Solar energy sulfur autotrophic denitrification ship for in-situ denitrification of river water

Abstract

The present application relates to a kind of solar energy sulfur autotrophic denitrification ship for river water in situ denitrification, including gas stripping device being arranged on ship, nitrification zone and denitrification zone, gas stripping device is connected main gas stripping pipe and several sub gas stripping pipes, nitrification zone is connected inlet pipe, the inlet of inlet pipe is close to the propeller of ship, main gas stripping pipe is connected the bottom of inlet pipe;Several sub gas stripping pipes are evenly distributed in nitrification zone, for the sewage is lifted to the upper portion of nitrification zone;The lower portion of nitrification zone is equipped with several carrier parts one that can translate, carrier part one is filled with biological load particles, the upper portion of nitrification zone is equipped with corrugated carrier part two, and carrier part two is filled with biological load filler;Denitrification zone is equipped with corrugated carrier part three, and carrier part three is filled with biological load filler and biological load particles, the side of carrier part three towards the upstream side of denitrification zone is all porous plate, and the side towards the downstream side of denitrification zone is all net face, and net face reduces the resistance of sewage through carrier part three.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a solar-powered autotrophic denitrification vessel for in-situ denitrification of river water. Background Technology

[0002] Currently, the main measures for treating these polluted water bodies include non-point source pollution control, surface debris removal, bottom dredging, ecological restoration, and clean water replenishment. However, the treatment process often requires the addition of large amounts of carbon sources, significantly increasing wastewater treatment costs. Furthermore, improper control of the type or quantity of carbon sources can lead to secondary pollution from residual organic carbon. In addition, traditional treatment processes require increasing the nitrification liquor recirculation ratio after aerobic biological treatment, and the sludge produced from biological treatment must undergo further sedimentation and other processes, resulting in a lengthy and inefficient wastewater treatment process. Wastewater treatment methods for rivers, lakes, and other bodies of water often require large-scale ecological or water conservancy projects, along with supporting wastewater treatment plants and complete sets of equipment. These methods involve significant investment of facilities, manpower, and funds, diverting polluted water from ponds, rivers, and lakes to fixed onshore wastewater treatment facilities for treatment before returning the treated water to the water bodies.

[0003] This traditional treatment method easily leads to the idleness and waste of resources such as permanent water treatment equipment and facilities, and results in high investment and operating costs, making it difficult to promote and implement this method in practice. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a solar-powered autotrophic denitrification vessel for in-situ denitrification of river water. The vessel includes an air-lift device, a nitrification zone, a denitrification zone, and solar panels. The air-lift device is connected to a main air-lift pipe and several branch air-lift pipes. An inlet pipe is connected to the upstream side of the nitrification zone, with its inlet located near the propeller at the stern of the vessel. The main air-lift pipe is connected to the bottom of the inlet pipe for air-lifting water. Several branch air-lift pipes are evenly distributed within the nitrification zone to lift wastewater to the upper part of the nitrification zone, creating a vertical water flow that complements the existing horizontal water flow within the nitrification zone.

[0005] The lower part of the nitrification zone is provided with several carrier sections 1 that can move horizontally. The carrier sections 1 are filled with biological load particles. The upper part of the nitrification zone is provided with corrugated carrier sections 2, which are filled with biological load packing.

[0006] The denitrification zone is equipped with a corrugated carrier section three, which is filled with biological load packing material and biological load particles. The sides of the carrier section three facing the upstream side of the denitrification zone are all perforated plates, while the sides facing the downstream side of the denitrification zone are all mesh surfaces. The mesh surfaces can reduce the resistance of wastewater passing through the carrier section three.

[0007] This invention targets pollutants such as ammonia nitrogen and total nitrogen in water bodies such as ponds, rivers, lakes, and waterways. It employs a sulfur-autotrophic nitrification and denitrification treatment method, utilizing a ship-borne system to house the nitrification and denitrification zones. This system offers advantages such as in-situ treatment, speed, convenience, and portability. Water is drawn from near the ship's propeller through the inlet pipe. The propeller's rotation disturbs the surrounding water, resulting in a more uniform wastewater quality, eliminating the need for equalization or regulating tanks. Furthermore, the reduced aquatic vegetation and sludge in this area eliminate the need for pre-filtration. Simultaneously, the propeller's rotation introduces air into the water and inlet pipe, reducing the air consumption of the main air lift pipe, saving energy, and improving air lift efficiency. The main air lift pipe supplies air to the inlet pipe, propelling the wastewater along the inlet pipe into the nitrification zone. Within the nitrification zone, wastewater generally flows laterally from upstream to downstream. Several gas lift pipes raise the corresponding wastewater gases to the upper part of the nitrification zone, while the wastewater flows naturally downwards, creating several vertical water flows. These vertical flows, combined with the existing horizontal water flows, increase water turbulence within the nitrification zone, promote biochemical reactions, and improve wastewater treatment efficiency. Both the biological load particles in carrier section one and the biological load packing in carrier section two are loaded with sulfur-autotrophic nitrifying bacteria. In the denitrification zone, both the biological load particles and the biological load packing are loaded with sulfur-autotrophic denitrifying bacteria.

[0008] Optionally, a square sulfur autotrophic treatment tank and a gas source are placed on the vessel. The gas source is connected to the main gas lift pipe and the branch gas lift pipe. The sulfur autotrophic treatment tank is arranged with a nitrification zone and a denitrification zone in sequence. A water inlet pipe is connected to the top of one end of the sulfur autotrophic treatment tank, and a water outlet pipe is provided at the other end to discharge the treated water into the river. The water inlet pipe extends downward to the bottom of the vessel. A partition plate is provided between the nitrification zone and the denitrification zone. A water passage hole is provided in the middle of the partition plate to input the water treated in the nitrification zone into the denitrification zone.

[0009] Optionally, the plurality of gas-rising pipes are evenly arranged along the length of the nitration zone, with the bottom of the gas-rising pipes at the bottom of the nitration zone and the top of the gas-rising pipes above the liquid surface of the nitration zone.

[0010] Several gas-lifting tubes are arranged in a row, and a row of biochemical load components are set on both sides of the gas-lifting tubes. The biochemical load components include several carrier parts stacked one on top of each other. The carrier part is a square mesh cage with a mesh size smaller than the particle size of the bio-load particles.

[0011] The bottom of the carrier section 1 is slidably connected to a track, which is parallel to the length direction of the nitration zone. A drive device is provided on the upstream or downstream side of the nitration zone to drive the carrier section 1 to move back and forth along the track.

[0012] Further optionally, a driving device is provided on the upstream side of the nitrification zone corresponding to the middle position of each biochemical load component, and a driving device is provided on the downstream side of the nitrification zone corresponding to the middle position of each biochemical load component, that is, four driving devices are provided at the bottom of the nitrification zone.

[0013] In a biochemical load assembly, two adjacent carrier sections are respectively connected to two driving devices corresponding to the biochemical load assembly, and one driving device is connected in parallel to several carrier sections.

[0014] Alternatively, the carrier section is a long, flat, square mesh cage. The top surface of the carrier section has evenly distributed undulating troughs and crests. The troughs and crests are alternately arranged in both the transverse and longitudinal directions of the top surface. The other sides of the carrier section are flat.

[0015] Optionally, the second carrier section includes several inclined square mesh cages connected end to end. The second carrier section is placed horizontally so that the second carrier section forms a corrugated shape with crests and troughs. The crests are close to the liquid surface of the nitration zone, and the troughs are close to the uppermost first carrier section.

[0016] Bio-loaded packing materials are made of plastic or fiber, such as conventional suspended packing materials (hollow spheres, stepped rings, Raschig rings, Pall rings, etc.). The walls of the packing are loaded with microbial films, which can perform biochemical treatment of wastewater.

[0017] Optionally, the structure of the third carrier section is the same as that of the second carrier section. The third carrier section includes several inclined square mesh cages connected end to end. The third carrier section is placed horizontally so that the third carrier section forms a corrugated shape with crests and troughs. The crests are close to the liquid surface of the denitrification zone, and the troughs are close to the bottom of the denitrification zone.

[0018] The water-facing surface of the mesh cage in the third carrier section is a perforated plate, which facilitates the sliding of sludge in the sewage along the perforated plate and promotes sludge-water separation. The through holes on the perforated plate are distributed in a matrix, with gaps between the two vertical rows of through holes, which serve as channels for the sludge to slide down. The other sides of the mesh cage in the third carrier section are mesh surfaces, and the diameter of the through holes and the mesh holes in the perforated plate are both larger than the particle size of the loaded particles inside the third carrier section.

[0019] Optionally, the carrier section three has a horizontally arranged central shaft in the middle. One end of the central shaft is rotatably connected to the upstream sidewall of the denitrification zone, and the other end passes through the downstream sidewall and is connected to a motor. The central shaft runs through the middle of all the mesh cages in the carrier section three. The motor drives the carrier section three to rotate through the central shaft, which is conducive to the uniform distribution of the internal biological load packing and biological load particles. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the solar-powered autotrophic denitrification vessel used for in-situ denitrification of river water.

[0021] Figure 2 This is a schematic diagram of the carrier section and its connection with the track.

[0022] In the attached diagram, 1-nitrification zone, 2-denitrification zone, 3-main gas lift pipe, 4-distribution gas lift pipe, 5-water inlet pipe, 6-carrier section one, 7-carrier section two, 8-carrier section three, 9-central shaft, 10-sulfur autotrophic treatment box, 11-drive device, 12-track. Detailed Implementation

[0023] This embodiment provides a solar-powered autotrophic denitrification vessel for in-situ denitrification of river water, such as... Figures 1-2 As shown, the system includes an air-lift device, a nitrification zone 1, a denitrification zone 2, and solar panels mounted on the ship. The air-lift device is connected to a main air-lift pipe 3 and several branch air-lift pipes 4. The upstream side of the nitrification zone 1 is connected to a water inlet pipe 5. The inlet of the water inlet pipe 5 is close to the propeller at the stern of the ship. The main air-lift pipe 3 is connected to the bottom of the water inlet pipe 5 and is used for air-lifting water. Several branch air-lift pipes 4 are evenly distributed in the nitrification zone 1 and are used to lift wastewater to the upper part of the nitrification zone 1. The resulting vertical water flow cooperates with the original horizontal water flow in the nitrification zone 1.

[0024] The lower part of the nitrification zone 1 is provided with several carrier sections 1 6 that can move horizontally. The carrier sections 1 6 are filled with biological load particles. The upper part of the nitrification zone 1 is provided with corrugated carrier sections 2 7, which are filled with biological load packing.

[0025] The denitrification zone 2 is equipped with a corrugated carrier section 3 8, which is filled with biological load packing material and biological load particles. The sides of the carrier section 3 8 facing the upstream side of the denitrification zone are all perforated plates, and the sides facing the downstream side of the denitrification zone are all mesh surfaces. The perforated plates are conducive to the settling of sludge in the wastewater, and the mesh surfaces can reduce the resistance of wastewater passing through the carrier section 3 8.

[0026] Optionally, a square sulfur autotrophic treatment tank 10 and an air source are placed on the vessel. The air source is connected to a main air lift pipe 3 and a branch air lift pipe 4. A nitrification zone 1 and a denitrification zone 2 are sequentially arranged inside the sulfur autotrophic treatment tank 10. A water inlet pipe 5 is connected to the top of one end of the sulfur autotrophic treatment tank 10, and a water outlet pipe is provided at the other end to discharge the treated water into the river. The water inlet pipe 5 extends downwards to the underside of the vessel. A partition plate is provided between the nitrification zone 1 and the denitrification zone 2, with a water passage hole in the middle of the partition plate for inputting the water treated in the nitrification zone 1 into the denitrification zone 2. The position of the water outlet pipe above and below the denitrification zone is set according to the actual treatment situation. The air lift device is a conventional existing air lift device.

[0027] Optionally, the plurality of gas-lifting pipes 4 are evenly arranged along the length of the nitration zone 1, with the bottom of the gas-lifting pipe 4 at the bottom of the nitration zone 1 and the top of the gas-lifting pipe 4 above the liquid surface of the nitration zone 1.

[0028] Several gas-lifting pipes 4 are arranged in a row, and a row of biochemical load components are set on both sides of the gas-lifting pipes 4. The biochemical load components include several carrier parts 6 stacked on top of each other. The carrier parts 6 are square mesh cages with mesh pores smaller than the particle size of the bio-load particles.

[0029] The bottom of the carrier section 6 is slidably connected to the track 12, which is parallel to the length direction of the nitration zone 1. A drive device 11 is provided on the upstream or downstream side of the nitration zone 1 to drive the carrier section 6 to move back and forth along the track 12.

[0030] Optionally, the track 12 includes two parallel track rods that can stably support the carrier section 6; the two ends of the track rods are fixed to the upstream and downstream sides of the nitrification zone 1, respectively. There is a gap between two adjacent carrier sections 6 to allow water flow without affecting the movement of the carrier section 6.

[0031] Further optionally, a driving device is provided on the upstream side of the nitrification zone 1 corresponding to the middle position of each biochemical load component, and a driving device is provided on the downstream side of the nitrification zone 1 corresponding to the middle position of each biochemical load component, that is, four driving devices are provided at the lower part of the nitrification zone 1.

[0032] In a biochemical load assembly, two adjacent carrier sections 6 are respectively connected to two corresponding drive devices of the biochemical load assembly, and one drive device is connected in parallel to several carrier sections 6. The drive device is a conventional mechanical device, such as a hydraulic cylinder or other mechanical device.

[0033] In one specific implementation, the nitrification zone 1 is provided with a first biochemical loading component and a second biochemical loading component. The front end of the first biochemical loading component corresponds to a first driving device, and the rear end corresponds to a second driving device. The front end of the second biochemical loading component corresponds to a third driving device, and the rear end corresponds to a fourth driving device. The first driving device is connected in parallel with the odd-numbered carrier sections 6 of the first biochemical loading component (i.e., the first, third, fifth, etc. from top to bottom) via rods. The second driving device is connected in parallel with the even-numbered carrier sections 6 of the first biochemical loading component (i.e., the second, fourth, sixth, etc. from top to bottom) via rods. The first and second driving devices can control adjacent carrier sections 6 to move in opposite directions, so that the water flowing through these two carrier sections 6 will generate local tangential flow. The water flow will change from longitudinal to oblique through the carrier section 6, increasing the contact opportunity and residence time with the biological loading particles in the carrier section 6. When the water flows through the next carrier section 6, it changes to tangential flow in the opposite direction again, increasing the microenvironment disturbance of the water body. Similarly, the third drive unit connects the odd-numbered carrier section 6 of the second biochemical load assembly in parallel via a rod (i.e., the first, third, fifth, etc., counting from top to bottom), and the fourth drive unit connects the even-numbered carrier section 6 of the second biochemical load assembly in parallel via a rod (i.e., the second, fourth, sixth, etc., counting from top to bottom).

[0034] Optionally, the carrier section 6 is a long, flat, rectangular mesh cage. The top surface of the carrier section 6 has evenly distributed undulating troughs and crests, alternating between them in both the transverse and longitudinal directions. The other sides of the carrier section 6 are flat. When water flows through the top surface of the carrier section 6, it encounters the undulating mesh, making the aforementioned tangential flow more complex. This creates chaotic small vortex flows on the top surface of the carrier section 6. This flow pattern extends into the interior of the carrier section 6, ensuring sufficient contact between the wastewater and the biological load particles, and effectively agitating the biological load particles, thus preventing uneven distribution phenomena such as particle deposition or agglomeration.

[0035] As mentioned earlier, the gas-lift pipe 4 in the nitrification zone 1 can lift the wastewater at the bottom of the nitrification zone 1 to above the liquid surface. This wastewater flows from top to bottom, forming several longitudinal water flows arranged along their length within the nitrification zone 1. If the carrier section 6 is fixed, it will continuously experience downward water flow at certain points, leading to severe accumulation of carrier particles at these points. The driving device of this invention moves the carrier section 6 horizontally back and forth, loosening and redistributing the internal carrier particles. Several partition meshes can be installed inside the carrier section 6 to divide it into several parts, preventing carrier particles from accumulating downstream.

[0036] Optionally, the carrier section 2 7 includes several inclined square mesh cages connected end to end. The carrier section 2 7 is placed horizontally so that the carrier section 2 7 forms a corrugated shape with crests and troughs. The crests are close to the liquid surface of the nitration zone 1, and the troughs are close to the uppermost carrier section 1 6.

[0037] Bio-loaded packing materials are made of plastic or fiber, such as conventional suspended packing materials (hollow spheres, stepped rings, Raschig rings, Pall rings, etc.). The walls of the packing are loaded with microbial films, which can perform biochemical treatment of wastewater.

[0038] The two sides of the carrier section 2 7 are detachably mounted on the inner walls of the two sides of the nitration zone 1.

[0039] The inclined mesh cages of carrier section 2 7 can receive both horizontal and vertical water flows, allowing the water to pass through each cage sequentially and making full use of the internal biological load packing material. Since the packing material has a density less than water, it floats upwards. Meanwhile, the downward water flow in several locations within nitrification zone 1 impacts the floating packing material, causing it to move downwards along the inclined mesh cages. After leaving the downward water flow area, the packing material floats back up along the side wall of the mesh cage, re-enters the downward water flow area, and is swept down again. This process repeats, ensuring that the packing material within the mesh cages is evenly distributed both horizontally and vertically.

[0040] Based on the characteristics of wastewater flow (combining horizontal and vertical directions) within the nitrification zone 1, this invention selects different biological carriers. The loaded particles, due to their relatively large weight, are not easily placed in the upper part of the water body; therefore, they are arranged in layers within the lower carrier section 6, allowing for horizontal movement and passive, uniform distribution. The loaded packing material, with its smaller weight, is also not easily placed in the lower part of the water body; therefore, it is arranged laterally in sections within the upper carrier section 7, allowing for uniform distribution within the carrier section 7 under the influence of downward water flow and buoyancy.

[0041] Optionally, the structure of the carrier section 3 8 is the same as that of the carrier section 2 7. The carrier section 3 8 includes several inclined square mesh cages connected end to end. The carrier section 3 8 is placed horizontally so that the carrier section 3 8 forms a corrugated shape with crests and troughs. The crests are close to the liquid surface of the denitrification zone 2, and the troughs are close to the bottom of the denitrification zone 2.

[0042] The water-facing surface of the mesh cage in carrier section 38 is a perforated plate, which facilitates the sliding of sludge in the sewage along the perforated plate and promotes sludge-water separation. The through holes on the perforated plate are distributed in a matrix, with gaps between the two vertical rows of through holes, which serve as channels for the sludge to slide down. The other sides of the mesh cage in carrier section 38 are mesh surfaces, and the diameter of the through holes and the mesh holes in the perforated plate are both larger than the particle size of the loaded particles inside carrier section 38.

[0043] Optionally, the carrier section 3 8 is provided with a horizontally arranged central shaft 9 in the middle. One end of the central shaft 9 is rotatably connected to the upstream side wall of the denitrification zone 2, and the other end passes through the downstream side wall and is then connected to a motor. The central shaft 9 passes through the middle of all the mesh cages of the carrier section 3 8. The motor drives the carrier section 3 8 to rotate through the central shaft 9, which is conducive to the uniform distribution of the internal biological load packing and biological load particles.

[0044] Optionally, the bottom of the denitrification zone 2 is provided with a sludge discharge port, which is connected to the sludge treatment device inside the ship through a pipe. After the ship docks, the sludge is cleaned up.

[0045] Sulfur autotrophic technology produces little or no sludge. However, the raw water in this invention is sewage directly from rivers or other bodies of water, which will carry some sludge. Additionally, a small amount of sludge may be present when the raw water quality fluctuates or during abnormal operation. In the denitrification zone 2, the sewage flows laterally through the carrier section 3 8. The sludge in the water slides down along the sliding channels of the perforated plate. Furthermore, because the carrier section 3 8 has multiple mesh cages, it is essentially a multi-layered sludge-water separation inclined plate, resulting in good sludge-water separation. The packing material in the carrier section 3 8 floats while the particles sink. This invention utilizes this characteristic by placing the packing material and particles together and then rotating the carrier section 3 8. The packing material and particles continuously float and sink, constantly changing their position within the mesh cages. The constant relative movement of the packing material and particles achieves good mixing, promoting thorough contact between the sewage and microorganisms and improving treatment efficiency.

[0046] Photovoltaic cells are installed on the top or side of the vessel or sulfur autotrophic treatment tank to power the drive unit, motor and airlift device.

Claims

1. A solar-powered autotrophic denitrification vessel for in-situ denitrification of river water, characterized in that, The system includes an air-lift device, a nitrification zone, a denitrification zone, and solar panels, all mounted on the ship. The air-lift device is connected to a main air-lift pipe and several branch air-lift pipes. The upstream side of the nitrification zone is connected to a water inlet pipe, the inlet of which is near the propeller at the stern of the ship. The main air-lift pipe is connected to the bottom of the water inlet pipe and is used for air-lifting water. Several branch air-lift pipes are evenly distributed within the nitrification zone and are used to lift wastewater to the upper part of the nitrification zone, forming a vertical water flow that complements the original horizontal water flow in the nitrification zone. The lower part of the nitrification zone is provided with several carrier sections 1 that can move horizontally. The carrier sections 1 are filled with biological load particles. The upper part of the nitrification zone is provided with corrugated carrier sections 2, which are filled with biological load packing. The denitrification zone is equipped with a corrugated carrier section three, which is filled with biological load packing material and biological load particles. The sides of the carrier section three facing the upstream side of the denitrification zone are all perforated plates, while the sides facing the downstream side of the denitrification zone are all mesh surfaces. The mesh surfaces can reduce the resistance of wastewater passing through the carrier section three.

2. The solar-powered autotrophic denitrification vessel for in-situ denitrification of river water according to claim 1, characterized in that, The vessel is equipped with a square sulfur autotrophic treatment tank and a gas source, which is connected to the main gas lift pipe and the branch gas lift pipe. The sulfur autotrophic treatment tank is equipped with a nitrification zone and a denitrification zone in sequence. The top of one end of the sulfur autotrophic treatment tank is connected to a water inlet pipe, and the top of the other end is equipped with a water outlet pipe to discharge the treated water into the river. A partition plate is provided between the nitrification zone and the denitrification zone. A water passage hole is provided in the middle of the partition plate to input the water treated in the nitrification zone into the denitrification zone.

3. The solar-powered autotrophic denitrification vessel for in-situ denitrification of river water according to claim 1, characterized in that, The plurality of gas-lifting pipes are evenly arranged along the length of the nitration zone, with the bottom of the gas-lifting pipes at the bottom of the nitration zone and the top of the gas-lifting pipes above the liquid surface of the nitration zone. Several gas distribution pipes are arranged in a row, and a row of biochemical load components are set on both sides of the gas distribution pipes. The biochemical load components include several carrier parts stacked one above the other, and the carrier part one is a square mesh cage. The bottom of the carrier section 1 is slidably connected to a track, which is parallel to the length direction of the nitration zone. A drive device is provided on the upstream or downstream side of the nitration zone to drive the carrier section 1 to move back and forth along the track.

4. The solar-powered autotrophic denitrification vessel for in-situ denitrification of river water according to claim 3, characterized in that, A driving device is provided on the upstream side of the nitrification zone, corresponding to the middle position of each biochemical load component, and a driving device is provided on the downstream side of the nitrification zone, corresponding to the middle position of each biochemical load component. In a biochemical load assembly, two adjacent carrier sections are respectively connected to two driving devices corresponding to the biochemical load assembly, and one driving device is connected in parallel to several carrier sections.

5. The solar-powered autotrophic denitrification vessel for in-situ denitrification of river water according to claim 1, characterized in that, The carrier section is a long, flat, square mesh cage. The top surface of the carrier section is evenly distributed with undulating troughs and crests. The troughs and crests are alternately arranged in both the horizontal and vertical directions of the top surface. The other sides of the carrier section are flat.

6. The solar-powered autotrophic denitrification vessel for in-situ denitrification of river water according to claim 1, characterized in that, The second carrier section includes several inclined square mesh cages connected end to end. The second carrier section is placed horizontally so that the second carrier section forms a corrugated shape with crests and troughs. The crests are close to the liquid surface of the nitration zone, and the troughs are close to the uppermost carrier section. The bio-loaded packing material is made of plastic or fiber, and the walls of the packing are loaded with microbial films, which can carry out biochemical treatment of sewage.

7. The solar-powered autotrophic denitrification vessel for in-situ denitrification of river water according to claim 1, characterized in that, The structure of the third carrier section is the same as that of the second carrier section. The third carrier section includes several inclined square mesh cages connected end to end. The third carrier section is placed horizontally so that the third carrier section forms a corrugated shape with crests and troughs. The crests are close to the liquid surface of the denitrification zone, and the troughs are close to the bottom of the denitrification zone. The water-facing surface of the cage in the third carrier section is a perforated plate, which facilitates the sliding of sludge in the sewage along the perforated plate; the other sides of the cage in the third carrier section are mesh surfaces.

8. The solar-powered autotrophic denitrification vessel for in-situ denitrification of river water according to claim 7, characterized in that, The third carrier section has a horizontally set central shaft in the middle. One end of the central shaft is rotatably connected to the upstream side wall of the denitrification zone, and the other end passes through the downstream side wall and is connected to a motor. The central shaft runs through the middle of all the mesh cages in the third carrier section. The motor drives the third carrier section to rotate through the central shaft, which is conducive to the uniform distribution of the internal biological load packing and biological load particles.

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