Farmland non-point source sewage net point interception type inverted siphon plant purification pond

Abstract

The invention belongs to the technical field of farmland non-point source pollution treatment, and particularly relates to a farmland non-point source sewage network interception type inverted siphon plant purification pond which comprises a hardened layer arranged on a ditch, and the hardened layer at least covers the ditch wall of the ditch; a plurality of communicated reinforced concrete culvert pipes are arranged in the extending direction of the ditch, and the reinforced concrete culvert pipes make contact with the hardened layer in a non-planar mode; the longitudinal water-passing section size of the ditch is S1, the longitudinal water-passing section size of the reinforced concrete culvert pipe is S2, and S2 = (0.75-0.85) * S1; a soil layer used for being filled with soil and a water body layer used for aquatic plant breeding are arranged on the top face of the reinforced concrete culvert pipe in advance. Therefore, farmland non-point source pollution can be effectively treated, meanwhile, cultivated land protection, water delivery efficiency and healthy development of an ecological system are considered, and therefore a more sustainable rural water environment management system is constructed.

Description

Technical Field

[0001] The invention belongs to the technical field of farmland non-point source pollution control in water conservancy project construction, and specifically relates to a farmland non-point source sewage network point interception type inverted siphon plant purification pool. Background Art

[0002] At present, the treatment of agricultural non-point source sewage mainly adopts measures such as ecological ponds, wetlands and ecological porous brick ditch wall plants. However, these methods have some significant problems: 1. The construction of ecological ponds and wetlands requires a large amount of arable land, which is a heavy burden for the already limited land resources; 2. Although the planting of ditch wall plants helps to purify the water quality, in the midsummer season, the lush growth of plants will seriously affect the water conveyance capacity of the ditch, especially in the period of large and frequent water conveyance; 3. Weeds and other aquatic plants grow rapidly in summer, resulting in a large amount of manpower and material resources for cleaning. Due to the wide range of areas involved, the cleaning work is difficult and it is easy to be untimely; 4. The rot of plant stems and leaves that are not cleaned in time will cause secondary pollution and further deteriorate the water quality; 5. If the ditch walls are all hardened, although the water conveyance efficiency can be improved, it will destroy the original growth environment of aquatic plants and animals, which is not conducive to the health of the ecosystem.

[0003] In response to the above problems, a more reasonable technical solution is needed to effectively control farmland non-point source pollution while taking into account farmland protection, water delivery efficiency and the healthy development of the ecosystem, so as to build a more sustainable rural water environment management system. Summary of the invention

[0004] The purpose of the present invention is to provide an intercepting inverted siphon plant purification pool for farmland non-point source sewage network points, so as to effectively control farmland non-point source pollution while taking into account farmland protection, water delivery efficiency and the healthy development of the ecosystem, thereby constructing a more sustainable rural water environment management system.

[0005] In order to achieve the above-mentioned object, the present invention provides an interception type inverted siphon plant purification pool for farmland non-point source sewage network points, comprising a hardened layer arranged on a ditch, the hardened layer at least covering the ditch wall of the ditch; a plurality of interconnected reinforced concrete culverts are arranged along the extension direction in the ditch, and the reinforced concrete culverts are in contact with the hardened layer in a non-planar form;

[0006] The longitudinal water-passing cross-sectional dimension of the ditch is S1, and the longitudinal water-passing cross-sectional dimension of the reinforced concrete culvert is S2, wherein S2=(0.75-0.85)*S1; the top surface of the reinforced concrete culvert is preset with a soil layer for filling soil and a water layer for the reproduction of aquatic plants.

[0007] In a possible design, the hardened layer covers the ditch wall and ditch bottom, wherein the ditch has a small amount of water flowing all year round and is in a nearly dry state.

[0008] In a possible design, the ditch is provided with one or more rows of channels consisting of reinforced concrete culverts or rectangular or square reinforced concrete.

[0009] In one possible design, the spacing between adjacent reinforced concrete culverts is 1 to 3 cm.

[0010] In a possible design, the reinforced concrete culvert is provided with a plurality of holes arranged at intervals.

[0011] In a possible design, a grille is provided at the hole.

[0012] In a possible design, the grid is configured as a grid made of glass fiber material.

[0013] In one possible design, the spacing between adjacent holes is 8 to 12 cm.

[0014] In a possible design, the height of the soil layer and the water layer is 20 cm.

[0015] In a possible design, the height of the bottom of the ditch is higher than the height of the bottom wall of the reinforced concrete culvert so as to form a slope.

[0016] Through the above technical solution, after the polluted water flows into the ditch, it first passes through the ditch wall covered with a hardened layer, which reduces the growth of weeds and other plants and ensures the basic water transport capacity of the ditch. The water then flows into the reinforced concrete culvert. Since the inside of the culvert is smooth and free of debris, the water can pass smoothly, and the physical sedimentation of silt and large particles is initially achieved. The water flow treated by the culvert continues to rise to the soil layer and water layer on the top surface of the culvert. The water layer is planted with specific aquatic plants, which can not only absorb nutrients (such as nitrogen, phosphorus, etc.) in the water through their roots, but also promote the development of beneficial microbial communities and further degrade pollutants. The purified water re-enters the ditch to participate in the next round of irrigation or discharge, forming a virtuous cycle system.

[0017] The design of the hardened layer and reinforced concrete culvert effectively prevents the overgrowth of plants such as weeds, significantly improving the water delivery efficiency of the ditch, especially in the midsummer season, when other untreated ditches may be blocked by lush plants, the system can still maintain good water delivery performance. By rationally configuring aquatic plants and microbial communities, the system can greatly improve the natural purification capacity of polluted water bodies and reduce the pollution pressure of downstream water bodies without affecting the normal water delivery of the ditch. The soil layer and water layer on the top of the culvert provide a suitable living environment for aquatic plants and animals, maintain the ecological diversity of the farmland non-point source area, and promote the healthy and stable development of the entire ecosystem. The interior of the culvert is smooth and not easy to accumulate debris. In addition, the ecological restoration measures on the top reduce the need for regular cleaning, reduce the investment of manpower and material resources, and make long-term operation more economical and feasible. The purification pool is suitable for farmland non-point source sewage treatment under various terrain and climatic conditions, meets the relevant policy requirements on the prevention and control of agricultural non-point source pollution, has made positive contributions to improving the quality of the water environment, and helps promote the development of green agriculture. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0019] Figure 1 It is a schematic cross-sectional structural diagram of an interception-type inverted siphon plant purification pool for farmland non-point source sewage provided by the present invention in one embodiment;

[0020] Figure 2 It is a schematic cross-sectional structural diagram of another embodiment of the interception-type inverted siphon plant purification pool for farmland non-point source sewage provided by the present invention.

[0021] In the above drawings: 1- ditch, 11- ditch wall, 12- ditch bottom, 2- reinforced concrete culvert, 3- soil layer, 4- water layer, 5- aquatic plants. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that although the description of these embodiments is used to help understand the present invention, it does not constitute a limitation of the present invention. The specific structures and functional details disclosed herein are only used to describe the embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

[0023] According to the first aspect of the present invention, there is provided a farmland non-point source sewage interception type inverted siphon plant purification pool. Figure 1 and Figure 2 One specific embodiment is shown.

[0024] See also Figure 1 and Figure 2 As shown, the interception type inverted siphon plant purification pool for farmland non-point source sewage network point includes a hardened layer arranged on the ditch 1, and the hardened layer at least covers the ditch wall 11 of the ditch 1. The hardened layer is a cement or concrete layer. Such an arrangement can prevent excessive growth of plants such as weeds and ensure the water delivery efficiency of the ditch 1 on the one hand, and can avoid collapse to a certain extent on the other hand. A plurality of interconnected reinforced concrete culverts 2 are arranged along the extension direction in the ditch 1, and the reinforced concrete culvert 2 is in contact with the hardened layer in a non-planar form, thereby reserving space for water circulation and avoiding structural mutual influence. The longitudinal water-passing section size of the ditch 1 is S1, and the longitudinal water-passing section size of the reinforced concrete culvert 2 is S2, wherein S2 = (0.75-0.85) * S1, thereby ensuring that the culvert can carry enough water and leave enough space for natural purification. The top surface of the reinforced concrete culvert 2 is preset with a soil layer 3 for filling soil and a water layer 4 for the reproduction of aquatic plants 5. The former is used to fill the soil, while the latter provides an environment for the reproduction of aquatic plants 5, forming a small ecosystem.

[0025] Through the above technical solution, after the polluted water flows into the ditch 1, it first passes through the ditch wall 11 covered with a hardened layer, which reduces the growth of weeds and other plants and ensures the basic water transport capacity of the ditch 1. The water then flows into the reinforced concrete culvert 2. Since the inside of the culvert is smooth and free of debris, the water can pass smoothly, and the physical sedimentation of silt and large particles is initially achieved. The water flow after the culvert treatment continues to rise to the soil layer 3 and the water layer 4 on the top surface of the culvert. The water layer 4 is planted with specific aquatic plants 5, which can not only absorb nutrients (such as nitrogen, phosphorus, etc.) in the water through the root system, but also promote the development of beneficial microbial communities and further degrade pollutants. The purified water re-enters the ditch 1 to participate in the next round of irrigation or discharge, forming a virtuous cycle system.

[0026] The design of the hardened layer and reinforced concrete culvert 2 effectively prevents the excessive growth of plants such as weeds, significantly improves the water delivery efficiency of the ditch 1, especially in the midsummer season, when other untreated ditches 1 may be blocked due to lush plants, the system can still maintain good water delivery performance. By rationally configuring aquatic plants 5 and microbial communities, the system can greatly improve the natural purification capacity of polluted water bodies without affecting the normal water delivery of the ditch 1, and reduce the pollution pressure of downstream water bodies. The soil layer 3 and water layer 4 on the top of the culvert provide a suitable living environment for aquatic plants and animals, maintain the ecological diversity of the farmland non-point source area, and promote the healthy and stable development of the entire ecosystem. The interior of the culvert is smooth and not easy to accumulate debris. In addition, the ecological restoration measures on the top reduce the need for regular cleaning, reduce the investment of manpower and material resources, and make long-term operation more economical and feasible. The purification pool is suitable for farmland non-point source sewage treatment under various terrain and climatic conditions, meets the relevant policy requirements on the prevention and control of agricultural non-point source pollution, makes a positive contribution to improving the quality of the water environment, and helps promote the development of green agriculture.

[0027] In one embodiment provided by the present disclosure, the hardened layer covers the ditch wall 11 and the ditch bottom 12 of the ditch 1, wherein the ditch 1 is a nearly dry state with a small amount of water flowing all year round. The design of the hardened layer fully covering the ditch wall 11 and the ditch bottom 12 effectively prevents the excessive growth of plants such as weeds, and significantly improves the water delivery efficiency of the ditch 1. In particular, it is carried out in a dry canal, which is beneficial to ensure the quality and flatness of the hardened layer, so that the ditch 1 can maintain unimpeded and smooth water delivery regardless of the climatic conditions, lay a good foundation for ecological restoration work, ensure the stability and reliability of the system, and ensure long-term and effective sewage treatment effects.

[0028] It should be noted that the ditch is in a semi-dry state, which means that only a small amount of water flows in the ditch all year round and it is almost dry.

[0029] In the present disclosure, at least two rows of channels consisting of reinforced concrete culverts 2 are provided in the ditch 1, so as to adapt to a wider channel.

[0030] In an embodiment provided by the present disclosure, the spacing between adjacent reinforced concrete culverts 2 is 1 to 3 cm, so that the fine roots of aquatic plants 5 can penetrate deep into the culvert, which not only enhances the physical filtering effect of the plant roots, but also promotes the development of microbial communities. The plant roots absorb nutrients (such as nitrogen, phosphorus, etc.) in the water, and further degrade pollutants through the action of microorganisms, significantly improving the sewage purification efficiency.

[0031] In one embodiment, it is characterized in that a plurality of holes are arranged at intervals on the reinforced concrete culvert 2, so that the fine roots of the aquatic plants 5 can penetrate into the culvert, enhancing the physical filtering effect of the plant roots. At the same time, the presence of the holes makes it easier for the roots of the aquatic plants 5 to penetrate the culvert wall, increasing the contact area between the roots and the sewage, thereby improving the adsorption and degradation efficiency of pollutants. The purified water body re-enters the ditch 1 to participate in the next round of irrigation or discharge, forming a virtuous cycle system.

[0032] Furthermore, grilles are provided at the holes to prevent soil loss from the holes and gaps of the culvert, which is beneficial to protecting the integrity of the culvert structure and ensuring the long-term stable operation of the system.

[0033] Furthermore, the grille is configured as a grille made of fiberglass material, which has the characteristics of high strength, corrosion resistance, and light weight, and can effectively support and protect the culvert and aquatic plants 5 without having a negative impact on water quality.

[0034] In the present disclosure, the spacing between adjacent holes is 8 to 12 cm, ensuring that there is enough space for the roots of the aquatic plants 5 to fully develop, while also avoiding the reduction of structural strength due to overly dense holes. Furthermore, the grid is configured as a grid made of fiberglass material, which has the characteristics of high strength, corrosion resistance, and light weight, and can effectively support and protect the culvert and the aquatic plants 5, while not having a negative impact on the water quality.

[0035] In one embodiment provided in the present disclosure, the height of the soil layer 3 and the water layer 4 is 20 cm.

[0036] In the present disclosure, the height of the bottom of the ditch 1 is higher than the height of the bottom wall of the reinforced concrete culvert 2, so as to form a slope. It should be explained that the slope means: the bottom of the ditch 1 has a relative height difference with respect to the bottom wall of the reinforced concrete culvert 2; and the bottom of the ditch 1 has a slope ratio of 1:2 with respect to the bottom wall of the reinforced concrete culvert 2, and the foundation of the reinforced concrete culvert 2 should be stable to ensure that the reinforced concrete culvert is on the same horizontal line.

[0037] A preferred embodiment will be provided below.

[0038] The water-passing section of the ditch 1 wall where water accumulates deep (about 1 meter) all year round is fully hardened (hardening is not allowed at the culvert), and only a small amount of water flows in ditch 1 all year round. For the nearly dry ditch 1, the ditch bottom and ditch 1 wall are fully hardened, so that the water flow in ditch 1 is always unobstructed and smooth.

[0039] In order to meet the ecological environment needs of the non-point source water in farmland and the growth of plants, intercepting inverted siphon plant purification pools are set up in all ditches 1 that transport water to farmland at segmented points.

[0040] Specific contents of the structure and setting of the inverted siphon plant purification pool:

[0041] 1. Density: Considering the different degrees of non-point source pollution in local farmland, it generally accounts for about 20% of the ditch area.

[0042] 2. The water-passing section is about 80% of the water-passing section of ditch 1.

[0043] 3. The top elevation of the culvert is divided into two types: higher than the bottom of the ditch and lower than the bottom of the ditch: (1) higher than the bottom of the ditch is suitable for ditches with long-term water accumulation 1; (2) lower than the bottom of the ditch is suitable for ditches with a small amount of water flowing all year round and almost dry 1. Both methods must ensure that under normal circumstances, the top of the culvert always has a 20 cm soil layer 3 and a 20 cm water layer 4 (to ensure the survival of aquatic animals and plants).

[0044] 4. The inlet and outlet of the culvert are set along the slope with a slope ratio of about 1:2.

[0045] 5. Culverts are generally made of reinforced concrete pipes (wider channels can have more than two pipes arranged in an arrangement, or they can be rectangular or square).

[0046] 6. The length of the inverted siphon plant purification pool is generally about 6 meters, and the length of each pipe section is generally about 60 centimeters.

[0047] 7. Reserve holes with a diameter of about 2 cm around the pipes (density of about 10 cm), and connect the pipes with a gap of about 2 cm between them (to provide aquatic plants with 5 small roots to penetrate deep into the culvert to purify sewage).

[0048] 8. Lay a fiberglass grid with a hole diameter less than 1 cm on the upper half of the pipeline (to prevent soil loss from the holes and gaps in the pipeline).

[0049] 9. A simple pedestrian passage and agricultural machinery passage can also be set up in the middle of the inverted siphon plant purification pool (they should meet the load-bearing design and be connected by pipes to meet the flow of water on the surface of the culvert). Figure 1 As shown in the figure.

[0050] It should be noted that due to different conditions in different places, the varieties of aquatic plants 5 also vary. It is necessary to plant varieties that have strong purification capabilities and high recycling values ​​in different seasons, which will help reduce the cost of cleaning up dead branches, stems and leaves of plants.

[0051] The technical improvements of the present invention have the following beneficial effects compared with the prior art:

[0052] 1. By setting up a large number of intercepting inverted siphon plant purification pools in the wide farmland surface source, the present invention significantly enhances the sewage purification capacity, reduces the dependence on traditional ecological wetlands and ponds, and can even completely eliminate these facilities in some cases, thereby effectively saving precious arable land resources.

[0053] 2. It is beneficial to prevent weeds from growing in the farmland ditch 1. Only dead branches, stems and leaves exist in the inverted siphon plant purification pool. These dead branches, stems and leaves are easy to clean, which greatly saves manpower and material resources. It also prevents the phenomenon of water pollution caused by rotting weeds in the ditch 1, thereby improving the overall water environment quality.

[0054] 3. By optimizing the structure and water flow path of the ditch 1, the present invention maximizes the water delivery function of the ditch 1. Especially during the critical period of flood control and drought relief every year, the water in the ditch 1 can flow unimpeded, effectively reducing the frequency and degree of drought and flood disasters. For farmland in the polder area, timely draining the bottom water in the polder before the arrival of heavy rain is conducive to the full-load operation of drainage machinery and equipment, generating significant economic and social benefits.

[0055] 4. The water body is always in a state of continuous purification by aquatic plants 5, which ensures the stability of water quality and meets the requirements of standard discharge. It avoids the situation where some rivers, lakes and reservoirs are forced to restrict the discharge of sewage within the dike in order to meet water quality standards, prevents crops within the dike from being damaged by flooding, further ensures the stability and safety of agricultural production, and brings huge economic and social benefits.

[0056] 5. The present invention realizes the local purification and treatment of wastewater such as fertilizer and pesticide residues in various regions, which is suitable for the current needs of high-standard farmland construction and water environment management projects in major rivers, lakes and basins, and has broad promotion value and application prospects.

[0057] Finally, it should be noted that the present invention is not limited to the above optional implementations, and anyone can derive other various forms of products under the enlightenment of the present invention. The above specific implementations should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention should be based on the definition in the claims, and the description can be used to interpret the claims.

Claims

1. An interception type inverted siphon plant purification pool for farmland non-point source sewage, characterized in that it comprises a hardened layer arranged on a ditch, the hardened layer at least covers the ditch wall of the ditch; a plurality of interconnected reinforced concrete culverts are arranged along the extension direction in the ditch, and the reinforced concrete culverts are in contact with the hardened layer in a non-planar form; The longitudinal water-passing section size of the ditch is S1, and the longitudinal water-passing section size of the reinforced concrete culvert is S2, wherein: S2 = (0.75-0.85) * S1; The top surface of the reinforced concrete culvert is preset with a soil layer for filling soil and a water layer for the reproduction of aquatic plants.

2. The interception type inverted siphon plant purification pool for farmland non-point source sewage according to claim 1 is characterized in that: The hardened layer covers the ditch wall and ditch bottom, wherein the ditch is in a semi-dry state.

3. The interception type inverted siphon plant purification pool for farmland non-point source sewage according to claim 1 is characterized in that: The ditch is provided with one or more than two rows of channels consisting of reinforced concrete culverts or rectangular or square reinforced concrete.

4. The interception type inverted siphon plant purification pool for farmland non-point source sewage according to claim 1 is characterized in that: The spacing between adjacent reinforced concrete culverts is 1 to 3 cm.

5. The interception type inverted siphon plant purification pool for farmland non-point source sewage network point according to claim 1 is characterized in that: The reinforced concrete culvert is provided with a plurality of holes arranged at intervals.

6. The interception type inverted siphon plant purification pool for farmland non-point source sewage according to claim 5 is characterized in that: A grille is provided at the hole.

7. The interception type inverted siphon plant purification pool for farmland non-point source sewage according to claim 6 is characterized in that: The grid is configured as a grid made of glass fiber material.

8. The interception type inverted siphon plant purification pool for farmland non-point source sewage network point according to claim 5 is characterized in that: The distance between adjacent holes is 8 to 12 cm.

9. The interception type inverted siphon plant purification pool for farmland non-point source sewage according to claim 1, characterized in that: The height of the soil layer and the water layer is 20 cm.

10. The interception type inverted siphon plant purification pool for farmland non-point source sewage according to claim 1, characterized in that: The height of the ditch bottom is higher than the bottom wall of the reinforced concrete culvert so as to form a slope connection at a slope ratio of 1:2.

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