A biological treatment device for agricultural non-point source pollution and a treatment method thereof

Abstract

The present invention provides a biological treatment device for agricultural non-point source pollution and a treatment method thereof, which solves the problem of how to purify farmland drainage polluted by agricultural non-point source pollution before it flows into lakes and rivers. When the present invention is used, the first filter screen first filters out large particles of debris entering the waterway entrance. Then, the activated carbon plate further filters the impurities in the water and guides the direction of the water flow so that the water flow after passing through the activated carbon plate can rush out in an inclined manner to the upper right to stir the water flow in the area where the first aquatic plant breeding frame is located. The newly inflowing water flow quickly replaces the water flow originally staying in the area where the first aquatic plant breeding frame is located, thereby enhancing the absorption efficiency of the aquatic plants planted in the aquatic plant breeding frame of eutrophic substances in the water. When the water flow in the ditch is slow and the amount is small, the gate plate can accumulate water flow to meet the growth needs of the aquatic plants in the aquatic plant breeding frame.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental pollution control, in particular to a biological control device for agricultural non-point source pollution and a control method thereof. Background Art

[0002] Rural non-point source pollution refers to the pollution caused by dissolved or solid pollutants in rural life and agricultural production activities, such as soil particles, nitrogen, phosphorus, heavy metals in pesticides, rural poultry and livestock manure, domestic garbage and other organic or inorganic substances, which enter the receiving water bodies (rivers, lakes, reservoirs, bays) from non-specific areas through surface runoff from farmland, farmland drainage and underground seepage under the action of precipitation and runoff.

[0003] Currently, agricultural non-point source pollution accounts for 60% to 80% of eutrophication in rivers and lakes, becoming a major constraint on the sustainable development of rural areas and agriculture. Reducing agricultural non-point source pollution by purifying farmland drainage before it enters lakes and rivers is an urgent issue that needs to be addressed. Summary of the Invention

[0004] In order to solve the problem in the background art of how to purify farmland drainage polluted by agricultural non-point source pollution before it flows into lakes and rivers, the present invention proposes a biological treatment device and treatment method for agricultural non-point source pollution.

[0005] The technical solution of the present invention is: a biological treatment device for agricultural non-point source pollution, comprising two side plates spaced apart from each other, the lower ends of the side plates being driven into and fixed in the bottom of a ditch, and a waterway for water flow to pass through being formed between the two side plates;

[0006] A first filter screen extending in the up-down direction is fixedly connected to the left side of the two side plates, and the lower end of the first filter screen abuts against the bottom of the ditch bottom. The first filter screen is used to filter large particles of debris from the waterway inlet;

[0007] A plurality of activated carbon plates are fixedly connected between the two side plates and arranged at intervals up and down. The activated carbon plates are arranged tilted from left to right and from bottom to top.

[0008] On the right side of the side plate are multiple gate plates spaced apart from each other. Overflow channels are provided on the gate plates for water to flow through. The overflow channels are transparent structures on the left and right sides.

[0009] Aquatic plant cultivation frames are provided between the side plates and the gate plates, and between two adjacent gate plates. The aquatic plant cultivation frames are upper-opening mesh frames made of permeable mesh. Floating blocks are fixed to the bottoms of the left and right sides of the aquatic plant cultivation frames. The density of the floating blocks is less than that of water, and the floating blocks are used to make the aquatic plant cultivation frames float on the water surface.

[0010] The aquatic plant breeding frame is used to breed aquatic plants that can control eutrophication of water bodies.

[0011] Preferably, the gate plate includes an isosceles trapezoidal plate section and an insert plate section, the insert plate section is fixed at the bottom of the isosceles trapezoidal plate section, the insert plate section is used to be inserted and fixed at the bottom of the ditch area, the oblique side of the isosceles trapezoidal plate section rests on the slope of the ditch, and the isosceles trapezoidal plate section is provided with a plurality of overflow grooves spaced apart up and down.

[0012] Preferably, a first slide rail extending in an up-down direction is fixedly provided on the left side of the first filter screen, and a first slider capable of sliding up and down is provided on the first slide rail;

[0013] A salvage net is fixedly provided on the left side of the first slider. The salvage net includes a vertically arranged vertical permeable net. The right side of the vertical permeable net is fixedly connected to the first slider. A storage net is fixedly provided on the left bottom of the vertical permeable net. The storage net has a right-angled trapezoidal structure with a large bottom and a small top. A storage cavity for filtering out and storing large particles of debris is formed between the storage net and the vertical permeable net.

[0014] The vertical permeable net and the storage net are both made of permeable net;

[0015] The bottom of the storage net rests on the bottom of the ditch, the top of the vertical permeable net extends to above the ground at both sides of the ditch, and a hanging ring is fixed on the top of the vertical permeable net.

[0016] Preferably, a bracket is fixedly provided on the side panel, and a fixed pulley mechanism and a manual winch are fixedly provided on the bracket;

[0017] The fixed pulley mechanism includes a pulley bracket and a fixed pulley rotatably arranged on the pulley bracket, and the fixed pulley is located on the left side of the manual winch;

[0018] A lifting rope is fixedly wound around the manual winch, and one end of the lifting rope is passed around a fixed pulley from the bottom and is fixedly connected with a lifting ring.

[0019] Preferably, the aquatic plant cultivation frame includes two connecting plates spaced apart from each other, and the floating blocks are fixed on the bottom of the connecting plates;

[0020] A breeding frame body is fixed between the left and right connecting plates. The breeding frame body is an isosceles trapezoidal plate structure that is larger at the top and smaller at the bottom and open at the top. Vertically arranged side mesh panels are fixed on the front and rear sides of the breeding frame body.

[0021] The main body of the breeding frame and the side net panels are made of permeable nets;

[0022] The tops of the connecting plate, the breeding frame body and the side mesh plates are flush with each other, and an aquatic plant breeding area is enclosed between the breeding frame body and the side mesh plates. The aquatic plant breeding area is used to breed aquatic plants that can control eutrophication of water bodies.

[0023] Preferably, a plurality of partitioning mesh panels are fixedly provided on the top of the bottom plate of the breeding frame body at intervals on the left and right, and the partitioning mesh panels extend in the front-to-back direction. The front and rear ends of the partitioning mesh panels are fixedly connected to the adjacent side mesh panels, and the top of the partitioning mesh panels is flush with the top of the connecting plate.

[0024] Preferably, the partitioning mesh is made of a permeable mesh.

[0025] Preferably, a slide rail extending in the up-down direction is provided on the right side of the side plate and on the left and right sides of the gate plate, and an adapted slider is slidably provided on the slide rail;

[0026] The left and right outer ends of the connecting plate on the aquatic plant cultivation frame are respectively fixedly connected to the adjacent sliding blocks.

[0027] A method for using a biological treatment device for agricultural non-point source pollution comprises the following steps:

[0028] S1~ Install two side plates spaced apart at the outlet of the ditch into the river or lake, and drive the lower ends of the side plates into the bottom of the ditch to fix the side plates in the ditch.

[0029] S2~ Pour concrete or pile sand and gravel between the side plates and the ditch slope to block the gap between the side plates and the ditch slope, so that a water channel for water flow is formed between the two side plates;

[0030] S3~Install the first filter on the left side of the side panel;

[0031] S4~ Install the first slide rail, the first slider and the salvage net on the left side of the first filter screen;

[0032] S5~Install a bracket on the side panel, install a manual winch and a fixed pulley mechanism on the bracket, wind a lifting rope around the manual winch, and pass one end of the lifting rope around the fixed pulley from the bottom and then securely connect it to the lifting ring;

[0033] S6~On the right side of the side plate, multiple insert plate sections at the bottom of the gate plate are vertically driven into the bottom of the ditch at intervals in the left and right directions, and the oblique sides of the isosceles trapezoidal plate sections of the gate plate are placed against the side slope of the ditch;

[0034] S7~ Install an aquatic plant cultivation frame between the side plate and the gate plate, and between two adjacent gate plates, and fix the left and right outer ends of the connecting plate of the aquatic plant cultivation frame to the adjacent sliding members respectively;

[0035] S8~ Planting aquatic plants capable of controlling eutrophication of the water body on the water surface of the aquatic plant breeding area according to the division of the internal space of the aquatic plant breeding frame by the dividing mesh plate;

[0036] S9~The salvage net is regularly pulled out of the water using a manual winch to clean up the large particles of debris in the storage cavity and attached to the vertical permeable net and storage net.

[0037] Advantages of the present invention: During use, the first filter screen first filters large particles of debris entering the waterway entrance. The activated carbon plate then further filters impurities from the water and directs the water flow, causing the water flowing through the activated carbon plate to flow out in an upward, rightward direction, thereby agitating the water flow in the area where the first aquatic plant cultivation frame is located. The newly inflowing water quickly replaces the water flow originally remaining in the area where the first aquatic plant cultivation frame is located, thereby enhancing the efficiency of the aquatic plants planted in the aquatic plant cultivation frame in absorbing eutrophic substances in the water.

[0038] When the water flow in the ditch is slow and small, the gate can store water to meet the growth needs of aquatic plants in the aquatic plant breeding frame.

[0039] When the rainfall is heavy and rapid, the water flow in the ditch increases, and the water flow speed accelerates. The aquatic plant cultivation frame automatically floats up as the water surface rises, and the water automatically flows out through the overflow chute.

[0040] Planting aquatic plants in an aquatic plant cultivation frame makes it easier to collect and replace the aquatic plants later. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 This is a schematic diagram of the main structure of Example 1;

[0043] Figure 2 for Figure 1 A schematic diagram of the structure of the side panels and the accessories thereon;

[0044] Figure 3 for Figure 1 Schematic diagram of the structure of the salvage net;

[0045] Figure 4 for Figure 1 The structure diagram of the gate;

[0046] Figure 5 for Figure 4 Schematic diagram of the structure of the middle gate from the left angle;

[0047] Figure 6 for Figure 1 Schematic diagram of the structure of the aquatic plant cultivation frame;

[0048] Figure 7 for Figure 6 A schematic diagram of the structure of the aquatic plant cultivation frame from a top view;

[0049] In the figure, 1. ditch bottom, 2. side panel, 3. first filter screen, 4. first slide rail, 5. first slider, 6. salvage net, 601. vertical permeable net, 602. storage net, 603. storage chamber, 604. lifting ring, 7. bracket, 8. manual winch, 9. fixed pulley mechanism, 10. activated carbon plate, 11. second slide rail, 12. second slider, 13. gate plate, 14. overflow chute, 15. third slide rail, 16. third slider, 17. fourth slide rail, 18. fourth slider, 19. aquatic plant cultivation frame, 20. connecting plate, 21. cultivation frame body, 22. dividing mesh plate, 23. side mesh plate, 24. floating block. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0051] Example 1: A biological treatment device for agricultural non-point source pollution, such as Figure 1 As shown (in order to facilitate the display of the structure between the two side panels 1, Figure 1 The side panel 2 on the left is hidden in the figure), including two side panels 2 spaced apart in front and back, the lower ends of the side panels 2 are driven into and fixed in the bottom 1 of the ditch, and a waterway for water flow is formed between the two side panels 2.

[0052] like Figure 2 As shown, the left side of the two side panels 2 is fixedly connected with a first filter screen 3 extending in the up and down direction, and the lower end of the first filter screen 3 is against the bottom of the ditch bottom 1. The first filter screen 3 is used to filter large particles of debris from the waterway inlet.

[0053] A first slide rail 4 extending in an up-down direction is fixedly provided on the left side of the first filter screen 3 , and a first sliding block 5 capable of sliding up and down is provided on the first slide rail 4 .

[0054] A salvage net 6 is fixedly provided on the left side of the first slider 5. Figure 3 As shown, the salvage net 6 includes a vertically arranged vertical permeable net 601, the right side of the vertical permeable net 601 is fixedly connected to the first slider 5, and a storage net 602 is fixedly provided at the bottom of the left side of the vertical permeable net 601. The storage net 602 has a right-angled trapezoidal structure with a larger upper part and a smaller lower part and an upper opening. A storage cavity 603 for filtering out and storing large particles of debris is formed between the storage net 602 and the vertical permeable net 601.

[0055] The vertical permeable net 601 and the storage net 602 are both made of permeable nets.

[0056] The bottom of the storage net 602 rests on the ditch bottom 1 , and the top of the vertical permeable net 601 extends above the ground at the front and rear sides of the ditch. A hanging ring 604 is fixed to the top of the vertical permeable net 601 .

[0057] A bracket 7 is fixedly provided on the side panel 2 , and a fixed pulley mechanism 9 and a manual winch 8 are fixedly provided on the bracket 7 .

[0058] The fixed pulley mechanism 9 includes a pulley bracket and a fixed pulley rotatably arranged on the pulley bracket, and the fixed pulley is located on the left side of the manual winch 8.

[0059] A lifting rope is fixedly wound around the manual winch 8 , and one end of the lifting rope is fixedly connected to the lifting ring 604 after passing through the fixed pulley from the bottom.

[0060] A plurality of activated carbon plates 10 are fixedly connected between the two side plates 2 and spaced apart from each other. The activated carbon plates 10 are arranged obliquely from left to right and from bottom to top.

[0061] The functions of the activated carbon plate 10 are: first, to further filter impurities in the water; second, to guide the direction of the water flow so that the water flow after passing through the activated carbon plate 10 can rush out to the upper right to stir the water flow in the area where the first aquatic plant breeding frame 19 is located. The newly flowing water flow quickly replaces the water flow originally staying in the area where the first aquatic plant breeding frame 19 is located, thereby enhancing the absorption efficiency of the aquatic plants planted in the aquatic plant breeding frame 19 for eutrophic substances in the water.

[0062] like Figure 1 As shown, a plurality of gate plates 13 are provided on the right side of the side plate 2 and spaced apart from each other. In this embodiment, the number of gate plates 13 is set to three, as shown in FIG. Figure 4 and Figure 5 As shown, the gate plate 13 includes an isosceles trapezoidal plate section and an inserting plate section. The inserting plate section is fixed at the bottom of the isosceles trapezoidal plate section. The inserting plate section is used to be inserted and fixed at the bottom 1 of the ditch. The hypotenuse of the isosceles trapezoidal plate section rests on the slope of the ditch. The isosceles trapezoidal plate section is provided with a plurality of overflow grooves 14 spaced apart from each other.

[0063] Aquatic plant cultivation frames 19 are installed between the side panels 2 and the gate panels 13, and between two adjacent gate panels 13. These frames 19 are top-opening, made of a permeable mesh. Floating blocks 24 are fixed to the bottoms of the left and right sides of the frames 19. The density of the floating blocks 24 is less than that of water, and they are used to keep the frames 19 afloat. Aquatic plants that can control eutrophication are cultivated within the frames 19.

[0064] Specifically, such as Figure 6 and Figure 7 As shown, the aquatic plant cultivation frame 19 includes two connecting plates 20 spaced apart from each other, and the floating blocks 24 are fixed on the bottom of the connecting plates 20 .

[0065] A breeding frame body 21 is fixed between the left and right connecting plates 20. The breeding frame body 21 is an isosceles trapezoidal plate structure that is larger at the top and smaller at the bottom and open at the top. Vertically arranged side mesh panels 23 are fixed on the front and rear sides of the breeding frame body 21.

[0066] The breeding frame body 21 and the side mesh panels 23 are both made of permeable mesh.

[0067] The tops of the connecting plate 20, the breeding frame body 21 and the side mesh plates 23 are flush with each other, and an aquatic plant breeding area is enclosed between the breeding frame body 21 and the side mesh plates 23. The aquatic plant breeding area is used to breed aquatic plants that can control eutrophication of water bodies.

[0068] In order to prevent aquatic plants from accumulating on the right side of the aquatic plant breeding area under the push of water flow, resulting in the left area of ​​the aquatic plant breeding area being vacant and the efficiency of aquatic plants in absorbing nutrient-rich substances in the water being reduced, in this embodiment, a plurality of dividing mesh panels 22 spaced apart on the left and right are fixedly provided on the top of the bottom plate of the breeding frame body 21. The dividing mesh panels 22 extend in the front-to-back direction, and the front and rear ends of the dividing mesh panels 22 are fixedly connected to the adjacent side mesh panels 23. The top of the dividing mesh panels 22 is flush with the top of the connecting plate 20.

[0069] The partitioning mesh plate 22 is made of a permeable mesh so that water can flow directly through the partitioning mesh plate 22 .

[0070] In order to further stabilize the morphological stability of the aquatic plant cultivation frame 19 when it moves up and down, as shown in FIG. Figure 1 、 Figure 2 、 Figure 4 and Figure 6 As shown, the right side of the side plate 2 and the left and right sides of the gate plate 13 are provided with slide rails extending in the up-down direction, and an adapted slider is slidably provided on the slide rails;

[0071] The left and right outer ends of the connecting plate 20 on the aquatic plant cultivation frame 19 are respectively fixedly connected to the adjacent sliding blocks.

[0072] Specifically, in this embodiment, the number of gate plates 13 is set to three, and accordingly, the sliding rail member includes a second sliding rail 11 fixed on the right side of the side panel 2, a third sliding rail 15 fixed on the left side of the gate plate 13, and a fourth sliding rail 17 fixed on the right side of the gate plate 13. The slider member includes a second slider 12 slidably arranged on the second sliding rail 11, a third slider 16 slidably arranged on the third sliding rail 15, and a fourth slider 18 slidably arranged on the fourth sliding rail 17.

[0073] The aquatic plants in this embodiment include water hyacinth, arrowhead, cattail, duckweed, and water lily. The specific types of aquatic plants can be freely selected according to the ambient temperature, or different types of aquatic plants can be planted in multiple aquatic plant breeding frames 19.

[0074] A plurality of upper and lower overflow grooves 14 are provided on the gate plate 13 (in this embodiment, the number of the overflow grooves 14 is set to three), and the water outlets are provided in a small and numerous manner rather than using large-diameter water outlets, so that when the water flow in the ditch is slow and small, the gate plate 13 can accumulate water to meet the growth needs of aquatic plants in the aquatic plant breeding frame 19.

[0075] When the rainfall is heavy and rapid, the water flow in the ditch increases and the water flow speed accelerates. The aquatic plant cultivation frame 19 automatically floats up as the water level rises. The overflow troughs 14 of different heights and numbers through which the water flows automatically increase the instantaneous area through which the water flows, thereby achieving the purpose of automatically adjusting the height of the accumulated water level on the left side of the gate plate 13 and preventing the overflow trough 14 from being set too high or too low, causing the water to overflow the ditch and flow back into the farmland.

[0076] A method for using a biological treatment device for agricultural non-point source pollution comprises the following steps:

[0077] S1~ Install two side plates 2 spaced apart at the front and back of the ditch outlet where it enters the river or lake, and drive the lower ends of the side plates 2 into the ditch bottom 1 to secure the side plates 2 in the ditch.

[0078] S2~Pour concrete or pile sand and gravel between the side plates 2 and the side slope of the ditch to block the gap between the side plates 2 and the side slope of the ditch, so that a water channel for water flow is formed between the two side plates 2;

[0079] S3~Install the first filter 3 on the left side of the side panel 2;

[0080] S4~ Install the first slide rail 4, the first slider 5 and the salvage net 6 on the left side of the first filter screen 3;

[0081] S5~ Install bracket 7 on side panel 2, install manual winch 8 and fixed pulley mechanism 9 on bracket 7, fix and wind a lifting rope around manual winch 8, and make one end of the lifting rope pass around the fixed pulley from the bottom and then be fixedly connected to the lifting ring 604;

[0082] S6~On the right side of the side plate 2, the insert plate sections of the bottom of the multiple gate plates 13 are vertically driven into the ditch bottom 1 at intervals in the left-right direction, and the oblique sides of the isosceles trapezoidal plate sections of the gate plates 13 are placed against the side slope of the ditch;

[0083] S7~ Install the aquatic plant cultivation frame 19 between the side plate 2 and the gate plate 13 and between two adjacent gate plates 13, and fix the left and right outer ends of the connecting plate 20 of the aquatic plant cultivation frame 19 to the adjacent slider members respectively;

[0084] S8~ According to the division of the internal space of the aquatic plant cultivation frame 19 by the dividing mesh plate 22, aquatic plants capable of controlling eutrophication of the water body are planted on the water surface of the aquatic plant cultivation area;

[0085] S9~The salvage net 6 is regularly pulled out of the water surface by the manual winch 8 to clean the large particles of debris in the storage cavity 603 and attached to the vertical permeable net 601 and the storage net 602.

[0086] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is limited by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A biological treatment device for agricultural non-point source pollution, characterized by: It comprises two side plates (2) spaced apart from each other, the lower ends of the side plates (2) being driven into and fixed in the bottom of the ditch (1), and a water channel for water flow to pass through is formed between the two side plates (2); A first filter screen (3) extending in an up-down direction is fixedly connected to the left side of the two side plates (2), the lower end of the first filter screen (3) being against the bottom of the ditch bottom (1), and the first filter screen (3) being used to filter large particles of debris at the waterway entrance; A plurality of activated carbon plates (10) are fixedly connected between the two side plates (2) and arranged at intervals up and down, and the activated carbon plates (10) are arranged obliquely from left to right and from bottom to top; A plurality of gate plates (13) are provided on the right side of the side plate (2) at intervals. An overflow channel (14) for water flow is provided on the gate plate (13). The overflow channel (14) is a left-right transparent structure. Aquatic plant cultivation frames (19) are provided between the side panels (2) and the gate panels (13) and between two adjacent gate panels (13). The aquatic plant cultivation frames (19) are mesh frame structures with an upper opening made of a permeable mesh. Floating blocks (24) are fixedly provided at the bottoms of the left and right sides of the aquatic plant cultivation frames (19). The density of the floating blocks (24) is less than the density of water. The floating blocks (24) are used to make the aquatic plant cultivation frames (19) float on the water surface. The aquatic plant cultivation frame (19) is used for cultivating aquatic plants that can control eutrophication of water bodies; A first slide rail (4) extending in an up-down direction is fixedly provided on the left side of the first filter screen (3); a first slide block (5) capable of sliding up and down is provided on the first slide rail (4); A salvage net (6) is fixedly provided on the left side of the first slider (5), and the salvage net (6) comprises a vertical permeable net (601) arranged vertically. The right side of the vertical permeable net (601) is fixedly connected to the first slider (5), and a storage net (602) is fixedly provided on the left bottom of the vertical permeable net (601). The storage net (602) is a right-angled trapezoidal structure with a larger upper portion and a smaller lower portion and an upper opening. A storage cavity (603) for filtering out and storing large particles of debris is formed between the storage net (602) and the vertical permeable net (601); The vertical permeable net (601) and the storage net (602) are both made of permeable nets; The bottom of the storage net (602) rests against the bottom of the ditch (1), the top of the vertical permeable net (601) extends above the ground at the front and rear sides of the ditch, and a hanging ring (604) is fixed to the top of the vertical permeable net (601); A bracket (7) is fixedly provided on the side panel (2), and a fixed pulley mechanism (9) and a manual winch (8) are fixedly provided on the bracket (7); The fixed pulley mechanism (9) comprises a pulley bracket and a fixed pulley rotatably mounted on the pulley bracket, wherein the fixed pulley is located on the left side of the manual winch (8); A lifting rope is fixedly wound around the manual winch (8), one end of the lifting rope passes through the fixed pulley from the bottom and is fixedly connected to the lifting ring (604); The aquatic plant cultivation frame (19) includes two connecting plates (20) spaced apart from each other, and the floating blocks (24) are fixedly arranged at the bottom of the connecting plates (20); A breeding frame body (21) is fixedly provided between the left and right connecting plates (20). The breeding frame body (21) is an isosceles trapezoidal plate structure that is larger at the top and smaller at the bottom and has an upper opening. Vertically arranged side mesh plates (23) are fixedly provided on the front and rear sides of the breeding frame body (21). The breeding frame body (21) and the side net plates (23) are both made of permeable nets; The tops of the connecting plate (20), the breeding frame body (21) and the side net plate (23) are flush with each other, and an aquatic plant breeding area is enclosed between the breeding frame body (21) and the side net plate (23), and the aquatic plant breeding area is used to breed aquatic plants that can control eutrophication of water bodies; A plurality of partitioning mesh panels (22) are fixedly provided on the top of the bottom plate of the breeding frame body (21) and are spaced apart from each other. The partitioning mesh panels (22) extend in the front-to-back direction. The front and rear ends of the partitioning mesh panels (22) are fixedly connected to the adjacent side mesh panels (23). The top of the partitioning mesh panels (22) is flush with the top of the connecting plate (20). The dividing mesh plate (22) is made of a permeable mesh; The right side of the side plate (2) and the left and right sides of the gate plate (13) are both provided with a slide rail member extending in the up-down direction, and an adapted slider member is slidably provided on the slide rail member; The left and right outer ends of the connecting plate (20) on the aquatic plant cultivation frame (19) are respectively fixedly connected to the adjacent slider members.

2. The biological treatment device for agricultural non-point source pollution according to claim 1, characterized in that: The gate plate (13) includes an isosceles trapezoidal plate section and an inserting plate section, wherein the inserting plate section is fixedly arranged at the bottom of the isosceles trapezoidal plate section, and the inserting plate section is used to be inserted into and fixed at the bottom of the ditch (1), and the oblique side of the isosceles trapezoidal plate section abuts against the side slope of the ditch, and the isosceles trapezoidal plate section is provided with a plurality of overflow grooves (14) spaced apart from each other.

3. The method for using the agricultural non-point source pollution biological treatment device according to claim 1 or 2, characterized in that: The following steps are involved: S1~ Install two side plates (2) spaced apart from each other at the outlet of the ditch into the river or lake, and drive the lower ends of the side plates (2) into the bottom (1) of the ditch to fix the side plates (2) in the ditch. S2~ pouring concrete or piling sand and gravel between the side plates (2) and the side slope of the ditch to block the gap between the side plates (2) and the side slope of the ditch, so that a water channel for water flow is formed between the two side plates (2); S3~ Install the first filter (3) on the left side of the side panel (2); S4~ Installing a first slide rail (4), a first slider (5) and a salvage net (6) on the left side of the first filter screen (3); S5~ Install a bracket (7) on the side plate (2), install a manual winch (8) and a fixed pulley mechanism (9) on the bracket (7), fix and wind a lifting rope around the manual winch (8), and make one end of the lifting rope pass around the fixed pulley from the bottom and then be fixedly connected to the lifting ring (604); S6~On the right side of the side plate (2), the insert plate sections at the bottom of the plurality of gate plates (13) are vertically driven into the bottom of the ditch (1) at intervals along the left and right directions, and the oblique sides of the isosceles trapezoidal plate sections of the gate plates (13) are made to rest against the side slope of the ditch; S7~ Installing an aquatic plant cultivation frame (19) between the side plate (2) and the gate plate (13) and between two adjacent gate plates (13), and fixing the left and right outer ends of the connecting plate (20) of the aquatic plant cultivation frame (19) to the adjacent slider members respectively; S8~ According to the partitioning of the internal space of the aquatic plant cultivation frame (19) by the partitioning mesh plate (22), aquatic plants capable of controlling eutrophication of the water body are planted on the water surface of the aquatic plant cultivation area; S9~ The salvage net (6) is regularly pulled out of the water surface by a manual winch (8) to clean the large particles of debris in the storage cavity (603) and attached to the vertical permeable net (601) and the storage net (602).

Images