CN216737959U - Rural domestic sewage treatment system - Google Patents
Rural domestic sewage treatment system Download PDFInfo
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- CN216737959U CN216737959U CN202122382355.XU CN202122382355U CN216737959U CN 216737959 U CN216737959 U CN 216737959U CN 202122382355 U CN202122382355 U CN 202122382355U CN 216737959 U CN216737959 U CN 216737959U
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- 238000001914 filtration Methods 0.000 claims abstract description 74
- 238000004062 sedimentation Methods 0.000 claims abstract description 61
- 238000005273 aeration Methods 0.000 claims abstract description 53
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Abstract
The utility model discloses a rural domestic sewage treatment system, which comprises a grating tank, a primary sedimentation tank, an anaerobic tank, an anoxic tank, an aeration tank, a secondary sedimentation tank, a primary plant filtering tank and a secondary plant filtering tank which are connected in sequence; wherein, one end of the grating tank is provided with a valve for receiving rural domestic sewage, and the other end of the grating tank is connected with the primary sedimentation tank through a pipeline; the primary sedimentation tank is arranged right above the anaerobic tank and is connected with the anaerobic tank through a filterability valve; the anaerobic pool is also connected with a first gas collecting device for collecting gas; the aeration tank is arranged right above the anoxic tank and is connected with the anoxic tank through a water pump, and the anoxic tank is also connected with a second gas collecting device for collecting gas; the aeration tank, the secondary sedimentation tank, the primary plant filtering tank and the secondary plant filtering tank are sequentially connected through pipelines, and the secondary plant filtering tank is also provided with a pipeline connected with river water; the lifting partition plate is also arranged, so that the primary sedimentation tank is conveniently communicated with the anaerobic tank, and the maintenance is convenient; and the floor space is reduced by adopting the layout of a partial vertical structure.
Description
Technical Field
The utility model relates to a rural domestic sewage treatment system, and belongs to the field of sewage treatment.
Background
At present, rural economy develops rapidly, the living standard of farmers is greatly improved, but rural environment construction and economic development are asynchronous, and the problem of water environment pollution is particularly serious; the existing rural domestic sewage purification system has the problems of high cost, inconvenient maintenance, more occupied land and the like, so that untreated domestic sewage is randomly discharged, the water quality of ditches and ponds is blackened and becomes odorous, mosquitoes are bred, the rural living environment is affected, the physical health of residents is threatened, and meanwhile, the pollution of drinking water sources and the eutrophication of lakes and reservoirs can be caused; in the current rural environmental problems, the river pollution is particularly serious, and the main reason is that rural domestic sewage is directly discharged into the river without being treated, so that rural rivers become dirty, black and smelly; therefore, a purification system with high purification, low cost, small occupied area and easy maintenance is urgently needed for rural domestic sewage.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a rural domestic sewage treatment system, which solves the problem that rural domestic sewage is directly discharged without being treated and has small floor area.
In order to realize the purpose, the utility model is realized by adopting the following technical scheme:
the utility model provides a rural domestic sewage treatment system, which comprises a grating tank, a primary sedimentation tank, an anaerobic tank, an anoxic tank, an aeration tank, a secondary sedimentation tank, a primary plant filtering tank and a secondary plant filtering tank which are connected in sequence; wherein, one end of the grid pool is provided with a valve for receiving domestic sewage, and the other end of the grid pool is connected with the primary sedimentation pool through a pipeline; the primary sedimentation tank is arranged right above the anaerobic tank and is connected with the anaerobic tank through a filterability valve; the anaerobic tank is connected with the anoxic tank through a pipeline, and is also connected with a first gas collecting device for collecting gas generated in the treatment process; the aeration tank is arranged right above the anoxic tank and is connected with the anoxic tank through a water pump, and the anoxic tank is also connected with a second gas collecting device for collecting gas generated in the treatment process; the aeration tank, the secondary sedimentation tank, the primary plant filtering tank and the secondary plant filtering tank are sequentially connected through pipelines, and the secondary plant filtering tank is also provided with a pipeline connected with river water.
Furthermore, a grating for filtering the garbage and a first sewage suction pump for sucking away the garbage are arranged in the grating pool; the grid shields the pipeline connected with the primary sedimentation tank, but does not shield the first sewage suction pump, and the first sewage suction pump is arranged at the bottom of the grid tank.
Furthermore, a hair absorber for absorbing hair and a first solar energy supply plate which is connected with the hair absorber and supplies power to the hair absorber are arranged in the primary sedimentation tank.
Further, be equipped with in the aeration tank and carry out the aeration stick that aerates, carry out the rotatory agitator that stirs to domestic sewage and link to each other and for its second solar energy supply board of power supply with the aeration stick to domestic sewage, rotatory agitator is located around the aeration stick.
Further, be equipped with the lift baffle between elementary sedimentation tank and the anaerobism pond, when the anaerobism pond broke down, the lift baffle can rise to elementary sedimentation tank top, and elementary sedimentation tank and anaerobism pond are in the intercommunication state this moment.
Furthermore, a second sewage suction pump for sucking away sediments is arranged at the bottom of the secondary sedimentation tank.
Furthermore, a wetland plant filtering layer, a first shale ceramsite filtering layer, a first fine gravel filtering layer and a first quartz sand filtering layer are arranged in the primary plant filtering tank from top to bottom.
Furthermore, an economic plant filtering layer, a second shale ceramsite filtering layer, a second fine gravel filtering layer and a second quartz sand filtering layer are arranged in the secondary plant filtering tank from top to bottom.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model provides a rural domestic sewage treatment system which comprises a grating tank, a primary sedimentation tank, an anaerobic tank, an anoxic tank, an aeration tank, a secondary sedimentation tank, a primary plant filtering tank and a secondary plant filtering tank which are connected in sequence; wherein, one end of the grid pool is provided with a valve for receiving domestic sewage, the grid pool carries out the first-step filtration on the domestic sewage, and the other end of the grid pool is connected with the primary sedimentation tank through a pipeline; the primary sedimentation tank is arranged right above the anaerobic tank and connected through a filterability valve, the aeration tank is arranged right above the anoxic tank and connected through a water pump, and the vertical structure can reduce the floor area of the whole system; the aeration tank, the secondary sedimentation tank, the primary plant filtering tank and the secondary plant filtering tank are sequentially connected through pipelines, the secondary plant filtering tank is also provided with a pipeline connected with river water, and domestic sewage is treated heavily and then discharged into a river, so that the environmental pollution can be effectively improved;
according to the rural domestic sewage treatment system provided by the utility model, the lifting partition plate is arranged between the primary sedimentation tank and the anaerobic tank, when the anaerobic tank breaks down, the lifting partition plate can rise above the primary sedimentation tank, and the primary sedimentation tank and the anaerobic tank are in a communicated state, so that the rural domestic sewage treatment system is convenient to maintain.
Drawings
FIG. 1 is a block diagram of a domestic sewage treatment system according to an embodiment of the present invention.
In the figure: 1. a valve; 2-1, a first sewage suction pump; 2-2, a second sewage suction pump; 2-3, a third sewage suction pump; 3-1, a first gas collection device; 3-2, a second gas collecting device; 4. an anaerobic tank; 5. a filterability valve; 6. a hair absorber; 7. a first solar energy supply panel; 8. an aeration rod; 9. rotating the stirrer; 10. an anoxic tank; 11. a water pump; 12. a secondary sedimentation tank; 13. a grid tank; 14. a second solar energy supply panel; 15. a wetland plant filter layer; 16. an economic plant filtration layer; 17-1, a first shale ceramsite filter layer; 17-2, a second shale ceramsite filtering layer; 18-1, a first fine gravel filter layer; 18-2, a second fine gravel filter layer; 19-1, a first quartz sand filter layer; 19-2, a second quartz sand filter layer; 20. a primary sedimentation tank; 21. an aeration tank; 23. and lifting the partition plate.
Detailed Description
The utility model is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Example one
As shown in figure 1, the utility model provides a rural domestic sewage treatment system, which comprises a grid tank 13, a primary sedimentation tank 20, an anaerobic tank 4, an anoxic tank 10, an aeration tank 21, a secondary sedimentation tank 12, a primary plant filtering tank and a secondary plant filtering tank which are connected in sequence.
A valve 1 is arranged at one end of the grating tank 13, the valve 1 can receive the transported domestic sewage after being opened, a pipeline is arranged at the other end of the grating tank 13 and is connected with the primary sedimentation tank 20, a grating is arranged in the grating tank 13 and is connected with the side wall and the bottom of the grating tank 13, and the grating is blocked in front of the pipeline and is used for filtering large-volume garbage; the bottom of the grating pool 13 is also provided with a first sewage suction pump 2-1 which is arranged in the bottom area which is not blocked by the grating and is used for sucking away the garbage filtered by the grating.
Be equipped with two hair adsorbers 6 in the preliminary sedimentation tank 20 for adsorb the hair in the domestic sewage, two first solar energy supply boards 7 are connected to two hair adsorbers 6 top electricity respectively, two first solar energy supply boards 7 all adopt the lotus leaf shape and build more than ground, the lotus leaf shape can the at utmost absorb solar energy, be used for solar energy power generation, the electric energy passes through the circuit and transmits hair adsorber 6, two first solar energy supply boards 7 provide the energy for the operation of above-mentioned two hair adsorbers 6.
The anaerobic tank 4 is arranged right below the primary sedimentation tank 20, the anaerobic tank 4 and the primary sedimentation tank 20 are separated by a lifting partition plate 23, and the lifting partition plate 23 is also provided with a filtering valve 5 for connecting the primary sedimentation tank 20 and the anaerobic tank 4; the anaerobic tank 4 is used for hydrolyzing high molecular organic matters in the domestic sewage and then carrying out acidification reaction to generate methane, and the anaerobic tank 4 is connected with a first gas collecting device 3-1 for collecting methane gas generated in the anaerobic tank 4.
The anoxic tank 10 is connected with the anaerobic tank 4 through a pipeline, the anoxic tank 10 is used for removing nitrate nitrogen in domestic sewage, and the anoxic tank 10 is connected with a second gas collecting device 3-2 for collecting nitrogen gas generated in the anoxic tank 10.
The aeration tank 21 is arranged right above the anoxic tank 10 and is connected with the anoxic tank 10 through a water pump 11, and the water pump 11 pumps the domestic sewage treated by the anoxic tank 10 into the aeration tank 21 for aeration; the aeration tank 21 is internally provided with an aeration rod 8, a rotary stirrer 9 and a second solar energy supply plate 14, the second solar energy supply plate 14 is respectively and electrically connected with the aeration rod 8 and the rotary stirrer 9, the second solar energy supply plate 14 also adopts a lotus leaf shape and is built above the ground, the lotus leaf shape can absorb solar energy to the maximum extent and is used for solar power generation, and electric energy is transmitted to the aeration rod 8 and the rotary stirrer 9 through a circuit to support the operation of the aeration rod 8 and the rotary stirrer 9; aeration tank 21 adopts the mode that aeration stick 8 and rotary agitator 9 combined together to carry out solar energy aeration to domestic sewage, and rotary agitator 9 can make the domestic sewage in aeration tank 21 fully contact through the stirring to this improves dissolved oxygen content, makes the aeration more even, abundant, provides good operating condition for good oxygen bacterium, and purification efficiency improves greatly.
The secondary sedimentation tank 12 is connected with the aeration tank 21 through a pipeline, the secondary sedimentation tank 12 is used for further sedimentation of the domestic sewage treated by the aeration tank 21, the bottom of the secondary sedimentation tank 12 is provided with a second sewage suction pump 2-2, and the second sewage suction pump 2-2 is used for sucking away the sediment in the secondary sedimentation tank 12.
The rural domestic sewage treatment system provided by the embodiment of the utility model comprises two vertically-structured structures, the floor area is greatly reduced, and a green land and a landscape planning can be built on the ground.
The primary plant filtering tank is connected with the secondary sedimentation tank 12 through a pipeline, the primary plant filtering tank is provided with a wetland plant filtering layer 15, a first shale ceramsite filtering layer 17-1, a first fine gravel filtering layer 18-1 and a first quartz sand filtering layer 19-1 from top to bottom, domestic sewage is filtered layer by layer, and the bottom of the primary plant filtering tank is provided with a pipeline connected with the secondary plant filtering tank.
The secondary plant filtering tank is provided with an economic plant filtering layer 16, a second shale ceramsite filtering layer 17-2, a second fine gravel filtering layer 18-2 and a second quartz sand filtering layer 19-2 from top to bottom, and domestic sewage is sequentially filtered.
Finally, in order to eliminate germs, disinfection treatment is carried out before discharge, so that the water after the disinfection treatment at least reaches the first-class B standard, and is discharged into GB3838 surface water III functional water areas, referring to GB 8978-1996; the standard values are as follows: the pH value measured by glass electrode method is 6-9mg/L, the dissolved oxygen measured by iodometry or telephone line talking head method is not less than 5mg/L, the potassium permanganate index is not more than 6mg/L, the Chemical Oxygen Demand (COD) measured by dichromate method is not more than 20mg/L, and the Biochemical Oxygen Demand (BOD) measured by dilution and inoculation method for five days5) Not more than 4mg/L, and ammonia nitrogen not more than 1mg/L tested by adopting a Nashin reagent colorimetric method or a salicylic acid spectrophotometry.
When the rural domestic sewage treatment system provided by the embodiment of the utility model has a fault, the valve 1 is firstly closed, the receiving of the domestic sewage is stopped, the fault component is checked, and if the fault component is the anaerobic tank 4 or the anoxic tank 10, the lifting partition plate 23 is opened for checking and maintenance.
Example two
As shown in figure 1, the utility model provides a rural domestic sewage treatment system, which comprises a grid tank 13, a primary sedimentation tank 20, an anaerobic tank 4, an anoxic tank 10, an aeration tank 21, a secondary sedimentation tank 12, a primary plant filtering tank and a secondary plant filtering tank which are connected in sequence.
Firstly, domestic sewage reaches a valve 1 through a sewage pipeline, the valve 1 is opened, the domestic sewage enters a grid pool 13, a grid is arranged in the grid pool 13 and is connected with the side wall and the bottom of the grid pool 13, and the grid is blocked in front of the pipeline and is used for filtering large-volume garbage; the bottom of the grating pool 13 is also provided with a first sewage suction pump 2-1 which is arranged in the bottom area which is not blocked by the grating and is used for sucking away the garbage filtered by the grating; the larger volume of waste is retained by the action of the grid tank 13.
The domestic sewage after primary filtration reaches the primary sedimentation tank 20 of the next device through a pipeline, the hair absorber 6 and the first solar energy supply plate 7 connected with the hair absorber 6 are arranged in the primary sedimentation tank 20, the first solar energy supply plate 7 is in a lotus leaf shape and is arranged on the ground, solar energy is absorbed to the maximum extent, the solar energy is converted into electric energy to be transmitted to the hair absorber 6, the hair absorber 6 is enabled to operate, and hairs in the domestic sewage are absorbed and collected.
The domestic sewage treated by the primary sedimentation tank 20 is led into an anaerobic tank 4 through a filterability valve 5, the anaerobic tank 4 is arranged right below the primary sedimentation tank 20, and the two are separated by a lifting clapboard 23; the domestic sewage is subjected to hydrolysis reaction in the anaerobic tank 4, macromolecular organic matters in the domestic sewage are hydrolyzed, then an acidification stage is carried out, and finally substances such as acetic acid, carbonic acid, hydrogen and the like are mainly generated, wherein the main reaction process is as follows:
finally, methane is generated, and the main process is as follows:
the anaerobic tank 4 is connected with a first gas collecting device 3-1, generated gas is collected by the first gas collecting device 3-1, and then sewage flows into the anoxic tank 10.
The anoxic condition is kept in the anoxic tank 10, denitrification is carried out under the condition to remove nitrate nitrogen, and the total denitrification process is as follows:
the anoxic tank 10 is connected with a second gas collecting device 3-2, the generated gas is collected by the second gas collecting device 3-2, and the treated domestic sewage is pumped to the aeration tank 21 through the water pump 11.
The aeration tank 21 is arranged right above the anoxic tank 10 and is connected with the anoxic tank 10 through a water pump 11, and the water pump 11 pumps the domestic sewage treated by the anoxic tank 10 into the aeration tank 21 for aeration; the aeration tank 21 is internally provided with an aeration rod 8, a rotary stirrer 9 and a second solar energy supply plate 14, the second solar energy supply plate 14 is respectively and electrically connected with the aeration rod 8 and the rotary stirrer 9, the second solar energy supply plate 14 also adopts a lotus leaf shape and is built above the ground, the lotus leaf shape can absorb solar energy to the maximum extent and is used for solar power generation, and electric energy is transmitted to the aeration rod 8 and the rotary stirrer 9 through a circuit to support the operation of the aeration rod 8 and the rotary stirrer 9; aeration tank 21 adopts the mode that aeration stick 8 and rotary agitator 9 combined together to carry out solar energy aeration to domestic sewage, and rotary agitator 9 can make the domestic sewage in aeration tank 21 fully contact through the stirring to this improves dissolved oxygen content, makes the aeration more even, abundant, provides good operating condition for good oxygen bacterium, and purification efficiency improves greatly.
The aerated domestic sewage flows into a secondary sedimentation tank 12 through a pipeline for further solid-liquid separation, a second sewage suction pump 2-2 is arranged at the bottom of the secondary sedimentation tank 12, and the second sewage suction pump 2-2 is used for sucking away sediments in the secondary sedimentation tank 12.
The domestic sewage treated by the secondary sedimentation tank 12 flows into the primary plant filtering tank, the primary plant filtering tank is provided with a wetland plant filtering layer 15, a first paper rock ceramsite filtering layer 17-1, a first fine gravel filtering layer 18-1 and a first quartz sand filtering layer 19-1 from top to bottom, the wetland plant filtering layer 15 is used for absorbing partial impurities and trace elements, and the domestic sewage flows into the secondary plant filtering tank through a pipeline at the bottom of the primary plant filtering tank after being filtered layer by layer.
The secondary plant filtering tank is provided with an economic plant filtering layer 16, a second shale ceramsite filtering layer 17-2, a second fine gravel filtering layer 18-2 and a second quartz sand filtering layer 19-2 from top to bottom, domestic sewage is sequentially filtered, and finally the domestic sewage is discharged into a river from a pipeline at the bottom of the secondary plant filtering tank to finish the treatment of the domestic sewage, and the economic plant filtering layer 16 can also increase economic benefits for people.
In order to make sewage flow automatically through gravity, the primary plant filtering tank and the secondary plant filtering tank adopt grading to reduce the terrain stage by stage, so that the effect of stable and stable purification of water flow is achieved.
Finally, in order to eliminate germs, disinfection treatment is carried out before discharge, so that the water after the disinfection treatment at least reaches the first-class B standard, and is discharged into GB3838 surface water III functional water areas, refer to GB 8978-1996; the standard values are as follows: the pH value measured by glass electrode method is 6-9mg/L, the dissolved oxygen measured by iodometry or telephone line talking head method is not less than 5mg/L, the potassium permanganate index is not more than 6mg/L, the Chemical Oxygen Demand (COD) measured by dichromate method is not more than 20mg/L, and the Biochemical Oxygen Demand (BOD) measured by dilution and inoculation method for five days5) Not more than 4mg/L, and ammonia nitrogen not more than 1mg/L tested by adopting a Nashin reagent colorimetric method or a salicylic acid spectrophotometry.
When the rural domestic sewage treatment system provided by the embodiment of the utility model has a fault, the valve 1 is firstly closed, the receiving of the domestic sewage is stopped, the fault component is checked, and if the fault component is the anaerobic tank 4 or the anoxic tank 10, the lifting partition plate 23 is opened for checking and maintenance.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A rural domestic sewage treatment system is characterized by comprising a grating tank, a primary sedimentation tank, an anaerobic tank, an anoxic tank, an aeration tank, a secondary sedimentation tank, a primary plant filtering tank and a secondary plant filtering tank which are connected in sequence; wherein, one end of the grid pool is provided with a valve for receiving domestic sewage, and the other end of the grid pool is connected with the primary sedimentation pool through a pipeline; the primary sedimentation tank is arranged right above the anaerobic tank and is connected with the anaerobic tank through a filterability valve; the anaerobic tank is connected with the anoxic tank through a pipeline, and is also connected with a first gas collecting device for collecting gas generated in the treatment process; the aeration tank is arranged right above the anoxic tank and is connected with the anoxic tank through a water pump, and the anoxic tank is also connected with a second gas collecting device for collecting gas generated in the treatment process; the aeration tank, the secondary sedimentation tank, the primary plant filtering tank and the secondary plant filtering tank are sequentially connected through pipelines, and the secondary plant filtering tank is also provided with a pipeline connected with river water.
2. The rural domestic sewage treatment system of claim 1, wherein a grid for filtering garbage and a first sewage suction pump for sucking away the garbage are arranged in the grid tank; the grid shields the pipeline connected with the primary sedimentation tank, but does not shield the first sewage suction pump, and the first sewage suction pump is arranged at the bottom of the grid tank.
3. The rural domestic sewage treatment system of claim 1, wherein the primary sedimentation tank is provided with a hair absorber for absorbing hair, and a first solar energy supply plate connected with the hair absorber and supplying power to the hair absorber.
4. The rural domestic sewage treatment system of claim 1, wherein the aeration tank is provided with an aeration rod for aerating the domestic sewage, a rotary stirrer for stirring the domestic sewage, and a second solar energy supply plate connected with and supplying power to the aeration rod, and the rotary stirrer is arranged around the aeration rod.
5. The rural domestic sewage treatment system of claim 1, wherein a lifting partition is arranged between the primary sedimentation tank and the anaerobic tank, and when the anaerobic tank fails, the lifting partition can rise above the primary sedimentation tank, and the primary sedimentation tank and the anaerobic tank are in a communication state.
6. The rural domestic sewage treatment system of claim 1, wherein the bottom of the secondary sedimentation tank is provided with a second sewage suction pump for sucking away sediments.
7. The rural domestic sewage treatment system of claim 1, wherein the primary plant filter tank is provided with a wetland plant filter layer, a first shale ceramsite filter layer, a first fine gravel filter layer and a first quartz sand filter layer from top to bottom.
8. The rural domestic sewage treatment system of claim 1, wherein the secondary plant filter tank is provided with an economic plant filter layer, a second shale ceramsite filter layer, a second fine gravel filter layer and a second quartz sand filter layer from top to bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122382355.XU CN216737959U (en) | 2021-09-29 | 2021-09-29 | Rural domestic sewage treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122382355.XU CN216737959U (en) | 2021-09-29 | 2021-09-29 | Rural domestic sewage treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216737959U true CN216737959U (en) | 2022-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122382355.XU Active CN216737959U (en) | 2021-09-29 | 2021-09-29 | Rural domestic sewage treatment system |
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| CN (1) | CN216737959U (en) |
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2021
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