Nitrogen and phosphorus removal treatment system suitable for rural operational wastewater

Abstract

The utility model belongs to the technical field of wastewater treatment, particularly relates to a nitrogen and phosphorus removal treatment system suitable for rural operational wastewater, and solves the problem of low wastewater treatment efficiency. The nitrogen and phosphorus removal treatment system suitable for rural operational wastewater comprises a filtering and precipitating mechanism, an oil-water separation mechanism and a nitrogen and phosphorus removal mechanism which are sequentially connected through a pipeline, and at least two precipitating tanks are arranged below a first water inlet pipe orifice of the filtering and precipitating mechanism; a water passing structure which is only communicated with one of the sedimentation tanks is arranged between the sedimentation tanks and the first water inlet pipe orifice, a filtering structure is detachably arranged between the water passing structure and the first sedimentation tank, and a first switch valve is arranged between the first water outlet pipe orifice of the sedimentation tank and the oil-water separation mechanism. The system can be alternately connected into a plurality of sedimentation tanks for sedimentation treatment, so that continuous wastewater treatment is ensured, and the treatment efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and particularly relates to a denitrification and phosphorus removal treatment system suitable for rural operating wastewater. Background Technique

[0002] Rural operating wastewater mainly refers to the sewage generated by some rural business premises during business activities. For example, the wastewater generated by restaurants, etc. If discharged disorderly, it will cause pollution to the local water bodies and soil, damage the ecological environment, and seriously affect people's production and life.

[0003] Operating wastewater generally has the characteristic of continuous generation within a certain period of time. At present, in the existing technology, the wastewater treatment system generally only has one treatment path. That is to say, when performing, for example, sedimentation treatment, it is necessary to temporarily stop the input of wastewater to ensure that the sedimentation treatment is always in good static conditions. In this way, the requirement of continuous treatment cannot be realized, and the wastewater treatment efficiency is not high. Content of the Utility Model

[0004] The purpose of the utility model is to propose a denitrification and phosphorus removal treatment system suitable for rural operating wastewater in view of the above problems existing in the prior art.

[0005] In order to achieve the purpose of the utility model, the following technical solutions can be adopted:

[0006] A denitrification and phosphorus removal treatment system suitable for rural operating wastewater, including a filtration and sedimentation mechanism, an oil-water separation mechanism and a denitrification and phosphorus removal mechanism connected in sequence through pipelines. At least two sedimentation tanks are arranged below the first water inlet of the filtration and sedimentation mechanism. A water passing structure for only communicating with one of the sedimentation tanks is arranged between the sedimentation tank and the first water inlet. A filtering structure is detachably arranged between the water passing structure and the first sedimentation tank. A first on-off valve is arranged between the first water outlet of the sedimentation tank and the oil-water separation mechanism.

[0007] The treatment system of the present utility model is applicable to the treatment of rural operational wastewater, such as restaurant wastewater, etc. The sedimentation tank therein is used for sedimenting suspended solids and particulate matter; the oil-water separation mechanism is located behind the sedimentation tank and is used for separating the oil in the water, improving the quality of the treated sewage, and also avoiding the influence of oil on the subsequent mechanisms; the denitrification and phosphorus removal mechanism is used for removing dissolved nitrogen and phosphorus in the water to prevent problems such as eutrophication caused by sewage discharge. Since operational wastewater such as kitchen wastewater often has the characteristic of continuous flow, and sedimentation operation requires static settlement to ensure good sedimentation effect, multiple sedimentation tanks are provided in this system. The water passing structure connects the first water inlet only to the first sedimentation tank. At this time, the second sedimentation tank can obtain good static conditions to improve the sedimentation effect. The first switch valve is used to open and close the first water outlet, so that the sedimentation tank can maintain the water storage state or enter the drainage state. After the sedimentation separation is completed and the supernatant is discharged from its first water outlet, the water passing structure can switch the connected channel. Similarly, the first sedimentation tank is subjected to sedimentation treatment, and the second sedimentation tank starts to be filled with water, and so on to realize the continuous reception and treatment of sewage. In addition, closing the connection between the first water inlet and the sedimentation tank by the water passing structure also facilitates the cleaning and maintenance of the bottom sludge of the sedimentation tank.

[0008] In the above denitrification and phosphorus removal treatment system applicable to rural operational wastewater, the water passing structure includes a water passing pipe vertically arranged with a rectangular cross-section. The first water inlet is connected to the upper end of the water passing pipe. A partition plate is vertically arranged at the lower end of the water passing pipe. Water passing channels that are only connected to one of the sedimentation tanks are respectively formed on both sides of the partition plate. The filtering structure is arranged in the water passing channels, and a diversion switching component is arranged between the partition plate and the first water inlet.

[0009] The partition plate divides the lower part of the water passing pipe into two water passing channels, and the water passing channels are in one-to-one correspondence and connection with the sedimentation tanks. The diversion switching component is used to control which water passing channel the water flows into, and thus selectively guide the water flow to a specific sedimentation tank. The filtering structure is used to intercept and filter larger suspended solids and impurities to protect the subsequent treatment units from being blocked.

[0010] In the above denitrification and phosphorus removal treatment system applicable to rural operational wastewater, the diversion switching component includes a diversion plate rotatably connected to the inside of the water passing pipe through a hinge shaft. The lower end of the diversion plate is connected to the hinge shaft, and the upper end leans against the inner side wall of the water passing pipe. The hinge shaft extends directly above the partition plate, and the extending direction is the same as the width direction of the partition plate. A switching driving component for controlling the rotation of the diversion plate is arranged on the side wall of the water passing pipe.

[0011] The guide plate is rotatably connected via an articulated shaft, and its length is greater than half the width of the water pipe. The lower end of the guide plate is located in the middle, and the upper end overlaps the inner wall of the water pipe to form an inclined guide slope, which realizes the function of controlling the wastewater entering the corresponding sedimentation tank, and the switching drive assembly is used to provide a rotational driving force. As one of the possible implementation methods, the switching drive assembly includes a drive motor, and the articulated shaft is fixedly connected to the guide plate and is transmission-connected to the output end of the drive motor. The drive motor drives the articulated shaft to rotate, thereby achieving the effect of driving the guide plate to rotate. The coordination of the drive motor articulated shaft is common knowledge and will not be further expanded.

[0012] Furthermore, the guide plate has an H-shaped cross section, and side baffles are provided on both sides of the width of the guide plate. The upper end of the side baffle is provided with a yielding slope for yielding when the upper end of the guide plate and the inner wall of the water pipe overlap.

[0013] The side baffles on the guide plate are used to prevent wastewater from leaking through the gap between the side of the guide plate and the inner wall of the water pipe; the make way slope is used to make way so that the upper end of the guide plate and the side wall of the water pipe can effectively overlap, avoiding the formation of a large gap that may cause wastewater to leak through it; ensuring that the sedimentation tank in the settling state has good static conditions.

[0014] In the above-mentioned denitrification and phosphorus removal treatment system suitable for rural commercial wastewater, the filtration structure includes a filter basket with a filter grille on the bottom surface, the filter basket is inserted into the filter basket insertion hole on the side wall of the water pipe, a filter basket supporting assembly is provided between the filter basket and the inner wall of the water pipe, and a quick fixing assembly is provided between the outer plate of the filter basket and the outer wall of the water pipe.

[0015] The filter basket is a basket-shaped structure with an open upper end. It uses a filter grille as the bottom surface to intercept larger suspended matter and impurities. The filter basket can be detachably inserted into the filter basket insertion hole to facilitate the disassembly, replacement or dumping of the filter basket. The filter basket supporting assembly is used to support the filter basket to ensure the stability of the filter basket in the vertical direction in the water pipe. The quick fixing assembly is used to quickly lock and unlock the filter basket to achieve limiting and releasing the limit of the filter basket in the insertion direction, which is convenient for disassembly and assembly.

[0016] In the above-mentioned denitrification and dephosphorization treatment system applicable to rural commercial wastewater, the height of the outer plate is greater than the height of the filter basket insertion hole, and the quick fixing component includes a strip hole penetrating through the outer plate, and a T-shaped lock buckle rotatably connected to the outer wall of the water pipe, and the lock buckle portion of the T-shaped lock buckle passes through the strip hole and rotates to fix the filter basket;

[0017] The filter basket supporting assembly includes supporting convex ribs fixedly arranged on the inner side wall of the water pipe and at least located on the left and right sides of the filter basket, and the bottom surface of the filter basket and the top surface of the supporting convex ribs are in contact with each other;

[0018] A water guiding rib is horizontally arranged above the inner side plate and the left and right side plates of the filter basket. The water guiding ribs are respectively fixed on the side wall of the partition plate and the inner side wall of the water passing pipe, and include a water guiding inclined surface located on the upper side.

[0019] The height of the outer side plate is greater than the height of the filter basket insertion hole. On the one hand, it ensures complete coverage of the filter basket insertion hole, reducing the possibility of sewage leaking between the outer side plate and the filter basket insertion hole. At the same time, a quick-fixing component can be set in the oversized area. The locking part of the T-shaped lock is rotatably connected to the water passing pipe through the connecting part. The shape of the locking part is adapted to that of the strip-shaped hole and can pass through in a parallel state. After passing through, rotating the locking part to be perpendicular can achieve effective limiting, making the installation and disassembly of the filter basket very simple and can be completed without special tools. The top surface of the supporting rib is flush with the bottom surface of the filter basket insertion hole, and the supporting rib is in contact with the bottom surface of the filter basket to provide support for the filter basket, ensuring its load-bearing capacity and stability during use. The water guiding rib is located above the left and right side plates and the inner side plate, and its water guiding inclined surface is used to guide the wastewater inward, preventing the wastewater from flowing down along the pipe wall through the gap between the side wall of the filter basket and the inner side wall of the water passing pipe, and ensuring good static conditions in the sedimentation tank below.

[0020] As an optimization, the cross-section of the water guiding rib is triangular. The lower end of the water guiding inclined surface is located between the inner side plate and the outer side plate. Further, the triangle is an obtuse triangle, with its obtuse side in contact with the side wall of the water passing pipe and the other side inclined downward.

[0021] As an optimization, the left and right side plates and the inner side plate of the filter basket are of the same height. The height of the filter basket insertion hole is adapted to the inner side plate, and the width is adapted to the width of the filter basket. A handle is fixed on the outer side plate. The handle facilitates the user to pull out the filter basket.

[0022] In the above denitrification and phosphorus removal treatment system applicable to rural operating wastewater, the oil-water separation mechanism includes an oil removal tank corresponding to each sedimentation tank. The second water inlet of the oil removal tank is connected to the first water inlet through a pipeline, and the second water outlet is connected to the denitrification and phosphorus removal mechanism through a pipeline, and a second switch valve is provided on this pipeline. An air flotation machine component and a skimming component for skimming floating oil are provided in the oil removal tank.

[0023] There are multiple oil removal ponds, which are connected to the sedimentation ponds one by one. Similarly to the sedimentation ponds, the oil removal ponds also have a water storage treatment state and a drainage state. The oil removal ponds have good oil removal operation conditions when storing water and not injecting new wastewater. The alternating operation of multiple oil removal ponds enables the continuous operation of the oil-water separation operation. When the air flotation machine component works, it injects tiny bubbles into the water and separates oil substances from the water using the air flotation principle. These bubbles attach to the oil droplets, reducing their density and causing them to rise to the water surface. The separated oil droplets gather on the water surface to form a layer of floating oil. The oil skimming component is used to collect and remove the oil layer floating on the water surface, which can be specifically realized through components such as an oil scraper or an oil skimmer. This is prior art and will not be specifically elaborated.

[0024] In the above denitrification and phosphorus removal treatment system applicable to rural operating wastewater, the air flotation machine component includes a microbubble generating device and an aeration head connected thereto, and the aeration head is arranged at the bottom of the oil removal pond;

[0025] A heating component is also arranged in the oil removal pond.

[0026] Specifically, the air flotation machine component generates microbubbles through the microbubble generating device. The microbubbles are output from the aeration head and achieve the effect of separating oil droplets during the process of rising in the water. The aeration head can specifically be in the form of a reticulated aeration pipe, and the aeration pipe is densely distributed with aeration holes, making the aeration more uniform. The heating component is used to increase the temperature of the wastewater and improve the oil removal effect. The microbubble generating device, the aeration head, and the heating component are prior art, and their specific structures and connection details will not be further elaborated.

[0027] In the above denitrification and phosphorus removal treatment system applicable to rural operating wastewater, the denitrification and phosphorus removal mechanism includes an anaerobic pond and an aerobic pond connected in sequence. A biofilm filler is arranged in the anaerobic pond through a first detachable structure, and an aerobic filler is arranged in the aerobic pond through a second detachable structure.

[0028] The denitrification and phosphorus removal mechanism consists of an anaerobic pond and an aerobic pond, which are mainly used to remove nitrogen and phosphorus from wastewater. The role of the anaerobic pond is mainly to provide an anoxic environment for microorganisms, promoting the growth activities of denitrifying bacteria and polyphosphate-accumulating bacteria. The biofilm filler can provide an attachment point for microorganisms to form a biofilm, which helps to improve the treatment efficiency. The aerobic pond is connected immediately after the anaerobic pond. It provides an oxygen-rich environment, which is beneficial to the growth of aerobic microorganisms such as nitrifying bacteria. The aerobic filler in the aerobic pond is also used to increase the attachment area of microorganisms and improve the treatment efficiency. Nitrifying bacteria convert ammonia nitrogen into nitrite and nitrate. The first detachable structure and the second detachable structure make the corresponding fillers convenient for regular cleaning or replacement, which helps to maintain the efficient operation of the system.

[0029] In the above nitrogen and phosphorus removal treatment system applicable to rural operating wastewater, the first detachable structure includes a number of V-shaped mounting platforms arranged on the inner walls of two opposite sides of the anaerobic tank. The two ends of the mounting rod are supported between the mounting platforms. The biofilm filler includes bio ropes inoculated with biofilms. The bio ropes are hooked on the support rod through the connecting hooks at the upper ends.

[0030] The V-shaped mounting platform can better support the mounting rod and ensure its stability. The two ends of the mounting rod are respectively supported on the V-shaped mounting platforms on both sides, forming a support structure spanning the anaerobic tank. The mounting rod can be easily placed or removed as needed, thus realizing the quick installation and disassembly of a group of bio ropes on the same mounting rod. In addition, the bio ropes are hooked on the mounting rod through the connecting hooks, which can realize the quick installation and disassembly of specific single bio ropes. The first detachable structure realizes the effect of regularly cleaning or replacing one or a group of bio ropes according to specific needs. The bio ropes and biofilms are common knowledge and will not be specifically elaborated.

[0031] In the above nitrogen and phosphorus removal treatment system applicable to rural operating wastewater, the second detachable structure includes a loading basket with an open upper end. The loading basket is filled with aerobic filler. The bottom plate of the loading basket is densely provided with mesh holes through which the aerobic filler cannot pass but water can leak out. A supporting platform is provided on the inner side wall of the aerobic tank. The bottom surface of the loading basket abuts against the top surface of the supporting platform. A lifting frame for lifting the loading basket is provided at the upper end of the loading basket.

[0032] The aerobic filler is filled in the loading basket. The mesh holes at the bottom of the basket allow the treated wastewater to pass through but prevent the leakage of the filler. The loading basket is directly placed on the supporting platform, with stable placement and good detachability. The lifting frame is used to conveniently lift the loading basket, further facilitating disassembly, assembly and subsequent maintenance. The aerobic filler is common knowledge, and its specific selection and principle will not be specifically elaborated.

[0033] As an optimization, the cross-sectional shape and size of the loading basket are adapted to the cross-sectional shape and size of the aerobic tank. This ensures that the loading basket can be smoothly installed into the aerobic tank, and the gap between it and the side wall of the aerobic tank is small, making full use of the lateral space of the aerobic tank and also making the placement of the loading basket more stable.

[0034] Compared with the prior art, the utility model mainly has the following advantages:

[0035] 1. The system is provided with multiple sedimentation tanks. The water passing structure connects the first water inlet pipe only to the first sedimentation tank. At this time, the second sedimentation tank can obtain good static conditions, improving the sedimentation effect. The first switch valve is used to open and close the first water outlet pipe, enabling the sedimentation tank to maintain a water storage state or enter a drainage state. After the sedimentation separation is completed and the supernatant is discharged from its first water outlet pipe, the water passing structure can switch the connected channel. Similarly, the first sedimentation tank is subjected to sedimentation treatment, while the second sedimentation tank starts to be filled with water, and so on to continuously receive and treat sewage. In addition, closing the connection between the first water inlet pipe and the sedimentation tank by the water passing structure also facilitates the cleaning and maintenance of the bottom sludge of the sedimentation tank.

[0036] 2. The filter basket is detachably inserted into the filter basket insertion hole, facilitating the disassembly, replacement, or dumping of the filtered substances; the filter basket support assembly is used to support the filter basket to ensure the stability of the filter basket in the vertical direction in the water passing pipe; the quick-fixing assembly is used to quickly lock and unlock the filter basket, realizing the limit and release of the limit of the filter basket in the insertion direction, facilitating disassembly and assembly.

[0037] 3. The height of the outer side plate is greater than the height of the filter basket insertion hole. On the one hand, it ensures complete coverage of the filter basket insertion hole, reducing the possibility of sewage leaking between the outer side plate and the filter basket insertion hole. At the same time, the quick-fixing assembly can be set in the larger-sized area. The cooperation of the T-shaped lock and the strip hole makes the installation and disassembly of the filter basket very simple and can be completed without special tools.

[0038] 4. The water guiding rib is located above the left and right side plates and the inner side plate, and its water guiding inclined surface is used to guide the wastewater inward, preventing the wastewater from flowing down along the pipe wall through the gap between the side wall of the filter basket and the inner side wall of the water passing pipe, ensuring good static conditions in the lower sedimentation tank.

[0039] 5. Multiple oil removal tanks are provided and are connected to the sedimentation tanks one by one. Similarly to the sedimentation tanks, the oil removal tanks also have a water storage treatment state and a drainage state. The oil removal tanks have good oil removal operation conditions in the state of storing water and not injecting new wastewater. The alternating operation of multiple oil removal tanks enables the oil-water separation operation to continue.

[0040] 6. The biological membrane filler and the aerobic filler are respectively arranged in the tank through the first detachable structure and the second detachable structure, facilitating regular cleaning or replacement and helping to maintain the efficient operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is the top view schematic diagram of the overall structure provided by the present utility model;

[0042] Figure 2 is the structural schematic diagram of the filtration and sedimentation mechanism provided by the present utility model;

[0043] Figure 3 is Figure 2Enlarged view of the details at A in the [Chinese context]

[0044] Figure 4 It is a schematic structural diagram of the oil-water separation mechanism provided by the present utility model;

[0045] Figure 5 It is a schematic structural diagram of the anaerobic tank provided by the present utility model;

[0046] Figure 6 It is a schematic structural diagram of the aerobic tank provided by the present utility model.

[0047] In the figure, the filtration and sedimentation mechanism 1, sedimentation tank 11, first water inlet pipe 12, water passing structure 13, filtration structure 14, first switch valve 15, water passing pipe 16, partition plate 17, water passing channel 18, diversion switching assembly 19, hinge shaft 20, diversion plate 21, side baffle 22, relief inclined plane 23, filter basket 24, filter basket insertion hole 25, filter basket supporting assembly 26, quick fixing assembly 27, outer side plate 28, strip hole 29, T-shaped lock 30, supporting rib 31, inner side plate 32, water guiding rib 33, water guiding inclined plane 34, first water outlet pipe 35, filter grille 36,

[0048] The oil-water separation mechanism 4, oil removal tank 41, second water inlet pipe 42, second switch valve 43, air flotation machine assembly 44, microbubble generating device 45, aeration head 46, heating assembly 47, second water outlet pipe 48,

[0049] The denitrification and phosphorus removal mechanism 5, anaerobic tank 51, aerobic tank 52, first detachable structure 53, installation platform 54, installation rod 55, biological rope 56, connecting hook 57, second detachable structure 58, loading basket 59, aerobic filler 60, supporting platform 61, lifting frame 62. Detailed implementation manners

[0050] The following are specific embodiments of the present utility model and in combination with the attached drawings, the technical solutions of the present utility model are further described, but the present utility model is not limited to these embodiments.

[0051] Specific embodiments are as Figures 1-6 As shown, the denitrification and phosphorus removal treatment system for rural operating wastewater of the present application includes a filtration and sedimentation mechanism 1, an oil-water separation mechanism 4, and a denitrification and phosphorus removal mechanism 5 connected in sequence through pipelines. There are two sedimentation tanks 11 below the first water inlet pipe 12 of the filtration and sedimentation mechanism 1. A water passing structure 13 for only communicating with one of the sedimentation tanks 11 is provided between the sedimentation tank 11 and the first water inlet pipe 12. A filtration structure 14 is detachably arranged between the water passing structure 13 and the first sedimentation tank 11. A first switch valve 15 is provided between the first water outlet pipe 35 of the sedimentation tank 11 and the oil-water separation mechanism 4.

[0052] Specifically, the treatment system of the utility model is suitable for the treatment of rural commercial wastewater, especially restaurant wastewater, wherein the sedimentation tank 11 is used to settle suspended solids and particulate matter; the oil-water separation mechanism is located after the sedimentation tank 11, and is used to separate oil and fat in the water, thereby improving the quality of the treated wastewater and avoiding the impact of oil on subsequent mechanisms; the denitrification and phosphorus removal mechanism 5 is used to remove dissolved nitrogen and phosphorus in the water to prevent problems such as eutrophication caused by sewage discharge. Since commercial wastewater such as kitchen wastewater often has the characteristics of continuous flow, and the sedimentation operation needs to be left to stand to ensure a good sedimentation effect, the system is provided with multiple sedimentation tanks 11. The water-passing structure 13 connects the first water inlet pipe 12 only with the first sedimentation tank 11. At this time, the second sedimentation tank 11 can obtain good standing conditions and improve the sedimentation effect. The first switch valve 15 is used to switch the first water outlet pipe 35 so that the sedimentation tank 11 maintains a water storage state or enters a drainage state. After the sedimentation separation is completed and the first water outlet pipe 35 discharges the supernatant, the water-passing structure 13 can switch the connected channel. Similarly, the first sedimentation tank 11 is subjected to sedimentation treatment, and the second sedimentation tank 11 starts to be filled with water, and the continuous reception and treatment of sewage is achieved in this way. In addition, the water-passing structure 13 closes the connection between the first water inlet pipe 12 and the sedimentation tank 11, which also facilitates the cleaning and maintenance of the sedimentation tank 11.

[0053] like Figures 1-3 As shown, the water flow structure 13 includes a water flow pipe 16 which is vertically arranged and has a rectangular cross section, the first water inlet pipe port 12 is connected to the upper end of the water flow pipe 16, a partition plate 17 is vertically arranged at the lower end of the water flow pipe 16, and water flow channels 18 connected to only one of the sedimentation tanks 11 are formed on both sides of the partition plate 17, and a filter structure 14 is arranged in the water flow channel 18, and a diversion switching component 19 is arranged between the partition plate 17 and the first water inlet pipe port 12. The diversion switching component 19 includes a diversion plate 21 which is rotatably connected to the water flow pipe 16 through a hinge shaft 20, the lower end of the diversion plate 21 is connected to the hinge shaft 20, and the upper end rests on the inner side wall of the water flow pipe 16, the hinge shaft 20 extends and is located directly above the partition plate 17, and the extension direction is consistent with the width direction of the partition plate 17, and a switching drive component for controlling the rotation of the diversion plate 21 is arranged on the side wall of the water flow pipe 16. The guide plate 21 has an H-shaped cross section. Side baffles 22 are provided on both sides of the width of the guide plate 21. The upper ends of the side baffles 22 are provided with a yielding slope 23 for yielding when the upper end of the guide plate 21 overlaps the inner wall of the water pipe 16.

[0054] Specifically, the partition plate 17 divides the lower part of the water pipe 16 into two water channels 18, and the water channels 18 and the sedimentation tank 11 are connected one by one. The diversion switching assembly 19 is used to control which water channel 18 the water flows into, and then selectively directs the water flow to a specific sedimentation tank 11. The filter structure 14 is used to intercept and filter larger suspended matter and impurities to protect the subsequent treatment unit from clogging. The guide plate 21 is rotatably connected through the hinge shaft 20, and its length is greater than half the width of the water pipe 16. The lower end of the guide plate 21 is located in the middle, and the upper end overlaps with the inner wall of the water pipe 16 to form an inclined diversion slope, which realizes the function of controlling the wastewater to enter the corresponding sedimentation tank 11, and the switching drive assembly is used to provide a rotational driving force. As one of the possible implementation methods, the switching drive assembly includes a drive motor, the hinge shaft 20 is fixedly connected to the guide plate 21, and is transmission-connected to the output end of the drive motor, and the hinge shaft 20 is driven by the drive motor to rotate, thereby achieving the effect of driving the guide plate 21 to rotate. The side baffle 22 on the guide plate 21 is used to prevent wastewater from leaking from the gap between the side of the guide plate 21 and the inner wall of the water pipe 16; the make way slope 23 is used to make way so that the upper end of the guide plate 21 and the side wall of the water pipe 16 can effectively overlap to avoid the formation of a large gap that causes wastewater to leak therethrough; and to ensure that the sedimentation tank 11 in the settling state has good static conditions.

[0055] like Figure 2 , 3 As shown, the filter structure 14 includes a filter basket 24 with a filter grille 36 on the bottom surface. The filter basket 24 is inserted into the filter basket insertion hole 25 on the side wall of the water pipe 16. A filter basket supporting assembly 26 is provided between the filter basket 24 and the inner wall of the water pipe 16, and a quick fixing assembly 27 is provided between the outer plate 28 of the filter basket 24 and the outer wall of the water pipe 16. The height of the outer plate 28 is greater than the height of the filter basket insertion hole 25. The quick fixing component 27 includes a strip hole 29 that passes through the outer plate 28, and a T-shaped lock buckle 30 that is rotatably connected to the outer wall of the water pipe 16. The lock portion of the T-shaped lock buckle 30 passes through the strip hole 29 and rotates to fix the filter basket 24; the filter basket supporting component 26 includes a supporting rib 31 that is fixed on the inner wall of the water pipe 16 and is located at least on the left and right sides of the filter basket 24, and the bottom surface of the filter basket 24 is in contact with the top surface of the supporting rib 31; water guide ribs 33 are horizontally arranged above the inner plate 32 and the left and right side plates of the filter basket 24. The water guide ribs 33 are respectively fixed on the side wall of the partition plate 17 and the inner wall of the water pipe 16, including a water guide slope 34 located on the upper side.

[0056] Specifically, the filter basket 24 is a basket-shaped structure with an open upper end. It uses a filter grille 36 as the bottom surface to intercept larger suspended solids and impurities. The filter basket 24 is detachably inserted into the filter basket insertion hole 25, facilitating the disassembly, replacement, or dumping of the filtered substances. The filter basket support assembly 26 is used to support the filter basket 24 to ensure the stability of the filter basket 24 in the vertical direction in the water pipe 16. The quick-fixing assembly 27 is used to quickly lock and unlock the filter basket 24, realizing the limit and release of the filter basket 24 in the insertion direction, and facilitating disassembly and assembly. The height of the outer side plate 28 is greater than the height of the filter basket insertion hole 25. On the one hand, it ensures complete coverage of the filter basket insertion hole, reducing the possibility of sewage leaking between the outer side plate 28 and the filter basket insertion hole 25. At the same time, the quick-fixing assembly 27 can be set in the oversized area. The locking part of the T-shaped lock 30 is rotatably connected to the water pipe 16 through the connecting part. The shape of the locking part is adapted to that of the strip hole 29 and can pass through in a parallel state. After passing through, rotating the locking part to be perpendicular can achieve effective limitation, making the installation and disassembly of the filter basket 24 very simple and can be completed without special tools. The top surface of the supporting rib 31 is flush with the bottom surface of the filter basket insertion hole 25. The supporting rib 31 is in contact with the bottom surface of the filter basket 24 to provide support for the filter basket 24 and ensure its load-bearing capacity and stability during use. The water guiding rib 33 is located above the left and right side plates and the inner side plate 32. Its water guiding inclined surface 34 is used to guide the wastewater inward, preventing the wastewater from flowing down along the pipe wall through the gap between the side wall of the filter basket 24 and the inner side wall of the water pipe 16, and ensuring good static conditions in the sedimentation tank 11 below.

[0057] Further, the cross-section of the water guiding rib 33 is an obtuse triangle. One side of its obtuse angle is in contact with the side wall of the water pipe 16, and the other side slopes downward. The lower end of the water guiding inclined surface 34 is located between the inner side plate 32 and the outer side plate 28.

[0058] As an optimization of this embodiment, the left and right side plates of the filter basket 24 and the inner side plate 32 are of the same height. The height of the filter basket insertion hole 25 is adapted to that of the inner side plate 32, and the width is adapted to the width of the filter basket 24. A handle is fixedly installed on the outer side plate 28. The handle facilitates the user to pull out the filter basket 24.

[0059] As Figure 1 、 4 shown, the oil-water separation mechanism includes an oil removal tank 41 corresponding to the sedimentation tank 11 one by one. The second water inlet of the oil removal tank 41 and the first water inlet 12 are connected by a pipeline. The second water outlet 48 and the denitrification and dephosphorization mechanism 5 are connected by a pipeline, and a second switch valve 43 is provided on this pipeline. An air flotation machine assembly 44 and an oil skimming assembly for skimming floating oil are provided in the oil removal tank 41. The air flotation machine assembly 44 includes a microbubble generating device 45 and an aeration head 46 connected thereto. The aeration head 46 is arranged at the bottom of the oil removal tank 41. A heating assembly 47 is also provided in the oil removal tank 41.

[0060] Specifically, there are 2 sets of oil removal tanks 41, which are connected to the sedimentation tanks 11 in a one-to-one correspondence. Similar to the sedimentation tanks 11, the oil removal tanks 41 also have a water storage treatment state and a drainage state. The oil removal tanks 41 have good oil removal operation conditions in the state of storing water without injecting new wastewater. The multiple oil removal tanks 41 operate alternately, enabling the oil-water separation operation to continue. When the air flotation machine assembly 44 works, it injects tiny bubbles into the water. Using the air flotation principle, the oil substances are separated from the water. These bubbles attach to the oil droplets, reducing their density and causing them to rise to the water surface. The separated oil droplets gather on the water surface to form a layer of floating oil. The skimming assembly (not shown in the figure) is used to collect and remove the oil layer floating on the water surface. Specifically, the air flotation machine assembly 44 generates microbubbles through the microbubble generating device 45. The microbubbles are output from the aeration head 46 and achieve the effect of separating oil droplets during the process of rising in the water. The aeration head 46 can specifically be in the form of a mesh aeration pipe, and the aeration pipe is densely distributed with aeration holes, making the aeration more uniform. The heating assembly 47 is used to increase the temperature of the wastewater and improve the oil removal effect.

[0061] As Figure 1 、 5 、as shown in 6, the denitrification and phosphorus removal mechanism 5 includes an anaerobic tank 51 and an aerobic tank 52 connected in sequence. A biological film filler is arranged in the anaerobic tank 51 through the first detachable structure 53, and an aerobic filler 60 is arranged in the aerobic tank 52 through the second detachable structure 58.

[0062] Specifically, the denitrification and phosphorus removal mechanism 5 is composed of an anaerobic tank 51 and an aerobic tank 52, mainly used to remove nitrogen and phosphorus in the wastewater. The role of the anaerobic tank 51 is mainly to provide an anoxic environment for microorganisms, promoting the growth activities of denitrifying bacteria and polyphosphate-accumulating bacteria. The biological film filler can provide attachment points for microorganisms to form a biological film, which helps to improve the treatment efficiency. The aerobic tank 52 is connected immediately after the anaerobic tank 51. It provides an oxygen-rich environment, which is beneficial to the growth of aerobic microorganisms such as nitrifying bacteria. The aerobic filler 60 in the aerobic tank 52 is also to increase the attachment area of microorganisms and improve the treatment efficiency. The nitrifying bacteria convert ammonia nitrogen into nitrite and nitrate. The first detachable structure 53 and the second detachable structure 58 make the corresponding fillers easy to clean or replace regularly, which helps to maintain the efficient operation of the system.

[0063] In this embodiment, the first detachable structure 53 includes several groups of V-shaped mounting platforms 54 arranged on the two pairs of inner walls of the anaerobic tank 51. The two ends of the mounting rod 55 are placed between the mounting platforms 54. The biological film filler includes biological ropes 56 inoculated with biological films, and the biological ropes 56 are hooked on the mounting rod through the connecting hooks 57 at the upper ends.

[0064] Specifically, the installation platform 54 being V-shaped can better support the installation rod 55 and ensure its stability. The two ends of the installation rod 55 are respectively placed on the V-shaped installation platforms 54 on both sides, forming a support structure spanning across the anaerobic pond 51. The installation rod 55 can be easily placed or removed as needed, thereby enabling the quick installation and disassembly of a group of biological ropes 56 on the same installation rod 55. In addition, the biological ropes 56 are hooked on the installation rod 55 through the connecting hooks 57, enabling the quick installation and disassembly of a specific single biological rope 56. The first detachable structure 53 achieves the effect of being able to regularly clean or replace one or a group of biological ropes 56 according to specific needs.

[0065] In this embodiment, the second detachable structure 58 includes a loading basket 59 with an open upper end. The loading basket 59 is filled with aerobic fillers 60. The bottom plate of the loading basket 59 is densely provided with mesh holes through which the aerobic fillers 60 cannot pass but water can leak out. A supporting platform 61 is provided on the inner side wall of the aerobic pond 52. The bottom surface of the loading basket 59 abuts against the top surface of the supporting platform 61. A lifting frame 62 for lifting the loading basket 59 is provided at the upper end of the loading basket 59.

[0066] Specifically, the aerobic fillers 60 are filled in the loading basket 59. The mesh holes at the bottom of the basket enable the treated wastewater to pass through but prevent the leakage of the fillers. The loading basket 59 is directly placed on the supporting platform 61, with stable placement and good detachability. The lifting frame 62 is used to conveniently lift the loading basket 59, further facilitating disassembly and subsequent maintenance. As an optimization, the cross-sectional shape and size of the loading basket 59 are adapted to the cross-sectional shape and size of the aerobic pond 52. This ensures that the loading basket 59 can be smoothly installed into the aerobic pond 52, and the gap between it and the side wall of the aerobic pond 52 is small, making full use of the lateral space of the aerobic pond 52 and also making the placement of the loading basket 59 more stable.

[0067] Specific working principle: Wastewater is input into the filtration and sedimentation mechanism 1 from the first water inlet 12. Under the guidance of the guide plate 21, the wastewater is filtered by the filter basket 24 in the corresponding water passage 18 and then injected into the first sedimentation pond 11. At this time, both first switching valves 15 are in the closed state. The wastewater accumulated in the second sedimentation pond 11 is allowed to settle. After the preset sedimentation time, the first switching valve 15 of the second sedimentation pond 11 is opened, and the supernatant is output to the corresponding second oil removal pond 41. After all the output is completed, this first switching valve 15 is closed, and the guide plate rotates to a state with the opposite inclination direction. The wastewater is filtered by the filter basket 24 in another water passage 18 and then injected into the second sedimentation pond 11. At this time, the first sedimentation pond 11 enters the static sedimentation operation, and then enters a similar cycle.

[0068] For the oil-water separation mechanism 4, the wastewater after filtration and sedimentation treatment is input into the second oil removal tank 41. At this time, the second switching valves 43 are all in the closed state. The wastewater accumulated in the first oil removal tank 41 is undergoing air flotation separation and skimming operations. After the oil removal is completed, the second switching valve 43 of the first oil removal tank 41 is opened, and the treated wastewater is output to the subsequent denitrification and dephosphorization mechanism 5. After all the wastewater is output, the second switching valve 43 is closed. Then, after the wastewater in the first sedimentation tank 11 is treated, it is input into the first oil removal tank 41, and at the same time, the second oil removal tank 41 starts to enter the air flotation separation and skimming treatment. Then, it enters the same cycle.

[0069] The wastewater after filtration, sedimentation, and oil removal treatment flows through the anaerobic tank 51 and the aerobic tank 52 in sequence to complete the denitrification and dephosphorization operations. After the treatment is completed, it can be discharged or utilized accordingly after passing the sampling inspection.

[0070] When there is too much solid filter residue accumulated in the filter basket 24, take advantage of the opportunity when the corresponding water passage 18 is closed, turn the T-shaped lock 30, pull out the filter basket 24, pour out the filter residue, and after corresponding cleaning, reinstall it.

[0071] When too much bottom mud accumulates in the sedimentation tank 11, take advantage of the opportunity when the supernatant has just been drained and no wastewater has started to be injected, and the operator can treat the bottom mud.

[0072] The specific embodiments described in this article are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A denitrification and phosphorus removal treatment system suitable for rural commercial wastewater, characterized in that: The invention comprises a filtering and settling mechanism (1), an oil-water separation mechanism (4) and a denitrification and dephosphorization mechanism (5) which are connected in sequence through pipelines. At least two sedimentation tanks (11) are arranged below a first water inlet pipe opening (12) of the filtering and settling mechanism (1). A water flow structure (13) for communicating with only one of the sedimentation tanks (11) is arranged between the sedimentation tanks (11) and the first water inlet pipe opening (12). A filtering structure (14) is detachably arranged between the water flow structure (13) and the first sedimentation tank (11). A first switch valve (15) is arranged between a first water outlet pipe opening (35) of the sedimentation tank (11) and the oil-water separation mechanism (4).

2. The denitrification and phosphorus removal treatment system suitable for rural commercial wastewater according to claim 1 is characterized in that: The water flow structure (13) comprises a water flow pipe (16) which is arranged vertically and has a rectangular cross section. The first water inlet pipe opening (12) is connected to the upper end of the water flow pipe (16). A partition plate (17) is arranged vertically at the lower end of the water flow pipe (16). Water flow channels (18) which are connected to only one of the sedimentation tanks (11) are formed on both sides of the partition plate (17). The filtering structure (14) is arranged in the water flow channel (18). A flow guide switching component (19) is arranged between the partition plate (17) and the first water inlet pipe opening (12).

3. The denitrification and phosphorus removal treatment system suitable for rural commercial wastewater according to claim 2 is characterized in that: The diversion switching assembly (19) comprises a diversion plate (21) rotatably connected to the water pipe (16) via a hinge shaft (20); the lower end of the diversion plate (21) is connected to the hinge shaft (20), and the upper end rests on the inner wall of the water pipe (16); the hinge shaft (20) extends to be located directly above the partition plate (17), and the extension direction is consistent with the width direction of the partition plate (17); and a switching drive assembly for controlling the rotation of the diversion plate (21) is provided on the side wall of the water pipe (16).

4. The denitrification and phosphorus removal treatment system suitable for rural commercial wastewater according to claim 2 is characterized in that: The filtering structure (14) comprises a filter basket (24) whose bottom surface is a filter grille (36); the filter basket (24) is inserted into a filter basket insertion hole (25) on the side wall of the water pipe (16); a filter basket supporting component (26) is provided between the filter basket (24) and the inner wall of the water pipe (16); and a quick fixing component (27) is provided between the outer plate (28) of the filter basket (24) and the outer wall of the water pipe (16).

5. The denitrification and phosphorus removal treatment system suitable for rural commercial wastewater according to claim 4 is characterized in that: The height of the outer plate (28) is greater than the height of the filter basket insertion hole (25); the quick fixing assembly (27) comprises a strip hole (29) penetrating the outer plate (28) and a T-shaped lock (30) rotatably connected to the outer wall of the water pipe (16); the lock portion of the T-shaped lock (30) passes through the strip hole (29) and rotates to fix the filter basket (24); The filter basket supporting assembly (26) comprises supporting convex ribs (31) fixedly mounted on the inner wall of the water pipe (16) and located at least on the left and right sides of the filter basket (24); the bottom surface of the filter basket (24) and the top surface of the supporting convex ribs (31) are in contact with each other; Water guide ribs (33) are horizontally arranged above the inner plate (32) and the left and right side plates of the filter basket (24). The water guide ribs (33) are respectively fixed to the side wall of the partition plate (17) and the inner wall of the water pipe (16), and include a water guide inclined surface (34) located on the upper side.

6. The denitrification and phosphorus removal treatment system suitable for rural commercial wastewater according to claim 1 is characterized in that: The oil-water separation mechanism (4) comprises an oil removal tank (41) corresponding to the sedimentation tank (11) in a one-to-one manner, the second water inlet (42) of the oil removal tank (41) and the first water inlet (12) are connected via a pipeline, the second water outlet (48) and the denitrification and dephosphorization mechanism (5) are connected via a pipeline, and a second switch valve (43) is provided on the pipeline, and an air flotation machine component (44) and an oil skimming component for skimming floating oil are provided in the oil removal tank (41).

7. The denitrification and phosphorus removal treatment system for rural commercial wastewater according to claim 6 is characterized in that: The air flotation machine assembly (44) comprises a micro-bubble generating device (45) and an aeration head (46) connected thereto, wherein the aeration head (46) is arranged at the bottom of the degreasing tank (41); A heating component (47) is also provided in the degreasing pool (41).

8. The denitrification and phosphorus removal treatment system for rural commercial wastewater according to claim 1 is characterized in that: The denitrification and phosphorus removal mechanism (5) comprises an anaerobic tank (51) and an aerobic tank (52) connected in sequence, wherein the anaerobic tank (51) is provided with a biofilm filler via a first detachable structure (53), and the aerobic tank (52) is provided with an aerobic filler (60) via a second detachable structure (58).

9. The denitrification and phosphorus removal treatment system for rural commercial wastewater according to claim 8, characterized in that: The first detachable structure (53) includes a plurality of groups of V-shaped mounting platforms (54) arranged on the inner walls of two opposite sides of the anaerobic tank (51), and the two ends of the mounting rod (55) are mounted between the mounting platforms (54). The biofilm filler includes a bio-rope (56) inoculated with a biofilm, and the bio-rope (56) is hooked on the mounting rod through a connecting hook (57) at the upper end.

10. The denitrification and phosphorus removal treatment system for rural commercial wastewater according to claim 8, characterized in that: The second detachable structure (58) comprises a loading basket (59) with an open upper end, wherein the loading basket (59) is filled with aerobic fillers (60), and the bottom plate of the loading basket (59) is densely covered with mesh holes through which the aerobic fillers (60) cannot pass but water can leak out, and a supporting platform (61) is provided on the inner side wall of the aerobic pool (52), the bottom surface of the loading basket (59) and the top surface of the supporting platform (61) are in contact with each other, and a lifting frame (62) for lifting the loading basket (59) is provided at the upper end of the loading basket (59).

Images