An in-situ purification device suitable for farmland effluent

Abstract

The application discloses an in-situ purification device suitable for farmland effluent, which comprises a stone cage purification structure capable of preliminarily purifying silt, nitrogen and phosphorus elements in farmland tail water from a farmland source, a water inlet end of the stone cage purification structure being communicated with the farmland tail water from the farmland source; a drainage ditch capable of draining the farmland tail water preliminarily purified by the stone cage purification structure into an ecological ditch for subsequent purification, a water inlet end of the drainage ditch being communicated with a water outlet end of the stone cage purification structure, and a water outlet end of the drainage ditch being communicated with the ecological ditch which needs to perform subsequent purification on the farmland tail water. The application has the advantages of simple overall construction, stable structure, low cost, effective purification of the farmland tail water from the source, improved purification effect of the farmland tail water and great convenience for complete purification of the farmland tail water.

Description

Technical Field

[0001] This invention relates to the field of agricultural wastewater treatment technology, and in particular to an in-situ purification device suitable for agricultural wastewater. Background Technology

[0002] Agricultural non-point source pollution refers to pollution caused by unabsorbed fertilizers from farmland and accumulated livestock manure from farms entering downstream water bodies via surface runoff caused by precipitation. The main pollutants are nitrogen and phosphorus. Excessive nitrogen and phosphorus levels can easily lead to eutrophication of water bodies and cause phenomena such as algal blooms.

[0003] One of the main methods for controlling agricultural non-point source pollution is to control the pollution at its source. Field drainage outlets, as the starting point of farmland drainage, carry the highest concentrations of nitrogen and phosphorus in the agricultural drainage system. Most of this consists of suspended solids composed of silt and fertilizer. Currently, the vast majority of field drainage outlets use a direct discharge method without any purification devices at the source. Subsequent purification relies solely on technologies such as ecological ditches and wetlands, failing to fully utilize the advantages of source purification. This reduces the effectiveness of farmland wastewater purification and significantly hinders the thorough purification of farmland wastewater. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides an in-situ purification device suitable for farmland effluent. This in-situ purification device is simple to construct, has a stable structure, and is low in cost. It can effectively purify farmland effluent from the source, effectively improving the purification effect of farmland effluent and bringing great convenience to the thorough purification of farmland effluent.

[0005] To solve the above technical problems, the present invention adopts the following technical solution:

[0006] An in-situ purification device suitable for farmland effluent, characterized in that it includes:

[0007] A gabion purification structure capable of preliminarily purifying the mud, sand, nitrogen, and phosphorus elements in the farmland tailwater at the source of farmland, wherein the inlet end of the gabion purification structure is connected to the farmland tailwater at the source of farmland.

[0008] A diversion ditch is provided that can divert farmland tailwater that has been initially purified by a gabion purification structure to an ecological ditch for further purification. The inlet of the diversion ditch is connected to the outlet of the gabion purification structure, and the outlet of the diversion ditch is connected to an ecological ditch that needs to further purify farmland tailwater.

[0009] In a preferred embodiment of the present invention, the gabion purification structure includes

[0010] A diversion pipe is used to divert farmland tailwater from the source of farmland into the diversion ditch. The outlet end of the diversion pipe is connected to the inlet end of the diversion ditch, and the inlet end of the diversion pipe is connected to the farmland tailwater from the source of farmland and is flush with the ground of the farmland.

[0011] A gabion purification body is used to preliminarily purify the mud, sand, nitrogen, and phosphorus elements in the tailwater of farmland sources. The gabion purification body is set at the water inlet end of the diversion pipe.

[0012] In a preferred embodiment of the present invention, the gabion purification body includes a gabion that is integrally circular in shape, the inner diameter of the gabion being the same as and coaxial with the inner diameter of the drainage pipe, and the gabion being filled with filter media.

[0013] In a preferred embodiment of the present invention, the particle diameter of the filter packing decreases sequentially from the top to the bottom of the gabion.

[0014] In a preferred embodiment of the present invention, the particle diameter of the filter media ranges from 8 to 16 mm, with the particles disposed at the upper part of the gabion having a diameter of 16 mm and those disposed at the lower part of the gabion having a diameter of 8 mm.

[0015] In a preferred embodiment of the present invention, the filter media is volcanic rock particles.

[0016] In a preferred embodiment of the present invention, the drainage ditch includes a ditch body, and concrete cappings are provided on the top of both sides of the ditch body and along its length.

[0017] Concrete ditch sidewalls are laid on both sides of the ditch body and along the flow direction of its farmland tailwater, and a concrete ditch bottom slab is laid at the bottom of the ditch body and along the flow direction of its farmland tailwater, with both sides connected to the concrete ditch sidewalls.

[0018] In a preferred embodiment of the present invention, the in-situ purification device for farmland effluent further includes a sedimentation well for further purifying the silt, nitrogen, and phosphorus elements in the farmland effluent that has been initially purified by the gabion purification structure. The sedimentation well is located at the inlet end of the diversion ditch.

[0019] In a preferred embodiment of the present invention, the sedimentation well body includes a sedimentation well body that is wider than the ditch body on both sides, sedimentation well sidewalls are provided on both sides of the sedimentation well body and along the flow direction of its farmland tailwater, and a sedimentation well bottom plate is provided at the bottom of the sedimentation well body and along the flow direction of its farmland tailwater, wherein the depth of the sedimentation well bottom plate from the concrete capping is greater than the depth of the concrete ditch bottom plate from the concrete capping.

[0020] In a preferred embodiment of the present invention, a sedimentation well baffle is provided inside the sedimentation well body along its height direction. The sedimentation well baffle divides the lower part of the sedimentation well body into two independent purification chambers and drainage chambers. The purification chamber is located on the side of the sedimentation well body near the water inlet end of the diversion ditch, and the drainage chamber is located on the side of the sedimentation well body away from the water inlet end of the diversion ditch. The two sides of the sedimentation well baffle are respectively connected to the side wall of the sedimentation well.

[0021] In a preferred embodiment of the present invention, an ecological floating island structure is provided in the purification chamber for further purification of the silt, nitrogen, and phosphorus elements in the farmland tailwater that has been initially purified by the gabion purification structure.

[0022] In a preferred embodiment of the present invention, the ecological floating island structure includes a floating substrate capable of floating in the purification chamber. The floating substrate is fixed to the bottom plate of the sedimentation well by a cable. The floating substrate is provided with a plurality of planting holes for planting emergent plants. Emergent plants are planted in the planting holes for further purification of nitrogen and phosphorus elements in the farmland tailwater that has been initially purified by the gabion purification structure.

[0023] In a preferred embodiment of the present invention, biological ropes for purifying microorganisms in agricultural tailwater are suspended on the floating substrate, wherein the biological ropes are arranged at a ratio of 5-10 ropes / m. 2 The density is hung on the lower part of the floating substrate.

[0024] In a preferred embodiment of the present invention, an adsorption filler is provided at the bottom of the drainage chamber for further purification of the silt and sand in the farmland tailwater after it has been purified by the ecological floating island structure.

[0025] In a preferred embodiment of the present invention, the emergent plant is one or more of the following: canna lily, iris, umbrella sedge, and calamus.

[0026] Compared with existing technologies, this invention is simple to construct, has a stable structure, and low cost. It can effectively purify the silt, nitrogen, and phosphorus elements in farmland tailwater from the source, and effectively improve the purification effect of farmland tailwater, bringing great convenience to the thorough purification of farmland tailwater. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 for Figure 1 AA sectional view. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0031] Reference Figures 1-2 As shown in the figure, an in-situ purification device suitable for farmland effluent is provided, including a gabion purification structure 100 and a diversion ditch 200.

[0032] The gabion purification structure 100 can perform preliminary purification of silt, nitrogen, and phosphorus elements in the farmland tailwater at the source of farmland. The inlet end of the gabion purification structure 100 is connected to the farmland tailwater at the source of farmland.

[0033] The diversion ditch 200 can divert the farmland tailwater that has been initially purified by the gabion purification structure 100 to the ecological ditch for further purification. The inlet of the diversion ditch 200 is connected to the outlet of the gabion purification structure 100, and the outlet of the diversion ditch 200 is connected to the ecological ditch that needs to further purify the farmland tailwater.

[0034] The gabion purification structure 100 includes a diversion pipe 120 and a gabion purification body. The diversion pipe 120 is used to divert the farmland tailwater from the source of the farmland to the inside of the diversion ditch 200. The outlet end 121 of the diversion pipe 120 is connected to the inlet end of the diversion ditch 200. The inlet end of the diversion pipe 120 is connected to the farmland tailwater from the source of the farmland and is flush with the ground of the farmland.

[0035] Gabion purification bodies are used for the preliminary purification of silt, nitrogen, and phosphorus elements in the farmland tailwater at the source of farmland. The gabion purification body is installed at the water inlet end of the 120 diversion pipe.

[0036] The gabion purification system includes a gabion 110 that is in the shape of a whole ring. The gabion 110 is woven from galvanized wire mesh. The basic structure of the gabion 110 can be arc-shaped, square, or triangular. During construction, the bottom of the gabion 110 needs to be buried 5-10cm in the soil, mainly for the effective fixation of the gabion 110 and to prevent the gabion 110 from shifting.

[0037] The inner diameter of the gabion 110 is the same as the inner diameter of the drainage pipe 120 and they are coaxial. The gabion 110 is filled with filter media 111. The particle diameter of the filter media 111 decreases from the top to the bottom of the gabion 110. The particle diameter range of the filter media 111 is 8-16mm. The particle diameter of the filter media 111 is 16mm when it is set at the top of the gabion 110 and 8mm when it is set at the bottom of the gabion 110. The filter media 111 is volcanic rock particles.

[0038] Small particle filter media are placed at the bottom of the gabion 110 to enhance the filtration and interception capacity when the drainage pressure is low. Small particle filter media are placed at the top of the gabion 110 to reduce the water resistance capacity when the drainage pressure is high, thus facilitating drainage.

[0039] The drainage ditch 200 includes a ditch body 210, a concrete capping 220 on the top of both sides of the ditch body 210 and along its length, concrete ditch sidewalls 240 on both sides of the ditch body 210 and along the flow direction of its farmland tailwater, and a concrete ditch bottom slab 230 on the bottom of the ditch body 210 and along the flow direction of its farmland tailwater, and both sides are connected to the concrete ditch sidewalls 240.

[0040] The in-situ purification device for farmland effluent also includes a sedimentation well 300 for further purification of the sediment, nitrogen, and phosphorus elements in the farmland effluent that has been initially purified by the gabion purification structure. The sedimentation well 300 is located at the inlet end of the diversion ditch 200.

[0041] The sedimentation well body 300 includes a sedimentation well body that is wider than the ditch body 210 on both sides. Sedimentation well sidewalls 310 are provided on both sides of the sedimentation well body and along the flow direction of its farmland tailwater. Sedimentation well bottom plate 320 is provided at the bottom of the sedimentation well body and along the flow direction of its farmland tailwater. The depth of the sedimentation well bottom plate 320 from the concrete capping 220 is greater than the depth of the concrete ditch bottom plate 230 from the concrete capping 220, and the sedimentation well bottom plate 320 is 30-50cm deeper than the concrete ditch bottom plate.

[0042] A sedimentation well baffle 330 is provided inside the sedimentation well body 300 along its height direction. The height of the sedimentation well baffle 330 can be selected according to the actual situation. It is mainly used to intercept water flow and reduce flow velocity. The sedimentation well baffle 330 is made of cement or permeable brick.

[0043] The sedimentation well partition 330 divides the lower part of the sedimentation well body 300 into two independent purification chambers 360 and drainage chambers 350. The purification chamber 360 is located on the side of the sedimentation well body 300 near the water inlet end of the diversion ditch, and the drainage chamber 350 is located on the side of the sedimentation well body 300 away from the water inlet end of the diversion ditch. The two sides of the sedimentation well partition 330 are respectively connected to the sedimentation well sidewall 310.

[0044] An ecological floating island structure 340 is provided inside the purification chamber 360 for further purification of the mud, sand, nitrogen and phosphorus elements in the farmland tailwater that has been initially purified by the gabion purification structure 100.

[0045] The ecological floating island structure 340 includes a floating substrate 341 that can float in the purification chamber. The floating substrate 341 is fixed to the bottom plate 320 of the sedimentation well by a cable 342. The cable 342 can be made of nylon or polyester and has a diameter of 10-15mm. It is mainly used to prevent the floating substrate from drifting.

[0046] The floating substrate 341 has multiple planting holes 341a for planting emergent plants. Emergent plants 400 are planted in the planting holes 341a to further purify the nitrogen and phosphorus elements in the farmland tailwater that has been initially purified by the gabion purification structure.

[0047] Biological ropes for purifying microorganisms in agricultural tailwater are suspended on the floating substrate 341, with 5-10 ropes per meter. 2 The density is hung on the lower part of the floating substrate, and the length of the biological rope is determined according to the actual site conditions, usually 0.5-2 meters.

[0048] At the bottom of the drainage chamber 350, there is an adsorption filler for further purification of the mud and sand in the farmland tailwater after it has been purified by the ecological floating island structure. The adsorption filler can also be volcanic rock particles.

[0049] Emergent plants 400 consist of one or more combinations of canna lilies, irises, umbrella sedges, and calamus, with a planting density of 5-15 plants / m². 2 Adjustments can be made as needed based on the actual situation.

[0050] The specific operation of this invention is as follows:

[0051] When it is necessary to treat the farmland tailwater at the source of the farmland, simply disconnect the insertion pipe 130 inserted into the inlet of the diversion pipe 120. The farmland tailwater then undergoes preliminary purification through the gabion purification structure 100, intercepting larger floating objects and fine silt. The tailwater then flows through the diversion pipe 120 into the inlet of the sedimentation well, where it settles along with other ditch drainage, causing silt to settle at the bottom and reducing the concentration of suspended solids in the upper water flow. Simultaneously, the emergent plants 400 at the top of the floating substrate 341 and the bio-rope at the bottom of the floating substrate 341 purify and absorb nutrients from the water. The treated water overflows through the sedimentation well baffle 330, settles again before the elevation difference with the ditch, and is then discharged to await further treatment.

[0052] In summary, this invention is simple to construct, has a stable structure, and low cost. It can effectively purify the silt, nitrogen, and phosphorus elements in farmland tailwater at the source, and effectively improve the purification effect of farmland tailwater, bringing great convenience to the thorough purification of farmland tailwater.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An in-situ purification device suitable for farmland effluent, characterized in that, include A gabion purification structure capable of preliminarily purifying the mud, sand, nitrogen, and phosphorus elements in the farmland tailwater at the source of farmland, wherein the inlet end of the gabion purification structure is connected to the farmland tailwater at the source of farmland. A diversion ditch is provided that can divert farmland tailwater that has been initially purified by a gabion purification structure to an ecological ditch for further purification. The inlet of the diversion ditch is connected to the outlet of the gabion purification structure, and the outlet of the diversion ditch is connected to an ecological ditch that needs to further purify farmland tailwater. The gabion purification structure includes: A diversion pipe is used to divert farmland tailwater from the source of farmland into the diversion ditch. The outlet end of the diversion pipe is connected to the inlet end of the diversion ditch, and the inlet end of the diversion pipe is connected to the farmland tailwater from the source of farmland and is flush with the ground of the farmland. A gabion purification body is used to preliminarily purify the mud, sand, nitrogen, and phosphorus elements in the tailwater of farmland sources. The gabion purification body is set at the water inlet end of the diversion pipe. The gabion purification body includes a gabion that is circular in shape. The inner diameter of the gabion is the same as and coaxial with the inner diameter of the drainage pipe. The gabion is filled with filter material. The in-situ purification device for farmland effluent also includes a sedimentation well for further purification of the silt, nitrogen, and phosphorus elements in the farmland tailwater that has been initially purified by the gabion purification structure. The sedimentation well is located at the inlet end of the diversion ditch.

2. The in-situ purification device for farmland effluent as described in claim 1, characterized in that: The diversion ditch includes a ditch body, and concrete cappings are provided on the top of both sides of the ditch body and along its length. Concrete ditch sidewalls are laid on both sides of the ditch body and along the flow direction of its farmland tailwater, and a concrete ditch bottom slab is laid at the bottom of the ditch body and along the flow direction of its farmland tailwater, with both sides connected to the concrete ditch sidewalls.

3. The in-situ purification device for farmland effluent as described in claim 1, characterized in that: The sedimentation well body includes a sedimentation well body that is wider than the ditch body on both sides. Sedimentation well sidewalls are provided on both sides of the sedimentation well body and along the flow direction of its farmland tailwater. Sedimentation well bottom plate is provided at the bottom of the sedimentation well body and along the flow direction of its farmland tailwater. The depth of the sedimentation well bottom plate from the concrete capping is greater than the depth of the concrete ditch bottom plate from the concrete capping.

4. The in-situ purification device for farmland effluent as described in claim 3, characterized in that: A sedimentation well baffle is provided inside the sedimentation well body along its height direction. The sedimentation well baffle divides the lower part of the sedimentation well body into two independent purification chambers and drainage chambers. The purification chamber is located on the side of the sedimentation well body near the water inlet end of the diversion ditch, and the drainage chamber is located on the side of the sedimentation well body away from the water inlet end of the diversion ditch. The two sides of the sedimentation well baffle are respectively connected to the side wall of the sedimentation well.

5. The in-situ purification device for farmland effluent as described in claim 4, characterized in that: The purification chamber is equipped with an ecological floating island structure for further purification of the silt, nitrogen, and phosphorus elements in the farmland tailwater that has been initially purified by the gabion purification structure.

6. The in-situ purification device for farmland effluent as described in claim 5, characterized in that: The ecological floating island structure includes a floating substrate that can float in the purification chamber. The floating substrate is fixed to the bottom plate of the sedimentation well by a cable. The floating substrate is provided with a number of planting holes for planting emergent plants. Emergent plants are planted in the planting holes to further purify the nitrogen and phosphorus elements in the farmland tailwater that has been initially purified by the gabion purification structure.

7. The in-situ purification device for farmland effluent as described in claim 6, characterized in that: Biological ropes for purifying microorganisms in agricultural tailwater are suspended on the floating substrate, with 5-10 ropes per meter. 2 The density is hung on the lower part of the floating substrate.

Images