A farmland water use wetland water quality purification treatment device

Abstract

The application discloses a farmland water quality purification treatment device for wetlands, relates to the technical field of green energy-saving and environment-friendly water treatment and farmland water conservancy engineering, and is installed in the inside of a ditch between farmlands, and the side of the farmland is provided with a tail water guide opening groove, and the device comprises a flow guide plate arranged in the tail water guide opening groove, one end of the flow guide plate is fixedly connected with a treatment cylinder, the side of the treatment cylinder is provided with a through groove, the inside of the treatment cylinder is provided with a two-stage water treatment mechanism, the bottom of the treatment cylinder is in contact with the bottom of the ditch, the side of the treatment cylinder is provided with a communication pipe, the communication pipe is used for balancing the water level between the inside of the treatment cylinder and the inside of the ditch, the two-stage water treatment mechanism comprises a first water treatment module arranged on the top of the treatment cylinder and a second water treatment module fixedly arranged in the inside of the treatment cylinder, and the second water treatment module is a wetland water quality purification mode; the device can realize automatic grading filtration and deep ecological purification of farmland tail water, does not need manual frequent unblocking and inspection, greatly reduces the operation and maintenance difficulty in the field, and stably improves the purification quality and treatment efficiency of the farmland tail water.

Description

Technical Field

[0001] This invention belongs to the field of green, energy-saving and environmentally friendly water treatment and farmland water conservancy engineering technology, and particularly relates to a farmland water utilization wetland water quality purification treatment device. Background Technology

[0002] Agricultural wastewater is a major carrier of agricultural non-point source pollution. Excessive application of nitrogen and phosphorus fertilizers during crop cultivation results in agricultural wastewater flowing back into irrigation ditches and canals. This wastewater accumulates nitrogen and phosphorus, as well as suspended solids, easily leading to eutrophication, ditch blockage, and water quality deterioration, severely impacting irrigation water quality and the regional agricultural water environment. Currently, the purification and treatment of agricultural wastewater mainly employs conventional methods such as artificial wetlands, planting aquatic plants in ditches, and simple sedimentation tanks. However, these methods have many substantial shortcomings in practical field applications.

[0003] First, traditional constructed wetlands are mostly large-area pond-style structures, requiring separate land for excavation and construction. However, farmland has limited space along ditches and field ridges, making them unsuitable for scattered, small-space field deployments. Large-area wetland structures also easily occupy farmland, disrupt the original irrigation layout, and have extremely poor feasibility. Second, existing ditch-type purification structures have limited functionality, relying solely on natural plant adsorption or simple filter media. They lack a tiered purification structure and are insufficient in their ability to treat suspended solids, organic pollutants, and nitrogen and phosphorus components in farmland effluent. This results in low purification efficiency, large fluctuations in effluent quality, and an inability to consistently meet farmland irrigation reuse standards.

[0004] Furthermore, existing farmland wastewater purification equipment generally suffers from problems such as easy clogging, lack of early warning systems, and cumbersome operation and maintenance. Farmland wastewater has a high sediment content, and long-term operation easily leads to blockage of the filler pores and impeded water flow, causing the wetland to become an anaerobic environment, breeding harmful substances and losing its purification function. Traditional equipment cannot monitor the thickness of blockages and water quality in real time, relying solely on regular manual inspections, resulting in high maintenance costs, delayed fault detection, and poor long-term operational stability. At the same time, existing equipment mostly relies on municipal power, which is unavailable in fields and remote areas. External wiring is cumbersome, costly, and unsafe, making it difficult to achieve intelligent, low-energy, and long-term operation.

[0005] In addition, existing purification devices are mostly integrated fixed structures, making disassembly, maintenance, and replacement of packing materials extremely inconvenient and unable to achieve modular disassembly and maintenance. Furthermore, the lack of directional flow guidance and anti-scattering structures at the connection between ditches and farmland tailwater allows tailwater to flow erratically, easily causing local water flow impacts and exacerbating equipment siltation and blockage. Simultaneously, the lack of a water level balancing structure means that fluctuations in ditch water levels can affect the internal hydraulic conditions of the equipment, further reducing the stability and sustainability of farmland tailwater purification. Based on these numerous shortcomings of existing technologies, there is an urgent need for a farmland water utilization wetland water quality purification device that is adaptable to confined field spaces, features modular and graded purification, has built-in anti-blockage warning, is self-powered by solar energy, and is easy to operate and maintain. Summary of the Invention

[0006] The purpose of this invention is to provide a wetland water purification and treatment device for farmland water utilization. It addresses the technical problems of existing farmland wastewater purification equipment, such as large footprint, poor adaptability, susceptibility to clogging, lack of self-anti-clogging structure, single purification level, lack of intelligent monitoring and maintenance, reliance on mains power, and cumbersome maintenance. This invention designs a wetland purification device that is adaptable to the confined spaces of field ditches, features modular and graded purification, dynamic self-anti-clogging function, solar self-powered operation, and real-time monitoring and early warning capabilities. This device can achieve automatic graded filtration and deep ecological purification of farmland wastewater, eliminating the need for frequent manual cleaning and inspection, significantly reducing the difficulty of field maintenance, and steadily improving the purification quality and efficiency of farmland wastewater. It solves the industry pain points of existing farmland wetland purification equipment, such as limited deployment, susceptibility to siltation, poor purification stability, low level of intelligence, and high maintenance costs. It is suitable for scattered field wastewater treatment scenarios and meets the needs of ecological treatment and irrigation reuse of farmland wastewater.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A wetland water purification device for farmland water utilization is installed inside a ditch in a farmland. The farmland and the ditch are connected by a tailwater guiding channel set on the side of the farmland. The tailwater guiding channel is located on the ridge and includes a guide plate placed inside the tailwater guiding channel. A treatment cylinder is fixed to the end of the guide plate away from the tailwater guiding channel. A through groove is provided on the side of the treatment cylinder, which is connected to the guide plate and is set off from the axis of the treatment cylinder. A secondary water treatment mechanism is provided inside the treatment cylinder. The bottom of the treatment cylinder is in contact with the bottom of the ditch. A connecting pipe is provided on the side of the treatment cylinder to balance the water level inside the treatment cylinder and the ditch. The secondary water treatment mechanism includes a first water treatment module that can be taken out from the top of the treatment cylinder and a second water treatment module fixed inside the treatment cylinder. The second water treatment module is in wetland water purification mode and is located below the first water treatment module.

[0008] As a preferred embodiment of the present invention, both the field ridge and the ditch are provided with fixing grooves.

[0009] As a preferred embodiment of the present invention, connecting plates are bolted to both sides of the processing cylinder, and a horizontal plate is welded to the end of the connecting plate away from the processing cylinder. The horizontal plate is inserted into the fixing groove, and the space between the horizontal plate and the bottom of the fixing groove is filled by concrete pouring.

[0010] As a preferred embodiment of the present invention, comb teeth are fixed inside the through groove, and a plurality of comb teeth are equidistantly arranged along the arc-shaped bending direction of the through groove.

[0011] As a preferred embodiment of the present invention, the first water treatment module includes a filter element placed inside the treatment cylinder. The bottom of the filter element is provided with a plurality of filter holes. A limiting plate and a support plate fixed on the inner wall of the treatment cylinder are provided on the side of the filter element. The bottom of the filter element is placed on the surface of the support plate. The surface of the limiting plate is flush with the surface of the filter element. The limiting plate wraps around the outer periphery of the filter element.

[0012] As a preferred embodiment of the present invention, the top of the processing cylinder is provided with a stepped groove, and a perforated cover plate is placed inside the stepped groove. A connecting rod is fixed to the inside of the processing cylinder with the perforated cover plate. A plurality of connecting rods are provided along the circumferential direction of the perforated cover plate, and the other end of the plurality of connecting rods is fixed to the top of the filter element.

[0013] As a preferred embodiment of the present invention, a waterproof protective cover is also fixed inside the filter element. The waterproof protective cover is provided with a bearing. There are two waterproof protective covers, which are symmetrically arranged. The waterproof protective cover away from the filter element end is fixed between all the connecting rods. A rotating shaft is installed between the two opposing bearings. Several spiral blades are fixed on the side of the rotating shaft. The spiral blades are inclined and all the spiral blades are located below the through groove.

[0014] As a preferred embodiment of the present invention, the second water treatment module includes a composite biological purification packing material, which has a three-layer structure: a lower layer is a coarse-grained volcanic rock support layer, a middle layer is a three-dimensional elastic biological packing material, and an upper layer is a wetland aquatic plant planting layer. A support frame is provided at the bottom of the composite biological purification packing material, and the coarse-grained volcanic rock support layer is placed on the support frame.

[0015] As a preferred embodiment of the present invention, it further includes a control box installed on a ditch or field ridge. The control box integrates a main control chip, which is electrically connected to a power supply module. The power supply module is electrically connected to a solar power supply component. The main control chip is also electrically connected to a water quality monitoring sensor module and a laser beam switch. The laser beam switch is electrically connected to an alarm light, which is powered by the power supply module. The water quality monitoring sensor is installed on the inner wall of the treatment cylinder, near the connecting pipe. The laser beam switch is installed on the inner wall of the filter element to monitor the thickness of the accumulated soil inside the filter element.

[0016] In summary, the beneficial technical effects of the present invention are as follows: Compared with the prior art, the present invention has significant advantages in many aspects such as structural layout, purification performance, intelligent operation and maintenance, and adaptability to various scenarios, and its inventiveness and practicality are outstanding.

[0017] First, this invention adopts a field ridge trenching and diversion system with a cylindrical modular integrated structure, abandoning the traditional large-area wetland pond structure. It directly utilizes the narrow space of field ridges and ditches for embedded installation, eliminating the need to excavate new ponds and occupying arable land. It is perfectly suited to the scattered and small-space layout of farmland. At the same time, through the off-axis through-channel, arc-shaped comb-tooth pre-positioned pollution interception, and water level balancing structure of the connecting pipe, it effectively solves the problems of turbulent water flow, easy siltation, and unstable hydraulic conditions of traditional ditch purification equipment, greatly improving the engineering feasibility and operational stability of the field tailwater purification device.

[0018] Secondly, this invention employs a two-tiered, progressive purification structure to achieve precise, graded treatment of farmland effluent. The first water treatment module, relying on self-rotating spiral blades and a detachable filter element structure, achieves dynamic pre-filtration of suspended sediment and self-prevention of clogging, solving the technical problems of traditional wetland devices being prone to clogging, hardening, and cumbersome maintenance. The second water treatment module adopts a three-layer composite wetland biological purification structure, combining multiple purification mechanisms such as volcanic rock support, elastic packing material microbial degradation, and aquatic plant adsorption. It specifically removes high concentrations of nitrogen, phosphorus, and organic pollutants from farmland effluent, with clear purification levels, high treatment efficiency, and stable effluent quality that meets the standards for farmland irrigation reuse, effectively improving the eutrophication problem in farmland ditches.

[0019] Finally, this invention incorporates a complete solar-powered self-sufficient intelligent monitoring and early warning system, adaptable to field conditions without mains power, achieving zero-energy autonomous power supply operation. Through an industrial-grade main control chip, high-precision water quality sensors, and laser-guided blockage monitoring components, it can monitor the effluent water quality and filter cartridge siltation status in real time. Automatic audible and visual alarms are triggered when blockage exceeds standards or water quality is abnormal, enabling early warning of faults and precise operation and maintenance. This completely changes the traditional operation and maintenance model of constructed wetlands, which relies on regular manual inspections and delayed fault detection, significantly reducing manual maintenance costs, extending equipment lifespan, and simultaneously achieving the resource reuse of farmland tailwater. It combines ecological governance and water-saving irrigation benefits, meeting the needs of modern green farmland water conservancy construction. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a farmland water utilization wetland water purification and treatment device according to this embodiment; Figure 2 This is a schematic diagram of the treatment cylinder structure of a farmland water utilization wetland water purification treatment device according to this embodiment; Figure 3 This is a schematic diagram of the interior of the treatment cylinder of a wetland water purification device for farmland water utilization in this embodiment.

[0021] In the diagram: 1. Ditch; 2. Farmland; 3. Tailwater channel; 4. Guide plate; 5. Treatment cylinder; 6. Through channel; 7. Connecting pipe; 8. Fixing channel; 9. Connecting plate; 10. Horizontal plate; 11. Comb teeth; 12. Filter element; 13. Filter holes; 14. Limiting plate; 15. Support plate; 16. Stepped channel; 17. Cover plate with mesh; 18. Connecting rod; 19. Waterproof protective cover; 20. Bearing; 21. Rotating shaft; 22. Spiral blade; 23. Coarse-grained volcanic rock support layer; 24. Three-dimensional elastic biological filler; 25. Wetland aquatic plant planting layer; 26. Support frame; 27. Laser beam switch; 28. Water quality monitoring sensor module. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] The present invention will be further described in detail below with reference to specific embodiments. The present invention is a wetland water purification treatment device for farmland 2, which is suitable for the narrow installation space of farmland 2 field ridges and narrow field ditches 1. It realizes the directional flow purification of farmland 2 tailwater by relying on the tailwater channel 3 of the field ridge. It adopts a modular two-stage water treatment structure and a solar-powered intelligent electronic control monitoring system to realize the integrated functions of farmland 2 tailwater impurity pre-filtration, dynamic anti-clogging, wetland deep purification, real-time water quality monitoring and fault early warning. The overall structure is compact, requires no land, and is suitable for complex field conditions.

[0024] The entire device is installed inside the ditch 1 of farmland 2. Farmland 2 and ditch 1 are connected by a tailwater guiding channel 3 cut into the side ridge of farmland 2. A guide plate 4 is placed inside the tailwater guiding channel 3. A vertically arranged treatment cylinder 5 is fixedly installed at one end of the guide plate 4 near the tailwater guiding channel 3. The treatment cylinder 5 is laid in close contact with the bottom of ditch 1 without any gaps to prevent short-circuiting of the tailwater. A through-hole 6 off-center from its own central axis is opened on the side wall of the treatment cylinder 5. The through-hole 6 is precisely connected to the end of the guide plate 4, so that the tailwater from farmland 2 is directed into the interior of the treatment cylinder 5 through the guide plate 4 and the through-hole 6. The off-axis opening design can extend the tailwater inlet path, prevent the water flow from directly impacting the internal structure, and reduce water flow impact disturbance. Multiple arc-shaped comb teeth 11 are fixedly installed inside the through groove 6. The multiple comb teeth 11 are arranged in an equidistant array along the arc-shaped bending direction of the through groove 6, which can initially intercept straw, weeds, and large floating debris, achieve primary physical interception of dirt, and prevent large impurities from entering the cylinder and causing blockage.

[0025] Rectangular fixing grooves 8 are pre-set on the sides of both the field ridge and the ditch 1. Vertical connecting plates 9 are symmetrically bolted to the left and right sides of the treatment cylinder 5. A horizontal plate 10 is welded to the end of the connecting plate 9 away from the treatment cylinder 5. The horizontal plate 10 is inserted into the fixing groove 8 with gaps. Waterproof and frost-resistant concrete is poured and solidified between the horizontal plate 10 and the bottom and side wall of the fixing groove 8 to achieve a stable installation of the treatment cylinder 5, resisting water flow impact and field settlement. The installation structure is firm and has strong sealing performance, suitable for long-term harsh outdoor working conditions in the field. A connecting pipe 7 is installed through the low side wall of the treatment cylinder 5. The two ends of the connecting pipe 7 connect the internal cavity of the treatment cylinder 5 to the internal space of the ditch 1, which can balance the water level inside the cylinder and outside the ditch 1 in real time, avoiding problems such as negative pressure water accumulation inside the cylinder, slow water flow, and purification failure caused by excessive water level difference, and ensuring stable hydraulic conditions.

[0026] The treatment cylinder 5 integrates a two-stage water treatment mechanism, including a first water treatment module that can be pulled out and removed from the top, and a second water treatment module that is fixedly installed in the lower part of the cylinder. The second water treatment module is located directly below the first water treatment module, realizing the graded and progressive purification of the effluent from top to bottom.

[0027] The first water treatment module is a detachable pre-filtration dynamic anti-clogging component, including a cylindrical filter element 12 that matches the inner diameter of the treatment cylinder 5. The bottom of the filter element 12 has evenly distributed array-type filter holes 13 for intercepting silt and fine suspended particles. A surrounding limiting plate 14 and a bottom annular support plate 15 are fixed to the inner wall of the treatment cylinder 5. The filter element 12 is supported and placed on the support plate 15. The inner side wall of the limiting plate 14 is tightly fitted and flush with the outer side wall of the filter element 12, achieving precise positioning, preventing displacement, and preventing leakage of the filter element 12. A stepped groove 16 is provided at the top of the treatment cylinder 5. A perforated cover plate 17 is embedded in the stepped groove 16 for top protection and ventilation / water passage. Multiple evenly distributed vertical connecting rods 18 are fixed to the inner bottom surface of the perforated cover plate 17. The lower ends of the connecting rods 18 are uniformly fixed to the top of the filter element 12, enabling the cover plate and filter element 12 to be disassembled and reassembled together. The filter element 12 can be easily removed by opening the cover plate, facilitating maintenance, cleaning, and replacement.

[0028] Two waterproof protective covers 19 are symmetrically arranged and centrally fixed inside the filter element 12. High-precision sealed bearings 20 (model 6200ZZ waterproof sealed bearings) are nested inside the waterproof protective covers 19. A rotating shaft 21 is coaxially mounted between the two sets of symmetrical bearings 20. Multiple inclined spiral blades 22 are fixed to the outer wall of the rotating shaft 21, with all spiral blades 22 facing directly towards the area below the outlet of the through-channel 6. When the tailwater flows in at high speed through the through-channel 6, it impacts the spiral blades 22, driving the rotating shaft 21 to rotate autonomously, achieving dynamic disturbance of the water flow and effectively preventing sediment accumulation and clogging of the filter holes 13, thus achieving an autonomous anti-clogging function.

[0029] The second water treatment module is a wetland water purification module, which adopts a three-layer composite biological purification packing layer structure. The entire module is mounted on a support frame 26 fixed inside the treatment cylinder 5. The support frame 26 is a hollow, corrosion-resistant stainless steel frame with strong load-bearing capacity and good water permeability. The lower layer is a coarse-grained volcanic rock support layer 23 with a particle size of 20-30mm, which provides support, water permeability, and preliminary adsorption of impurities. The middle layer is a three-dimensional elastic biological packing 24, which is enriched with native pollution-resistant microbial communities. The upper layer is a wetland aquatic plant planting layer 25, which is planted with pollution-resistant and easy-to-grow native wetland plants such as calamus, pickerelweed, and reeds. Relying on the composite wetland purification mode of "physical adsorption + microbial degradation + plant absorption", it deeply removes ammonia nitrogen, total phosphorus, and organic pollutants from the effluent, achieving the standard purification of farmland 2 effluent.

[0030] The device is equipped with an intelligent electrical control monitoring and early warning system. A waterproof and dustproof control box is fixed to the side wall of the field ridge. The control box integrates the main control chip, power supply module, and signal processing circuit. The main control chip is an STM32F103C8T6 industrial-grade microcontroller; the power supply module is an MPPT-20A solar charge and discharge controller; and the solar power supply component is an 18V / 30W monocrystalline silicon waterproof solar photovoltaic panel, which is deployed in an unobstructed area of ​​the field to achieve all-weather self-sufficiency in power supply without the need for external mains power.

[0031] The water quality monitoring sensor module 28 uses a TS-600 multi-parameter water quality sensor, integrating ammonia nitrogen, total phosphorus, and suspended solids detection functions. It is waterproof and explosion-proof, installed on the inner wall of the treatment cylinder 5 near the connecting pipe 7, and collects real-time water quality data after purification, transmitting it to the main control chip. The laser beam switch 27 uses an E3Z-LS63 infrared laser beam sensor, installed in pairs on the upper and lower corresponding positions of the inner wall of the filter element 12. It is used to monitor the thickness of sediment buildup inside the filter element 12 in real time. When sediment accumulation obstructs the laser beam path, it indicates excessive blockage. The alarm light is a DC12V waterproof audible and visual alarm light, electrically connected to the main control chip and the laser beam switch 27. It automatically triggers an audible and visual alarm when blockage exceeds the standard or water quality is abnormal, reminding maintenance personnel to promptly inspect and clean the filter.

[0032] The overall operation of this device is as follows: the tailwater from farmland 2 is guided through the tailwater channel 3 and the guide plate 4 into the treatment cylinder 5 and the through channel 6. The comb teeth 11 intercept large debris, and the water flow impacts the spiral blades 22 to achieve autonomous rotation and prevent clogging. The tailwater is then filtered by the filter element 12 of the first water treatment module to complete the pre-filtration of sediment. The filtered water falls into the second water treatment module, where it undergoes deep denitrification, phosphorus removal, and organic matter degradation and purification through a three-layer composite wetland packing. The connecting pipe 7 balances the internal and external water levels in real time to ensure stable water flow. The water quality sensor monitors the effluent water quality in real time, and the laser beam switch 27 monitors the filter element clogging status in real time. An alarm is automatically triggered in case of abnormality. Finally, the purified water that meets the standards flows into the field ditch 1 and can be directly used for irrigation and reuse in farmland 2.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A farmland water utilization wetland water purification treatment device, installed inside a ditch (1) between farmland (2), wherein the farmland (2) and the ditch (1) are connected by a tailwater guiding channel (3) set on the side of the farmland (2), the tailwater guiding channel (3) being set on the field ridge, characterized in that, The system includes a guide plate (4) placed inside the tailwater channel (3). A treatment cylinder (5) is fixed at the end of the guide plate (4) away from the tailwater channel (3). A through groove (6) is provided on the side of the treatment cylinder (5). The through groove (6) is connected to the guide plate (4). The through groove (6) is set off from the axis of the treatment cylinder (5). A secondary water treatment mechanism is provided inside the treatment cylinder (5). The bottom of the treatment cylinder (5) is in contact with the bottom of the ditch (1). A connecting pipe (7) is provided on the side of the treatment cylinder (5). The connecting pipe (7) is used to balance the water level inside the treatment cylinder (5) and inside the ditch (1). The secondary water treatment mechanism includes a first water treatment module that can be taken out along the top of the treatment cylinder (5) and a second water treatment module fixed inside the treatment cylinder (5). The second water treatment module is a wetland water purification mode and is located below the first water treatment module.

2. The farmland (2) water utilization wetland water quality purification and treatment device according to claim 1, characterized in that, The sides of both the field ridges and the ditch (1) are provided with fixing grooves (8).

3. The farmland (2) water utilization wetland water quality purification and treatment device according to claim 2, characterized in that, The processing cylinder (5) is bolted to both sides with connecting plates (9). A horizontal plate (10) is welded to the end of the connecting plate (9) away from the processing cylinder (5). The horizontal plate (10) is inserted into the fixed groove (8). The space between the horizontal plate (10) and the bottom of the fixed groove (8) is filled with concrete.

4. The farmland (2) water utilization wetland water quality purification and treatment device according to claim 1, characterized in that, The through groove (6) is fixed with comb teeth (11), and the comb teeth (11) are arranged at equal intervals along the arc-shaped bending direction of the through groove (6).

5. The farmland (2) water utilization wetland water purification and treatment device according to claim 1, characterized in that, The first water treatment module includes a filter element (12) placed inside the treatment cylinder (5). The bottom of the filter element (12) is provided with a plurality of filter holes (13). A limiting plate (14) and a support plate (15) fixed on the inner wall of the treatment cylinder (5) are provided on the side of the filter element (12). The bottom of the filter element (12) is placed on the surface of the support plate (15). The surface of the limiting plate (14) is flush with the surface of the filter element (12). The limiting plate (14) wraps around the outer periphery of the filter element (12).

6. The farmland (2) water utilization wetland water quality purification and treatment device according to claim 5, characterized in that, The top of the processing cylinder (5) is provided with a stepped groove (16), and a perforated cover plate (17) is placed inside the stepped groove (16). A connecting rod (18) is fixed on the side of the perforated cover plate (17) facing the inside of the processing cylinder (5). Several connecting rods (18) are provided along the circumference of the perforated cover plate (17), and the other end of several connecting rods (18) is fixed to the top of the filter element (12).

7. The farmland (2) water utilization wetland water purification and treatment device according to claim 6, characterized in that, The filter element (12) is also fixed with a waterproof protective cover (19). The waterproof protective cover (19) is provided with a bearing (20). There are two waterproof protective covers (19). The two waterproof protective covers (19) are symmetrically arranged. The waterproof protective cover (19) away from the filter element (12) is fixed between all the connecting rods (18). A rotating shaft (21) is installed between the two opposing bearings (20). Several spiral blades (22) are fixed on the side of the rotating shaft (21). The spiral blades (22) are inclined. All the spiral blades (22) are located below the through groove (6).

8. The farmland (2) water utilization wetland water purification and treatment device according to claim 1, characterized in that, The second water treatment module includes a composite biological purification packing material, which has a three-layer structure. The lower layer is a coarse-grained volcanic rock support layer (23), the middle layer is a three-dimensional elastic biological packing material (24), and the upper layer is a wetland aquatic plant planting layer (25). A support frame (26) is provided at the bottom of the composite biological purification packing material, and the coarse-grained volcanic rock support layer (23) is placed on the support frame (26).

9. The farmland (2) water utilization wetland water quality purification and treatment device according to claim 5, characterized in that, It also includes a control box installed on the ditch (1) or field ridge. The control box integrates a main control chip. The main control chip is electrically connected to a power supply module. The power supply module is electrically connected to a solar power supply component. The main control chip is also electrically connected to a water quality monitoring sensor module (28) and a laser beam switch (27). The laser beam switch (27) is electrically connected to an alarm light. The alarm light is powered by the power supply module. The water quality monitoring sensor is installed on the inner wall of the treatment cylinder (5) and is located near the connecting pipe (7). The laser beam switch (27) is installed on the inner wall of the filter element (12) to monitor the thickness of the soil accumulated inside the filter element (12).

Images