Denitrifying deep-bed filter

Abstract

This invention relates to the field of denitrification deep bed filter technology, and provides a denitrification deep bed filter, including a bottom collection mechanism and a denitrification treatment tank. The denitrification treatment tank is installed on the upper end of the bottom collection mechanism by screws. A denitrification filtration mechanism is installed inside the denitrification treatment tank. A liquid input mechanism is installed at the rear end of the denitrification treatment tank, and the liquid input mechanism is connected to an external liquid input pipe. A filter assembly is installed at the rear end of the denitrification treatment tank. This invention achieves initial flow dispersion by equipping the inlet with a perforated triangular flow divider. A first flow equalization panel and a second flow equalization panel are respectively set between the filter layers to form a double-layer flow equalization structure. After multi-stage dispersion and rectification, the water flow uniformly penetrates the quartz sand filter layer and the graded gravel filter layer, directly achieving the ability of uniform water distribution throughout the entire area and eliminating the impact of local concentrated water flow on the filter media.

Description

Technical Field

[0001] This invention relates to the field of denitrification deep bed filter technology, and more specifically, to a denitrification deep bed filter. Background Technology

[0002] The denitrification deep bed filter is a wastewater deep treatment structure that integrates biological denitrification and deep bed physical filtration. It is mostly used after the secondary sedimentation tank in wastewater treatment plants to simultaneously remove nitrate nitrogen and suspended solids (SS), and assist in the removal of total phosphorus. It is the core process unit for upgrading wastewater to Class A or near Class IV surface water standards.

[0003] Existing Chinese patent CN118495698A discloses a denitrification deep bed filter in the field of wastewater treatment technology. It addresses the issue of wastewater impact on the filter media surface affecting the uniformity of filter media distribution. The filter includes a main body containing a wastewater tank and a rectangular array of filter tanks. Uniformly distributed drainage shells are fixed within each filter tank. Equally spaced water-guiding shells are slidably connected within the drainage shells. Sliding pipes are slidably connected to the water-guiding shells. A diversion shell is connected to the lower side of the sliding pipe. A rectangular array of baffles is rotatably connected to the diversion shell. A through-hole is provided on the side of the drainage shell near the inlet pipe.

[0004] However, the aforementioned denitrification deep bed filter uses a distribution shell for overall flow distribution during processing, but lacks a corresponding flow equalization panel mechanism. This results in the input liquid not being processed evenly in each layer, which can easily lead to concentrated filtration and damage, making the overall processing core inefficient. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a denitrification deep bed filter that can effectively and uniformly buffer and disperse the liquid in each layer, making it less likely for the filter element to concentrate during filtration, thereby effectively improving the overall service life.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a denitrification deep bed filter, comprising a bottom collection mechanism and a denitrification treatment tank. The denitrification treatment tank is installed on the upper end of the bottom collection mechanism by screws. A denitrification filtration mechanism is installed inside the denitrification treatment tank. A liquid input mechanism is installed at the rear end of the denitrification treatment tank and is connected to an external liquid input pipe. A filter assembly is installed at the rear end of the denitrification treatment tank. The denitrification filtration mechanism includes a quartz sand filter media layer, a first flow equalization panel installed below the quartz sand filter media layer, a graded gravel filter media layer installed below the first flow equalization panel, a second flow equalization panel installed below the graded gravel filter media layer, and a bottom filter assembly installed at the lower end of the second flow equalization panel. The bottom filter assembly includes a filter brick mounting base plate. The inner side of the filter brick mounting base plate has a plurality of uniformly distributed filter brick mounting cavities. The inner side of the plurality of filter brick mounting cavities is embedded and installed on the filter brick mounting base plate with corresponding air-water filter bricks.

[0007] As a preferred technical solution of the denitrification deep bed filter of the present invention, the bottom collection mechanism includes a bottom collection tank seat, a four-hole mounting base plate welded to the lower end of the bottom collection tank seat, a discharge valve welded through the lowest point of the front end of the bottom collection tank seat, a cavity with a lower front and higher rear opening inside the bottom collection tank seat, a rubber pad bonded to the upper end of the bottom collection tank seat with epoxy resin, and a liquid inlet transverse groove opened on the rear side of the upper end of the bottom collection tank seat and the rubber pad.

[0008] As a preferred technical solution of the denitrification deep bed filter of the present invention, the denitrification treatment tank includes an upper denitrification filter tank body. An observation window is installed at the front end of the upper denitrification filter tank body. A maintenance cover is installed on the upper rear end of the upper denitrification filter tank body by screws. A filter assembly is installed inside the upper denitrification filter tank body below the maintenance cover. A bottom drain cover is welded through the lower rear end of the upper denitrification filter tank body. A front-high and rear-low cavity is opened on the inner side of the lower end of the upper denitrification filter tank body. A diversion assembly is installed on the inner side of the front end of the upper denitrification filter tank body.

[0009] As a preferred technical solution of the denitrification deep bed filter of the present invention, the diversion component includes an input horizontal pipe, which is welded through to the upper side of the internal partition of the upper denitrification filter body. The discharge end of the input horizontal pipe is welded through to a drain cover. A triangular diversion plate is installed below the drain cover. Screw mounting plates are symmetrically welded to the lower sides of both ends of the triangular diversion plate. The two screw mounting plates are respectively installed on the inner wall and the internal partition of the upper denitrification filter body by screws.

[0010] As a preferred technical solution of the denitrification deep bed filter of the present invention, the inner side of the triangular diversion plate is provided with uniform mesh holes, and the triangular diversion plate is located above the quartz sand filter media layer.

[0011] As a preferred technical solution of the denitrification deep bed filter of the present invention, the liquid input mechanism includes a lower support plate, the lower end of which is welded to an inspection cover plate. An upper clamping plate is installed above the lower support plate. An external connecting pipe is installed between the lower support plate and the upper clamping plate. The upper clamping plate and the lower support plate are locked together by locking screws. An input right-angle pipe is welded through the lower front end of the external connecting pipe. A connecting sleeve is sleeved around the periphery of the input right-angle pipe. The connecting sleeve is welded to the inner side of the inspection cover plate.

[0012] As a preferred technical solution of the denitrification deep bed filter of the present invention, the filter assembly includes a perforated filter element mounting plate and a PP filter element cotton. The perforated filter element mounting plate is welded to the rear end area of ​​the upper denitrification filter body and the internal partition. The PP filter element cotton is placed on top of the perforated filter element mounting plate. Both the perforated filter element mounting plate and the PP filter element cotton are sleeved on the periphery of the input right angle pipe.

[0013] As a preferred technical solution of the denitrification deep bed filter of the present invention, the bottom drain cover is correspondingly fitted onto the inlet horizontal groove of the bottom collection tank seat.

[0014] As a preferred technical solution of the denitrification deep bed filter of the present invention, the upper denitrification filter body and the bottom collection tank seat are connected by screws and the connection is aligned.

[0015] As a preferred technical solution of the denitrification deep bed filter of the present invention, the drain outlet of the drain cover is located directly above the tip of the triangular diversion plate.

[0016] The advantages of this invention are: 1. The present invention achieves initial flow dispersion by equipping the water inlet with a perforated triangular flow divider plate. A first flow equalization panel and a second flow equalization panel are respectively set between the filter layers to form a double-layer flow equalization structure. After the water flow is dispersed and rectified in multiple stages, it uniformly penetrates the quartz sand filter media layer and the graded gravel filter media, directly possessing the ability to uniformly distribute water throughout the entire area and eliminate the impact of local concentrated water flow on the filter media.

[0017] 2. This invention uses a water inlet pipe to connect a PP filter element and a perforated filter element to form a pre-filter assembly, which can pre-intercept large particulate impurities in the water, preventing large debris from entering the internal filter layer and causing blockage of the air-water filter bricks. The multi-layer gradient filter media combined with the double-layer uniform flow panel forms a stable composite filtration system, resulting in a longer continuous purification cycle for the filter pool, significantly reducing the frequency of cleaning and replacing filter media and filter bricks, and reducing maintenance workload.

[0018] 3. The present invention adopts a split structure, with the upper denitrification filter tank body and the bottom collection tank seat assembled by screws. The front end of the tank body is equipped with an observation window and the rear end is equipped with a detachable maintenance cover, which facilitates intuitive viewing of the filter media working condition and maintenance of internal components. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a denitrification deep bed filter according to the present invention.

[0020] Figure 2 This is a schematic diagram of the upper part of the present invention.

[0021] Figure 3 This is a schematic diagram of the lower part of the present invention.

[0022] Figure 4 This is a schematic diagram of the lower side cross-section of the present invention.

[0023] Figure 5 This is a schematic diagram of the upper cross-section of the present invention.

[0024] Figure 6 This is a schematic diagram of the bottom filter assembly of the present invention.

[0025] Figure 7 This is a schematic diagram of the liquid input mechanism of the present invention.

[0026] Figure 8 This is a schematic diagram of the structure of the current splitter component of the present invention.

[0027] In the attached diagram: 1. Upper denitrification filter tank body; 2. Bottom collection tank seat; 21. Four-hole mounting base plate; 22. Rubber pad; 23. Inlet horizontal channel; 24. Front low and rear high cavity; 3. Discharge valve; 4. Quartz sand filter media layer; 5. External connecting pipe; 51. Upper clamping plate; 52. Locking screw; 53. Lower support plate; 54. Connecting sleeve; 55. Input right angle pipe; 6. Inspection cover plate; 61. PP filter element cotton; 62. Hollowed-out filter element mounting plate; 7. Triangular diverter plate; 71. Screw mounting plate; 8. Inlet horizontal pipe; 81. Drainage cover; 9. Graded gravel filter layer; 10. Air-water filter brick; 101. Filter brick mounting base plate; 102. Filter brick mounting cavity; 11. Observation window; 12. Bottom drainage cover; 13. Front high and rear low cavity; 14. First flow equalization panel; 15. Second flow equalization panel. Detailed Implementation

[0028] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0029] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Example 1: Please see Figures 1-8 Structural diagram; the present invention provides the following technical solution: Specifically, it refers to a denitrification deep-bed filter, including a bottom collection mechanism, a denitrification treatment tank body, a denitrification filtration mechanism, a liquid input mechanism, filter components, and a diversion component. The denitrification treatment tank body is securely assembled to the upper end of the bottom collection mechanism with screws, forming an upper and lower split assembly structure, which is convenient for disassembly and maintenance and has high sealing assembly precision. The denitrification filtration mechanism is integrated inside the denitrification treatment tank body, forming a multi-level gradient filtration structure, which can effectively complete the denitrification and nitrogen removal of wastewater, impurity interception, and water purification operations. The liquid input mechanism is equipped at the rear end of the denitrification treatment tank body, which can stably connect to the external water supply pipeline to achieve continuous and uniform wastewater feeding. The filter components are equipped at the rear end of the denitrification treatment tank body, which can pre-intercept large particulate impurities at the inlet end, protect the internal filter media structure, and prevent clogging and failure.

[0032] The denitrification filtration system, as the core purification structure of the filter bed, adopts a multi-layer composite gradient filtration layout, including a quartz sand filter layer 4. This quartz sand filter layer 4 serves as a surface fine filtration layer, effectively trapping suspended impurities and colloidal pollutants in the wastewater. Simultaneously, it provides a carrier for the attachment and growth of denitrifying bacteria, ensuring the stable denitrification reaction in the water. Below the quartz sand filter layer 4, a first flow equalization panel 14 is installed. This panel performs initial flow equalization and rectification of the falling water, breaking up turbulent and biased flow, ensuring uniform infiltration throughout the entire surface and preventing excessive local flow from damaging the filter layer. Below the first flow equalization panel 14, a graded gravel filter layer 9 is installed. The gravel layer structure further traps large particles of sediment, while supporting the upper quartz sand filter media, preventing the fine filter media from being lost and collapsing, and ensuring the stability of the filter layer structure. Below the graded gravel filter layer 9, a second flow equalization panel 15 is installed to achieve secondary flow equalization and rectification, further optimizing the uniformity of water flow velocity and ensuring stable bottom water pressure. The bottom of the second uniform flow panel 15 is equipped with a bottom filter component to achieve precise water collection and secondary filtration at the bottom layer, and complete the final purification and collection of sewage.

[0033] The bottom filter assembly includes a filter brick mounting base plate 101, which serves as the overall supporting mounting base for the air-water filter bricks 10. The filter brick mounting base plate 101 has a flat surface structure and high load-bearing strength, and can stably support the pressure of the upper filter media and water. Multiple filter brick mounting cavities 102 are evenly formed inside the filter brick mounting base plate 101. The cavities are regularly arranged in an array, and air-water filter bricks 10 are correspondingly embedded inside the multiple filter brick mounting cavities 102. The array arrangement of the air-water filter bricks 10 can achieve uniform water collection and air distribution throughout the entire area. The air-water filter bricks 10 can filter and collect water, and the liquid leaking from the pores of the air-water filter bricks 10 can be effectively transported to the bottom.

[0034] Example 2: Based on Specific Embodiment 1, the difference in this embodiment is as follows: like Figures 1-5 As shown, the bottom collection mechanism includes a bottom collection tank seat 2, which serves as the centralized collection base for the purified water from the filter. A four-hole mounting plate 21 is welded to the lower end of the bottom collection tank seat 2. The four-hole mounting plate 21 can be bolted to secure the entire device to the working foundation. After installation, the four-hole mounting plate 21 ensures stable operation of the bottom collection tank seat 2. A discharge valve 3 is welded through the lowest point of the front end of the bottom collection tank seat 2, allowing for periodic discharge of the treated liquid. The bottom collection tank seat 2 has a cavity 24 with a lower front and higher rear, utilizing the height difference structure to achieve automatic water flow. A rubber gasket 22 is bonded to the upper end of the bottom collection tank seat 2 with epoxy resin adhesive, effectively filling assembly gaps, improving the sealing of the upper and lower joints, and preventing water leakage. A liquid inlet transverse groove 23 is formed on the upper rear side of the bottom collection tank seat 2 and the rubber gasket 22, serving as a flow channel for the filtered water from the upper part to flow downwards into the collection cavity.

[0035] The denitrification treatment tank includes an upper denitrification filter tank 1, which serves as the core operating chamber for wastewater denitrification filtration and purification. An observation window 11 is installed at the front end of the upper denitrification filter tank 1, allowing for real-time and intuitive observation of the filter media status, water flow conditions, and impurity accumulation, facilitating timely operation and maintenance. A maintenance cover 6 is detachably mounted on the upper rear side of the upper denitrification filter tank 1 via screws. Opening the maintenance cover 6 allows for easy inspection and replacement of the internal filter components, simplifying maintenance. Below the maintenance cover 6, corresponding filter components are installed inside the upper denitrification filter tank 1, providing pre-filtration protection for the inlet water. A bottom drain cover 12 is welded through the lower rear side of the upper denitrification filter tank 1, serving as a centralized discharge and guide structure for the filtered water. A front-high, rear-low cavity 13 is formed on the inner side of the lower end of the upper denitrification filter tank 1, creating a regular water flow channel to ensure smooth water flow. A diversion component is installed on the inner front side of the upper denitrification filter tank 1 to achieve uniform water distribution and prevent local water flow from concentrating and impacting the filter media.

[0036] The upper denitrification filter tank body 1 and the bottom collection tank seat 2 are connected by screws, with high overall assembly precision and aligned joints, so that no obstruction occurs during use.

[0037] The bottom drain cover 12 is precisely fitted onto the inlet horizontal groove 23 of the bottom collection tank seat 2, ensuring accurate connection and smooth flow. The filtered water can smoothly flow into the bottom collection tank seat 2 through the bottom drain cover 12 and the inlet horizontal groove 23.

[0038] The diversion assembly includes an input horizontal pipe 8, which is welded through to the upper side of the internal partition of the upper denitrification filter tank 1. The inlet water is strategically positioned, allowing for uniform lateral water transport and effective input of the coarsely filtered liquid. The outlet end of the input horizontal pipe 8 is welded through a drain cover 81, which initially gathers and guides the effluent. Below the drain cover 81, a triangular diversion plate 7 is positioned to disperse the concentrated water flow, achieving uniform water distribution throughout the entire area. Screw mounting plates 71 are symmetrically welded to the lower sides of both ends of the triangular diversion plate 7. These two sets of screw mounting plates 71 are respectively secured to the inner wall and internal partition of the upper denitrification filter tank 1 with screws, ensuring long-term resistance to water flow impact without loosening or deformation.

[0039] The drain outlet of the drain cover 81 is located directly above the tip of the triangular diverter 7, which can effectively divert the flow.

[0040] The triangular diversion plate 7 has evenly distributed diversion mesh holes on its inner side. The water flow is further refined and dispersed through the mesh holes, completely eliminating the problem of concentrated water flow impact, and the water distribution effect is uniform and stable. The triangular diversion plate 7 is precisely placed directly above the quartz sand filter media layer 4, which can evenly distribute the incoming water to the entire surface of the filter media layer, making full use of the entire filtration area of ​​the filter tank, avoiding local overload and clogging of the filter media, and greatly improving the overall filtration and denitrification treatment efficiency.

[0041] Example 3: Based on specific embodiment two, the difference in this embodiment is as follows: like Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, the liquid input mechanism includes a lower support plate 53, the lower end of which is firmly welded to the inspection cover plate 6 to form a stable support base. An upper clamping plate 51 is correspondingly arranged above the lower support plate 53. The lower support plate 53 and the upper clamping plate 51 cooperate to clamp and fix the external connecting pipe 5, ensuring precise pipe positioning and secure clamping. The upper clamping plate 51 and the lower support plate 53 are locked together by two locking screws 52, facilitating easy assembly and disassembly. An input right-angle pipe 55 is welded through the lower front end of the external connecting pipe 5 to achieve vertical water flow into the pool. A connecting sleeve 54 is sleeved around the periphery of the input right-angle pipe 55. The connecting sleeve 54 is welded and fixed to the inside of the inspection cover plate 6, further reinforcing the pipe position and preventing pipe swaying or displacement caused by the impact of incoming water flow, ensuring stable and continuous water intake.

[0042] The filtration assembly includes a perforated filter element mounting plate 62 and a PP filter element cotton 61. The perforated filter element mounting plate 62 is welded and fixedly connected to the upper denitrification filter tank body 1 and the rear end area of ​​the internal partition. The mesh of the perforated filter element mounting plate 62 facilitates liquid flow. The PP filter element cotton 61 is placed and installed on top of the perforated filter element mounting plate 62, and the PP filter element cotton 61 can effectively filter liquid impurities in the water source. Both the perforated filter element mounting plate 62 and the PP filter element cotton 61 are fitted around the perimeter of the inlet right-angle pipe 55, adapting to the pipeline layout and achieving full-area pre-filtration protection for the inlet water. The outlet end of the inlet right-angle pipe 55 is located below the perforated filter element mounting plate 62 and the PP filter element cotton 61, which can effectively filter the water.

[0043] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A denitrification deep bed filter, comprising a bottom collection mechanism and a denitrification treatment tank, characterized in that: The denitrification treatment tank is installed on the upper end of the bottom collection mechanism by screws. A denitrification filtration mechanism is installed inside the denitrification treatment tank. A liquid input mechanism is installed at the rear end of the denitrification treatment tank. The liquid input mechanism is connected to an external liquid input pipe. A filter assembly is installed at the rear end of the denitrification treatment tank. The denitrification filtration mechanism includes a quartz sand filter media layer (4), a first flow equalization panel (14) is installed below the quartz sand filter media layer (4), a graded gravel filter media layer (9) is installed below the first flow equalization panel (14), a second flow equalization panel (15) is installed below the graded gravel filter media layer (9), and a bottom filter assembly is installed at the lower end of the second flow equalization panel (15). The bottom filter assembly includes a filter brick mounting base plate (101), and a plurality of uniformly distributed filter brick mounting cavities (102) are opened on the inner side of the filter brick mounting base plate (101). Corresponding air-water filter bricks (10) are inlaid and installed on the inner side of the plurality of filter brick mounting cavities (102) on the filter brick mounting base plate (101).

2. The denitrification deep bed filter according to claim 1, characterized in that, The bottom collection mechanism includes a bottom collection tank seat (2), a four-hole mounting base plate (21) is welded to the lower end of the bottom collection tank seat (2), a discharge valve (3) is welded through the lowest point of the front end of the bottom collection tank seat (2), a front-low and rear-high cavity (24) is opened inside the bottom collection tank seat (2), a rubber pad (22) is bonded to the upper end of the bottom collection tank seat (2) by epoxy resin adhesive, and a liquid inlet horizontal groove (23) is opened on the rear side of the upper end of the bottom collection tank seat (2) and the rubber pad (22).

3. A denitrification deep bed filter according to claim 1, characterized in that, The denitrification treatment tank includes an upper denitrification filter tank (1). An observation window (11) is installed at the front end of the upper denitrification filter tank (1). A maintenance cover (6) is installed on the upper rear end of the upper denitrification filter tank (1) by screws. A filter assembly is installed inside the upper denitrification filter tank (1) below the maintenance cover (6). A bottom drain cover (12) is welded through the lower rear end of the upper denitrification filter tank (1). A front-high and rear-low cavity (13) is opened on the inner side of the lower end of the upper denitrification filter tank (1). A diversion assembly is installed on the inner side of the front end of the upper denitrification filter tank (1).

4. A denitrification deep bed filter according to claim 3, characterized in that, The diversion assembly includes an input horizontal pipe (8), which is welded through to the upper side of the internal partition of the upper denitrification filter tank (1). The discharge end of the input horizontal pipe (8) is welded through to a drain cover (81). A triangular diversion plate (7) is installed below the drain cover (81). Screw mounting plates (71) are symmetrically welded to the lower sides of both ends of the triangular diversion plate (7). The two screw mounting plates (71) are respectively installed on the inner wall and the internal partition of the upper denitrification filter tank (1) by screws.

5. A denitrification deep bed filter according to claim 4, characterized in that, The triangular diverter plate (7) has uniform mesh openings on its inner side, and the triangular diverter plate (7) is located above the quartz sand filter media layer (4).

6. A denitrification deep bed filter according to claim 1, characterized in that, The liquid input mechanism includes a lower support plate (53), the lower end of which is welded to the inspection cover plate (6). An upper clamping plate (51) is installed above the lower support plate (53). An external connecting pipe (5) is installed between the lower support plate (53) and the upper clamping plate (51). The upper clamping plate (51) and the lower support plate (53) are locked together by locking screws (52). An input right-angle pipe (55) is welded through the lower front end of the external connecting pipe (5). A connecting sleeve (54) is sleeved around the periphery of the input right-angle pipe (55). The connecting sleeve (54) is welded to the inner side of the inspection cover plate (6).

7. A denitrification deep bed filter according to claim 1, characterized in that, The filter assembly includes a perforated filter element mounting plate (62) and a PP filter element cotton (61). The perforated filter element mounting plate (62) is welded to the rear end area of ​​the upper denitrification filter tank body (1) and the internal partition. The PP filter element cotton (61) is placed on top of the perforated filter element mounting plate (62). Both the perforated filter element mounting plate (62) and the PP filter element cotton (61) are sleeved on the periphery of the input right angle pipe (55).

8. A denitrification deep bed filter according to claim 3, characterized in that, The bottom drain cover (12) is fitted onto the inlet groove (23) of the bottom collection pool seat (2).

9. A denitrification deep bed filter according to claim 3, characterized in that, The upper denitrification filter tank body (1) and the bottom collection tank seat (2) are connected by screws and the connection points are aligned.

10. A denitrification deep bed filter according to claim 4, characterized in that, The drain outlet of the drain cover (81) is located directly above the tip of the triangular diverter plate (7).

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