A wastewater denitrification equipment that is easy to operate and maintain

Abstract

This invention relates to a wastewater denitrification device that is easy to operate and maintain, comprising a first filter tank, several filter media modules, and a water storage tank. The first filter tank has a first inlet at its bottom and a first outlet pipe at its top. Several filter media modules are laid flat to cover the bottom of the first filter tank and stacked upwards layer by layer. The outer walls of horizontally adjacent filter media modules are in close contact with each other, and the outer walls of the filter media modules are also in close contact with the inner wall of the first filter tank. The first outlet pipe is connected to the water storage tank. Each filter media module includes a filling box and filter media. The bottom and side walls of the filling box are provided with several water passage holes, and the filter media is located inside the filling box. This wastewater denitrification device, by setting up filter media modules, shares the weight of the filter media among different layers and horizontally adjacent filling boxes. This avoids a series of problems caused by filter media compression and damage, extending the operation and maintenance cycle. Furthermore, it increases the effective tank volume of the filter tank, offering advantages such as a long operation and maintenance cycle and strong denitrification capacity.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater denitrification device that is easy to operate and maintain. Background Technology

[0002] Heterotrophic denitrification is one of the core technologies in wastewater treatment. Its principle is that heterotrophic denitrifying bacteria (such as Pseudomonas and Thiobacillus denitrification) can rapidly reduce nitrate to nitrogen gas under anaerobic conditions, with a denitrification efficiency of up to 85%-95%. The traditional activated sludge process combined with heterotrophic denitrification processes (such as A2 / O and SBR) has been widely used. The technology is mature and the operation is stable, especially suitable for municipal sewage and industrial wastewater treatment.

[0003] Heterotrophic denitrification relies on organic carbon sources (such as methanol and sodium acetate), which has problems such as high operating costs (carbon sources account for 30%-50% of the total cost of wastewater treatment) and secondary pollution risks (such as COD rebound and sludge bulking). This has prompted researchers to explore denitrification pathways that do not require external carbon sources, thus giving rise to autotrophic denitrification.

[0004] Autotrophic denitrification is a biological nitrogen removal technology that does not rely on organic carbon sources. Its core lies in specific microorganisms using inorganic substances (such as sulfur, iron, and hydrogen) as electron donors to reduce nitrates to nitrogen gas. This process is achieved through the metabolic activities of specific microorganisms, which use CO2 or carbonates as carbon sources for their own growth, effectively reducing costs.

[0005] Traditional autotrophic denitrification filters typically employ concrete construction with filter media directly piled into the filter bed. This concrete construction results in a long construction period. The direct accumulation of filter media leads to several problems: firstly, it causes compression, structural damage, and clogging, resulting in uneven water flow, nitrogen retention, and accelerated scaling. This necessitates frequent backwashing (every 3-5 days) and nitrogen removal (every 2-3 days), and even manual maintenance. Secondly, it requires a thick layer of packing material (such as a pebble mat) at the bottom of the filter bed to support the filter media, reducing the effective tank volume, increasing the structural load, and expanding the overall construction size. Furthermore, the loading, cleaning, and replacement of filter media and packing material require large machinery, making it unsuitable for small water volumes (100-1000 m³). 3 / d) Processing requirements; it is evident that traditional autotrophic denitrification filters suffer from inconvenient operation and maintenance. Summary of the Invention

[0006] Based on this, the purpose of this invention is to provide a wastewater denitrification equipment that is easy to operate and maintain. By setting up filter media modules, the weight of the filter media is shared by different layers and horizontally adjacent filling boxes. On the one hand, this avoids the direct compression of a large amount of filter media, thus avoiding damage to the filter media structure caused by compression, and consequently avoiding problems such as uneven flow rate, nitrogen retention, and accelerated scaling of the filter media caused by filter media damage. This significantly extends the cycle of operation and maintenance work such as backwashing, nitrogen removal, removal of filter media for cleaning, and replacement of filter media. On the other hand, it eliminates the need to set additional packing material at the bottom of the filter tank to support the filter media, increasing the effective tank volume of the filter tank and enabling the equipment to cope with the treatment needs of small water volumes.

[0007] A wastewater denitrification device that is easy to operate and maintain includes a first filter tank, several filter media modules, and a water storage tank. The first filter tank has a first inlet at the bottom and a first outlet pipe at the top. Several filter media modules are laid flat to cover the bottom of the first filter tank and stacked upwards layer by layer. The outer walls of horizontally adjacent filter media modules are in close contact with each other, and the outer walls of the filter media modules are also in close contact with the inner wall of the first filter tank. The first outlet pipe is connected to the water storage tank. Each filter media module includes a filling box and filter media. The bottom and side walls of the filling box are provided with several water passage holes, and the filter media is located inside the filling box.

[0008] The wastewater denitrification equipment described in this invention, which is easy to operate and maintain, uses filter media modules. The weight of the filter media is shared by different layers and horizontally adjacent filling boxes. This avoids direct compression of a large amount of filter media, thus preventing damage to the filter media structure caused by compression. Consequently, it avoids problems such as uneven flow rate, nitrogen retention, and accelerated scaling of the filter media caused by filter media damage. This significantly extends the cycle of operation and maintenance work such as backwashing, nitrogen removal, filter media removal for cleaning, and filter media replacement. On the other hand, it eliminates the need to set additional packing material at the bottom of the filter tank to support the filter media, increasing the effective tank volume of the filter tank and enabling the equipment to cope with the treatment needs of small water volumes.

[0009] Furthermore, the filling box is equipped with an air-gathering space, which is formed by the top surface of the filter media located inside the filling box and the side wall of the filling box. Since there is no filter media obstruction within the air-gathering space, it can accelerate gas aggregation, extend the active nitrogen removal cycle, and allow for water re-distribution after passing through the filter media. This helps avoid flow interruptions caused by uneven water distribution, slows down the scaling rate of the filter media, and facilitates an extension of the operation and maintenance cycle.

[0010] Furthermore, the top of the side wall of the filling tank is provided with several venting notches, and the venting notches of horizontally adjacent filling tanks are interconnected. By setting venting notches, it is beneficial to balance the air pressure of each filter media module, ensure uniform nitrogen discharge, and thus ensure uniform water flow velocity, extending the cycle of operation and maintenance work such as active nitrogen removal and water washing.

[0011] Furthermore, it also includes a gas collection unit, which comprises at least one main pipe and several branch pipes fixed to the outer side of the main pipe and communicating with it. The main pipe has an open top end, which is higher than the liquid level of the first filter tank. The several branch pipes are respectively fixed to the outer wall of the first filter tank and communicating with the interior of the first filter tank. The positions of the several branch pipes on the outer wall of the first filter tank correspond to the positions of several exhaust gaps at different heights that are close to the inner wall of the first filter tank. By setting up the gas collection unit, since there are no obstructions in the main pipe and branch pipes, nitrogen in the filter media module tends to be discharged to the outside of the filter tank through the exhaust gaps, branch pipes, and main pipe, effectively improving the nitrogen exhaust efficiency, reducing the probability of nitrogen remaining in the filter media voids, reducing the impact of nitrogen on the filter media, and thus effectively extending the active nitrogen removal cycle and the working life of the filter media.

[0012] Furthermore, it also includes a second filter tank, a first inlet tee, a second inlet tee, a parallel inlet valve, a first outlet tee, a second outlet tee, a parallel outlet valve, and a series circulation pump; several of the filter media modules are also laid flat to cover the bottom of the second filter tank and stacked layer by layer upwards. The bottom of the second filter tank is provided with a second inlet, and the upper part of the second filter tank is provided with a second outlet pipe. One end of the first inlet tee is used to input sewage, and the remaining two ends of the first inlet tee are respectively connected to the first inlet and one end of the second inlet tee through pipelines. The parallel inlet valve is located at the connection point. The pipelines connecting the first inlet tee and the second inlet tee are connected, and the remaining two ends of the second inlet tee are respectively connected to the second inlet and the output end of the series circulation pump through pipelines. The first outlet pipe is connected to one end of the first outlet tee, and the remaining two ends of the first outlet tee are respectively connected to the second outlet tee and the input end of the series circulation pump through pipelines. The parallel outlet valve is located on the pipeline connecting the first outlet tee and the second outlet tee, and the remaining two ends of the second outlet tee are respectively connected to the second outlet pipe and the water storage tank.

[0013] The easy-to-operate and maintain wastewater denitrification equipment includes both series and parallel operation modes. In the series operation mode, the parallel effluent valve and the parallel influent valve are closed, and the series circulation pump is running. In the parallel operation mode, the parallel effluent valve and the parallel influent valve are open, and the series circulation pump stops running. The inclusion of filter tanks that can operate in series or parallel allows the equipment to have a stronger denitrification capacity within the same volume.

[0014] Furthermore, it also includes two pH probes, two level gauges, and a liquid alkali adding unit. The detection ends of the two pH probes are located below the liquid surface of the first and second filters, respectively. The two level gauges are fixed above the first and second filters, respectively. The output end of the liquid alkali adding unit faces the water storage tank. Based on the pH value and the level gauge readings, it can be determined whether liquid alkali needs to be added to the water storage tank, and then liquid alkali can be added to the water storage tank through the liquid alkali adding unit.

[0015] Furthermore, it also includes a water washing pump, two SS probes, and two pressure sensors. The input end of the water washing pump is connected to the water storage tank through a pipeline, and the output end of the water washing pump is connected to the end of the first inlet tee used for inputting sewage through a pipeline. The detection ends of the two SS probes are respectively located below the liquid surface of the first filter tank and the second filter tank. One pressure sensor is located on the pipeline connecting the first inlet and the first inlet tee, and the other pressure sensor is located on the pipeline connecting the second inlet and the second inlet tee.

[0016] Furthermore, it also includes a backwash fan, an air-washing tee, and a water-cooled pump. The bottom of the first filter tank is provided with a first air inlet, and the bottom of the second filter tank is provided with a second air inlet. The output end of the backwash fan is connected to the air-washing tee through a pipeline. The remaining two ends of the air-washing tee are connected to the first air inlet and the second air inlet through pipelines, respectively. The input end of the water-cooled pump is connected to the water storage tank. The output end of the water-cooled pump is connected to the water-cooled inlet of the backwash fan through a pipeline. The water-cooled outlet of the backwash fan is connected to the water storage tank through a pipeline.

[0017] Furthermore, it also includes two overflow weirs, a first water collection pool, and a second water collection pool. The first water collection pool is fixed inside the first filter pool and located above the filter media module. The second water collection pool is fixed inside the second filter pool and located above the filter media module. The two overflow weirs are respectively set on the side wall of the first water collection pool where liquid overflows from the first filter pool and the side wall of the second water collection pool where liquid overflows from the second filter pool. The outlet of the first water collection pool is connected to one end of the first outlet tee via a pipe, and the outlet of the second water collection pool is connected to one end of the second outlet tee via a pipe.

[0018] Furthermore, it also includes a computing control unit, which is electrically connected to the parallel inlet valve, the parallel outlet valve, and the series circulation pump. The computing control unit controls the opening and closing of the parallel inlet valve and the parallel outlet valve, and controls the start and stop of the series circulation pump. The inclusion of a computing control unit reduces the manpower required for operation and maintenance.

[0019] The beneficial effects of this application are as follows:

[0020] 1. By setting up filter media modules, the weight of the filter media is shared by different layers and horizontally adjacent filling boxes. This avoids direct compression of a large amount of filter media, preventing damage to the filter media structure caused by compression, and thus avoiding problems such as uneven flow rate, nitrogen retention, and accelerated scaling caused by filter media damage. This significantly extends the cycle of maintenance work such as backwashing, nitrogen removal, filter media removal for cleaning, and filter media replacement. On the other hand, there is no need to set additional packing at the bottom of the filter tank to support the filter media, increasing the effective tank volume of the filter tank and enabling the equipment to cope with the treatment needs of small water volumes.

[0021] 2. An air-gathering space is set between the filter media and the top surface of the filling box. Since there is no filter media blocking the air-gathering space, it can accelerate the gathering of gas and extend the cycle of active nitrogen removal. On the other hand, it can realize the re-distribution of water after passing through the filter media, which helps to avoid the interruption of flow caused by uneven water distribution, slows down the scaling of the filter media, and helps to extend the operation and maintenance cycle.

[0022] 3. By setting up venting openings, it is beneficial to balance the air pressure of each filter media module, ensure uniform nitrogen discharge, and thus ensure uniform water flow velocity, extending the cycle of operation and maintenance work such as active nitrogen removal and water washing.

[0023] 4. The gas collection unit is set up. Since there are no obstructions in the main pipe and branch pipe, the nitrogen in the filter media module tends to be discharged to the outside of the filter tank through the exhaust port, branch pipe and main pipe. This effectively improves the nitrogen exhaust efficiency, reduces the probability of nitrogen remaining in the filter media voids, reduces the impact of nitrogen on the filter media, and thus effectively extends the active nitrogen removal cycle and extends the working life of the filter media.

[0024] 5. Based on the pH value and level gauge readings, it can be determined whether liquid alkali needs to be added to the water storage tank, and liquid alkali can be added to the water storage tank through the liquid alkali adding unit.

[0025] 6. It can be determined whether water washing is needed based on changes in inlet water pressure or SS value of effluent. Water from the storage tank can be used for water washing via a water washing pump, and the wastewater after water washing can be incorporated into the wastewater to be denitrified.

[0026] 7. Set up a computing control unit to reduce the manpower required for operation and maintenance.

[0027] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a wastewater denitrification equipment that is easy to operate and maintain, as described in one embodiment.

[0029] Figure 2 This is a schematic diagram of the structure of a wastewater denitrification equipment for easy operation and maintenance, with the filter media module and gas collection unit concealed in one embodiment.

[0030] Figure 3 This is a schematic diagram of the filter media module structure and the location of the exhaust notch as described in one embodiment;

[0031] Figure 4 This is an enlarged schematic diagram of the venting notch of the filter module described in one embodiment;

[0032] The system includes: a first filter tank 1, a first water washing outlet 101, a second filter tank 2, a second water washing outlet 201, a T-shaped filter brick 3, a filter media module 4, a filling box 401, filter media 402, a handle 403, a water passage hole 404, an exhaust vent 405, an air collection unit 5, a first main pipe 501, a second main pipe 502, a branch pipe 503, a first inlet tee 6, a second inlet tee 7, a parallel inlet valve 8, a first water collection tank 9, a second water collection tank 10, an overflow weir 11, a first outlet tee 12, a second outlet tee 13, a series circulation pump 14, a parallel outlet valve 15, an equipment room 16, a water storage tank 17, an overflow outlet 1701, a water washing pump 18, a backwash fan 19, a water-cooled pump 20, an air washing tee 21, a first air inlet valve 22, a second air inlet valve 23, a pH probe 24, a level gauge 25, an SS probe 26, and a calculation and control unit 27. Detailed Implementation

[0033] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0034] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0035] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0037] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the embodiments of this application is limited only by the appended claims.

[0038] This invention provides a wastewater denitrification device that is easy to operate and maintain. Please refer to [link / reference]. Figures 1-4 The system includes: a first filter (1), a second filter (2), several T-shaped filter bricks (3), several filter media modules (4), an air collection unit (5), a field regulating tank, a first inlet tee (6), a second inlet tee (7), parallel inlet valves (8), a first water collection tank (9), a second water collection tank (10), two overflow weirs (11), a first outlet tee (12), a second outlet tee (13), a series circulation pump (14), parallel outlet valves (15), an equipment room (16), a water storage tank (17), a water washing pump (18), a backwash fan (19), a water-cooled pump (20), an air washing tee (21), a first air inlet valve (16), a second air inlet valve (23), two pH probes (24), two level gauges (25), a liquid alkali adding unit (26), two SS probes (27), two pressure sensors, and a calculation and control system. Unit 27; In this embodiment, the first filter pool 1, the second filter pool 2, the water storage tank 17, the equipment room 16, the first water collection tank 9, and the second water collection tank 10 are all made of steel structure and have open tops. The first filter pool 1, the second filter pool 2, the water storage tank 17, and the equipment room 16 are arranged in sequence, such that the first filter pool 1 and the second filter pool 2 are separated by a common side wall, the second filter pool 2 and the water storage tank 17 are separated by a common side wall, and the equipment room 16 and the water storage tank 17 are separated by a common side wall; In other embodiments, the first filter pool 1, the second filter pool 2, the water storage tank 17, and the equipment room 16 can also be set as four independent parts as needed;

[0039] In this embodiment, the cross-section of the inner wall of the first filter tank 1 and the inner wall of the second filter tank 2 are both rectangular with a cross-section of 1000mm*2000mm and are both surrounded by four side walls. The bottom of the first filter tank 1 is provided with a first water inlet and a first air inlet. A first water washing outlet 101 is provided on one side wall of the first filter tank 1. The first water washing outlet 101 is located above the filter media module 4. The first water washing outlet 101 is connected to a first water washing valve through a pipeline. The other end of the first water washing valve is connected to the field regulating tank through a pipeline. The first water washing valve is only opened when the first filter tank 1 is washed. The bottom of the second filter tank 2 is provided with a second water inlet and a second air inlet. A second water washing outlet 201 is provided on one side wall of the second filter tank 2. The second water washing outlet 201 is located above the filter media module 4. The second water washing outlet 201 is connected to a second water washing valve through a pipeline. The other end of the second water washing valve is connected to the field regulating tank through a pipeline. The second water washing valve is only opened when the second filter tank 2 is washed.

[0040] Several T-shaped filter bricks 3 are located in the first filter tank 1 and the second filter tank 2. Several T-shaped filter bricks 3 are laid and covered at the bottom of the first filter tank 1 and the bottom of the second filter tank 2 respectively. Several T-shaped filter bricks 3 and the bottom of the first filter tank 1 and the bottom of the second filter tank 2 respectively form a space for laying water inlet pipe and air inlet pipe.

[0041] Several filter media modules 4 are located in the first filter tank 1 and the second filter tank 2, respectively. In this embodiment, the filter media modules 4 in the first filter tank 1 and the second filter tank 2 are stacked in 8 layers, with 4 filter media modules 4 laid in each layer. In other embodiments, the number of layers of filter media modules 4 and the number of filter media modules 4 laid in each layer can be adjusted according to actual conditions. The outer walls of horizontally adjacent filter media modules 4 in each filter tank are in close contact with each other. The outer wall of the filter media modules 4 in the first filter tank 1 is also in close contact with the inner wall of the first filter tank 1, so that the filter media modules 4 are laid flat to cover the bottom of the first filter tank 1 and stacked layer by layer upwards. The outer wall of the filter media modules 4 in the second filter tank 2 is also in close contact with the inner wall of the second filter tank 2, so that the filter media modules 4 are laid flat to cover the bottom of the second filter tank 2 and stacked layer by layer upwards, so as to ensure that the filter media modules 4 are laid flat to cover the bottom of the second filter tank 2 and stacked layer by layer upwards, ensuring that the filter media modules 4 are laid flat to cover the bottom of the first filter tank 1 and the second filter tank 2. The incoming water passes through the filter media module 4. In this embodiment, the filter media module 4 includes a filling box 401, filter media 402, and a handle 403. In this embodiment, the filling box 401 is made of 304 stainless steel plate with a thickness of 3mm. The filling box 401 consists of a 1000mm*500mm base plate and four side walls fixed to the outer perimeter of the base plate with a height of 400mm. The bottom and four side walls of the filling box 401 are provided with several water passage holes 404. The water passage holes 404 are elongated and 4mm wide. The top of the side walls of the filling box 401 is provided with several venting notches 405. The 500mm wide side wall has one venting notch 405 in the middle of its upper end face, and the 1000mm wide side wall has two venting notches 405 in its upper end face. The location of the venting notches 405 can be found in [reference needed]. Figure 3 The circled area shows that the cross-section of exhaust notch 405 is semi-circular, which can be referenced. Figure 4The semicircle has a diameter of 20mm. The venting gaps 405 of adjacent filling boxes 401 on the same layer are interconnected. The venting gaps 405 help balance the air pressure of each filter media module 4 and ensure uniform nitrogen discharge, which in turn helps ensure uniform water flow velocity and extends the cycle of active nitrogen removal, water washing and other maintenance work. In this embodiment, the filter media 402 is located inside the filling box 401. The top surface of the filter media inside the filling box 401 and the side wall of the filling box 401 together form the air-gathering space of the filling box 401. In this embodiment, the distance between the top surface of the filter media 402 inside the filling box 401 and the top surface of the side wall of the filling box 401 is 2-3cm. Since there is no filter media 402 in the air-gathering space... The obstruction can, on the one hand, accelerate the gas convergence and extend the active nitrogen removal cycle, and on the other hand, enable the water flow to be re-distributed after passing through the filter media 402, which helps to avoid flow interruption caused by uneven water distribution, slows down the scaling speed of the filter media 402, and helps to extend the operation and maintenance cycle. The handle 403 in this embodiment is made of 304 stainless steel and has an inverted T-shaped cross section. The handle 403 is located inside the filling box 401 and is set near the top of the filling box 401. The two ends of the handle 403 are fixed to the inner wall of the filling box 401. The handle 403 facilitates the removal of the filter media module 4 during operation and maintenance, improving the efficiency of operation and maintenance work such as replacing the filter media 402 and manually cleaning the filter media 402.

[0042] The gas collection unit 5 in this embodiment includes two main pipes (first main pipe 501 and second main pipe 502) and fourteen branch pipes 503. The diameter of the main pipe is 80 mm, and the diameter of the branch pipes 503 is 32 mm. Seven branch pipes 503 connected to the main pipe are fixed to the outer side of each main pipe 501. The main pipe includes an open top. In this embodiment, the bottom end of the first main pipe 501 is connected to the first filter tank 1, and the top end of the first main pipe 501 is higher than the liquid level of the first filter tank 1. The bottom end of the second main pipe 502 is connected to the second filter tank 2, and the top end of the second main pipe 502 is higher than the liquid level of the second filter tank 2. The seven branch pipes 503 connected to the first main pipe 501 are connected to the interior of the first filter tank 1 and... The positions of the seven exhaust vents 405 at different heights close to the inner wall of the first filter tank 1 correspond to the positions of the seven branch pipes 503 connected to the second main pipe 502 and the interior of the second filter tank 2, which correspond to the positions of the seven exhaust vents 405 at different heights close to the inner wall of the second filter tank 2. Since there are no obstructions in the main pipe 501 and the branch pipes 503, the nitrogen in the filter media module 4 tends to be discharged to the outside of the filter tank through the exhaust vents 405, the branch pipes 503 and the main pipe 501. This can effectively improve the nitrogen exhaust efficiency, reduce the probability of nitrogen remaining in the gaps of the filter media 402, reduce the impact of nitrogen on the filter media 402, and thus effectively extend the active nitrogen removal cycle and extend the working life of the filter media 402.

[0043] The on-site equalization tank is used to hold the wastewater to be denitrified and the wastewater discharged from the first water washing outlet 101 and the second water washing outlet 201. The output end of the on-site equalization tank is connected to one end of the first inlet tee 6 through a pipeline. The remaining two ends of the first inlet tee 6 are respectively connected to the first inlet and one end of the second inlet tee 7 located at the bottom of the first filter tank 1 through pipelines. The remaining two ends of the second inlet tee 7 are respectively connected to the second inlet located at the bottom of the second filter tank 2 and the output end of the series circulation pump 14 through pipelines. The parallel inlet valve 8 is located on the pipeline connecting the first inlet tee 6 and the second inlet tee 7.

[0044] The first water collection tank 9 is located inside the first filter tank 1 and above the first water washing outlet 101. The first water collection tank 9 is fixed to the inner wall of the first filter tank 1. When the liquid level in the first filter tank is higher than that in the first water collection tank 9, the liquid will overflow into the first water collection tank 9. The second water collection tank 10 is located inside the second filter tank 2 and above the second water washing outlet 201. The second water collection tank 10 is fixed to the inner wall of the second filter tank 2. When the liquid level in the second filter tank 2 is higher than that in the second water collection tank 10, the liquid will overflow into the second water collection tank 10. Weirs 11 are located within the first filter tank 1 and the second filter tank 2, respectively, and are fixed to the side walls of the first collection tank 9 and the second collection tank 10 where overflow occurs. The outlet of the first collection tank 9 is connected to the first outlet tee 12 via a first outlet pipe. The remaining two ends of the first outlet tee 12 are connected to the second outlet tee 13 and the input end of the series circulation pump 14, respectively. A parallel outlet valve 15 is located on the pipe connecting the first outlet tee 12 and the second outlet tee 13. The outlet of the second collection tank 10 is connected to... The second outlet pipe is connected to one end of the second outlet tee 12, and the remaining end of the second outlet tee 13 is connected to the pipe leading to the water storage tank 17. In this embodiment, the water outlets of the first water collection tank 9 and the second water collection tank 10 share the same flow path to the water storage tank 17. The water outlet of the first water collection tank 9 flows to the water storage tank 17 sequentially through the first outlet pipe, the first outlet tee 12, and the second outlet tee 13. The water outlet of the second water collection tank 10 flows to the water storage tank after passing through the second outlet pipe and the second outlet tee 13. 17. Therefore, in this embodiment, the parallel outlet valve 15 is located on the pipeline connecting the first outlet tee 12 and the second outlet tee 13. In other embodiments, if the water from the first collection tank 9 flows directly to the storage tank 17 through a separate pipeline after passing through the first outlet tee 12, and the water from the second collection tank 10 flows directly to the storage tank 17 through a separate pipeline, then there is no need to set up the second outlet tee 13, and the parallel outlet valve 15 will be set on the pipeline connecting the first outlet tee 12 and the storage tank 17.

[0045] The water storage tank 17 is used to hold water that meets the total nitrogen standard after denitrification treatment. The side wall of the water storage tank 17 is provided with an overflow port 1701. After the liquid level in the water storage tank 17 reaches the height of the overflow port 1701, it overflows from the overflow port 1701 to the outside of the sewage denitrification equipment.

[0046] Equipment room 16 is divided into upper and lower levels by a perforated partition. The series circulation pump 14 and water washing pump 18 are both fixed in the upper level of equipment room 16. The input end of water washing pump 18 is connected to water storage tank 17 via a pipeline, and the output end of water washing pump 18 is connected to the pipeline between the on-site regulating tank and the first inlet tee 6 via a pipeline. Backwash blower 19 and water-cooled pump 20 are both fixed in the lower level of equipment room 16. In this embodiment, backwash blower 19 is a Roots blower. The input end of backwash blower 19 is located inside equipment room 16, and the output end of backwash blower 19 is connected to one end of air washing tee 21 via a pipeline. The remaining two ends of the air-washing tee 21 are connected to the first air inlet at the bottom of the first filter tank 1 and the second air inlet at the bottom of the second filter tank 2 respectively through pipelines. A first air inlet valve 16 is provided between the air-washing tee 21 and the first air inlet, and a second air inlet valve 23 is provided between the air-washing tee 21 and the second air inlet. A water-cooled pump 20 is used to cool the backwash fan 19. The input end of the water-cooled pump 20 is connected to the water storage tank 17 through a pipeline, and the output end of the water-cooled pump 20 is connected to the water-cooled inlet of the backwash fan 19 through a pipeline. The water-cooled outlet of the backwash fan 19 is connected to the water storage tank 17 through a pipeline.

[0047] Two pH probes 24 are fixed above the first filter 1 and the second filter 2 respectively. The detection ends of the two pH probes 24 are located below the liquid surface of the first filter 1 and the second filter 2 respectively. The two pH probes 24 are used to detect the pH value of the first filter 1 and the second filter 2 in real time.

[0048] Two level gauges 25 are fixed above the first filter tank 1 and the second filter tank 2 respectively. The two level gauges 25 are set facing the liquid surface of the first filter tank 1 and the liquid surface of the second filter tank 2 respectively. The two level gauges 25 are used to detect the liquid level of the first filter tank 1 and the second filter tank 2 in real time.

[0049] The liquid alkali adding unit is fixed above the water storage tank 17, and the output end of the liquid alkali adding unit is set towards the water storage tank 17. The liquid alkali adding unit is used to add liquid alkali to the water storage tank 17.

[0050] Two SS probes 26 are fixed above the first filter 1 and the second filter 2 respectively. The detection ends of the two SS probes 26 are located below the liquid surface of the first filter 1 and the second filter 2 respectively. The two SS probes 26 are used to detect the SS value (solid content) of the first filter 1 and the second filter 2 in real time.

[0051] One pressure sensor is located on the pipe connecting the first inlet tee 6 to the bottom of the first filter tank 1, and is used to detect the water pressure of the pipe connecting the first inlet tee 6 to the bottom of the first filter tank 1. Another pressure sensor is located on the pipe connecting the second inlet tee 7 to the bottom of the second filter tank 2, and is used to detect the inlet water pressure of the pipe connecting the second inlet tee 7 to the bottom of the second filter tank 2.

[0052] The calculation and control unit 27 is fixed on the upper level of the equipment room 16. The calculation and control unit 27 is electrically connected to the parallel inlet valve 8, the series circulating pump 14, the parallel outlet valve 15, the first water washing valve, the second water washing valve, the water washing pump 18, the backwash fan 19, the water cooling pump 20, the first air inlet valve 16, the second air inlet valve 23, the pH probe 24, the level gauge 25, the liquid alkali adding unit, the SS probe 26, and the pressure sensor. This allows on-site personnel to directly control the opening and closing of each valve, the start and stop of each pump, fan, and liquid alkali adding unit, and their operating power, as well as acquire and process the detection data from each probe, level gauge 25, and sensor via the calculation and control unit 27. The calculation and control unit 27 can obtain real-time data detected by the level gauge 25 and processed by the calculation and control unit. It can also determine whether liquid alkali needs to be added based on real-time data detected by the pH probe 24 and processed by the calculation and control unit, and control the operation of the liquid alkali adding unit to add liquid alkali to the water storage tank 17. Furthermore, it can determine whether water washing is needed based on real-time data detected by the SS probe 26 and the pressure sensor and processed by the calculation and control unit, and control the water washing and air washing processes through the calculation and control unit 27. The setting of the calculation and control unit 27 reduces the manpower input for the operation and maintenance of the wastewater denitrification equipment and makes the operation more convenient.

[0053] The common states of a wastewater denitrification device that is easy to operate and maintain according to an embodiment of the present invention include initial state, series operation state, parallel operation state, water washing state, and air washing state.

[0054] In the initial state, the output end of the on-site equalization tank stops outputting wastewater to be denitrified. In this embodiment of the invention, the on-site equalization tank outputs wastewater to be denitrified by pumping. The first water washing valve, the second water washing valve, the first air inlet valve 16 and the second air inlet valve 23 are all closed, and the series circulation pump 14, the water washing pump 18, the backwash fan 19, the water cooling pump 20 and the liquid alkali addition unit all stop operating.

[0055] In series operation, the output of the on-site equalization tank continuously outputs wastewater to be denitrified. Parallel inlet valve 8, parallel outlet valve 15, first wash valve, second wash valve, first air inlet valve 16, and second air inlet valve 23 are all closed. Wash pump 18, backwash fan 19, water-cooled pump 20, and liquid alkali dosing unit all stop operating, while series circulation pump 14 starts. At this time, the wastewater with denitrification output from the on-site equalization tank passes through the inlet tee. Because the wastewater flowing towards the second inlet is intercepted by the series inlet valve, the wastewater with denitrification output from the on-site equalization tank can only flow towards the first inlet and reach the bottom of the first filter tank 1. It then passes sequentially through the T-shaped filter bricks 3 at the bottom of the first filter tank 1 and the 8-layer filter media module 4 located within the first filter tank 1. Finally, it overflows through the overflow weir 11 into the first collection tank 9. Once the liquid level in the first collection tank 9 reaches a certain height, the wastewater then flows out of the outlet of the first collection tank 9. The water flows to the first outlet tee 12. Because the water flowing to the storage tank 17 is blocked by the parallel outlet valve 15, the water flowing out of the outlet of the first collection tank 9 can only flow to the series circulation pump 14 and be pumped by the series circulation pump 14 to the second inlet. Then it passes through the T-shaped filter brick 3 at the bottom of the second filter tank 2 and the 8-layer filter media module 4 located in the second filter tank 2 in sequence. Then it overflows into the second collection tank 10 by the overflow weir 11. After the liquid level in the second collection tank 10 reaches a certain height, it flows from the outlet of the second collection tank 10 to the storage tank 17 for storage.

[0056] In parallel operation, the output of the on-site equalization tank continuously outputs wastewater to be denitrified. The first water washing valve, the second water washing valve, the first air inlet valve 16, and the second air inlet valve 23 are all closed, while the parallel inlet valve 8 and the parallel outlet valve 15 are open. The series circulation pump 14, the water washing pump 18, the backwash fan 19, the water cooling pump 20, and the liquid alkali dosing unit all stop operating. At this time, the wastewater with denitrification output from the on-site equalization tank flows to the first inlet and the second inlet after passing through the inlet tee. Then, after being filtered by the first filter tank 1 and the second filter tank 2, it overflows from the overflow weir 11 into the first collection tank 9 and the second collection tank 10. After the liquid levels in the first collection tank 9 and the second collection tank 10 reach a certain height, the water flows from the outlets of the first collection tank 9 and the second collection tank 10 into the storage tank 17 for storage.

[0057] When entering the water washing state under series operation, the output of the output end of the field regulating tank needs to be stopped, the water washing pump 18 is run and the first water washing valve is opened. At this time, the water washing pump 18 will pump the water in the water storage tank 17 to the first water inlet to wash the inside of the first filter tank 1. The washed water will flow out from the first water washing outlet 101 and flow to the field regulating tank.

[0058] When entering the water washing state under parallel operation, the output of the on-site regulating tank needs to be stopped, the water washing pump 18 is started and the first water washing valve and the second water washing valve are opened. At this time, the water washing pump 18 will pump the water in the water storage tank 17 to the first water inlet and the second water inlet, thereby rinsing the interior of the first filter tank 1 and the interior of the second filter tank 2. The water after rinsing the first filter tank 1 will flow out from the first water washing outlet 101 and flow to the on-site regulating tank. The water after rinsing the second filter tank 2 will flow out from the second water washing outlet 201 and flow to the on-site regulating tank. It should be noted that when using the water in the water storage tank 17 for water washing, the liquid level in the water storage tank 17 should be ensured to be no less than 20cm. If the water in the water storage tank 17 is insufficient, the water washing can be carried out by using an external water source to supply water to the water storage tank 17, or by directly using an external water source for water washing.

[0059] The air washing state is entered by running the backwash fan 19 and the water-cooled pump 20, and opening the first air inlet valve 16 and the second air inlet valve 23. At this time, the backwash fan 19 will continuously deliver gas to the first air inlet and the second air inlet for backwashing, and the water-cooled pump 20 will use the water in the water storage tank 17 to cool the backwash unit. In other embodiments or in this embodiment, when necessary, the water-cooled pump 20 can also use tap water to cool the backwash fan 19.

[0060] This invention provides a wastewater denitrification device that is easy to operate and maintain. By incorporating a filter media module 4, a filling box 401 distributes and supports the filter media 402, thus avoiding direct compression of a large amount of filter media 402. This prevents damage to the filter media 402 structure caused by compression, and consequently avoids problems such as uneven flow rate, nitrogen retention, and accelerated scaling of the filter media 402 due to filter media damage. This significantly extends the cycle of maintenance tasks such as backwashing, nitrogen removal, cleaning, and replacement of the filter media 402. Furthermore, it eliminates the need for additional packing material at the bottom of the filter tank to support the filter media 402, increasing efficiency. The addition of the filter bed increases the effective tank volume, enabling the equipment to handle small water volume treatment needs. Combined with the advantage of being able to be used in series, the equipment has a stronger denitrification capacity within the same size. Furthermore, due to the obstruction of the filling tank 401401, the filter media 402 inside the filling tank 401401 is not easily broken by direct impact during water washing and air washing. Specifically, in actual use, the water washing cycle can reach once every 15 to 20 days, and air washing is basically unnecessary. In addition, it has the advantages of quick mold installation and rapid start-up, reaching a high removal load in only 1 to 3 days, while traditional autotrophic denitrification filters require at least 10 days.

[0061] To further simplify operation and maintenance, in one embodiment, the wastewater denitrification equipment, which is easy to operate and maintain, can also be partially automatically controlled by the computing control unit 27:

[0062] When the computer receives a command to enter the water washing state, when the sensor detects that the pressure has increased by 0.3 meters of water column relative to the initial pressure, and when the effluent SS value is higher than 5, the computer control unit 27 controls the wastewater denitrification equipment to enter the water washing state. After the preset water washing time is reached or a command to exit the water washing state is received, the computer control unit 27 controls the wastewater denitrification equipment to exit the water washing state.

[0063] When a command to add liquid alkali is received or pH < 7.5, the calculation control unit 27 controls the liquid alkali adding unit to add liquid alkali to the water storage tank 17. When pH = 8.5 or a command to stop adding liquid alkali is received, the calculation control unit 27 controls the liquid alkali adding unit to stop adding liquid alkali.

[0064] When a command to enter the air washing state is received, the computing control unit 27 controls the backwash fan 19 and the water-cooled pump 20 to run, and controls the first air inlet valve 16 and the second air inlet valve 23 to open, so that the wastewater denitrification equipment enters the air washing state. When a command to exit the air washing state is received or the preset air washing time is reached, the computing control unit 27 controls the backwash fan 19 and the water-cooled pump 20 to stop running, and controls the first air inlet valve 16 and the second air inlet valve 23 to close, so that the wastewater denitrification equipment exits the air washing state.

[0065] After ensuring that the output end of the on-site equalization tank continuously outputs wastewater to be denitrified, when the instruction to enter the series operation state is received, the calculation control unit 27 controls the parallel inlet valve 8, parallel outlet valve 15, first water washing valve, second water washing valve, first air inlet valve 16 and second air inlet valve 23 to close, controls the water washing pump 18, backwash fan 19, water cooling pump 20 and liquid alkali addition unit to stop running, and controls the series circulation pump 14 to start, so that the wastewater denitrification equipment enters the series operation state;

[0066] After ensuring that the output end of the on-site equalization tank continuously outputs wastewater to be denitrified, when the instruction to enter the parallel operation state is received, the calculation control unit 27 controls the first water washing valve, the second water washing valve, the first air inlet valve 16 and the second air inlet valve 23 to close, controls the parallel water inlet valve 8 and the parallel water outlet valve 15 to open, and controls the series circulation pump 14, water washing pump 18, backwash fan 19, water cooling pump 20 and liquid alkali addition unit to stop operating, so that the wastewater denitrification equipment enters the parallel operation state;

[0067] After ensuring that the output of the on-site equalization tank stops outputting wastewater to be denitrified, when a reset command is received, the calculation control unit 27 controls the first water washing valve, the second water washing valve, the first air inlet valve 16 and the second air inlet valve 23 to close, and controls the series circulation pump 14, the water washing pump 18, the backwash fan 19, the water cooling pump 20 and the liquid alkali addition unit to stop operating, so that the wastewater denitrification equipment enters the initial state.

[0068] In one embodiment, in order to further improve the flexibility of the wastewater denitrification equipment that is easy to operate and maintain, a first inlet valve can be installed on the pipeline between the inlet tee and the first inlet, so that the first filter tank 1 and the second filter tank 2 can each have water entering and exiting independently, and the first filter tank 1 or the second filter tank 2 can be washed separately.

[0069] In one embodiment, to improve the efficiency of pH adjustment and facilitate operation and maintenance, the wastewater denitrification equipment also includes a flow mixer located in the water storage tank 17 for stirring the water in the water storage tank 17.

[0070] In one embodiment, to facilitate valve control, the valves in this embodiment are preferably solenoid valves.

[0071] The beneficial effects of this application are as follows:

[0072] 1. By setting up the filter media module 4, the loading box 401 bears the weight of the filter media 402. On the one hand, it avoids the direct compression of a large amount of filter media 402, avoiding damage to the structure of the filter media 402 caused by compression, and thus avoiding problems such as uneven flow rate, nitrogen retention and accelerated scaling of the filter media 402 caused by filter media 402 damage. This significantly extends the cycle of operation and maintenance work such as backwashing, nitrogen removal, removal of filter media 402 for cleaning and replacement of filter media 402. On the other hand, there is no need to set additional packing at the bottom of the filter tank to support the filter media 402, which increases the effective tank volume of the filter tank, enabling the equipment to cope with the treatment needs of small water volumes. Combined with the advantage of the equipment being able to be used in series, the equipment has a stronger denitrification capacity under the same volume.

[0073] 2. An air-gathering space is set between the filter media 402 and the top surface of the filling box 401. Since there is no filter media 402 blocking the air-gathering space, on the one hand, the gas can be accelerated to gather and the active nitrogen removal cycle can be extended. On the other hand, the water flow can be re-distributed after passing through the filter media 402, which helps to avoid the interruption of flow caused by uneven water distribution, slows down the scaling speed of the filter media 402, and helps to extend the operation and maintenance cycle.

[0074] 3. By setting the exhaust vent 405, it is beneficial to balance the air pressure of each filter media module 4, ensure that nitrogen is discharged evenly, and thus ensure the uniformity of water flow velocity, and extend the cycle of operation and maintenance work such as active nitrogen removal and water washing.

[0075] 4. A gas collection unit 5 is set up. Since there are no obstructions in the main pipe 501 and the branch pipe 503, the nitrogen in the filter media module 4 tends to be discharged to the outside of the filter tank through the exhaust port 405, the branch pipe 503 and the main pipe 501. This effectively improves the nitrogen exhaust efficiency, reduces the probability of nitrogen remaining in the gaps of the filter media 402, reduces the impact of nitrogen on the filter media 402, and thus effectively extends the active nitrogen removal cycle and extends the working life of the filter media 402.

[0076] 5. The handle 403 is provided to facilitate the removal of the filter media module 4 during operation and maintenance, thereby improving the efficiency of operation and maintenance work such as replacing filter media 402 and manually cleaning filter media 402.

[0077] 6. Based on the pH value and the level gauge 25, it can be determined whether liquid alkali needs to be added to the water storage tank 17, and liquid alkali can be added to the water storage tank 17 through the liquid alkali adding unit.

[0078] 7. It can be determined whether water washing is required based on the change of inlet water pressure or the SS value of the effluent. Water is used in the water storage tank 17 by the water washing pump 18 for water washing, and the wastewater after water washing is incorporated into the wastewater to be denitrified.

[0079] 8. Set up a calculation and control unit 27 to enable the wastewater denitrification equipment to operate automatically and reduce the manpower input for operation and maintenance.

[0080] 9. The equipment adopts steel structure components, which can be modularized and flexibly prefabricated according to the treatment requirements such as water quality and quantity. It can be quickly assembled on site, with a short construction period and no large machinery is required for assembly.

[0081] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and the present invention also intends to include these modifications and variations.

Claims

1. A sewage denitrification device convenient for operation and maintenance, characterized in that, The device comprises a first filter tank, a plurality of filter material modules, a water storage tank and a gas collecting unit. The bottom of the first filter tank is provided with a first water inlet, and the upper part of the first filter tank is provided with a first water outlet pipe. The plurality of filter material modules are horizontally laid on the bottom of the first filter tank and are stacked layer by layer upwards. The outer walls of the horizontally adjacent filter material modules are tightly attached to each other, and the outer walls of the filter material modules are also tightly attached to the inner wall of the first filter tank. The first water outlet pipe is in communication with the water storage tank. The filter material module comprises a filling box and filter material. The bottom and the side wall of the filling box are provided with a plurality of water passing holes, and the filter material is located in the filling box. The filling box is provided with a gas gathering space formed by the top surface of the filter material in the filling box and the side wall of the filling box. The top end of the side wall of the filling box is provided with a plurality of gas discharge notches, and the gas discharge notches of the horizontally adjacent filling boxes are in communication with each other. The gas collecting unit comprises at least one main pipe and a plurality of branch pipes fixed on the outer side of the main pipe and in communication with the main pipe. The main pipe comprises an open top end, and the top end of the main pipe is higher than the liquid level of the first filter tank. A plurality of branch pipes are respectively fixed on the outer wall of the first filter tank and are in communication with the inside of the first filter tank. The positions of the plurality of branch pipes on the outer wall of the first filter tank correspond to the positions of the plurality of gas discharge notches of different heights which are tightly attached to the inner wall of the first filter tank.

2. The sewage denitrification equipment convenient for operation and maintenance according to any of claim 1, characterized in that, The device further comprises a second filter tank, a first water inlet tee joint, a second water inlet tee joint, a parallel water inlet valve, a first water outlet tee joint, a second water outlet tee joint, a parallel water outlet valve and a series circulating pump. The plurality of filter material modules are also horizontally laid on the bottom of the second filter tank and are stacked layer by layer upwards. The bottom of the second filter tank is provided with a second water inlet, and the upper part of the second filter tank is provided with a second water outlet pipe. One end of the first water inlet tee joint is used for inputting sewage. The remaining two ends of the first water inlet tee joint are respectively in communication with the first water inlet and one end of the second water inlet tee joint through pipelines. The parallel water inlet valve is located on the pipeline connecting the first water inlet tee joint and the second water inlet tee joint. The remaining two ends of the second water inlet tee joint are respectively in communication with the second water inlet and the output end of the series circulating pump through pipelines. The first water outlet pipe is in communication with one end of the first water outlet tee joint. The remaining two ends of the first water outlet tee joint are respectively in communication with the second water outlet tee joint and the input end of the series circulating pump through pipelines. The parallel water outlet valve is located on the pipeline connecting the first water outlet tee joint and the second water outlet tee joint. The remaining two ends of the second water outlet tee joint are respectively in communication with the second water outlet pipe and the water storage tank. The device for facilitating operation and maintenance of sewage denitrification comprises a series operation state and a parallel operation state. In the series operation state, the parallel water outlet valve and the parallel water inlet valve are closed, and the series circulating pump operates. In the parallel operation state, the parallel water outlet valve and the parallel water inlet valve are opened, and the series circulating pump stops operating.

3. The sewage denitrification equipment convenient for operation and maintenance according to claim 2, characterized in that, The device also comprises two pH probes, two liquid level meters and a liquid alkali adding unit, the detection ends of the two pH probes are respectively located below the liquid surfaces of the first filter tank and the second filter tank, the two liquid level meters are respectively fixed above the first filter tank and the second filter tank, and the output end of the liquid alkali adding unit is arranged towards the water storage tank.

4. The sewage denitrification equipment convenient for operation and maintenance according to claim 2, characterized in that, The device also comprises a water washing pump, two SS probes and two pressure sensors, the input end of the water washing pump is in communication with the water storage tank through a pipeline, the output end of the water washing pump is in communication with one end of the first water inlet three-way valve for inputting sewage through a pipeline, the detection ends of the two SS probes are respectively located below the liquid surfaces of the first filter tank and the second filter tank, one pressure sensor is located on the pipeline connecting the first water inlet and the first water inlet three-way valve, and the other pressure sensor is located on the pipeline connecting the second water inlet and the second water inlet three-way valve.

5. The sewage denitrification equipment convenient for operation and maintenance according to claim 2, characterized in that, The device also comprises a backwashing air blower, an air washing three-way valve and a water cooling pump, the bottom of the first filter tank is also provided with a first air inlet, the bottom of the second filter tank is also provided with a second air inlet, the output end of the backwashing air blower is in communication with the air washing three-way valve through a pipeline, the remaining two ends of the air washing three-way valve are in communication with the first air inlet and the second air inlet through pipelines respectively, the input end of the water cooling pump is in communication with the water storage tank, the output end of the water cooling pump is in communication with the water cooling inlet of the backwashing air blower through a pipeline, and the water cooling outlet of the backwashing air blower is in communication with the water storage tank through a pipeline.

6. The sewage denitrification equipment convenient for operation and maintenance according to claim 2, characterized in that, The device also comprises two overflow weirs, a first water collecting tank and a second water collecting tank, the first water collecting tank is fixed in the first filter tank and located above the filter material module, the second water collecting tank is fixed in the second filter tank and located above the filter material module, the two overflow weirs are respectively arranged on the side walls of the first water collecting tank and the second water collecting tank, through which the liquid in the first filter tank and the second filter tank overflows, the first water collecting tank is connected with one end of the first water outlet three-way valve through a first water outlet pipeline, and the second water collecting tank is connected with one end of the second water outlet three-way valve through a second water outlet pipeline.

7. The sewage denitrification equipment convenient for operation and maintenance according to claim 2, characterized in that, The device also comprises a calculation control unit, the calculation control unit is electrically connected with the parallel water inlet valve, the parallel water outlet valve and the series circulating pump, the calculation control unit controls the opening and closing of the parallel water inlet valve and the parallel water outlet valve, and the calculation control unit controls the start and stop of the series circulating pump.

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