Denitrification filtering system for water treatment
By using a combination of suspended lightweight packing material and fiber filter cloth in the denitrification filter, and changing the water inlet method to bottom-up, the problems of filter media caking and high energy consumption were solved, achieving efficient nitrogen removal and reduced energy consumption.
Patent Information
- Application Number
- CN202422738121.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-11
AI Technical Summary
Existing denitrification filters are prone to caking during nitrogen and turbidity removal, requiring regular nitrogen removal, which leads to high energy consumption and increased costs.
The denitrification suspended lightweight packing treatment structure is adopted. By changing the water inlet method to bottom-up and setting suspended lightweight packing in the treatment chamber, combined with fiber filter cloth, the backwash water pump is eliminated. Backwashing is achieved by air scrubbing and periodic venting.
It effectively avoids filter media caking, significantly improves denitrification efficiency, reduces energy consumption and costs, and extends equipment lifespan.
Smart Images
Figure CN223522357U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a denitrification filter system, especially to a denitrification filter system for water treatment, belongs to water treatment engineering structure design and manufacture technical field. BACKGROUND
[0002] With increasingly strict sewage discharge standards in China, the effluent indexes of total nitrogen and turbidity are continuously improved, and the denitrification filter tank, as a treatment unit integrating biological denitrification and filtration functions, emerges as the times require and is widely used in municipal sewage advanced treatment, industrial wastewater treatment and other fields. The denitrification filter tank cultivates biofilm on filter material, uses denitrifying bacteria in the biofilm to remove nitrate in water through the denitrification effect of organic matter, and removes suspended solids in water through the interception effect of the filter material itself, thereby meeting the needs of denitrification and turbidity removal.
[0003] The denitrification filter tank commonly used in the market usually uses quartz sand or sea sand meeting the requirements as filter material, adopts the pool type of downward flow air-water backwashing filter tank, and the water is fed from the top and discharged from the bottom. The filter tank is provided with special filter bricks for uniform water and air distribution, and is equipped with a backwashing water pump and a fan to meet the cleaning needs of long-term operation of the filter material. During normal filtration, the water is fed into the filter tank after adding carbon source, flows through the filter material from top to bottom, and the turbidity and total nitrogen in the water are effectively removed through the interception effect of the filter material and the denitrification effect of the biofilm on the filter material. Every certain period of time, the filter tank needs to be aerated to remove the nitrogen gas generated in the denitrification process. During backwashing, the water pump and the fan provide water and air required for washing the filter tank, wash the filter material from bottom to top, restore the treatment capacity of the filter material, and prevent the filter material from being clogged and hardened.
[0004] The specific surface area and internal porosity of quartz sand or sea sand as filter material are small. In order to maximize the specific surface area, the particle size of the filter material is usually small, and the packing height needs to reach more than 1.83m. In addition, special filter bricks need to be set to support the filter material and ensure uniform water and air distribution. The denitrification filter tank operates as a fixed bed, the filter material layer intercepts suspended solids and grows biofilm, and is easy to harden, so it needs to be configured with air-water combined backwashing. UTILITY MODEL CONTENTS
[0005] The utility model solves the technical problem of providing a denitrification filter system for water treatment which does not need to remove nitrogen from the water and can significantly improve the denitrification effect.
[0006] The technical scheme adopted to solve the above technical problems is: a denitrification filter system for water treatment, comprising a treatment cavity, an input structure and an output structure, and further comprising a denitrification suspended lightweight filler treatment structure, the treatment cavity vertically comprises at least a sewage discharge area, a water treatment area and a clean water area from bottom to top, the denitrification suspended lightweight filler treatment structure is movably arranged in the water treatment area, sewage to be treated is input into the treatment cavity from the bottom sewage discharge area under the cooperation of the input structure, clean water after treatment is output from the top clean water area of the treatment cavity under the cooperation of the output structure, and accumulated sewage at the bottom of the sewage discharge area is discharged from the treatment cavity through the output structure.
[0007] Further, the treatment cavity is composed of a vertically arranged cylindrical closable tank body, a middle filter plate is arranged in the middle of the water treatment area, the denitrification filter system further comprises a backwashing aeration structure, the denitrification suspended lightweight filler treatment structure is movably arranged in the water treatment area below the middle filter plate, the backwashing aeration structure is arranged in the water treatment area below the denitrification suspended lightweight filler treatment structure, the input structure comprises a sewage input pipe and a backwashing aeration input pipe, sewage to be treated is input into the treatment cavity from the top of the sewage discharge area through the sewage input pipe, and the backwashing aeration input pipe is connected with the backwashing aeration structure through the end thereof extending into the treatment cavity.
[0008] The preferred mode of the above scheme is that a lower filter plate is further arranged between the sewage discharge area and the water treatment area, the backwashing aeration structure comprises an aeration coil pipe and aeration cross pipes, at least two aeration cross pipes are arranged on the aeration coil pipe in the radial direction, and the aeration coil pipe is arranged in the water treatment area below the denitrification suspended lightweight filler treatment structure through the lower filter plate.
[0009] Further, the middle filter plate is arranged on the treatment cavity in the middle of the water treatment area through a circular square pipe support frame, the lower filter plate is arranged on the treatment cavity in the lower part of the water treatment area through a circular square pipe support frame with a cross-shaped square pipe support frame arranged in the middle, and the water treatment area is divided into a lower denitrification lightweight filler area and an upper secondary reaction area through the middle filter plate; a middle vent pipe of the output structure is further arranged on the wall of the treatment cavity in the middle of the water treatment area, and backwashing water in the water treatment area is discharged through the middle vent pipe during backwashing operation.
[0010] The preferred mode of the above scheme is that the denitrification suspended lightweight filler treatment structure is a high-molecular lightweight elastic permeable foam filler with a particle size of 8mmx8mmx8mm filled in the denitrification lightweight filler area, the filling height of the high-molecular lightweight elastic permeable foam filler in the denitrification lightweight filler area is not more than 1.5m, and the height of the secondary reaction area is not less than 1m.
[0011] Further, the sludge discharge pipe with output structure is arranged in the sludge discharge area, and the sludge discharge pipe comprises a main sludge discharge pipe and at least three Y-shaped sludge discharge branch pipes. A downwardly open horn-shaped suction inlet is arranged at the end of the vertical side of each Y-shaped sludge discharge branch pipe. Each Y-shaped sludge discharge branch pipe is connected to the main sludge discharge pipe through the end of the horizontal side of the Y-shaped sludge discharge branch pipe in a Y-shaped manner in the horizontal plane along the length direction of the main sludge discharge pipe. The end of the main sludge discharge pipe, at which the Y-shaped sludge discharge branch pipe is arranged, extends out of the wall of the treatment cavity of the sludge discharge area. The Y-shaped sludge discharge branch pipes arranged in the sludge discharge area through the main sludge discharge pipe are uniformly distributed in the horizontal plane of the sludge discharge area.
[0012] Preferably, a water blocking filter plate is further arranged between the water treatment area and the clean water area. The clean water that meets the treatment requirement enters the clean water area through the water blocking filter plate. The clean water input end of the clean water output pipe with output structure is arranged above the water blocking filter plate in the clean water area. The end of the clean water output pipe in the clean water area is in a Y-shaped structure. A horn-shaped suction inlet that is open upwardly is arranged at the end of the vertical side of the Y-shaped clean water output pipe.
[0013] Further, the water blocking filter plate comprises a water blocking plate and a clean water filter assembly. Six water passing holes are uniformly distributed on the water blocking plate in the circumferential direction. The clean water filter assembly comprises six cylindrical filter frames and six groups of fiber filter cloths. A plurality of water outlet holes are arranged on the side wall of each cylindrical filter frame. Each cylindrical filter frame that is covered with a group of fiber filter cloths one by one is covered with the corresponding water passing hole through the open lower end.
[0014] Preferably, a ventilation pipe is further arranged on the top of each cylindrical filter frame. The air outlet end of each ventilation pipe extends out of the treatment cavity from the top. At least one ventilation pipe arranged at a position above the clean water level is provided with an overflow pipe.
[0015] Further, a filtered clean water output pipe with output structure is arranged in the middle and upper part of the clean water area. A clean water vent pipe with output structure is arranged on the wall of the treatment cavity at the bottom of the clean water area. A bottom vent pipe with output structure is arranged on the wall of the treatment cavity at the bottom of the sludge discharge area. At least a climbing ladder extending in the vertical direction is arranged on the inner wall of the treatment cavity in the clean water area. An inspection hole and a cover plate are arranged at the top of the treatment cavity and the position of the climbing ladder.
[0016] The beneficial effect of the utility model discloses: the technical scheme provided by the application is through increasing the arrangement of the denitrification suspended light filler processing structure in the processing cavity, and the processing cavity is divided into the pollution discharge area, the water treatment area and the clear water area from bottom to top in the vertical direction, then the denitrification suspended light filler processing structure is arranged in the water treatment area, and the sewage needing to be treated is input into the processing cavity from the bottom pollution discharge area under the cooperation of the input structure, and the clear water of the processing qualification is output from the top clear water area of the processing cavity under the cooperation of the output structure, finally the accumulated dirt deposited in the bottom of the pollution discharge area is discharged from the processing cavity through the output structure. Thus, since the structure for water treatment of the application, especially the denitrification suspended light filler processing structure for the functions of denitrification and filtration, is suspended in the processing cavity, then the arrangement mode of the incoming water is improved from the original upper input and lower output to lower input and upper output, thereby not only can effectively avoid the compaction of the filter material layer of the growth denitrification biofilm, and further achieve the purpose of not needing to remove nitrogen from the incoming water, but also can significantly improve the denitrification effect, and simultaneously since the arrangement structure of the incoming water is completely different, the backwashing can be directly realized through emptying, and the backwashing water pump originally needed to be arranged in the whole structure can be effectively cancelled, thereby achieving the purpose of prolonging the service time of the structure, significantly reducing the energy consumption and saving the cost. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 The arrangement structure schematic view of the filter plate support frame related to the denitrification filtration system for water treatment of the utility model discloses;
[0018] Figure 2 The A-A sectional view of Figure 1 ; The B-B sectional view of
[0019] Figure 3 The B-B sectional view of Figure 1 ; The 1-1 to 5-5 sectional view of
[0020] Figures 4 to 8 The 1-1 to 5-5 sectional view of Figure 2 or Figure 3 .
[0021] In the drawing, the mark is: processing cavity 1, middle filter plate 2, backwashing aeration structure 3, sewage input pipe 4, backwashing aeration input pipe 5, lower filter plate 6, circular square pipe support frame 7, middle emptying pipe 8, denitrification suspended light filler processing structure 9, sludge main pipe 10, type sludge branch pipe 11, horn type suction port 12, water baffle 13, cylindrical filter frame 14, ventilation pipe 15, overflow pipe 16, emptying pipe 17, bottom emptying pipe 18, cross square pipe support 19, filtered water outlet pipe 20. DETAILED DESCRIPTION
[0022] As Figures 1 to 8The utility model provides a kind of denitrification filtration system for water treatment to the water inlet need not remove nitrogen, also can significantly improve the effect of denitrification. The denitrification filtration system includes processing cavity 1, input structure and output structure, the denitrification filtration system at least includes denitrification suspended lightweight filler processing structure 9, processing cavity 1 is at least including sewage area, water treatment area and clear water area from bottom to top along vertical direction, denitrification suspended lightweight filler processing structure 9 is movably arranged in water treatment area, sewage needing processing is input processing cavity 1 from the sewage area of bottom under the cooperation of input structure, clear water of processing qualification is output processing cavity 1 from the clear water area of top under the cooperation of output structure, and accumulated dirt deposited in the bottom of sewage area is discharged from processing cavity by output structure. The technical scheme provided by the present application increases the setting of denitrification suspended lightweight filler processing structure in processing cavity, and at least divides the processing cavity into sewage area, water treatment area and clear water area from bottom to top along vertical direction, then movably arranges denitrification suspended lightweight filler processing structure in water treatment area, and makes sewage needing processing input processing cavity from the sewage area of bottom under the cooperation of input structure, and makes clear water of processing qualification output processing cavity from the clear water area of top under the cooperation of output structure, and finally makes accumulated dirt deposited in the bottom of sewage area discharge from processing cavity by output structure. In this way, since the structure for water treatment of the present application, especially the denitrification suspended lightweight filler processing structure for nitrogen removal and filtration function, is suspended in the processing cavity, and then the arrangement of the entering water is improved from the original upper inlet and lower outlet to the arrangement of lower time and upper front, the filter material layer of denitrification biofilm can be effectively prevented from being hardened, thereby achieving the purpose of not needing to remove nitrogen for the water inlet, and significantly improving the effect of denitrification. At the same time, since the arrangement structure of the entering water is completely different, backwashing can be realized directly by venting, and the backwashing water pump originally needed to be arranged in the entire structure can be effectively cancelled, thereby prolonging the service time of the structure, significantly reducing energy consumption and saving cost.
[0023] In combination with the actual situation of sewage treatment, in order to facilitate manufacturing, installation and maintenance, the treatment cavity 1 of the present application is composed of a vertically arranged cylindrical closable tank, at least a middle filter plate 2 is arranged in the middle of the water treatment area, the denitrification filter system further comprises a backwashing aeration structure 3, the denitrification suspended lightweight filler treatment structure 9 is movably arranged in the water treatment area below the middle filter plate 2, the backwashing aeration structure 3 is arranged in the water treatment area below the denitrification suspended lightweight filler treatment structure 9, the input structure comprises a sewage input pipe 4 and a backwashing aeration input pipe 5, the sewage to be treated is input into the treatment cavity 1 from the top of the sewage area through the sewage input pipe 4, the backwashing aeration input pipe 5 is connected with the backwashing aeration structure 3 through the end thereof extending into the treatment cavity. Correspondingly, in order to partition the treatment cavity 1 of the present application and arrange the internal structure, the present application further comprises a lower filter plate 6 arranged between the sewage area and the water treatment area, the backwashing aeration structure 3 comprises an aeration coil pipe and an aeration cross pipe, at least two aeration cross pipes are arranged on the aeration coil pipe in the radial direction, the aeration coil pipe is arranged in the water treatment area below the denitrification suspended lightweight filler treatment structure 9 through the lower filter plate 6. A water blocking filter plate is further arranged between the water treatment area and the clean water area, the treated clean water enters the clean water area through the water blocking filter plate, the clean water input end of the clean water output pipe of the output structure is arranged in the clean water area above the water blocking filter plate, the end of the clean water output pipe in the clean water area is in a shape of a Chinese character "", and a horn-shaped suction inlet 12 is arranged at the end of the vertical side of the Chinese character "" shaped clean water output pipe.
[0024] Further, the middle filter plate 2 of the present application is arranged on the treatment cavity 1 in the middle of the water treatment area through a circular square tube support frame 7, the lower filter plate 6 is arranged on the treatment cavity 1 in the lower part of the water treatment area through a circular square tube support frame 7 with a cross-shaped square tube support 19 arranged in the middle, the water treatment area is divided into the lower denitrification light filler area and the upper secondary reaction area through the middle filter plate 2; the middle emptying pipe 8 with output structure is further arranged on the wall of the treatment cavity in the middle of the water treatment area, the backwashing water located in the water treatment area is discharged through the middle emptying pipe 8 during the backwashing operation. The denitrification suspended light filler treatment structure 9 is the high-molecular light elastic permeable bubble hole filler with the particle size of 8mmx8mmx8mm filled in the denitrification light filler area, the filling height of the high-molecular light elastic permeable bubble hole filler in the denitrification light filler area is not more than 1.5m, the height of the secondary reaction area is not less than 1m. The sludge discharge pipe with output structure is arranged in the sewage discharge area, the sludge discharge pipe includes a sludge discharge main pipe 10 and at least three ∽-shaped sludge discharge branch pipes 11, the downwardly open horn-shaped suction inlet 12 is arranged at the end of the vertical side of each ∽-shaped sludge discharge branch pipe, each ∽-shaped sludge discharge branch pipe 11 is connected with the sludge discharge main pipe 10 through the end of the horizontal side in the Y-shaped direction along the length direction of the sludge discharge main pipe in the horizontal plane, the end of the sludge discharge main pipe 10, where the ∽-shaped sludge discharge branch pipe 11 is arranged, extends out of the wall of the treatment cavity of the sewage discharge area, each ∽-shaped sludge discharge branch pipe 11 arranged in the sewage discharge area is uniformly distributed in the horizontal plane of the sewage discharge area. More specifically, the water blocking filter plate of the present application includes the water blocking plate 13 and the clean water filtering assembly, six water passing holes are uniformly distributed on the water blocking plate 13 in the circumferential direction, the clean water filtering assembly includes six cylindrical filtering frames 14 and six groups of fiber filtering cloths, a plurality of water outlets are arranged on the side wall of each cylindrical filtering frame 14, each cylindrical filtering frame 14 is covered with a group of fiber filtering cloths one by one through the open lower end.
[0025] At the same time, in order to ensure the emptying and cleaning operation of the gas in the treatment cavity, a ventilation pipe 15 is further arranged at the top of each cylindrical filtering frame 14, the gas outlet end of each ventilation pipe 15 extends out of the treatment cavity 1 from the top, at least one ventilation pipe 15 arranged at the position above the clean water level is provided with the overflow pipe 16. The filtered water pipe 20 with output structure is arranged in the middle and upper part of the clean water area, the clean water emptying pipe 17 with output structure is arranged on the wall of the treatment cavity at the bottom of the clean water area, the bottom emptying pipe 18 with output structure is arranged on the wall of the treatment cavity at the bottom of the sewage discharge area, at least a climbing ladder extending in the vertical direction is arranged on the inner wall of the treatment cavity in the clean water area, the access hole and the cover plate are arranged at the position corresponding to the climbing ladder at the top of the treatment cavity.
[0026] In summary, the technical scheme of the application changes the water inlet mode of the device to be from bottom to top, avoids oxygenation of the water inlet, and nitrogen generated by denitrification is taken out of the device with the water inlet, so that nitrogen removal is not needed to be performed periodically. In addition, the water flow from top to bottom during venting forms backwashing relative to the water inlet, so that a backwashing water pump is cancelled, and cost and energy consumption are saved.
[0027] The technical scheme of the application is further described below through specific embodiments:
[0028] Embodiment one
[0029] The integrated device, i.e., the denitrification filtration system described above, is a cylindrical closed tank, which is internally divided into four areas from bottom to top, i.e., a sludge discharge area, a filler area, an upper reaction area, and a clean water area.
[0030] The sludge discharge area is provided with a sludge discharge pipeline, which is arranged in a Y shape inside the tank and is provided with a downward-opening horn at the end of the pipeline, which can discharge sludge deposited at the bottom of the tank. The sludge discharge pipeline penetrates out of the tank and is connected to the outside of the tank, and an electric valve and a manual valve are arranged on the sludge discharge pipeline. A backwashing pipeline is also connected to the sludge discharge pipeline, which can be used to flush the sludge discharge pipeline with external pressure water when the sludge discharge pipeline is blocked. The valves are arranged in a valve well.
[0031] The top of the sludge discharge area is also connected to a water inlet pipeline, and the water to be treated is connected to the tank through the water inlet pipeline. The water inlet pipeline is provided with an electric valve and a manual valve.
[0032] The filler area is provided with a filter plate at the bottom, which is composed of a 304 stainless steel hole plate and a support frame. The filter plate serves to support the filler above and uniformly distribute water. The filter plate is uniformly provided with 5mm round holes with a hole spacing of 10mm. The support frame is composed of an annular square tube frame and a cross-shaped square tube support in the annular square tube frame, which is connected by bolts and eight angle steels arranged uniformly along the periphery of the tank and welded to the tank.
[0033] An aeration coil is arranged on the filter plate and is fixed on the filter plate by a pipe clamp. The aeration coil is arranged in an octagonal shape and is provided with a communication cross branch pipe in the middle. This arrangement can make the air distribution more uniform. The top of the aeration coil is provided with holes with a hole diameter of 4mm and a hole spacing of 250mm. The aeration coil is connected to the outside of the tank through a connected aeration main pipe. The aeration main pipe is provided with an electric valve, a manual valve, and an air flow meter on the outside of the tank. A part of the aeration main pipe needs to be 10cm higher than the top of the tank to avoid water backflow. The aeration main pipe is connected to an aeration fan on the outside, which provides air source for the device.
[0034] The filler area is also provided with light filler, which is made of high molecular chemical material with light weight, and the specific gravity is 1-1.04g / cm3 after being immersed in water. The filler has elastic and permeable pores, large specific surface area (more than 20000㎡ / m³), inert hydrophilic, good chemical and physical stability, easy to form film, and the size of single filler can reach 8mm×8mm×8mm. The filling height of the filler is 1.2-1.5m. The upper part of the light filler is provided with a middle filter plate, and the middle filter plate is made in the same way as the lower filter plate. The space between the middle filter plate and the filler is 300mm.
[0035] The upper part of the filler area is the upper reaction area, and the height of the upper reaction area is 1100mm. The lower part of the upper reaction area is connected with a middle vent pipe, and the vent pipe is provided with an electric valve and a manual valve and connected to the water drainage system outside the tank.
[0036] The upper side of the upper reaction area is provided with a water baffle and a fiber filter cloth assembly. The water baffle is a circular plate, which is welded around the tank, and six circular holes are opened on the plate. The circular holes are uniformly arranged in a ring type around the center of the tank. The fiber filter cloth assembly is composed of a cylindrical frame and a fiber filter cloth, and a total of six fiber filter cloth assemblies are provided. The diameter of the cylindrical frame is consistent with the hole, and the bottom is provided with a flange, which is connected to the water baffle through bolts and is installed and fixed in alignment with the opening on the water baffle. The fiber filter cloth covers the four sides of the cylindrical frame. The top of the cylindrical frame is a baffle, and the baffle is provided with an opening and a vent pipe. The vent pipe extends to the outside of the tank, and then connects a vent elbow.
[0037] The upper part of the water baffle is the clear water area, and the clear water area is provided with a water outlet pipe, an overflow pipe and a vent pipe. The water outlet pipe is provided with an upward horn in the tank, and then connected to the outside of the tank through a pipe. The overflow pipe is connected to the top of the vent pipe of one of the fiber filter cloth assemblies through a tee joint, and extends to the outside of the tank through the tank. The vent pipe is arranged at the bottom of the clear water area and connected to the tank, and connected to the outside of the tank. The water outlet pipe outside the tank is provided with an electric valve and a manual valve. The vent pipe outside the tank is provided with a manual valve.
[0038] The top of the tank is provided with an inspection hole, and the inspection hole is provided with an openable cover plate for personnel to enter the inside of the tank for maintenance.
[0039] The side of the tank is provided with an observation window in the upper reaction area and the filler area, which is convenient for personnel to observe the running condition of the inside of the tank from the outside. The inside of the observation window is provided with a flushing water pipe, which is connected to the inside of the observation window from the outside of the tank, and can flush the inner surface of the observation window. The flushing water pipe outside the tank is provided with a control valve.
[0040] Function realization:
[0041] 1) Water treatment process:
[0042] The device uses upward flow operation for water inlet, and the water is discharged from the bottom and the water is discharged from the top. The water enters from the sludge discharge area, uniformly distributes through the filter plate, and then enters the filler area. The light filler has a porous structure and is in a suspended state in the water under the impact of the incoming water, and a large number of denitrifying bacteria are cultured inside. The denitrifying bacteria in the filler use the carbon source in the incoming water to convert nitrate nitrogen in the incoming water into nitrogen, thereby achieving the effect of denitrification. The light filler in a suspended state and the incoming water are fully mixed and contacted in the filler area, and the mass transfer efficiency is very high.
[0043] The water passes through the filler area and comes to the upper reaction area. A large number of microorganisms in the filler area are brought out and released in this area. The water continues to react in this area to continue denitrification.
[0044] The denitrified water continues to go upwards and passes through the fiber filter column. The fiber filter cloth retains the suspended matter and the bacterial population in the water to ensure that the SS of the effluent meets the standard. The nitrogen produced in the denitrification process overflows upwards with the water flow and is discharged through the air pipe at the top of the filter column, without the need for a nitrogen discharge device.
[0045] The filtered water enters the clear water area and is discharged through the effluent pipe of the clear water area to complete the water treatment process.
[0046] 2) Backwashing process
[0047] When the device is operated for a period of time, a large amount of microbial membrane will be hung on the filler, and a large amount of suspended matter will be retained on the fiber filter cloth. At this time, the backwashing process can be started. Backwashing is divided into two working conditions. When the main purpose is to remove the excess microbial membrane on the filler, the valve on the water inlet pipe is closed to stop the water inlet, and the aeration blower is started. The gas is uniformly distributed in the filler area through the aeration coil, so that the filler slightly expands and rubs each other, and the biological membrane detached in this process is mostly suspended in the reaction area. After a certain period of time, the middle vent pipe is opened, and the detached biological membrane is discharged from the device. When the main purpose is to backwash the fiber filter cloth, the valve on the water inlet pipe is closed to stop the water inlet, and the sludge discharge pipe valve at the bottom of the tank is opened. Under the action of the pressure difference between the inside and outside of the tank, the water in the clear water area flows reversely through the fiber filter cloth and the light filler at a relatively fast speed, and finally is discharged from the tank through the pipeline in the sludge discharge area, thereby completing the backwashing of the light filler and the fiber filter cloth. This process can be automatically operated through the electric valve on the pipeline.
[0048] Compared with the prior art, the denitrification filtration system provided by the application also has the following advantages,
[0049] 1. Replace the filter media with lightweight packing material, and simultaneously install fiber filter cloth to trap suspended solids. The lightweight packing material uses a lightweight polymer chemical material with elastic, permeable pores, a large specific surface area (greater than 20,000 m² / m³), is inert and hydrophilic, has good chemical and physical stability, and is easy to attach a biofilm. The size of a single packing material can be as small as 8mm × 8mm × 8mm. Using the above packing material, the packing height can be reduced, and the packing material is suspended in the water, greatly simplifying the support structure and water distribution structure.
[0050] 2. Suspended packing material has sufficient contact with water, resulting in high mass transfer efficiency and high treatment efficiency.
[0051] 3. In this application, the water inlet flows from bottom to top. Through the suspension of the lightweight packing material and the separately set fiber filter cloth, the two functions of denitrification and filtration are separated, which avoids the packing material from caking and reduces the difficulty of backwashing. Therefore, this application does not require a dedicated backwashing water pump. The cleaning process can be completed with only air wiping and periodic venting devices.
[0052] 4. The overall device configuration is simple, eliminating the need for a backwash water pump and saving energy.
[0053] 5. Compared to traditional denitrification filters, no nitrogen removal device is required.
Claims
1. Denitrifying filtration system for water treatment, comprising a treatment chamber (1), an input structure and an output structure, characterized in that: The denitrification filter system further comprises a denitrification suspended lightweight filler treatment structure (9). The treatment container (1) comprises a vertically arranged cylindrical closable tank body, and a middle filter plate (2) is arranged in the middle of the water treatment zone. The denitrification filter system further comprises a backwashing aeration structure (3). The denitrification suspended lightweight filler treatment structure (9) is arranged in the water treatment zone below the middle filter plate (2) through the middle filter plate (2). The backwashing aeration structure (3) is arranged in the water treatment zone below the denitrification suspended lightweight filler treatment structure (9). The input structure comprises a sewage input pipe (4) and a backwashing aeration input pipe (5). The sewage to be treated is input into the treatment container (1) from the top of the sewage discharge zone through the sewage input pipe (4). The backwashing aeration input pipe (5) is connected with the backwashing aeration structure (3) through the end of the backwashing aeration input pipe (5) extending into the treatment container.
2. The denitrifying filtration system for water treatment according to claim 1, characterized by: A lower filter plate (6) is further arranged between the sewage discharge zone and the water treatment zone. The backwashing aeration structure (3) comprises an aeration coil pipe and aeration cross pipes. At least two aeration cross pipes are arranged on the aeration coil pipe in the radial direction. The aeration coil pipe is arranged in the water treatment zone below the denitrification suspended lightweight filler treatment structure (9) through the lower filter plate (6).
3. The denitrifying filtration system for water treatment according to claim 2, characterized in that: The middle filter plate (2) is arranged on the treatment container (1) in the middle of the water treatment zone through a circular square pipe support frame (7). The lower filter plate (6) is arranged on the treatment container (1) at the lower part of the water treatment zone through a circular square pipe support frame (7) with a cross-shaped square pipe support frame (19) arranged in the middle. The water treatment zone is divided into a lower denitrification lightweight filler zone and an upper secondary reaction zone through the middle filter plate (2). A middle vent pipe (8) of the output structure is further arranged on the wall of the treatment container in the middle of the water treatment zone. The backwashing water in the water treatment zone is discharged through the middle vent pipe (8) during the backwashing operation.
4. The denitrifying filtration system for water treatment according to claim 2 or 3, characterized in that: The denitrification suspended lightweight filler treatment structure (9) is a high-molecular lightweight elastic permeable foam filler with a particle size of 8mm×8mm×8mm filled in the denitrification lightweight filler zone. The filling height of the high-molecular lightweight elastic permeable foam filler in the denitrification lightweight filler zone is not more than 1.5m, and the height of the secondary reaction zone is not less than 1m.
5. The denitrifying filtration system for water treatment according to claim 4, characterized by: 6. The denitrifying filtration system for water treatment according to claim 5, characterized by: The sludge discharge pipe with output structure is arranged in the sludge discharge area, and includes a sludge main pipe (10) and at least three inverted T-shaped sludge branch pipes (11). A downward open horn-shaped suction inlet (12) is arranged at the end of the vertical side of each inverted T-shaped sludge branch pipe. Each inverted T-shaped sludge branch pipe (11) is connected to the sludge main pipe (10) through the end of the horizontal side in the length direction of the sludge main pipe in the Y-shaped plane. The end of the sludge main pipe (10) where the inverted T-shaped sludge branch pipes (11) are arranged extends out of the wall of the treatment cavity of the sludge discharge area. The inverted T-shaped sludge branch pipes (11) arranged in the sludge discharge area are uniformly distributed in the horizontal plane of the sludge discharge area through the sludge main pipe (10).
7. The denitrifying filtration system for water treatment according to claim 6, characterized by: A water blocking filter plate is arranged between the water treatment area and the clear water area. The treated clear water enters the clear water area through the water blocking filter plate. The clear water input end of the clear water output pipe with output structure is arranged above the water blocking filter plate in the clear water area. The end of the clear water output pipe in the clear water area is in a V-shaped structure. A upward open horn-shaped suction inlet (12) is arranged at the end of the vertical side of the V-shaped clear water output pipe.
8. The denitrifying filtration system for water treatment according to claim 7, characterized by: The water blocking filter plate includes a water blocking plate (13) and a clear water filter assembly. Six water passing holes are uniformly distributed on the water blocking plate (13) in the circumferential direction. The clear water filter assembly includes six cylindrical filter frames (14) and six groups of fiber filter cloths. A plurality of water outlet holes are arranged on the side wall of each cylindrical filter frame (14). Each cylindrical filter frame (14) is covered with a group of fiber filter cloths one by one through the open lower end.
9. The denitrifying filtration system for water treatment according to claim 8, characterized in that: A ventilation pipe (15) is arranged on the top of each cylindrical filter frame (14). The air outlet end of each ventilation pipe (15) extends out of the treatment cavity (1) from the top. At least one ventilation pipe (15) arranged above the clear water level is provided with an overflow pipe (16).
10. The denitrifying filtration system for water treatment according to claim 9, characterized in that: A filtered water output pipe (20) with output structure is arranged in the middle and upper part of the clear water area. A clear water vent pipe (17) with output structure is arranged on the wall of the treatment cavity at the bottom of the clear water area. A bottom vent pipe (18) with output structure is arranged on the wall of the treatment cavity at the bottom of the sludge discharge area. At least a vertical ladder is arranged on the inner wall of the treatment cavity in the clear water area. An inspection hole and a cover plate are arranged on the top of the treatment cavity corresponding to the position of the ladder.