Modular filter material loading structure and autotrophic denitrification reactor

Abstract

The application discloses a modular filter material loading structure and autotrophic denitrification reactor and relates to the technical field of autotrophic denitrification reactors.The modular filter material loading structure comprises a hard support net which is composed of steel wires supported in a longitudinal and transverse staggered arrangement, a filter material box body in a cylindrical shape is fixedly connected to the periphery of the hard support net, a plurality of connecting hanging holes are formed in the bottom of the filter material box body and close to the side wall of the hard support net, a plurality of adjusting supports which are distributed in a staggered manner are detachably installed at the connecting hanging holes, and autotrophic denitrification fillers are filled in the filter material box body.The modular filter material loading structure is designed in a drawer type, so that the replacement of the fillers is simple and fast, and mechanical excavation or manual cleaning is not needed.The replacement or supplement of the fillers can be easily carried out by rotating out the filler drawer, and the manpower, material resources and time cost are greatly saved.

Description

Technical Field

[0001] This invention relates to the field of autotrophic denitrification reactor technology, specifically to a modular filter media filling structure and an autotrophic denitrification reactor. Background Technology

[0002] This technology is developed based on common denitrification filter media filling methods in the market. Existing methods involve mechanical hoisting of the denitrification filter media, with filling depths generally exceeding 2 meters. Replacing and unloading the filter media after filling is extremely cumbersome, requiring both mechanical and manual excavation. For larger-scale civil engineering filters, mechanical hoisting is more reasonable, but integrated equipment requires consistent filling methods, limiting operability and flexibility. After filling, it is difficult to inspect and analyze the denitrification reaction status of the filter media at different depths. Often, problems accumulate until the effluent quality fails to meet standards, at which point the entire reactor's packing material needs to be excavated and inspected.

[0003] In autotrophic denitrification systems, the packing material is typically loaded in a single operation. A crane lifts the packing bag above the reactor, the bottom zipper is opened, and the packing material is unloaded into the reactor. The loading height is generally 1.5-3 meters. If replacement is needed, mechanical excavation is required to remove the old packing material before hoisting in new material. This process is complex, requires numerous pieces of machinery, and is time-consuming and labor-intensive. Summary of the Invention

[0004] The purpose of this invention is to provide a modular filter media filling structure and an autotrophic denitrification reactor. The modular, unscrewable drawer design makes the replacement of the filter media simple and quick, without the need for mechanical excavation, and provides greater control over the filter media in a certain area, thus solving the above-mentioned technical problems.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A modular filter media filling structure includes a filter media filling structure comprising a rigid support mesh composed of crisscrossing steel wire supports, a cylindrical filter media box fixedly connected to the outer periphery of the rigid support mesh, a plurality of connection hanging holes being provided around the bottom of the filter media box near the side wall of the rigid support mesh, a plurality of staggered adjustment supports being detachably installed at the connection hanging holes, and the filter media box being filled with autotrophic denitrification packing material.

[0007] Preferably, the adjusting supports are arranged in a crisscross pattern and multiple supports are provided between adjacent parallel steel wire supports.

[0008] Preferably, the adjusting supports are staggered with the wire supports.

[0009] Preferably, the adjusting support is a helical spring structure, a rigid iron wire structure, or a combination of a helical spring and a rigid iron wire structure.

[0010] Preferably, the adjustable supports are arranged at intervals above and below the rigid support net.

[0011] An autotrophic denitrification reactor includes the aforementioned modular filter media filling structure, and further includes an inlet tank, a reactor tank, and an outlet tank. The reactor tank includes a lower fixed tank, a side-opening tank fixedly connected to the upper end of the lower fixed tank, an upper fixed tank fixedly connected to the upper end of the side-opening tank, a connecting shaft fixedly installed on the side-opening tank, and an opening / closing side door for closing the side-opening tank rotatably installed at the connecting shaft. A water-stop sealing ring for preventing water leakage is installed on the outer periphery of the opening / closing side door. Multiple filter media filling structures are rotatably installed on the connecting shaft from bottom to top.

[0012] The lower fixed tank is provided with a water inlet on its side end. The lower part of the lower fixed tank is connected to a vent pipe for discharging sewage from the lower fixed tank. The water inlet tank is connected to a water inlet pump through a water inlet pipe. The outlet of the water inlet pump is connected to the water inlet through a pipe. The water inlet pump is used to pump sewage from the water inlet tank into the lower fixed tank.

[0013] The upper fixed tank is connected to a water outlet pipe, and the water outlet end of the water outlet pipe is connected to the water outlet tank.

[0014] Preferably, an inlet nitrate nitrogen detector is installed on the inlet pipe, and an outlet nitrate nitrogen detector is installed on the outlet pipe.

[0015] Preferably, it also includes a backwash water pump and a backwash fan. The lower part of the outlet tank is connected to the interior of the lower fixed tank through a backwash connecting pipe. The backwash connecting pipe is used to pump the clean water in the outlet tank into the lower fixed tank. The backwash fan is used to supply air into the lower fixed tank and to rinse the filter media in the reactor through the backwash connecting pipe.

[0016] Preferably, a filter media support plate is provided at the connection between the lower fixed tank and the side-opening tank. The filter media support plate is evenly provided with a plurality of water distribution holes, and a plurality of support plates and legs for supporting the filter media support plate are fixedly installed at the lower end of the filter media support plate.

[0017] Preferably, the reactor tank is equipped with a plurality of sampling tubes, the number of which is equal to the number of filter media filling structures and located at the upper end of the filter media filling structures, and the sampling tubes are equipped with sampling valves for controlling the on-off state.

[0018] The beneficial effects of this invention are:

[0019] (1) The modular filter media filling structure of the present invention adopts a screw-out drawer design, which makes the replacement of the filler simple and quick, without the need for mechanical excavation or manual cleaning. By screwing out the filler drawer, the filler can be easily replaced or replenished, which greatly saves manpower, material resources and time costs.

[0020] (2) The adjustment supports in the filter media filling structure adopt a spiral spring structure, a hard steel wire structure, or a combination structure, and can be flexibly arranged at the upper or lower end of the rigid support net. By adjusting the number and arrangement of the adjustment supports, the aperture of the packing drawer can be changed to meet the filling requirements of different particle sizes and types of packing, and to achieve layered filling or one-time filling mode.

[0021] (3) By combining the sampling tube to test the water quality of each outlet at a certain height, the denitrification efficiency of the packing material in a certain depth range can be comprehensively analyzed, and abnormal situations such as decreased denitrification efficiency and blockage of the packing material in a certain depth range can be dealt with in a timely manner. The packing structure of each layer of filter material can be unscrewed, which facilitates the observation and sampling inspection of the consumption and particle size changes of the packing material at each depth. It also facilitates the sampling and analysis inspection of the activity and microbial community structure of the autotrophic denitrifying bacteria attached to the packing material at each depth position.

[0022] (4) The reactor tank adopts an upward flow water inlet mode. Combined with the water distribution holes on the filter media support plate, the water inlet can be evenly distributed, improving the denitrification efficiency of the reactor. At the same time, by installing inlet nitrate nitrogen detectors and effluent nitrate nitrogen detectors, the water quality of the reactor inlet and outlet can be monitored in real time, providing important data support for the operation and maintenance of the reactor. Attached Figure Description

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of a modular filter media filling structure according to the present invention;

[0025] Figure 2 This is a schematic diagram of the adjustable support installation structure of a modular filter media filling structure according to the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of an autotrophic denitrification reactor according to the present invention;

[0027] Figure 4 This is a schematic diagram of the reactor tank structure of an autotrophic denitrification reactor according to the present invention;

[0028] Figure 5 This is a schematic diagram of the filter media support plate structure of an autotrophic denitrification reactor according to the present invention.

[0029] In the diagram: 10. Inlet tank; 11. Inlet pipe; 12. Inlet pump; 13. Inlet nitrate nitrogen detector; 20. Reactor tank; 21. Lower fixed tank; 22. Side-opening tank; 23. Upper fixed tank; 24. Connecting shaft; 25. Opening / closing side door; 251. Water-stop sealing ring; 26. Filter media support plate; 261. Water distribution hole; 27. Support plate leg; 28. Inlet; 29. ​​Vent pipe; 30. Filter media filling structure; 31. Rigid support net; 32. Filter media box; 33. Connecting hanging hole; 34. Adjusting support; 40. Outlet tank; 41. Outlet pipe; 42. Outlet nitrate nitrogen detector; 43. Backwash connection pipe; 44. Backwash water pump; 50. Backwash fan; 60. Sampling pipe; 61. Sampling valve. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Please see Figure 1-2As shown, a first aspect of the present invention provides a modular filter media filling structure, including a filter media filling structure 30. The filter media filling structure 30 includes a rigid support net 31 composed of steel wire supports arranged in a crisscross pattern. A cylindrical filter media box 32 is fixedly connected to the outer periphery of the rigid support net 31. A plurality of connection hanging holes 33 are opened around the bottom of the filter media box 32 near the side wall of the rigid support net 31. A plurality of staggered adjustment supports 34 are detachably installed at the connection hanging holes 33. The filter media box 32 is filled with autotrophic denitrification packing material.

[0034] In an optional embodiment, the adjusting supports 34 are arranged in a crisscross pattern and are arranged in multiples between adjacent parallel wire supports.

[0035] It should be noted that the adjusting supports 34 are distributed crisscrossingly between the steel wire supports, which enhances the support force on the packing and prevents short-flow phenomenon caused by uneven accumulation of filter media. At the same time, it facilitates the layered adjustment of pore size.

[0036] In an optional embodiment, the adjusting supports 34 are staggered with the wire supports.

[0037] It should be noted that the adjustment support 34 and the steel wire support are staggered to improve the stability of the internal structure of the filter media layer, reduce the displacement of the packing caused by water flow impact, and can adjust the mesh number of filter media of different specifications to adapt to different specifications of packing.

[0038] In an optional embodiment, the adjusting support 34 is a helical spring structure, a rigid wire structure, or a combination of a helical spring and a rigid wire structure.

[0039] It should be noted that the adjusting support 34 adopts a helical spring, a rigid iron wire or a combination thereof, which combines flexibility and rigidity. It can adapt to changes in the particle size of the filler and provide reliable support, thus extending its service life.

[0040] In an optional embodiment, the adjusting support 34 is arranged vertically at intervals above and below the rigid support net 31.

[0041] It should be noted that the adjusting supports 34 are arranged at the upper and lower ends of the rigid support net 31 or staggered to optimize the aperture adjustment range and meet the filling requirements of different fillers.

[0042] Please see Figure 3-5As shown, a second aspect of the present invention provides an autotrophic denitrification reactor, including the modular filter media filling structure as described above, and also including an inlet tank 10, a reactor tank 20 and an outlet tank 40. The reactor tank 20 includes a lower fixed tank 21, a side-opening tank 22 fixedly connected to the upper end of the lower fixed tank 21, an upper fixed tank 23 fixedly connected to the upper end of the side-opening tank 22, a connecting shaft 24 fixedly provided on the side-opening tank 22, an opening and closing side door 25 for closing the side-opening tank 22 rotatably installed at the connecting shaft 24, and a water-stop sealing ring 251 for preventing water leakage installed on the outer periphery of the opening and closing side door 25. Multiple filter media filling structures 30 are rotatably installed on the connecting shaft 24 from bottom to top.

[0043] The lower fixed tank 21 is provided with a water inlet 28 at its side end. The lower part of the lower fixed tank 21 is connected to a vent pipe 29 for discharging sewage from the lower fixed tank 21. The water inlet tank 10 is connected to a water inlet pump 12 through a water inlet pipe 11. The outlet of the water inlet pump 12 is connected to the water inlet 28 through a pipe. The water inlet pump 12 is used to pump sewage from the water inlet tank 10 into the lower fixed tank 21.

[0044] The upper fixed tank 23 is connected to a water outlet pipe 41, and the water outlet end of the water outlet pipe 41 is connected to the water outlet tank 40.

[0045] In an optional embodiment, an inlet nitrate nitrogen detector 13 is installed on the inlet pipe 11, and an outlet nitrate nitrogen detector 42 is installed on the outlet pipe 41.

[0046] It should be noted that by installing the influent nitrate nitrogen detector 13 and the effluent nitrate nitrogen detector 42 to monitor the denitrification efficiency in real time, the water quality of the reactor's influent and effluent can be monitored in real time, providing important data support for the operation and maintenance of the reactor.

[0047] In an optional embodiment, the system further includes a backwash water pump 44 and a backwash fan 50. The lower part of the outlet tank 40 is connected to the interior of the lower fixed tank 21 via a backwash connecting pipe 43. The backwash water pump 44 is mounted on the backwash connecting pipe 43 to pump clean water from the outlet tank 40 into the lower fixed tank 21. The backwash fan 50 supplies air to the lower fixed tank 21 and flushes the filter media in the reactor through the backwash connecting pipe 43.

[0048] It should be noted that the design of the backwash connection pipe 43 and the backwash fan 50 allows for periodic backwashing of the filter media layer, preventing filter media clogging and contamination, extending the service life of the filter media, and improving the operational stability and processing efficiency of the reactor.

[0049] In an optional embodiment, a filter media support plate 26 is provided at the connection between the lower fixed tank 21 and the side-opening tank 22. The filter media support plate 26 is provided with a plurality of water distribution holes 261 evenly distributed on it. A plurality of support plate legs 27 for supporting the filter media support plate 26 are fixedly installed at the lower end of the filter media support plate 26.

[0050] It should be noted that the water distribution holes 261 of the filter media support plate 26 ensure uniform water flow distribution, and the support plate legs 27 enhance the stability of the support plate and prevent the filter media layer from collapsing.

[0051] In an optional embodiment, a plurality of sampling tubes 60 are installed on the reactor tank 20, the number of sampling tubes 60 being equal to the number of filter media filling structures 30 and located at the upper end of the filter media filling structures 30, and sampling valves 61 for controlling the on / off state are installed on the sampling tubes 60.

[0052] It should be noted that the sampling tube 60 corresponds one-to-one with the filter media filling structure 30, which facilitates sampling and analysis of each layer of packing material to accurately assess microbial activity and denitrification effect.

[0053] The working principle of this invention: The reactor tank 20 is mainly cylindrical. Water enters the reactor tank 20 via an upward flow pattern, entering from the bottom and exiting from the top. A filter media support plate 26 is installed above the bottom inlet 28. The tank above the filter media support plate 26 can be opened to the side for easy replacement of the packing layer. The side door 25 has a water-stop sealing ring 251 around its perimeter to prevent water from seeping out of the reactor tank 20 after closing. The internal packing area is a multi-layer modular filter media filling structure 30. Each modular filter media filling structure 30 is a short cylindrical drawer layer. Each layer of filter media filling structure 30 has a vertical hole on its side through which a longitudinal connecting shaft 24 passes. Each packing layer can rotate around the vertical connecting shaft 24, facilitating the replacement of the autotrophic denitrification packing without the need for complete excavation and replacement as in traditional methods. Each layer of the filter media filling structure 30 layers has a rigid support net 31 formed by staggered steel wires at the bottom. Steel wires provide support in both the warp and weft directions, and adjustable supports 34 can be hung between these rigid supports. The steel wire supports are fixed supports, welded to the filter media box 32, with relatively large spacing, and are the main load-bearing structure of the filter media filling structure 30. The adjustable supports 34 have hooks at both ends, which can be hung at the connection holes 33 of the filter media box 32 to assist the fixed supports in supporting the filter media. The adjustable supports 34 use helical springs, rigid iron wire, or a combination thereof, combining flexibility and rigidity to adapt to changes in the particle size of the filler while providing reliable support. Multiple helical spring supports can be hung between every two steel wire supports to reduce the aperture of the filter media drawer; the aperture is adjustable from 2-40mm. The combined use of fixed supports and detachable adjustable supports 34 meets the basic requirements for filter media support while adding aperture adjustment functionality and convenient filling and unloading capabilities to the filter media filling structure 30. The pore size of the filter media filling structure 30 can be flexibly adjusted by increasing or decreasing the number of adjustment supports 34 to meet the filling requirements of different particle sizes and types of packing materials. If the same type of packing material needs to be filled, the number of adjustment supports 34 in the upper drawer bed can be reduced, and the number of adjustment supports 34 in the bottom bed can be increased. This adjusts the pore size of the filter media filling structure 30 from top to bottom to gradually decrease, facilitating one-time filling of autotrophic denitrification filter media from top to bottom. It also facilitates automatic replenishment to the bottom as the packing material particle size decreases during consumption. If different types of packing materials are filled, the pore size of each packing layer is adjusted according to the packing material particle size for layered filling. Different types of autotrophic denitrification packing materials have different consumption rates; layered filling facilitates timely replenishment of packing materials with faster consumption rates, ensuring the consistency of the packing material composition ratio during the reaction process. For analyzing and comparing the denitrification effect of different packing material compositions, the layered filling mode allows for easy replacement of the type of packing material within the equipment without the need for hoisting and excavation.

[0054] When filling the packing material, open the side door 25 of the tank, unscrew the filter media filling structure 30 outwards, adjust the number of adjustable supports 34 to adjust the aperture of the rigid support mesh 31, and then fill the autotrophic denitrification filter media into the filter media box 32. After filling, unscrew the filter media filling structure 30 inwards to fill the next packing layer. After the packing layer is filled, close the side door 25 of the tank to complete the packing filling. When layered filling is not required, do not hang the adjustable supports 34, and the fixed support spacing is larger. Hoist the packing material from the top of the reactor tank 20 and fill it into the tank in one go. The two filling methods can be selected according to the specific requirements of the project operation. If the packing material needs to be replaced or replenished during the operation of the reactor tank 20, the inlet water of the reactor tank 20 must be closed and the water level in the reactor tank 20 must be emptied to below the filter media support plate 26. Then open the side door 25 of the tank to fill or replace the packing material. When unloading, the spring support is removed, the bed pore size is increased, and the self-aeration denitrification packing can quickly leak out of the filter media filling structure 30, without the need for mechanical excavation.

[0055] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A modular filter media filling structure, characterized in that, The filter media filling structure (30) includes a rigid support net (31) composed of steel wires arranged in a crisscross pattern. A cylindrical filter media box (32) is fixedly connected to the outer periphery of the rigid support net (31). Several connecting holes (33) are opened around the bottom of the filter media box (32) near the side wall of the rigid support net (31). Several staggered adjustment supports (34) are detachably installed at the connecting holes (33). The filter media box (32) is filled with autotrophic denitrification packing material. The adjusting supports (34) are arranged in a crisscross pattern and multiple supports are provided between adjacent parallel steel wire supports; the adjusting supports (34) are arranged in a staggered pattern with the steel wire supports; the adjusting supports (34) are spiral spring structures, hard iron wire structures or a combination of spiral springs and hard iron wire structures; the adjusting supports (34) have hooks at both ends, which can be hung into the connection holes (33) of the filter media box (32) to help fix and support the filter media; Multiple spiral spring supports can be hung between each pair of steel wire supports to reduce the aperture of the filter media drawer; the aperture of the filter media filling structure (30) can be flexibly adjusted by increasing or decreasing the number of supports (34) to meet the filling requirements of different particle sizes and types of fillers.

2. The modular filter media filling structure according to claim 1, characterized in that, The adjustable supports (34) are arranged at intervals above and below the rigid support net (31).

3. An autotrophic denitrification reactor, characterized in that, The system includes the modular filter media filling structure as described in claim 2, and also includes an inlet tank (10), a reactor tank (20), and an outlet tank (40). The reactor tank (20) includes a lower fixed tank (21), a side-opening tank (22) is fixedly connected to the upper end of the lower fixed tank (21), an upper fixed tank (23) is fixedly connected to the upper end of the side-opening tank (22), a connecting shaft (24) is fixedly provided on the side-opening tank (22), and an opening and closing side door (25) for closing the side-opening tank (22) is rotatably installed at the connecting shaft (24). A water-stop sealing ring (251) for preventing water leakage is installed on the outer periphery of the opening and closing side door (25). Multiple filter media filling structures (30) are arranged from bottom to top in the reactor tank (20) and are all rotatably installed on the connecting shaft (24). The lower fixed tank (21) is provided with a water inlet (28) at its side end. The lower part of the lower fixed tank (21) is connected to a vent pipe (29) for discharging sewage from the lower fixed tank (21). The water inlet tank (10) is connected to a water inlet pump (12) through a water inlet pipe (11). The outlet of the water inlet pump (12) is connected to the water inlet (28) through a pipe. The water inlet pump (12) is used to pump sewage from the water inlet tank (10) into the lower fixed tank (21). The upper fixed tank (23) is connected to a water outlet pipe (41), and the water outlet end of the water outlet pipe (41) is connected to the water outlet tank (40).

4. The autotrophic denitrification reactor according to claim 3, characterized in that, An inlet nitrate nitrogen detector (13) is installed on the inlet pipe (11), and an outlet nitrate nitrogen detector (42) is installed on the outlet pipe (41).

5. The autotrophic denitrification reactor according to claim 3, characterized in that, It also includes a backwash water pump (44) and a backwash fan (50). The lower part of the outlet tank (40) is connected to the interior of the lower fixed tank (21) through a backwash connecting pipe (43). The backwash water pump (44) is installed on the backwash connecting pipe (43) to pump the clean water in the outlet tank (40) into the lower fixed tank (21). The backwash fan (50) is used to supply air into the lower fixed tank (21) and to flush the filter material in the reactor through the backwash connecting pipe (43).

6. The autotrophic denitrification reactor according to claim 3, characterized in that, A filter media support plate (26) is provided at the connection between the lower fixed tank (21) and the side opening tank (22). A number of water distribution holes (261) are evenly provided on the filter media support plate (26). A number of support plate legs (27) for supporting the filter media support plate (26) are fixedly installed at the lower end of the filter media support plate (26).

7. The autotrophic denitrification reactor according to claim 3, characterized in that, Multiple sampling tubes (60) are installed on the reactor tank (20). The number of sampling tubes (60) is equal to that of the filter media filling structure (30) and they are located at the upper end of the filter media filling structure (30). Sampling valves (61) for controlling the on / off state are installed on the sampling tubes (60).

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