A surface runoff ecological purification system and method for area source pollution

Abstract

The present application relates to a kind of ecological purification system and method for surface runoff of non-point source pollution, it is related to environmental protection technical field, system includes purification pond, the top of purification pond is equipped with annular conveying line, multiple purification modules are equipped on annular conveying line;Purification module includes three-dimensional plant rack, grid assembly for being equipped in one side of three-dimensional plant rack and lifting mechanism, wherein, grid assembly is used to carry out preliminary interception to each kind of sundries in surface runoff, lifting mechanism is installed on annular conveying line, and it is used to adjust the height of three-dimensional plant rack and grid assembly;The two sides of purification pond are equipped with maintenance pond and sludge pond respectively.The three-dimensional plant rack of the system and related components can be automatically transported between different functional areas, greatly improve the operation efficiency of system, ensure that plant purification module and grid assembly can switch in the best working condition and maintenance opportunity, improve the long-term operation stability and purification efficiency of entire purification system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of environmental protection, and specifically relates to a surface runoff ecological purification system and method for non-point source pollution. BACKGROUND

[0002] Non-point source pollution refers to pollutants with uncertain distribution areas, extensive sources and non-fixed discharge points, such as pollution generated by agricultural activities, urban rainfall runoff, etc. Surface runoff is one of the main ways for non-point source pollution to enter water bodies, so it is particularly important to build an ecological purification system to reduce the impact of surface runoff on non-point source pollution.

[0003] In traditional surface runoff purification systems, fixed plant purification devices are a common way. The plants in these devices are often in the same polluted environment for a long time. With the passage of time, a large amount of pollutants will accumulate around the plant roots, causing the root activity to decrease, and the ability to absorb and degrade pollutants to gradually weaken, greatly reducing the purification efficiency.

[0004] Microbial agents, chemical agents and other specific liquids can assist plants in decomposing and transforming pollutants and enhance purification capacity. However, existing purification systems severely lack effective liquid distribution means. Some purification systems even have liquid addition devices, but they simply pour the liquid directly into the water body, which makes the liquid distribute unevenly in the water body and fails to achieve the expected purification effect.

[0005] Therefore, we provide a surface runoff ecological purification system and method for non-point source pollution to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a surface runoff ecological purification system and method for non-point source pollution to solve the problems in the background art.

[0007] The present application achieves the above-mentioned purpose through the following technical solutions:

[0008] A surface runoff ecological purification system for non-point source pollution, comprising a purification tank, an annular conveying line provided on the top of the purification tank, and a plurality of purification modules provided on the annular conveying line; the purification module comprises a three-dimensional plant rack, a grid assembly provided on one side of the three-dimensional plant rack, and a lifting mechanism, wherein the grid assembly is used for preliminary interception of various sundries in the surface runoff, the lifting mechanism is installed on the annular conveying line and is used for adjusting the height of the three-dimensional plant rack and the grid assembly; a maintenance tank and a sludge tank are respectively provided on both sides of the purification tank, and the purification module is circulated and scheduled between the purification tank, the maintenance tank and the sludge tank through the annular conveying line, wherein the three-dimensional plant rack is transferred to the maintenance tank for recovery, and the grid assembly is transferred to the sludge tank for cleaning treatment.

[0009] As a further optimization scheme of the present application, the purification tank is provided with an inlet channel and an outlet channel at two ends respectively.

[0010] As a further optimization scheme of the present application, the three-dimensional plant shelf comprises an outer frame body mounted on the lifting mechanism and an inner frame body located in the outer frame body, the bottom end of the inner frame body is rotationally connected with the outer frame body, and the top of the outer frame body is provided with a driving member for driving the rotation of the inner frame body; a plurality of uniformly distributed through holes are arranged on the inner frame body, and a plant purification module is rotationally arranged in each through hole, the plant purification module is used for planting plants suitable for corresponding water depth, and the inclination angle of the inner frame body is adjusted to match different water body height.

[0011] As a further optimization scheme of the present application, the grid assembly comprises a grid body and two bottom plates symmetrically hinged at both sides of the bottom end of the grid body; an installation plate is fixedly arranged at the top of the grid body, and the installation plate is fixed on the top of the outer frame body.

[0012] As a further optimization scheme of the present application, the grid assembly further comprises a folding unit for automatically folding and unfolding the bottom plate during lifting; the folding unit comprises a winding drum seat and a guide wheel seat fixed on the installation plate, a pull rope is wound on the winding drum seat, the pull rope passes through the guide wheel seat and is finally fixedly connected with the outer end of the bottom plate, a first gear is arranged on the cylinder shaft of the winding drum seat, a rack is fixedly arranged on the side surface of the lifting mechanism and engaged with the first gear, and when the grid assembly moves up and down with the lifting mechanism, the first gear is rotated under the engagement of the rack to drive the cylinder shaft of the winding drum seat to rotate and realize the folding and unfolding operation of the pull rope.

[0013] As a further optimization scheme of the present application, the plant purification module comprises a planting box, rotation shafts are fixedly arranged at both sides of the planting box and rotationally connected with the inner frame body; a liquid storage cylinder is fixedly arranged at the bottom of the planting box, a shell is fixedly sleeved at the lower end of the liquid storage cylinder, a plurality of liquid outlet units are arranged in the shell and uniformly distributed along the circumference of the liquid storage cylinder, a driving ring body is rotationally arranged at the upper end of the liquid storage cylinder, and the driving ring body is connected with the liquid outlet units through a mechanical linkage device to drive the intermittent liquid outlet of the plurality of liquid outlet units; a plurality of position-adjustable partition plates are arranged in the liquid storage cylinder, and the liquid storage cylinder forms a plurality of storage cavities for storing different liquids through the partition plates.

[0014] As a further optimization scheme of the present application, the liquid outlet unit comprises a liquid outlet hose connected with the liquid storage cylinder, a squeezing wheel frame rotationally arranged in the inner cavity of the shell, and a plurality of squeezing wheels uniformly distributed around the squeezing wheel frame; a second gear is fixedly arranged on the wheel shaft of the squeezing wheel frame, a plurality of arc-shaped racks are fixedly arranged on the inner wall of the driving ring body and uniformly distributed along the circumference, and when the arc-shaped racks rotate, the second gear is driven to rotate to periodically squeeze the liquid outlet hose through the squeezing wheels to push the liquid to be released into the water body intermittently.

[0015] As a further optimization of the present invention, a plurality of blades evenly distributed along the circumference are fixedly provided on the outer surface of the drive ring body, and a water flow drive unit for impacting the blades to drive the drive ring body to rotate is also provided at the bottom of the planting box. The water flow drive unit includes a water flow drive pump and a water supply pipe, and the outlet of the water supply pipe is arranged aligned with the blades.

[0016] As a further optimization of the present invention, the end of the liquid outlet hose is connected to a liquid outlet hard tube through a sleeve, and a first spring is provided between the liquid outlet hard tube and the inner wall of the housing; the bottom of the drive ring is provided with a plurality of circular grooves evenly distributed along the circumference, and a second spring is fixedly provided in each of the circular grooves. A vibration rod is fixedly provided at the bottom end of the second spring. The top of the housing is provided with a plurality of slots at the position corresponding to the liquid outlet hard tube. The end of the vibration rod slides against the top of the housing, and during the sliding process, the vibration rod periodically slides into and out of the slot to drive the liquid outlet hard tube to vibrate.

[0017] This invention also provides a method for ecological purification of surface runoff from non-point source pollution, comprising the following steps:

[0018] S1. Adjust the angle of the inner frame according to the water depth using the drive components so that the plant purification modules of each layer are evenly distributed in the water.

[0019] S2. When surface runoff enters the purification pool, it undergoes initial filtration through the grid assembly and further purification through the plants in the plant purification module.

[0020] S3. Periodically, through the cooperation of a circular conveyor line and a lifting mechanism, the plant purification modules and grid components in the purification tank are transferred to the maintenance tank and sludge tank respectively. At this time, the plant purification modules and grid components in the original maintenance tank and sludge tank are transferred to the purification tank. The maintenance tank restores the plant vitality of the plant purification modules, and the sludge tank removes accumulated debris and sediment from the grid components.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention achieves automated transportation of the three-dimensional plant rack and related components between different functional areas by setting up a ring conveyor line, lifting mechanism, maintenance pool and sludge pool, which greatly improves the system's operating efficiency, ensures that the plant purification module and grid components can be switched at the best working state and maintenance time, can extend the service life of plants, improve the purification effect of plants, and enhance the long-term operational stability and purification efficiency of the entire purification system.

[0023] 2、The present application through the setting three-dimensional plant stand, the inner frame body rotatable design, greatly improve the adaptability of three-dimensional plant stand to different water level change, through adjusting the inclination angle of inner frame body, can make each layer plant purification module always in suitable water layer depth, give full play to the purification function of different plants in different water layer, improve the purification efficiency and effect.

[0024] 3、The present application through the setting liquid storage cylinder, liquid outlet unit and drive ring body, can accurately control the release amount and release frequency of different liquid to water body, liquid can be uniformly distributed in the whole water body, improve the purification effect. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the whole structure three-dimensional schematic view of the present application;

[0026] Figure 2 It is the purification pool, maintenance pool, sludge pool structure distribution schematic view of the present application;

[0027] Figure 3 It is the three-dimensional plant stand structure schematic view of the present application;

[0028] Figure 4 It is the grid assembly structure schematic view of the present application;

[0029] Figure 5 It is the plant purification module whole structure schematic view of the present application;

[0030] Figure 6 It is the liquid outlet unit structure schematic view of the present application;

[0031] Figure 7 It is the drive ring body structure schematic view of the present application;

[0032] Figure 8 It is the shell structure schematic view of the present application.

[0033] In the drawing:

[0034] 1, purification tank; 101, water inlet channel; 102, water outlet channel; 2, annular conveying line; 3, lifting mechanism; 301, rack; 4, three-dimensional plant rack; 401, outer frame; 402, inner frame; 403, driving member; 5, grid assembly; 501, grid body; 502, bottom plate; 503, mounting plate; 504, reel seat; 505, guide wheel seat; 506, pull rope; 507, first gear; 6, maintenance tank; 7, sludge tank; 8, plant purification module; 801, planting box; 802, rotating shaft; 803, liquid storage cylinder; 803a, partition plate; 804, shell; 804a, slot; 805, liquid outlet unit; 805a, liquid outlet hose; 805b, extrusion wheel frame; 805c, extrusion wheel; 805d, second gear; 805e, liquid outlet hard pipe; 805f, first spring; 806, driving ring body; 806a, arc-shaped rack; 806b, blade; 806c, water conveying pipe; 806d, water flow driving pump; 806e, vibration rod; 806f, second spring. DETAILED DESCRIPTION

[0035] The application will be described in further detail below with reference to the drawings. It is necessary to point out here that the following detailed description is only used to further illustrate the application and cannot be understood as limiting the scope of protection of the application. Those skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0036] Example 1

[0037] In order to solve the problem that in the existing surface runoff purification system, plants are often in the same polluted environment for a long time, and with the passage of time, a large amount of pollutants will accumulate around the plant roots, resulting in a decrease in root activity and a gradual weakening of the absorption and degradation capacity of pollutants, and a significant reduction in purification efficiency, please refer to Figures 1-3This invention provides an ecological purification system for surface runoff from non-point source pollution, comprising a purification pool 1, with an inlet channel 101 and an outlet channel 102 at both ends of the purification pool 1. A circular conveyor line 2 is located at the top of the purification pool 1, and multiple purification modules (e.g., four) are mounted on the circular conveyor line 2. Two modules are located inside the purification pool 1, and two are located in maintenance pools 6 and sludge pools 7 on either side of the purification pool 1. Each purification module includes a three-dimensional plant frame 4, a mesh assembly 5 located on one side of the three-dimensional plant frame 4, and a lifting mechanism 3. The mesh assembly 5 is used for preliminary interception of various debris in the surface runoff, such as silt and other impurities. The lifting mechanism 3 is installed on the circular conveyor line 2 and is used to adjust the height of the three-dimensional plant frame 4 and the mesh assembly 5. The lifting mechanism 3 can be made of wire mesh. The mechanical structure of the lever nut can be selected according to the actual design, such as using an electric push rod; both sides of the purification pool 1 are respectively equipped with a maintenance pool 6 and a sludge pool 7. The purification module is circulated and used between the purification pool 1, the maintenance pool 6 and the sludge pool 7 through a ring conveyor line 2. Among them, the three-dimensional plant rack 4 is transferred to the maintenance pool 6 for restoration. The maintenance pool 6 is equipped with an irrigation system, a fertilization system, etc., to provide necessary nutrients for the plants. During the maintenance process, the plant purification module 8 is removed from the polluted environment of the purification pool 1 and gets sufficient rest and maintenance, so that it can maintain a good growth state and purification capacity, and prepare to return to the purification pool 1 for the next work. The grid assembly 5 is transferred to the sludge pool 7 for cleaning treatment, which can be done by high-pressure water gun washing, mechanical scraping, etc.

[0038] The three-dimensional plant rack 4 includes an outer frame 401 mounted on a lifting mechanism 3 and an inner frame 402 located inside the outer frame 401. The bottom end of the inner frame 402 is rotatably connected to the outer frame 401, and the top of the outer frame 401 is provided with a drive component 403 for driving the inner frame 402 to rotate. The drive component 403 can adopt conventional mechanical structures such as motors and belt drives. The inner frame 402 is provided with multiple evenly distributed through holes, and each through hole is rotatably provided with a plant purification module 8. The plant purification module 8 is used to plant plants suitable for the corresponding water depth. Plants with different functions are selected, such as aquatic plants, emergent plants, and submerged plants, which work together. By adjusting the tilt angle of the inner frame 402, different water heights are matched so that each layer of plant purification modules 8 is evenly distributed in the water. When the tilt angle of the inner frame 402 changes, the position of each layer of plant purification modules 8 also changes accordingly, so as to adapt to different water heights and ensure that each layer of plant purification modules 8 is in a suitable water layer position, so that different kinds of plants (aquatic plants, emergent plants, submerged plants, etc.) can exert the best purification effect.

[0039] like Figure 4As shown, the screen assembly 5 comprises a screen body 501 and two bottom plates 502 symmetrically hinged at the bottom of the screen body 501; the top of the screen body 501 is fixedly provided with a mounting plate 503, and the mounting plate 503 is fixed to the top of the outer frame body 401.

[0040] The screen assembly 5 further comprises a folding unit for automatically folding and unfolding the bottom plates 502 during lifting; the folding unit comprises a winding drum seat 504 and a guide wheel seat 505 fixed on the mounting plate 503, a pull rope 506 is wound on the winding drum seat 504, the pull rope 506 passes through the guide wheel seat 505 and is finally fixedly connected to the outer end of the bottom plate 502, a first gear 507 is arranged on the shaft of the winding drum seat 504, and a rack 301 is fixedly arranged on the side of the lifting mechanism 3 and engaged with the first gear 507; when the screen assembly 5 moves up and down with the lifting mechanism 3, the first gear 507 is rotated by the engagement of the rack 301 to drive the shaft of the winding drum seat 504 to rotate and realize the folding and unfolding operation of the pull rope 506. When working in the purification tank 1, the bottom plates 502 are naturally unfolded under the action of gravity; when the screen assembly 5 needs to be cleaned and is turned to the sludge tank 7, the bottom plates 502 can be folded by the folding unit to avoid the falling of sundries on the bottom plates 502; when the screen assembly 5 rises with the lifting mechanism 3, the rack 301 on the side of the lifting mechanism 3 engages with the first gear 507 to drive the first gear 507 to rotate and drive the shaft of the winding drum seat 504 to rotate, so that the pull rope 506 is folded and the bottom plates 502 are folded upward; when the screen assembly 5 descends with the lifting mechanism 3, the rack 301 and the first gear 507 are engaged in reverse, the winding drum seat 504 is reversed, the pull rope 506 is unfolded, and the bottom plates 502 are naturally unfolded under the action of gravity. The folding unit realizes the automatic folding and unfolding of the bottom plates 502, without manual operation, and improves the automation degree of the system.

[0041] The purification tank 1 is the core processing area of the entire ecological purification system, and the surface runoff flows into the purification tank 1 from the water inlet channel 101; in the purification tank, the water flow interacts with the plant purification modules 8 on the three-dimensional plant rack 4 and the screen assembly 5; the plants in the plant purification modules 8 absorb, adsorb and transform the pollutants in the water body, such as nitrogen, phosphorus and other nutrients, and part of organic pollutants, through their own growth metabolism; the screen assembly 5 preliminarily intercepts the larger particulate matters such as silt and sundries in the surface runoff to prevent interference with the subsequent purification process; the treated water flow flows out from the water outlet channel 102, completes the purification process, and effectively removes the non-point source pollutants in the surface runoff, so that the outflowing water body reaches a certain water quality standard.

[0042] When the three-dimensional plant shelf 4 needs to be maintained or the grid assembly 5 needs to be cleaned, the three-dimensional plant shelf 4 is lifted above the purification tank 1, the maintenance tank 6 and the sludge tank 7 by the lifting mechanism 3, and is transported to the corresponding maintenance tank 6 or sludge tank 7 position by the annular conveying line 2, and then the three-dimensional plant shelf 4 is lowered into the tank by the lifting mechanism 3 for corresponding operation, while the annular conveying line 2 transports the plant purification module 8 and the grid assembly 5 originally in the maintenance tank 6 and the sludge tank 7 to the purification tank 1 for continuous work.

[0043] Example two

[0044] On the basis of example one, in order to improve the purification effect of traditional plants on surface runoff, as shown in Figure 3 、 Figures 5-8 The plant purification module 8 comprises a planting box 801, and rotating shafts 802 connected with the inner frame body 402 are fixedly arranged on both sides of the planting box 801; a liquid storage cylinder 803 is fixedly arranged at the bottom of the planting box 801, a shell 804 is fixedly sleeved at the lower end of the liquid storage cylinder 803, a plurality of liquid outlet units 805 are arranged in the shell 804 and are uniformly distributed along the circumference of the liquid storage cylinder 803, and a driving ring body 806 is rotatably arranged at the upper end of the liquid storage cylinder 803; the driving ring body 806 is connected with the liquid outlet units 805 through a mechanical linkage device, so as to drive the plurality of liquid outlet units 805 to intermittently discharge liquid.

[0045] A plurality of position-adjustable partition plates 803a are arranged in the liquid storage cylinder 803, and the liquid storage cylinder 803 forms a plurality of storage cavities for storing different liquids, such as microbial agents, chemical agents or other nutrients, through the partition plates 803a; the storage amount and use ratio of various liquids can be flexibly adjusted according to the purification demand and the plant growth stage.

[0046] The liquid outlet unit 805 comprises a liquid outlet hose 805a connected with the liquid storage cylinder 803, a squeezing wheel frame 805b rotatably arranged in the inner cavity of the shell 804, and a plurality of squeezing wheels 805c uniformly distributed around the squeezing wheel frame 805b; a second gear 805d is fixedly arranged on the wheel shaft of the squeezing wheel frame 805b, a plurality of arc-shaped racks 806a are fixedly arranged on the inner wall of the driving ring body 806 and are uniformly distributed along the circumference; when the arc-shaped racks 806a rotate, the second gear 805d is driven to rotate, so as to periodically squeeze the liquid outlet hose 805a through the squeezing wheels 805c to push the liquid to be intermittently released into the water body. The intermittent liquid discharge mode can control the release amount and release frequency of the liquid, avoid waste caused by one-time release of too much liquid, and avoid adverse effects on the water body environment; meanwhile, the liquid discharge control is realized through the mechanical linkage device, so that the structure is simple and the reliability is high.

[0047] The outer surface of the driving ring body 806 is fixed with a plurality of blades 806b distributed along the circumference, and the bottom of the planting box 801 is also provided with a water flow driving unit for impacting the blades 806b to drive the rotation of the driving ring body 806, and the water flow driving unit comprises a water flow driving pump 806d and a water conveying pipe 806c, and the water outlet of the water conveying pipe 806c is arranged in alignment with the blades 806b.

[0048] The end of the liquid outlet hose 805a is connected with a liquid outlet hard pipe 805e through a pipe sleeve, and a first spring 805f is arranged between the liquid outlet hard pipe 805e and the inner wall of the shell 804; the bottom of the driving ring body 806 is provided with a plurality of circumferentially distributed circular grooves, and each circular groove is fixedly provided with a second spring 806f, and the bottom end of the second spring 806f is fixedly provided with a vibration rod 806e; a plurality of slot holes 804a are formed in the top of the shell 804 at positions corresponding to the liquid outlet hard pipe 805e, the end of the vibration rod 806e is in sliding fit with the top of the shell 804, and the vibration rod 806e periodically slides into and out of the slot holes 804a during the sliding process to drive the liquid outlet hard pipe 805e to vibrate. When the driving ring body 806 rotates, the end of the vibration rod 806e slides in sliding fit with the top of the shell 804, and periodically slides into and out of the slot holes 804a during the sliding process, and when the vibration rod 806e slides into the slot hole 804a, the liquid outlet hard pipe 805e is pushed to displace against the elastic force of the first spring 805f; when the vibration rod 806e slides out of the slot hole 804a, the liquid outlet hard pipe 805e is restored to the original position under the action of the first spring 805f, so that the liquid outlet hard pipe 805e vibrates, and the vibration of the liquid outlet hard pipe 805e can make the released liquid better diffuse into the water body, increase the contact area of the liquid and the water body, and improve the effect of the liquid, and at the same time, the vibration can also prevent the liquid outlet hard pipe 805e from being blocked, and ensure the normal release of the liquid.

[0049] When the plant purification module 8 works, the water flow driving pump 806d is started, water flows through the water conveying pipe 806c and is sprayed to the blades 806b, the driving ring body 806 starts to rotate, and with the rotation of the driving ring body 806, the arc-shaped rack 806a drives the second gear 805d to rotate, and the extrusion wheel 805c periodically extrudes the liquid outlet hose 805a, so that the liquid is extruded from the liquid storage cylinder 803 and released into the water through the liquid outlet hard pipe 805e, and the vibration rod 806e periodically slides into and out of the slot hole 804a during the sliding process, and the vibration generated is transmitted to the liquid outlet hard pipe 805e, thereby enhancing the diffusion effect of the liquid.

[0050] Embodiment three

[0051] The application also provides a surface runoff ecological purification method for area source pollution, comprising the following steps:

[0052] S1, according to the depth of the water body, the angle of the inner frame 402 is adjusted by the driving member 403, so that the plant purification modules 8 are uniformly distributed in the water body;

[0053] S2, when the surface runoff enters the purification tank 1, the preliminary filtration is performed by the grid assembly 5, and further purification is performed by the plants in the plant purification module 8;

[0054] During the purification process of the plant purification module 8, the specific liquid such as microbial agent, chemical agent and the like is uniformly distributed in each position of the water body by the liquid outlet unit 805 to assist the purification;

[0055] S3, periodically, the plant purification module 8 and the grid assembly 5 in the purification tank 1 are transferred to the maintenance tank 6 and the sludge tank 7 respectively by the cooperation of the annular conveying line 2 and the lifting mechanism 3, at this time, the plant purification module 8 and the grid assembly 5 in the original maintenance tank 6 and the sludge tank 7 are transferred to the purification tank 1, the plant purification module 8 is recovered by the maintenance tank 6 to restore the plant vitality, and the grid assembly 5 is removed by the sludge tank 7 to remove the accumulated sundries and sediments.

[0056] The above embodiment only expresses one embodiment of the present application, which is described in detail, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application.

Claims

1. A surface runoff ecological purification system against area pollution, comprising a purification tank (1), characterized in that: The top of the purification tank (1) is provided with an annular conveying line (2), and a plurality of purification modules are arranged on the annular conveying line (2); The purification module comprises a three-dimensional plant rack (4), a grid assembly (5) arranged on one side of the three-dimensional plant rack (4), and a lifting mechanism (3), wherein the grid assembly (5) is used for preliminarily intercepting various sundries in the surface runoff, and the lifting mechanism (3) is installed on the annular conveying line (2) and is used for adjusting the height of the three-dimensional plant rack (4) and the grid assembly (5); Both sides of the purification tank (1) are respectively provided with a maintenance tank (6) and a sludge tank (7), and the purification module is circulated and scheduled among the purification tank (1), the maintenance tank (6) and the sludge tank (7) through the annular conveying line (2), wherein the three-dimensional plant rack (4) is turned into the maintenance tank (6) for recovery, and the grid assembly (5) is turned into the sludge tank (7) for cleaning treatment; The three-dimensional plant rack (4) comprises an outer frame (401) installed on the lifting mechanism (3) and an inner frame (402) located in the outer frame (401), the bottom end of the inner frame (402) is rotationally connected with the outer frame (401), the top of the outer frame (401) is provided with a driving piece (403) for driving the inner frame (402) to rotate, a plurality of through holes are uniformly arranged on the inner frame (402), a plant purification module (8) is rotationally arranged in each through hole, plants suitable for corresponding water depth are planted in the plant purification module (8), and the inclination angle of the inner frame (402) is adjusted to match different water body heights; The plant purification module (8) comprises a planting box (801), and rotating shafts (802) rotationally connected with the inner frame (402) are fixedly arranged on both sides of the planting box (801); A liquid storage cylinder (803) is fixedly arranged at the bottom of the planting box (801), a shell (804) is fixedly sleeved at the lower end of the liquid storage cylinder (803), a plurality of liquid outlet units (805) are arranged in the shell (804) and are uniformly distributed along the circumference of the liquid storage cylinder (803), a driving ring body (806) is rotationally arranged at the upper end of the liquid storage cylinder (803), the driving ring body (806) is connected with the liquid outlet units (805) through a mechanical linkage device, so as to drive the liquid outlet units (805) to intermittently discharge liquid, a plurality of position-adjustable partition plates (803a) are arranged in the liquid storage cylinder (803), and the liquid storage cylinder (803) forms a plurality of storage cavities for storing different liquids through the partition plates (803a); The liquid outlet unit (805) comprises a liquid outlet hose (805a) in communication with the liquid storage cylinder (803), a squeezing wheel frame (805b) rotationally arranged in the inner cavity of the shell (804), and a plurality of squeezing wheels (805c) uniformly distributed around the squeezing wheel frame (805b). A second gear (805d) is fixed on the axle of the extrusion wheel frame (805b), and a plurality of arc-shaped racks (806a) evenly distributed along the circumference are fixed on the inner wall of the drive ring (806). When the arc-shaped racks (806a) rotate, they drive the second gear (805d) to rotate so that the extrusion wheel (805c) periodically extrudes the liquid hose (805a) to push the liquid to be intermittently released into the water body. Multiple blades (806b) are fixedly arranged on the outer surface of the drive ring (806) and are evenly distributed along the circumference. The bottom of the planting box (801) is also provided with a water flow drive unit for impacting the blades (806b) to drive the drive ring (806) to rotate. The water flow drive unit includes a water flow drive pump (806d) and a water supply pipe (806c). The outlet of the water supply pipe (806c) is arranged aligned with the blades (806b).

2. The ecological surface flow purification system against non-point source pollution according to claim 1, characterized in that: The purification tank (1) is provided with an inlet channel (101) and an outlet channel (102) at both ends.

3. The ecological surface flow purification system for non-point source pollution according to claim 1, characterized in that: The grid assembly (5) includes a grid body (501) and two base plates (502) symmetrically hinged to the bottom sides of the grid body (501). The top of the grid body (501) is fixedly provided with an mounting plate (503), which is fixed to the top of the outer frame (401).

4. The ecological surface flow purification system for non-point source pollution according to claim 3, characterized in that: The grid assembly (5) also includes a retraction unit for automatically retracting the base plate (502) during the lifting process; The winding and unwinding unit includes a drum seat (504) and a guide wheel seat (505) fixed on the mounting plate (503). A pull rope (506) is wound on the drum seat (504). The pull rope (506) passes around the guide wheel seat (505) and is finally fixedly connected to the outer end of the base plate (502). A first gear (507) is provided on the drum shaft of the drum seat (504). A rack (301) that meshes with the first gear (507) is fixed on the side of the lifting mechanism (3). When the grid assembly (5) moves up and down with the lifting mechanism (3), the first gear (507) is rotated by the meshing action of the rack (301) to drive the drum shaft of the drum seat (504) to rotate and realize the winding and unwinding operation of the pull rope (506).

5. The ecological treatment system for surface runoff contaminated by non-point pollution according to claim 1, characterized in that: The end of the liquid outlet hose (805a) is connected to the liquid outlet hard tube (805e) through a tube sleeve, and a first spring (805f) is provided between the liquid outlet hard tube (805e) and the inner wall of the housing (804). The bottom of the drive coil (806) is provided with a plurality of circular grooves evenly distributed along the circumference. A second spring (806f) is fixedly installed in each of the circular grooves. A vibration rod (806e) is fixedly installed at the bottom end of the second spring (806f). A plurality of slots (804a) are opened at the top of the housing (804) at the position corresponding to the liquid outlet hard tube (805e). The end of the vibration rod (806e) slides against the top of the housing (804). During the sliding process, the vibration rod (806e) periodically slides into and out of the slot (804a) to drive the liquid outlet hard tube (805e) to vibrate.

6. A method for ecological purification of surface runoff against non-point source pollution, using a system for ecological purification of surface runoff against non-point source pollution according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1. According to the water depth, adjust the angle of the inner frame (402) through the drive component (403) so that the plant purification modules (8) of each layer are evenly distributed in the water body; S2. When surface runoff enters the purification pool (1), it is initially filtered by the grid assembly (5) and then further purified by the plants in the plant purification module (8). S3. Periodically, through the cooperation of the circular conveyor line (2) and the lifting mechanism (3), the plant purification module (8) and the grid assembly (5) in the purification tank (1) are transferred to the maintenance tank (6) and the sludge tank (7) respectively. At this time, the plant purification module (8) and the grid assembly (5) in the original maintenance tank (6) and sludge tank (7) are transferred to the purification tank (1). The maintenance tank (6) restores the plant vitality of the plant purification module (8), and the sludge tank (7) removes the accumulated debris and sediment from the grid assembly (5).

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