Non-point source pollution treatment system for farmland water based on nitrogen and phosphorus indicators

Abstract

The invention discloses a farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators, relates to the technical field of farmland water non-point source pollution treatment, comprises a sedimentation net, a maintenance component, an internal control component, a floating component and a purification component, the sedimentation net is arranged in a drainage trough, a plurality of purification pits for accommodating the maintenance component are evenly distributed on the side wall of the drainage trough, the internal control component is slidably arranged inside the maintenance component, the floating component and the purification component are connected to form a purification module, the purification modules are arranged in a plurality and are arranged in a purification tank; the floating component is sleeved with an air supply pipe and floats on the water surface, the upper end of the air supply pipe is connected to an external air source and the lower end is connected to the purification component, and the purification component is arranged in the water, the whole process makes full use of the drainage channel and the purification tank space to treat the farmland drainage, reduces the occupied space, and improves the absorption and treatment efficiency of nutrients such as nitrogen and phosphorus in the drainage per unit space.

Description

Technical Field

[0001] The present application relates to the technical field of non-point source pollution treatment of farmland water, and in particular to a non-point source pollution treatment system for farmland water based on nitrogen and phosphorus indicators. Background Art

[0002] Non-point source pollution is one of the common environmental problems in the world. Among them, agricultural non-point source pollution has posed a major threat to the water environment and ecosystem. Fertilizers are seriously lost after rainfall and irrigation and drainage. Runoff containing large amounts of nitrogen and phosphorus nutrients is directly discharged into ditches, rivers, and lakes, causing eutrophication of water bodies and posing serious risks to the environment.

[0003] Usually, on the basis of ensuring the drainage ditches' functions of draining waterlogging, draining waterlogging or preventing soil salinization, auxiliary projects such as regulating dams and water retaining dams and biological measures such as aquatic plants and biological floating beds are adopted to effectively intercept, adsorb, deposit, transform, degrade and absorb nitrogen and phosphorus substances, control nutrient loss, achieve nutrient reuse and reduce water pollution. The drainage from rice fields is collected through drainage channels or pipes, and flows through sedimentation tanks, filtration and adsorption dams, aeration tanks, biological purification tanks, wetland cleansing tanks and other facilities that are beneficial to improving the purification capacity and spiritual restoration capacity of ditches and discharge areas, and absorbing and treating nitrogen and phosphorus nutrients.

[0004] However, sedimentation tanks, filtration adsorption dams, aeration tanks, biological purification tanks, wetland water purification tanks, etc. generally have problems such as large footprint, uneven coverage and treatment effects in different areas, and low efficiency.

[0005] Therefore, it is necessary to provide a non-point source pollution treatment system for farmland water based on nitrogen and phosphorus indicators to solve the problems raised in the above background technology. Summary of the invention

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a non-point source pollution treatment system for farmland water based on nitrogen and phosphorus indicators, comprising a sedimentation net, a maintenance component, an internal control component, a floating component and a purification component, wherein the sedimentation net is placed in a drainage trough, a plurality of purification pits for placing the maintenance component are evenly distributed on the side wall of the drainage trough, the internal control component is slidably arranged inside the maintenance component, the floating component and the purification component are connected to form a purification module, and the purification module is arranged in multiples and placed in a purification tank;

[0007] The maintenance assembly includes an adapter, a tube bin, a positioning spoke plate and an adjusting rotary head. The adapter is in an inverted cone shape, with a sharper end as the bottom end and a thicker end as the top end. The bottom end of the adapter is fixed to the bottom of the purification pit, and the top end of the adapter is connected to one end of the tube bin. The adjusting rotary head is arranged at the other end of the tube bin. In addition, the positioning spoke plate is circumferentially arranged on the outer wall of the tube bin.

[0008] The internal control component includes an adjustment rod, a blocking plate, a control component, a monitoring component and a floating ball. One end of the adjustment rod is connected to the blocking plate, and the other end is connected to the control component. The blocking plate is located inside the adapter. The control component extends to the inside of the adjustment rotor, and the monitoring component and the floating ball are both sleeved on the adjustment rod.

[0009] The floating component is sleeved with an air supply pipe and floats on the water surface. The upper end of the air supply pipe is connected to an external air source and the lower end is connected to a purification component, and the purification component is placed in the water.

[0010] Preferably, the drainage trough is in an inverted trapezoidal shape, and the sedimentation nets are arranged in plurality, the sedimentation net frames abut against the side walls of the drainage trough, and the sedimentation nets maintain a distance from the bottom of the drainage trough.

[0011] Preferably, a gap is reserved between the inner wall of the purification pit and the maintenance assembly to allow aquatic plants to be placed in the purification pit and grow outward, and the purification pit is opened perpendicular to the side wall of the drainage trough so that the maintenance assembly is arranged inclined upward.

[0012] Preferably, the tube bin is a hollow tube, the adjusting rotor is rotatably arranged at the tube bin port, and the adjusting rotor is provided with two right-angled connecting ports, and the direction of the connecting ports is controlled by rotating the adjusting rotor.

[0013] Preferably, the positioning spokes support the tube bin to maintain a distance from the inner wall of the purification pit, reserving space for aquatic plants to grow outwards, and a plurality of breeding slots are evenly arranged on the circumferential wall of the adapter.

[0014] Preferably, the blocking plate is located inside the adapter near the top end of the adapter.

[0015] Preferably, the regulating component includes a storage tube, a supporting spoke plate and a through-plug tube, the two ends of the storage tube are respectively connected to the regulating rod and the through-plug tube, the interior of the storage tube is connected to the through-plug tube, and the through-plug tube is slidably arranged in the regulating rotary head, the supporting spoke plates are evenly distributed on the circumferential wall of the storage tube, the outer wall of the storage tube is evenly provided with drainage outlets, and a gap is arranged between the drainage outlet and the supporting spoke plates.

[0016] Preferably, the floating assembly includes a connecting tube, a floating airbag, an adjusting connecting rod, a clamping ring, and a shift ring. The connecting tube is provided with grooves. The floating airbags are arranged in multiples and are evenly distributed around the connecting rod and fixed between the connecting tube and the clamping ring. The shift ring is located between the connecting tube and the clamping ring. The connecting tube, the shift ring, and the clamping ring are jointly sleeved on the air supply pipe. The connecting rod is adjusted to control the multiple floating airbags to move away from or closer to each other.

[0017] Preferably, the purification component includes a support ring plate and an aeration head, wherein the support ring plates are arranged in plurality and are stacked on top of each other, and the support ring plates are sleeved on the air supply pipe, and the aeration head is fixedly arranged on the lowest support ring plate and is connected to the air supply pipe.

[0018] Preferably, a plurality of sieve holes and through grooves are provided on the support ring plate, and the support ring plate is in an inverted bowl shape.

[0019] Compared with the prior art, the present application provides a farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators, which has the following beneficial effects:

[0020] In the present application, a drainage channel is provided with a drainage trough, and debris is retained and intercepted by a sedimentation net. By adjusting the direction of the regulating rotor, part of the farmland return water is controlled to enter the pipe bin, and the farmland return water enters from the bottom of the purification pit and is relatively retained to fill the purification pit, so as to achieve short-term storage of the farmland return water to provide nutrients for aquatic plants for purification, and the direction of the regulating rotor is periodically adjusted to control new farmland return water to enter the pipe bin, and the original farmland return water that has been preliminarily purified in the purification pit is discharged from the purification pit outlet into the drainage trough, so as to achieve high-frequency circulation purification of farmland return water;

[0021] The farmland drainage water after preliminary treatment is circulated to the purification pool for further purification. A variety of submerged and floating aquatic plants, as well as some fish that filter phytoplankton in the water body, are cultivated in the purification pool. The through slot allows the oxygen output by the aeration head to pass through multiple support ring plates. The sieve holes are used to accommodate more aquatic plants. The purification capacity of the purification pool is fully utilized and improved through the layers of support ring plates. The position of the purification component in the purification pool is adjusted with the help of the floating component to avoid the generation of dead corners.

[0022] The entire process fully utilizes the space of drainage channels and purification pools to treat farmland drainage, reducing the occupied space and improving the efficiency of absorbing and treating nutrients such as nitrogen and phosphorus in drainage per unit space. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0024] Figure 1 This is a schematic diagram of the placement of maintenance components for the farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators;

[0025] Figure 2 It is a schematic diagram of the structure of the maintenance components of the farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators;

[0026] Figure 3 It is a schematic diagram of the internal control component structure of the farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators;

[0027] Figure 4 It is a schematic diagram of the control component structure of the farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators;

[0028] Figure 5 It is a schematic diagram of the floating component and purification component structure of the farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators;

[0029] In the figure: 1. drainage trough; 2. sedimentation net; 3. purification pit; 4. maintenance component; 41. adapter; 411. breeding trough hole; 42. pipe warehouse; 43. positioning radial plate; 44. adjusting rotor; 441. connecting port; 5. internal control component; 51. adjusting rod; 52. plugging plate; 53. regulating component; 531. storage tube; 532. drainage port; 533. supporting radial plate; 534. through-plug tube; 54. monitoring component; 55. floating ball; 6. floating component; 61. connecting tube; 62. groove; 63. floating airbag; 64. adjusting connecting rod; 65. clamping ring; 66. shift ring; 7. purification component; 71. supporting ring plate; 711. through groove; 712. sieve hole; 72. aeration head; 8. air supply pipe. DETAILED DESCRIPTION

[0030] See also Figure 1-Figure 5 In the embodiment of the present application, the farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators includes a sedimentation net 2, a maintenance component 4, an internal control component 5, a floating component 6 and a purification component 7. The sedimentation net 2 is placed in a drainage trough 1, and a plurality of purification pits 3 for placing the maintenance component 4 are evenly distributed on the side wall of the drainage trough 1. The internal control component 5 is slidably arranged inside the maintenance component 4, and the floating component 6 and the purification component 7 are connected to form a purification module. The purification module is arranged in multiples and placed in the purification tank;

[0031] The maintenance component 4 includes an adapter 41, a tube bin 42, a positioning spoke 43 and an adjusting rotary head 44. The adapter 41 is in an inverted cone shape, with a sharper end as the bottom end and a thicker end as the top end. The bottom end of the adapter 41 is fixed to the bottom of the purification pit 3, and the top end of the adapter 41 is connected to one end of the tube bin 42. The adjusting rotary head 44 is arranged at the other end of the tube bin 42. In addition, the positioning spoke 43 is circumferentially arranged on the outer wall of the tube bin 42.

[0032] The internal control component 5 includes an adjusting rod 51, a blocking plate 52, a regulating component 53, a monitoring component 54 and a floating ball 55. One end of the adjusting rod 51 is connected to the blocking plate 52, and the other end is connected to the regulating component 53. The blocking plate 52 is located inside the adapter 41. The regulating component 53 extends to the inside of the regulating rotating head 44. The monitoring component 54 and the floating ball 55 are both sleeved on the adjusting rod 51.

[0033] The floating component 6 is sleeved with the air supply pipe 8 and floats on the water surface. The upper end of the air supply pipe 8 is connected to an external air source and the lower end is connected to the purification component 7, and the purification component 7 is placed in the water.

[0034] It needs to be explained that, in order to improve the existing sewage treatment process of purifying farmland return water in sequence through drainage channels, sedimentation tanks, filtration adsorption dams, aeration tanks and biological purification tanks, this application only provides sewage treatment facilities in which farmland, drainage channels and purification tanks are connected in sequence, and a supporting treatment system is used for sewage treatment, wherein a drainage trough 1 is provided in the drainage channel, and debris is retained and intercepted by a sedimentation net 2, and nutrients such as nitrogen and phosphorus in the farmland return water are absorbed and treated by controlling the flow of farmland return water with the help of a maintenance component 4 in a purification pit 3, wherein aquatic plants are cultivated in the purification pit 3;

[0035] The farmland water that has been initially treated flows to the purification pool for further purification. A variety of submerged and floating aquatic plants, as well as some fish that filter and feed on phytoplankton in the water body, are cultivated in the purification pool. At the same time, the purification pool contains more aquatic plants through the purification component 7, and aeration treatment is performed. The position of the purification component 7 in the purification pool is adjusted with the help of the floating component 6 to avoid dead corners.

[0036] The entire process fully utilizes the space of drainage channels and purification pools to treat farmland drainage, reducing the occupied space and improving the efficiency of absorbing and treating nutrients such as nitrogen and phosphorus in drainage per unit space.

[0037] As a preferred embodiment, the drainage trough 1 is in an inverted trapezoidal shape, and the sedimentation nets 2 are arranged in plurality. The frame of the sedimentation net 2 abuts against the side wall of the drainage trough 1, and the sedimentation net 2 maintains a distance from the bottom of the drainage trough 1, so as to facilitate the subsequent segmented removal of the sedimentation net 2 and take out the debris fallen on the sedimentation net 2 to complete the cleaning, thereby avoiding the accumulation of debris at the bottom of the drainage trough 1 to cause blockage and difficulty in cleaning.

[0038] As a preferred embodiment, a gap is reserved between the inner wall of the purification pit 3 and the maintenance component 4 to allow aquatic plants to be placed in the purification pit 3 and grow outward, and the purification pit 3 is opened perpendicular to the side wall of the drainage trough 1 so that the maintenance component 4 is arranged tilted upward, which is convenient for retaining farmland drainage water in the purification pit 3 to feed the aquatic plants therein.

[0039] As a preferred embodiment, the tube bin 42 is a hollow tube, the adjusting rotor 44 is rotatably arranged at the port of the tube bin 42, and the adjusting rotor 44 is provided with two right-angled connecting ports 441. The direction of the connecting ports 441 is controlled by rotating the adjusting rotor 44, and the connecting ports 441 are controlled to be opposite to the flow direction of farmland drainage water. The drainage water from the farmland can flow into the adjusting rotor 44 with the help of flow inertia, and the connecting ports 441 are controlled to be in the same direction as the flow direction of farmland drainage water to prevent the drainage water from flowing into the adjusting rotor 44.

[0040] As a preferred embodiment, the positioning spoke plate 43 supports the tube bin 42 to maintain a distance from the inner wall of the purification pit 3, reserving space for aquatic plants to grow outward, and a plurality of breeding slots 411 are evenly opened on the circumferential wall of the adapter 41, and the breeding slots 411 allow the roots of aquatic plants to pass through and fix the roots of aquatic plants, and the farmland drainage water flowing out of the breeding slots 411 provides water and nutrients for the growth of aquatic plants, absorbs excess nutrients in the farmland drainage water, and avoids polluting the environment.

[0041] As a preferred embodiment, the blocking plate 52 is located inside the adapter 41 near the top of the adapter 41 , and the blocking plate 52 slides along with the adjusting rod 51 to adjust the adapter 41 to be connected with the tube bin 42 .

[0042] It should be explained that the farmland drainage enters the regulating rotor 44, passes through the regulating component 53 and flows to the inside of the pipe bin 42, and the farmland drainage inside the pipe bin 42 flows out to the bottom of the purification pit 3 through the breeding slot 411, providing nutrients for the aquatic plants in the purification pit 3, wherein the floating ball 55 is passively adjusted and floated by the amount of farmland drainage in the pipe bin 42, driving the regulating rod 51 to move, and at the same time the monitoring component 54 monitors the components in the farmland drainage;

[0043] By adjusting the direction of the regulating rotor 44 to control part of the farmland drainage water to enter the pipe bin 42, the farmland drainage water enters from the bottom of the purification pit 3 and is relatively retained to fill the purification pit 3, thereby realizing short-term storage of the farmland drainage water to provide nutrients for aquatic plants for purification, and periodically adjusting the direction of the regulating rotor 44 to control new farmland drainage water to enter the pipe bin 42, and the original farmland drainage water that has been preliminarily purified in the purification pit 3 is discharged from the outlet of the purification pit 3 into the drainage trough 1, thereby realizing high-frequency circulation purification of farmland drainage water.

[0044] As a preferred embodiment, the regulating component 53 includes a storage tube 531, a supporting spoke plate 533 and a through-plug tube 534, the two ends of the storage tube 531 are respectively connected to the regulating rod 51 and the through-plug tube 534, the interior of the storage tube 531 is connected to the through-plug tube 534, and the through-plug tube 534 is slidably arranged in the regulating rotary head 44, the supporting spoke plates 533 are evenly distributed on the circumferential wall of the storage tube 531, the outer wall of the storage tube 531 is evenly distributed with drainage outlets 532, and a gap is set between the drainage outlet 532 and the supporting spoke plates 533.

[0045] It should be explained that the plug tube 534 is hollow, and the upper end opening of the plug tube 534 abuts against the adjusting rotating head 44 under the drive of the adjusting rod 51 to block the connection.

[0046] In this embodiment, Figure 5 The floating component 6 includes a connecting pipe 61, a floating airbag 63, an adjusting connecting rod 64, a snap ring 65, and a shift ring 66. The connecting pipe 61 is provided with grooves 62, which can facilitate the attachment of more aquatic plants. The floating airbags 63 are arranged in multiples and are evenly fixed between the connecting pipe 61 and the snap ring 65 by adjusting the connecting rod 64. The shift ring 66 is located between the connecting pipe 61 and the snap ring 65. The connecting pipe 61, the shift ring 66 and the snap ring 65 are jointly sleeved with the air supply pipe 8. The connecting rod 64 is adjusted to control the multiple floating airbags 63 to move away from or close to each other, which can adapt to different corner positions and adjust the stability of the floating component 6 and the connected purification component 7.

[0047] In this embodiment, Figure 5 The purification component 7 includes a support ring plate 71 and an aeration head 72. The support ring plates 71 are multiple and overlapped with each other, and the support ring plates 71 are sleeved on the air supply pipe 8. The aeration head 72 is fixedly arranged on the lowest support ring plate 71, and the aeration head 72 is connected to the air supply pipe 8.

[0048] As a preferred embodiment, a plurality of sieve holes 712 and through grooves 711 are provided on the support ring plate 71, and the support ring plate 71 is in an inverted bowl shape. The through grooves 711 allow the oxygen output by the aeration head 72 to pass through the plurality of support ring plates 71, and the sieve holes 712 are used to accommodate more aquatic plants, so that the purification capacity of the purification pool can be fully utilized and improved through the layers of support ring plates 71.

[0049] In the specific implementation, a drainage channel is provided with a drainage trough 1, and debris is retained and intercepted by a sedimentation net 2. By adjusting the direction of the regulating rotor 44, part of the farmland drainage is controlled to enter the pipe bin 42, and the farmland drainage enters from the bottom of the purification pit 3 and is relatively retained to fill the purification pit 3, so as to achieve short-term storage of the farmland drainage to provide nutrients for aquatic plants for purification, and the regulating rotor 44 is periodically adjusted to control the direction of new farmland drainage to enter the pipe bin 42, and the original farmland drainage that has been preliminarily purified in the purification pit 3 is discharged from the outlet of the purification pit 3 into the drainage trough 1, so as to achieve high-frequency circulation purification of farmland drainage;

[0050] The farmland drainage water after preliminary treatment is circulated to the purification pool for further purification. A variety of submerged and floating aquatic plants, as well as some fish that filter phytoplankton in the water body, are cultivated in the purification pool. The through groove 711 allows the oxygen output by the aeration head 72 to pass through multiple support ring plates 71. The sieve holes 712 are used to accommodate more aquatic plants. The purification capacity of the purification pool is fully utilized and improved through the layers of support ring plates 71. The position of the purification component 7 in the purification pool is adjusted with the help of the floating component 6 to avoid the generation of dead corners.

[0051] The entire process fully utilizes the space of drainage channels and purification pools to treat farmland drainage, reducing the occupied space and improving the efficiency of absorbing and treating nutrients such as nitrogen and phosphorus in drainage per unit space.

[0052] What has been described above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed in the present application according to the technical solution and application concept of the present application, which should be covered by the protection scope of the present application.

Claims

1. The farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators is characterized by: The device comprises a sedimentation net (2), a curing component (4), an internal control component (5), a floating component (6) and a purification component (7), wherein the sedimentation net (2) is arranged in a drainage trough (1), a plurality of purification pits (3) for accommodating the curing component (4) are evenly distributed on the side wall of the drainage trough (1), the internal control component (5) is slidably arranged inside the curing component (4), the floating component (6) and the purification component (7) are connected to form a purification module, and the purification module is arranged in a plurality and arranged in a purification tank; The maintenance component (4) comprises an adapter (41), a tube bin (42), a positioning spoke (43) and an adjusting rotary head (44); the adapter (41) is in an inverted cone shape, with a sharper end being the bottom end and a thicker end being the top end; the bottom end of the adapter (41) is fixed to the bottom of the purification pit (3), and the top end of the adapter (41) is connected to one end of the tube bin (42); the adjusting rotary head (44) is arranged at the other end of the tube bin (42); and the positioning spoke (43) is circumferentially arranged on the outer wall of the tube bin (42); The pipe bin (42) is a hollow pipe, the regulating rotating head (44) is rotatably arranged at the port of the pipe bin (42), and the regulating rotating head (44) is provided with two right-angled communication ports (441), and the direction of the communication ports (441) is controlled by rotating the regulating rotating head (44), and the communication ports (441) are controlled to be opposite to the flow direction of farmland drainage water, so that the farmland drainage water flows into the regulating rotating head (44) by means of flow inertia, and the communication ports (441) are controlled to be in the same direction as the flow direction of farmland drainage water, so as to prevent the farmland drainage water from flowing into the regulating rotating head (44); The internal control component (5) comprises an adjusting rod (51), a blocking plate (52), a regulating component (53), a monitoring component (54) and a floating ball (55); one end of the adjusting rod (51) is connected to the blocking plate (52), and the other end is connected to the regulating component (53); the blocking plate (52) is located inside the adapter (41); the regulating component (53) extends to the inside of the regulating rotating head (44); and the monitoring component (54) and the floating ball (55) are both sleeved on the adjusting rod (51); The floating component (6) is sleeved with an air supply pipe (8) and floats on the water surface; the upper end of the air supply pipe (8) is connected to an external air source and the lower end is connected to a purification component (7); and the purification component (7) is placed in the water.

2. The farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators according to claim 1 is characterized in that: The drainage trough (1) is in the shape of an inverted trapezoid, and the sedimentation nets (2) are arranged in a plurality, the frame of the sedimentation net (2) abuts against the side wall of the drainage trough (1), and the sedimentation net (2) maintains a distance from the bottom of the drainage trough (1).

3. The farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators according to claim 1 is characterized in that: A gap is retained between the inner wall of the purification pit (3) and the maintenance component (4) to allow aquatic plants to be placed in the purification pit (3) and grow outwards, and the purification pit (3) is opened vertically to the side wall of the drainage trough (1) so that the maintenance component (4) is arranged tilted upward.

4. The farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators according to claim 1 is characterized in that: The positioning spokes (43) support the tube bin (42) to maintain a distance from the inner wall of the purification pit (3), leaving space for aquatic plants to grow outwards, and a plurality of breeding slots (411) are evenly arranged on the circumferential wall of the adapter (41).

5. The farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators according to claim 1 is characterized in that: The blocking plate (52) is located inside the adapter (41) and close to the top end of the adapter (41).

6. The farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators according to claim 1 is characterized by: The regulating component (53) comprises a storage tube (531), a supporting spoke plate (533) and a through-plug tube (534); two ends of the storage tube (531) are respectively connected to the regulating rod (51) and the through-plug tube (534); the interior of the storage tube (531) is communicated with the through-plug tube (534), and the through-plug tube (534) is slidably arranged in the regulating rotating head (44); the supporting spoke plates (533) are evenly distributed on the circumferential wall of the storage tube (531); the outer wall of the storage tube (531) is evenly distributed with drainage openings (532), and a gap is provided between the drainage openings (532) and the supporting spoke plates (533).

7. The farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators according to claim 1 is characterized by: The floating assembly (6) comprises a connecting pipe (61), a floating airbag (63), an adjusting connecting rod (64), a snap ring (65), and a shift ring (66). The connecting pipe (61) is provided with grooves (62). The floating airbags (63) are arranged in a plurality and are evenly distributed around the circumference and fixed between the connecting pipe (61) and the snap ring (65) through the adjusting connecting rod (64). The shift ring (66) is located between the connecting pipe (61) and the snap ring (65). The connecting pipe (61), the shift ring (66), and the snap ring (65) are jointly sleeved with the air supply pipe (8). The adjusting connecting rod (64) is used to control the plurality of floating airbags (63) to move away from or closer to each other.

8. The farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators according to claim 1 is characterized by: The purification component (7) comprises a supporting ring plate (71) and an aeration head (72); the supporting ring plates (71) are arranged in a plurality and are stacked on top of each other, and the supporting ring plates (71) are sleeved on the air supply pipe (8); the aeration head (72) is fixedly arranged on the lowest supporting ring plate (71), and the aeration head (72) is connected to the air supply pipe (8).

9. The farmland water non-point source pollution treatment system based on nitrogen and phosphorus indicators according to claim 8 is characterized by: The support ring plate (71) is provided with a plurality of sieve holes (712) and through grooves (711), and the support ring plate (71) is in the shape of an inverted bowl.

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