Rural domestic sewage bionic steady-state treatment system

Abstract

The utility model belongs to the technical field of sewage treatment, in particular relates to a bionic steady-state treatment system for rural domestic sewage, and solves the problems that the treatment cost is high and the treatment system is not green enough. The bionic steady-state treatment system for the rural domestic sewage comprises a pretreatment filtering mechanism, an oil removal mechanism and a purification mechanism which are sequentially connected through a pipeline, the purification mechanism comprises a purification tank, and an inner cavity of the purification tank is divided into a cylindrical nitrogen and phosphorus removal area and an annular purification area through a vertically-arranged tubular separation face; a nitrogen and phosphorus removal structure is arranged in the nitrogen and phosphorus removal area, a plant purification structure is arranged in the purification area, and a second water outlet pipe opening of the oil removal mechanism is connected with a water distribution pipe to convey oil-removed sewage to the bottom of the nitrogen and phosphorus removal area. According to the system, sewage treatment is carried out mainly through bionic filler and plants, and the effects of environmental protection and objective treatment cost are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and specifically relates to a biomimetic steady-state treatment system for rural domestic wastewater. Background Technology

[0002] Rural domestic sewage refers to sewage generated during production and daily life in rural areas. Sewage often contains pollutants such as nitrogen, phosphorus, organic matter, oil pollutants, and suspended solids. The unchecked discharge of this sewage will cause great harm to the rural ecological environment and greatly affect people's quality of life and production efficiency.

[0003] Various equipment and processes for treating rural domestic sewage have emerged. However, some existing rural domestic sewage treatment methods rely heavily on chemical reagents, which undoubtedly leads to problems such as high treatment costs and does not conform to the concept of green environmental protection, making them unsuitable for large-scale application in rural areas. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a biomimetic steady-state treatment system for rural domestic sewage.

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

[0006] A biomimetic steady-state treatment system for rural domestic sewage includes a pretreatment filtration mechanism, an oil removal mechanism, and a purification mechanism connected in sequence by pipelines. The purification mechanism includes a purification tank, the inner cavity of which is divided into a cylindrical denitrification and phosphorus removal zone and an annular purification zone by a vertically arranged tubular partition. The denitrification and phosphorus removal zone is equipped with a denitrification and phosphorus removal structure, and the purification zone is equipped with a plant purification structure. The second outlet of the oil removal mechanism is connected to a water distribution pipe to transport the oil-removed sewage to the bottom of the denitrification and phosphorus removal zone.

[0007] This utility model is used to treat rural domestic sewage to meet the corresponding discharge standards. The pretreatment filtration mechanism is used to pretreat the sewage by filtering and sedimentation, separating solids of a certain volume. The oil removal mechanism is used to remove oil pollutants to avoid clogging of the subsequent purification mechanism. The denitrification and phosphorus removal structure of the purification tank is used to purify the sewage by removing nitrogen and phosphorus. The plant purification structure is used to further purify the sewage. In the purification mechanism, the oil removal mechanism inputs the sewage to the bottom of the denitrification and phosphorus removal zone through the water distribution pipe. The sewage moves from bottom to top, and denitrification and phosphorus removal are achieved during the movement. The purification zone surrounds the denitrification and phosphorus removal zone. That is, after denitrification and phosphorus removal, the sewage flows out from the top opening into the purification zone. The sewage flow is smooth and the denitrification and phosphorus removal zone and the purification zone are compactly arranged, which helps to improve space utilization.

[0008] In the aforementioned biomimetic steady-state treatment system for rural domestic sewage, a circular perforated baffle is horizontally fixed in the nitrogen and phosphorus removal zone. Above the perforated baffle, a nitrogen and phosphorus interception channel is formed by a material-carrying spiral, and below it, a water distribution zone is formed. The nitrogen and phosphorus interception channel is filled with biomimetic filler for nitrogen and phosphorus removal. The vertical section of the water distribution pipe passes through the center of the nitrogen and phosphorus interception channel and the perforated baffle from top to bottom, and is connected to the water distribution zone.

[0009] The denitrification and phosphorus removal zone is cylindrical. The inner cavity is divided into two parts by a circular perforated baffle at the bottom. The lower part is the water distribution zone, and the upper part is equipped with a material-carrying spiral. A spiral nitrogen and phosphorus interception channel is formed between the material-carrying spiral and the side wall. This channel is filled with biomimetic packing material. Wastewater first enters the lower water distribution zone and then moves upward, contacting the biomimetic packing material in the nitrogen and phosphorus interception channel. Because the channel is spiral, the movement distance of the wastewater is greatly increased, improving the retention rate of nitrogen and phosphorus pollutants by the biomimetic packing material.

[0010] As an optimization, the outer diameter of the perforated baffle and the outer diameter of the nitrogen and phosphorus interception channel are adapted to the inner diameter of the nitrogen and phosphorus removal zone.

[0011] The perforated baffle has holes through which water can pass but not through which the biomimetic packing material can pass. These holes support the biomimetic packing material. The outer diameter of the perforated baffle and the nitrogen and phosphorus interception channel is adapted to the inner diameter of the nitrogen and phosphorus removal zone, meaning they fit snugly against the inner sidewall of the zone. This reduces the possibility of wastewater moving directly upwards along the sidewall and avoiding the biomimetic packing material, ensuring effective nitrogen and phosphorus removal. The biomimetic packing material is common knowledge, and its selection and operating principles will not be elaborated upon.

[0012] In the aforementioned biomimetic steady-state treatment system for rural domestic sewage, the plant purification structure includes submerged plants planted at the bottom of the purification zone through the bottom sediment, and annular ecological floating islands floating on the water surface. The ecological floating islands are fitted over the tubular partition surface and are planted with emergent plants. Vertically penetrating light-transmitting holes are evenly distributed on the ecological floating islands. Aeration components are also provided in the purification zone.

[0013] The ecological floating island is ring-shaped and located precisely in the ring-shaped purification zone outside the nitrogen and phosphorus removal zone. Emergent plants on it and submerged plants at the bottom of the pool further purify the wastewater. Light-permeable holes allow sunlight to pass through, meeting the light requirements for photosynthesis in the submerged plants. Aeration components increase the oxygen concentration in the water, meeting the respiration needs of the submerged plants. Furthermore, the outer diameter of the ecological floating island is adapted to the inner diameter of the purification pool, and the inner diameter is adapted to the outer diameter of the tubular partition surface, maximizing the installation area of ​​the ecological floating island within a limited space.

[0014] In the aforementioned biomimetic steady-state treatment system for rural domestic sewage, the aeration component includes an annular aeration pipe with uniformly distributed micro-aeration holes. The annular aeration pipe is sleeved on the tubular partition surface and limited by an L-shaped positioning buckle. The L-shaped positioning buckle is evenly distributed circumferentially on the outer wall of the tubular partition surface. The annular aeration pipe is connected to the aeration device through an air inlet pipe.

[0015] The aeration assembly introduces air through an annular aeration pipe connected to the aeration device. The annular aeration pipe surrounds the tubular partition surface, ensuring uniform aeration at least in the circumferential direction. Moreover, it can be detached and fixed by an L-shaped positioning buckle, making it easy to assemble and disassemble.

[0016] In the above-mentioned biomimetic steady-state treatment system for rural domestic sewage, the bottom surface of the water distribution area includes a guide funnel surface, and a second sewage outlet is provided at the lowest point of the guide funnel surface.

[0017] The lower end of the tubular partition is integrally connected to the bottom of the purification tank, and the upper edge is lower than the upper edge of the purification tank.

[0018] The purification tank has a final discharge port on its side wall, and the final discharge port is lower than the upper edge of the tubular partition surface.

[0019] The bottom of the water distribution area features a funnel-shaped guide funnel surface. Small suspended solids in the wastewater settle and accumulate from the lowest point upwards and outwards. A second discharge pipe is located at this lowest point, allowing for rapid and maximal discharge of the sediment. The lower end of the tubular partition is fixed to the bottom of the tank, radially dividing the inner cavity. The upper edge is lower than the purification tank, reducing the shading area on emergent plants. The final discharge pipe is positioned at the upper edge of the tubular partition, ensuring the liquid level in the purification zone is no higher than that in the denitrification and phosphorus removal zone, allowing wastewater to overflow smoothly from the upper edge of the denitrification and phosphorus removal zone. The tubular partition can be constructed using brickwork or steel baffles.

[0020] In the aforementioned biomimetic steady-state treatment system for rural domestic sewage, the pretreatment filtration mechanism includes a square pretreatment tank. The upper part of the side wall of the pretreatment tank is provided with a first inlet pipe, and the middle part is provided with a first outlet pipe. A filter screen for intercepting solid debris is provided between the first inlet pipe and the first outlet pipe. A waste discharge structure is provided between the filter screen and the inner side wall of the pretreatment tank.

[0021] The pretreatment tank filters out solid waste of a certain volume through a filter screen. The first inlet and the first outlet are located in the upper middle part, and a sedimentation zone is formed between the first outlet and the bottom of the tank for further sedimentation of sewage, thereby improving the removal rate of solids. The waste discharge structure is used to quickly discharge the solids on the filter screen, which is convenient for daily operation and maintenance.

[0022] In the aforementioned biomimetic steady-state treatment system for rural domestic sewage, the waste discharge structure includes a waste discharge port located on the side wall of the pretreatment tank. The waste discharge port is located below the filter screen and has a hinged door on its lower side. The filter screen is hinged to the side wall of the pretreatment tank via a horizontally arranged connecting shaft. A switch linkage structure is provided between the lower end of the filter screen and the opening / closing door. The upper end rests on a limiting protrusion on the inner side wall of the pretreatment tank. The connecting shaft is eccentrically positioned and close to the lower end.

[0023] The filter screen features a hinged design, allowing it to rotate vertically. In its normal filtration state, one end rests on a limiting boss. Because the connecting shaft is positioned away from the rising end (and thus away from the limiting boss), the filter screen naturally maintains a horizontal position. Operators can control the rotation of the filter screen by pulling up the rising end. Simultaneously, the switch-linked mechanism opens the door, ensuring that the filtered solids roll down the inclined screen surface and are discharged from the waste outlet, facilitating waste removal. The pretreatment tank sidewall where the waste outlet is located is parallel to the connecting shaft.

[0024] In the above-mentioned biomimetic steady-state treatment system for rural domestic sewage, the switch linkage structure includes a connecting cable with two ends connected to the upper end of the switch door and the lower end of the filter screen, respectively. The hinge shaft of the switch door is provided with a spring assembly, which makes the switch door have the tendency to rotate inward to open the waste discharge port.

[0025] When the filter screen is in a horizontal state, the switch door is pulled up to a vertical state to close the waste outlet; when rotated to an inclined state, the switch door is allowed to rotate inward to open the waste outlet, and an inclined ramp is formed between the filter screen and the switch door to connect with the waste outlet.

[0026] The switch door is also hinged to the side wall of the pool and has a tendency to rotate inward to open the waste discharge port via a spring assembly. The lower end of the filter screen is connected to the upper end of the switch door via a connecting cable. When the filter screen is horizontal, the connecting cable pulls the switch door to a vertical position to close the waste discharge port. When the filter screen rotates, the lower end moves downward, and at the same time, the switch door also rotates inward under the action of the spring assembly, realizing the linkage of opening the waste discharge port. In this way, an inclined ramp connected to the waste discharge port is formed between the filter screen and the switch door, which is used to fix the filtered material for easy discharge.

[0027] As an improvement, the upper side of the rising end is provided with a hook for pulling up the rising end. This makes it easier for the operator to pull up the rising end.

[0028] As a further optimization, the upper end of the waste discharge port is provided with a limiting slope that is higher on the inside and lower on the outside, and the upper end of the switch door is provided with a matching slope. When the switch door is closed vertically, the limiting slope and the matching slope are exactly in contact and limited. The contact between the limiting slope and the matching slope improves the sealing performance and also has a corresponding limiting effect.

[0029] In the above-mentioned biomimetic steady-state treatment system for rural domestic sewage, a first sedimentation zone is formed between the first outlet and the bottom of the pretreatment tank. The bottom of the first sedimentation zone includes a guide slope. A first sewage outlet is provided on the lower part of the side wall of the pretreatment tank, and the first sewage outlet is located on the lower side of the guide slope.

[0030] The first sedimentation zone is used to settle small-diameter solids in wastewater, improving the filtration effect of suspended solids. The bottom of the first sedimentation zone is a guide slope, and the suspended solids tend to move towards the lower side after settling. The first sewage outlet is located on this lower side, which is conducive to the discharge of sediments.

[0031] In the aforementioned biomimetic steady-state treatment system for rural domestic sewage, the oil removal mechanism includes an oil-water separator assembly. The second inlet of the oil-water separator assembly and the first outlet of the pretreatment filtration mechanism are connected by a pipeline, and the second outlet is connected to the water distribution pipe.

[0032] The oil removal mechanism is achieved through an oil-water separator assembly, which can effectively remove oil pollutants from wastewater and prevent clogging of subsequent purification mechanisms. The oil-water separator assembly is existing technology and will not be elaborated on in detail.

[0033] As an optimization, the first water inlet, first water outlet, second water inlet, second water outlet, first sewage outlet, second sewage outlet, water distribution pipe, and final discharge outlet are equipped with switch valves. These valves allow for the control of the opening and closing of the corresponding pipes, facilitating maintenance of each unit.

[0034] Compared with the prior art, the present invention has the following main advantages:

[0035] 1. The pretreatment filtration unit is used for pretreatment of wastewater, such as filtration and sedimentation, to separate solids of a certain volume. The oil removal unit is used to remove oil pollutants to prevent them from clogging subsequent purification units. The denitrification and phosphorus removal structure of the purification tank is used for denitrification and phosphorus removal purification of wastewater. The plant purification structure is used for further purification of wastewater. In the purification unit, the oil removal unit feeds wastewater into the bottom of the denitrification and phosphorus removal zone through a water distribution pipe. The wastewater moves from bottom to top, achieving denitrification and phosphorus removal during the movement. The purification zone surrounds the denitrification and phosphorus removal zone, meaning that after denitrification and phosphorus removal, the wastewater flows out from the top opening into the purification zone. The wastewater flow is smooth, and the denitrification and phosphorus removal zone and the purification zone are compactly arranged, which helps to improve space utilization.

[0036] 2. The nitrogen and phosphorus removal zone is cylindrical. The inner cavity is divided into two parts by a circular perforated baffle at the bottom. The lower part is the water distribution zone, and the upper part is equipped with a material-carrying spiral. A spiral nitrogen and phosphorus interception channel is formed between the material-carrying spiral and the side wall. This channel is filled with biomimetic packing material. Wastewater first enters the lower water distribution zone and then moves upward, contacting the biomimetic packing material in the nitrogen and phosphorus interception channel. Because the channel is spiral, the movement distance of the wastewater is greatly increased, improving the retention rate of nitrogen and phosphorus pollutants by the biomimetic packing material.

[0037] 3. The bottom of the water distribution area is equipped with a funnel-shaped guide funnel surface. Small-volume suspended solids in the sewage will settle and accumulate from the lowest position upwards and outwards. The second sewage outlet is set at the lowest position, through which the sediment can be discharged quickly and to the maximum extent.

[0038] 4. The filter screen features a hinged design, allowing it to be flipped vertically. In normal filtration mode, one end rests on a limiting boss. Because the connecting shaft is located away from the rising end, i.e., away from the limiting boss, the filter screen naturally remains horizontal. Operators can control the rotation of the filter screen by pulling up the rising end. Simultaneously with this rotation, the switch linkage mechanism opens the door, ensuring that the filtered solids can roll down the inclined screen surface and be discharged from the waste outlet, facilitating waste removal. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure provided by this utility model;

[0040] Figure 2 This is a schematic diagram of the pretreatment filtration mechanism provided by this utility model when discharging material at the waste outlet;

[0041] Figure 3 This is a schematic diagram of the purification mechanism provided by this utility model;

[0042] Figure 4This is a top view schematic diagram of the ecological floating bed provided by this utility model.

[0043] In the diagram, the components are: pretreatment filtration mechanism 1, pretreatment tank 11, first inlet pipe 12, first outlet pipe 13, filter screen 14, waste discharge structure 15, waste discharge port 16, switch door 17, switch linkage structure 18, limiting boss 19, connecting shaft 20, connecting cable 21, hook body 22, limiting inclined surface 23, mating inclined surface 24, first sedimentation zone 25, guide inclined surface 26, first sewage outlet 27, purification mechanism 3, purification tank 31, tubular partition surface 32, denitrification and phosphorus removal zone 33, purification zone 34, denitrification and phosphorus removal zone. 35. Phosphorus structure, 36. Plant purification structure, 37. Water distribution pipe, 38. Perforated baffle, 39. Material-carrying spiral, 40. Water distribution area, 41. Bionic filler, 42. Submerged plant, 43. Ecological floating island, 44. Emergent plant, 45. Aeration component, 46. Ring aeration pipe, 47. L-shaped positioning buckle, 48. Guide funnel surface, 49. Second sewage outlet, 50. Final discharge outlet, 51. Nitrogen and phosphorus interception channel, 52. Air inlet pipe, 53. Light transmission hole, 6. Oil removal mechanism, 61. Second water outlet, 62. Second water inlet, 63. Oil-water separator component. Detailed Implementation

[0044] 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.

[0045] Specific implementation examples Figure 1-4 As shown, this rural domestic sewage biomimetic steady-state treatment system includes a pretreatment filtration unit 1, an oil removal unit 6, and a purification unit 3 connected in sequence by pipelines. The purification unit 3 includes a purification tank 31. The inner cavity of the purification tank 31 is divided into a cylindrical denitrification and phosphorus removal zone 33 and an annular purification zone 34 by a vertically arranged tubular partition surface 32. The denitrification and phosphorus removal zone 33 is equipped with a denitrification and phosphorus removal structure 35, and the purification zone 34 is equipped with a plant purification structure 36. The second outlet 61 of the oil removal unit 6 is connected to a water distribution pipe 37 to transport the oil-removed sewage to the bottom of the denitrification and phosphorus removal zone 33.

[0046] Specifically, this utility model is used to treat rural domestic sewage to meet the corresponding discharge standards. The pretreatment filtration mechanism 1 is used to pretreat the sewage by filtering and sedimentation, separating solids of a certain volume. The oil removal mechanism 6 is used to remove oil pollutants to avoid the oil pollutants from causing blockage or other effects on the subsequent purification mechanism 3. The denitrification and phosphorus removal structure 35 of the purification tank 31 is used to purify the sewage by removing nitrogen and phosphorus. The plant purification structure 36 is used to further purify the sewage. In the purification mechanism 3, the oil removal mechanism 6 inputs the sewage into the bottom of the denitrification and phosphorus removal zone 33 through the water distribution pipe 37. The sewage moves from bottom to top, and the denitrification and phosphorus removal of the sewage is achieved during the movement. The purification zone 34 surrounds the outside of the denitrification and phosphorus removal zone 33. That is, after denitrification and phosphorus removal, the sewage flows out from the top opening into the purification zone 34. The sewage flow is smooth. The denitrification and phosphorus removal zone 33 and the purification zone 34 are compactly arranged, which is conducive to improving space utilization.

[0047] like Figure 1 , 3 As shown, a circular perforated baffle 38 is horizontally fixed within the denitrification and phosphorus removal zone 33. Above the perforated baffle 38, a spirally ascending nitrogen and phosphorus interception channel 51 is formed by a material-carrying screw 39. Below, a water distribution zone 40 is formed. The nitrogen and phosphorus interception channel 51 is filled with biomimetic packing material 41 for denitrification and phosphorus removal. The vertical section of the water distribution pipe 37 passes through the center of the nitrogen and phosphorus interception channel 51 and the perforated baffle 38 from top to bottom, and is connected to the water distribution zone 40. The outer diameter of the perforated baffle 38 and the outer diameter of the nitrogen and phosphorus interception channel 51 are adapted to the inner diameter of the denitrification and phosphorus removal zone 33.

[0048] Specifically, the denitrification and phosphorus removal zone 33 is cylindrical. The inner cavity is divided into two parts by a circular perforated baffle 38 at the bottom. The lower part is the water distribution zone 40, and the upper part is equipped with a material-carrying spiral 39. A spiral nitrogen and phosphorus interception channel 51 is formed between the material-carrying spiral 39 and the side wall. The channel is filled with biomimetic filler 41. The sewage first enters the lower water distribution zone 40 and then moves upward. It comes into contact with the biomimetic filler 41 in the nitrogen and phosphorus interception channel 51. Since the channel is spiral, the movement distance of the sewage is greatly increased, which improves the retention rate of nitrogen and phosphorus pollutants by the biomimetic filler 41. The perforated baffle 38 has holes through which water can pass but not through which the biomimetic packing 41 can pass, in order to support the biomimetic packing 41. The outer diameter of the perforated baffle 38 and the nitrogen and phosphorus interception channel 51 are adapted to the inner diameter of the denitrification and phosphorus removal zone 33, that is, they are in close contact with the inner sidewall of the denitrification and phosphorus removal zone 33, which reduces the possibility of sewage moving directly upward along the sidewall and avoiding the biomimetic packing 41, thus ensuring the denitrification and phosphorus removal effect.

[0049] like Figure 3 , 4As shown, the plant purification structure 36 includes submerged plants 42 planted in the bottom sediment of the purification zone 34, and an annular ecological floating island 43 floating on the water surface. The ecological floating island 43 is fitted onto the tubular partition surface 32 and is planted with emergent plants 44. Vertically penetrating light-transmitting holes 53 are evenly distributed on the ecological floating island 43. An aeration component 45 is also provided in the purification zone 34. The aeration component 45 includes an annular aeration pipe 46 with evenly distributed micro-aeration holes. The annular aeration pipe 46 is fitted onto the tubular partition surface 32 and limited by L-shaped positioning buckles 47. The L-shaped positioning buckles 47 are evenly distributed circumferentially on the outer wall of the tubular partition surface 32. The annular aeration pipe 46 is connected to the aeration device through an air inlet pipe 52. The bottom surface of the water distribution area 40 includes a guide funnel surface 48, and a second sewage outlet 49 is provided at the lowest point of the guide funnel surface 48; the lower end of the tubular partition surface is integrally connected to the bottom of the purification tank 31, and the upper edge is lower than the upper edge of the purification tank 31; a final discharge outlet 50 is provided on the side wall of the purification tank 31, and the final discharge outlet 50 is lower than the upper edge of the tubular partition surface.

[0050] Specifically, the ecological floating island 43 is ring-shaped and located precisely in the ring-shaped purification zone 34 outside the nitrogen and phosphorus removal zone 33. Emergent plants 44 on it and submerged plants 42 at the bottom of the pool further purify the wastewater. Light-transmitting holes 53 allow sunlight to pass through, meeting the light requirements for photosynthesis in the submerged plants 42. Aeration components 45 increase the oxygen concentration in the water, meeting the respiration requirements of the submerged plants 42. The outer diameter of the ecological floating island 43 is adapted to the inner diameter of the purification pool 31, and its inner diameter is adapted to the outer diameter of the tubular partition surface 32, maximizing the installation area of ​​the ecological floating island 43 within a limited space. The aeration components 45 aerate the water through a ring-shaped aeration pipe 46 connected to the aeration device. The ring-shaped aeration pipe 46 surrounds the tubular partition surface 32, ensuring uniform aeration at least in the circumferential direction. Furthermore, it is detachably fixed by L-shaped positioning buckles 47, making assembly and disassembly convenient. The bottom of the water distribution zone 40 is equipped with a funnel-shaped guide funnel surface 48. Small suspended solids in the wastewater will settle and accumulate from the lowest position upwards and outwards. A second sewage outlet 49 is located at this lowest position, through which the sediment can be discharged quickly and to the maximum extent. The lower end of the tubular partition surface is fixed to the bottom of the pool, dividing the inner cavity in the radial direction. The upper edge is lower than that of the purification pool 31, which helps to reduce the shading area of ​​the tubular partition surface on the emergent plants 44. The final discharge outlet 50 abuts against the upper edge of the tubular partition surface 32, that is, the liquid level in the purification zone 34 is not higher than that in the denitrification and phosphorus removal zone 33, ensuring that the wastewater can smoothly overflow from the upper edge of the denitrification and phosphorus removal zone 33. The tubular partition surface 32 can be implemented by brickwork or by installing steel baffles.

[0051] like Figure 1 , 2As shown, the pretreatment filtration mechanism includes a square pretreatment tank 11. A first inlet pipe 12 is located on the upper part of the side wall of the pretreatment tank 11, and a first outlet pipe 13 is located in the middle. A filter screen 14 for intercepting solid debris is provided between the first inlet pipe 12 and the first outlet pipe 13. A waste discharge structure 15 is provided between the filter screen 14 and the inner side wall of the pretreatment tank 11. The waste discharge structure 15 includes a waste outlet 16 opened on the side wall of the pretreatment tank 11. The waste outlet 16 is located below the filter screen 14, and a switch door 17 is hinged to its lower side. The filter screen 14 is hinged to the side wall of the pretreatment tank 11 via a horizontally arranged connecting shaft 20. A switch linkage structure 18 is provided between the descending end of the filter screen 14 and the switch door 17. The ascending end rests on a limiting boss 19 on the inner side wall of the pretreatment tank 11. The connecting shaft 20 is eccentrically positioned and close to the descending end.

[0052] Specifically, the pretreatment tank 11 filters out solid waste of a certain volume through the filter screen 14. The first inlet 12 and the first outlet 13 are located in the upper middle part, forming a sedimentation zone between the first outlet 13 and the bottom of the tank for further sedimentation of the wastewater, thereby improving the removal rate of solids. The waste discharge structure 15 is used to quickly discharge the solids on the filter screen 14, facilitating daily operation and maintenance. The filter screen 14 has a hinged design and can be flipped along the vertical plane. In the normal filtration state, one end is mounted on the limiting boss 19. Since the connecting shaft 20 is far away from the rising end, i.e., far away from the limiting boss 19, the filter screen 14 can be kept in a horizontal state naturally. The operator can control the rotation of the filter screen 14 by pulling up the rising end. At the same time as this rotation, the switch linkage structure 18 opens the door 17 simultaneously, ensuring that the fixed objects filtered on the filter screen 14 can roll down along the inclined mesh surface and be discharged from the waste discharge port 16, making waste discharge convenient. Of course, the side wall of the pretreatment tank 11 where the waste discharge port 16 is located is parallel to the connecting shaft 20.

[0053] In this embodiment, the switch linkage structure 18 includes connecting cables 21 connected at both ends to the upper end of the switch door 17 and the lower end of the filter screen 14, respectively. A spring assembly is provided on the hinge shaft of the switch door 17, so that the switch door 17 has a tendency to rotate inward to open the waste discharge port 16. When the filter screen 14 is in a horizontal state, it just pulls the switch door 17 to a vertical state to close the waste discharge port 16. When rotated to an inclined state, the switch door 17 is allowed to rotate inward to open the waste discharge port 16. An inclined ramp is formed between the filter screen 14 and the switch door 17 to connect with the waste discharge port 16.

[0054] The switch door 17 is also hinged to the side wall of the pool and has a tendency to rotate inward to open the waste discharge port 16 via a spring assembly. The descending end of the filter screen 14 is connected to the upper end of the switch door 17 via a connecting cable 21. When the filter screen 14 is horizontal, the connecting cable 21 pulls the switch door 17 to a vertical position to close the waste discharge port 16. When the filter screen 14 rotates, the descending end moves downward, and at the same time, the switch door 17 also rotates inward under the action of the spring assembly, realizing the linkage of opening the waste discharge port 16. In this way, an inclined ramp connected to the waste discharge port 16 is formed between the filter screen 14 and the switch door 17, which is used to fix the filtered material for easy discharge. As an optimization, a hook 22 is provided on the upper side of the rising end for pulling up the rising end. This makes it easier for the operator to pull up the rising end. Furthermore, the upper end of the waste discharge port 16 is provided with a limiting inclined surface 23 that is higher on the inside and lower on the outside, and the upper end of the opening and closing door 17 is provided with a matching inclined surface 24. When the opening and closing door 17 is closed vertically, the limiting inclined surface 23 and the matching inclined surface 24 are exactly in contact and limited. The contact between the limiting inclined surface 23 and the matching inclined surface 24 improves the sealing performance on the one hand, and also has a corresponding limiting effect on the other hand.

[0055] As an optimization of this embodiment, a first sedimentation zone 25 is formed between the first outlet 13 and the bottom of the pretreatment tank 11. The bottom of the first sedimentation zone 25 includes a guide slope 26. A first sewage outlet 27 is provided at the lower part of the side wall of the pretreatment tank 11, and the first sewage outlet 27 is located on the lower side of the guide slope 26.

[0056] Specifically, the first sedimentation zone 25 is used to settle small-diameter solids in wastewater and improve the filtration effect of suspended solids. The bottom of the first sedimentation zone 25 is a guide slope 26. After the suspended solids settle, they tend to move towards the lower side. The first sewage outlet 27 is located on this lower side, which is conducive to the discharge of the sediments.

[0057] In this embodiment, the oil removal mechanism 6 includes an oil-water separator assembly 63. The second water inlet 62 of the oil-water separator assembly 63 and the first water outlet 13 of the pretreatment filter mechanism 1 are connected by a pipeline. The second water outlet 61 is connected to the water distribution pipe 37.

[0058] Specifically, the oil removal mechanism 6 is implemented through the oil-water separator assembly 63, which can effectively remove oil pollutants from wastewater and prevent clogging of the subsequent purification mechanism 3.

[0059] Furthermore, the first inlet pipe 12, the first outlet pipe 13, the second inlet pipe 62, the second outlet pipe 61, the first drain pipe 27, the second drain pipe 49, the water distribution pipe 37, and the final discharge pipe 50 are equipped with switch valves. The corresponding switch valves can be used to control the opening and closing of the corresponding pipes, facilitating the maintenance of each unit.

[0060] The specific working principle is as follows: Wastewater first enters the pretreatment tank 11, where the filter screen 14 filters out solids of a certain volume in the water. The wastewater then enters the first sedimentation zone 25 below, and the supernatant flows out from the first outlet 13 and enters the oil-water separator assembly 63. After removing oil pollutants, the wastewater is fed into the distribution zone 40 through the distribution pipe 37 from the second outlet 61. As the wastewater continues to flow in, it moves upward and passes through the spiral nitrogen and phosphorus interception channel 51, where it is intercepted by the biomimetic filler 41. After nitrogen and phosphorus removal, the wastewater overflows from the upper opening into the purification zone 34. The emergent plants 44 and submerged plants 42 in the purification zone 34 further purify the wastewater through photosynthesis. Finally, the treated wastewater is discharged from the final discharge pipe 50.

[0061] 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 substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A biomimetic steady-state treatment system for rural domestic sewage, characterized in that, The system includes a pretreatment filtration mechanism (1), an oil removal mechanism (6), and a purification mechanism (3) connected in sequence by pipelines. The purification mechanism (3) includes a purification tank (31). The inner cavity of the purification tank (31) is divided into a cylindrical denitrification and phosphorus removal zone (33) and an annular purification zone (34) by a vertically arranged tubular partition (32). The denitrification and phosphorus removal zone (33) is equipped with a denitrification and phosphorus removal structure (35), and the purification zone (34) is equipped with a plant purification structure (36). The second outlet (61) of the oil removal mechanism (6) is connected to a water distribution pipe (37) to transport the oil-removed wastewater to the bottom of the denitrification and phosphorus removal zone (33).

2. The biomimetic steady-state treatment system for rural domestic sewage according to claim 1, characterized in that, A circular perforated baffle (38) is horizontally fixed in the denitrification and phosphorus removal zone (33). Above the perforated baffle (38), a nitrogen and phosphorus interception channel (51) is formed by a material-carrying screw (39) in a spiral upward manner. Below the perforated baffle (38), a water distribution zone (40) is formed. The nitrogen and phosphorus interception channel (51) is filled with biomimetic filler (41) for denitrification and phosphorus removal. The vertical section of the water distribution pipe (37) passes through the center of the nitrogen and phosphorus interception channel (51) and the perforated baffle (38) from top to bottom, and is connected to the water distribution zone (40).

3. The biomimetic steady-state treatment system for rural domestic sewage according to claim 2, characterized in that, The plant purification structure (36) includes submerged plants (42) planted in the bottom of the purification zone (34) through the bottom mud, and an annular ecological floating island (43) floating on the water surface. The ecological floating island (43) is fitted outside the tubular partition surface (32) and is planted with emergent plants (44). The ecological floating island (43) is evenly provided with vertically penetrating light-transmitting holes (53). The purification zone (34) is also provided with an aeration component (45).

4. The biomimetic steady-state treatment system for rural domestic sewage according to claim 3, characterized in that, The aeration assembly (45) includes an annular aeration pipe (46) with uniformly distributed micro-aeration holes. The annular aeration pipe (46) is sleeved on the tubular partition surface (32) and limited by an L-shaped positioning buckle (47). The L-shaped positioning buckle (47) is evenly distributed on the outer wall of the tubular partition surface (32) in a circumferential direction. The annular aeration pipe (46) is connected to the aeration device through an air inlet pipe (52).

5. The biomimetic steady-state treatment system for rural domestic sewage according to claim 3, characterized in that, The bottom surface of the water distribution area (40) includes a guide funnel surface (48), and a second sewage outlet (49) is provided at the lowest point of the guide funnel surface (48). The lower end of the tubular partition surface (32) is integrally connected to the bottom of the purification tank (31), and the upper edge is lower than the upper edge of the purification tank (31). The purification tank (31) has a final discharge port (50) on its side wall, and the final discharge port (50) is lower than the upper edge of the tubular partition surface.

6. The biomimetic steady-state treatment system for rural domestic sewage according to any one of claims 1-5, characterized in that, The pretreatment filtration mechanism (1) includes a square pretreatment tank (11). The upper part of the side wall of the pretreatment tank (11) is provided with a first water inlet (12) and the middle part is provided with a first water outlet (13). A filter screen (14) for intercepting solid debris is provided between the first water inlet (12) and the first water outlet (13). A waste discharge structure (15) is provided between the filter screen (14) and the inner side wall of the pretreatment tank (11).

7. The biomimetic steady-state treatment system for rural domestic sewage according to claim 6, characterized in that, The waste discharge structure (15) includes a waste discharge port (16) opened on the side wall of the pretreatment tank (11). The waste discharge port (16) is located below the filter screen (14) and a switch door (17) is hinged to the lower side. The filter screen (14) is hinged to the side wall of the pretreatment tank (11) through a horizontally set connecting shaft (20). A switch linkage structure (18) is provided between the lower end of the filter screen (14) and the switch door (17). The upper end rests on the limiting boss (19) on the inner side wall of the pretreatment tank (11). The connecting shaft (20) is eccentrically set and close to the lower end.

8. The biomimetic steady-state treatment system for rural domestic sewage according to claim 7, characterized in that, The switch linkage structure (18) includes a connecting cable (21) with its two ends connected to the upper end of the switch door (17) and the lower end of the filter screen (14), respectively. The hinge shaft of the switch door (17) is provided with a spring assembly, which makes the switch door (17) have the tendency to rotate inward to open the waste discharge port (16). When the filter screen (14) is in a horizontal state, the switch door (17) is pulled up to a vertical state to close the waste outlet (16); when rotated to an inclined state, the switch door (17) is allowed to rotate inward to open the waste outlet (16), and an inclined ramp is formed between the filter screen (14) and the switch door (17) to connect with the waste outlet (16).

9. The biomimetic steady-state treatment system for rural domestic sewage according to claim 6, characterized in that, A first sedimentation zone (25) is formed between the first outlet (13) and the bottom of the pretreatment tank (11). The bottom of the first sedimentation zone (25) includes a guide slope (26). A first sewage outlet (27) is provided on the lower part of the side wall of the pretreatment tank (11), and the first sewage outlet (27) is located on the lower side of the guide slope (26).

10. The biomimetic steady-state treatment system for rural domestic sewage according to any one of claims 1-5, characterized in that, The oil removal mechanism (6) includes an oil-water separator assembly (63), the second water inlet (62) of the oil-water separator assembly (63) and the first water outlet (13) of the pretreatment filter mechanism (1) are connected by a pipeline, and the second water outlet (61) is connected to the water distribution pipe (37).

Images