Multi-stage efficient nitrogen and phosphorus removal rural domestic sewage treatment system

Abstract

The invention belongs to the technical field of sewage treatment, particularly relates to a multistage efficient nitrogen and phosphorus removal rural domestic sewage treatment system, and solves the problems of large occupied area, high operation cost and inflexible operation and maintenance. The treatment system comprises a treatment pool body and a transition pool body, the treatment pool body comprises at least two groups of pretreatment pools, anaerobic pools and aerobic pools which are distributed from top to bottom, and the transition pool body comprises a first middle pool located between the pretreatment pools and the anaerobic pools and a second middle pool located between the anaerobic pools and the aerobic pools. The pretreatment tank, the first middle tank, the anaerobic tank, the second middle tank and the aerobic tank are sequentially communicated, an equipment area for mounting a temperature adjusting device and an aeration device is arranged between the bottom surface of the anaerobic tank and the aerobic tank, and a temperature measuring head and a temperature control assembly of the temperature adjusting device are respectively inserted into the first middle tank and the second middle tank; an aeration pipe of the aeration device is inserted into the bottom of the aerobic tank. The effects of small occupied area, low operation cost and flexible operation and maintenance are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system. Background Art

[0002] Rural domestic sewage refers to the sewage generated by rural residents in their daily life activities, mainly including flushing toilets, washing, bathing and kitchen drainage, etc. It has the characteristics of small total amount and relatively scattered. The efficient treatment of rural domestic sewage is an important measure to protect the rural ecological environment and improve the quality of life of residents.

[0003] In the current existing technology, domestic sewage treatment systems are mostly implemented through large-scale treatment pools, which occupy a large area and have high construction costs. The flow of sewage between them requires power from more pump components, which has high operating costs. In addition, most of the treatment pools are connected one-to-one, that is, the treatment rates of the upstream and downstream treatment pools are matched and correlated, which is not conducive to independent maintenance of a certain link in the middle and lacks flexibility. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system.

[0005] In order to achieve the purpose of the invention, the following technical solutions can be used:

[0006] A multi-stage high-efficiency denitrification and dephosphorization rural domestic sewage treatment system comprises a treatment tank body and a transition tank body located on the side of the treatment tank body, wherein the treatment tank body comprises at least two groups of pretreatment tanks, anaerobic tanks and aerobic tanks arranged side by side and distributed from top to bottom, the transition tank body comprises a first intermediate tank located between the pretreatment tank and the anaerobic tank, and a second intermediate tank located between the anaerobic tank and the aerobic tank, the pretreatment tank, the first intermediate tank, the anaerobic tank, the second intermediate tank and the aerobic tank are connected in sequence through connecting pipes, an equipment area for installing a temperature regulating device and an aeration device is provided between the bottom surface of the anaerobic tank and the aerobic tank, the temperature measuring head and the temperature control component of the temperature regulating device are respectively extended into the first intermediate tank and the second intermediate tank, and the aeration pipe of the aeration device is extended into the bottom of the aerobic tank.

[0007] The sewage treatment system of the present invention efficiently removes pollutants such as nitrogen and phosphorus in sewage through multi-stage treatment steps of pretreatment, anaerobic treatment and aerobic treatment. The treatment tank body is used to carry out specific purification treatment on sewage. The pretreatment tank performs filtration and sedimentation treatment to remove solid suspended matter in sewage to avoid affecting the treatment efficiency of subsequent treatment units; the anaerobic tank performs anaerobic reaction through corresponding fillers to convert organic nitrogen into ammonia nitrogen and decompose organic matter, and the aerobic reaction performs nitrification reaction and phosphorus absorption through corresponding fillers to achieve the goal of further nitrogen and phosphorus removal. The transition tank body is arranged on the side and can play a transition buffer role in the middle. Each tank of the treatment tank body is provided with multiple tanks, which are respectively connected to the corresponding transition tank bodies, reducing the correlation between the treatment rates of the anaerobic tank and the aerobic tank, and between the pretreatment tank and the anaerobic tank, that is, temporarily disconnecting one of the pretreatment tanks, anaerobic tanks or aerobic tanks does not affect the smooth operation of the whole, and improves the flexibility of inspection and maintenance. Moreover, since the first intermediate tank and the second intermediate tank are staggeredly distributed between the pretreatment tank, the anaerobic tank and the aerobic tank, the height difference between them provides power for the flow of sewage, and a certain space is formed between the bottom and the bottom surface of the second treatment tank. This space can be used as an equipment area for arranging corresponding equipment, which has the function of shading from the sun and rain and prolonging the service life of the equipment. The equipment may include a temperature regulating device and an aeration device. The temperature regulating device is used to control the temperature of the sewage in the first intermediate tank and the second intermediate tank to ensure the treatment efficiency of the downstream treatment unit. The aeration device is used to aerate the aerobic tank to ensure the efficient aerobic reaction. In addition, the pretreatment tank, anaerobic tank and aerobic tank, as well as the first treatment tank and the second treatment tank are all vertically distributed, with compact structure and small footprint. An S-shaped treatment channel is formed between the pretreatment tank, the first intermediate tank, the anaerobic tank, the second intermediate tank and the aerobic tank, and the flow can be achieved through the height difference. There is no need to set up a pump assembly separately, which reduces the operating cost. In addition, the equipment area is located below the transition tank body, which is convenient for the temperature measuring head and temperature control assembly of the temperature regulating device to be inserted into the corresponding intermediate tank. The equipment area is also located on the side of the lower part of the aerobic tank, which is convenient for the aeration pipe of the aeration device to be inserted into the aerobic tank, thereby improving the rationality of the layout. The temperature regulating device and the aeration device are prior art and will not be elaborated in detail.

[0008] In the above-mentioned multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system, the upper end of the pretreatment tank is open and connected to the bottom of the sewage pipe respectively. The pretreatment tank is provided with filter grilles and filter filler layers above and below. The outer side of the filter grille is overlapped on the first boss on the inner wall of the pretreatment tank. The filter filler layer includes a first supporting mesh plate and a sand filter filler filled above the first supporting mesh plate. The outer side of the first supporting mesh plate is overlapped on the second boss on the inner wall of the pretreatment tank. A sedimentation area is formed below the first supporting mesh plate, and the sedimentation area is connected to the upper part of the first intermediate tank through the pretreatment outlet pipe.

[0009] The upper end of the pretreatment tank is open, which is convenient for the disassembly and assembly of the filter grille and the filter filler layer as well as daily maintenance and inspection. The sewage pipe is connected to the top of the pretreatment tank for inputting sewage to be treated. The filter grille is used to intercept larger suspended matter, floating matter and other impurities in the sewage. It is placed on the first boss, firmly installed and flexible to disassemble. The first supporting mesh plate is used to carry the sand filter filler. The sand filter filler further removes suspended matter, colloids and other tiny particles in the sewage through its good filtering performance. The first supporting mesh plate is overlapped on the second boss, which is easy to disassemble and ensure the replaceability of the sand filter filler. A sedimentation area is formed between the first supporting mesh plate and the bottom of the pretreatment tank. This area is used to collect and process the sludge and particulate matter settled after passing through the filter grille and the filter filler layer. The pretreatment outlet pipe is used to introduce the sewage after preliminary filtration and sedimentation treatment into the first intermediate tank downstream.

[0010] In the above-mentioned multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system, a plurality of cross bars are arranged side by side in the anaerobic tank, the two ends of the cross bars are overlapped on the overlap platform on the inner wall of the anaerobic tank, a plurality of biological ropes are hung on the cross bars, and the biological ropes are inoculated with biofilms. The upper part of the anaerobic tank is connected with the lower part of the first intermediate tank through the anaerobic water inlet pipe, and the side wall of the lower part of the anaerobic tank is connected with the upper part of the second intermediate tank through the anaerobic water outlet pipe; the overlap platform includes an arc-shaped overlap interface, and a guide groove with a larger upper part and a smaller lower part is provided on the side wall of the anaerobic tank above the overlap interface.

[0011] The two ends of the cross bar are overlapped on the overlapping platform, which is flexible to assemble and disassemble. The biological rope is hung on the cross bar, providing a surface for microorganisms to attach and grow. The corresponding anaerobic bacteria and other microorganisms of the biofilm can achieve the corresponding ammonia nitrogen conversion and organic matter decomposition and phosphorus treatment effects under anaerobic conditions. The upper end surface of the overlapping platform is provided with an arc-shaped overlapping interface to ensure the stability of the cross bar overlap. The guide groove is used to guide the end of the cross bar to slide into the overlapping interface. The treated sewage flows to the second intermediate tank downstream through the anaerobic outlet pipe.

[0012] In the above-mentioned multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system, a first window is provided through the side of the anaerobic tank, the first window is located above the cross bar and in the length direction of the cross bar, and a first switch door is rotatably connected in the first window, and the rotating shaft of the first switch door is horizontally arranged and located at the upper end.

[0013] A first window is provided on the upper part of the anaerobic tank, and the upper part of the first window is opened and closed by a first switch door. The first switch door is kept in a vertical state by the action of gravity, that is, the first window is closed, and can be conveniently rotated and opened when needed. The first window is mainly used for the disassembly and assembly of the cross bar and the biological rope, which is convenient for later maintenance and inspection. Moreover, the first window is located in the length direction of the cross bar, ensuring the extension and pulling out of the cross bar, so that each cross bar can be independently loaded, unloaded and maintained.

[0014] In the above-mentioned multi-stage high-efficiency denitrification and phosphorus removal rural domestic sewage treatment system, a second supporting mesh plate is provided in the aerobic tank, the outer side of the second supporting mesh plate is overlapped on the third boss on the inner wall of the aerobic tank, and the top of the second supporting mesh plate is filled with denitrification and phosphorus removal filler. The upper part of the aerobic tank is connected to the lower part of the second intermediate tank through an aerobic water inlet pipe, and the lower part of the aerobic tank is connected to the final discharge pipe.

[0015] The second supporting mesh plate is overlapped on the third boss and has flexible disassembly and assembly. It is used to carry the denitrification and dephosphorization filler, ensuring the replaceability of the filler. The filler achieves the corresponding denitrification and dephosphorization effects through nitrification reaction and polyphosphate effect under aerobic conditions. The aerobic water inlet pipe is used to input the sewage that has been anaerobically treated and temperature-controlled in the second intermediate tank, and the final discharge pipe is used to finally discharge the sewage after aerobic treatment.

[0016] In the above-mentioned multi-stage high-efficiency denitrification and phosphorus removal rural domestic sewage treatment system, a second window is provided through the side of the aerobic tank, the second window is located above the denitrification and phosphorus removal filler, and its length is adapted to the width of the second supporting mesh plate, and a second switch door is rotatably connected in the second window, and the rotating shaft of the second switch door is horizontally arranged and located at the upper end.

[0017] The second window is mainly used for disassembly, assembly and replacement of the second supporting mesh plate and denitrification and dephosphorization filler. The second opening and closing door and the first opening and closing door are similarly kept vertically closed by gravity and can be opened and closed conveniently.

[0018] In the above-mentioned multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system, the treatment tank body and the transition tank body are composed of a rectangular tank body separated by a first vertical partition, the treatment tank body is separated into a pretreatment tank, an anaerobic tank and an aerobic tank by two first transverse partitions, the transition tank body is separated into a first intermediate tank, a second intermediate tank and an equipment area by two second transverse partitions, and the pretreatment tank, anaerobic tank and aerobic tank are respectively divided into at least two by the second vertical partitions.

[0019] The transition tank body and the treatment tank body are separated from the rectangular tank body, that is, an integrated structure with high structural strength. The first transverse partition and the second transverse partition are spaced in sequence in the height direction to achieve the staggered between the treatment tank body and the transition tank body. The corresponding height difference provides the power for the sewage flow. The second vertical partition is used to separate multiple pretreatment tanks, anaerobic tanks or aerobic tanks. In general, the volume of the intermediate tank is larger than that of a single pretreatment tank, anaerobic tank or aerobic tank, ensuring the intermediate transition function of the transition tank body.

[0020] In the above-mentioned multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system, the upper port of the transition tank body is closed by a top plate, and a photovoltaic power generation component is provided on the top plate. The photovoltaic power generation component is connected to a power storage component, and the power storage component is arranged in the equipment area. At least one side of the equipment area is open to form an inspection port, and the power storage component supplies power to the temperature regulating device and the aeration device respectively.

[0021] A top plate is provided at the upper end of the transition tank body, on which a platform is formed. The photovoltaic power generation component is arranged on the platform, which improves the space utilization rate. The photovoltaic power generation component converts solar energy into electrical energy and stores it in the form of chemical energy in the power storage component. The power storage component is used to power the corresponding device, which is green and environmentally friendly, reduces operating costs, and has the ability to operate in the field. Of course, in order to ensure stable power supply, the power storage component can also be connected to the corresponding power supply line to ensure stable power supply to each device under various weather conditions. An open inspection port is provided on one side of the equipment area, through which the inspection and maintenance of each device can be conveniently achieved.

[0022] In the above-mentioned multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system, the connecting pipe passes through the first vertical partition and is arranged close to the inner wall of the rectangular pool body. The connecting pipe is provided with a water flow switch valve and a water intake detection port. The control end and water intake end of the water flow switch valve and the water intake detection port pass outward from the side wall of the rectangular pool body; the connecting pipe includes a pretreatment outlet pipe, an anaerobic inlet pipe, an anaerobic outlet pipe and an aerobic inlet pipe.

[0023] The connecting pipe passes through the first vertical partition to achieve the connection between the pools. Each connecting pipe is provided with a water switch valve and a water intake detection port to form a T-shaped structure, which is convenient for timely detection of various parameters of the sewage flowing therethrough to help determine whether the treatment effect of the corresponding treatment pool is qualified, and to close the water switch valve in time when it is confirmed that repair is required to ensure the overall treatment effect. In addition, the connecting pipe is arranged inside to reduce heat exchange with the external environment, ensure the stability of the sewage temperature, and reduce the power consumption of the temperature control component. The connecting pipes are also arranged close to the side wall of the rectangular pool body to facilitate the extension of the water switch valve and the water intake detection port.

[0024] As an optimization, the connecting pipe can also be a U-shaped pipe body, with both ends respectively connected to the sides of the treatment tank body and the transition tank body, and the water switch valve and the water intake detection port are also arranged on the pipe body. However, such a structure increases the volume in the horizontal direction to a certain extent, and the exposure of the connecting pipe increases the heat exchange with the external environment, which is not conducive to maintaining stable temperature.

[0025] In the above-mentioned multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system, the side walls of the pretreatment tank, the first intermediate tank, the anaerobic tank, the second intermediate tank and the aerobic tank are all provided with mud discharge pipes, the mud discharge pipes are arranged close to the bottom of the tank, and are all provided with mud discharge switch valves;

[0026] The mud discharge pipe is also connected to a reflux branch, and a water pump assembly is provided on the reflux branch for returning the sewage to the pretreatment tank when the treatment effect of the tank does not meet the standards.

[0027] The mud discharge pipe is mainly used to discharge the sludge deposited at the bottom of the corresponding pool body, and is switched on and off by a mud discharge switch valve, and is usually in a closed state. The reflux branch is connected to the mud discharge pipe, and can be used to return the sewage in the pool to the pretreatment pool for re-treatment when the treatment effect of the pool is unsatisfactory, so as to ensure the effect of sewage treatment. Of course, the reflux is reverse height transportation, which requires a water pump assembly to provide flow power.

[0028] Compared with the prior art, the present invention mainly has the following advantages:

[0029] 1. The transition tank body is set on the side, which can play a transition buffer role. Each treatment tank body is equipped with multiple tanks, which are respectively connected to the corresponding transition tank bodies, reducing the correlation between the treatment rates of the anaerobic tank and the aerobic tank, and between the pretreatment tank and the anaerobic tank, and improving the flexibility of inspection and maintenance.

[0030] 2. An equipment area is formed between the bottom and bottom surface of the second treatment tank, which is used to set up corresponding equipment, and has the function of sunshade and rainproof, thus extending the service life of the equipment. The temperature regulating device is used to control the temperature of the sewage in the first intermediate tank and the second intermediate tank to ensure the treatment efficiency of the downstream treatment unit, and the aeration device is used to aerate the aerobic tank to ensure the efficient aerobic reaction.

[0031] 3. The pretreatment tank, anaerobic tank and aerobic tank, as well as the first treatment tank and the second treatment tank are all distributed vertically, with compact structure and small footprint. An S-shaped treatment channel is formed between the pretreatment tank, the first intermediate tank, the anaerobic tank, the second intermediate tank and the aerobic tank, and circulation can be achieved through the height difference, thereby reducing operating costs.

[0032] 4. The transition tank body and the treatment tank body are separated from the rectangular tank body, that is, an integrated structure with high structural strength. A top plate is provided at the upper end of the transition tank body, and a platform is formed on the top plate. The photovoltaic power generation component is arranged on the platform, which improves space utilization. The photovoltaic power generation component converts solar energy into electrical energy and stores it in the form of chemical energy in the power storage component. The power storage component is used to power the corresponding device, which is green and environmentally friendly, reduces operating costs, and has the ability to operate in the field.

[0033] 5. The connecting pipe passes through the first vertical partition to achieve the connection between the pools. Each connecting pipe is provided with a water switch valve and a water intake detection port, which is convenient for timely detection of sewage therein to help judge the treatment effect of the corresponding treatment pool, and close the water switch valve in time when it is confirmed that repair is needed to ensure the overall treatment effect. In addition, the connecting pipe is arranged inside to reduce heat exchange with the external environment, ensure the stability of sewage temperature, and reduce the power consumption of temperature control components. Each connecting pipe is also arranged close to the side wall of the rectangular pool body, which is convenient for the extension of the water switch valve and the water intake detection port.

[0034] 6. The reflux branch is connected to the sludge discharge pipe, which can be used to return the sewage in the pool to the pretreatment pool for re-treatment when the treatment effect of the pool is unsatisfactory, so as to ensure the effect of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is an overall schematic diagram provided by the present invention;

[0036] Figure 2 yes Figure 1 Schematic diagram of the cross section at AA in the middle;

[0037] Figure 3 yes Figure 2 Enlarged detail of point B in the middle.

[0038] In the figure, a rectangular tank body 1, a sewage pipe 11, a treatment tank body 12, a transition tank body 13, a first vertical partition 14, a first horizontal partition 15, a second vertical partition 16, a second horizontal partition 17, a top plate 18, a photovoltaic power generation component 19,

[0039] Pretreatment tank 2, filter grid 21, filter filler layer 22, first boss 23, first support mesh plate 24, sand filter filler 25, second boss 26, sedimentation area 27, pretreatment outlet pipe 28,

[0040] Anaerobic tank 3, cross bar 31, lap platform 32, biological rope 33, anaerobic water inlet pipe 34, anaerobic water outlet pipe 35, lap joint 36, guide groove 37, first window 38, first switch door 39,

[0041] aerobic pool 4, second support mesh plate 41, denitrification and dephosphorization filler 42, third boss 43, aerobic water inlet pipe 44, final discharge pipe 45, second window 46, second switch door 47,

[0042] The first intermediate pool 5,

[0043] Second intermediate pool 6,

[0044] Equipment area 7, temperature regulating device 71, aeration device 72, inspection port 73, power storage component 74,

[0045] Connecting pipe 81, water flow switch valve 82, mud discharge pipe 83, mud discharge switch valve 84. DETAILED DESCRIPTION

[0046] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0047] Specific implementation examples Figure 1-3 As shown, the multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system includes a treatment tank body 12 and a transition tank body 13 located on the side of the treatment tank body 12. The treatment tank body 12 includes two groups of pretreatment tanks 2, anaerobic tanks 3 and aerobic tanks 4 arranged side by side and distributed from top to bottom. The transition tank body 13 includes a first intermediate tank 5 located between the pretreatment tank 2 and the anaerobic tank 3, and a second intermediate tank 6 located between the anaerobic tank 3 and the aerobic tank 4. The pretreatment tank 2, the first intermediate tank 5, the anaerobic tank 3, the second intermediate tank 6 and the aerobic tank 4 are connected in sequence through a connecting pipe 81. An equipment area 7 for installing a temperature regulating device 71 and an aeration device 72 is provided between the bottom surface of the anaerobic tank 3 and the aerobic tank 4. The temperature measuring head and the temperature control component (not specifically shown in the figure) of the temperature regulating device 71 are respectively inserted into the first intermediate tank 5 and the second intermediate tank 6, and the aeration pipe of the aeration device 72 is inserted into the bottom of the aerobic tank 4.

[0048] Specifically, the sewage treatment system of the present invention efficiently removes pollutants such as nitrogen and phosphorus in sewage through multi-stage treatment steps of pretreatment, anaerobic treatment and aerobic treatment. The treatment tank body 12 is used to perform specific purification treatment on sewage. The pretreatment tank 2 is filtered and precipitated to remove solid suspended matter in sewage to avoid affecting the treatment efficiency of subsequent treatment units; the anaerobic tank 3 performs anaerobic reaction through corresponding fillers to convert organic nitrogen into ammonia nitrogen and decompose organic matter, and the aerobic reaction performs nitrification reaction and phosphorus absorption through corresponding fillers to achieve the goal of further nitrogen and phosphorus removal. The transition tank body 13 is arranged on the side and can play a transition buffer role in the middle. Each tank of the treatment tank body 12 is provided with multiple tanks, which are respectively connected to the corresponding transition tank body 13, reducing the correlation between the treatment rates of the anaerobic tank 3 and the aerobic tank 4, and between the pretreatment tank 2 and the anaerobic tank 3, that is, temporarily disconnecting one of the pretreatment tanks 2, anaerobic tanks 3 or aerobic tanks 4 does not affect the smooth operation of the whole, and improves the flexibility of maintenance. Moreover, since the first intermediate tank 5 and the second intermediate tank 6 are staggeredly distributed between the pretreatment tank 2, the anaerobic tank 3 and the aerobic tank 4, the height difference therebetween provides power for the flow of sewage, and a certain space is formed between the bottom and the bottom surface of the second treatment tank. The space can be used as an equipment area 7 for arranging corresponding equipment, which has the function of shading from the sun and rain and prolonging the service life of the equipment. The equipment may include a temperature regulating device 71 and an aeration device 72. The temperature regulating device 71 is used to control the temperature of the sewage in the first intermediate tank 5 and the second intermediate tank 6 to ensure the treatment efficiency of the downstream treatment unit. The aeration device 72 is used to aerate the aerobic tank 4 to ensure the efficient aerobic reaction. Moreover, the pretreatment tank 2, the anaerobic tank 3 and the aerobic tank 4, as well as the first treatment tank and the second treatment tank are all distributed vertically, with a compact structure and a small footprint. An S-shaped treatment channel is formed between the pretreatment tank 2, the first intermediate tank 5, the anaerobic tank 3, the second intermediate tank 6 and the aerobic tank 4, and circulation can be achieved through the height difference. There is no need to set up a pump assembly separately, thereby reducing the operating cost. In addition, the equipment area 7 is located below the transition tank body 13, so that the temperature measuring head and the temperature control assembly of the temperature regulating device 71 can be inserted into the corresponding intermediate tank. The equipment area 7 is also located on the side of the lower part of the aerobic tank 4, so that the aeration pipe of the aeration device 72 can be inserted into the aerobic tank 4, thereby improving the rationality of the layout.

[0049] like Figure 1 , 2As shown, the upper end of the pretreatment tank 2 is open and connected to the bottom of the sewage pipe 11 respectively. A filter grille 21 and a filter filler layer 22 are distributed above and below the pretreatment tank 2. The outer side of the filter grille 21 is overlapped on the first boss 23 on the inner wall of the pretreatment tank 2. The filter filler layer 22 includes a first supporting mesh plate 24 and a sand filter filler 25 filled above the first supporting mesh plate 24. The outer side of the first supporting mesh plate 24 is overlapped on the second boss 26 on the inner wall of the pretreatment tank 2. A sedimentation area 27 is formed below the first supporting mesh plate 24, and the sedimentation area 27 is connected to the upper part of the first intermediate tank 5 through the pretreatment outlet pipe 28.

[0050] Specifically, the upper end of the pretreatment tank 2 is open, which is convenient for the disassembly and assembly of the filter grille 21 and the filter filler layer 22 as well as daily maintenance and inspection. The sewage pipe 11 is connected to the top of the pretreatment tank 2 for inputting the sewage to be treated. The filter grille 21 is used to intercept larger suspended matter, floating matter and other impurities in the sewage. It is placed on the first boss 23, is firmly installed and has flexible detachability. The first supporting mesh plate 24 is used to carry the sand filter filler 25. The sand filter filler 25 further removes suspended matter, colloids and other tiny particles in the sewage through its good filtering performance. The first supporting mesh plate 24 is overlapped on the second boss 26, which is easy to disassemble and ensure the replaceability of the sand filter filler 25. A sedimentation area 27 is formed between the first supporting mesh plate 24 and the bottom of the pretreatment tank 2. This area is used to collect and process the sludge and particulate matter settled after passing through the filter grille 21 and the filter filler layer 22. The pretreatment outlet pipe 28 is used to introduce the sewage after preliminary filtration and sedimentation treatment into the downstream first intermediate tank 5.

[0051] like Figure 1 , 2 As shown in Figure 3, a plurality of crossbars 31 are arranged side by side in the anaerobic tank 3, and the two ends of the crossbars 31 are overlapped on the overlap platform 32 on the inner wall of the anaerobic tank 3. A plurality of biological ropes 33 are hung on the crossbars 31, and the biological ropes 33 are inoculated with biofilms. The upper part of the anaerobic tank 3 is connected to the lower part of the first intermediate tank 5 through the anaerobic water inlet pipe 34, and the side wall of the lower part of the anaerobic tank 3 is connected to the upper part of the second intermediate tank 6 through the anaerobic water outlet pipe 35; the overlap platform 32 includes an arc-shaped overlap port 36, and a guide groove 37 with a larger upper part and a smaller lower part is provided on the side wall of the anaerobic tank 3 above the overlap port 36. A first window 38 is provided through the side of the anaerobic tank 3, and the first window 38 is located above the crossbar 31 and in the length direction of the crossbar 31. A first switch door 39 is rotatably connected in the first window 38, and the rotating shaft of the first switch door 39 is horizontally arranged and located at the upper end.

[0052] Specifically, both ends of the cross bar 31 are overlapped on the overlap platform 32, which is flexible for assembly and disassembly. The biological rope 33 is hung on the cross bar 31, providing a surface for microorganisms to attach and grow. The corresponding anaerobic bacteria and other microorganisms of the biofilm can achieve the corresponding ammonia nitrogen conversion and organic matter decomposition and phosphorus treatment effects under anaerobic conditions. The upper end surface of the overlap platform 32 is provided with an arc-shaped overlap interface 36 to ensure the stability of the overlap of the cross bar 31. The guide groove 37 is used to guide the end of the cross bar 31 to slide into the overlap interface 36. The treated sewage flows to the second intermediate tank 6 downstream through the anaerobic outlet pipe 35. A first window 38 is provided at the upper part of the anaerobic tank 3, and the upper part of the first window 38 is opened and closed by a first switch door 39. The first switch door 39 is kept in a vertical state by the action of gravity, that is, the first window 38 is closed, and can be easily rotated and opened when needed. The first window 38 is mainly used for the disassembly and assembly of the cross bar 31 and the biological rope 33, which is convenient for later maintenance and inspection. Moreover, the first window 38 is located in the length direction of the cross bar 31, ensuring the extension and pulling out of the cross bar 31, so that each cross bar 31 can be independently loaded, unloaded and maintained.

[0053] like Figure 1 , 2 As shown, a second supporting mesh plate 41 is provided in the aerobic pool 4, the outer side of the second supporting mesh plate 41 is overlapped on the third boss 43 on the inner side wall of the aerobic pool 4, a denitrification and dephosphorization filler 42 is filled above the second supporting mesh plate 41, the upper part of the aerobic pool 4 is connected to the lower part of the second intermediate pool 6 through the aerobic water inlet pipe 44, and the lower part of the aerobic pool 4 is connected to the final discharge pipe 45. A second window 46 is provided through the side of the aerobic pool 4, the second window 46 is located above the denitrification and dephosphorization filler 42, and its length is adapted to the width of the second supporting mesh plate 41, and a second switch door 47 is rotatably connected in the second window 46, and the rotating shaft of the second switch door 47 is horizontally arranged and located at the upper end.

[0054] Specifically, the second support mesh plate 41 is overlapped on the third boss 43, and has flexible disassembly and assembly. It is used to carry the denitrification and dephosphorization filler 42, ensuring the replaceability of the filler. The filler achieves the corresponding denitrification and dephosphorization effect through nitrification reaction and polyphosphate effect under aerobic conditions. The aerobic water inlet pipe 44 is used to input the sewage that has been anaerobically treated and temperature-controlled in the second intermediate tank 6, and the final discharge pipe 45 is used to finally discharge the sewage after aerobic treatment. The second window 46 is mainly used for the disassembly and replacement of the second support mesh plate 41 and the denitrification and dephosphorization filler 42. The second switch door 47 and the first switch door 39 are similarly kept vertically closed by gravity and can be opened and closed conveniently.

[0055] As an optimization of this embodiment, the treatment tank body 12 and the transition tank body 13 are formed by dividing the rectangular tank body 1 by the first vertical partition 14. The treatment tank body 12 is divided into the pretreatment tank 2, the anaerobic tank 3 and the aerobic tank 4 by two first transverse partitions 15. The transition tank body 13 is divided into the first intermediate tank 5, the second intermediate tank 6 and the equipment area 7 by two second transverse partitions 17. The pretreatment tank 2, the anaerobic tank 3 and the aerobic tank 4 are respectively divided into two by the second vertical partition 16. The upper port of the transition tank body 13 is closed by the top plate 18, and the top plate 18 is provided with a photovoltaic power generation component 19. The photovoltaic power generation component 19 is connected to a power storage component 74. The power storage component 74 is arranged in the equipment area 7. The outside of the equipment area 7 is open to form an inspection port 73. The power storage component 74 supplies power to the temperature regulating device 71 and the aeration device 72 respectively.

[0056] Specifically, the transition tank body 13 and the treatment tank body 12 are separated from the rectangular tank body 1, that is, they are an integrated structure with high structural strength. The first transverse baffle 15 and the second transverse baffle 17 are spaced in sequence in the height direction to achieve the staggered connection between the treatment tank body 12 and the transition tank body 13. The corresponding height difference provides the power for the flow of sewage. The second vertical baffle 16 is used to separate a plurality of pretreatment tanks 2, anaerobic tanks 3 or aerobic tanks 4. In general, the volume of the intermediate tank is larger than the volume of a single pretreatment tank 2, anaerobic tank 3 or aerobic tank 4, thereby ensuring the intermediate transition function of the transition tank body 13. A top plate 18 is provided at the upper end of the transition tank body 13, and a platform is formed on the top plate 18. The photovoltaic power generation component 19 is arranged on the platform, which improves the space utilization rate. The photovoltaic power generation component 19 converts solar energy into electrical energy and stores it in the form of chemical energy in the power storage component 74. The power storage component 74 is used to power the corresponding device, which is green and environmentally friendly, reduces operating costs, and has the ability to operate in the field. Of course, in order to ensure stable power supply, the power storage component 74 can also be connected to the corresponding power supply line to ensure stable power supply to each device under various weather conditions. An open inspection port 73 is provided on one side of the equipment area 7, through which the inspection and maintenance of each device can be conveniently achieved.

[0057] Further, such as Figure 2 As shown, the connecting pipe 81 passes through the first vertical partition 14 and is arranged close to the inner wall of the rectangular pool body 1. A water flow switch valve 82 and a water intake detection port are provided on the connecting pipe 81. The control end and water intake end of the water flow switch valve 82 and the water intake detection port extend outward from the side wall of the rectangular pool body 1; the connecting pipe 81 includes a pretreatment outlet pipe 28, an anaerobic inlet pipe 34, an anaerobic outlet pipe 35 and an aerobic inlet pipe 44.

[0058] Specifically, the connecting pipe 81 passes through the first vertical partition 14 to achieve connectivity between the pools, and each connecting pipe 81 is provided with a water flow switch valve 82 and a water intake detection port to form a T-shaped structure, which is convenient for timely detection of various parameters of the sewage flowing therethrough to help determine whether the treatment effect of the corresponding treatment pool is qualified, and to close the water flow switch valve 82 in time when it is confirmed that repair is required to ensure the overall treatment effect, and the connecting pipe 81 is arranged inside to reduce heat exchange with the external environment, ensure the stability of the sewage temperature, and reduce the power consumption of the temperature control component. Each connecting pipe 81 is also arranged close to the side wall of the rectangular pool body 1, which is convenient for the extension of the water flow switch valve 82 and the water intake detection port.

[0059] like Figure 1 As shown, the side walls of the pretreatment tank 2, the first intermediate tank 5, the anaerobic tank 3, the second intermediate tank 6 and the aerobic tank 4 are all provided with a sludge discharge pipe 83, which is arranged close to the bottom of the tank and is provided with a sludge discharge switch valve 84; the sludge discharge pipe 83 is also connected to a reflux branch (not specifically shown in the figure), and a water pump assembly is provided on the reflux branch for returning sewage to the pretreatment tank 2 when the treatment effect of the tank does not meet the standards.

[0060] Specifically, the mud discharge pipe 83 is mainly used to discharge the mud deposited at the bottom of the corresponding pool body, and is switched on and off by the mud discharge switch valve 84, and is usually in a closed state. The reflux branch is connected to the mud discharge pipe 83, and can be used to return the sewage in the pool to the pretreatment pool 2 for reprocessing when the treatment effect of the pool is unsatisfactory, so as to ensure the effect of sewage treatment. Of course, the reflux is reverse height transportation, which requires a water pump assembly to provide flow power.

[0061] Specific working principle: During treatment, sewage is output from the sewage pipe 11 and input into two pretreatment tanks 2 respectively. Sewage is filtered through the filter grid 21 and the filter filler layer 22 and flows into the sedimentation area 27 below. The supernatant is input into the first intermediate tank 5 from the pretreatment outlet pipe 28. The first intermediate tank 5 inputs sewage into the anaerobic tank 3 through the anaerobic inlet pipe 34, where denitrification reaction and organic matter degradation are carried out under the action of the biofilm. After a certain period of treatment, the water switch valve 82 on the anaerobic outlet pipe 35 is opened, and the anaerobic treated sewage is input into the second intermediate tank 6. The second intermediate tank 6 transports sewage to the aerobic tank 4 through the aerobic inlet pipe 44. After aerobic reaction of the denitrification and dephosphorization filler 42, it is discharged from the final discharge pipe 45. During this period, the temperature measuring head of the temperature adjustment device 71 detects the sewage temperature of the first intermediate tank 5 and the second intermediate tank 6 in real time, and adjusts the temperature through the temperature control component. The aeration device 72 continuously aerates and oxygenates the aerobic tank 4.

[0062] Periodically, the staff extracts the sewage samples that have been processed through the water intake test port and conducts tests. When the test results are found to be unsatisfactory, the water flow switch valve 82 and the upstream water inlet pipe are immediately closed, and the sewage in the pool is returned to the pretreatment pool 2 for reprocessing through the corresponding return water branch. After the sewage is drained, the staff replaces and maintains the fillers therein through the window.

[0063] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system, characterized in that: The invention comprises a treatment tank body (12) and a transition tank body (13) located on the side of the treatment tank body (12), wherein the treatment tank body (12) comprises at least two groups of pretreatment tanks (2), anaerobic tanks (3) and aerobic tanks (4) arranged side by side and distributed from top to bottom, and the transition tank body (13) comprises a first intermediate tank (5) located between the pretreatment tank (2) and the anaerobic tank (3), and a second intermediate tank (6) located between the anaerobic tank (3) and the aerobic tank (4), wherein the pretreatment tank (2), the first intermediate tank (5) and the aerobic tank (3) are arranged side by side and distributed from top to bottom. The intermediate tank (5), the anaerobic tank (3), the second intermediate tank (6) and the aerobic tank (4) are connected in sequence through a connecting pipe (81); an equipment area (7) for installing a temperature regulating device (71) and an aeration device (72) is provided between the bottom surface of the anaerobic tank (3) and the aerobic tank (4); the temperature measuring head and the temperature control component of the temperature regulating device (71) are respectively inserted into the first intermediate tank (5) and the second intermediate tank (6); and the aeration pipe of the aeration device (72) is inserted into the bottom of the aerobic tank (4).

2. The multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system according to claim 1 is characterized in that: The upper end of the pretreatment tank (2) is open and connected to the bottom of the sewage pipe (11). A filter grid (21) and a filter filler layer (22) are distributed above and below the pretreatment tank (2). The outer side of the filter grid (21) is overlapped on the first boss (23) on the inner wall of the pretreatment tank (2). The filter filler layer (22) includes a first support mesh plate (24) and a sand filter filler (25) filled above the first support mesh plate (24). The outer side of the first support mesh plate (24) is overlapped on the second boss (26) on the inner wall of the pretreatment tank (2). A sedimentation area (27) is formed below the first support mesh plate (24). The sedimentation area (27) is connected to the upper part of the first intermediate tank (5) through a pretreatment outlet pipe (28).

3. The multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system according to claim 1 is characterized in that: A plurality of cross bars (31) are arranged side by side in the anaerobic tank (3), and both ends of the cross bars (31) are overlapped on the overlap platform (32) on the inner wall of the anaerobic tank (3). A plurality of biological ropes (33) are hung on the cross bars (31), and the biological ropes (33) are inoculated with biofilms. The upper part of the anaerobic tank (3) is connected to the lower part of the first intermediate tank (5) through an anaerobic water inlet pipe (34), and the side wall of the lower part of the anaerobic tank (3) is connected to the upper part of the second intermediate tank (6) through an anaerobic water outlet pipe (35); The overlapping platform (32) comprises an arc-shaped overlapping interface (36), and a guide groove (37) with a larger upper part and a smaller lower part is provided on the side wall of the anaerobic tank (3) above the overlapping interface (36).

4. The multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system according to claim 3 is characterized in that: A first window (38) is provided through the side of the anaerobic tank (3), the first window (38) is located above the cross bar (31) and in the length direction of the cross bar (31), a first switch door (39) is rotatably connected in the first window (38), and the rotation axis of the first switch door (39) is horizontally arranged and located at the upper end.

5. The multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system according to claim 1 is characterized in that: The aerobic pool (4) is provided with a second supporting mesh plate (41), the outer side of the second supporting mesh plate (41) is overlapped on the third boss (43) on the inner wall of the aerobic pool (4), and the upper part of the second supporting mesh plate (41) is filled with a denitrification and dephosphorization filler (42). The upper part of the aerobic pool (4) is connected to the lower part of the second intermediate pool (6) through an aerobic water inlet pipe (44), and the lower part of the aerobic pool (4) is connected to a final discharge pipe (45).

6. The multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system according to claim 5 is characterized in that: A second window (46) is provided through the side of the aerobic pool (4), the second window (46) is located above the denitrification and dephosphorization filler (42), and its length is adapted to the width of the second supporting mesh plate (41), a second switch door (47) is rotatably connected in the second window (46), and the rotation axis of the second switch door (47) is horizontally arranged and located at the upper end.

7. The multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system according to claim 1 is characterized in that: The treatment tank body (12) and the transition tank body (13) are formed by dividing a rectangular tank body (1) by a first vertical partition (14); the treatment tank body (12) is divided into a pretreatment tank (2), an anaerobic tank (3) and an aerobic tank (4) by two first horizontal partitions (15); the transition tank body (13) is divided into a first intermediate tank (5), a second intermediate tank (6) and an equipment area (7) by two second horizontal partitions (17); and the pretreatment tank (2), the anaerobic tank (3) and the aerobic tank (4) are respectively divided into at least two by a second vertical partition (16).

8. The multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system according to claim 7 is characterized in that: The upper port of the transition tank body (13) is closed by a top plate (18), a photovoltaic power generation assembly (19) is provided on the top plate (18), the photovoltaic power generation assembly (19) is connected to a power storage assembly (74), the power storage assembly (74) is arranged in an equipment area (7), at least one side of the equipment area (7) is open to form an inspection port (73), and the power storage assembly (74) supplies power to a temperature regulating device (71) and an aeration device (72) respectively.

9. The multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system according to claim 7 is characterized in that: The connecting pipe (81) passes through the first vertical partition (14) and is arranged close to the inner wall of the rectangular pool body (1). The connecting pipe (81) is provided with a water-passing switch valve (82) and a water-intake detection port. The control end and the water-intake end of the water-passing switch valve (82) and the water-intake detection port pass outward from the side wall of the rectangular pool body (1). The connecting pipe (81) includes a pretreatment water outlet pipe (28), an anaerobic water inlet pipe (34), an anaerobic water outlet pipe (35) and an aerobic water inlet pipe (44).

10. The multi-stage high-efficiency nitrogen and phosphorus removal rural domestic sewage treatment system according to any one of claims 1 to 9, characterized in that: The side walls of the pretreatment tank (2), the first intermediate tank (5), the anaerobic tank (3), the second intermediate tank (6) and the aerobic tank (4) are all provided with mud discharge pipes (83), the mud discharge pipes (83) are arranged close to the bottom of the tank, and are all provided with mud discharge switch valves (84); The sludge discharge pipe (83) is also connected to a reflux branch, and a water pump assembly is provided on the reflux branch for returning the sewage to the pretreatment tank (2) when the treatment effect of the tank does not meet the standards.

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