Agricultural field water purification and reuse system

Abstract

The present application belongs to the field of non-point source pollution control of farmland, and particularly relates to a water purification and recycling system for farmland. The water purification and recycling system for farmland comprises an overflow filter dam, a soil filter system, a clean water storage system and a clean water recycling system. The overflow filter dam can be detachably fixed in the farmland drainage ditch and multiple overflow filter dams are arranged in parallel and at intervals along the water flow direction. The overflow filter dam is used for purifying the water discharged from the farmland. The soil filter system is arranged below the overflow filter dam and used for filtering the water filtered by the overflow filter dam at least once. The clean water storage system is used for storing the water filtered by the soil filter system. The clean water recycling system is connected with the clean water storage system, the overflow filter dam and the farmland irrigation equipment, so as to use the stored purified water to irrigate the farmland and flush the filter structure in the overflow filter dam. The present application solves the problems of ecological system destruction caused by agricultural non-point source pollution and farmland yield reduction caused by extreme climate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of control of agricultural non-point source pollution, and particularly relates to a water purification and recycling system for farmland. BACKGROUND

[0002] At present, with the development and application of a plurality of modern planting technologies and products, such as intelligent recommended fertilization technology, water and fertilizer integration technology, development and application technology of new type high-efficiency multifunctional fertilizer, and development and application technology of new type pesticide product, the yield of farmland has been effectively improved. In recent years, China has vigorously promoted the construction of high-standard farmland, and built high-standard basic farmland which is concentrated and contiguous, facility-supported, high-yield and stable-yield, ecologically good, strong in disaster resistance, and adapted to modern agricultural production and operation mode, effectively guaranteeing the grain yield of China.

[0003] Although the production guarantee measures of farmland in China have achieved certain results, the construction of high-standard farmland is still in its infancy, and various risk factors are not fully considered in the transformation and upgrading, and the prevention and control ability of agricultural non-point source pollution is weak, while the agricultural non-point source pollution is an important factor causing eutrophication of natural water bodies such as rivers and lakes; in addition, the prevention and control ability of farmland yield reduction caused by extreme climate, especially extreme precipitation, is poor.

[0004] Therefore, the present application patent proposes a water purification and recycling system for farmland aiming at agricultural non-point source pollution and extreme climate (heavy precipitation and drought). SUMMARY

[0005] The present application provides a water purification and recycling system for farmland to solve the problems of ecological system destruction caused by agricultural non-point source pollution and farmland yield reduction caused by extreme climate.

[0006] To solve the above problems, the water purification and recycling system for farmland provided by the present application adopts the following technical scheme:

[0007] The water purification and recycling system for farmland comprises an overflow filter dam, a soil filter system, a purified water storage system and a purified water recycling system.

[0008] The overflow filter dam is fixed in the farmland drainage ditch and is arranged in parallel and at intervals along the water flow direction, and is used for purifying water discharged from the farmland.

[0009] The soil filter system is arranged below the overflow filter dam and is used for secondary filtering of water filtered by at least one overflow filter dam.

[0010] The purified water storage system is used for collecting and storing water filtered by the soil filter system.

[0011] The water purification recycling system is connected with the water purification storage system, the overflow filter dam and the corresponding farmland irrigation equipment to utilize the stored purified water to irrigate farmland and flush the filter structure in the overflow filter dam.

[0012] Further, the overflow filter dam comprises a dam body and a filter layer connected to the bottom of the dam body, the inside of the dam body is a hollow structure, and the dam body is provided with a water supplement hole and a water outlet hole in communication with the inside space thereof; the filter layer comprises a grid layer, a microbial filter layer and a fixed layer arranged in sequence from front to back along the water flow direction, the microbial filter layer is located below the water outlet hole and forms the filter structure, the microbial filter layer is arranged on the fixed layer, and the fixed layer is a hollow structure; the water supplement hole is connected with the water purification recycling system.

[0013] Further, the microbial filter layer comprises a sponge layer, an aerobic microbial layer and a facultative anaerobic microbial layer arranged in sequence from top to bottom.

[0014] Further, the dam body is a tooth-shaped structure, the top of the dam body is provided with a plurality of tooth walls arranged at intervals along the length direction of the dam body, and an overflow groove is formed between adjacent two tooth walls.

[0015] Further, the water purification storage system comprises a water purification collection pipe and a water purification storage well, the water purification collection pipe extends along the arrangement direction of the overflow filter dam and is arranged at intervals in the length direction of the dam body, and a plurality of water body collection holes are arranged on the water purification collection pipe; each water purification collection pipe is connected with the water purification storage well; the water purification recycling system comprises a first water supplement pump arranged in the water purification storage well, and the first water supplement pump is connected with the water supplement hole on the corresponding dam body through a first water supplement pipe.

[0016] Further, the first water supplement pump is provided with one, the first water supplement pipe comprises a water supplement main pipe and a water supplement branch pipe connected to the water supplement main pipe, the water supplement branch pipe corresponds to the dam body one by one and is connected with the water supplement hole on the dam body.

[0017] Further, the water purification recycling system further comprises an irrigation well, the irrigation well is connected with the water purification storage well through an overflow pipe, an irrigation water pump is arranged in the irrigation well, and an irrigation water suction pipe for connecting with the farmland irrigation equipment is connected to the irrigation water pump.

[0018] Further, a water purification water pump is arranged in the water purification storage well, and the water purification water pump is connected with the irrigation water pump through a water purification water suction pipe.

[0019] Further, a second water supplement pump is further arranged in the irrigation well, a second water supplement pipe in communication with the water purification storage well is connected to the second water supplement pump to supplement water into the water purification storage well through the irrigation well, and the second water supplement pipe is located below the overflow pipe.

[0020] Further, the soil filtering system comprises a coarse-grained gravel layer, a fine-grained gravel layer and a soil layer arranged from top to bottom, the thickness of the coarse-grained gravel layer ranges from 5 to 10 cm, the thickness of the fine-grained gravel layer ranges from 5 to 10 cm, and the thickness of the soil layer ranges from 10 to 15 cm.

[0021] The present application has the following advantages:

[0022] The overflow filtering dam can not only play a role in flood discharge, but also play a filtering role. When the farmland is too wet due to rainfall or irrigation, the excess water is discharged into the farmland drainage ditch through the farmland drainage system. The water can be discharged along the overflow groove on the dam body. The microbial filtering layer below the dam body can supplement the microorganisms that can effectively decompose residual pesticides, fertilizers and other pollutants. The grid layer below the dam body can filter the garbage and pollutants floating in the water. The water flowing from the farmland drainage ditch into rivers, lakes and other water bodies is clean after being filtered by the multi-stage filtering system, which does not affect the environment and achieves the purpose of pollution prevention. In addition, the water filtered by the overflow filtering dam is infiltrated into the ground through the soil filtering system and collected and stored in the clean water storage well. The purified water can be repeatedly used for irrigation of farmland and flushing of the microbial filtering layer in the overflow filtering dam, ensuring the normal function of the microbial filtering layer and realizing the recycling of water resources and reducing costs. The present application solves the problems of ecological system destruction caused by agricultural non-point source pollution and farmland yield reduction caused by extreme weather. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein the same reference numerals refer to the same or similar components throughout several instances. In the drawings:

[0024] Figure 1 FIG. 1 is a schematic diagram of a farmland water purification and recycling system according to the present application;

[0025] Figure 2 FIG. 2 is a schematic diagram showing the arrangement relationship between the overflow filtering dam, the soil filtering system and the clean water storage system in the farmland water purification and recycling system according to the present application;

[0026] Figure 3 FIG. 3 is a structural schematic diagram of the overflow filtering dam in the farmland water purification and recycling system according to the present application;

[0027] Figure 4 FIG. 4 is a layout schematic diagram of the overflow filtering dam in the farmland water purification and recycling system according to the present application;

[0028] Figure 5 FIG. 5 is a structural schematic diagram of the filtering layer of the overflow filtering dam;

[0029] Figure 6 Structure diagram of the installation frame on the overflow filter dam.

[0030] Explanation of reference signs:

[0031] 1, farmland drainage ditch; 2, overflow filter dam; 21, dam body; 211, tooth wall; 212, overflow groove; 22, filter layer; 221, large grid layer; 222, small grid layer; 223, sponge layer; 224, aerobic microbial layer; 225, facultative anaerobic microbial layer; 226, fixed layer; 23, water replenishing hole; 24, water outlet hole; 25, installation frame; 251, installation plate; 252, limiting vertical plate; 253, support plate; 254, plug-in plate; 255, reinforcing rod; 3, soil filter system; 31, coarse-grained gravel layer; 32, fine-grained gravel layer; 33, soil layer; 4, clean water collection pipe; 41, water body collection hole; 5, clean water storage well; 6, irrigation well; 7, first water replenishing pump; 8, water replenishing main pipe; 9, water replenishing branch pipe; 10, overflow pipe; 11, irrigation water pumping pump; 12, clean water pumping pump; 13, clean water pumping pipe; 14, second water replenishing pump; 15, irrigation water pumping pipe; 16, second water replenishing pipe. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Those skilled in the art should know that the embodiments described below are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0033] After introducing the basic principles of the present application, various non-limiting embodiments of the present application will be specifically introduced below. Any number of elements in the drawings is used for example and is not limited, and any naming is only used for distinction and does not have any limiting meaning.

[0034] The principles and spirits of the present application will be explained in detail below with reference to several representative embodiments of the present application.

[0035] Embodiment 1 of the farmland water purification and reuse system provided by the present application:

[0036] As shown in Figure 1 and Figure 2 , the farmland water purification and reuse system comprises an overflow filter dam 2, a soil filter system 3, a clean water storage system, and a clean water reuse system, the clean water reuse system being connected with the clean water storage system, the overflow filter dam 2, and corresponding farmland irrigation equipment.

[0037] Specifically, as shown in Figure 4 , the overflow filter dam 2 comprises a dam body 21, a filter layer 22, a water replenishing hole 23, and a water outlet hole 24.As shown, the overflow filter dam 2 is fixed in the farmland drainage ditch 1, and multiple dams are arranged parallel to each other at intervals along the water flow direction. In this embodiment, as... Figure 3 As shown, each overflow filter dam 2 includes a dam body 21 and a filter layer 22 connected to the bottom of the dam body 21. The dam body 21 has a toothed structure and is welded from multiple steel plates. The top of the dam body 21 has multiple toothed walls 211 spaced apart along its length, forming an overflow channel 212 between adjacent toothed walls 211. The interior of the dam body 21 is hollow and can store water. The sides of the dam body 21 have water inlet holes 23 communicating with the interior space, and the bottom of the dam body 21 has water outlet holes 24 communicating with the interior space. Figure 5 As shown, the filter layer 22 includes a large grid layer 221, a small grid layer 222, a microbial filter layer, and a fixing layer 226 arranged sequentially from front to back along the water flow direction. The large grid layer 221 can isolate larger debris, such as dead branches and leaves, plastic bags, etc.; the small grid layer 222 can filter small floating debris; the microbial filter layer is located below the water outlet 24, through which water entering the dam body 21 from the water inlet 23 can flow into the microbial filter layer. Each layer can be connected to the corresponding fixing structure on the slope by snap-fit. The microbial filter layer mainly consists of three parts, namely, a sponge layer 223, an aerobic microbial layer 224, and a facultative anaerobic microbial layer 225 arranged sequentially from top to bottom. The main function of the sponge layer 223 is to ensure that the lower layer is kept moist; the aerobic microbial layer 224 is mainly composed of aerobic microbial membranes; the facultative anaerobic microbial layer 225 contains abundant facultative anaerobic microorganisms. The fixing layer 226 has a hollow structure, which can effectively drain water and fix the microbial filter layer, preventing the microbial filter layer from being washed away by the water flow.

[0038] The filter layer 22 is fixed in a steel mounting frame 25, such as... Figure 6As shown, the mounting frame 25 adopts a steel structure, including two mounting plates 251 arranged in parallel and spaced apart along the length direction of the dam body 21, and a pair of limiting vertical plates 252 connected to the opposite planes of the two mounting plates 251 respectively, a support plate 253 connected to the bottom of the two limiting vertical plates 252, and a clamping groove formed between the two limiting vertical plates 252, the support plate 253 and the corresponding mounting plate 251. The large grid layer 221, the small grid layer 222, the microbial filter layer and the fixing layer 226 are inserted into the clamping groove from top to bottom for fixation. The top of the mounting plate 251 is provided with a plug plate 254, the bottom of the dam body 21 is provided with a plug groove which is in up-down direction plug-in cooperation with the plug plate 254, and the water outlet hole 24 is located at the position between the two plug grooves. The two mounting plates 251 are further connected with a reinforcing rod 255. During installation, after the mounting frame 25 is fixed in the farmland drainage ditch 1, the large grid layer 221, the small grid layer 222, the microbial filter layer and the fixing layer 226 are inserted into the clamping groove from top to bottom for fixation; then the plug groove on the dam body 21 is inserted into the plug plate 254, and the dam body 2 is fixed with the slopes on both sides of the farmland drainage ditch 1.

[0039] The soil filter system 3 is arranged below the filter layer 22, and is used for secondary filtering of the water filtered by the overflow filter dam 2 at least once. In the embodiment, the soil filter system 3 includes a coarse-grained gravel layer 31, a fine-grained gravel layer 32 and a soil layer 33 arranged in sequence from top to bottom, the thickness of the coarse-grained gravel layer 31 ranges from 5cm to 10cm, the thickness of the fine-grained gravel layer 32 ranges from 5cm to 10cm, and the thickness of the soil layer 33 ranges from 10cm to 15cm.

[0040] The clean water storage system is mainly used for collecting and storing the water filtered by the soil filter system 3, and includes a clean water collecting pipe 4 and a clean water storage well 5. The clean water collecting pipe 4 extends along the arrangement direction of the overflow filter dam 2, and is arranged in multiple in the length direction of the dam body 21, each clean water collecting pipe 4 is connected with the same clean water storage well 5; the clean water collecting pipe 4 is provided with multiple water body collecting holes 41, the clean water collecting pipe 4 is located below the soil layer 33, and the water body is collected by the clean water collecting pipe 4 after being filtered by the overflow filter dam 2 and the soil filter system 3, and then flows into the clean water storage well 5.

[0041] In the embodiment, the clean water recycling system includes a first water supplementing pump 7 arranged in the clean water storage well 5, and the first water supplementing pump 7 is connected with the water supplementing hole 23 on the corresponding dam body 21 through a first water supplementing pipe. The first water supplementing pump 7 is provided with one, the first water supplementing pipe includes a water supplementing main pipe 8 and a water supplementing branch pipe 9 connected to the water supplementing main pipe 8, the water supplementing branch pipe 9 corresponds to the dam body 21 and is connected with the water supplementing hole 23 on the dam body 21, and one first water supplementing pump 7 is used to supplement water for each dam body 21, thereby saving cost.

[0042] The water purification and recycling system further comprises an irrigation well 6, which is arranged at intervals with the clean water storage well 5 and connected through an overflow pipe 10 located at a position close to the top of the clean water storage well 5. When the clean water storage well 5 stores a large amount of water, the excess water in the clean water storage well 5 flows into the irrigation well 6 through the clean water overflow pipe 10 when the water level reaches the height of the overflow pipe 10, so as to realize efficient recycling of water resources. The irrigation well 6 is provided with an irrigation water pump 11, and the irrigation water pump 11 is connected with an irrigation water pumping pipe 15 used for being connected with farmland irrigation equipment. The water stored in the irrigation well 6 can be pumped into farmland through the irrigation water pump 11 to irrigate the farmland.

[0043] The clean water storage well 5 is provided with a clean water pumping pump 12, and the clean water pumping pump 12 is connected with the irrigation water pump 11 through a clean water pumping pipe 13. Every certain time, the clean water pumping pump 12 pumps the water in the clean water storage well 5 into the irrigation water pump 11 to realize backwashing of the irrigation water pump 11 and prevent the irrigation water pump 11 from being blocked due to long-time use.

[0044] The irrigation well 6 is further provided with a second water supplementing pump 14, and the second water supplementing pump 14 is connected with a second water supplementing pipe 16 in communication with the clean water storage well 5. The second water supplementing pipe 16 is located below the overflow pipe 10. When the drought weather lasts for a long time, the second water supplementing pump 14 is opened at regular intervals to supplement the clean water storage well 5 with water.

[0045] Working mechanism of the present application:

[0046] When the farmland is irrigated or the precipitation is too much, the excess water flows into the farmland drainage ditch 1 through the farmland drainage system. The water flowing into the farmland drainage ditch 1 may contain residual pesticides, fertilizers and other pollutants that can cause environmental pollution. When the water flow is large, the water can directly flow out from the overflow groove 212 of the overflow filter dam 2 and will not be blocked due to the setting of the overflow filter dam 2. Because the water flow is large, the residual pesticides and fertilizers in the water body have a relatively low concentration, and the microorganisms contained in the microbial filter layer can also supplement the water body with microorganisms that can effectively decompose pollutants, so as to achieve the purpose of pollution prevention and control. When the water flow of the farmland drainage ditch 1 is small, the water body flows out through the filter layer 22 of the overflow filter dam 2. The filter layer 22 comprises a large grid layer 221, a small grid layer 222 and a microbial filter layer, which can effectively filter floating garbage and various pollutants in the water body. After multiple filtering, the water flowing from the farmland drainage ditch into the river, lake or sea has a high degree of cleanliness and will not affect the environment.

[0047] The water filtered by the overflow filter dam 2 at least once can permeate into the ground, be collected by the clean water collecting pipe 4 and flow into the clean water storage well 5. The water in the clean water storage well 5 can be used to supplement water in the dam body 21 by the first water supplementing pump 7. The water entering from the water supplementing hole 23 of the dam body 21 can flow into the microbial filter layer directly through the water outlet hole 24. Since the water pumped out has a certain water pressure, it can be used to flush the microbial filter layer, thereby fully guaranteeing the activity of the microorganisms. The sponge layer 223 can store water to supplement the aerobic microbial layer 224 and the facultative anaerobic microbial layer 225. The water in the clean water storage well 5 can also be used for irrigation of farmland.

[0048] The overflow filter dam 2 with the functions of flood discharge and purification can effectively purify the water body, so that the purpose of environmental pollution prevention and control can be achieved. The collected clean water can be used to flush the filter layer 22 and the irrigation pump and for irrigation of farmland, so that the purpose of improving the utilization efficiency of water resources can be achieved, the service life of the related equipment can be prolonged, the use cost can be reduced, and the environmental pollution caused by extreme bad weather, misuse of fertilizers and pesticides and the like can be effectively prevented.

[0049] Embodiment 2 of the farmland water purification and reuse system provided by the application:

[0050] The difference between the embodiment 1 and the embodiment 2 mainly lies in that in the embodiment 1, one clean water storage well is used to collect the water filtered at various positions, and at this time, various water supplementing branch pipes are needed to supplement water to the dam bodies. In the embodiment, a clean water storage well is arranged corresponding to each overflow filter dam, and at this time, each clean water storage well is connected with the water supplementing hole on the corresponding dam body through one water supplementing pipe.

[0051] According to the above description of the present specification, those skilled in the art can also understand that the terms used such as "upper", "lower", "front", "rear", "length", "top", "bottom", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, and are only for the purpose of facilitating the description of the scheme of the present application and simplifying the description, and do not mean or imply that the devices or elements involved must have the described specific orientation, be constructed and operated in a specific orientation, so the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the scheme of the present application.

[0052] In addition, in the description of the present specification, "a plurality of" means at least two, such as two, three or more, unless otherwise explicitly and specifically limited.

Claims

1. A system for purifying and reusing water for agricultural fields, characterized by, The overflow filter dam, the soil filter system, the clean water storage system and the clean water recycling system are included. The overflow filter dam is fixed in the farmland drainage ditch and is arranged in parallel and at intervals along the water flow direction. The soil filter system is arranged below the overflow filter dam and is used for filtering the water filtered by the overflow filter dam at least once. The clean water storage system is used for collecting and storing the water filtered by the soil filter system. The clean water recycling system is connected with the clean water storage system, the overflow filter dam and the corresponding farmland irrigation equipment to irrigate the farmland and flush the filter structure in the overflow filter dam by using the stored clean water. The overflow filter dam includes a dam body and a filter layer connected to the bottom of the dam body. The dam body is hollow, and the dam body is provided with a water supplement hole and a water outlet hole in communication with the internal space of the dam body.

2. The system for purifying and reusing water in farmlands according to claim 1, characterized by, The filter layer includes a grid layer, a microbial filter layer and a fixed layer arranged in sequence from front to back along the water flow direction.

3. The system for purifying and reusing water in farmlands according to claim 1, characterized by, The water supplement hole is connected with the clean water recycling system.

4. The system for purifying and reusing water in farmlands according to any one of claims 1 to 3, characterized by, The microbial filter layer includes a sponge layer, an aerobic microbial layer and a facultative anaerobic microbial layer arranged in sequence from top to bottom.

5. The system for purifying and reusing water in farmlands according to claim 4, wherein The dam body is a tooth-shaped structure, and the top of the dam body has a plurality of tooth walls arranged at intervals along the length direction of the dam body.

6. The system for purifying and reusing water in farmlands according to claim 4, wherein The clean water storage system includes a clean water collection pipe and a clean water storage well.

7. The system for purifying and reusing water in farmlands according to claim 6, characterized by, The clean water recycling system includes a first water supplement pump arranged in the clean water storage well.

8. The system for purifying and reusing water in farmlands according to claim 6, wherein The first water supplement pump is connected with the water supplement hole on the corresponding dam body through a first water supplement pipe.

9. The system for purifying and reusing water in farmlands according to any one of claims 1 to 3, characterized by, The clean water recycling system further includes an irrigation well connected with the clean water storage well through an overflow pipe. The clean water recycling system further includes an irrigation well connected with the clean water storage well through an overflow pipe. The clean water recycling system further includes an irrigation well connected with the clean water storage well through an overflow pipe. The soil filter system includes a coarse-grained gravel layer, a fine-grained gravel layer and a soil layer arranged in sequence from top to bottom. The coarse-grained gravel layer has a thickness ranging from 5 to 10 cm. The fine-grained gravel layer has a thickness ranging from 5 to 10 cm. The soil layer has a thickness ranging from 10 to 15 cm.

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