Sewage treatment device

Abstract

The utility model discloses a sewage treatment device. The sewage treatment device comprises an aeration tank, a two-way pump, a pipe group and filtering equipment, the pipe group comprises a liquid inlet pipe group and a liquid outlet pipe group, and the two-way pump is mounted on the liquid outlet pipe group. The filtering equipment comprises a mounting main body, at least one filtering mechanism and a locking piece, the filtering mechanism comprises a shell and a filtering bag, the shell forms a mounting cavity, the filtering bag is detachably mounted in the mounting cavity, the filtering bag forms a filtering cavity, the liquid inlet pipe group is connected with the filtering cavity formed by the filtering bag, and the locking piece is connected with the liquid inlet pipe group. Sewage mixed with a flocculating agent flows to the filter cavity through the liquid inlet pipe group, the filter bag allows water in the filter cavity to seep, and the mounting cavity formed by the shell and the aeration tank are connected with the liquid outlet pipe group. The two-way pump is arranged to guide water in the aeration tank to the mounting cavity or guide water in the mounting cavity to the aeration tank.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment equipment technical field especially sewage treatment device. BACKGROUND

[0002] The flocculant is widely used in the sewage treatment field, and after the flocculant is put into the sewage, the suspended matter in the sewage combines with the flocculant to produce flocculation which is convenient for filtering, and then a filtering mechanism is used for filtering to filter out the flocculation.

[0003] The existing filtering mechanism is provided with a shell and a filter bag, and the sewage reacted with the flocculant is injected into the filter bag, and after being filtered through the filter bag, the flocculation can be removed. Due to long-time use of the filter bag, a large amount of flocculation is attached to the inner wall of the filter bag, causing the filter hole of the filter bag to be blocked, water cannot seep out, and the filtering efficiency of the filtering device is too low or cannot filter. Therefore, the filter bag that has been blocked needs to be replaced manually, and the filtering mechanism needs to be stopped to ensure that no sewage is injected during the replacement process, thereby causing the filtering efficiency of the existing filtering mechanism to be low, and frequent replacement of the filter bag not only reduces the filtering efficiency but also increases the workload of workers. SUMMARY

[0004] To solve the above technical problems and achieve at least one advantage of the utility model, the utility model provides a sewage treatment device, which comprises:

[0005] An aeration tank;

[0006] A bidirectional pump;

[0007] A pipe group, which comprises an inlet pipe group and an outlet pipe group, and the bidirectional pump is installed on the outlet pipe group;

[0008] A filtering device, which comprises a mounting body, at least one filtering mechanism and a locking piece, the filtering mechanism comprises a shell and a filter bag, the shell forms a mounting cavity, the filter bag is detachably installed in the mounting cavity, and the filter bag forms a filtering cavity, the inlet pipe group is connected to the filtering cavity formed by the filter bag, the sewage mixed with the flocculant flows to the filtering cavity through the inlet pipe group, the filter bag allows water in the filtering cavity to seep out, the mounting cavity formed by the shell is connected to the outlet pipe group and the aeration tank, the bidirectional pump is arranged to be capable of guiding water in the aeration tank to the mounting cavity or guiding water in the mounting cavity to the aeration tank, the mounting body comprises a fixing piece and an elastic piece, the elastic piece is connected to the fixing piece, the shell is swingably connected to the elastic piece, the fixing piece forms a threaded channel, and the locking piece is screw-installed in the threaded channel. The shell is lockably installed in the locking piece in a manner capable of being unlocked.

[0009] According to an embodiment of the present application, the locking member forms a threaded groove, the outer periphery of the housing forms an external thread matched with the threaded groove, the locking member has a preset length, the locking member is assembled with the fixing member, and the housing can be screwed out of or into the threaded groove formed by the locking member.

[0010] According to an embodiment of the present application, the sewage treatment device further comprises a pretreatment unit, the pretreatment unit further comprises a suspended matter removing mechanism, the suspended matter removing mechanism further comprises a second mixing member, the second mixing member forms a second mixing cavity, the second mixing cavity formed by the second mixing member is arranged to be capable of being injected with a flocculating agent, and the second mixing cavity formed by the second mixing member and the filter cavity formed by the filter bag are connected with the liquid inlet pipe group.

[0011] According to an embodiment of the present application, the suspended matter removing mechanism further comprises a second supply member, the second supply member comprises a storage tank, the storage tank is used for storing the flocculating agent, the storage tank is in communication with the second mixing cavity formed by the second mixing member through a pipeline, and the flocculating agent stored in the storage tank is injected into the second mixing cavity through the pipeline.

[0012] According to an embodiment of the present application, the pretreatment unit further comprises a phosphorus removing mechanism, the phosphorus removing mechanism comprises a first mixing member, the first mixing member forms a first mixing cavity, the second mixing cavity formed by the second mixing member is in communication with the first mixing cavity formed by the first mixing member through a pipeline, sewage treated by the phosphorus removing mechanism is injected into the second mixing cavity through the pipeline, and the first mixing cavity is arranged to be capable of being injected with a phosphorus removing agent.

[0013] According to an embodiment of the present application, the phosphorus removing mechanism further comprises a first supply member, the first supply member comprises a phosphorus storage tank, the phosphorus storage tank is used for storing the phosphorus removing agent, the phosphorus storage tank is in communication with the first mixing cavity formed by the first mixing member through a pipeline, and the phosphorus removing agent stored in the phosphorus storage tank is injected into the first mixing cavity through the pipeline.

[0014] According to an embodiment of the present application, the pretreatment unit comprises a foreign matter removing mechanism, the foreign matter removing mechanism comprises a storage pool and a foreign matter removing member, the foreign matter removing member is installed on the storage pool and divides a space formed by the storage pool into a sewage chamber and a transition chamber, sewage is introduced into the sewage chamber, the foreign matter removing member forms a plurality of through holes, and the sewage introduced into the sewage chamber flows to the transition chamber through the through holes, solid substances mixed in the sewage are intercepted in the sewage chamber, the first mixing cavity formed by the first mixing member and the transition chamber are in communication through a pipeline, and the sewage removed of foreign matters and flowing to the transition chamber is discharged into the first mixing cavity through the pipeline.

[0015] According to an embodiment of the present application, the sewage treatment device further comprises a valve group, the valve group comprises a plurality of liquid inlet control valves, the filtering mechanism is provided in plurality, the liquid inlet pipe group comprises a plurality of liquid inlet pipes, the second mixing member and each of the filtering bags are communicated with one of the liquid inlet pipes, each of the liquid inlet control valves is installed on one of the liquid inlet pipes, and the liquid inlet control valves control the on-off of each flow path and the flow rate.

[0016] According to an embodiment of the present application, the liquid outlet pipe group comprises a plurality of liquid outlet branch pipes and a liquid outlet main pipe, each of the housings provided by the filtering mechanism is connected with one of the liquid outlet branch pipes, the liquid outlet main pipe is connected with the aeration tank, and all of the liquid outlet branch pipes are connected with the liquid outlet main pipe.

[0017] According to an embodiment of the present application, the bidirectional pump is provided in single, the bidirectional pump is installed on the liquid outlet main pipe, the valve group further comprises a plurality of liquid outlet control valves, each of the liquid outlet branch pipes is installed with one of the liquid outlet control valves, and the water filtered by each of the filtering mechanisms flows to the aeration tank through the corresponding passage. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The structural schematic diagram of the sewage treatment device is shown.

[0019] Figure 2 The sectional view of the sewage treatment device is shown.

[0020] Figure 3 The structural schematic diagram of the A part in the middle is shown. Figure 1

[0021] Figure 4 The structural schematic diagram of the B part in the middle is shown. Figure 1

[0022] The structural schematic diagram of the C part in the middle is shown. Figure 5 DETAILED DESCRIPTION Figure 2 The following description is used to disclose the present application so that those skilled in the art can implement the present application. The preferred embodiments in the following description are only used as examples, and other obvious modifications can be thought by those skilled in the art. The basic principles of the present application defined in the following description can be applied to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0023] The following description is used to disclose the present application so that those skilled in the art can implement the present application. The preferred embodiments in the following description are only used as examples, and other obvious modifications can be thought by those skilled in the art. The basic principles of the present application defined in the following description can be applied to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0024] ​​Those skilled in the art shall understand that in the disclosure of the utility model, the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the utility model.

[0025] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0026] Reference Figures 1 to 5 According to a preferred embodiment of the utility model, the sewage treatment device will be described in detail below, which comprises a pretreatment unit 10.

[0027] The pretreatment unit 10 comprises a dedusting mechanism 11, and the dedusting mechanism 11 comprises a liquid storage tank 111 and a dedusting element 112. The dedusting element 112 is installed on the liquid storage tank 111 and divides the space formed by the liquid storage tank 111 into a sewage chamber 1101 and a transition chamber 1102. Sewage is introduced into the sewage chamber 1101. The dedusting element 112 forms a plurality of through holes 11201, and the sewage introduced into the sewage chamber 1101 flows to the transition chamber 1102 through the through holes 11201, and the solid substances mixed in the sewage are intercepted in the sewage chamber 1101, so that the sewage realizes dedusting during flowing from the sewage chamber 1101 to the transition chamber 1102.

[0028] Preferably, the liquid storage tank 111 forms a cleaning port 1103 in communication with the sewage chamber 1101, so that the staff can clean the solid substances intercepted by the dedusting element 112 through the cleaning port 1103.

[0029] In an example, the dedusting element 112 is implemented as a grid or filter screen.

[0030] Further, the pretreatment unit 10 further comprises a phosphorus removal mechanism 12.

[0031] The phosphorus removal mechanism 12 comprises a first mixing member 121, which forms a first mixing cavity 12101. The first mixing cavity 12101 formed by the first mixing member 121 and the transition chamber 1102 are connected by a pipeline, and the sewage after impurity removal in the transition chamber 1102 is discharged into the first mixing cavity 12101 through the pipeline. The first mixing cavity 12101 is configured to be capable of adding phosphorus removal agent, and the phosphorus removal agent added into the first mixing cavity 12101 is mixed and reacted with the sewage after impurity removal in the first mixing cavity 12101, to generate precipitates insoluble in water, so as to facilitate subsequent removal of the precipitates to reduce the phosphorus content in the water.

[0032] It is worth mentioning that a pump is installed on the pipeline connecting the first mixing cavity 12101 formed by the first mixing member 121 and the transition chamber 1102, and the pump guides the sewage in the transition chamber 1102 to the first mixing cavity 12101, and under the action of the pump, the sewage in the sewage chamber 1101 actively flows to the transition chamber 1102, thereby accelerating the impurity removal speed.

[0033] Preferably, the phosphorus removal mechanism 12 further comprises a first supply member 122. The first supply member 122 comprises a phosphorus storage tank 1221 for storing phosphorus removal agent. The phosphorus storage tank 1221 is connected to the first mixing cavity 12101 formed by the first mixing member 121 through a pipeline. The phosphorus removal agent stored in the phosphorus storage tank 1221 is injected into the first mixing cavity 12101 through the pipeline, so that the phosphorus removal agent is mixed with the sewage after impurity removal in the first mixing cavity 12101 to generate precipitates insoluble in water, thereby reducing the phosphorus content in the sewage.

[0034] As a preferred embodiment, the first supply member 122 further comprises a supply pump 1222. The supply pump 1222 is installed on the pipeline connecting the phosphorus storage tank 1221 and the first mixing member 121, and the supply pump 1222 is configured to be capable of delivering the phosphorus removal agent stored in the phosphorus storage tank 1221 to the first mixing cavity 12101.

[0035] In a preferred embodiment, the supply pump 1222 is implemented as a metering pump. The supply pump 1222 is configured to be capable of controlling the dosage of the phosphorus removal agent added into the first mixing cavity 12101 according to the flow rate of the sewage after impurity removal flowing into the first mixing cavity 12101.

[0036] Further, the pretreatment unit 10 further comprises a suspended matter removal mechanism 13.

[0037] The suspended substance removing mechanism 13 further comprises a second mixing member 131, which forms a second mixing cavity 13101. The second mixing cavity 13101 formed by the second mixing member 131 is arranged to be able to be injected with flocculant. The second mixing cavity 13101 formed by the second mixing member 131 is in communication with the first mixing cavity 12101 formed by the first mixing member 121 through a pipeline, so that the sewage treated by the phosphorus removing mechanism 12 is injected into the second mixing cavity 13101 through the pipeline, and the flocculant injected into the second mixing cavity 13101 coagulates with the suspended substance in the sewage to form flocculation with larger volume, facilitating subsequent filtration of the flocculation.

[0038] Preferably, the suspended substance removing mechanism 13 further comprises a second supply member 132. The second supply member 132 comprises a storage tank 1321 for storing flocculant. The storage tank 1321 is in communication with the second mixing cavity 13101 formed by the second mixing member 131 through a pipeline. The flocculant stored in the storage tank 1321 is injected into the second mixing cavity 13101 through the pipeline, so that the flocculant is mixed with the sewage in the second mixing cavity 13101.

[0039] As a preference, the second supply member 132 further comprises a delivery pump 1322. The delivery pump 1322 is installed on the pipeline communicating the storage tank 1321 and the second mixing member 131, and is arranged to be able to deliver the flocculant stored in the storage tank 1321 to the second mixing cavity 13101.

[0040] In an example, the delivery pump 1322 is implemented as a metering pump. The delivery pump 1322 is arranged to be able to control the dosage of the flocculant injected into the second mixing cavity 13101 according to the flow rate of the sewage flowing into the second mixing cavity 13101.

[0041] Further, the sewage treatment device further comprises a filtering equipment 20, an aeration tank 30, a bidirectional pump 40, and a pipe group 50.

[0042] Specifically, the filtering device 20 comprises a mounting body 21, at least one filtering mechanism 22 and a locking member 23. The pipe set 50 comprises an inlet pipe set 51 and an outlet pipe set 52. The filtering mechanism 22 comprises a shell 221 and a filtering bag 222. The shell 221 forms a mounting cavity 22101, the filtering bag 222 is detachably mounted in the mounting cavity 22101, and the filtering bag 222 forms a filtering cavity 22201. The mounting cavity 22101 formed by the shell 221 is connected with the outlet pipe set 52 of the aeration tank 30. The bidirectional pump 40 is mounted on the outlet pipe set 52, and the bidirectional pump 40 is configured to guide water in the aeration tank 30 to the mounting cavity 22101 or guide water in the mounting cavity 22101 to the aeration tank 30. The mounting body 21 comprises a fixing member 211 and an elastic member 212. The elastic member 212 is connected with the fixing member 211, and the shell 221 is swingably connected with the elastic member 212. The fixing member 211 forms a threaded passage 21101, and the locking member 23 is threadedly mounted in the threaded passage 21101. The shell 221 is lockably mounted on the locking member 23 in an unlockable manner. The second mixing cavity 13101 formed by the second mixing member 131 and the filtering cavity 22201 formed by the filtering bag 222 are both connected with the inlet pipe set 51, and the sewage mixed with flocculants flows to the filtering cavity 22201 through the pipeline. The filtering bag 222 allows water in the filtering cavity 22201 to seep out.

[0043] In this way, the shell 221 is fixed by the locking member 23, the flocculants are filtered by the filtering bag 222 and retained in the filtering cavity 22201, and water seeps into the mounting cavity 22101. The water in the mounting cavity 22101 is pumped by the bidirectional pump 40 and discharged to the aeration tank 30. When the shell 221 is unlocked, the bidirectional pump 40 draws water in the aeration tank 30 to the mounting cavity 22101. Under the action of water flow, the filtering mechanism 22 swings relative to the fixing member 211 through the elastic member 212, so that the flocculants attached to the inner wall of the filtering cavity 22201 fall to the bottom of the filtering bag 222, the filtering bag 222 is cleaned, the filtering function of the filtering bag 222 is restored, and the filtering bag 222 is prevented from being frequently replaced.

[0044] In an example, the elastic member 212 is implemented as a spring.

[0045] In one embodiment, the locking member 23 forms a threaded groove 2301, and the outer periphery of the shell 221 forms a mating external thread with the threaded groove 2301. The locking member 23 has a preset length, and when the locking member 23 is moved in a direction of being screwed into or out of the threaded passage 21101, the locking member 23 remains fitted with the fixing member 211, and the shell 221 can be screwed into or out of the threaded groove 2301 formed by the locking member 23, so that the locking member 23 locks or unlocks the shell 221.

[0046] Specifically, when the locking member 23 is moved in a direction of being screwed out of the threaded passage 21101, the shell 221 is screwed into the threaded groove 2301, and when the shell 221 is locked, the locking member 23 remains threadedly connected with the fixing member 211; when the locking member 23 is moved in a direction of being screwed into the threaded passage 21101, the shell 221 is gradually screwed out of the threaded groove 2301 until being unlocked, and the shell 221 can drive the filter bag 222 to swing relative to the fixing member 211, so as to clean the filter bag 222.

[0047] Further, the sewage treatment device further comprises a valve group 60, and the valve group 60 comprises a plurality of liquid inlet control valves 61.

[0048] The plurality of filter mechanisms 22 are provided. The liquid inlet pipe group 51 comprises a plurality of liquid inlet pipes 511, and the second mixing member 131 and each filter bag 222 are communicated with one liquid inlet pipe 511. Each liquid inlet control valve 61 is respectively installed on one liquid inlet pipe 511 and respectively controls the on-off state and flow rate of each flow path.

[0049] In a preferred embodiment, at least one liquid inlet control valve 61 is in a closed state, and the remaining liquid inlet control valves 61 are in an open state. In this way, the sewage mixed with the flocculating agent is injected into the filter mechanism 22 connected with the liquid inlet pipe 511 in which the flow path is in a connected state, so as to be filtered. When the filter mechanism 22 is blocked by flocculation, the liquid inlet control valve 61 provided on the liquid inlet pipe 511 connected with the filter mechanism 22 is closed. The liquid inlet control valve 61 originally in a closed state is opened, so that the remaining filter mechanisms 22 can normally operate, so that the filter device 20 can continuously work, and the filtering efficiency is improved.

[0050] The liquid outlet pipe group 52 comprises a plurality of liquid outlet branch pipes 521 and a liquid outlet main pipe 522. The shell 221 provided on each filter mechanism 22 is connected with one liquid outlet branch pipe 521, and the liquid outlet main pipe 522 is connected with the aeration tank 30. All the liquid outlet branch pipes 521 are connected with the liquid outlet main pipe 522.

[0051] In an embodiment, a plurality of said bidirectional pumps 40 are provided, each of said bidirectional pumps 40 is installed on a said liquid outlet branch pipe 521. When part of said filter units 22 are blocked by floc, said bidirectional pump 40 installed on said liquid outlet branch pipe 521 connected to said filter unit 22 introduces water into said filter unit 22 to shake off the floc in said filter unit 22. At the same time, the rest of said filter units 22 are normally filtering, realizing uninterrupted filtering of said filter equipment 20.

[0052] As deformable, a single said bidirectional pump 40 is provided, said bidirectional pump 40 is installed on said liquid outlet main pipe 522. Said valve group 60 further comprises a plurality of liquid outlet control valves 62, each of said liquid outlet branch pipes 521 is respectively installed with a said liquid outlet control valve 62, and water filtered by each of said filter units 22 respectively flows to said aeration tank 30 through a corresponding passage. After all said filter units 22 operate for a predetermined time, said bidirectional pump 40 respectively introduces water into each of said filter units 22 through each of said liquid outlet branch pipes 521 to clean up uniformly.

[0053] It should be understood by those skilled in the art that the embodiments of the present application described above and shown in the drawings are only examples and do not limit the present application. The advantages of the present application have been fully and effectively realized. The function and structural principle of the present application have been demonstrated and explained in the embodiments, and the implementation of the present application can be any modification or change without departing from the principle.

Claims

1. A sewage treatment apparatus characterised in that, The sewage treatment device comprises: an aeration tank; a bidirectional pump; a pipe group, which comprises an inlet pipe group and an outlet pipe group, and the bidirectional pump is installed on the outlet pipe group; a filtering device, which comprises an installation body, at least one filtering mechanism and a locking member, the filtering mechanism comprises a shell and a filtering bag, the shell forms an installation cavity, the filtering bag is detachably installed in the installation cavity, and the filtering bag forms a filtering cavity, the inlet pipe group is connected with the filtering cavity formed by the filtering bag, and sewage mixed with flocculants flows to the filtering cavity through the inlet pipe group, the filtering bag allows water in the filtering cavity to seep out, the installation cavity formed by the shell is connected with the outlet pipe group and the aeration tank, and the bidirectional pump is arranged to be capable of guiding water in the aeration tank to the installation cavity or guiding water in the installation cavity to the aeration tank, the installation body comprises a fixing member and an elastic member, the elastic member is connected with the fixing member, and the shell is swingably connected with the elastic member, the fixing member forms a threaded channel, the locking member is threadedly installed in the threaded channel, and the shell is lockably installed in the locking member in an unlockable manner.

2. The sewage treatment device according to claim 1, wherein The locking member forms a threaded groove, the outer periphery of the shell forms an external thread matched with the threaded groove, the locking member has a preset length, the locking member is kept assembled with the fixing member, and the shell can be screwed out of or into the threaded groove formed by the locking member.

3. The sewage treatment device of claim 2, wherein The sewage treatment device further comprises a pretreatment unit, the pretreatment unit further comprises a suspended substance removal mechanism, the suspended substance removal mechanism further comprises a second mixing member, the second mixing member forms a second mixing cavity, the second mixing cavity formed by the second mixing member is arranged to be capable of being poured with flocculants, and the second mixing cavity formed by the second mixing member and the filtering cavity formed by the filtering bag are connected with the inlet pipe group.

4. The sewage treatment device of claim 3, wherein The suspended substance removal mechanism further comprises a second supply member, the second supply member comprises a storage tank, the storage tank is used for storing flocculants, the storage tank is in communication with the second mixing cavity formed by the second mixing member through a pipeline, and the flocculants stored in the storage tank are injected into the second mixing cavity through the pipeline.

5. The sewage treatment device of claim 4, wherein The pretreatment unit further comprises a phosphorus removal mechanism, the phosphorus removal mechanism comprises a first mixing member, the first mixing member forms a first mixing cavity, the second mixing cavity formed by the second mixing member is in communication with the first mixing cavity formed by the first mixing member through a pipeline, sewage treated by the phosphorus removal mechanism is injected into the second mixing cavity through the pipeline, and the first mixing cavity is arranged to be capable of being poured with a phosphorus removal agent.

6. The sewage treatment device of claim 5, wherein The phosphorus removal mechanism further comprises a first supply member, the first supply member comprises a phosphorus storage tank, the phosphorus storage tank is used for storing a phosphorus removal agent, the phosphorus storage tank is in communication with the first mixing cavity formed by the first mixing member through a pipeline, and the phosphorus removal agent stored in the phosphorus storage tank is injected into the first mixing cavity through the pipeline.

7. The sewage treatment apparatus of claim 6, wherein The pre-treatment unit comprises a foreign matter removing mechanism, which comprises a liquid storage pool and a foreign matter removing member installed in the liquid storage pool and separating the space formed by the liquid storage pool into a sewage chamber and a transition chamber, sewage being introduced into the sewage chamber, the foreign matter removing member forming a plurality of through holes through which the sewage introduced into the sewage chamber flows to the transition chamber, and solid substances mixed in the sewage being intercepted in the sewage chamber, the first mixing member forming the first mixing cavity and the transition chamber being connected by a pipeline, and the sewage after foreign matter removal flowing to the transition chamber being discharged into the first mixing cavity through the pipeline.

8. The sewage treatment device of claim 7, wherein The sewage treatment device further comprises a valve group, the filter mechanism is provided in plurality, the liquid inlet pipe group comprises a plurality of liquid inlet pipes, the second mixing member and each filter bag are communicated with a liquid inlet pipe, each liquid inlet control valve is installed on a liquid inlet pipe, and each liquid inlet control valve controls the opening and closing of each flow path and the flow rate.

9. The sewage treatment device of claim 8, wherein The liquid outlet pipe group comprises a plurality of liquid outlet branch pipes and a liquid outlet main pipe, the housing of each filter mechanism is connected with a liquid outlet branch pipe, the liquid outlet main pipe is connected with the aeration tank, and all the liquid outlet branch pipes are connected with the liquid outlet main pipe.

10. The sewage treatment device of claim 9, wherein The bidirectional pump is provided in single, the bidirectional pump is installed on the liquid outlet main pipe, the valve group further comprises a plurality of liquid outlet control valves, each liquid outlet control valve is installed on each liquid outlet branch pipe, and the water filtered by each filter mechanism flows to the aeration tank through the corresponding passage.

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