Farmland ecological water network purification system

Abstract

The utility model discloses a farmland ecological water net purification system which comprises a wetland net, a plurality of farmlands, a plurality of cutoff wells, a front pond and a pump body, and the wetland net comprises a plurality of transverse wetlands and a plurality of longitudinal wetlands; the plurality of farmlands are arranged in a plurality of areas defined by the plurality of transverse wetlands and the plurality of longitudinal wetlands in a one-to-one correspondence manner, and each farmland is higher than the transverse wetlands and the longitudinal wetlands on the peripheral side of the farmland; the plurality of seepage intercepting wells are arranged at the crossed positions of the plurality of transverse wetlands and the plurality of longitudinal wetlands in a one-to-one correspondence manner, and each seepage intercepting well is lower than the transverse wetland and the longitudinal wetland on the peripheral side of the seepage intercepting well; the front pond is arranged beside the wetland net, the front pond is lower than the wetland net, and the front pond is connected with the transverse wetland and / or the longitudinal wetland; and the pump body is arranged in the front pond. The purification system disclosed by the utility model can be used for ecologically coupling a farmland, a pit pond, a wetland and the like, effectively solving the influence of non-point source pollution on a water environment, and simultaneously increasing and decreasing the flood drainage and water storage drought resistance capabilities of the farmland.

Description

Technical Field

[0001] The utility model relates to the technical field of ecological management, and in particular to a farmland ecological water network purification system. Background Art

[0002] The flat plains are important grain producing areas in my country. There are a large number of ponds and ditches scattered around the plain rural areas, which play a role in flood control, water storage and drought resistance, and environmental beautification. However, in the agricultural planting process, due to the large amount of irregular use of pesticides and fertilizers, residual nitrogen, phosphorus and other substances will enter the ponds or ditches near the villages through farmland drainage and surface runoff, making it easy for the plains to form non-point source pollution, which brings serious harm to the rural water environment.

[0003] However, the overall ecological coupling of farmlands, ponds, etc. in the existing technology is poor, and it is impossible to effectively purify the above-mentioned non-point source pollution, which also makes the overall drainage, water storage and drought resistance of farmland poor. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the embodiment of the utility model proposes a farmland ecological water network purification system, which can ecologically couple farmland, ponds, wetlands, etc., effectively solve the impact of non-point source pollution on the water environment, and at the same time increase or decrease the drainage and water storage and drought resistance capabilities of farmland.

[0006] The farmland ecological water network purification system of the utility model embodiment includes:

[0007] A wetland network, the wetland network comprising a plurality of transverse wetlands and a plurality of longitudinal wetlands arranged in a horizontal and vertical staggered manner;

[0008] A plurality of farmlands, wherein the plurality of farmlands are arranged one by one in a plurality of areas surrounded by the plurality of transverse wetlands and the plurality of longitudinal wetlands, and each of the farmlands is higher than the transverse wetlands and the longitudinal wetlands surrounding it;

[0009] A plurality of interception wells, the plurality of interception wells being arranged one by one at the intersection of the plurality of transverse wetlands and the plurality of longitudinal wetlands, each of the interception wells being lower than the transverse wetlands and the longitudinal wetlands on its surrounding sides so that a circulating waterfall can be formed between the interception well and the wetland network;

[0010] A front pond, which is arranged beside the wetland network, is lower than the wetland network, and is connected to the transverse wetland and / or the longitudinal wetland so that water in the wetland network can flow into the front pond by itself;

[0011] A pump body is arranged in the front pond, and the pump body is used to pump water in the front pond to the farmland, the wetland network or the adjacent water body.

[0012] In some embodiments, a plurality of the longitudinal wetlands are arranged at intervals along the first direction and extend along the second direction, a plurality of the transverse wetlands extend along the second direction and are arranged at intervals in the first direction, each of the longitudinal wetlands is arranged inclined downward along the second direction, and the front pond is located at the bottom of the slope connected to the longitudinal wetlands.

[0013] In some embodiments, the heights of the plurality of transverse wetlands tend to decrease along an inclined direction from the longitudinal wetland.

[0014] In some embodiments, the multiple longitudinal wetlands include a middle longitudinal wetland located in the middle in the first direction, the heights of the multiple longitudinal wetlands on one side of the middle longitudinal wetland gradually decrease in the direction away from the middle longitudinal wetland, and the heights of the multiple longitudinal wetlands on the other side of the middle longitudinal wetland gradually decrease in the direction away from the middle longitudinal wetland.

[0015] In some embodiments, there are multiple front ponds, and the multiple front ponds are connected to at least part of the longitudinal wetlands in a one-to-one correspondence. The pump body is arranged at the front pond with the largest area among the multiple front ponds.

[0016] In some embodiments, the intercepting well is filled with gravel and filler, and the four sides of the intercepting well are connected with the transverse wetland or the longitudinal wetland through gravel.

[0017] In some embodiments, the transverse wetland and the longitudinal wetland are horizontal subsurface flow wetlands or vertical subsurface flow wetlands.

[0018] In some embodiments, bacterial agents for denitrification and phosphorus removal are buried in the interception wells and the wetland network, and / or electrodes are placed in the longitudinal wetland and the transverse wetland.

[0019] In some embodiments, an overflow weir is included, and the front pond is connected to the river water body through the overflow weir, and the overflow weir is used to adjust the water level height of the water body in the front pond.

[0020] In some embodiments, a control device is included, and a detection instrument is arranged in the front pond. The detection instrument is used to detect water quality and water level. The detection instrument, pump body, and gate of the overflow weir are all electrically connected to the control device.

[0021] Beneficial effects: The farmland ecological water network purification system of the embodiment of the utility model can ecologically couple farmland, ponds, wetlands, etc., effectively solve the impact of non-point source pollution on the water environment, and at the same time increase or decrease the drainage and water storage and drought resistance capabilities of farmland. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the farmland ecological water network purification system of the embodiment of the utility model.

[0023] Reference numerals:

[0024] Wetland network 1; horizontal wetland 11; longitudinal wetland 12; intermediate longitudinal wetland 121; farmland 2; interception well 3; front pond 4; pump body 5; river water body 6. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0026] like Figure 1 As shown, the farmland ecological water network purification system of the embodiment of the utility model includes a wetland network 1, multiple farmlands 2, multiple interception wells 3, a front pond 4 and a pump body 5.

[0027] The wetland network 1 includes a plurality of transverse wetlands 11 and a plurality of longitudinal wetlands 12 arranged in a staggered manner. Figure 1 As shown, the wetland network 1 may include four transverse wetlands 11 and three longitudinal wetlands 12, wherein the four transverse wetlands 11 may extend in the left-right direction and be arranged in parallel and spaced in the front-back direction, and the three longitudinal wetlands 12 may extend in the front-back direction and be arranged in parallel and spaced in the left-right direction. It should be noted that the transverse wetlands 11 and the longitudinal wetlands 12 may be regarded as Figure 1 Small wetlands in the area.

[0028] The plurality of farmlands 2 are arranged one by one in a plurality of areas surrounded by the plurality of transverse wetlands 11 and the plurality of longitudinal wetlands 12, and each farmland 2 is higher than the transverse wetlands 11 and the longitudinal wetlands 12 surrounding it. Figure 1 As shown, a plurality of transverse wetlands 11 and a plurality of longitudinal wetlands 12 form a grid-like structure and divide a plurality of rectangular areas, each of which can be arranged with a farmland 2. The elevation of each farmland 2 is higher than the elevation of the transverse wetlands 11 and longitudinal wetlands 12 surrounding the farmland 2, so that there is a height difference between the farmland 2 and each wetland.

[0029] Multiple interception wells 3 are arranged one by one at the intersection of multiple transverse wetlands 11 and multiple longitudinal wetlands 12. Each interception well 3 is lower than the transverse wetlands 11 and longitudinal wetlands 12 around it so that a circulating waterfall can be formed between the interception well 3 and the wetland network 1.

[0030] Specifically, the above four transverse wetlands 11 and three longitudinal wetlands 12 can form a total of 12 intersections, each of which can be arranged with an interception well 3, and some gravel and fillers can be filled in the interception well 3. The wellhead of each interception well 3 can be roughly flush with the corresponding transverse wetland 11 and longitudinal wetland 12, and the bottom of each interception well 3 is lower than the transverse wetland 11 and longitudinal wetland 12 around the interception well 3.

[0031] The front pond 4 is arranged beside the wetland network 1, the front pond 4 is lower than the wetland network 1, and the front pond 4 is connected to the horizontal wetland 11 and / or the vertical wetland 12 so that the water in the wetland network 1 can flow into the front pond 4 by itself. Figure 1 As shown, the front pond 4 can be arranged at the rear side of the wetland net 1, and the front pond 4 is lower than the wetland net 1 as a whole. The front pond 4 has the effect of storing and purifying water.

[0032] The pump body 5 is arranged in the front pond 4, and the pump body 5 is used to pump the water in the front pond 4 to the farmland 2, the wetland network 1 or the adjacent water body.

[0033] For example, when the farmland 2 needs to be irrigated in the dry season, the pump body 5 can be used to pump the water in the front pond 4 to each farmland 2. Due to the elevation difference, the water will flow from each farmland 2 into the wetland network 1, and then into each interception well 3. When the interception well 3 reaches a certain amount, it will overflow to the corresponding horizontal wetland 11 and longitudinal wetland 12, so that a multi-stage cycle can be formed between the corresponding wetland and the interception well 3, which is conducive to improving the purification effect. The water in the wetland network 1 can be gathered in the front pond 4 under the action of gravity.

[0034] It should be noted that since there are height differences between the farmland 2 and the wetland network 1, between the wetland network 1 and the interception well 3, and between the wetland network 1 and the front pond 4, waterfalls can be formed at each height difference, thereby increasing the oxygenation capacity and purification effect of the ecological water network.

[0035] In some embodiments, multiple longitudinal wetlands 12 are arranged at intervals along the first direction and extend along the second direction, multiple transverse wetlands 11 extend along the second direction and are arranged at intervals in the first direction, each longitudinal wetland 12 is arranged inclined downward along the second direction, and the front pond 4 is located at the bottom end of the slope connected to the longitudinal wetland 12.

[0036] For example, Figure 1As shown, the first direction and the second direction can be arranged vertically, wherein the first direction can be the left-right direction, and the second direction can be the front-back direction, and each longitudinal wetland 12 and each transverse wetland 11 can be arranged vertically. Each longitudinal wetland 12 can have a certain slope, and each longitudinal wetland 12 can be arranged generally in a slanting downward direction from front to back. The front pond 4 can be arranged at the rear side of the wetland network 1 and connected to the rear end of each longitudinal wetland 12.

[0037] As a result, the water in the wetland network 1 can flow into the front pond 4 by itself under the action of gravity, ensuring the smooth operation of the purification system.

[0038] Optionally, the slope of the longitudinal wetland 12 may be 0-3‰.

[0039] In some embodiments, the heights of the plurality of transverse wetlands 11 tend to decrease along the inclination direction from the longitudinal wetland 12. Figure 1 As shown, in the direction from front to back, the elevations of multiple transverse wetlands 11 are gradually reduced, so that the transverse wetlands 11 can adapt to the layout requirements of the slope changes of the longitudinal wetlands 12, facilitating the convergence of water in the wetland network 1 from front to back.

[0040] In some embodiments, the multiple longitudinal wetlands 12 include a middle longitudinal wetland 121 located in the middle in the first direction, the heights of the multiple longitudinal wetlands 12 on one side of the middle longitudinal wetland 121 gradually decrease in the direction away from the middle longitudinal wetland 121, and the heights of the multiple longitudinal wetlands 12 on the other side of the middle longitudinal wetland 121 gradually decrease in the direction away from the middle longitudinal wetland 121.

[0041] For example, Figure 1 As shown, there can be three longitudinal wetlands 12, and the three longitudinal wetlands 12 can be arranged in parallel and spaced in the left and right directions, wherein the middle longitudinal wetland 121 is a longitudinal wetland 12 located in the middle position. The elevation of the longitudinal wetland 12 on the left side is lower than the elevation of the middle longitudinal wetland 121, and the elevation of the longitudinal wetland 12 on the right side is also lower than the elevation of the middle longitudinal wetland 121.

[0042] As a result, the water in the wetland net 1 can flow from the center to the left and right. Figure 1 As shown by the black arrow in the middle horizontal wetland 11, the water drainage capacity within the wetland network 1 can be improved.

[0043] In some embodiments, there are multiple front ponds 4, and the multiple front ponds 4 are connected to at least part of the longitudinal wetland 12 in a one-to-one correspondence. The pump body 5 is arranged at the front pond 4 with the largest area among the multiple front ponds 4.

[0044] For example, Figure 1As shown, the number of the front ponds 4 can be the same as the number of the longitudinal wetlands 12, and there can be three front ponds 4 and three longitudinal wetlands 12, and the three front ponds 4 can be connected to the rear ends of the three longitudinal wetlands 12 one by one. Thus, the water in the wetland network 1 can flow into the corresponding front ponds 4 through the corresponding longitudinal wetlands 12.

[0045] It should be noted that the pre-pond 4 located in the middle of the three pre-ponds 4 has the largest area, and the pump body 5 can be arranged in the middle pre-pond 4. In some other embodiments, at least one pump body 5 can also be arranged in each pre-pond 4.

[0046] In some embodiments, the periphery of the interception well 3 is connected to the transverse wetland 11 or the longitudinal wetland 12 through crushed stones. For example, crushed stones can be piled at the periphery of the interception well 3, and the crushed stones can be graded crushed stones, so as to stabilize the wellhead edge of the interception well 3 and effectively connect with the wetland.

[0047] In some embodiments, the transverse wetland 11 and the longitudinal wetland 12 are horizontal subsurface flow wetlands or vertical subsurface flow wetlands.

[0048] In some embodiments, bacterial agents for nitrogen and phosphorus removal are buried in the interception well 3 and the wetland network 1, and the bacterial agents have the characteristics of being resistant to severe cold, and electrodes are placed in the longitudinal wetland 12 and the transverse wetland 11. This can improve the purification efficiency of the wetland itself.

[0049] In some embodiments, the purification system includes an overflow weir, the front pond 4 is connected to the river water body 6 through the overflow weir, and the overflow weir is used to adjust the water level of the water body in the front pond 4. Figure 1 As shown, the canal water body 6 can be arranged at the rear side of the plurality of front ponds, and an overflow weir can be arranged between each front pond 4 and the canal water body 6, and the overflow weir is provided with a gate, and when in use, the water level in the corresponding front pond 4 can be adjusted in conjunction with the gate. The water in the canal water body 6 can also be introduced into the front pond 4 for purification, and then the purified water can be used for irrigation.

[0050] In some embodiments, a control device is included, and a detection instrument is arranged in the front pond 4. The detection instrument is used to detect water quality and water level. The detection instrument and the pump body 5 are electrically connected to the control device. The control device can play a role in overall controlling the operation of the water pump, etc., which is conducive to realizing the automation and intelligence of the purification system operation.

[0051] The following describes the method of using the embodiment of the utility model.

[0052] The method for using the farmland ecological water network purification system according to the embodiment of the utility model comprises the following steps:

[0053] According to different needs, it can be divided into dry season irrigation mode, rainy season drainage mode, purification mode and sunny day non-irrigation mode;

[0054] In the welding irrigation mode, the water in the front pond 4 is pumped to each farmland 2 through the pump body 5, and then under the action of gravity, the water flows through the wetland network 1 and the interception well 3 and then returns to the front pond 4;

[0055] In the rainy season drainage mode, rainwater in the farmland 2 flows into the front pond 4 through the wetland network 1 and the interception well 3. If the water level in the front pond 4 exceeds the set threshold, the water in the front pond 4 is discharged by overflow or by starting the pump 5.

[0056] In the purification mode, the water in the front pond 4 is pumped into the wetland network 1 by the pump body 5, and the water is purified by flowing through the wetland network 1 and the interception well 3;

[0057] In the non-irrigation mode on sunny days, the intermittent operation of the wetland network 1 is utilized to achieve oxygenation and purification of the system.

[0058] A specific example of the farmland ecological water network purification system according to an embodiment of the utility model is described below.

[0059] The entire system covers an area of ​​about 1,500 square meters, each farmland 2 is 300 square meters, and the bottom elevation difference is -0.2 meters. The width of the micro-wetland channel (which can be regarded as each longitudinal wetland 12 and each transverse wetland 11) is 1.0 meters, and the bottom elevation is ≤-0.5 meters. The ecological interception well 3 is 1.0*1.0 meters, and the bottom elevation is -1.5 meters. There are three front ponds 4, and the areas of the three front ponds 4 are 100 square meters, 150 square meters, and 100 square meters respectively, with a bottom elevation of ≤-2.0 meters, which can meet the needs of aquatic plant planting and watering irrigation.

[0060] The wetland network 1 formed by the micro-wetland channel has a certain slope from front to back and from the middle to the left and right sides, with a slope of 0-3‰. The micro-wetland can be a horizontal subsurface flow wetland or a vertical subsurface flow wetland. The present embodiment is a horizontal subsurface flow wetland. The vegetation can be a locally preferred vegetation with high purification efficiency, and the wetland filler can be a mainstream commonly used filler. In order to improve the effect of the wetland in winter operation, a cold-resistant denitrification and dephosphorization bacterial agent is buried at the bottom of the micro-wetland, and electrodes are placed at the same time to improve the purification efficiency of the wetland itself.

[0061] The ecological interception well 3 is located at the intersection of the small wetland channel. 5-20 cm gravel is laid in the well, and graded crushed stone is used around the well to connect with the wetland. The gap in the ecological interception well 3 is relatively large, which can intercept and store water and purify it. Denitrification and phosphorus removal bacteria can also be placed to increase biomass and improve water purification effect.

[0062] The front pond 4 is used to construct water ecology to purify the water. Figure 1An ecological water pump is set in the middle pre-pond to irrigate the farmland 2 through a hose. The pre-pond 4 is connected to the river water body 6 through an overflow weir, and the water level of the pre-pond 4 can be adjusted in conjunction with the gate. In actual application, river water can be introduced and purified, and then the purified water can be used for irrigation.

[0063] Water quality and water level detection instruments are installed in the front pond 4, combined with the artificial intelligence system to control the operation of the gate and water pump. In this way, the entire farmland 2 ecological water network becomes a dynamic circulation water purification system, purifying river water and reducing agricultural non-point source pollution.

[0064] When the dry season irrigation purification process is started, the water in the front pond 4 is led to the farmland 2 through the ecological water pump (which can be regarded as the above-mentioned pump body 5), and the excess water in the farmland 2 overflows into the small wetland for purification. Due to the height difference between the farmland 2 and the small wetland, a waterfall will be formed during the overflow, thereby increasing the oxygenation capacity of the ecological water network. The ecological seepage well 3 set at the intersection of the small wetland channel is filled with gravel and fillers, so that a waterfall can be formed, and a part of the water can be collected and purified. When the water is full, the water in the ecological seepage well 3 overflows into the small wetland again, and the multi-stage cycle is repeated, and then the water is oxygenated by the waterfall and enters the front pond 4 for further purification, thereby reducing pollutants such as nitrogen and phosphorus in the water body and reducing the impact of agricultural non-point source pollution on the water environment.

[0065] When the rainy season drainage, water storage and purification process is started, the excess rainwater in the farmland 2 enters the small micro wetland through the height difference and the waterfall, then enters the ecological infiltration well 3, and then flows into the next small micro wetland, so that it can be repeatedly collected in multiple stages, infiltrated and intercepted, and the water storage buffer capacity of the system can be increased. Finally, it is oxygenated by the waterfall and flows into the front pond 4 for further purification. When the water level in the front pond 4 is high, the overflow waterfall can enter the nearby water body, and when encountering heavy rainfall, the rainwater can be discharged through the ecological water pump of the front pond 4, which enhances the drainage and water storage capacity of the ecological water network purification system.

[0066] When the purification mode is started, the water in the front pond 4 is led to the small wetland for purification through the ecological water pump, and then the water will flow into the interception well 3, and a part of the water can be collected and purified through the interception well 3. The water in the ecological interception well 3 will then overflow into the small wetland, and the multi-stage cycle will be repeated. Then, the water will be oxygenated by the waterfall and enter the front pond 4 for further purification, thereby reducing pollutants such as nitrogen and phosphorus in the water body and reducing the impact of agricultural non-point source pollution on the water environment.

[0067] When there is no irrigation on sunny days, the entire ecological water network purification system is at rest, and the small wetlands can be operated intermittently. The system's oxygenation capacity and purification efficiency are improved, extending the life of the entire ecological water network purification system.

[0068] The present disclosure has the following beneficial effects:

[0069] The ecological water network purification system disclosed in the present invention ecologically couples farmland 2, small wetlands, ecological interception wells 3, and front ponds 4 with crop irrigation, which can effectively solve the impact of non-point source pollution on the water environment.

[0070] The ecological water network purification system disclosed in the present invention connects the farmland 2, small wetlands, ecological seepage interception wells 3 and front ponds 4, forming countless ecological sponges during the rainy season, which can not only purify the water body, but also improve the drainage, water storage and drought resistance capabilities of the farmland 2.

[0071] The ecological water network purification system disclosed in the present invention is combined with a modern artificial intelligence system to achieve automatic control, reduce energy consumption, and save labor costs.

[0072] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0073] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0074] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0076] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A farmland ecological water network purification system, characterized in that: include: A wetland network, the wetland network comprising a plurality of transverse wetlands and a plurality of longitudinal wetlands arranged in a horizontal and vertical staggered manner; A plurality of farmlands, wherein the plurality of farmlands are arranged one by one in a plurality of areas surrounded by the plurality of transverse wetlands and the plurality of longitudinal wetlands, and each of the farmlands is higher than the transverse wetlands and the longitudinal wetlands surrounding it; A plurality of interception wells, the plurality of interception wells being arranged one by one at the intersection of the plurality of transverse wetlands and the plurality of longitudinal wetlands, each of the interception wells being lower than the transverse wetlands and the longitudinal wetlands on its surrounding sides so that a circulating waterfall can be formed between the interception well and the wetland network; A front pond, which is arranged beside the wetland network, is lower than the wetland network, and is connected to the transverse wetland and / or the longitudinal wetland so that water in the wetland network can flow into the front pond by itself; A pump body is arranged in the front pond, and the pump body is used to pump water in the front pond to the farmland, the wetland network or the adjacent water body.

2. The farmland ecological water network purification system according to claim 1 is characterized in that: The plurality of longitudinal wetlands are arranged at intervals along the first direction and extend along the second direction, the plurality of transverse wetlands extend along the second direction and are arranged at intervals in the first direction, each of the longitudinal wetlands is arranged inclined downward along the second direction, and the front pond is arranged at the bottom of the slope connected to the longitudinal wetlands.

3. The farmland ecological water network purification system according to claim 2 is characterized in that: The heights of the plurality of transverse wetlands tend to decrease along an inclined direction from the longitudinal wetland.

4. The farmland ecological water network purification system according to claim 2 is characterized in that: The multiple longitudinal wetlands include a middle longitudinal wetland located in the middle in the first direction, the heights of the multiple longitudinal wetlands on one side of the middle longitudinal wetland gradually decrease in the direction away from the middle longitudinal wetland, and the heights of the multiple longitudinal wetlands on the other side of the middle longitudinal wetland gradually decrease in the direction away from the middle longitudinal wetland.

5. The farmland ecological water network purification system according to claim 2 is characterized in that: There are multiple front ponds, and the multiple front ponds are connected to at least part of the longitudinal wetlands in a one-to-one correspondence. The pump body is arranged at the front pond with the largest area among the multiple front ponds.

6. The farmland ecological water network purification system according to claim 1, characterized in that: The intercepting well is filled with gravel and filler, and the periphery of the intercepting well is connected with the transverse wetland or the longitudinal wetland through gravel.

7. The farmland ecological water network purification system according to claim 1, characterized in that: The transverse wetland and the longitudinal wetland are horizontal subsurface flow wetlands or vertical subsurface flow wetlands.

8. The farmland ecological water network purification system according to claim 1 is characterized in that: Bacterial agents for denitrification and dephosphorization are buried in the interception wells and the wetland network, and / or electrodes are placed in the longitudinal wetland and the transverse wetland.

9. The farmland ecological water network purification system according to any one of claims 1 to 8, characterized in that: It includes an overflow weir, the front pond is connected to the river water body through the overflow weir, and the overflow weir is used to adjust the water level height of the water body in the front pond.

10. The farmland ecological water network purification system according to claim 9, characterized in that: It comprises a control device. A detection instrument is arranged in the front pond. The detection instrument is used to detect water quality and water level. The detection instrument, the pump body and the gate of the overflow weir are all electrically connected to the control device.

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