Purification ditch suitable for river-entering farmland

Abstract

The utility model discloses a purification ditch suitable for a river-entering farmland. The purification ditch comprises a ditch main body, a physical purification module and a biological purification module, three partition wall bodies which are arranged at intervals are arranged in the ditch main body, and the inner area of the ditch main body is sequentially divided into a water inlet tank, a physical purification tank, a biological purification tank and a water outlet tank. And each partition wall body is provided with an overflowing channel. The physical purification module and the biological purification module are respectively arranged in the physical purification tank and the biological purification tank. According to the utility model, the ceramsite layer and the filler layer which are stacked from bottom to top are arranged in the physical purification tank. Meanwhile, the floating bed main body and the aquatic plants are arranged in the biological purification tank, so that the flowing water output from the riverway is purified for multiple times, and the problem of low purification rate due to short retention time of the treated sewage in the purification system is effectively avoided.

Description

Technical Field

[0001] This utility model belongs to the field of ecological ditch purification technology, specifically relating to a purification ditch suitable for farmland flowing into rivers. Background Technology

[0002] Agricultural non-point source pollution refers to the process by which dissolved or solid pollutants, generated during agricultural production and daily life activities, enter receiving water bodies from unspecified locations through surface runoff, farmland drainage, and groundwater infiltration, causing water pollution. The main sources of agricultural non-point source pollution include the runoff of chemical fertilizers and pesticides, livestock and aquaculture, and the discharge of rural domestic runoff and decentralized domestic sewage. For rivers and lakes surrounded by farmland, agricultural non-point source pollution has become a typical pollutant. Current technologies for controlling agricultural non-point source pollution mainly include ecological ponds and intercepting ditches.

[0003] Chinese Patent Publication No. CN221441444U discloses a riverbed buffer zone for controlling farmland drainage. This utility model adopts the following technical solution: it includes a drainage canal, an ecological ditch, and a drainage purification pond. The drainage canal is located around the farmland and connected to the ecological ditch. The ecological ditch is connected to the drainage purification pond, and the outlet of the drainage purification pond is connected to the river. Several ecological filter dams are installed within the ecological ditch.

[0004] The aforementioned patent describes a method of diverting farmland runoff into ecological ditches using drainage channels. Different materials and types of functional plants are then used in both the drainage and ecological ditches to absorb and purify residual fertilizer pollutants in the runoff. However, a simple ecological ditch system is insufficient to meet the goal of reducing pollutant loads entering rivers. During the rainy season or periods of concentrated irrigation and drainage, the treated wastewater has a short residence time in the purification system, resulting in low purification rates. Furthermore, over long-term treatment, the gradual sedimentation of pollutants reduces the overall purification effect. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides a purification ditch suitable for farmland flowing into rivers, in order to solve the technical problems of the single purification effect of ecological ditches and the low purification rate of water flowing out of farmland during the rainy season.

[0006] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0007] A purification ditch suitable for farmland flowing into rivers includes a ditch body, a physical purification module, and a biological purification module. The ditch body contains three spaced-apart partition walls, sequentially dividing the internal area into an inlet channel, a physical purification channel, a biological purification channel, and an outlet channel. Each partition wall has a flow passage. The physical purification module and the biological purification module are respectively housed within the physical purification channel and the biological purification channel.

[0008] The physical purification module includes a layer of expanded clay aggregate and a layer of filler aggregate stacked from bottom to top. The filler aggregate is made of a mixture of wood blocks and wood chips.

[0009] The biological purification module includes a floating bed body and aquatic plants.

[0010] Furthermore, the flow channels on the three partition walls are staggered. The flow channels on the partition walls adjacent to the inlet and outlet tanks are located at the top, while the flow channels on the partition walls between the physical purification tank and the biological purification tank are located at the bottom.

[0011] Furthermore, the ratio of the ceramsite layer to the filler layer is 1:5.

[0012] Furthermore, the top of the physical purification tank is equipped with a sealed wall. An observation port is provided on the sealed wall.

[0013] Furthermore, a 20cm reserved space is provided between the top of the filler layer and the sealing wall.

[0014] Furthermore, the side walls of the inlet tank and outlet tank are respectively provided with inlet and outlet. A flow guide is provided at the inlet. The flow guide has a funnel-shaped structure with a smaller inner diameter and a larger outer diameter.

[0015] Furthermore, the floating bed body includes a floating bed frame and a supporting net. The floating bed body is a frame structure formed by assembling multiple PVC water pipes. The supporting net is located in the inner circle of the floating bed body and is connected to the floating bed body at its edges. Aquatic plants are planted on the supporting net.

[0016] Furthermore, the aquatic plants used are Myriophyllum spicatum, Dracaena sanderiana, or water spinach.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This utility model achieves multiple purification treatments of the river water by setting up layers of expanded clay and filler in the physical purification tank from bottom to top. At the same time, a floating bed and aquatic plants are set up in the biological purification tank, which effectively avoids the problem of low purification rate due to the short residence time of the treated sewage in the purification system.

[0019] 2. In this invention, the flow channels on the three partition walls are staggered, so that when the wastewater to be treated enters the physical purification tank from the inlet tank, it will preferentially pass through the packing layer. Nitrogen and phosphorus elements in the wastewater can be initially absorbed by the wood blocks and sawdust in the packing layer. Simultaneously, the bottom layer of ceramsite increases the pore size of the packing material in the physical purification tank, ensuring that the wastewater to be treated can flow smoothly within the tank and preventing blockage caused by the adsorbents settling. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram showing the relative positions of the physical purification module and the biological purification module in this utility model;

[0022] Figure 3 This is a schematic diagram of the physical purification module and the biological purification module in this utility model. Figure 2 (Cross-sectional view along the AA direction).

[0023] Attached reference numerals: 1. Main body of the ditch; 2. Physical purification module; 2-1. Ceramsite layer; 2-2. Filler layer; 3. Biological purification module; 3-1. Main body of the floating bed; 3-2. Aquatic plants; 4. Separating wall; 5. Flow passage; 6. Covering wall; 7. Flow guide; 8. Observation port. Detailed Implementation

[0024] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1 and 2As shown, a purification ditch suitable for farmland flowing into rivers includes a ditch body 1, a physical purification module 2, and a biological purification module 3. The ditch body 1 contains three spaced-apart partition walls 4, sequentially dividing the internal area into an inlet tank, a physical purification tank, a biological purification tank, and an outlet tank. Each partition wall 4 has a flow passage 5 for sequentially connecting the inlet tank, the physical purification tank, the biological purification tank, and the outlet tank. The physical purification module 2 and the biological purification module 3 are respectively installed within the physical purification tank and the biological purification tank, used to sequentially perform physical and biological purification of the treated wastewater.

[0027] like Figure 1 As shown, inlet and outlet ports are respectively provided on the side walls of the inlet and outlet tanks. A guide component 7 is installed at the inlet. The guide component 7 has a funnel-shaped channel with a smaller inner diameter and a larger outer diameter, allowing the treated wastewater containing nitrogen and phosphorus elements, generated by heavy rain in the farmland, to flow into the inlet tank. A drainage channel is provided at the outlet. After the treated wastewater is purified by the physical purification module 2 and the biological purification module 3, it can be discharged from the outlet via overflow and then discharged into the river through the drainage channel.

[0028] like Figure 3 As shown, the physical purification module 2 includes a layer of expanded clay aggregate 2-1 and a packing layer 2-2 stacked from bottom to top. The packing layer 2-2 is made of a mixture of wood blocks and wood chips, which provides a sufficient carbon source during the physical purification process, thereby enhancing the ability to denitrify and degrade nitrogen pollution.

[0029] In this embodiment, the flow channels 5 on the three partition walls 4 are staggered. Specifically, the flow channels 5 on the partition walls 4 adjacent to the inlet and outlet tanks are located at the top, while the flow channels 5 on the partition wall 4 between the physical purification tank and the biological purification tank are located at the bottom. When the wastewater to be treated enters the physical purification tank from the inlet tank, it will preferentially pass through the packing layer 2-2, allowing the nitrogen and phosphorus elements in the wastewater to be initially absorbed by the wood blocks and sawdust in the packing layer 2-2. Simultaneously, the bottom layer of the ceramsite layer 2-1 increases the pore size of the packing material within the physical purification tank, ensuring that the wastewater to be treated can flow smoothly within the physical purification tank and preventing blockage after settling of the adsorbents.

[0030] In some embodiments, the thickness ratio of the ceramsite layer 2-1 to the filler layer 2-2 is 1:5.

[0031] like Figure 2 As shown, the top of the physical purification tank is equipped with a cover wall 6 to reduce the impact of external factors on the treated wastewater during the physical purification process. Two observation ports 8 are provided on the cover wall 6 for staff to sample and test the treated wastewater inside the physical purification tank.

[0032] Furthermore, a 20cm reserved space is provided between the top of the filler layer 2-2 and the sealing wall 6, so that when the treated sewage is guided into the physical purification tank, a 20cm free water layer will be formed at the top of the physical purification tank, which facilitates the collection of water samples by the staff.

[0033] like Figure 3 As shown, the biological purification module 3 includes a floating bed body 3-1 and aquatic plants 3-2. The floating bed body 3-1 includes a floating bed frame and a supporting net. The floating bed body 3-1 is a frame structure formed by assembling multiple PVC water pipes. The supporting net is located within the inner ring of the floating bed body 3-1 and is connected to the floating bed body 3-1 at its edges. The aquatic plants 3-2 are planted on the supporting net and are used to further purify the wastewater in the biological purification tank, allowing for the further absorption of nitrogen and phosphorus elements.

[0034] In this embodiment, the aquatic plant 3-2 is either Myriophyllum spicatum, Dracaena sanderiana, or water spinach. Different aquatic plants 3-2 are planted according to the season to reduce the limitations of treating wastewater caused by seasonal variations.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A purification ditch suitable for farmland flowing into rivers, characterized in that: The system includes a ditch body (1), a physical purification module (2), and a biological purification module (3); the ditch body is provided with three spaced partition walls (4), which divide the internal area of ​​the ditch body (1) into an inlet tank, a physical purification tank, a biological purification tank, and an outlet tank; each partition wall (4) has an overflow channel (5); the physical purification module (2) and the biological purification module (3) are respectively installed in the physical purification tank and the biological purification tank; The physical purification module (2) includes a layer of expanded clay (2-1) and a filler layer (2-2) stacked from bottom to top; the filler layer (2-2) is a filler made of a mixture of wood blocks and wood chips; the biological purification module (3) includes a floating bed body (3-1) and aquatic plants (3-2).

2. A purification ditch suitable for farmland flowing into rivers, as described in claim 1, characterized in that: The flow channels (5) on the three partition walls (4) are staggered; the flow channels (5) on the partition walls (4) located on the adjacent sides of the inlet tank and the outlet tank are located at the top, and the flow channels (5) on the partition walls (4) between the physical purification tank and the biological purification tank are located at the bottom.

3. A purification ditch suitable for farmland flowing into rivers, as described in claim 1, characterized in that: The thickness ratio of the ceramsite layer (2-1) to the filler layer (2-2) is 1:

5.

4. A purification ditch suitable for farmland flowing into rivers, as described in claim 1, characterized in that: The top of the physical purification tank is provided with a cover wall (6); an observation port (8) is provided on the cover wall (6).

5. A purification ditch suitable for farmland flowing into rivers, as described in claim 4, characterized in that: A 20cm reserved space is provided between the top of the filler layer (2-2) and the cover wall (6).

6. A purification ditch suitable for farmland flowing into rivers, as described in claim 1, characterized in that: The inlet and outlet of the water tank are respectively provided on the side walls; a guide (7) is provided at the inlet; the guide (7) is provided with a guide channel with a funnel-shaped structure that is smaller inside and larger outside.

7. A purification ditch suitable for farmland flowing into rivers according to claim 1, characterized in that: The main body of the floating bed (3-1) includes a floating bed frame and a supporting net; the main body of the floating bed (3-1) is a frame structure formed by combining multiple PVC water pipes; the supporting net is set in the inner circle of the main body of the floating bed (3-1) and its edge is connected to the main body of the floating bed (3-1); aquatic plants (3-2) are planted on the supporting net.

8. A purification ditch suitable for farmland flowing into rivers according to claim 1, characterized in that: The aquatic plants (3-2) used are Myriophyllum spicatum, Acer palmatum, or water spinach.

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