Nitrogen and phosphorus removal device for rural domestic sewage

Abstract

The utility model belongs to the technical field of water treatment, and particularly relates to a nitrogen and phosphorus removal device for rural domestic sewage, which solves the problems of complex structure and process and high construction cost and operation cost. The nitrogen and phosphorus removal device for the rural domestic sewage comprises a pretreatment tank, and a solid matter removing structure used for filtering and collecting solid impurities is arranged in the pretreatment tank; an MBBR filler is arranged in the MBBR treatment tank, and an anti-blocking structure for preventing screen holes from being blocked by sludge and / or the MBBR filler is arranged on an output screen pipe of the MBBR treatment tank; the settling pond is used for settling sludge and outputting clear water, and a filtering structure for blocking suspended sludge is arranged on a clear water output port of the settling pond; the pretreatment tank, the MBBR treatment tank and the sedimentation tank are sequentially connected through pipelines. The effects of simple structure, low operation and maintenance cost and stable system operation are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology, and specifically relates to a device for denitrification and phosphorus removal of rural domestic sewage. Background Technology

[0002] With the continuous progress of society and the improvement of the living standards of rural residents, water consumption is increasing day by day, and sewage discharge is also increasing. Rural domestic sewage generally has excessive nitrogen and phosphorus levels. In order to protect the living environment and water environment in rural areas, it is necessary to treat rural domestic sewage for nitrogen and phosphorus removal before discharge.

[0003] Most existing technologies for nitrogen and phosphorus removal from domestic sewage are complex in structure, with high construction and operating costs, making them difficult to implement in most rural areas. Currently, some devices use the MBBR process for sewage treatment; however, when the sewage is discharged after MBBR treatment, there is no corresponding disturbance structure on the output screen, which easily leads to the accumulation of MBBR packing material and sludge clogging the screen holes, affecting the stable operation of the system. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a device for denitrification and phosphorus removal from rural domestic sewage.

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

[0006] A device for denitrifying and removing phosphorus from rural domestic sewage includes:

[0007] A pretreatment tank, which is equipped with a solids removal structure for filtering out and collecting solid impurities;

[0008] MBBR treatment tank, which contains MBBR packing material and has an anti-clogging structure on its output screen to prevent the screen holes from being blocked by sludge and / or MBBR packing material.

[0009] And a sedimentation tank, which is used to settle sludge and output clean water, wherein the clean water output port of the sedimentation tank is provided with a filter structure for blocking suspended sludge.

[0010] The pretreatment tank, MBBR treatment tank, and sedimentation tank are connected in sequence by pipelines.

[0011] The new rural domestic sewage denitrification and phosphorus removal device uses the MBBR process to purify domestic sewage by removing nitrogen and phosphorus, so that it meets the corresponding discharge standards. Specifically, the sewage to be treated enters and flows through the pretreatment tank, the MBBR treatment tank and the sedimentation tank in sequence. The pretreatment tank is primarily used to remove larger suspended solids from the wastewater to ensure the stable operation of subsequent equipment. Its solids removal structure filters out solids to achieve solid-liquid separation and effectively collects the filtered solids for timely cleaning to maintain a good and stable filtration effect. The MBBR packing material in the MBBR treatment tank grows and aggregates to form a biofilm with nitrogen and phosphorus removal functions. This biofilm specifically purifies the wastewater. The treated wastewater is then discharged to the sedimentation tank via an output screen. The anti-clogging structure prevents sludge from clogging the screen openings and from being adsorbed and aggregated by the MBBR packing material, ensuring good screen permeability. After MBBR treatment, the wastewater enters the sedimentation tank. Sludge settles at the bottom, and the supernatant is discharged from the clear water outlet. To prevent incomplete sedimentation, a filtration structure is also installed at the clear water outlet to further improve the standard of the output clear water. The wastewater purification principle of the MBBR packing material is common knowledge and will not be elaborated upon.

[0012] In the above-mentioned rural domestic sewage denitrification and phosphorus removal device, the pretreatment tank includes a square first tank body, the upper part of the first tank body is provided with a sewage inlet pipe, the lower part is provided with a first outlet pipe, and the solids removal structure is provided between the sewage inlet pipe and the first outlet pipe.

[0013] The solids removal structure includes a filter conveyor belt assembly and a waste receiving assembly, wherein the waste receiving assembly is located downstream of the filter conveyor belt assembly.

[0014] Wastewater that may contain solid debris is fed into the pretreatment tank through the wastewater inlet pipe. After passing through the filter conveyor belt assembly, the wastewater flows down while the solid debris remains on the filter conveyor belt assembly. As the filter conveyor belt assembly moves, the solid debris is conveyed to the waste receiving assembly, thus achieving the effect of filtering out and collecting the solid debris.

[0015] As an optimization, a sedimentation zone is formed at the bottom of the first pool, the first outlet pipe is located on the side wall of the sedimentation zone and is set away from the bottom of the pool, and a first switch valve is provided on the first outlet pipe.

[0016] A sedimentation zone is formed below the solids removal structure. After the wastewater is filtered, it accumulates in the sedimentation zone, where most of the tiny solid impurities that may have leaked out settle, thus improving the pretreatment effect of the wastewater.

[0017] In the aforementioned rural domestic sewage denitrification and phosphorus removal device, the filter conveyor belt assembly includes at least two rollers rotatably connected to the side wall of the first tank and a filter conveyor belt wound around the rollers. A filter surface is formed on the filter conveyor belt. A transmission drive motor is driven to at least one of the rollers to drive the filter conveyor belt to move and convey the filtered solids to the waste receiving assembly.

[0018] The filter conveyor belt is wound around the rollers, and the conveyor drive motor drives the rollers to rotate to realize the conveying motion of the filter conveyor belt. The filter surface of the filter conveyor belt is specifically used to realize solid-liquid separation and achieve the predetermined effect of filtering out solid impurities.

[0019] As an optimization, the filter conveyor belt is inclined, with the downstream roller higher than the upstream roller, and the inlet of the sewage inlet pipe is connected to the upstream or midstream of the filter surface. The filter conveyor belt includes a plurality of filter holes evenly distributed on the belt surface, and the filter surface of the filter conveyor belt has raised ribs evenly distributed along the length direction and extending along the width direction.

[0020] The filter conveyor belt is equipped with filter holes to form a filter surface. The filter surface is inclined and moves upward, that is, the filter surface moves against the direction of sewage input. With the help of the raised ribs on the filter surface, it is more conducive to carrying out solid waste mixed in with sewage, which helps to achieve a good filtration effect.

[0021] In the aforementioned rural domestic sewage denitrification and phosphorus removal device, the waste receiving component includes a receiving basket with filter holes fixed on the side wall of the first tank body. The upper opening of the receiving basket is open and connected to the lower downstream of the filter conveyor belt assembly. A waste cleaning window is provided on the side wall of the first tank body. The waste cleaning window is located above the receiving basket and is controlled to open and close by a window switch assembly.

[0022] A receiving basket is located downstream of the filter conveyor belt. When solid debris is transported to the end, it will fall into the receiving basket under the action of gravity, thus achieving the effect of collecting solid debris. Moreover, it has filter holes, and residual sewage on the solid debris can also flow down through the filter holes. In addition, the waste cleaning window opened on the side wall of the first tank can easily clean out the solid debris in the receiving basket, and the receiving basket can also be disassembled and assembled from here.

[0023] As an optimization, the window switch assembly includes a blocking plate that is locked onto the waste cleaning window, or a switch door that is rotatably connected to the outer wall of the first pool body, and a sealing ring assembly is provided between the blocking plate and the switch door and the waste cleaning window.

[0024] The window switch assembly can be implemented through a blocking plate or a switch door, etc. It is convenient to open and close, and has a simple structure. The sealing ring assembly prevents wastewater from leaking out from the edge of the waste cleaning window.

[0025] As an optimization, the first pool body is also provided with a spare screen. The spare screen is placed horizontally on the first mounting platform on the inner wall of the first pool body and is located between the waste receiving component and the first outlet pipe. The spare screen has a number of vertically opened screen filter holes evenly distributed on it.

[0026] To further ensure the effectiveness of pretreatment, a spare screen is installed in the first tank. Even if solid debris leaks out from the filter conveyor belt, the spare screen can still filter and intercept the solid debris, ensuring the smooth progress of subsequent treatment. Moreover, the spare screen is placed on the first mounting platform, which makes it detachable and convenient for loading, unloading and replacement.

[0027] In the above-mentioned rural domestic sewage denitrification and phosphorus removal device, the MBBR treatment tank includes a second tank body, the first effluent pipe of the pretreatment tank is connected to the upper part of the second tank body, the second tank body is equipped with an aeration component, and the side wall of the second tank body is equipped with an output screen pipe lower than the outlet of the first effluent pipe, and the outer end of the output screen pipe is connected to the second effluent pipe.

[0028] The aeration components installed in the second tank are used to output air into the wastewater to ensure the growth and purification of the biofilm on the MBBR packing. They also have a certain effect on promoting the suspension and movement of the MBBR packing, increasing the contact rate between the biofilm and the wastewater. The output screen is used to output the treated wastewater and intercept the MBBR packing. The treated wastewater is then transported to the subsequent sedimentation tank through the external second effluent pipe.

[0029] As an optimization, the aeration pipe of the aeration component is laid at the bottom of the second tank, and the aeration pipe is connected to the high-pressure gas generating component through the air inlet pipe.

[0030] As an optimization, an agitation component is also provided in the second tank to promote the suspension and movement of the MBBR packing. The agitation component is common knowledge and will not be elaborated on in detail.

[0031] In the aforementioned rural domestic sewage denitrification and phosphorus removal device, the anti-clogging structure includes an anti-clogging scraper ring that fits precisely on the output screen tube. The inner circumferential wall of the anti-clogging scraper ring is in close contact with the outer wall of the output screen tube. The anti-clogging scraper ring is slidably connected to a scraper ring mounting rod. The scraper ring mounting rod is fixed to the side wall of the second tank and is in the same direction as the output screen tube. A translation drive assembly for driving the anti-clogging scraper ring to reciprocate is provided between the anti-clogging scraper ring and the second tank.

[0032] The anti-clogging scraper ring is fitted onto the output screen tube and slidably connected to the scraper ring mounting rod. Driven by the translation drive assembly, it can reciprocate along the length of the output screen tube. The inner circumferential wall of the anti-clogging scraper ring contacts the outer circumferential wall of the output screen tube. While the anti-clogging scraper ring is reciprocating, its inner circumferential wall can scrape off the sludge blocking the screen holes and push away the aggregated and adsorbed MBBR packing, thereby improving the passivity of the output screen tube.

[0033] As an optimization, an elastic working part and / or a brush working part are fixed on the inner peripheral wall of the anti-clogging scraping ring, and the inner ends of the elastic working part and the brush working part are in close contact with the outer side wall of the output screen tube.

[0034] The inner circumferential wall of the anti-clogging scraper ring contacts the outer wall of the output screen tube through an elastic or brush-like part to achieve the corresponding scraping effect. Both the elastic or brush-like parts are flexible, ensuring stable contact while reducing wear on the output screen tube. The elastic part can be made of rubber.

[0035] In the aforementioned rural domestic sewage denitrification and phosphorus removal device, the translation drive assembly includes a drive screw rotatably connected to the side wall of the second tank body via a screw mounting seat. The anti-clogging scraper ring is provided with a screw nut, which meshes with the drive screw. The second tank body is provided with an anti-clogging drive motor, and the output end of the anti-clogging drive motor is connected to the drive screw.

[0036] The translation drive assembly is achieved through a drive screw and a screw nut. The anti-blocking drive motor drives the drive screw to rotate, thereby achieving the effect of the screw nut moving in translation with the anti-blocking scraping ring. The structure is simple, and the specific details of its operation are common knowledge and will not be elaborated further.

[0037] In the aforementioned rural domestic sewage denitrification and phosphorus removal device, the sedimentation tank includes a third tank body. A middle partition is vertically fixed in the middle of the third tank body, dividing the third tank body into an inlet zone and an outlet zone. A connecting gap is formed between the lower end of the middle partition and the bottom of the third tank body, connecting the inlet zone and the outlet zone. The outlet of the second outlet pipe of the MBBR treatment tank is located in the inlet zone, and the inner end of the clear water outlet is located in the outlet zone.

[0038] The middle partition divides the third tank into an inlet zone and an outlet zone. The wastewater treated by MBBR enters the inlet zone through the second outlet pipe, and then enters the outlet zone through the connecting gap. When the wastewater enters the inlet zone, it will cause water flow. The middle partition reduces the interference of this water flow on the outlet zone, ensuring a stable sedimentation effect in the outlet zone.

[0039] As an optimization, the clean water outlet is positioned lower than the outlet of the second water outlet pipe. As wastewater is discharged, the supernatant will flow out automatically.

[0040] In the aforementioned rural domestic sewage denitrification and phosphorus removal device, the filtration structure includes a mesh bag that covers the clean water outlet. The mesh bag is fixed on the annular mounting part at one end of the mesh bag fixing rod, and the other end is rotatably connected to the side wall of the third tank. The third tank is also provided with a flipping drive assembly, which is used to drive the mesh bag fixing rod to flip so that the mesh bag is located at the filtration position covering the clean water outlet or at the cleaning position above the water surface.

[0041] The mesh bag is pocket-shaped, with its upper opening fixed to the annular mounting part of the mesh bag fixing rod, keeping the upper opening open. The inner diameter of the annular mounting part is larger than the inner diameter of the clean water outlet. The bag body is located in the clean water outlet, and as clean water passes through, its extremely small filter holes further filter out suspended sludge. The flipping drive assembly is used to drive the rotation of the mesh bag fixing rod. The plane of rotation is perpendicular to the side wall of the third tank at that location. When the mesh bag fixing rod rotates to the top, the mesh bag flips out of the water surface, making it easier for staff to clean the accumulated sludge. Furthermore, when the mesh bag is in the filtration position, the mesh bag fixing rod is vertically downward, and when it is in the cleaning position, it is vertically upward, with the mesh bag extending above the upper end of the third tank for easier cleaning. The flipping drive assembly can be implemented using a motor or other common knowledge and will not be elaborated further.

[0042] In the above-mentioned rural domestic sewage denitrification and phosphorus removal device, at least one horizontally arranged and vertically spaced flow stabilizing baffle is provided in the water inlet area, and a first water passage gap is provided between the flow stabilizing baffle and the side wall of the water inlet area, with adjacent first water passage gaps being staggered.

[0043] And / or the water outlet area is provided with at least one inclined downward set sedimentation baffle and vertically spaced baffles, and a second water passage gap is provided between the sedimentation baffle and the side wall of the water outlet area, with adjacent second water passage gaps being staggered.

[0044] The third tank is also equipped with a sludge discharge outlet for an external sludge pump. The inner end of the sludge discharge outlet is close to the bottom of the third tank and is located below the sedimentation baffle.

[0045] A flow-stabilizing baffle is installed in the inlet zone to buffer the input of wastewater. A sedimentation baffle is installed in the outlet zone, ensuring that wastewater passes through various secondary water passages before exiting through the upper clear water outlet, reducing the flow rate. During this process, the sedimentation rate exceeds the flow rate, guaranteeing effective sludge settling. The sludge settles at the bottom of the tank, and is discharged through a sludge pump at the sludge discharge outlet.

[0046] As an optimization, water pump assemblies are installed on the first and second water outlet pipes to ensure the transportation of sewage.

[0047] Compared with the prior art, the present invention has the following main advantages:

[0048] 1. In this rural domestic sewage denitrification and phosphorus removal device, the pretreatment tank is mainly used to remove larger suspended solids in the wastewater to ensure the stable operation of subsequent equipment. Its solids removal structure can filter out solids to achieve solid-liquid separation, and can also effectively collect the filtered solids for timely cleaning to maintain a good and stable filtration effect. The MBBR packing in the MBBR treatment tank is used to grow and aggregate to form a biofilm with denitrification and phosphorus removal function. The biofilm specifically achieves the purification treatment of sewage. The treated sewage is discharged to the sedimentation tank through the output screen. The anti-clogging structure is used to prevent sludge from clogging the screen holes and to prevent it from being adsorbed and aggregated by the MBBR packing, ensuring good passage of the screen holes. After the MBBR treated sewage enters the sedimentation tank, the sludge settles at the bottom of the tank, and the supernatant is discharged from the clear water outlet. In order to prevent incomplete sedimentation, a filter structure is also provided at the clear water outlet to further improve the standard of the output clear water.

[0049] 2. Wastewater that may contain solid debris is fed into the pretreatment tank through the wastewater inlet pipe. After passing through the filter conveyor belt assembly, the wastewater flows down while the solid debris remains on the filter conveyor belt assembly. As the filter conveyor belt assembly moves, it is conveyed to the waste receiving assembly, thus achieving the effect of filtering out and collecting the solid debris.

[0050] 3. A receiving basket is provided downstream of the filter conveyor belt. When solid debris is conveyed to the end, it will fall into the receiving basket under the action of gravity, thus achieving the effect of collecting solid debris. Moreover, the solid debris in the receiving basket can be easily cleaned out through the waste cleaning window opened on the side wall of the first pool.

[0051] 4. The anti-clogging scraper ring is sleeved on the output screen tube and slidably connected to the scraper ring mounting rod. Driven by the translation drive assembly, it can reciprocate along the length of the output screen tube. The inner circumferential wall of the anti-clogging scraper ring contacts the outer circumferential wall of the output screen tube. While the anti-clogging scraper ring is reciprocating, its inner circumferential wall can scrape off the sludge blocking the screen holes and push away the MBBR packing that has accumulated and been adsorbed, thereby improving the passivity of the output screen tube.

[0052] 5. The mesh bag is pocket-shaped, with its upper opening fixed to the annular mounting part of the mesh bag fixing rod, keeping the upper opening open. The bag body is located in the clean water outlet. As clean water passes through, its extremely small filter holes further filter out suspended sludge. The flip-drive assembly drives the rotation of the mesh bag fixing rod. The plane of rotation is perpendicular to the side wall of the third tank at that location. When the mesh bag fixing rod rotates to the top, the mesh bag flips out of the water surface, making it easier for staff to clean the accumulated sludge. Furthermore, when the mesh bag is in the filtration position, the mesh bag fixing rod is vertically downward, and when it is in the cleaning position, it is vertically upward, with the mesh bag extending above the upper end of the third tank for easier cleaning. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the overall structure provided by this utility model;

[0054] Figure 2 This is a schematic diagram of the pretreatment tank provided by this utility model;

[0055] Figure 3 This is a schematic diagram of the MBBR treatment pool provided by this utility model;

[0056] Figure 4 This is a schematic diagram of the sedimentation tank provided by this utility model.

[0057] In the diagram, the components are: pretreatment tank 1, first tank body 11, sewage inlet pipe 12, first outlet pipe 13, sedimentation zone 14, first switch valve 15, spare screen 16, and first mounting platform 17.

[0058] MBBR treatment tank 2, second tank body 21, aeration assembly 22, output screen pipe 23, second effluent pipe 24, MBBR packing material 25.

[0059] Sedimentation tank 3, third tank body 31, intermediate partition 32, inlet area 33, outlet area 34, connecting gap 35, clear water outlet 36, flow stabilizing baffle 37, first water passage gap 38, sludge discharge outlet 39.

[0060] Solid waste removal structure 4, filter conveyor belt assembly 41, waste receiving assembly 42, roller 43, filter conveyor belt 44, filter surface 45, rib 46, receiving basket 47, waste cleaning window 48, clogging plate 49.

[0061] 5. Anti-clogging structure; 51. Anti-clogging scraper ring; 52. Scraper ring mounting rod; 53. Translation drive assembly; 54. Drive screw; 55. Screw nut.

[0062] Filter structure 6, mesh bag 61, mesh bag fixing rod 62, sedimentation baffle 63, second water passage gap 64. Detailed Implementation

[0063] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0064] Specific implementation examples Figure 1-4 As shown, this rural domestic sewage denitrification and phosphorus removal device includes:

[0065] Pretreatment tank 1, which is equipped with a solid matter removal structure 4 for filtering out and collecting solid impurities;

[0066] MBBR treatment tank 2, which is equipped with MBBR packing 25, and its output screen pipe 23 is equipped with an anti-clogging structure 5 to prevent the screen holes from being blocked by sludge and / or MBBR packing 25.

[0067] And a sedimentation tank 3, which is used to settle sludge and output clean water, and a filter structure 6 for blocking suspended sludge is provided on the clean water output port 36 of the sedimentation tank 3.

[0068] The pretreatment tank 1, MBBR treatment tank 2 and sedimentation tank 3 are connected in sequence by pipelines and the conveying force is provided by a water pump assembly.

[0069] Specifically, this rural domestic sewage denitrification and phosphorus removal device uses the MBBR process to purify domestic sewage by removing nitrogen and phosphorus, so that it meets the corresponding discharge standards. Specifically, the sewage to be treated enters and flows through the pretreatment tank 1, the MBBR treatment tank 2 and the sedimentation tank 3 in sequence. The pretreatment tank 1 is mainly used to remove larger suspended solids in the wastewater to be treated, so as to ensure the stable operation of subsequent equipment. Its solids removal structure 4 can filter out solids to achieve solid-liquid separation, and can also effectively collect the filtered solids for timely cleaning to maintain a good and stable filtration effect. The MBBR packing material 25 in the MBBR treatment tank 2 is used to grow and aggregate to form a biofilm with denitrification and phosphorus removal functions. The biofilm specifically achieves the purification treatment of wastewater. The treated wastewater is discharged to the sedimentation tank 3 through the output screen pipe 23. The anti-clogging structure 5 is used to prevent sludge from clogging the screen holes and to prevent it from being adsorbed and aggregated by the MBBR packing material 25, so as to ensure good passage of the screen holes. After the MBBR treated wastewater enters the sedimentation tank 3, the sludge settles at the bottom of the tank, and the supernatant is discharged from the clear water output port 36. In order to prevent incomplete sedimentation, a filter structure 6 is also provided on the clear water output port 36 to further improve the standard of the output clear water.

[0070] like Figure 1 , 2As shown, the pretreatment tank 1 includes a square first tank body 11. A sewage inlet pipe 12 is located at the upper part of the first tank body, and a first outlet pipe 13 is located at the lower part. A solids removal structure 4 is provided between the sewage inlet pipe 12 and the first outlet pipe 13. The solids removal structure 4 includes a filter conveyor belt assembly 41 and a waste receiving assembly 42, with the waste receiving assembly 42 connected to the lower downstream of the filter conveyor belt assembly 41. A sedimentation zone 14 is formed at the bottom of the first tank body 11. The first outlet pipe 13 is located on the side wall of the sedimentation zone 14 and is positioned away from the bottom of the tank. A first switch valve 15 is provided on the first outlet pipe 13. A spare screen 16 is also provided inside the first tank body 11. The spare screen 16 is horizontally placed on a first mounting platform 17 on the inner wall of the first tank body 11 and is located between the waste receiving assembly 42 and the first outlet pipe 13. Several vertically opened screen holes are evenly distributed on the spare screen 16.

[0071] Specifically, wastewater that may contain solid debris is fed into the pretreatment tank 1 through the wastewater inlet pipe 12. After passing through the filter conveyor belt assembly 41, the wastewater flows down while the solid debris remains on the filter conveyor belt assembly 41. As the filter conveyor belt assembly 41 moves, it is conveyed to the waste receiving assembly 42, achieving the effect of filtering out and collecting the solid debris. A sedimentation zone 14 is formed below the solids removal structure 4. After being filtered, the wastewater accumulates in the sedimentation zone 14, where most of the small solid debris that may have leaked out settles, improving the pretreatment effect of the wastewater. A spare screen 16 is installed in the first tank body 11 to further ensure the pretreatment effect. Even if solid debris leaks out from the filter conveyor belt 44, the spare screen 16 can filter and intercept the solid debris, ensuring the smooth progress of subsequent treatment. Moreover, the spare screen 16 is placed on the first mounting platform 17, which is a detachable setting, making it convenient to install, remove, and replace.

[0072] like Figure 2 As shown, the filter conveyor belt assembly 41 includes two rollers 43 rotatably connected to the side wall of the first pool body 11 and a filter conveyor belt 44 wound around the rollers 43. A filter surface 45 is formed on the filter conveyor belt 44. A drive motor is driven to one of the rollers 43 to drive the filter conveyor belt 44 to move and convey the filtered solids to the waste receiving assembly 42. The filter conveyor belt 44 is inclined, with the downstream roller 43 higher than the upstream roller 43. The outlet of the sewage inlet pipe 12 is connected to the upstream or midstream of the filter surface 45. The filter conveyor belt 44 includes a plurality of filter holes evenly distributed on the belt surface, and the filter surface 45 of the filter conveyor belt 44 has ribs 46 evenly distributed along the length direction and extending along the width direction.

[0073] Specifically, the filter conveyor belt 44 is wound around the roller 43, and the conveyor drive motor drives the roller 43 to rotate to realize the conveying motion of the filter conveyor belt 44. The filter surface 45 of the filter conveyor belt 44 is specifically used to achieve solid-liquid separation and achieve the predetermined effect of filtering out solid impurities. The filter conveyor belt 44 is provided with filter holes to form the filter surface 45. The filter surface 45 is inclined and moves upward, that is, the filter surface 45 moves against the input direction of sewage. With the assistance of the ribs 46 on the filter surface 45, it is more conducive to carrying out solid waste mixed in with sewage, which is conducive to achieving a good filtration effect.

[0074] like Figure 2 As shown, the waste receiving assembly 42 includes a receiving basket 47 with filter holes fixed to the side wall of the first pool body 11. The upper opening of the receiving basket 47 is open and it is connected to the lower downstream of the filter conveyor belt assembly 41. A waste cleaning window 48 is provided on the side wall of the first pool body 11. The waste cleaning window 48 is located above the receiving basket 47 and its opening and closing are controlled by a window switch assembly. The window switch assembly includes a blocking plate 49 that is engaged with the waste cleaning window 48, and a sealing ring assembly is provided between the blocking plate 49 and the waste cleaning window 48.

[0075] Specifically, a receiving basket 47 is located downstream of the filter conveyor belt. When solid debris is conveyed to the end, it falls into the receiving basket 47 under gravity, thus collecting the solid debris. The basket also has filter holes, allowing residual wastewater on the solid debris to flow down through the holes. Furthermore, a waste cleaning window 48 on the side wall of the first tank 11 allows for easy removal of solid debris from the receiving basket 47, and also facilitates its assembly and disassembly. The window switch assembly is implemented via a blocking plate 49, which is convenient to operate and has a simple structure. The sealing ring assembly prevents wastewater from leaking out from the edges of the waste cleaning window 48.

[0076] like Figure 1 , 3 As shown, the MBBR treatment tank 2 includes a second tank body 21. The first effluent pipe 13 of the pretreatment tank 1 is connected to the upper part of the second tank body 21. An aeration assembly 22 is installed inside the second tank body 21. An output screen pipe 23, lower than the outlet of the first effluent pipe 13, is installed on the side wall of the second tank body 21. The outer end of the output screen pipe 23 is connected to a second effluent pipe 24. The aeration pipe of the aeration assembly 22 is laid at the bottom of the second tank body 21, and the aeration pipe is connected to the high-pressure gas generating assembly through an air inlet pipe.

[0077] Specifically, the aeration component 22 installed in the second tank 21 is used to supply air into the wastewater, ensuring the growth and purification of the biofilm on the MBBR packing 25. It also promotes the suspension and movement of the MBBR packing 25, increasing the contact rate between the biofilm and the wastewater. The output screen 23 is used to discharge the treated wastewater and intercept the MBBR packing 25. The treated wastewater is then transported to the subsequent sedimentation tank 3 via the external second outlet pipe 24. Furthermore, the second tank 21 is also equipped with an agitation component to promote the suspension and movement of the MBBR packing 25, agitating the wastewater to keep the MBBR packing 25 in suspension.

[0078] like Figure 3 As shown, the anti-clogging structure 5 includes an anti-clogging scraper ring 51 that fits snugly onto the output screen tube 23. The inner circumferential wall of the anti-clogging scraper ring 51 is in close contact with the outer circumferential wall of the output screen tube 23. The anti-clogging scraper ring 51 is slidably connected to a scraper ring mounting rod 52. The scraper ring mounting rod 52 is fixed to the side wall of the second pool body 21 and is in the same direction as the output screen tube 23. A translation drive assembly 53 for driving the anti-clogging scraper ring 51 to reciprocate is provided between the anti-clogging scraper ring 51 and the second pool body 21. An elastic working part is fixed on the inner circumferential wall of the anti-clogging scraper ring 51, and the inner end of the elastic working part is in close contact with the outer circumferential wall of the output screen tube 23. The translation drive assembly 53 includes a drive screw 54 that is rotatably connected to the side wall of the second pool body 21 through a screw mounting seat. A screw nut 55 is provided on the anti-clogging scraper ring 51, and the screw nut 55 and the drive screw 54 are meshed together. An anti-clogging drive motor is provided on the second pool body 21, and the output end of the anti-clogging drive motor is connected to the drive screw 54.

[0079] Specifically, the anti-clogging scraper ring 51 is sleeved on the output screen tube 23 and slidably connected to the scraper ring mounting rod 52. Driven by the translation drive assembly 53, it can reciprocate along the length of the output screen tube 23. The inner circumferential wall of the anti-clogging scraper ring 51 contacts the outer wall of the output screen tube 23. While the anti-clogging scraper ring 51 reciprocates, its inner circumferential wall can scrape off the sludge clogging the screen holes and push away the aggregated and adsorbed MBBR packing 25, improving the throughput of the output screen tube 23. The inner circumferential wall of the anti-clogging scraper ring 51 contacts the outer wall of the output screen tube 23 through an elastic part to achieve the corresponding scraping effect. At the same time, the elastic part is flexible, ensuring stable contact while reducing wear on the output screen tube 23. The translation drive assembly 53 is implemented by a drive screw 54 and a screw nut 55. The anti-clogging drive motor drives the drive screw 54 to rotate, thereby achieving the effect of the screw nut 55 moving the anti-clogging scraper ring 51 in translation. The structure is simple.

[0080] like Figure 1 , 4As shown, the sedimentation tank 3 includes a third tank body 31. A middle partition 32 is vertically fixed in the middle of the third tank body 31, dividing the third tank body 31 into an inlet zone 33 and an outlet zone 34. A connecting gap 35 is formed between the lower end of the middle partition 32 and the bottom of the third tank body 31, connecting the inlet zone 33 and the outlet zone 34. The outlet of the second outlet pipe 24 of the MBBR treatment tank 2 is located in the inlet zone 33, and the inner end of the clear water outlet 36 is located in the outlet zone 34.

[0081] Specifically, the intermediate partition 32 divides the third tank 31 into an inlet zone 33 and an outlet zone 34. Wastewater treated by the MBBR enters the inlet zone 33 through the second outlet pipe 24, and then enters the outlet zone 34 through the connecting gap 35. The inflow of wastewater into the inlet zone 33 causes water flow disturbance. The intermediate partition 32 reduces the interference of this water flow disturbance on the outlet zone 34, ensuring a stable sedimentation effect in the outlet zone 34. The clear water outlet 36 is lower than the outlet of the second outlet pipe 24. As wastewater is discharged, the supernatant will flow out automatically.

[0082] As an optimization of this embodiment, the filter structure 6 includes a mesh bag 61 that covers the clean water outlet 36. The mesh bag 61 is fixed on the annular mounting part at one end of the mesh bag fixing rod 62, and the other end is rotatably connected to the side wall of the third pool body 31. The third pool body 31 is also provided with a flipping drive assembly, which is used to drive the mesh bag fixing rod 62 to flip so that the mesh bag 61 is located at the filter position covering the clean water outlet 36 or at the cleaning position above the water surface.

[0083] Specifically, the mesh bag 61 is pocket-shaped, with its upper opening fixed to the annular mounting part of the mesh bag fixing rod 62, keeping the upper opening open. The inner diameter of the annular mounting part is larger than the inner diameter of the clean water outlet 36. The bag body is located in the clean water outlet 36. When clean water passes through, its extremely small filter holes further filter out the suspended sludge. The flipping drive assembly is used to drive the rotation of the mesh bag fixing rod 62. The plane of rotation is perpendicular to the side wall of the third pool 31 at that location. When the mesh bag fixing rod 62 rotates to the top, the mesh bag 61 flips out of the water surface, making it easier for staff to clean the accumulated sludge. Furthermore, when the mesh bag 61 is in the filtration position, the mesh bag fixing rod 62 is vertically downward, and when it is in the cleaning position, it is vertically upward. The mesh bag 61 is higher than the upper end of the third pool 31, making cleaning even easier.

[0084] In this embodiment, two horizontally arranged and vertically spaced flow-stabilizing baffles 37 are provided in the water inlet area 33. A first water passage gap 38 is provided between the flow-stabilizing baffles 37 and the side wall of the water inlet area 33. Adjacent first water passage gaps 38 are staggered.

[0085] The water outlet zone 34 is provided with three inclined downward sedimentation baffles 63 that are vertically spaced apart. A second water passage gap 64 is provided between the sedimentation baffles 63 and the side wall of the water outlet zone 34, and adjacent second water passage gaps 64 are staggered.

[0086] The third tank 31 is also equipped with a sludge discharge outlet 39 for connecting an external sludge pump. The inner end of the sludge discharge outlet 39 is close to the bottom of the third tank 31 and is located below the sedimentation baffle 63.

[0087] Specifically, a flow-stabilizing baffle 37 is installed in the inlet zone 33 to buffer the input of wastewater. A sedimentation baffle 63 is installed in the outlet zone 34, ensuring that wastewater passes through various secondary water passages 64 before exiting through the upper clear water outlet 36, thus reducing the flow rate. During this process, the sedimentation rate is greater than the flow rate, ensuring effective sludge sedimentation. The sludge settles at the bottom of the tank, and the sludge can be discharged through the sludge discharge outlet 39 using a sludge pump.

[0088] The specific working principle is as follows: the wastewater to be treated is input from the wastewater input pipe 12. After passing through the filter surface 45, solids of a certain volume are filtered out and remain on the filter surface 45. They are then conveyed upwards by the rotation of the filter conveyor belt 44 and finally fall into the receiving basket 47 at the end of the conveyor belt. The liquid flows downwards and, after being filtered again by the spare grid 16, enters the sedimentation zone 14 below for sedimentation. The supernatant is output from the first outlet pipe 13 and enters the second tank 21.

[0089] In the second tank 21, the sewage comes into full contact with the MBBR packing material 25. The relevant bacteria on the MBBR packing material 25 remove nitrogen and phosphorus from the sewage. At the same time, the anti-clogging drive motor is activated, driving the anti-clogging scraper ring 51 to scrape back and forth on the output screen pipe 23. The treated sewage, along with a small volume of sludge, is output through the total output screen pipe 23 and enters the third tank 31.

[0090] In the third pool 31, the sewage first enters the inlet zone 33 and is buffered by the flow stabilizing baffle 37 to reduce the flow velocity. The sewage then enters the outlet zone 34 through the connecting gap 35. During this process, some sludge settles to the bottom of the pool. The sewage rises and flows in the outlet zone 34. Under the action of the sedimentation baffle 63, the flow velocity is reduced, which helps the sludge to settle further. After sedimentation, the sludge falls to the bottom of the pool through the inclined sedimentation baffle 63 and then passes through the mesh bag 61 to be discharged from the clear water outlet. The mesh bag 61 further filters out the sludge mixed in.

[0091] When a large amount of sludge accumulates in the mesh bag 61, affecting its passage, the flipping drive component rotates the mesh bag fixing rod 62 to a vertical position, causing the mesh bag 61 to leave the water surface and move to the cleaning position. Management personnel then remove the accumulated sludge. After cleaning, the flipping drive component reverses its direction, and the mesh bag 61 returns to its original position. When excessive sludge accumulates at the bottom of the pool, the sludge pump operates, and the sludge is sucked out from the sludge discharge outlet 39.

[0092] 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 device for denitrifying and removing phosphorus from rural domestic sewage, characterized in that, include: A pretreatment tank (1) is provided with a solid removal structure (4) for filtering out and collecting solid impurities. MBBR treatment tank (2), which is equipped with MBBR packing (25) and its output screen (23) is equipped with an anti-clogging structure (5) to prevent the screen holes from being blocked by sludge and / or MBBR packing (25). And a sedimentation tank (3), which is used to settle sludge and output clean water, and the clean water outlet (36) of the sedimentation tank (3) is provided with a filter structure (6) for blocking suspended sludge. The pretreatment tank (1), MBBR treatment tank (2) and sedimentation tank (3) are connected in sequence by pipelines; The MBBR treatment tank (2) includes a second tank body (21). The first effluent pipe (13) of the pretreatment tank (1) is connected to the upper part of the second tank body (21). An aeration assembly (22) is provided inside the second tank body (21). An output screen pipe (23) is provided on the side wall of the second tank body (21) below the outlet of the first effluent pipe (13). The outer end of the output screen pipe (23) is connected to a second effluent pipe (24). The anti-blocking structure (5) includes an anti-blocking scraper ring (51) that fits snugly on the output screen tube (23). The inner circumferential wall of the anti-blocking scraper ring (51) is in contact with the outer wall of the output screen tube (23). The anti-blocking scraper ring (51) is slidably connected to the scraper ring mounting rod (52). The scraper ring mounting rod (52) is fixed on the side wall of the second pool body (21) and is in the same direction as the output screen tube (23). A translation drive assembly (53) for driving the anti-blocking scraper ring (51) to move back and forth is provided between the anti-blocking scraper ring (51) and the second pool body (21).

2. The rural domestic sewage denitrification and phosphorus removal device according to claim 1, characterized in that, The pretreatment tank (1) includes a square first tank body (11), the upper part of the first tank body (11) is provided with a sewage input pipe (12), the lower part is provided with a first water outlet pipe (13), and the solid matter removal structure (4) is provided between the sewage input pipe (12) and the first water outlet pipe (13). The solids removal structure (4) includes a filter conveyor belt assembly (41) and a waste receiving assembly (42), the waste receiving assembly (42) being connected to the lower downstream of the filter conveyor belt assembly (41).

3. The rural domestic sewage denitrification and phosphorus removal device according to claim 2, characterized in that, The filter conveyor belt assembly (41) includes at least two rollers (43) rotatably connected to the side wall of the first pool body (11) and a filter conveyor belt (44) wound around the rollers (43). A filter surface (45) is formed on the filter conveyor belt (44). A transmission drive motor is drivenly connected to at least one of the rollers (43) for driving the filter conveyor belt (44) to move and convey the filtered solids to the waste receiving assembly (42).

4. The rural domestic sewage denitrification and phosphorus removal device according to claim 2, characterized in that, The waste receiving component (42) includes a receiving basket (47) with filter holes fixed on the side wall of the first pool body (11). The upper opening of the receiving basket (47) is open and connected to the lower downstream of the filter conveyor belt component (41). A waste cleaning window (48) is provided on the side wall of the first pool body (11). The waste cleaning window (48) is located above the receiving basket (47). The waste cleaning window (48) is controlled to open and close by a window switch component.

5. The rural domestic sewage denitrification and phosphorus removal device according to claim 1, characterized in that, The translation drive assembly (53) includes a drive screw (54) rotatably connected to the side wall of the second pool body (21) via a screw mounting seat. The anti-blocking scraping ring (51) is provided with a screw nut (55), which meshes with the drive screw (54). The second pool body (21) is provided with an anti-blocking drive motor, and the output end of the anti-blocking drive motor is connected to the drive screw (54) in a transmission connection.

6. The rural domestic sewage denitrification and phosphorus removal device according to any one of claims 1-5, characterized in that, The sedimentation tank (3) includes a third tank body (31). A middle partition plate (32) is vertically fixed in the middle of the third tank body (31), dividing the third tank body (31) into an inlet area (33) and an outlet area (34). A connecting gap (35) is formed between the lower end of the middle partition plate (32) and the bottom of the third tank body (31) to connect the inlet area (33) and the outlet area (34). The outlet of the second outlet pipe (24) of the MBBR treatment tank (2) is located in the inlet area (33), and the inner end of the clear water outlet (36) is located in the outlet area (34).

7. The rural domestic sewage denitrification and phosphorus removal device according to claim 6, characterized in that, The filter structure (6) includes a mesh bag (61) that is sealed on the clean water outlet (36). The mesh bag (61) is fixed on the annular mounting part at one end of the mesh bag fixing rod (62), and the other end is rotatably connected to the side wall of the third pool (31). The third pool (31) is also provided with a flipping drive assembly. The flipping drive assembly is used to drive the mesh bag fixing rod (62) to flip so that the mesh bag (61) is located at the filter position that seals the clean water outlet (36) or at the cleaning position above the water surface.

8. The rural domestic sewage denitrification and phosphorus removal device according to claim 6, characterized in that, The water inlet area (33) is provided with at least one horizontally arranged and vertically spaced flow stabilizing baffle (37), and a first water passage gap (38) is provided between the flow stabilizing baffle (37) and the side wall of the water inlet area (33), and adjacent first water passage gaps (38) are staggered. And / or the water outlet area (34) is provided with at least one inclined downward set sedimentation baffle (63) and vertically spaced apart, and a second water passage gap (64) is provided between the sedimentation baffle (63) and the side wall of the water outlet area (34), and adjacent second water passage gaps (64) are staggered; The third pool (31) is also provided with a sludge discharge outlet (39) for an external sludge pump. The inner end of the sludge discharge outlet (39) is close to the bottom of the third pool (31) and is located below the sedimentation baffle (63).

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