Sewage treatment device

Abstract

The utility model provides a sewage treatment device, and relates to the technical field of sewage treatment. The sewage treatment device comprises a tank body, a water inlet pipe and a water outlet pipe; a primary sedimentation regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a filter tank which are communicated in sequence are arranged in the tank body; the water inlet pipe is communicated with the primary sedimentation regulating tank, so that sewage is temporarily stored in the primary sedimentation regulating tank and then flows into the anaerobic tank for sewage treatment, and the water outlet pipe is communicated with the filtering tank, so that the treated sewage is discharged; and fillers for treating sewage are arranged in the anaerobic tank, the anoxic tank and the aerobic tank. The sewage treatment device disclosed by the utility model is beneficial to adapting to the characteristic of large rural sewage discharge fluctuation, and is energy-saving and efficient.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a sewage treatment device. Background Art

[0002] With the progress of society, sewage treatment issues have received more and more attention, among which rural sewage treatment has also made great progress.

[0003] In the existing technology, rural sewage treatment largely applies the construction specifications of urban sewage treatment facilities, and directly uses urban sewage treatment equipment to treat rural sewage.

[0004] However, rural sewage has the characteristics of small and dispersed discharge, and large fluctuations in water quality and quantity. During periods of large sewage discharge, it is easy to impact the biochemical units inside the sewage treatment device, affecting the sewage treatment effect. Utility Model Content

[0005] The present application provides a sewage treatment device to solve the problem that rural sewage discharge fluctuates greatly and is prone to impact the biochemical unit inside the sewage treatment device during periods of large sewage discharge, thereby affecting the sewage treatment effect.

[0006] The present application provides a sewage treatment device, comprising a tank, a water inlet pipe and a water outlet pipe;

[0007] The tank body is provided with a primary sedimentation regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a filtering tank which are connected in sequence; the water inlet pipe is connected with the primary sedimentation regulating tank so as to temporarily store the sewage in the primary sedimentation regulating tank and then flow into the anaerobic tank for sewage treatment; the water outlet pipe is connected with the filtering tank so as to discharge the treated sewage; the anaerobic tank, the anoxic tank and the aerobic tank are all provided with fillers for treating sewage.

[0008] In some embodiments, the aerobic tank includes a first aerobic tank and a second aerobic tank that are connected to each other, the first aerobic tank is connected to the anoxic tank, the second aerobic tank is connected to the secondary sedimentation tank, and the second aerobic tank is provided with a nitrification liquid reflux pipe, and the nitrification liquid reflux pipe is connected to the anaerobic tank.

[0009] In some embodiments, the diameters of the fillers in the anaerobic tank, the anoxic tank, and the first aerobic tank decrease sequentially.

[0010] In some embodiments, the diameter of the filler in the second aerobic tank is equal to the diameter of the filler in the anoxic tank.

[0011] In some embodiments, the primary sedimentation tank, the anaerobic tank and the anoxic tank are each provided with a first perforated aeration pipe, the first perforated aeration pipe is located at the bottom of the tank body, and the first perforated aeration pipe is used for intermittent ventilation toward the primary sedimentation tank, the anaerobic tank and the anoxic tank to stir the sewage in the primary sedimentation tank, the anaerobic tank and the anoxic tank.

[0012] In some embodiments, the volume of the first aerobic tank is greater than or equal to the volume of the second aerobic tank and less than or equal to three times the volume of the second aerobic tank.

[0013] In some embodiments, a microporous aerator is disposed at the bottom of the first aerobic tank to supply air into the first aerobic tank; and a second perforated aeration pipe is disposed at the bottom of the second aerobic tank.

[0014] In some embodiments, an overflow interception net is disposed in the first aerobic pool, the overflow interception net is disposed at the water outlet of the first aerobic pool, and the pore size of the overflow interception net is smaller than the diameter of the filler in the first aerobic pool.

[0015] In some embodiments, the anaerobic tank, the anoxic tank and the aerobic tank are all provided with a cover plate, and the cover plate is used to cover the surface of the sewage to prevent the filler from flowing out.

[0016] In some embodiments, a packing layer is disposed in the secondary sedimentation tank, and the packing layer includes a plurality of packing plates, and the plurality of packing plates are arranged obliquely.

[0017] The present application provides a sewage treatment device, which includes a tank body, an inlet pipe and an outlet pipe. The tank body is provided with a primary sedimentation regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a filter tank which are connected in sequence. The sewage enters the primary sedimentation regulating tank through the inlet pipe for temporary storage, and then is discharged into the subsequent anaerobic tank for anaerobic treatment. The sewage passes through the anaerobic tank, the anoxic tank, the aerobic tank, the secondary sedimentation tank and the filter tank in sequence, that is, the sewage is denitrified and dephosphorized by the biochemical unit to achieve sewage treatment and purification. Among them, the sewage is first temporarily stored in the primary sedimentation regulating tank, and then discharged to the subsequent treatment, which effectively reduces the impact of the large fluctuation of the water volume of rural sewage on the device, so that the sewage treatment device always maintains a reasonable treatment volume, reduces the impact on the back-end biochemical unit, and improves the stability of operation and the sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] Figure 1 A schematic diagram of the structure of a sewage treatment device provided in an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 101-tank body; 102-water inlet pipe; 103-water outlet pipe; 104-primary sedimentation tank; 105-anaerobic tank; 106-anoxic tank; 107-aerobic tank; 108-first aerobic tank; 109-second aerobic tank; 110-second sedimentation tank; 111-filtration tank; 112-nitrification liquid return pipe; 113-first perforated aeration pipe; 114-microporous aerator; 115-second perforated aeration pipe; 116-overflow interception net; 117-cover plate; 118-filling layer; 119-barrier net; 120-sludge return pipe; 121-filter box; 122-guide trough.

[0022] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0023] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0024] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] With the progress of society, sewage treatment issues have received more and more attention, among which rural sewage treatment has also made great progress. In the existing technology, rural sewage treatment largely applies the construction specifications of urban sewage treatment facilities, and directly uses urban sewage treatment equipment to treat rural sewage.

[0028] However, rural sewage has the characteristics of small and dispersed discharge, and large fluctuations in water quality and quantity. During periods of large sewage discharge, it is easy to impact the biochemical units inside the sewage treatment device, affecting the sewage treatment effect.

[0029] In order to solve the above problems, the present application provides a sewage treatment device, which includes a tank body, an inlet pipe and an outlet pipe. The tank body is provided with a primary sedimentation regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a filter tank which are connected in sequence; the sewage enters the primary sedimentation regulating tank through the inlet pipe for temporary storage, and then is discharged into the subsequent anaerobic tank for anaerobic treatment. The sewage passes through the anaerobic tank, the anoxic tank, the aerobic tank, the secondary sedimentation tank and the filter tank in sequence, that is, denitrification and phosphorus removal are carried out through a biochemical unit to achieve sewage treatment and purification; wherein the sewage is first temporarily stored in the primary sedimentation regulating tank, and then discharged into the subsequent treatment, which effectively reduces the impact of large fluctuations in the amount of rural sewage on the device, so that the sewage treatment device always maintains a reasonable treatment volume, reduces the impact on the back-end biochemical unit, and improves the stability of operation and the sewage treatment effect.

[0030] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0031] The present application provides a sewage treatment device, referring to Figure 1 The sewage treatment device includes a tank body 101, a water inlet pipe 102 and a water outlet pipe 103.

[0032] The tank body 101 is provided with a primary sedimentation regulating tank 104, an anaerobic tank 105, an anoxic tank 106, an aerobic tank 107, a secondary sedimentation tank 110 and a filter tank 111 which are connected in sequence; the water inlet pipe 102 is connected with the primary sedimentation regulating tank 104 to temporarily store the sewage in the primary sedimentation regulating tank 104 and then flow into the anaerobic tank 105 for sewage treatment; the water outlet pipe 103 is connected with the filter tank 111 to discharge the treated sewage; the anaerobic tank 105, the anoxic tank 106 and the aerobic tank 107 are all provided with fillers for treating sewage.

[0033] The tank body 101 is a horizontal structure, and a plurality of tank bodies are formed inside the tank body 101, which are sequentially arranged as a primary sedimentation and adjustment tank 104, an anaerobic tank 105, an anoxic tank 106, an aerobic tank 107, a secondary sedimentation tank 110, and a filtration tank 111. A plurality of guide grooves 122 are also arranged inside the tank body 101, and the guide grooves 122 are used to connect two adjacent tank bodies.

[0034] Furthermore, the guide groove 122 can be a circular tube, a square tube or other integrally formed channels. The water inlet end of the guide groove 122 is located at the upper end of the pool body, and the water outlet end of the guide groove 122 is located at the lower end of the pool body. The guide groove 122 can guide the water above the previous pool body to the bottom of the next pool body, so as to increase the distance that the sewage flows in a single pool body, thereby increasing the sewage treatment time and improving the sewage treatment effect.

[0035] In view of the problem of large fluctuations in the amount of rural sewage treatment, this embodiment performs preliminary storage of sewage through the setting of the primary sedimentation regulating tank 104. When the amount of sewage is large, the excess sewage is stored in the primary sedimentation regulating tank 104, and then supplied to the subsequent biochemical system for sewage treatment when the amount of sewage is small, so that the sewage treatment device always maintains a reasonable treatment capacity, reduces the impact on the back-end biochemical unit, and improves the stability of operation and the sewage treatment effect. At the same time, it also avoids the surplus treatment capacity of the sewage treatment device and reduces the energy consumption of the sewage treatment device. At the same time, through the setting of fillers, the biomass of microorganisms in the subsequent anaerobic tank 105, anoxic tank 106 and aerobic tank 107 is increased, and the sewage treatment capacity is improved to cope with the large fluctuations in rural sewage quality.

[0036] Reference Figure 1 The aerobic tank 107 includes a first aerobic tank 108 and a second aerobic tank 109 which are connected to each other. The first aerobic tank 108 is connected to the anoxic tank 106 , and the second aerobic tank 109 is connected to the secondary sedimentation tank 110 . The second aerobic tank 109 is provided with a nitrification liquid reflux pipe 112 , and the nitrification liquid reflux pipe 112 is connected to the anaerobic tank 105 .

[0037] The aerobic pool 107 is divided into a first aerobic pool 108 and a second aerobic pool 109, and the first aerobic pool 108 and the second aerobic pool 109 are also connected through the guide groove 122. In conventional sewage treatment devices, the aerobic pool 107 occupies the largest volume, and the sewage is generally treated by aerobic microorganisms at the front end of the aerobic pool 107, so that the sewage treatment effect of the second half of the aerobic pool 107 is relatively weak; therefore, after the aerobic pool 107 is divided into the first aerobic pool 108 and the second aerobic pool 109, the sewage is mainly concentrated in the first aerobic pool 108 for decomposition reaction, and then flows into the second aerobic pool 109 for further decomposition, and the oxygen consumption in the second aerobic pool 109 is less, which can reduce the aeration amount, thereby reducing the energy consumption of the sewage treatment device. It can also reduce the volume of the device.

[0038] The nitrification liquid return pipe 112 extends to the bottom of the second aerobic tank 109, and the nitrification liquid return pipe 112 is inserted in the second aerobic tank 109. While ensuring the nitrification liquid return, the oxygen content of the return liquid can be reduced to provide an anoxic environment in the anoxic tank 106. In addition, the nitrification liquid in the nitrification liquid return pipe 112 is returned to the anoxic tank 106 by the air pressure generated in the second aerobic tank 109.

[0039] In some embodiments, the diameters of the fillers in the anaerobic tank 105 , the anoxic tank 106 , and the first aerobic tank 108 decrease in sequence.

[0040] Fillers are added to the anaerobic tank 105, the anoxic tank 106 and the aerobic tank 107 so that the sludge and microorganisms can be attached to the fillers, the contact area between the microorganisms and the sludge is increased, and the sludge accumulation is reduced, so that the fluidization effect is more sufficient. And the diameter of the fillers decreases from the anaerobic tank 105 to the first aerobic tank 108. In order to improve the contact effect between the microorganisms and the sludge in the first aerobic tank 108, more sludge and microorganisms are attached to the fillers, and the fluidization effect is more sufficient.

[0041] In some embodiments, the diameter of the filler in the second aerobic tank 109 is equal to the diameter of the filler in the anoxic tank 106 .

[0042] The diameter of the filler in the second aerobic tank 109 is larger than that in the first aerobic tank 108, so as to reduce the investment of the filler cost. In addition, the sewage has been fully reacted in the first aerobic tank 108, and only plays a supplementary role in the second aerobic tank 109. Therefore, the diameter of the filler can be appropriately increased. At the same time, the diameter of the filler in the second aerobic tank 109 and the anoxic tank 106 is the same, so even if the filler in the second aerobic tank 109 flows into the anoxic tank 106 from the nitrification liquid return pipe 112, it will not cause confusion of the filler.

[0043] Exemplarily, the fillers in the anaerobic tank 105, the anoxic tank 106 and the second aerobic tank 109 are all suspended spherical structures, such as one or two of honeycomb suspended porous fillers or polyurethane sponge fillers. In addition, the filling rate of the fillers in the anaerobic tank 105, the anoxic tank 106 and the second aerobic tank 109 is 25% to 50%.

[0044] The filler in the first aerobic pool 108 is polyurethane sponge, and the filling rate of the filler in the first aerobic pool 108 is 30% to 50%.

[0045] The polyurethane sponge can be better suspended in the first aerobic tank 108 to attach microorganisms and sludge, further improving the fluidization effect. It is also beneficial to set the filler to a smaller diameter and improve the filling rate.

[0046] Exemplarily, the diameter of the filler in the anaerobic tank 105 is 120 mm to 160 mm, the diameter of the filler in the anoxic tank 106 and the second aerobic tank 109 is 80 mm to 120 mm, and the diameter of the filler in the first aerobic tank 108 is 30 mm to 50 mm.

[0047] The tank body 101 is also provided with a plurality of inspection ports, which are arranged one by one with each tank body, and are located at the top of the tank body 101. The inspection ports are provided with end covers for opening and closing the inspection ports. Therefore, a single tank body can be inspected and maintained through the inspection ports.

[0048] In some embodiments, reference Figure 1 , the volume of the first aerobic tank 108 is greater than or equal to the volume of the second aerobic tank 109 and less than or equal to three times the volume of the second aerobic tank 109 .

[0049] The first aerobic tank 108 has a relatively large volume, which is beneficial to ensuring the residence time of the sewage in the first aerobic tank 108, so as to ensure that the sewage is fully reacted in the first aerobic tank 108 and improve the treatment effect of the sewage.

[0050] In some embodiments, a first perforated aeration pipe 113 is provided in the primary settling tank 104, the anaerobic tank 105 and the anoxic tank 106. The first perforated aeration pipe 113 is located at the bottom of the tank body 101. The first perforated aeration pipe 113 is used for intermittent ventilation toward the primary settling tank 104, the anaerobic tank 105 and the anoxic tank 106 to stir the sewage in the primary settling tank 104, the anaerobic tank 105 and the anoxic tank 106.

[0051] Specifically, an air pump is provided on the tank body 101, and a plurality of first perforated aeration tubes 113 are all connected to the air pump, and a control valve assembly is provided at the connection end between each first perforated aeration tube 113 and the air pump. A controller is also provided on the tank body 101, and the control valve assembly is electrically connected to the controller to control the opening and closing of each first perforated aeration tube 113 through the controller. This is to achieve control of the ventilation volume and ventilation time. Furthermore, a timer can also be set on the controller to supply air to each first perforated aeration tube 113 at a regular time according to the set time of the timer, and set the corresponding air supply time.

[0052] The first perforated aeration pipe 113 is provided with a plurality of air holes on the pipe to pass gas into the corresponding tank body. When aeration is conducted toward the primary sedimentation regulating tank 104, the anaerobic tank 105 and the anoxic tank 106, the flow of sewage in the primary sedimentation regulating tank 104, the anaerobic tank 105 and the anoxic tank 106 is agitated, and the sludge accumulated at the bottom can be flushed and mixed into the sewage, thereby achieving the mixing of the sewage.

[0053] The first perforated aeration pipe 113 is used to stir the sewage, thereby reducing the need for the stirrer. The air pump is a necessary device for aeration of the sewage treatment device, thereby reducing the cost and power consumption of the sewage treatment device. In addition, the first perforated aeration pipe 113 uses intermittent jetting toward the anaerobic tank 105 and the anoxic tank 106, so that the anaerobic and anoxic environments in the anaerobic tank 105 and the anoxic tank 106 are not damaged, and only the stirring effect is achieved.

[0054] Reference Figure 1 A microporous aerator 114 is provided at the bottom of the first aerobic tank 108 to supply air to the first aerobic tank 108 ; a second perforated aeration pipe 115 is provided at the bottom of the second aerobic tank 109 .

[0055] Specifically, the microporous aerator 114 is connected to the air pump. Similarly, a control valve assembly is provided at the connection end between the microporous aerator 114 and the air pump to adjust and open and close the gas volume of the microporous aerator 114. The microporous aerator 114 can divide the gas in the air pipe into smaller bubbles for discharge, thereby increasing the contact area between air and sewage, allowing more oxygen to dissolve in the sewage to increase the dissolved oxygen content of the sewage and improve the oxygen mass transfer efficiency. In turn, the activity of the microorganisms in the first aerobic tank 108 is improved, and a better sewage treatment effect is achieved.

[0056] The second perforated aeration pipe 115 is also connected to the air pump, and a control valve assembly is also provided at the connection end between the second perforated aeration pipe 115 and the air pump. In the second aerobic pool 109, since the oxygen demand in the second aerobic pool 109 is relatively small, the demand can be met by simply introducing air into the second aerobic pool 109 through the second perforated aeration pipe 115, thereby reducing the number of microporous aerators 114 and reducing the cost of the device.

[0057] In some embodiments, an overflow interception net 116 is disposed in the first aerobic tank 108 . The overflow interception net 116 is disposed at the water outlet of the first aerobic tank 108 . The pore size of the overflow interception net 116 is smaller than the diameter of the filler in the first aerobic tank 108 .

[0058] The overflow interception net 116 is arranged at the water inlet of the guide groove 122 of the water outlet of the first aerobic tank 108. The aperture of the overflow interception net 116 is smaller than the diameter of the filler in the first aerobic tank 108 to block the filler in the first aerobic tank 108, prevent the filler in the first aerobic tank 108 from flowing into the second aerobic tank 109, and avoid mixing of the filler.

[0059] In some embodiments, a cover plate 117 is disposed in each of the anaerobic tank 105 , the anoxic tank 106 , and the aerobic tank 107 . The cover plate 117 is used to cover the surface of the sewage to prevent the filler from flowing out.

[0060] The cover plate 117 covers the surface of the sewage to prevent the filler in the sewage from flowing out into the next tank body, reducing the loss of the filler, and can press the filler into the sewage to increase the mixing degree of the sewage mixture and the filler, thereby enhancing the treatment effect.

[0061] Furthermore, a blocking net 119 is provided on the guide channel 122 between the anoxic pool 106 and the first aerobic pool 108, and the blocking net 119 is provided at the outlet end of the guide channel 122. The pores of the blocking net 119 are smaller than the diameter of the filler in the first aerobic pool 108, so as to prevent the filler in the first aerobic pool 108 from entering the anoxic pool 106 at the front end from the guide channel 122 during the aeration process of the first aerobic pool 108.

[0062] In some embodiments, a packing layer 118 is disposed in the secondary sedimentation tank 110 . The packing layer 118 includes a plurality of packing plates, and the plurality of packing plates are arranged in an inclined manner.

[0063] The packing plates are used to fix the packing, and the packing plates are stacked downwardly in an inclined manner to form a packing layer 118. The inclined packing plates can filter and block suspended particles, so that the discharged water is purer.

[0064] Exemplarily, the packing layer 118 may also be formed by stacking obliquely arranged pipes.

[0065] A sludge return pipe 120 is provided on the secondary sedimentation tank 110, and the sludge return pipe 120 extends to the anaerobic tank 105. The sludge return pipe 120 is located at one end of the secondary sedimentation tank 110 and extends to the bottom of the secondary sedimentation tank 110. The sludge return pipe 120 is located at one end of the anaerobic tank 105 and extends to the bottom of the cover plate 117, and is located at the front end of the anaerobic tank 105. The sludge return method in the sludge return pipe 120 is also to use the air pressure in the secondary sedimentation tank 110 to flush the sludge into the anaerobic tank 105 through the sludge return pipe 120.

[0066] A filter box 121 is provided in the filter pool 111, wherein the water outlet of the guide groove 122 on the filter pool 111 directly extends to the bottom of the filter pool 111 and is connected to the filter box 121. The treated water is filtered by the filter box 121 and then stored in the filter pool 111 for sedimentation, and then overflows and is discharged from the outlet pipe 103.

[0067] The present application provides a sewage treatment device, in which sewage enters a primary sedimentation regulating tank 104 through a water inlet pipe 102 for temporary storage, and is then discharged into a subsequent anaerobic tank 105 for anaerobic treatment. The sewage passes through the anaerobic tank 105, the anoxic tank 106, the aerobic tank 107, the secondary sedimentation tank 110 and the filter tank 111 in sequence, that is, denitrification and dephosphorization are carried out through a biochemical unit to achieve sewage treatment and purification; wherein the sewage first passes through the primary sedimentation regulating tank 104 for temporary storage, and is then discharged into subsequent treatment, which effectively reduces the impact of large fluctuations in the amount of rural sewage on the device, so that the sewage treatment device always maintains a reasonable treatment volume, reduces the impact on the back-end biochemical unit, and improves the stability of operation and the sewage treatment effect.

[0068] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0069] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A sewage treatment device, characterized in that: It includes a tank body, a water inlet pipe and a water outlet pipe; The tank body is provided with a primary sedimentation regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a filtering tank which are connected in sequence; the water inlet pipe is connected with the primary sedimentation regulating tank so as to temporarily store the sewage in the primary sedimentation regulating tank and then flow into the anaerobic tank for sewage treatment; the water outlet pipe is connected with the filtering tank so as to discharge the treated sewage; the anaerobic tank, the anoxic tank and the aerobic tank are all provided with fillers for treating sewage.

2. The sewage treatment device according to claim 1, characterized in that: The aerobic tank comprises a first aerobic tank and a second aerobic tank which are connected to each other. The first aerobic tank is connected to the anoxic tank, the second aerobic tank is connected to the secondary sedimentation tank, and a nitrification liquid return pipe is arranged on the second aerobic tank, and the nitrification liquid return pipe is connected to the anaerobic tank.

3. The sewage treatment device according to claim 2, characterized in that: The diameters of the fillers in the anaerobic tank, the anoxic tank and the first aerobic tank decrease in sequence.

4. The sewage treatment device according to claim 3, characterized in that: The diameter of the filler in the second aerobic tank is equal to the diameter of the filler in the anoxic tank.

5. The sewage treatment device according to claim 2, characterized in that: The primary sedimentation regulating tank, the anaerobic tank and the anoxic tank are each provided with a first perforated aeration pipe, the first perforated aeration pipe is located at the bottom of the tank body, and the first perforated aeration pipe is used for intermittently ventilating the primary sedimentation regulating tank, the anaerobic tank and the anoxic tank to stir the sewage in the primary sedimentation regulating tank, the anaerobic tank and the anoxic tank.

6. The sewage treatment device according to claim 2, characterized in that: The volume of the first aerobic tank is greater than or equal to the volume of the second aerobic tank and less than or equal to three times the volume of the second aerobic tank.

7. The sewage treatment device according to claim 2, characterized in that: A microporous aerator is disposed at the bottom of the first aerobic tank to supply air to the first aerobic tank; a second perforated aeration pipe is disposed at the bottom of the second aerobic tank.

8. The sewage treatment device according to claim 2, characterized in that: An overflow interception net is arranged in the first aerobic pool. The overflow interception net is arranged at the water outlet of the first aerobic pool. The aperture of the overflow interception net is smaller than the diameter of the filler in the first aerobic pool.

9. The sewage treatment device according to any one of claims 1 to 8, characterized in that: The anaerobic tank, the anoxic tank and the aerobic tank are all provided with cover plates, and the cover plates are used to cover the surface of the sewage to prevent the filler from flowing out.

10. The sewage treatment device according to any one of claims 1 to 8, characterized in that: A packing layer is arranged in the secondary sedimentation tank, and the packing layer includes a plurality of packing plates, and the plurality of packing plates are arranged in an inclined manner.

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