A root zone drip irrigation system for agricultural non-point source sewage purification and its application

Abstract

The invention discloses a root zone drip irrigation system for purifying agricultural non-point source sewage and its application, comprising a conical water pool, a coupled micro-power water purifier and a claw-type drip irrigation device. The conical water pool is connected with a rural non-point source sewage pipeline through a water inlet pipe, the coupled micro-power water purifier is arranged in the conical water pool, and the claw-type drip irrigation device is connected with a clean water pool in the center of the conical water pool. When in use, rural non-point source sewage flows into the conical sewage pool through the water inlet pipe to be purified, and the purified water is used to irrigate crops in root zones through the claw-type drip irrigation device. The drip irrigation system has an ingenious structure, is energy-saving and environmentally friendly, can realize precise water-saving drip irrigation, and ensures that the roots of crops grow evenly distributed. It has the characteristics of low operating energy consumption, simple operation, environmental protection and high efficiency, and can improve sanitary conditions in rural areas and beautify the rural environment.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural drip irrigation, and in particular to a root zone drip irrigation system for purifying agricultural non-point source sewage and an application thereof. Background Art

[0002] With the rise of global temperature, water resources are becoming increasingly scarce. The scarce water resources seriously restrict the development of my country's agriculture. In my country's northwest planting areas, the situation that the lack of water resources affects planting is particularly obvious. Using non-point source sewage in rural areas for irrigation has become one of the environmentally friendly ways to alleviate the shortage of water resources. At present, the most commonly used irrigation methods are flooding, furrow irrigation, drip irrigation and sprinkler irrigation, and drip irrigation and sprinkler irrigation have obvious advantages in efficient water saving. From the perspective of plant absorption of water, drip irrigation can achieve precise irrigation, so that plants can absorb water and nutrients more fully.

[0003] Agricultural non-point source sewage mainly includes sewage discharged from rural life, sewage discharged with farmland drainage from fertilizers and pesticides, and sewage discharged from livestock and poultry breeding; these sewage have become the most widespread and most important pollution, polluting water bodies with surface runoff and soil infiltration;

[0004] There are many studies on drip irrigation and sprinkler irrigation in China. Most of the existing drip irrigation technologies use reservoirs or groundwater as the drip irrigation water source, which wastes a lot of water resources. In terms of precision irrigation, most scholars' research focuses on precise monitoring and quantitative fertilization, and few use local non-point source sewage for precise root zone irrigation. Summary of the invention

[0005] In view of the above-mentioned problems, a root zone drip irrigation system for purifying agricultural non-point source sewage and its application are proposed. The drip irrigation system includes a conical sewage pool, a coupled micro-power water purifier and a claw-type drip irrigation device. When in use, rural non-point source sewage flows into the conical sewage pool through an inlet pipe and is purified. The purified water is used to irrigate the crops in their root zones through the claw-type drip irrigation device. The drip irrigation system has an ingenious structure, is energy-saving and environmentally friendly, can achieve precise water-saving drip irrigation, and ensures that the roots of crops are evenly distributed and grow. It is simple to operate, environmentally friendly and efficient, easy to maintain, and recyclable.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A root zone drip irrigation system for purifying agricultural non-point source sewage, comprising a conical water pool, a coupled micro-powered water purifier and a claw-type drip irrigation device, wherein the conical water pool is connected to a rural non-point source sewage pipeline through a water inlet pipe, the coupled micro-powered water purifier is arranged in the conical water pool, and the claw-type drip irrigation device is connected to a clean water pool at the center of the conical water pool;

[0008] The coupled micro-powered water purifier is a cylindrical water purification body, which includes a sewage collection box, a graphene-modified biochar membrane layer, a microbial root box and a photocatalytic reactor from the outside to the inside;

[0009] The claw-type drip irrigation device comprises a water delivery pipe, a pressure pump, an irrigation main pipe, an irrigation branch pipe and a dripper. The pressure pump is arranged at the bottom of the clean water pool. One end of the water delivery pipe is connected to the pressure pump, and the other end is connected to the irrigation main pipe through a stop valve and a drip irrigation joint. The irrigation branch pipes are equidistantly arranged on the irrigation main pipe, and the irrigation branch pipes are connected to the dripper through a switching structure.

[0010] Preferably, the pollution collection box is made of a stainless steel wire mesh, and the gap diameter of the stainless steel wire mesh is 5 mm; the microbial root box and the photocatalytic reactor are separated by a geotextile.

[0011] Preferably, a layer of graphene-modified biochar membrane is provided in the coupled micro-powered water purifier, and the graphene-modified biochar membrane layer is a membrane structure formed by attaching graphene-modified modified biochar powder to foam copper with through holes.

[0012] Preferably, the microbial root box is a cultivated reed root box, the interior of the box is provided with an iron-carbon soil layer, a biological ceramsite layer and a pebble layer from top to bottom, a number of reeds are planted in the box, and the box is a stainless steel cylinder with four sides hollowed out.

[0013] Preferably, the photocatalytic reactor is composed of a xenon lamp strip and a core-shell magnetic Tio2 microsphere gel layer, wherein 8 xenon lamp strips are evenly and vertically distributed along the outer wall of the water purification pool partition, and the core-shell magnetic Tio2 microsphere gel layer is wrapped with a 24-mesh super-transparent wire mesh.

[0014] Preferably, the transfer structure includes a socket joint and a connecting hose, the water inlet end of the socket joint is connected to the end of the irrigation branch pipe, the water delivery end is connected to the connecting hose, and the dripper is installed at the end of the connecting hose.

[0015] Preferably, the vertical lengths of the drippers are 10 cm, 15 cm, 20 cm, 30 cm and 35 cm respectively.

[0016] Preferably, the water inlet pipe is symmetrically arranged on both sides of the upper end of the conical water pool, the height of the conical water pool is 1.5m, the inner diameter is 5m, and the bottom of the water pool is a circular flat bottom with an inner diameter of 1m; the clean water pool is arranged on the inner side of the photocatalytic reactor, the side panels around the clean water pool are made of partitions, and one-way water inlets are evenly distributed on the bottom. The height of the clean water pool is 1m, and the inner diameter is 1m.

[0017] Preferably, the production process of the core-shell magnetic TiO2 microsphere gel is as follows:

[0018] N-isopropylacrylamide, N,N'0-methylenebisacrylamide and deionized water are dissolved and mixed at room temperature, and after being mixed evenly, a certain weight ratio of core-shell magnetic Tio2 microspheres are added and mixed again. After being mixed evenly, the mixed solution is poured into a gel mold, and nitrogen is passed through a cold water bath for minutes. After being placed in a refrigerator and allowed to stand for 24 hours, the gel is taken out, cut into thin slices perpendicular to the gel direction, and placed in clean water to obtain a curled core-shell magnetic Tio2 microsphere gel;

[0019] The weight ratio of the added N-isopropylacrylamide: N,N'0-methylenebisacrylamide: ionized water: core-shell magnetic Tio microspheres is 30:2:15:15; the gel mold is a black cube of 30cm*30cm*10cm, the cube cover can be opened, and a 1mm wide black partition is distributed every 5mm inside.

[0020] Irrigation using a root zone drip irrigation system with non-point source wastewater treatment, including

[0021] Step 1: After the sewage flows into the conical sewage pool through the water inlet, it first passes through the sewage box and graphene-modified biochar membrane in the coupled micro-power water purifier under the action of gravity. The sewage box intercepts the solid pollutants insoluble in water, and the graphene-modified biochar membrane can absorb lipid organic matter and heavy metal toxic substances in non-point source polluted water to reduce the turbidity of the water;

[0022] Step 2: When the sewage further flows through the microbial root box in the coupled micro-powered water purifier, the filler layer adsorbs the pollutants, and a large number of microorganisms and bacteria gathered at the roots can utilize the nitrogen and phosphorus nutrients in the sewage, degrade them, and remove nitrogen and phosphorus;

[0023] Step 3: When the sewage passes through the photocatalytic reactor, the core-shell magnetic Tio2 microsphere gel can completely degrade the refractory organic pollutants and phenolic organic matter under the action of photocatalysis;

[0024] Step 4: The purified water flows into the water purification pool through the one-way water inlet, and driven by the pressure pump, passes through the irrigation main pipe and then through the dripper to irrigate the root zone of the tea tree.

[0025] The beneficial effects of the present invention are as follows: the present invention discloses a root zone drip irrigation system for purifying agricultural non-point source sewage and its application. Compared with the prior art, the improvements of the present invention are as follows:

[0026] (1) The present invention designs a root zone drip irrigation system for purifying agricultural non-point source sewage, comprising a conical water pool, a coupled micro-powered water purifier and a claw-type drip irrigation device, wherein the coupled micro-powered water purifier comprises a sewage collection box, a graphene-modified biochar membrane layer, a microbial root box and a photocatalytic reactor. When in use, the graphene-modified biochar membrane adsorbs lipid organic matter and heavy metals, which can extend the use time of subsequent devices and improve the treatment efficiency of pollutants. At the same time, the graphene-modified biochar membrane has a rich pore structure, which improves the adsorption effect and has strong permeability, so that the sewage can flow smoothly to the next treatment unit; the microbial root box has a large number of roots, which is rich in microorganisms and bacteria, and improves the removal efficiency of nitrogen and phosphorus; the core-shell magnetic Tio2 microsphere gel in the photocatalytic reactor can be recycled and reused after treatment without generating secondary pollution;

[0027] (2) At the same time, the claw drip irrigation device can bury the claw dripper in the soil at different depths, and can drip water in a quantitative manner according to the needs of different root layers of plants, thus efficiently saving water resources. This irrigation device has the advantages of low energy consumption, simple operation, environmental protection and high efficiency, and can improve sanitary conditions in rural areas and beautify the rural environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the root zone drip irrigation system for agricultural non-point source sewage treatment according to the present invention.

[0029] Figure 2 Schematic diagram of the structure of the coupled micro-powered water purifier of the present invention.

[0030] Figure 3 A top view of the coupled micro-powered water purifier of the present invention.

[0031] Figure 4 A cross-sectional view of the claw-type dripper of the present invention.

[0032] Figure 5 Schematic diagram of the microbial root box of the present invention.

[0033] Figure 6 Schematic diagram of the gel mold of the present invention.

[0034] Among them: 1. Water inlet pipe, 2. Conical water pool, 3. Coupled micro-power water purifier, 4. Stop valve, 5. Claw-type drip irrigation device, 6. Water pipe, 7. Pressure pump, 8. One-way water inlet, 9. Tea tree, 10. Foam copper, 11. Graphene-modified biochar membrane, 12. Reed, 13. Geotextile, 14. Photocatalytic reactor, 15. Microbial root box, 16. Xenon lamp strip, 17. Water purification pool, 18 Dripper, 19. Socket joint, 20. Irrigation branch pipe, 21. Connecting hose, 22. Iron-carbon soil layer, 23. Stainless steel cylinder, 24. Bioceramsite layer, 25. Pebble layer, 26. Black partition, 27. Cube cover, 28. Stainless steel wire mesh, 29. Drip irrigation joint, 30. Irrigation main pipe, 31. Sewage box. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0036] See attached Figure 1-6 A root zone drip irrigation system for purifying agricultural non-point source sewage and its application are shown, wherein the root zone drip irrigation system for purifying agricultural non-point source sewage includes a conical pool 2, a coupled micro-powered water purifier 3 and a claw-type drip irrigation device 5, the conical pool 2 is connected to the rural non-point source sewage pipeline through an inlet pipe 1, and the sewage in the rural non-point source sewage pipeline is introduced into the conical pool 2, the coupled micro-powered water purifier 3 is arranged in the conical pool 2, and the sewage is purified, and the purified water infiltrates into the clean water pool 17 at the center of the conical pool 2, the claw-type drip irrigation device 5 is connected to the clean water pool 17, and the clean water in the clean water pool 17 is pumped out to drip irrigate the tea trees 9; the coupled micro-powered water purifier The device 3 is a cylindrical water purification body, which includes a sewage box 31, a graphene-modified biochar membrane layer 11, a microbial root box 15 and a photocatalytic reactor 14 from the outside to the inside. When in use, the sewage box 31 is used to intercept water-insoluble solid pollutants, the graphene-modified biochar membrane 11 adsorbs lipid organic matter and heavy metal toxic substances in non-point source polluted water to reduce the turbidity of the water, and the microbial root box 15 utilizes nitrogen and phosphorus nutrients in the sewage to degrade them and remove nitrogen and phosphorus. The core-shell magnetic Tio2 microsphere gel of the photocatalytic reactor 14 can completely degrade difficult-to-degrade organic pollutants and phenolic organic matter under the action of photocatalysis, and the purified water enters the clean water pool 17 through the one-way water inlet 8;

[0037] The claw-type drip irrigation device 5 includes a water delivery pipe 6, a pressure pump 7, an irrigation main pipe 30, an irrigation branch pipe 20 and a dripper 18. The pressure pump 7 is arranged at the bottom of the clean water pool 17 to pump water out of the clean water pool 17. One end of the water delivery pipe 6 is connected to the pressure pump 7, and the other end is connected to the irrigation main pipe 30 through a stop valve 4 and a drip irrigation joint 29. The irrigation branch pipes 20 are equidistantly arranged on the irrigation main pipe 30, and the irrigation branch pipes 20 are connected to the dripper 18 through a switching structure. When in use, the root zone of the tea tree is irrigated through the irrigation main pipe 30 and then through the dripper 18 under the drive of the pressure pump 7.

[0038] Preferably, in order to intercept the water-insoluble solid pollutants, the pollutant removal box 31 is made of a stainless steel wire mesh 28, and the gap diameter of the stainless steel wire mesh 28 is 5 mm;

[0039] Preferably, in order to avoid water reverse osmosis, the microbial root box 15 and the photocatalytic reactor 14 are separated by a geotextile 13, and the coupled micro-powered water purifier 3 has an outer diameter of 1.3 m, an inner diameter of 1.0 m, and a height of 1 m.

[0040] Preferably, the graphene-modified biochar membrane layer 11 is a membrane structure formed by attaching graphene-modified modified biochar powder to a foam copper 10 having a large number of through holes. The graphene-modified biochar membrane can be taken out and replaced after being used for a period of time, and the graphene-modified biochar can be reattached after backwashing. At the same time, in order to ensure that the graphene-modified biochar membrane 11 can adsorb lipid organic matter and heavy metal toxic substances in non-point source polluted water and reduce the turbidity of water, three layers of graphene-modified biochar membranes 11 are arranged in the coupled micro-power water purifier 3; at the same time, the graphene-modified biochar membrane layer 11 has a rich void structure, which improves the adsorption effect, and has strong permeability, so that the sewage can flow smoothly to the next treatment unit.

[0041] Preferably, the microbial root box 15 is a cultivated reed root box, and the inside of the box is provided with an iron-carbon soil layer 22, a biological ceramsite layer 24 and a pebble layer 25 in sequence from top to bottom. A number of reeds 12 are planted in the box, and the reed root system grows vertically to the entire box after induced culture. A large number of microorganisms are loaded around the root system. When in use, the iron-carbon soil layer 22, the biological ceramsite layer 24 and the pebble layer 25 and other filler layers are used to adsorb pollutants in the water. A large number of microorganisms and bacteria gathered at the roots of the reeds can utilize the nitrogen and phosphorus nutrients in the sewage and degrade them, thereby achieving the effect of denitrification and phosphorus removal; the box is a stainless steel cylinder 23 with four hollow sides, and the height of the stainless steel cylinder 23 is 1m and the diameter is 20cm.

[0042] Preferably, the photocatalytic reactor 14 is composed of a xenon lamp strip 16 and a core-shell type magnetic Tio2 microsphere gel layer, wherein 8 xenon lamp strips 16 are evenly and vertically distributed along the outer wall of the water purification pool partition, and the core-shell type magnetic Tio2 microsphere gel layer is wrapped with a 24-mesh super-transparent wire mesh.

[0043] Preferably, the transfer structure includes a joint socket 19 and a connecting hose 21, the water inlet end of the joint socket 19 is connected to the end of the irrigation branch pipe 20, and the water delivery end is connected to the connecting hose 21, and the dripper 18 is installed at the end of the connecting hose 21. In order to ensure a good transfer effect, the joint socket 19 preferably uses a six-way joint socket, and the five water delivery sections of the six-way joint socket are all connected to the corresponding connecting hose 21; and the vertical lengths of the dripper 18 are 10 cm, 15 cm, 20 cm, 30 cm and 35 cm respectively. When in use, 5 holes of different depths are evenly drilled around the tea tree 9, and the dripper is pre-inserted for irrigation.

[0044] Preferably, the water inlet pipe 1 is symmetrically arranged on both sides of the upper end of the conical water pool 2, the height of the conical water pool 2 is 1.5m, the inner diameter is 5m, and the bottom of the water pool is a circular flat bottom with an inner diameter of 1m;

[0045] Preferably, the clean water pool 17 is arranged on the inner side of the photocatalytic reactor 14, the side panels around the clean water pool are made of partitions, and 8 one-way water inlets 8 are evenly distributed on the bottom. The purified water flows into the clean water pool 17 through the one-way water inlets 8. The clean water pool 17 has a height of 1m and an inner diameter of 1m.

[0046] Wherein: the production process of the core-shell magnetic TiO2 microsphere gel includes:

[0047] N-isopropylacrylamide, N,N'0-methylenebisacrylamide and deionized water are dissolved and mixed at room temperature, and after being mixed evenly, a certain weight ratio of core-shell magnetic Tio2 microspheres is added and mixed again. After being mixed evenly, the mixed solution is poured into a gel mold, and nitrogen is passed through a cold water bath for 30 minutes. After being placed in a refrigerator and allowed to stand for 24 hours, the gel is taken out, cut into thin slices perpendicular to the gel direction, and placed in clean water to obtain a curled core-shell magnetic Tio2 microsphere gel;

[0048] Wherein: the weight ratio of the added N-isopropylacrylamide: N,N'0-methylenebisacrylamide: ionized water: core-shell magnetic Tio2 microspheres is 30:2:15:15; the core-shell magnetic Tio2 microspheres can be separated by an external magnetic field after being used for a period of time, while ensuring the continuous use of catalytic performance and being recycled multiple times.

[0049] Preferably, the gel mold is a black cube 27 of 30 cm*30 cm*10 cm, the cover of the cube can be opened, and a 1 mm wide black partition 26 is distributed inside at intervals of 5 mm.

[0050] Example 1: Irrigation is performed using the root zone drip irrigation system for non-point source sewage treatment according to the present invention, the steps of which include:

[0051] Step 1: After the sewage flows into the conical sewage pool 2 through the water inlet 1, it first passes through the sewage box 31 and the graphene-modified biochar membrane 11 in the coupled micro-power water purifier 3 under the action of gravity. The sewage box 31 intercepts the solid pollutants insoluble in water, and the graphene-modified biochar membrane 11 can adsorb lipid organic matter and heavy metal toxic substances in non-point source polluted water to reduce the turbidity of the water. At the same time, the graphene-modified biochar membrane 11 has good permeability and rich pore structure, which can gather oils and heavy metals on the membrane;

[0052] Step 2: When the sewage further flows through the microbial root box 15 in the coupled micro-powered water purifier 3, the filler layer adsorbs the pollutants, and a large number of microorganisms and bacteria gathered at the roots of the reeds can utilize the nitrogen and phosphorus nutrients in the sewage and degrade them, thereby achieving the effect of nitrogen removal and phosphorus removal;

[0053] Step 3: Since the COD in non-point source sewage seriously exceeds the standard, after adsorption, filtration and degradation by the graphene-modified biochar membrane 11 and the microbial root box 15, it is impossible to remove all small molecular organic pollutants. When the sewage passes through the photocatalytic reactor 14, the core-shell magnetic Tio2 microsphere gel can completely degrade the difficult-to-degrade organic pollutants and phenolic organic matter under the action of photocatalysis;

[0054] Step 4: The purified water flows into the clean water pool 17 through the one-way water inlet 8, and driven by the pressure pump 7, passes through the irrigation main pipe 30, and then through the dripper 18 to irrigate the root zone of the tea tree 9, thereby achieving precision irrigation of the tea tree 9.

[0055] The root zone drip irrigation system for non-point source sewage treatment fills the gap in the current lack of precision irrigation technology using agricultural non-point source sewage in my country. It can purify agricultural non-point source sewage and then accurately irrigate the roots of tea trees in root zones. It not only effectively purifies sewage and improves the rural environment, but also effectively saves water resources. It has the characteristics of simple operation, environmental friendliness, and low energy consumption.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A root zone drip irrigation system for agricultural non-point source sewage purification, characterized by: The invention comprises a conical water pool (2), a coupled micro-powered water purifier (3) and a claw-type drip irrigation device (5); the conical water pool (2) is connected to a rural non-point source sewage pipeline via a water inlet pipe (1); the coupled micro-powered water purifier (3) is arranged in the conical water pool (2); and the claw-type drip irrigation device (5) is connected to a clean water pool (17) at the center of the conical water pool (2); The coupled micro-powered water purifier (3) is a cylindrical water purifier, which comprises, from the outside to the inside, a sewage collection box (31), a graphene-modified biochar membrane (11), a microbial root box (15), and a photocatalytic reactor (14); The claw-type drip irrigation device (5) comprises a water delivery pipe (6), a pressure pump (7), an irrigation main pipe (30), an irrigation branch pipe (20) and a dripper (18); the pressure pump (7) is arranged at the bottom of the clean water pool (17); one end of the water delivery pipe (6) is connected to the pressure pump (7), and the other end is connected to the irrigation main pipe (30) via a stop valve (4) and a drip irrigation joint (29); the irrigation branch pipes (20) are equidistantly arranged on the irrigation main pipe (30), and the irrigation branch pipes (20) are connected to the dripper (18) via a transfer structure; The coupled micro-powered water purifier (3) is provided with three layers of graphene-modified biochar membranes (11), wherein the graphene-modified biochar membranes (11) are membrane structures formed by attaching graphene-modified modified biochar powder to a foam copper (10) having through holes; The microbial root box (15) is a cultivated reed root box, wherein an iron-carbon soil layer (22), a biological ceramsite layer (24) and a pebble layer (25) are arranged in sequence from top to bottom inside the box, and a plurality of reeds (12) are planted inside the box. The box is a stainless steel cylinder (23) with four sides hollowed out; The photocatalytic reactor (14) is composed of a xenon lamp strip (16) and a core-shell magnetic Tio2 microsphere gel layer, wherein eight xenon lamp strips (16) are evenly and vertically distributed along the outer wall of the water purification pool partition, and the core-shell magnetic Tio2 microsphere gel layer is wrapped with a 24-mesh super-transparent wire mesh; The production process of the core-shell magnetic TiO2 microsphere gel includes: N-isopropylacrylamide, N,N'0-methylenebisacrylamide and deionized water are dissolved and mixed at room temperature, and after being mixed evenly, a certain weight ratio of core-shell magnetic Tio2 microspheres is added and mixed again. After being mixed evenly, the mixed solution is poured into a gel mold, and nitrogen is passed through a cold water bath for 30 minutes. After being placed in a refrigerator and allowed to stand for 24 hours, the gel is taken out, cut into thin slices perpendicular to the gel direction, and placed in clean water to obtain a curled core-shell magnetic Tio2 microsphere gel; Wherein: the weight ratio of the added N-isopropylacrylamide: N,N'0-methylenebisacrylamide: ionized water: core-shell magnetic Tio2 microspheres is 30:2:15:15; the gel mold is A black cube (27) is provided, the cover of the cube can be opened, and a 1 mm wide black partition (26) is distributed inside at intervals of 5 mm.

2. The root zone drip irrigation system for purifying agricultural non-point source wastewater according to claim 1, characterized in that: The pollution collection box (31) is made of a stainless steel wire mesh (28), and the diameter of the gaps in the stainless steel wire mesh (28) is 5 mm; the microbial root box (15) and the photocatalytic reactor (14) are separated by a geotextile (13).

3. The root zone drip irrigation system for purifying agricultural non-point source wastewater according to claim 1, characterized in that: The transfer structure comprises a joint socket (19) and a connecting hose (21); the water inlet end of the joint socket (19) is connected to the end of the irrigation branch pipe (20), the water delivery end is connected to the connecting hose (21), and the dripper (18) is installed at the end of the connecting hose (21).

4. The root zone drip irrigation system for purifying agricultural non-point source wastewater according to claim 3, characterized in that: The vertical lengths of the drippers (18) are 10 cm, 15 cm, 20 cm, 30 cm and 35 cm respectively.

5. A root zone drip irrigation system for purifying agricultural non-point source wastewater according to any one of claims 1 to 4, characterized in that: The water inlet pipe (1) is symmetrically arranged on both sides of the upper end of the conical water pool (2). The conical water pool (2) has a height of 1.5 m and an inner diameter of 5 m. The bottom of the water pool is a circular flat bottom with an inner diameter of 1 m. The clean water pool (17) is arranged on the inner side of the photocatalytic reactor (14). The side panels around the clean water pool are made of partitions. Eight one-way water inlets (8) are evenly distributed on the bottom. The clean water pool (17) has a height of 1 m and an inner diameter of 1 m.

6. The root zone drip irrigation system for purifying agricultural non-point source wastewater according to claim 1 is used for irrigation, characterized in that: include Step 1: After the sewage flows into the conical sewage pool through the water inlet, it first passes through the sewage box and graphene-modified biochar membrane in the coupled micro-power water purifier under the action of gravity. The sewage box intercepts the solid pollutants insoluble in water, and the graphene-modified biochar membrane can absorb lipid organic matter and heavy metal toxic substances in non-point source polluted water to reduce the turbidity of the water; Step 2: When the sewage further flows through the microbial root box in the coupled micro-powered water purifier, the filler layer adsorbs the pollutants, and a large number of microorganisms and bacteria gathered at the roots can utilize the nitrogen and phosphorus nutrients in the sewage, degrade them, and remove nitrogen and phosphorus; Step 3: When the sewage passes through the photocatalytic reactor, the core-shell magnetic Tio2 microsphere gel can completely degrade the refractory organic pollutants and phenolic organic matter under the action of photocatalysis; Step 4: The purified water flows into the water purification pool through the one-way water inlet, and driven by the pressure pump, passes through the irrigation main pipe and then through the dripper to irrigate the root zone of the tea tree.

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