Constructed wetland bottom layer drainage system capable of controlling permeation adjustment

Abstract

The utility model discloses a controllable permeation regulation constructed wetland bottom layer drainage system, which comprises a water filtering layer arranged in a wetland pond and sequentially comprises a river sand filling layer, a quartz sand filling layer, a gravel filling layer and a high-strength permeable grating layer. A drainage connector is connected to the side wall of the bottom of the wetland pond, and a drainage caisson connected with the drainage connector is buried in a soil layer on the outer side of the wetland. The sandy soil backfilling assembly and the drainage assembly are installed on the drainage caisson. The sandy soil backfilling assembly comprises an outer sleeve, a desilting barrel, an inner sleeve, a spiral conveying blade and a backfilling pipe. According to the system, long-term stable operation of the wetland is ensured, the water quality purification efficiency is improved, the landscape effect and the ecological function of the wetland are enhanced, and an advanced and practical solution is provided for urban and rural sewage treatment and river and lake restoration.

Description

Technical Field

[0001] The utility model relates to the technical field of artificial wetlands, in particular to an artificial wetland bottom drainage system with controllable osmotic regulation. Background Art

[0002] As an eco-friendly sewage treatment technology, artificial wetlands are increasingly widely used in urban and rural sewage treatment, river and lake water restoration, rural domestic sewage treatment and other fields. Artificial wetlands simulate the ecological functions of natural wetlands and use natural ecological processes such as aquatic plants, soil, and microorganisms to effectively biodegrade and adsorb sewage entering the wetlands. During its operation, it does not require complex mechanical equipment, can effectively reduce energy consumption and operating costs, and embodies the characteristics of environmental friendliness and economic feasibility.

[0003] However, in practical applications, traditional artificial wetlands still have some problems that need further improvement. First, the water flow distribution and residence time inside artificial wetlands are difficult to control, and the phenomenon of "short-circuit flow" is prone to occur, thus affecting the overall treatment efficiency. Secondly, the filter material filled in artificial wetlands is prone to reduce permeability due to silt blockage during long-term operation, causing the water level in the wetland to rise and affect the growth of vegetation. Furthermore, the structure of the artificial wetland drainage system is often relatively simple, making it difficult to effectively regulate the infiltration volume of the water body inside the wetland, which is not conducive to the replacement and maintenance of the water body. In addition, the coordination between artificial wetlands and the surrounding natural environment also needs to be further improved to enhance their landscape and ecological functions. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a controllable infiltration-regulated artificial wetland bottom drainage system, which not only ensures the long-term stable operation of the wetland and improves the water purification efficiency, but also enhances the landscape effect and ecological function of the wetland, providing an advanced and practical solution for urban and rural sewage treatment and river and lake restoration.

[0005] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: a controllable osmotic adjustment artificial wetland bottom drainage system, including a water filtration layer arranged in a wetland pond, the water filtration layer including a river sand filling layer, a quartz sand filling layer, a gravel filling layer, and a high-strength permeable grid layer arranged in sequence from top to bottom, the bottom side wall of the wetland pond is fixedly connected to a drainage interface that is horizontally opposite to the high-strength permeable grid layer, and the drainage interface is connected to a drainage caisson buried in the soil layer outside the wetland pond.

[0006] It also includes a sand backfill component and a drainage component which are mounted on the drainage caisson, and the drainage component is mounted on the downstream side of the drainage caisson.

[0007] The sand backfill assembly includes an outer sleeve, a sand settling bucket, an inner sleeve, a spiral conveying blade, and a backfill pipe. The outer sleeve and the sand settling bucket are respectively fixed to the upper and lower sides of the drainage caisson and remain vertically opposite to each other. The inner sleeve is arranged on the inner side of the outer sleeve and the sand settling bucket, and water filter holes are evenly opened on the inner sleeve. The spiral conveying blade is fixed to the installation shaft, and the installation shaft is rotatably installed at the axis center of the inner sleeve. The two ends of the backfill pipe are respectively connected to the wetland pond and the top of the inner sleeve.

[0008] In some of the implementations, in order to further improve the aesthetics of the wetland pond and enhance the fixing effect of the river sand filling layer and the quartz sand filling layer, the following technical solutions are provided.

[0009] Aquatic plants are also planted in the wetland pond, and the roots of the aquatic plants grow in the river sand filling layer and the quartz sand filling layer.

[0010] In some of the implementations, in order to facilitate the stable installation of the outer sleeve and the sand settling bucket on the drainage caisson, ensure that the spiral conveying blade can be stably installed in the inner sleeve, and facilitate the disassembly and maintenance of the inner sleeve in the outer sleeve and the sand settling bucket, the following technical solutions are provided.

[0011] An upper interface and a lower interface are respectively provided on the top wall and the bottom wall of the drainage caisson. A connecting cover arranged vertically opposite to the upper interface is fixedly connected to the bottom of the outer sleeve. The drainage caisson is fixedly connected to the connecting cover by a bolt assembly. The top outer edge of the sand settling bucket is fixedly connected to the bottom wall of the drainage caisson by a bolt assembly, and the sand settling bucket and the lower interface remain vertically opposite to each other.

[0012] The inner sleeve includes an upper sleeve, a middle sleeve, and a lower sleeve which are spliced ​​and assembled in sequence from top to bottom. A positioning ring is provided at the bottom of the sand settling barrel to maintain nesting and matching with the lower sleeve. Sand and soil passages are evenly provided on the side walls of the lower sleeve. An assembly groove is provided at the bottom of the lower sleeve to maintain rotational connection with the installation shaft. The middle sleeve is nested and connected with the outer sleeve, and the middle sleeve is fixedly connected to the top of the outer sleeve by a bolt assembly. The backfill pipe is connected to the upper sleeve, and the top of the upper sleeve is rotationally connected to the installation shaft.

[0013] In some of the implementations, in order to ensure that the spiral conveying blades can operate stably to drive the sediment in the inner sleeve to be stably lifted, the following technical solutions are provided.

[0014] An assembly seat is fixedly connected to the top of the upper sleeve, and the sand backfill assembly also includes a driving motor fixedly installed on the assembly seat. A driving bevel gear is fixedly connected to the output shaft of the driving motor, and a transmission bevel gear arranged on the outside of the inner sleeve is fixedly connected to the top of the mounting shaft, and the transmission bevel gear is meshed with the driving bevel gear.

[0015] In some of the implementations, in order to ensure that the drainage assembly can effectively discharge the water in the drainage caisson and conveniently control the infiltration volume of the water body in the wetland pond, the following technical solutions are provided.

[0016] The drainage assembly includes a water storage bucket, a drainage pipe, a water pump, and a switch valve. A connecting port is opened at the downstream end of the drainage caisson. The water storage bucket is fixedly connected to the connecting port and maintained in communication with the drainage caisson. The water pump is fixedly installed on the soil layer. The two ends of the drainage pipe are respectively connected to the upper water inlet of the water pump and the bottom wall of the water storage bucket. The switch valve is assembled on the drainage pipe and arranged on the soil layer.

[0017] Beneficial effects of the utility model:

[0018] 1. Improve the flowability and controllability of wetland water. The wetland pond adopts a layered filter structure, which can effectively intercept suspended matter and impurities in the water and avoid rapid clogging of the filter. At the same time, through the design of drainage interface and drainage caisson, the infiltration volume of wetland water can be finely adjusted, avoiding the "short circuit" problem of water flow and improving the overall treatment efficiency.

[0019] 2. The circulation, replacement and maintenance of wetland water bodies are realized. The sand backfill components set in the drainage caisson can regularly lift the sediment deposited in the filter layer and backfill it into the wetland pond, effectively avoiding the clogging problem of the filter layer and ensuring the long-term stable operation of the wetland. At the same time, through the design of the drainage components, the wetland water can also be effectively discharged and replaced to ensure the water quality.

[0020] 3. Enhance the landscape effect and ecological function of the wetland. Planting aquatic plants in the wetland pond not only beautifies the landscape, but its roots can also fix the sand and gravel in the filter layer, enhancing the overall stability. At the same time, the absorption effect of the plant roots also helps to further improve the water purification effect of the wetland.

[0021] 4. Improved maintainability of the system. An interface is provided on the top of the drainage caisson to facilitate disassembly and maintenance of the internal sand backfill components; the three-section structural design of the inner sleeve can also be easily maintained and replaced. The overall structure of the system is more user-friendly, which greatly improves the convenience in practical applications.

[0022] In summary, this artificial wetland bottom drainage system with controllable infiltration regulation not only ensures the long-term stable operation of the wetland and improves the water purification efficiency, but also enhances the landscape effect and ecological function of the wetland, providing advanced and practical solutions for urban and rural sewage treatment, river and lake restoration and other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the on-site implementation of the utility model;

[0024] Figure 2 It is a schematic diagram of the model structure of the utility model;

[0025] Figure 3 It is a schematic diagram of the structure of the drainage caisson, sand backfill assembly, and drainage assembly after sectioning;

[0026] Figure 4 For Figure 3 Detailed schematic diagram of the matching combination of drainage caisson and sand backfill components on the foundation.

[0027] In the figure: 1 wetland pond, 11 drainage interface, 12 support seat, 21 river sand filling layer, 22 quartz sand filling layer, 23 gravel filling layer, 24 high-strength permeable grid layer, 3 soil layer, 4 drainage caisson, 41 upper interface, 42 lower interface, 43 connecting port, 44 slope section, 51 outer sleeve, 511 connecting cover, 52 sedimentation bucket, 521 positioning ring, 531 upper sleeve, 5311 assembly seat, 532 middle sleeve, 533 lower sleeve, 5331 sand port, 54 spiral conveying blade, 541 installation shaft, 542 transmission bevel gear, 55 backfill pipe, 56 drive motor, 561 drive bevel gear, 61 water accumulation bucket, 62 drainage pipe, 63 water pump, 64 switch valve, 7 water body, 8 aquatic plants. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] See also Figure 1-4 A controllable infiltration-regulated artificial wetland bottom drainage system comprises a water filter layer arranged in a wetland pond 1, wherein the water filter layer comprises a river sand filling layer 21, a quartz sand filling layer 22, a gravel filling layer 23, and a high-strength permeable grid layer 24 arranged in sequence from top to bottom, and a drainage interface 11 which is fixedly connected to the bottom side wall of the wetland pond 1 and is horizontally opposite to the high-strength permeable grid layer 24, and a drainage caisson 4 which is buried in a soil layer 3 outside the wetland pond 1 is connected to the drainage interface 11.

[0030] It also includes a sand backfill component and a drainage component which are mounted on the drainage caisson 4 , and the drainage component is mounted on the downstream side of the drainage caisson 4 .

[0031] The sand backfill assembly includes an outer sleeve 51, a sand settling bucket 52, an inner sleeve, a spiral conveying blade 54, and a backfill pipe 55. The outer sleeve 51 and the sand settling bucket 52 are respectively fixed to the upper and lower sides of the drainage caisson 4 and remain vertically opposite to each other. The inner sleeve is arranged on the inner side of the outer sleeve 51 and the sand settling bucket 52, and water filtering holes are evenly opened on the inner sleeve. The spiral conveying blade 54 is fixed to the installation shaft 541, and the installation shaft 541 is rotatably installed at the axis center of the inner sleeve. The two ends of the backfill pipe 55 are respectively connected to the wetland pond 1 and the top of the inner sleeve.

[0032] The wetland pond 1 is formed by integrally pouring reinforced concrete and is placed in the soil layer 3. It can also be connected to the river channel on its outside, and a cofferdam or a retaining dam is installed between the river channel and the wetland pond 1 to separate the two. People can walk on the cofferdam or the retaining dam, and ornamental plants can be planted on both sides of the cofferdam and the retaining dam to increase the integration of the wetland pond 1 and the river channel, increase the beauty, and present it as a river channel landscape.

[0033] The drainage interface 11 connected to the wetland pond 1 is also formed by integrally pouring reinforced concrete.

[0034] The wetland pond 1 is added with a water body 7 for maintaining a specific water level, and the river sand filling layer 21, the quartz sand filling layer 22, and the gravel filling layer 23 arranged from top to bottom can effectively intercept plankton and other impurities, and the high-strength permeable grid adopts HDPE (high-density polyethylene) grid or PVC (polyvinyl chloride) grid, which is provided with small holes. While ensuring effective support for the upper river sand filling layer 21, quartz sand filling layer 22, and gravel filling layer 23, it can ensure the normal passage of the water body 7, and the water body 7 can flow into the drainage caisson 4 through the drainage interface 11.

[0035] The water body 7 in the drainage caisson 4 first passes through the sand backfill component, and the river sand and quartz sand particles carried in the water body 7 are deposited in the sand settling bucket 52 to achieve separation of the sand and the water body 7. The separated water body 7 is discharged by the drainage component. The drainage component can effectively adjust the infiltration volume of the water body 7 in the wetland pond 1 to facilitate the replacement of the water body 7 therein and ensure that the entity is always maintained near the set water level line. After the wetland pond 1 has been running for a period of time, the drive installation shaft 541 and the spiral conveying blade 54 are driven to operate, and the sand and soil deposited in the sand settling bucket 52 are lifted in the inner sleeve under the action of the spiral conveying blade 54. The mixed water can leak into the outer sleeve 51 through the water filter holes on the side wall of the inner sleeve. The outer sleeve 51 is connected with the drainage caisson 4 and flows back to the drainage caisson 4 for external discharge. The lifted sand and soil finally flows back to the wetland pond 1 through the backfill pipe 55 to supplement the river sand filling layer 21 and the quartz sand filling layer 22.

[0036] After the artificial wetland bottom drainage system provided in the present application has been running for a long time, the river sand filling layer 21 and the quartz sand filling layer 22 are in a circulating state, which will eventually lead to the river sand and quartz sand being fully mixed, but will not affect the filtering effect of the water body 7.

[0037] In order to further improve the aesthetics of the wetland pond 1 and enhance the fixing effect of the river sand filling layer 21 and the quartz sand filling layer 22, the following technical solutions are provided.

[0038] Aquatic plants 8 are also planted in the wetland pond 1 , and the roots of the aquatic plants 8 grow in the river sand filling layer 21 and the quartz sand filling layer 22 .

[0039] The aquatic plants 8 can enhance the aesthetics and ornamental value of the wetland pond 1. The root system of the aquatic plants 8 is located in the river sand fill layer 21 and the quartz sand fill layer 22, and can effectively absorb the nutrients contained therein, and achieve the sand fixation effect on the river sand fill layer 21 and the quartz sand fill layer 22, reduce the penetration of river sand and quartz sand through the gravel fill layer 23 and the high-strength permeable grid layer 24, and reduce the workload of the drainage caisson 4 and the sand backfill component.

[0040] In order to facilitate the stable installation of the outer sleeve 51 and the sand bucket 52 on the drainage caisson 4, ensure that the spiral conveying blade 54 can be stably installed in the inner sleeve, and facilitate the disassembly and maintenance of the inner sleeve in the outer sleeve 51 and the sand bucket 52, the following technical solution is provided.

[0041] An upper interface 41 and a lower interface 42 are respectively provided on the top wall and the bottom wall of the drainage caisson 4. A connecting cover 511 arranged vertically opposite to the upper interface 41 is fixedly connected to the bottom of the outer sleeve 51. The drainage caisson 4 is fixedly connected to the connecting cover 511 by a bolt assembly. The top outer edge of the sand settling bucket 52 is fixedly connected to the bottom wall of the drainage caisson 4 by a bolt assembly, and the sand settling bucket 52 remains vertically opposite to the lower interface 42.

[0042] The inner sleeve includes an upper sleeve 531, a middle sleeve 532, and a lower sleeve 533 which are assembled in sequence from top to bottom. A positioning ring 521 is provided at the bottom of the sand settling barrel 52 to maintain nesting and matching with the lower sleeve 533. Sand and soil passages 5331 are evenly provided on the side wall of the lower sleeve 533. An assembly groove which is rotatably connected with the installation shaft 541 is provided at the bottom of the lower sleeve 533. The middle sleeve 532 is nested and connected with the outer sleeve 51, and the middle sleeve 532 is fixedly connected to the top of the outer sleeve 51 by a bolt assembly. The backfill pipe 55 is connected to the upper sleeve 531, and the top of the upper sleeve 531 is rotatably connected with the installation shaft 541.

[0043] The design of the upper interface 41 and the lower interface 42 on the drainage caisson 4 can ensure that the sand settling bucket 52 and the outer sleeve 51 are stably installed on the drainage caisson 4 and achieve the communication effect with the drainage caisson 4.

[0044] The upper sleeve 531, the middle sleeve 532, and the lower sleeve 533 in the inner sleeve are fixedly connected by bolt assemblies to facilitate disassembly and maintenance and ensure the permeability of the water filter holes thereon. According to design requirements, the water filter holes are opened on the middle sleeve 532, and at the same time, it can also ensure that the spiral conveying blade 54 and the mounting shaft 541 thereon are stably installed in the inner sleeve in a relatively rotating posture.

[0045] The assembled inner sleeve can be installed into the outer sleeve 51 and the sand settling bucket 52 from the top of the outer sleeve 51 from top to bottom, and the inner sleeve and the outer sleeve 51 can be fixedly assembled by a bolt assembly.

[0046] When the above-mentioned components are fixedly assembled by bolt assemblies, sealing rubber rings are added at the connection positions of the two components to prevent leakage of the water body 7 during the transmission and discharge process.

[0047] When the spiral conveying blades 54 are running, the sand collected in the sand settling bucket 52 can enter the inner sleeve through the sand passage 5331 and be steadily lifted up under the continuous action of the spiral conveying blades 54. The water body 7 contained therein can leak out through the water filtering holes on the middle sleeve 532 and finally flow back to the drainage caisson 4.

[0048] The top of the outer sleeve 51 is exposed above the soil layer 3, which is convenient for disassembly and assembly of the inner sleeve and the outer sleeve 51, and further convenient for taking out the inner sleeve and the spiral conveyor assembled therein upward for a series of operations such as maintenance and replacement.

[0049] In order to ensure that the backfill pipe 55 can be stably installed between the inner sleeve and the wetland pond 1, an integrally formed support seat 12 is cast on the top of the wetland pond 1, and the backfill pipe 55 is assembled on the support seat 12 for stable support.

[0050] In order to ensure that the spiral conveying blade 54 can operate stably to drive the sediment in the inner sleeve to be stably lifted, the following technical solution is provided.

[0051] An assembly seat 5311 is fixedly connected to the top of the upper sleeve 531, and the sand backfill assembly also includes a driving motor 56 fixedly installed on the assembly seat 5311. A driving bevel gear 561 is fixedly connected to the output shaft of the driving motor 56. A transmission bevel gear 542 arranged on the outside of the inner sleeve is fixedly connected to the top of the installation shaft 541, and the transmission bevel gear 542 is meshed with the driving bevel gear 561.

[0052] The number of teeth of the driving bevel gear 561 is smaller than the number of teeth of the transmission bevel gear 542. When the driving motor 56 drives the installation shaft 541 and the spiral conveying blade 54 to operate through the driving bevel gear 561 and the transmission bevel gear 542, the effect of deceleration and torque increase can be achieved to drive the installation shaft 541 and the spiral conveying blade 54 to operate stably.

[0053] In order to ensure that the drainage assembly can effectively discharge the water in the drainage caisson 4 and conveniently control the infiltration amount of the water body 7 in the wetland pond 1, the following technical solution is provided.

[0054] The drainage assembly includes a water storage bucket 61, a drainage pipe 62, a water pump 63, and a switch valve 64. A connecting port 43 is opened at the downstream end of the drainage caisson 4. The water storage bucket 61 is fixedly connected to the connecting port 43 and maintains communication with the drainage caisson 4. The water pump 63 is fixedly installed on the soil layer 3. The two ends of the drainage pipe 62 are respectively connected to the upper water inlet of the water pump 63 and the bottom wall of the water storage bucket 61. The switch valve 64 is assembled on the drainage pipe 62 and arranged on the soil layer 3.

[0055] The water storage bucket 61 can effectively collect water in the drainage caisson 4, and under the action of the water pump 63, the collected water body 7 is continuously discharged through the drainage pipe 62 to ensure the continuous downward infiltration of the water body 7 in the wetland pond 1. By controlling the opening and closing degree of the switch valve 64, the discharge water volume can be adjusted, thereby controlling the infiltration volume of the water body 7 in the wetland pond 1.

[0056] In order to ensure that the silt in the drainage caisson 4 is deposited at the silt bucket 52 as much as possible, the drainage caisson 4 is provided with a slope section 44 arranged inclined upward, and the slope section 44 is placed on the downstream side of the silt bucket 52. When the water flows through the slope section 44, due to the influence of the height difference, the water flow slows down, causing the silt contained therein to be deposited in the slope section 44, and then finally gathered in the silt bucket 52, so as to facilitate the spiral conveying blades 54 to transport it upward and backfill it into the wetland pond 1.

[0057] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0058] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A controllable osmotic adjustment artificial wetland bottom drainage system, characterized by: The invention comprises a water filter layer arranged in a wetland pond (1), wherein the water filter layer comprises a river sand filling layer (21), a quartz sand filling layer (22), a gravel filling layer (23), and a high-strength permeable grid layer (24) arranged in sequence from top to bottom; a drainage interface (11) which is horizontally opposite to the high-strength permeable grid layer (24) is fixedly connected to the bottom side wall of the wetland pond (1); and a drainage caisson (4) which is buried in a soil layer (3) outside the wetland pond (1) is connected to the drainage interface (11); It also includes a sand backfill component and a drainage component mounted on the drainage caisson (4), wherein the drainage component is mounted on the downstream side of the drainage caisson (4); The sand backfill assembly comprises an outer sleeve (51), a sand settling bucket (52), an inner sleeve, a spiral conveying blade (54), and a backfill pipe (55). The outer sleeve (51) and the sand settling bucket (52) are respectively fixed to the upper and lower sides of the drainage caisson (4) and are kept vertically opposite to each other. The inner sleeve is arranged on the inner side of the outer sleeve (51) and the sand settling bucket (52), and water filtering holes are evenly opened on the inner sleeve. The spiral conveying blade (54) is fixed to the installation shaft (541), and the installation shaft (541) is rotatably installed at the axis of the inner sleeve. The two ends of the backfill pipe (55) are respectively connected to the wetland pond (1) and the top of the inner sleeve.

2. The artificial wetland bottom drainage system with controllable osmotic regulation according to claim 1 is characterized by: Aquatic plants (8) are also planted in the wetland pond (1), and the roots of the aquatic plants (8) grow in the river sand filling layer (21) and the quartz sand filling layer (22).

3. The artificial wetland bottom drainage system with controllable osmotic regulation according to claim 1 is characterized in that: An upper interface (41) and a lower interface (42) are respectively provided on the top wall and the bottom wall of the drainage caisson (4); a connection cover (511) arranged vertically opposite to the upper interface (41) is fixedly connected to the bottom of the outer sleeve (51); the drainage caisson (4) is fixedly connected to the connection cover (511) by a bolt assembly; the top outer edge of the sand settling bucket (52) is fixedly connected to the bottom wall of the drainage caisson (4) by a bolt assembly, and the sand settling bucket (52) and the lower interface (42) are kept vertically opposite to each other; The inner sleeve comprises an upper sleeve (531), a middle sleeve (532), and a lower sleeve (533) which are assembled and spliced ​​in sequence from top to bottom. A positioning ring (521) which is nested and matched with the lower sleeve (533) is provided at the bottom of the sand settling barrel (52). Sand passages (5331) are evenly provided on the side wall of the lower sleeve (533). An assembly groove which is rotatably connected with the installation shaft (541) is provided at the bottom of the lower sleeve (533). The middle sleeve (532) is nested and connected with the outer sleeve (51), and the middle sleeve (532) is fixedly connected with the top of the outer sleeve (51) by a bolt assembly. The backfill pipe (55) is connected to the upper sleeve (531), and the top of the upper sleeve (531) is rotatably connected with the installation shaft (541).

4. The artificial wetland bottom drainage system with controllable osmotic regulation according to claim 3 is characterized by: The top of the upper sleeve (531) is fixedly connected to an assembly seat (5311), and the sand backfill assembly also includes a driving motor (56) fixedly mounted on the assembly seat (5311). A driving bevel gear (561) is fixedly connected to the output shaft of the driving motor (56), and a transmission bevel gear (542) arranged on the outside of the inner sleeve is fixedly connected to the top of the installation shaft (541), and the transmission bevel gear (542) is meshed with the driving bevel gear (561).

5. The artificial wetland bottom drainage system with controllable osmotic regulation according to claim 1 is characterized by: The drainage assembly comprises a water storage bucket (61), a drainage pipe (62), a water pump (63), and a switch valve (64); a connection port (43) is provided at the downstream end of the drainage caisson (4); the water storage bucket (61) is fixedly connected to the connection port (43) and is in communication with the drainage caisson (4); the water pump (63) is fixedly installed on the soil layer (3); the two ends of the drainage pipe (62) are respectively in communication with the upper water inlet of the water pump (63) and the bottom wall of the water storage bucket (61); and the switch valve (64) is mounted on the drainage pipe (62) and arranged on the soil layer (3).

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