zone is easily formed in this part, which affects the dissolution effect of the chemical agent. In addition, the control valve 36 of the air stirring device 31 can control the air volume entering the blow pipe 37 according to the concentration of the solution to be configured, and thus control its stirring intensity to ensure the stirring effect.

[0032] In order to achieve quantitative chemical dosing, a metering pump 29 is also provided in the chemical dosing tank. The metering pump 29 is communicated with the second chemical dosing pipe 24. The chemical dosing device uses an air stirring device 31 to replace the traditional mechanical stirrer. Since the impeller of the stirrer is immersed in the chemical solution for a long time, it is easily damaged, resulting in frequent maintenance. The stirring intensity can be flexibly adjusted through the control valve 36, and it has a more flexible and efficient stirring effect.

[0033] As Figure 1 , Figure 2 shown, the aeration device is connected with a main air pipe 16. The anaerobic tank 1 is communicated with the main air pipe 16 through a first air pipe 17. The anoxic tank 2 is communicated with the main air pipe 16 through a second air pipe 18. The first aerobic tank 3 is communicated with the main air pipe 16 through a third air pipe 19. The second aerobic tank 4 is communicated with the main air pipe 16 through a fourth air pipe 20 and a fifth air pipe 21. The sedimentation tank 5 is communicated with the main air pipe 16 through a sixth air pipe 22.

[0034] It also includes a sludge storage tank and a sludge discharge pipe 15 communicated with the sludge storage tank. The anaerobic tank 1 is communicated with the sludge discharge pipe 15 through a sludge return pipe 14. The sedimentation tank 5 is communicated with the sludge discharge pipe 15 through a sludge suction pipe 13. A second air lift assembly 35 is provided between the sedimentation tank 5 and the sludge discharge pipe 15.

[0035] The second aerobic tank 4 is communicated with a nitrification liquid return pipe 12. The nitrification liquid return pipe 12 is communicated with the anaerobic tank 1 through a first nitrification liquid return valve 25. The nitrification liquid return pipe 12 is communicated with the anoxic tank 2 through a second nitrification liquid return valve 26. A first air lift assembly is provided between the second aerobic tank 4 and the nitrification liquid return pipe 12.

[0036] As Figure 1 shown, it also includes a power distribution cabinet 27 for control.

[0037] During specific operation, sewage enters the system through the water inlet pipe 6 and passes through the anaerobic tank 1, the anoxic tank 2, the aerobic tank, and the sedimentation tank 5 in sequence. In the anoxic tank 2, part of the BOD and COD are removed, and then the organic pollutants, phosphorus, and ammonia nitrogen are removed through the first aerobic tank 3. When the influent TN ≤ 45 mg / L, the first nitrification liquid return valve 25 is closed, and the nitrification liquid in the second aerobic tank 4 is refluxed to the anoxic tank 2 through the nitrification liquid return pipe 12. The dissolved oxygen contained in the nitrification liquid makes the anoxic tank 2 in an anoxic environment, and the denitrifying bacteria carry out denitrification reaction under anoxic conditions, thereby removing the total nitrogen. When the influent TN > 45 mg / L, the first nitrification liquid return valve 25 is opened, and the second nitrification liquid return valve 26 is closed. The nitrification liquid in the second aerobic tank 4 is refluxed to the anaerobic tank 1 through the nitrification liquid return pipe 12. At this time, the anaerobic tank 1 becomes the anoxic tank 2, increasing the volume of the anoxic section to ensure the denitrification effect.

[0038] Finally, the sewage enters the sedimentation tank 5 for solid-liquid separation, thereby removing SS in the sewage. Part of the sludge in the sedimentation tank 5 is refluxed to the anaerobic tank 1 through the sludge reflux pipe 14 to ensure the microbial concentration and activity in the system. In the anaerobic tank 1, the polyphosphate-accumulating organisms release phosphorus and absorb easily degradable organic matters such as lower fatty acids. While in the aerobic tank, the polyphosphate-accumulating organisms absorb phosphorus in excess and discharge the surplus sludge through the sludge discharge pipe 15 to remove phosphorus in the system. Suspended fillers 33 are installed inside the anaerobic tank 1, anoxic tank 2 and aerobic tank, providing an attachment site for the microorganisms in the system, improving the organic load and efficiency of the system, reducing the energy consumption of sewage treatment, and the output of surplus sludge is much less than that of the conventional activated sludge process. A filler interception device 32, preferably conical, is arranged at the outlet pipe 11 of the anoxic tank 2 and aerobic tank to prevent the fillers from accumulating in the outlet pipe 11 and blocking the water flow. The first air pipe 17, second air pipe 18 and fourth air pipe 20 are respectively connected to the bottom of the anaerobic tank 1, anoxic tank 2 and second aerobic tank 4 for stirring to prevent the sludge from depositing at the bottom. The third air pipe 19 and fifth air pipe 21 are respectively connected to the aeration devices arranged in the two aerobic tanks to ensure that the microorganisms are in an aerobic growth environment. At the same time, the sludge reflux, sludge discharge and nitrification liquid reflux adopt the first air-lift component 34 and second air-lift component 35 to replace the pump as the power for reflux, reducing the overall equipment energy consumption and further reducing the maintenance workload. The inlet pipes 6 of the anaerobic tank 1, anoxic tank 2 and aerobic tank extend to the bottom of the tank body. The inlet pipe 6 is provided with a tee with an upper opening for convenient observation of the water inlet situation. The outlet pipe 11 is at the upper part of the tank body, realizing water inlet from the bottom and water outlet from the top. Combining the air stirring and aeration devices in the tank can improve the utilization rate of the tank volume and avoid the formation of dead zones in the tank body. Biological denitrification has three stages: ammonification reaction, nitrification reaction and denitrification reaction. Among them, the denitrification reaction occurs in the anoxic tank 2, where the denitrifying bacteria will use the organic carbon source for denitrification. In the present invention, a first chemical addition pipe 23 is reserved in the anoxic tank 2 to add carbon source medicament to prevent insufficient carbon source required during the denitrification process. The denitrifying bacteria use their own protoplasm for endogenous denitrification, resulting in a reduction in the cytoplasm of the bacteria and further a decrease in the denitrification rate. In the present invention, a second chemical addition pipe 24 is arranged before the sewage enters the sedimentation tank 5 to add phosphorus removal medicament, which can combine with the biological phosphorus removal process to remove most of the phosphorus in the biological treatment section. At the same time, it can improve the sedimentation performance of the activated sludge in the secondary sedimentation tank and increase the concentration of the refluxed sludge. The electrical equipment involved only includes the aeration equipment 28 and metering pump 29. The electrical equipment used is less, the daily maintenance is simple, and the energy consumption is low, and the operating cost per ton of water.

[0039] Both the nitrification liquid reflux and sludge reflux adopt air-lift devices, relying on the power of air-lift to replace the submersible sewage pump for nitrification liquid and sludge reflux; at the same time, the chemical addition device adopts an air stirring device 31. The whole system uses less electrical equipment, has low energy consumption and is simple to maintain.

[0040] In order to improve the shock resistance of the system, with good denitrification and phosphorus removal effects and a small amount of excess sludge production, suspended packing 33 is provided in the anaerobic tank 1, the anoxic tank 2, the first aerobic tank 3, and the second aerobic tank 4. Adding the suspended packing 33 provides a place for the microorganisms in the system to aggregate, improves the organic load and efficiency of the system. The system is equipped with a sludge discharge device, and at the same time, the anaerobic tank can adjust its function according to the total nitrogen concentration of the influent water, and the system has good denitrification and phosphorus removal effects.

[0041] Preferably, the anaerobic tank 1 is connected to the anoxic tank 2 through a first connecting pipe 7, the anoxic tank 2 is connected to the first aerobic tank through a second connecting pipe, the first aerobic tank 3 is connected to the second aerobic tank 4 through a third connecting pipe, and the second aerobic tank 4 is connected to the sedimentation tank 5 through a fourth connecting pipe 10.

[0042] In order to prevent the packing from blocking the pipeline, a packing interception device 32 is provided at the water inlet of the first connecting pipe 7, the second connecting pipe 8, the third connecting pipe 9, and the fourth connecting pipe 10. Preferably, the packing interception device 32 is conical.

[0043] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A combined sewage treatment equipment, connected between a regulating tank and a disinfection well, characterized in that: It comprises an anaerobic tank, an anoxic tank, a first aerobic tank, a second aerobic tank and a sedimentation tank which are connected in sequence. The regulating tank is connected to the anaerobic tank through an inlet pipe, the sedimentation tank is connected to the disinfection well through an outlet pipe, the second aerobic tank is connected to a dosing device through a second dosing pipe, the dosing device comprises a dosing barrel and an air stirring device fixedly arranged in the dosing barrel, the air stirring device comprises an air stirring blowing pipe and a control valve arranged on the air stirring blowing pipe, the air stirring blowing pipe is connected to an aeration device, a horizontal section of the air stirring blowing pipe is provided with a plurality of blowing holes, and the directions of the blowing holes on both sides of the vertical section of the air stirring blowing pipe are arranged relatively.

2. A combined sewage treatment equipment according to claim 1, characterized in that: A metering pump is also arranged in the medicine-adding barrel, and the metering pump is connected to the second medicine-adding pipe.

3. A combined sewage treatment equipment according to claim 1, characterized in that: The aeration device is connected to a main air pipe, the anaerobic tank is connected to the main air pipe through a first air pipe, the anoxic tank is connected to the main air pipe through a second air pipe, the first aerobic tank is connected to the main air pipe through a third air pipe, the second aerobic tank is connected to the main air pipe through a fourth air pipe and a fifth air pipe, and the sedimentation tank is connected to the main air pipe through a sixth air pipe.

4. A combined sewage treatment equipment according to claim 1, characterized in that: It also includes a mud discharge pipe connected to the mud storage tank, the anaerobic tank is connected to the mud discharge pipe through a sludge return pipe, the sedimentation tank is connected to the mud discharge pipe through a mud suction pipe, and a second air stripping component is arranged between the sedimentation tank and the mud discharge pipe.

5. A combined sewage treatment equipment as claimed in claim 1, characterized in that: The second aerobic tank is connected with a nitrification liquid reflux pipe, the nitrification liquid reflux pipe is connected to the anaerobic tank through a nitrification liquid reflux first valve, the nitrification liquid reflux pipe is connected to the anoxic tank through a nitrification liquid reflux second valve, and a first gas stripping component is arranged between the second aerobic tank and the nitrification liquid reflux pipe.

6. A combined sewage treatment equipment as claimed in claim 1, characterized in that: The anaerobic tank, the anoxic tank, the first aerobic tank and the second aerobic tank are all provided with suspended fillers.

7. A combined sewage treatment equipment according to claim 1, characterized in that: The anaerobic tank is connected to the anoxic tank via a first connecting pipe, the anoxic tank is connected to the first aerobic tank via a second connecting pipe, the first aerobic tank is connected to the second aerobic tank via a third connecting pipe, and the second aerobic tank is connected to the sedimentation tank via a fourth connecting pipe.

8. A combined sewage treatment device as claimed in claim 7, characterized in that: Filler intercepting devices are provided at the water inlets of the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe.

9. A combined sewage treatment device as claimed in claim 8, characterized in that: The filler intercepting device is conical.

10. The combined sewage treatment equipment according to claim 1, characterized in that: The anoxic tank is connected with a first drug adding pipe.

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