Denitrifying bacteria for controlling nitrogen pollution from end-of-pipe sources

Abstract

The utility model discloses a kind of denitrification bodies of end resistance control non-point source nitrogen pollution, belong to non-point source nitrogen pollution control technical field;It includes: denitrification module and anti-surge module, the denitrification module includes matrix resistance control body layer and pressure penetration unit, the pressure penetration unit includes pipe body inserted in the matrix resistance control body layer and the carbon source filling body for providing carbon source for denitrifying bacteria, the pipe body is set along the thickness direction of the matrix resistance control body layer, the carbon source filling body is filled in the pipe body, to resist extrusion of outside, keep good permeability;Anti-surge module is set to both sides of the matrix resistance control body layer, the anti-surge module can reduce the wave impact force of invasion matrix resistance control body layer.The utility model can construct and maintain the anti-pressure structure of internal permeation channel stability, while enhancing the anti-erosion ability of resistance control body edge.

Description

Technical Field

[0001] This utility model relates to the field of non-point source nitrogen pollution control technology, and in particular to a denitrifier for end-of-pipe control of non-point source nitrogen pollution. Background Technology

[0002] Non-point source pollution from surface runoff is characterized by its dispersed sources and large fluctuations in pollution load, making traditional point-source denitrification processes ineffective in addressing this type of pollution problem. In existing technologies, setting up end-of-pipe control systems along the riverbank is an important means of controlling non-point source nitrogen pollution. These systems primarily rely on physical adsorption and microbial denitrification to reduce the nitrogen load in runoff.

[0003] However, existing end-of-pipe (EIP) systems have significant drawbacks in practical applications: First, due to the long-term effects of gravity, the internal structure is easily compacted, leading to decreased permeability and affecting the passage efficiency of nitrogen-containing water. Second, the shoreline environment is frequently subjected to wave erosion, and existing EIP systems lack effective surge-resistant structures, making them susceptible to damage from erosion and severely impacting the system's lifespan and purification efficiency. These problems severely restrict the application of EIP technology in practical engineering projects. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0004] In view of this, it is necessary to provide a denitrifier for end-of-pipe control of non-point source nitrogen pollution to solve the problems of poor permeability and easy damage by surges in existing end-of-pipe control systems.

[0005] This invention provides a denitrifier for end-of-pipe control of non-point source nitrogen pollution, comprising:

[0006] The denitrification module includes a substrate barrier layer and a pressure-resistant permeation unit. The pressure-resistant permeation unit includes a tube inserted into the substrate barrier layer and a carbon source filler for providing a carbon source for denitrifying bacteria. The tube is arranged along the thickness direction of the substrate barrier layer, and the carbon source filler is filled in the tube to resist external pressure and maintain good permeability.

[0007] Surge protection modules are disposed on both sides of the matrix control layer, and the surge protection modules can reduce the wave impact force intruding into the matrix control layer.

[0008] Furthermore, the carbon source filler is a mixed column of a first carbon source and sand particles.

[0009] Furthermore, the first carbon source is a solid slow-release carbon source.

[0010] Furthermore, multiple tubes are arranged in an array within the matrix resistive layer.

[0011] Furthermore, the tube body is set horizontally or relatively inclined.

[0012] Furthermore, the tube body is made of stainless steel, plastic, or bamboo.

[0013] Furthermore, the matrix barrier layer is a mixture of a second carbon source, gravel, and soil.

[0014] Furthermore, the surge protection module includes a gravel layer and a metal mesh, with the gravel layer connected to the matrix control layer and the metal mesh on both sides respectively.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) The present invention provides a denitrification system for end-of-pipe non-point source nitrogen pollution control, comprising a denitrification module, which includes a substrate barrier layer and a pressure-resistant permeation unit. The pressure-resistant permeation unit includes a pipe and a carbon source filler. The pipe is inserted into the substrate barrier layer, and the carbon source filler is filled into the pipe. The pipe can resist the pressure from the substrate barrier layer, maintain the basic shape of the carbon source filler, protect the carbon source filler from external pressure, and maintain the permeability of the carbon source filler. The pipe is arranged along the thickness direction of the substrate barrier layer. Water located on one side of the substrate barrier layer can enter the other side of the substrate barrier layer through the pipe. The pressure-resistant permeation unit can ensure the water flow rate. The carbon source filler can provide carbon source for denitrifying bacteria, promote the denitrification reaction, and treat nitrogen in the water.

[0017] (2) The denitrifier of the present invention for end-of-pipe non-point source nitrogen pollution is provided with an anti-surge module. The anti-surge module is set on both sides of the matrix control layer. The anti-surge module can resist the impact of waves from the external water body, thereby reducing the impact force, protecting the matrix control layer from damage, and extending the service life of the denitrifier. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a cross-sectional view of the entire utility model;

[0020] Figure 2 This is a cross-sectional view of the denitrification module in this utility model;

[0021] Figure 3 yes Figure 1 A magnified structural diagram of point A;

[0022] Figure 4 yes Figure 2 A magnified structural diagram of part B.

[0023] In the diagram, 100 is the denitrification module; 110 is the matrix barrier layer; 120 is the pressure-resistant permeation unit; 121 is the pipe body; 122 is the carbon source filler; 200 is the surge-resistant module; 210 is the gravel layer; and 220 is the metal mesh. Detailed Implementation

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0025] This embodiment describes a denitrification system for end-point control of non-point source nitrogen pollution, relating to the field of non-point source nitrogen pollution control technology. By incorporating a pressure-resistant pipe 121 within the denitrification system and a carbon source filler 122 within the pipe 121, the carbon source filler 122 can withstand external pressure and maintain excellent permeability. An anti-surge module 200 protects the entire denitrification system from erosion by water waves, extending its service life. This example of an end-point control denitrification system for non-point source nitrogen pollution not only constructs a pressure-resistant structure to maintain the stability of the internal permeation channels but also enhances the erosion resistance of the control system's edges.

[0026] Please see Figures 1 to 4 In this embodiment, a denitrifier for end-point control of non-point source nitrogen pollution includes a denitrification module 100 and a surge protection module 200. The denitrification module 100 can improve the permeability of the denitrifier, and the surge protection module 200 can prevent waves from eroding the denitrifier.

[0027] The denitrification module 100 includes a substrate barrier layer 110 and a pressure-resistant permeation unit 120. The pressure-resistant permeation unit 120 includes a pipe 121 and a carbon source filler 122. The pipe 121 is inserted into the substrate barrier layer, and the carbon source filler 122 is filled into the pipe 121. The pipe 121 can resist the pressure from the substrate barrier layer 110, maintain the basic shape of the carbon source filler 122, protect the carbon source filler 122 from external pressure, and maintain the permeability of the carbon source filler 122. The pipe 121 is arranged along the thickness direction of the substrate barrier layer 110. Water located on one side of the substrate barrier layer 110 can enter the other side of the substrate barrier layer 110 through the pipe 121. The pressure-resistant permeation unit 120 can ensure the water flow rate. The carbon source filler 122 can provide carbon source for denitrifying bacteria, promote the denitrification reaction, and treat nitrogen in the water.

[0028] The surge protection module 200 is installed on both sides of the matrix control layer 110. The surge protection module 200 can resist the impact of waves from the external water body, reduce the impact force, protect the matrix control layer 110 from damage, and extend the service life of the denitrifier.

[0029] In some embodiments, the carbon source filler 122 is a columnar filler formed by carbon source material and sand particles. Specifically, it can be achieved by mixing solid slow-release carbon source and sand particles with a particle size of 0.5 mm to 2 mm at a mass ratio of 1:2 to 1:4 and then pressing them into shape. The sand particles are used to increase the structural strength of the mixed column and prevent the carbon source from absorbing water and expanding, which would cause blockage of the permeation channels inside the tube 121.

[0030] Among them, the hybrid column refers to a composite column formed through physical mixing and pressing processes, which can be achieved by segmented filling or integral molding. The mixing ratio of carbon source and sand can be adjusted according to actual compressive strength requirements, for example, increasing the proportion of sand in areas with frequent surges to enhance deformation resistance.

[0031] Specifically, the mixed column is filled inside the tube 121, with sand particles forming a rigid support framework between the carbon source particles, allowing the tube 121 to maintain a stable pore structure even under external pressure. When water flows through the tube 121, the gaps between the sand particles accelerate the contact between the nitrogen-containing water and the carbon source. The solid slow-release carbon source continuously releases dissolved organic matter, providing metabolic substrates for denitrifying bacteria. The sand particle content of the mixed column can be controlled within the range of 30% to 50%, avoiding both excessive carbon source accumulation leading to decreased permeability and preventing the column from breaking due to insufficient mechanical strength.

[0032] Compared to existing technologies, the carbon source filling layer in traditional end-of-line control bodies lacks a rigid support structure and is prone to collapse under long-term pressure, leading to reduced permeability. The carbon source and sand particles, as a mixed component, allow the filling body to maintain the slow-release function of the carbon source while resisting the damage to the permeation channels caused by external pressure, thereby maintaining stable hydraulic conductivity.

[0033] It should be noted that the carbon source is wood chips, rice straw, stalks, or peanut shells, etc., and the above carbon sources are crushed into granules.

[0034] In some embodiments, please refer to Figure 2 Multiple tubes 121 are arrayed in the matrix resistive layer 110. Specifically, the tubes 121 can be implemented in a rectangular array or a ring array. The orderly distribution avoids structural instability caused by local accumulation.

[0035] Specifically, the pipes 121 are arranged in the matrix barrier layer 110 with equal row and column spacing, forming uniform permeation channels that penetrate the thickness of the barrier layer. When water flows through the carbon source filled inside the pipes 121, the denitrifying bacteria receive a continuous carbon source supply, and the array arrangement allows the water to permeate through multiple paths within the barrier layer, avoiding media compaction caused by localized pressure concentration. The regular distribution of the pipes 121 also provides three-dimensional support for the matrix barrier layer 110, ensuring the integrity of its pore structure when subjected to external pressure.

[0036] Compared with existing technologies, traditional end-of-line control structures often employ random or centralized arrangements of pipes 121, resulting in a single water flow path and making it easy for compaction zones to form under gravity. In contrast, the array arrangement of pipes 121 creates a crisscrossing permeation network within the matrix control layer 110. This disperses the water flow, reducing its velocity and effectively weakening the compaction effect of gravity on the medium, while simultaneously enhancing the overall compressive strength of the structure.

[0037] As a further embodiment, the tube body 121 is arranged horizontally or relatively inclined.

[0038] When the pipe body 121 is set horizontally, the pipe body 121 extends and is arranged along the horizontal direction of the matrix barrier layer 110. Specifically, it can be achieved by being parallel to the ground or the direction of water flow. By uniformly distributing the permeation path, the decrease in permeability caused by local pressure can be alleviated.

[0039] When the pipe body 121 is set at a relative angle, the pipe body 121 is inserted into the matrix barrier layer 110 at a preset angle. Specifically, it can be achieved by symmetrical or staggered arrangement. By increasing the contact area between the water and the carbon source filler 122, the denitrification efficiency is improved.

[0040] Specifically, the horizontally arranged pipe 121 forms a stable horizontal infiltration channel within the matrix barrier layer 110. When nitrogen-containing water flows through it under gravity, the carbon source filled inside the pipe 121 comes into full contact with the water flow. At the same time, the structure of the pipe 121 resists the compression of the upper matrix, preventing the infiltration channel from collapsing.

[0041] The relatively inclined pipe 121 can prolong the residence time of water inside the pipe 121 and promote the metabolic activity of denitrifying bacteria by adjusting the angle between the axis of the pipe 121 and the direction of water flow, for example, by using an inclination angle of 30° to 60°.

[0042] Compared with existing technologies, the pipes 121 in traditional end-of-line control systems are usually vertically or randomly distributed, which makes the permeation path susceptible to compression and deformation, and limits the water flow rate. By arranging the pipes 121 horizontally or at an angle, the arrangement of the pipes 121 can be optimized. This avoids the permeability loss caused by the concentration of upper pressure when arranged vertically, and the water flow dynamics can be controlled by the tilt angle, thereby enhancing the system's pressure resistance and denitrification efficiency.

[0043] In the specific implementation process, the pipe body 121 is a stainless steel pipe, a plastic pipe, or a bamboo pipe.

[0044] Stainless steel pipes refer to tubular structural components made primarily of iron-based alloys, specifically austenitic stainless steel or duplex stainless steel. They possess high pressure resistance and corrosion resistance, enabling them to maintain structural integrity over long periods in humid environments.

[0045] Plastic pipes refer to tubular structural components made from high molecular polymers. Specifically, they can be extruded from polyvinyl chloride or high-density polyethylene. They are lightweight and resistant to chemical corrosion, which can effectively reduce installation costs and adapt to complex terrain conditions.

[0046] Among them, bamboo tubes refer to tubular structural components made of natural bamboo that have undergone anti-corrosion treatment. Specifically, bamboo can be treated with carbonization or resin impregnation processes. It has biodegradable and environmentally friendly characteristics, and can reduce ecological disturbance while maintaining its supporting function.

[0047] Specifically, the material selection of pipe body 121, which serves as the supporting carrier for carbon source filler 122, directly affects its compressive strength and environmental adaptability. Stainless steel pipes resist soil pressure through a rigid structure, maintaining the porosity of the carbon source filler 122 within pipe body 121; plastic pipes utilize their elastic deformation capacity to alleviate external loads and ensure the stability of the permeation channel; bamboo pipes disperse stress through their fibrous layered structure, achieving biomass recycling while meeting mechanical requirements. All three materials can form a stable axial support system, preventing the matrix barrier layer 110 from collapsing due to gravity, thus preventing a decrease in permeability.

[0048] Compared to existing technologies, traditional end-point control systems often use single-material concrete or clay pipes, which are heavy and prone to causing soil compaction. Furthermore, these brittle materials are susceptible to breakage under surge impact. Stainless steel, plastic, or bamboo pipes, while maintaining compressive strength, are relatively lightweight. Stainless steel pipes improve corrosion resistance and lifespan, plastic pipes optimize cost and installation efficiency, and bamboo pipes enhance ecological harmony.

[0049] In some embodiments, the matrix barrier layer is a mixture of a second carbon source, gravel, and soil.

[0050] The second carbon source provides the organic carbon needed for the metabolism of denitrifying bacteria. This can be achieved using a solid slow-release carbon source, which maintains microbial activity by slowly releasing the carbon source. The second carbon source is consistent with the first carbon source.

[0051] Among them, gravel refers to hard materials composed of rock particles, specifically crushed stone with a particle size of 5-20 mm, which enhances the permeability and structural stability of the mixed layer through the gaps between the particles.

[0052] Soil refers to a natural medium containing clay, sand, or humus. Specifically, it can be achieved by mixing local soil with carbon sources and gravel, which can trap pollutants through adsorption and provide a habitat for microorganisms.

[0053] Specifically, the matrix control layer is a composite structure formed by mixing carbon source, gravel, and soil in a specific ratio and then laying them in layers or uniformly mixing them. The carbon source provides a continuous supply of carbon for the denitrification reaction. The gravel forms a rigid skeleton in the mixed layer to resist external pressure and prevent excessive compaction of the matrix; at the same time, the gaps between the gravel and the soil form infiltration channels, ensuring that nitrogen-containing water can quickly pass through the mixed layer. The soil in the mixed layer temporarily traps nitrogen pollutants through adsorption, prolonging its contact time with denitrifying bacteria, while the combination of carbon source and soil further promotes the stable reproduction of the microbial community.

[0054] Compared to existing technologies, traditional end-of-pipe control systems typically use a single material such as pure soil or gravel layers 210, which are prone to decreased permeability due to loose structure or excessive density. In contrast, the mixed layer achieves a balance between compressive strength and denitrification efficiency through the synergistic effect of carbon source, gravel, and soil. It utilizes gravel to maintain porosity and enhances microbial activity through the combination of soil and carbon source.

[0055] In some embodiments, please refer to Figure 1 The surge protection module 200 includes a gravel layer 210 and a metal mesh 220. The two sides of the gravel layer 210 are connected to the matrix control layer 110 and the metal mesh 220, respectively.

[0056] Among them, the gravel layer 210 refers to a structural layer composed of rock fragments of varying sizes, specifically formed by the accumulation of natural gravel with a diameter ranging from 5 to 30 millimeters. Its porous structure buffers the impact of water flow while allowing water infiltration, thus dispersing the kinetic energy of surges.

[0057] The metal mesh 220 refers to a mesh support structure woven from corrosion-resistant metal materials, specifically galvanized steel wire or aluminum alloy. It fixes the position of the gravel layer 210 through the mesh gaps, preventing the gravel from being washed away by water flow, while maintaining the structural integrity and external stability.

[0058] Specifically, the gravel layer 210 is arranged outside the matrix barrier layer 110, directly bearing the impact of wave surges from the water body. When a wave surge acts on the surface of the gravel layer 210, the water flow energy is dispersed and weakened by the pores between the gravels, reducing the erosive effect on the matrix barrier layer 110. The metal mesh 220 is set outside the gravel layer 210, and the mesh structure confines the gravel within a predetermined area, preventing gravel loss due to long-term erosion. A mechanically complementary relationship is formed between the gravel layer 210 and the metal mesh 220: the gravel layer 210 absorbs the impact energy, and the metal mesh 220 maintains the structural integrity, thereby jointly resisting the periodic erosion of waves.

[0059] Workflow: A denitrification body is constructed along the shore of the water area to be purified according to the structure described in this application. External nitrogen-containing water impacts the gravel layer 210, and the energy of the water flow is dispersed and weakened by the pores between the gravel. Water in contact with the denitrification module 100 can pass slowly through the matrix barrier layer 110 or quickly through the pressure-resistant infiltration unit 120, thus maintaining the overall permeability of the denitrification module 100. The carbon source located in the pressure-resistant infiltration unit 120 and the matrix barrier layer 110 can provide energy for the denitrifying bacteria, promoting nitrogen fixation.

[0060] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. A denitrifier for end-of-pipe control of diffuse nitrogen pollution, characterized in that, The application relates to a denitrification module, which comprises a substrate control layer and a pressure-permeation-resistant unit, wherein the pressure-permeation-resistant unit comprises a pipe body inserted into the substrate control layer and a carbon source filling body for providing a carbon source for denitrifying bacteria, the pipe body is arranged along the thickness direction of the substrate control layer, and the carbon source filling body is filled in the pipe body to resist extrusion from the outside and maintain good permeability. Surge-resistant modules are arranged on both sides of the substrate control layer, and the surge-resistant modules can reduce the wave impact force invading the substrate control layer. A plurality of pipe bodies are arranged in an array in the substrate control layer.

2. The denitrifying organism of claim 1, wherein the end control of the surface source of nitrogen pollution is characterized by, The pipe bodies are horizontally arranged or relatively inclinedly arranged.

3. The denitrifier for end-of-pipe control of diffuse nitrogen pollution according to claim 2, characterized in that, The pipe bodies are stainless steel pipes, plastic pipes or bamboo pipes.

4. The denitrifier for end-of-pipe control of diffuse nitrogen pollution according to claim 1, characterized in that, The surge-resistant modules comprise gravel layers and metal grids, and the two sides of each gravel layer are connected with the substrate control layer and the metal grid respectively.

5. The denitrifier for end-of-pipe control of diffuse nitrogen pollution according to claim 1, characterized in that, ​

Images