High-efficiency nitrogen and phosphorus removal device suitable for high-nitrogen and high-phosphorus sewage

Abstract

The utility model belongs to wastewater treatment technical field, especially suitable for high nitrogen phosphorus sewage's high -efficient denitrification and phosphorus removal device of high nitrogen phosphorus, it solves the problem of unable to realize resource recovery. The high -efficient denitrification and phosphorus removal device suitable for high nitrogen phosphorus sewage, include: pretreatment pool, be used for filtering suspended impurities in wastewater, anoxic pool is connected with the effluent of pretreatment pool, is used for denitrification, anaerobic tank is connected with the effluent of anoxic pool, is used for release phosphorus, aerobic tank is connected with the effluent of anaerobic tank, is used for nitrification reaction and phosphorus absorption, and its effluent is connected to anoxic pool through reflux pipe, sedimentation tank is connected with the sludge outlet of aerobic tank, is used for mud -water separation, and the sludge outlet is connected with anaerobic tank through reflux pipe, phosphorus recovery tank is connected with the supernatant outlet of sedimentation tank, is used for getting the precipitated guano through adding magnesium source, and the mixed liquid containing guano is discharged through final discharge port. The effect that phosphorus is recycled in the form of guano is realized, and it is favorable for improving economy.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and specifically relates to a high-efficiency nitrogen and phosphorus removal device suitable for high-nitrogen and phosphorus wastewater. Background Technology

[0002] Rural domestic sewage often contains high levels of nitrogen and phosphorus. The treatment of high-nitrogen and high-phosphorus sewage is crucial to the protection of the rural water environment and the safety of water use.

[0003] Existing technologies disclose a variety of wastewater denitrification and phosphorus removal devices and methods. However, most denitrification and phosphorus removal systems cannot recover phosphorus from the wastewater, thus failing to achieve the goal of wastewater resource utilization, and their effectiveness needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a highly efficient nitrogen and phosphorus removal device suitable for high-nitrogen and high-phosphorus wastewater.

[0005] To achieve the innovative objectives of this utility model, the following technical solutions can be used:

[0006] A high-efficiency nitrogen and phosphorus removal device suitable for high-nitrogen and high-phosphorus wastewater includes:

[0007] Pretreatment tank, used to filter out suspended impurities in wastewater;

[0008] The anoxic tank is connected to the outlet of the pretreatment tank and is used for denitrification.

[0009] The anaerobic tank is connected to the outlet of the anoxic tank and is used for phosphorus release.

[0010] The aerobic tank is connected to the outlet of the anaerobic tank and is used for nitrification and phosphorus absorption. Its outlet is connected to the anoxic tank through the nitrified liquid return pipe.

[0011] The sedimentation tank is connected to the sludge outlet of the aerobic tank for sludge-water separation. The bottom sludge outlet is connected to the anaerobic tank through a sludge return pipe.

[0012] The phosphorus recovery tank is connected to the supernatant outlet of the sedimentation tank. It is used to obtain precipitated struvite by adding a magnesium source and to discharge the struvite-containing mixture through the final discharge outlet.

[0013] This utility model's denitrification and phosphorus removal device is used to treat high-nitrogen and high-phosphorus wastewater. Its pretreatment tank is used to filter solid impurities from the wastewater before treatment, preventing them from affecting subsequent treatment processes. The anoxic, anaerobic, and aerobic tanks are used for denitrification and phosphorus removal using the AAO process. The nitrification liquid in the upper layer of the aerobic tank contains a large number of nitrifying bacteria. Returning this nitrification liquid to the upstream anoxic tank helps compensate for the denitrifying bacteria discharged with the wastewater, ensuring the denitrification effect. The sedimentation tank receives the sludge-water mixture from the bottom of the aerobic tank. In the sedimentation tank, the sludge and water are separated; the upper part is a phosphorus-rich supernatant, and the lower part is bottom sludge containing a large number of phosphorus-releasing bacteria. This bottom sludge is returned to the anaerobic tank through a sludge return pipe to replenish the phosphorus-releasing bacteria. Of course, this replenishment does not necessarily involve returning all the bottom sludge; a portion can be returned, and the remaining bottom sludge is discharged and collected. The phosphorus recovery tank is used for specific chemical crystallization treatment of the phosphorus-rich supernatant. After adjusting the pH, a magnesium source (such as magnesium chloride) is added to obtain MgNH4PO4·6H2O precipitate, i.e., struvite, which can be used as phosphate fertilizer, achieving the purpose of resource utilization. The clarified water after sedimentation can be discharged as the final discharge. This clarified water undergoes multiple cycles of A2O treatment, achieving thorough denitrification and phosphorus removal. Of course, it is common knowledge that on / off valves are installed at the effluent outlets of the pretreatment tank, anoxic tank, and anaerobic tank, the sludge outlet of the aerobic tank, the bottom sludge outlet and supernatant outlet of the sedimentation tank, the final discharge outlet of the phosphorus recovery tank, the nitrification liquor return pipe, and the sludge return pipe.

[0014] In the above-mentioned high-efficiency nitrogen and phosphorus removal device suitable for high nitrogen and phosphorus wastewater, the device includes a device body, which contains a pretreatment tank, an anoxic tank, an anaerobic tank, an aerobic tank, a sedimentation tank, and a phosphorus recovery tank arranged from top to bottom.

[0015] The device has a vertical structure, and its interior is integrated with a pretreatment tank, anoxic tank, anaerobic tank, aerobic tank, sedimentation tank and phosphorus recovery tank. Moreover, each tank is arranged from top to bottom according to the direction of the treatment process, and the corresponding flow can be achieved between adjacent tanks by gravity flow, which reduces the power cost of transfer.

[0016] In the above-mentioned high-efficiency nitrogen and phosphorus removal device suitable for high nitrogen and phosphorus wastewater, the pretreatment tank, anoxic tank, anaerobic tank, aerobic tank, sedimentation tank and phosphorus recovery tank are arranged in an S-shape. The pretreatment tank, anoxic tank and aerobic tank are vertically adjacent to each other, and the anoxic tank, aerobic tank and phosphorus recovery tank are vertically adjacent to each other and staggered from the pretreatment tank, anoxic tank and aerobic tank.

[0017] The tanks are arranged in an S-shape, with adjacent tanks side-by-side and intermittent tanks vertically adjacent. Downstream tanks are lower than upstream tanks, ensuring effective gravity flow transfer. The overall layout is compact and efficient. Furthermore, the two groups of tanks with backflow are vertically adjacent, which helps reduce the consumption of backflow force compared to a vertically arranged line of tanks.

[0018] In the above-mentioned high-efficiency nitrogen and phosphorus removal device suitable for high nitrogen and phosphorus wastewater, a filter screen is detachably installed at the top of the pretreatment tank, and a pretreatment sedimentation zone is provided at the bottom. The outlet of the pretreatment tank is located between the pretreatment sedimentation zone and the filter screen. A flow stabilizing baffle with a grid-like cross-section and extending vertically is detachably installed in the pretreatment sedimentation zone. A sludge discharge port is provided at the bottom of the pretreatment tank, and the bottom of the flow stabilizing baffle is not connected to the bottom of the tank.

[0019] The filter screen is used to remove larger particulate impurities from the wastewater. Its outer periphery rests on a protrusion on the pool wall, allowing for flexible and removable installation and easy cleaning of the filtered impurities. The sedimentation zone is used for simple sedimentation of the wastewater, reducing the transport of small-diameter impurities to subsequent treatment processes. Furthermore, a flow-stabilizing baffle is installed in the pretreatment sedimentation zone. This baffle has a grid-like cross-section with vertically extending mesh openings, reducing the impact on the sedimentation zone during wastewater input and improving the sedimentation rate and effectiveness. A gap exists between the lower end of the flow-stabilizing baffle and the pool bottom, with the sludge discharge port located on the sidewall of this gap, ensuring smooth discharge of bottom sediment.

[0020] In the above-mentioned high-efficiency nitrogen and phosphorus removal device suitable for high nitrogen and phosphorus wastewater, the anoxic tank is equipped with denitrification packing material, the anaerobic tank is equipped with phosphorus release packing material, and the aerobic tank is equipped with composite packing material for nitrification and phosphorus uptake.

[0021] The anoxic, anaerobic, and aerobic tanks are equipped with corresponding packing materials to treat wastewater through denitrification, nitrification, phosphorus release, and phosphorus uptake. As a feasible specific solution, the denitrification packing material includes suspended biological ropes inoculated with denitrifying bacteria, which have a high specific surface area. The phosphorus release packing material includes hydrophobic-treated sheet-like PVC packing material, which has a low bio-attachment density after inoculation with phosphorus-releasing bacteria, avoiding excessive consumption of organic matter. This packing material can be installed via a vertical slot. The composite packing material includes a three-dimensional mesh biological rope inoculated with nitrifying bacteria, and suspended ball packing material connected to the lower end of the three-dimensional mesh biological rope and inoculated with phosphorus-absorbing bacteria. The nitrifying bacteria are located in the upper high-oxygen zone, and the high specific surface area of ​​the three-dimensional mesh biological rope is conducive to their growth. The phosphorus-absorbing bacteria are located in the lower low-oxygen zone, and the interior of the suspended ball packing material is an anaerobic environment, which is conducive to their growth. The specific selection of bacterial strains and treatment methods for biofilm wastewater treatment are common knowledge and existing technology, and will not be elaborated here.

[0022] In the above-mentioned high-efficiency nitrogen and phosphorus removal device suitable for high nitrogen and phosphorus wastewater, the bottom of the aerobic tank is inclined to the side away from the sedimentation tank, and the sludge outlet of the aerobic tank is located on the lower side; the bottom of the sedimentation tank is inclined to the side away from the phosphorus recovery tank, the bottom sludge outlet of the sedimentation tank is located on the lower side of the bottom, and the supernatant outlet is located on the higher side; the bottom sludge outlet is also provided with a discharge port for discharging excess sludge.

[0023] The bottom of the aerobic tank is lower on the side closest to the sedimentation tank, where sediment mainly accumulates. The bottom of the sedimentation tank is also sloped, with the side furthest from the phosphorus recovery tank (i.e., the outer side) being the lower side. The bottom sludge outlet on the lower side is connected to the anaerobic tank to return some sludge, and can also discharge the remaining bottom sludge through the discharge outlet.

[0024] In the above-mentioned high-efficiency nitrogen and phosphorus removal device suitable for high nitrogen and phosphorus wastewater, the bottom of the phosphorus recovery tank is inclined to the side away from the sedimentation tank, the sedimentation tank is provided with a struvite filter structure connected to the final discharge outlet below, and the sedimentation tank is provided with a feeding port on the side wall.

[0025] The bottom of the phosphorus recovery tank is sloped to facilitate the discharge of liquid and struvite. The feed inlet is used to add magnesium source and corresponding pH adjuster, and also to facilitate observation of the tank. The struvite filtration structure is attached to the lower side of the phosphorus recovery tank, which can filter the liquid containing struvite discharged from the phosphorus recovery tank to achieve struvite recovery. The liquid is discharged last. Moreover, the struvite filtration structure is located below the sedimentation tank, making the overall structure more compact.

[0026] In the above-mentioned high-efficiency nitrogen and phosphorus removal device for high-nitrogen and high-phosphorus wastewater, the struvite filtration structure includes an inclined discharge channel connected to the final discharge port. The discharge channel is cut off by a trapping net that struvite cannot pass through. The trapping net is detachably connected to the discharge channel and can move relative to the bottom surface of the discharge channel.

[0027] The final discharge outlet is located on the side of the phosphorus recovery tank near the sedimentation tank. The discharge channel is connected to the final discharge outlet, and its inclination direction matches the inclination direction of the bottom of the phosphorus recovery tank. The liquid containing struvite discharged from the final discharge outlet flows downward along the discharge channel, where a trapping net is used to trap the struvite. The trapping net is detachably installed inside the discharge channel for easy installation and removal.

[0028] In the above-mentioned high-efficiency nitrogen and phosphorus removal device suitable for high nitrogen and phosphorus wastewater, the side wall of the discharge channel is provided with a slot, the intercepting net is clamped in the slot, the intercepting net is inclined, and the direction of the clutch movement does not intersect with the bottom of the sedimentation tank.

[0029] The intercepting net is slidably connected to the slots on both sides. The extension direction of the slots is roughly perpendicular to the length direction of the discharge channel. The intercepting net can be pulled along the slots and tends to contact the bottom surface of the discharge channel. When the bottom of the intercepting net contacts the bottom of the discharge channel, the struvite is blocked by the net, and the liquid is discharged smoothly. This liquid is the effluent that meets the standards after nitrogen and phosphorus removal. When the liquid has been drained and struvite needs to be collected, the intercepting net can be pulled up, and its bottom is released from contact with the bottom surface of the discharge channel. At this time, the struvite will slide down the slope for easy recycling. Moreover, the extension direction of the slots does not intersect with the bottom surface of the sedimentation tank above, making it easy to completely pull out and remove the intercepting net.

[0030] In the above-mentioned high-efficiency nitrogen and phosphorus removal device suitable for high-nitrogen and phosphorus wastewater, the phosphorus recovery tank is provided with a feeding port on the side away from the sedimentation tank, and a T-shaped stirring rod is provided in the phosphorus recovery tank. The hand grip end of the stirring rod extends out from the feeding port, and the stirring section at the front end of the stirring rod can reciprocate along the inclined direction of the inclined bottom surface of the phosphorus recovery tank; the nitrification liquid return pipe and the sludge return pipe are respectively connected to a power pump assembly; and an aeration assembly is provided at the bottom of the aerobic tank.

[0031] The feed inlet is located on the side furthest from the sedimentation tank. A stirring rod is used for timely and simple stirring to ensure smooth reaction. The handle of the stirring rod extends from the feed inlet for easy operation by management personnel. The stirring section is perpendicular to the slope of the phosphorus recovery tank bottom. By operating the handle, the stirring section can be moved back and forth along the slope of the tank bottom, achieving efficient stirring. A power pump assembly provides the power required for reflux, while the aeration assembly is used to aerate the aerobic tank, ensuring an aerobic environment inside.

[0032] As an optimization, a solar panel is installed above the anoxic pool to provide power to the power pump assembly and aeration assembly.

[0033] Compared with the prior art, the present invention has the following main advantages:

[0034] 1. The anoxic, anaerobic, and aerobic tanks are used for nitrogen and phosphorus removal treatment of wastewater using the AAO process. The nitrifying liquor in the upper layer of the aerobic tank contains a large number of nitrifying bacteria. Returning this nitrifying liquor to the upstream anoxic tank helps compensate for the denitrifying bacteria discharged with the wastewater, ensuring effective denitrification. The sedimentation tank receives the sludge-water mixture from the bottom of the aerobic tank. In the sedimentation tank, the sludge and water are separated; the upper part is a phosphorus-rich supernatant, and the lower part is bottom sludge containing a large number of phosphorus-releasing bacteria. This bottom sludge is returned to the anaerobic tank through a sludge return pipe to replenish the phosphorus-releasing bacteria. The phosphorus recovery tank is used for specific chemical crystallization treatment of the phosphorus-rich supernatant, recovering phosphorus in the form of struvite. The clarified water after sedimentation is the final discharge. This clarified water undergoes multiple cycles of A2O treatment, resulting in thorough nitrogen and phosphorus removal.

[0035] 2. The main body of the device has a vertical structure, and its interior is integrated with a pretreatment tank, anoxic tank, anaerobic tank, aerobic tank, sedimentation tank and phosphorus recovery tank. Moreover, each tank is arranged from top to bottom according to the direction of the treatment process, and the corresponding flow can be achieved between adjacent tanks through gravity flow, thereby reducing power costs.

[0036] 3. The tanks are arranged in an S-shape, with adjacent tanks side-by-side and intermittent tanks vertically adjacent, resulting in a compact and rational overall layout. Furthermore, the two sets of tanks with backflow are vertically adjacent, which helps to further reduce the consumption of backflow force.

[0037] 4. A flow stabilizing baffle is installed in the pretreatment sedimentation zone to reduce the impact on the sedimentation zone when wastewater is input, thereby improving the sedimentation rate and effect. Moreover, there is a gap between the lower end of the flow stabilizing baffle and the bottom of the tank, and the sludge discharge port is located on the side wall of this gap, ensuring that the bottom sediment is discharged smoothly from the sludge discharge port.

[0038] 5. The bottom of the phosphorus recovery tank is sloped to facilitate the discharge of liquid and struvite. The feed inlet is used to add magnesium source and corresponding pH adjuster, and it is also easy to observe the situation inside the tank. The struvite filter structure is connected to the lower side of the phosphorus recovery tank, which can filter the liquid containing struvite discharged from the phosphorus recovery tank to achieve struvite recovery. The liquid is discharged last. Moreover, the struvite filter structure is located below the sedimentation tank, making the overall structure more compact.

[0039] 6. The two sides of the interception net are slidably connected in the slot. The extension direction of the slot is roughly perpendicular to the length direction of the discharge channel. The interception net can be pulled along the slot. Moreover, the extension direction of the slot does not intersect with the bottom surface of the sedimentation tank above, making it easy to pull out and remove the interception net completely.

[0040] 7. The handle of the stirring rod extends from the feeding port for easy operation by management personnel. The stirring section is perpendicular to the inclined direction of the bottom of the phosphorus recovery tank. By operating the handle, the stirring section can be moved back and forth along the inclined direction of the bottom of the tank, achieving a simple and effective stirring effect. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall structure provided by this utility model.

[0042] In the diagram, the components are: 1. Pretreatment tank; 2. Anoxic tank; 3. Anaerobic tank; 4. Aerobic tank; 5. Nitrified liquid return pipe; 6. Sedimentation tank; 7. Sludge outlet; 8. Bottom sludge outlet; 9. Sludge return pipe; 10. Supernatant outlet; 11. Phosphorus recovery tank; 12. Final discharge outlet; 13. Main unit; 14. Filter grid; 15. Pretreatment sedimentation zone; 16. Flow stabilizing baffle; 17. Sludge discharge outlet; 18. Discharge branch outlet; 19. Strutstone filter structure; 20. Feeding port; 21. Discharge channel; 22. Interception net; 23. Slot; 24. Solar panel; 25. Stirring rod; 26. Hand grip; 27. Stirring section; 28. Aeration component. Detailed Implementation

[0043] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0044] Specific implementation examples Figure 1 As shown, this high-efficiency nitrogen and phosphorus removal device for high-nitrogen and phosphorus wastewater includes: a pretreatment tank 1 for filtering suspended impurities in the wastewater; an anoxic tank 2 connected to the outlet of the pretreatment tank 1 for denitrification; an anaerobic tank 3 connected to the outlet of the anoxic tank 2 for phosphorus release; an aerobic tank 4 connected to the outlet of the anaerobic tank 3 for nitrification and phosphorus absorption, with its outlet connected to the anoxic tank 2 via a nitrification liquid return pipe 5; a sedimentation tank 6 connected to the sludge outlet 7 of the aerobic tank 4 for sludge-water separation, with the bottom sludge outlet 8 connected to the anaerobic tank 3 via a sludge return pipe 9; and a phosphorus recovery tank 11 connected to the supernatant outlet 10 of the sedimentation tank 6 for obtaining precipitated struvite by adding a magnesium source, and discharging the struvite-containing mixed liquid through the final discharge outlet 12.

[0045] Specifically, this denitrification and phosphorus removal device is used to treat high-nitrogen and high-phosphorus wastewater. Its pretreatment tank 1 is used for initial solid impurity filtration of the wastewater to avoid affecting subsequent treatment processes. The anoxic tank 2, anaerobic tank 3, and aerobic tank 4 are used for denitrification and phosphorus removal of the wastewater using the AAO process. Furthermore, the nitrification liquid in the upper layer of aerobic tank 4 contains a large number of nitrifying bacteria. Returning this nitrification liquid to the upstream anoxic tank 2 helps compensate for the denitrifying bacteria discharged with the wastewater, ensuring the denitrification effect. The sedimentation tank 6 receives the sludge-water mixture from the bottom of aerobic tank 4. In the sedimentation tank 6, the sludge and water are separated; the upper part is a phosphorus-rich supernatant, and the lower part is bottom sludge containing a large number of phosphorus-releasing bacteria. This bottom sludge is returned to anaerobic tank 3 through the sludge return pipe 9 to replenish the phosphorus-releasing bacteria. Of course, this replenishment does not necessarily involve returning all the bottom sludge; a portion can be returned, and the remaining bottom sludge is discharged and collected. Phosphorus recovery tank 11 is used for specific chemical crystallization treatment of phosphorus-rich supernatant. After adjusting the pH, a magnesium source (specifically magnesium chloride) is added to obtain MgNH4PO4•6H2O precipitate, i.e., struvite, which can be used as phosphate fertilizer, thus achieving the purpose of resource utilization. The clear water after sedimentation can be discharged through the final discharge outlet 12. This clear water undergoes multiple cycles of A2O treatment, achieving thorough denitrification and phosphorus removal.

[0046] like Figure 1 As shown, in the above-mentioned high-efficiency nitrogen and phosphorus removal device suitable for high-nitrogen and phosphorus wastewater, the device includes a main body 13. Within the main body 13, a pretreatment tank 1, an anoxic tank 2, an anaerobic tank 3, an aerobic tank 4, a sedimentation tank 6, and a phosphorus recovery tank 11 are arranged in an S-shape from top to bottom. The pretreatment tank 1, anoxic tank 2, and aerobic tank 4 are vertically adjacent, while the anoxic tank 2, aerobic tank 4, and phosphorus recovery tank 11 are vertically adjacent but staggered from the pretreatment tank 1, anoxic tank 2, and aerobic tank 4.

[0047] Specifically, the main body 13 of the device has a vertical structure, and its interior integrally comprises a pretreatment tank 1, an anoxic tank 2, an anaerobic tank 3, an aerobic tank 4, a sedimentation tank 6, and a phosphorus recovery tank 11. The tanks are arranged from top to bottom according to the treatment flow direction, allowing for flow between adjacent tanks via gravity, thus reducing the power cost of transfer. The tanks are arranged in an S-shape, with adjacent tanks side-by-side and intermittent tanks side-by-side, and downstream tanks lower than upstream tanks, ensuring effective transfer via gravity. The overall layout is compact and rational. Furthermore, the two sets of tanks with reflux are vertically adjacent, which helps reduce the power consumption of reflux flow.

[0048] As an optimization of this embodiment, a filter grid 14 is detachably installed on the upper part of the pretreatment tank 1, and a pretreatment sedimentation zone 15 is provided at the bottom. The outlet of the pretreatment tank 1 is located between the pretreatment sedimentation zone 15 and the filter grid 14. A flow stabilizing baffle 16 with a grid-like cross-section and extending vertically is detachably installed in the pretreatment sedimentation zone 15. A sludge discharge port 17 is provided at the bottom of the pretreatment tank 1, and the bottom of the flow stabilizing baffle 16 is not connected to the bottom of the tank.

[0049] Specifically, the filter screen 14 is used to filter out larger particulate impurities in the wastewater. The outer periphery of the filter screen 14 rests on a protrusion on the pool wall. This installation method allows for flexible disassembly, facilitating the cleaning of filtered impurities. The pretreatment sedimentation zone 15 is used for simple sedimentation of the wastewater, reducing the transport of small-diameter impurities to subsequent treatment processes. Furthermore, a flow stabilizing baffle 16 is installed within the pretreatment sedimentation zone 15. The cross-section of the flow stabilizing baffle 16 is mesh-like, with each mesh extending vertically. This reduces the impact on the pretreatment sedimentation zone 15 during wastewater input, improving the sedimentation rate and effect. A gap exists between the lower end of the flow stabilizing baffle 16 and the pool bottom, and the sludge discharge port 17 is located on the side wall of this gap, ensuring that the bottom sediment is smoothly discharged from the sludge discharge port 17.

[0050] In this embodiment, the anoxic tank 2 is equipped with denitrifying packing material, the anaerobic tank 3 is equipped with phosphorus-releasing packing material, and the aerobic tank 4 is equipped with composite packing material for nitrification and phosphorus uptake. The denitrifying packing material includes suspended biological ropes inoculated with denitrifying bacteria, which have a high specific surface area. The phosphorus-releasing packing material includes sheet-like PVC packing material with a hydrophobic surface treatment. After inoculation with phosphorus-releasing bacteria, its biological attachment density is low, avoiding excessive consumption of organic matter. This packing material can be installed via a vertical slot. The composite packing material includes a three-dimensional mesh biological rope inoculated with nitrifying bacteria, and suspended ball packing material connected to the lower end of the three-dimensional mesh biological rope and inoculated with phosphorus-uptake bacteria. The three-dimensional mesh biological rope is fixed to the top of the tank through a frame mesh. The nitrifying bacteria are located in the upper high-oxygen zone, and the high specific surface area of ​​the three-dimensional mesh biological rope is conducive to the growth of nitrifying bacteria. The phosphorus-uptake bacteria are located in the lower low-oxygen zone, and the interior of the suspended ball packing material is an anaerobic environment, which is conducive to the growth of phosphorus-uptake bacteria. The packing material is not specifically shown in the accompanying drawings.

[0051] As an optimization of this embodiment, the bottom of the aerobic tank 4 is inclined to the side away from the sedimentation tank 6, and the sludge outlet 7 of the aerobic tank 4 is located on the low side; the bottom of the sedimentation tank 6 is inclined to the side away from the phosphorus recovery tank 11, the bottom sludge outlet 8 of the sedimentation tank 6 is located on the low side of the bottom, and the supernatant outlet 10 is located on the high side; the bottom sludge outlet 8 is also provided with a discharge outlet 18 for discharging the remaining sludge.

[0052] Specifically, the bottom of aerobic tank 4 is lower on the side near sedimentation tank 6, where sediment mainly accumulates. The bottom of sedimentation tank 6 is also sloped, with the side furthest from phosphorus recovery tank 11 being the lower side. The bottom sludge outlet 8 is connected to anaerobic tank 3 on one hand to return and transport some sludge, and on the other hand, it can discharge the remaining bottom sludge through discharge outlet 18.

[0053] like Figure 1 As shown, the bottom of the phosphorus recovery tank 11 is inclined away from the sedimentation tank 6. Below the sedimentation tank 6 is a struvite filtration structure 19 connected to the final discharge port 12. A feeding port 20 is located on the side wall of the sedimentation tank 6. The struvite filtration structure 19 includes an inclined discharge channel 21 connected to the final discharge port 12. The discharge channel 21 is cut off by a trapping net 22 that prevents struvite from passing through. The trapping net 22 is detachably connected to the discharge channel 21 and can move relative to the bottom surface of the discharge channel 21. A slot 23 is provided on the side wall of the discharge channel 21, and the trapping net 22 is engaged in the slot 23. The trapping net 22 is inclined, and its movement direction does not intersect with the bottom of the sedimentation tank 6.

[0054] Specifically, the bottom of the phosphorus recovery tank 11 is sloped to facilitate the discharge of liquid and struvite. The feed inlet 20 is used to add a magnesium source and corresponding pH adjuster, and also facilitates observation of the tank's contents. The struvite filtration structure 19 is attached to the lower side of the phosphorus recovery tank 11, filtering the liquid containing struvite discharged from the tank and recovering the struvite. The liquid is discharged last. Furthermore, the struvite filtration structure 19 is located below the sedimentation tank 6, making the overall structure more compact. The discharge channel 21 is connected to the final discharge outlet 12, and its slope direction matches the slope direction of the bottom of the phosphorus recovery tank 11. The liquid containing struvite discharged from the final discharge outlet 12 flows downwards along the discharge channel 21, where a trapping net 22 traps the struvite. The trapping net 22 is detachably installed within the discharge channel 21 for easy assembly and disassembly. The intercepting net 22 is slidably connected to the slots 23 on both sides. The extension direction of the slots 23 is approximately perpendicular to the length direction of the discharge channel 21. The intercepting net 22 can be pulled along the slots 23 and tends to contact the bottom surface of the discharge channel 21. When the bottom of the intercepting net 22 contacts the bottom of the discharge channel 21, the struvite is blocked by the intercepting net 22, and the liquid is discharged smoothly. This liquid is the effluent that meets the standards after nitrogen and phosphorus removal. When the liquid is drained and struvite needs to be collected, the intercepting net 22 can be pulled up, and its bottom will be released from contact with the bottom surface of the discharge channel 21. At this time, the struvite will slide down the slope for easy recycling. Moreover, the extension direction of the slots 23 does not intersect with the bottom surface of the sedimentation tank 6 above, making it easy to completely pull out and remove the intercepting net 22.

[0055] As an optimization of this embodiment, a feeding port 20 is provided on the side of the phosphorus recovery tank 11 away from the sedimentation tank 6. A T-shaped stirring rod 25 is provided inside the phosphorus recovery tank 11, with the handle 26 of the stirring rod 25 extending from the feeding port 20. The stirring section 27 at the front end of the stirring rod 25 can reciprocate along the inclined direction of the inclined bottom surface of the phosphorus recovery tank 11. The nitrification liquid return pipe 5 and the sludge return pipe 9 are respectively connected to a power pump assembly. An aeration assembly 28 is provided at the bottom of the aerobic tank 4. A solar panel 24 is provided above the anoxic tank 2, which can provide power to the power pump assembly and the aeration assembly 28.

[0056] Specifically, the feeding port 20 is located on the side away from the sedimentation tank 6. The stirring rod 25 is used for timely simple stirring to ensure the smooth progress of the reaction. The handle 26 of the stirring rod 25 extends from the feeding port 20 for easy operation by management personnel. The stirring section 27 is perpendicular to the inclined direction of the bottom of the phosphorus recovery tank 11. By operating the handle, the stirring section 27 can be moved back and forth along the inclined direction of the bottom of the tank to achieve a high-efficiency stirring effect. The power pump assembly is used to provide the power required for the reflux, and the aeration assembly 28 is used to aerate the aerobic tank 4 to ensure the internal aerobic environment.

[0057] Specific working principle: Wastewater enters from the top opening of pretreatment tank 1, passes through filter screen 14, and enters pretreatment sedimentation zone 15. Filter screen 14 removes large-particle impurities. After standing in pretreatment sedimentation zone 15 for a certain period of time, the outlet of pretreatment tank 1 opens, and the wastewater flows to anoxic tank 2. Denitrifying bacteria in anoxic tank 2 denitrify the wastewater. After a certain period of time, the outlet opens, and the wastewater flows to anaerobic tank 3. Phosphorus-releasing bacteria in anaerobic tank 3 release phosphorus from the wastewater. After a certain period of time, the outlet opens, and the wastewater flows to aerobic tank 4. Phosphorus-absorbing bacteria and nitrifying bacteria in aerobic tank 4 absorb phosphorus and nitrify the wastewater. After a certain period of time, the nitrified liquid return pipe 5 opens, and the power pump assembly returns the nitrified liquid to anoxic tank 2 for circulation treatment. At the same time, the sludge outlet 7 opens, and the sludge-water mixture at the bottom of aerobic tank 4 flows into sedimentation tank 6. Sedimentation tank 6 further settles the sludge-water mixture. After a period of time... The supernatant outlet 10 is opened, and the supernatant flows into the phosphorus recovery tank 11. At the same time, the sludge return pipe 9 is opened, and the power pump assembly returns part of the bottom sludge to the anaerobic tank 3. A pH adjuster and a magnesium source are added to the phosphorus recovery tank 11. Meanwhile, the management personnel operate the stirring rod 25 to stir the tank, and struvite precipitates are generated in the tank. After a certain reaction time, the final discharge outlet 12 is opened, and the liquid along with the struvite is discharged downward along the discharge channel 21. At this time, the interception net 22 is located at the interception position, and the struvite is intercepted on the upstream side of the interception net 22. After the drainage is completed, the interception net 22 is pulled up, and the struvite rolls down along the discharge channel 21. At this time, the struvite can be recovered.

[0058] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A high-efficiency nitrogen and phosphorus removal device suitable for high-nitrogen and high-phosphorus wastewater, characterized in that, include: Pretreatment tank (1) is used to filter out suspended impurities in wastewater; Anoxic tank (2) is connected to the outlet of pretreatment tank (1) and is used for denitrification. The anaerobic tank (3) is connected to the outlet of the anoxic tank (2) and is used for phosphorus release; The aerobic tank (4) is connected to the outlet of the anaerobic tank (3) for nitrification and phosphorus absorption. Its outlet is connected to the anoxic tank (2) through the nitrification liquid return pipe (5). The sedimentation tank (6) is connected to the sludge outlet (7) of the aerobic tank (4) for sludge-water separation. The bottom sludge outlet (8) is connected to the anaerobic tank (3) through the sludge return pipe (9). The phosphorus recovery tank (11) is connected to the supernatant outlet (10) of the sedimentation tank (6) and is used to obtain precipitated struvite by adding a magnesium source and discharge the struvite-containing mixture through the final discharge outlet (12).

2. The high-efficiency nitrogen and phosphorus removal device for high-nitrogen and high-phosphorus wastewater according to claim 1, characterized in that, The device includes a main body (13), which contains a pretreatment tank (1), an anoxic tank (2), an anaerobic tank (3), an aerobic tank (4), a sedimentation tank (6), and a phosphorus recovery tank (11) arranged from top to bottom.

3. The high-efficiency nitrogen and phosphorus removal device for high-nitrogen and high-phosphorus wastewater according to claim 2, characterized in that, The pretreatment tank (1), anoxic tank (2), anaerobic tank (3), aerobic tank (4), sedimentation tank (6) and phosphorus recovery tank (11) are arranged in an S-shape. The pretreatment tank (1), anoxic tank (2) and aerobic tank (4) are vertically adjacent. The anoxic tank (2), aerobic tank (4) and phosphorus recovery tank (11) are vertically adjacent and staggered from the pretreatment tank (1), anoxic tank (2) and aerobic tank (4).

4. The high-efficiency nitrogen and phosphorus removal device for high-nitrogen and high-phosphorus wastewater according to claim 1, characterized in that, The pretreatment tank (1) is detachably equipped with a filter grid (14) at the top and a pretreatment sedimentation zone (15) at the bottom. The outlet of the pretreatment tank (1) is located between the pretreatment sedimentation zone (15) and the filter grid (14). The pretreatment sedimentation zone (15) is detachably provided with a flow stabilizing baffle (16) with a grid-like cross-section and extending vertically. The pretreatment tank (1) is provided with a sludge discharge port (17) at the bottom, and the bottom of the flow stabilizing baffle (16) is not connected to the bottom of the tank.

5. The high-efficiency nitrogen and phosphorus removal device for high-nitrogen and high-phosphorus wastewater according to claim 1, characterized in that, The anoxic tank (2) is equipped with denitrification packing material, the anaerobic tank (3) is equipped with phosphorus release packing material, and the aerobic tank (4) is equipped with composite packing material for nitrification and phosphorus uptake.

6. The high-efficiency nitrogen and phosphorus removal device for high-nitrogen and high-phosphorus wastewater according to claim 1, characterized in that, The bottom of the aerobic tank (4) is inclined to the side away from the sedimentation tank (6), and the sludge outlet (7) is located on the lower side; The bottom of the sedimentation tank (6) is inclined to the side away from the phosphorus recovery tank (11), the bottom sludge outlet (8) is located on the lower side of the bottom of the tank, and the supernatant outlet (10) is located on the higher side. The bottom sludge outlet (8) is also provided with a discharge port (18) for discharging excess sludge.

7. The high-efficiency nitrogen and phosphorus removal device for high-nitrogen and high-phosphorus wastewater according to claim 1, characterized in that, The bottom of the phosphorus recovery tank (11) is inclined away from the sedimentation tank (6). The sedimentation tank (6) is provided with a guano filter structure (19) connected to the final discharge port (12) below it. The sedimentation tank (6) is provided with a feeding port (20) on its side wall.

8. The high-efficiency nitrogen and phosphorus removal device for high-nitrogen and high-phosphorus wastewater according to claim 7, characterized in that, The guano filter structure (19) includes an inclined discharge channel (21) connected to the final discharge port (12). The discharge channel (21) is cut off by a trap net (22) through which guano cannot pass. The trap net (22) is detachably connected to the discharge channel (21) and can move relative to the bottom surface of the discharge channel (21).

9. The high-efficiency nitrogen and phosphorus removal device for high-nitrogen and high-phosphorus wastewater according to claim 8, characterized in that, The discharge channel (21) has a slot (23) on its side wall. The interception net (22) is inserted into the slot (23). The interception net (22) is set at an angle and its movement direction does not intersect with the bottom of the sedimentation tank (6).

10. The high-efficiency nitrogen and phosphorus removal device for high-nitrogen and high-phosphorus wastewater according to any one of claims 1-9, characterized in that, The phosphorus recovery tank (11) is provided with a feeding port (20) on the side away from the sedimentation tank (6). The phosphorus recovery tank (11) is provided with a T-shaped stirring rod (25). The hand grip end (26) of the stirring rod (25) extends out from the feeding port. The stirring section (27) at the front end of the stirring rod (25) can reciprocate along the inclined direction of the inclined bottom surface of the phosphorus recovery tank (11). The nitrification liquid return pipe (5) and the sludge return pipe (9) are respectively connected to a power pump assembly; The aerobic tank (4) is equipped with an aeration component (28) at the bottom; The nitrification liquid return pipe (5) and sludge return pipe (9) are equipped with switch valves.

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