Sulfur autotrophic denitrification filter tank

Abstract

The utility model belongs to the technical field of anaerobic nitrification of sewage, and relates to a sulfur autotrophic denitrification filter tank. Aiming at the technical problems that a stirring device in a sulfur autotrophic denitrification filter tank in the prior art cannot keep full contact between wastewater and a biological membrane by stirring in a starting stage and a nitrification process without hindering the formation of the biological membrane, and residues in equipment cannot be removed in a cleaning process, the utility model provides a stirring device for a sulfur autotrophic denitrification filter tank. The sulfur autotrophic denitrification filter tank comprises a filter tank body provided with a water inlet and a water outlet, a shaft rod is arranged in the filter tank body, a round rod is arranged on the shaft rod, the sulfur autotrophic denitrification filter tank further comprises a shell arranged on the shaft rod, the round rod and a spring are arranged in the shell, and the bottom edge, close to the shaft rod, of the shell is connected with the round rod through the spring. Under the action of centrifugal force and traction force of the spring, the round rod is far away from or close to the shaft rod and enters or leaves the shell, and different stirring amplitudes can be provided in different sewage treatment periods so as to meet different stirring requirements and realize full stirring.

Description

Technical Field

[0001] This utility model belongs to the field of anaerobic nitrification technology for wastewater, specifically, it relates to a sulfur autotrophic denitrification filter. Background Technology

[0002] Sulfate autotrophic denitrification is a denitrification technology that uses reduced sulfides as electron donors to reduce nitrate nitrogen to nitrogen gas in an anaerobic environment. This technology does not require the addition of organic carbon sources, thus offering advantages such as low cost and low sludge production, making it a green and low-carbon wastewater denitrification technology. Commonly used sulfur sources in sulfur autotrophic denitrification include sodium sulfide, sodium thiosulfate, and elemental sulfur. Under the action of microorganisms, these sulfur sources are ultimately converted into sulfates through a series of reactions, while simultaneously reducing nitrate nitrogen to nitrogen gas. The application of sulfur autotrophic denitrification technology in wastewater treatment can replace traditional heterotrophic denitrification processes, and it is particularly suitable for wastewater with a low C / N ratio. In practical applications, sulfur autotrophic denitrification filters can be used as part of a deep denitrification process, and some wastewater treatment plants have already adopted this type of filter to replace traditional heterotrophic denitrification filters. Specifically, a sulfur autotrophic denitrification filter is a special type of biological filter that uses sulfides as electron donors to reduce nitrate nitrogen to nitrogen gas in an anaerobic environment, thereby achieving denitrification. The structure of such a filter may also include a device for adding a sulfur source, as well as possible special designs to optimize the sulfur autotrophic denitrification process.

[0003] In wastewater treatment, agitation is generally necessary, as it facilitates mixing, mass transfer, and reaction. For sulfur autotrophic denitrification filters, agitation may not be essential, as these filters rely on microbial activity on the biofilm for nitrogen removal. However, filter operation may involve some agitation or mixing to ensure adequate contact between the wastewater and the filter media surface, thereby promoting biofilm formation and the nitrogen removal process. In some cases, such as during filter cleaning, agitation or water flow may be required to remove scale residues within the equipment. During normal operation, however, sulfur autotrophic denitrification filters typically rely on natural convection and biochemical reactions on the biofilm rather than mechanical agitation. If agitation is required in a sulfur autotrophic denitrification filter, it may be for specific purposes, such as: promoting biofilm formation during startup; removing residues during cleaning; or, in some designs, maintaining adequate contact between the wastewater and the biofilm.

[0004] The Chinese utility model patent authorization announcement number is CN221344213U, the application date is December 6, 2023, and the title is: "A Sulfur Autotrophic Denitrification Filter". The disclosed structure includes a filter body, a drive motor mounted on its right side by screws, and a rotating shaft mounted on the output end of the drive motor. It also includes a water wheel and a second cleaning scraper. Hollow mounting frames are mounted inside three discharge pipes by screws. Rotating rods are mounted on the inside of each of the three mounting frames via bearings, and a water wheel is mounted above each of the three rotating rods. During discharge, the water wheel converts the potential energy of the water flow into mechanical energy, which then drives the threaded mounting rods of the rotating rods to rotate the second cleaning scraper, preventing impurities from adhering to the inner wall of the discharge pipes and causing blockage. The equally spaced installation of the stirring structure in this design "facilitates the stable reaction of the filter body in the later stages," but because the length of the stirring structure is fixed, it cannot provide a more thorough stirring effect. In existing technologies, many patents have disclosed how to promote biofilm formation during the start-up phase. However, some designs require stirring to maintain sufficient contact between wastewater and biofilm, which may require stirring structures of different lengths. There are relatively few disclosures of such technologies.

[0005] In particular, biofilm startup is a complex process that requires a suitable environment, such as appropriate agitation amplitude, during the filter startup phase to promote microbial attachment and growth. Typically, this stage requires a low agitation amplitude to avoid damaging the delicate biofilm. On the other hand, in the later stages of wastewater treatment, a higher agitation amplitude may be needed to maintain sufficient contact between the wastewater and the biofilm to enhance mass transfer.

[0006] Since the two stages have drastically different requirements for stirring speed, traditional stirring devices are difficult to meet these requirements. If the stirring rod is designed to be too long, even at a lower speed, it can still create a large amplitude, affecting the start-up of the biofilm. If the stirring rod is designed to be too short, even if the speed is increased, it cannot maintain sufficient contact between the wastewater and the biofilm. Summary of the Invention

[0007] 1. Problems to be solved

[0008] To address the technical challenges of existing sulfur autotrophic denitrification filters where the stirring devices cannot simultaneously meet the requirements of maintaining sufficient contact between wastewater and biofilm during startup and nitrification without hindering biofilm formation, as well as removing residues during cleaning, this application provides a sulfur autotrophic denitrification filter that can provide different stirring amplitudes at different stages of wastewater treatment to adapt to different stirring needs and achieve sufficient stirring.

[0009] 2. Technical solution

[0010] To solve the above problems, the technical solution provided by this utility model is as follows:

[0011] A sulfur autotrophic denitrification filter includes a filter body with an inlet and an outlet, and a shaft is provided in the filter body;

[0012] It also includes a housing disposed on the shaft; the round rod and the spring are disposed in the housing, and the housing near the bottom edge of the shaft and the round rod are connected by the spring;

[0013] When the shaft rotates, under the action of centrifugal force and spring traction, the round rod moves away from or towards the shaft, and the round rod enters or leaves the housing.

[0014] Furthermore, the wall of the housing is provided with a groove, and a slider is provided in the groove. The slider can move along the axial direction of the housing in the groove; the slider and one end edge of the round rod are connected.

[0015] Furthermore, there are multiple slots, symmetrically arranged along the wall of the housing.

[0016] Furthermore, a sealing ring is fixedly connected to one side of the housing; the inner wall of the sealing ring penetrates the round rod, and the round rod is movably connected to the sealing ring.

[0017] Furthermore, a baffle is provided at the end of the round rod away from the shaft.

[0018] Furthermore, the diameter of the baffle is larger than the diameter of the round rod.

[0019] Furthermore, the baffle is made of metal.

[0020] Furthermore, a bearing is embedded on one side of the filter body, the bearing is fixedly connected to the filter body, and the shaft is provided on the inner side wall of the bearing.

[0021] Furthermore, there are multiple circular rods.

[0022] Furthermore, it also includes a drive motor, the output shaft of which is connected to the shaft.

[0023] 3. Beneficial effects

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] This utility model discloses a sulfur autotrophic denitrification filter. The filter body contains a shaft with a circular rod attached. Even with a relatively short length, the circular rod can be thrown out by centrifugal force when the shaft reaches a certain rotational speed. At a constant speed, this provides a stable stirring effect. The length of the circular rod varies depending on the rotational speed, providing different stirring effects to suit various scenarios. Furthermore, by controlling the rotational speed and utilizing the traction force of a spring, the rod can be periodically returned. This reciprocating motion generates a pulsed stirring effect in the wastewater, providing a greater stirring amplitude than with a conventionally longer circular rod. This stirring method also generates more turbulence in the liquid because the throwing and pulling motion of the circular rod creates irregular flow patterns. It is suitable for scenarios requiring strong stirring, such as "removing residues from equipment during cleaning" mentioned in the background of this application. In contrast, existing technologies rigidly connect the circular rod to the shaft with a fixed length, lacking additional oscillation or elastic movement, resulting in a relatively uniform flow pattern, which is clearly unsuitable for cleaning scenarios within equipment. On the other hand, in this application, when the shaft speed is low, the round rod will not be thrown out by centrifugal force and turbulence will not be formed. Moreover, the round rod of this application can be shorter than that designed in the prior art. At the same speed, it forms a lower stirring amplitude than the prior art. This stirring method helps to promote the formation of biofilm in the start-up stage because gentle stirring can promote full contact between wastewater and biofilm without causing too much damage to biofilm.

[0026] The sulfur autotrophic denitrification filter of this application also includes a shell mounted on a shaft. A round rod and a spring are disposed within the shell. The bottom edge of the shell near the shaft and the round rod are connected by the spring. When the shaft rotates, under the action of centrifugal force and spring traction, the round rod moves away from or towards the shaft, entering or leaving the shell. The shell reduces direct contact between the spring and the wastewater material, thereby reducing wear on the spring or the round rod. The shell can limit the range of motion of the round rod, ensuring that the stirring action takes place within a specific area, increasing the stirring efficiency, and contributing to more uniform stirring of the materials in the filter. The shell can also serve as a structural component, improving the stability of the entire stirring system. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the sulfur autotrophic denitrification filter structure in Example 1;

[0028] Figure 2 This is a cross-sectional schematic diagram of the sulfur autotrophic denitrification filter structure in Example 1;

[0029] Figure 3 for Figure 2 A partially enlarged schematic diagram of the medium-circular rod structure.

[0030] In the picture:

[0031] 1. Drive motor; 2. Inlet; 3. Solenoid valve; 4. Filter body; 5. Baffle; 6. Round rod; 7. Outlet; 8. Shaft; 9. Bearing; 10. Spring; 11. Housing; 12. Groove; 13. Slider; 14. Sealing ring. Detailed Implementation

[0032] The present invention will be further described below with reference to specific embodiments.

[0033] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] Example 1

[0035] The sulfur autotrophic denitrification filter in this embodiment, such as Figure 1-3 As shown, the filter body 4 includes an inlet 2 and an outlet 7. Both the inlet 2 and outlet 7 are equipped with solenoid valves 3, which control the opening and closing of the inlet 2 and outlet 7. The filter body 4 has a shaft 8, on which round rods 6 are mounted. Multiple round rods 6 are typically provided; in this embodiment, eight round rods 6 are staggered along the shaft 8. Multiple round rods 6 increase the surface area in contact with wastewater, thereby improving stirring efficiency and the contact opportunities between wastewater and the biofilm. During the start-up phase, multiple round rods 6 can more evenly promote biofilm formation because they can more comprehensively cover the bottom and sides of the filter, reducing the problem of insufficient stirring amplitude caused by the round rods 6. Compared to the case with only two stirring rods, this embodiment does not require a large stirring force to cover the stirring needs of the entire filter. Multiple round rods 6 can generate more complex flow patterns, helping to avoid dead zones and improve the mixing uniformity of the wastewater. At the same time, multiple round rods 6 provide more adjustment possibilities; their positions and angles can be adjusted as needed to optimize the stirring effect. If one of the round rods 6 malfunctions, the other round rods 6 can still continue to operate, improving the reliability of the entire mixing system. The design of multiple round rods 6 also makes it easier to replace or maintain individual round rods.

[0036] This embodiment also includes a housing 11 mounted on the shaft 8. A round rod 6 and a spring 10 are disposed within the housing 11. The bottom edge of the housing 11 near the shaft 8 and the round rod 6 are connected by the spring 10. When the shaft 8 rotates, under the action of centrifugal force and the traction force of the spring 10, the round rod 6 moves away from or towards the shaft 8, entering or leaving the housing 11. The housing 11 is welded to the shaft 8, preventing wastewater from entering the housing 11 through its bottom and thus preventing corrosion of the spring to some extent. The wall of the housing 11 in this embodiment has a groove 12, in which a slider 13 is provided. The slider 13 can move axially along the housing 11 within the groove 12, and is connected to one edge of the round rod 6. Generally, there are multiple grooves 12, symmetrically arranged along the wall of the housing 11. In this embodiment, there are two grooves 12. Each housing 11 has a long groove 12 on its left and right sides, and a slider 13 is slidably connected to the inner wall of the long groove 12. A round rod 6 is welded and fixed between the two sliders 13. The design of the groove 12 and slider 13 reduces direct contact between the round rod 6 and the housing 11, thereby reducing wear and extending the service life of the round rod 6. Multiple grooves are symmetrically arranged along the wall of the housing 11, which helps to evenly distribute the load and reduce damage caused by uneven stress. The slider 13 moves within the groove 12, a design that provides additional stability. The design of the groove 12 and slider 13 helps to reduce vibration during the rotation of the shaft 8, as the slider 13 can move within the groove 12 to absorb some of the vibration. The design of the groove 12 allows the round rod 6 to enter or exit the housing 11 more effectively, thereby improving stirring efficiency and uniformity. The design of the groove 12 and slider 13 makes the overall structure more compact, saving space while providing the required functionality.

[0037] In this embodiment, a sealing ring 14 is fixedly connected to one side of the housing 11. The inner wall of the sealing ring 14 penetrates the round rod 6, and the round rod 6 is movably connected to the sealing ring 14. Due to the function of the sealing ring 14, larger particles are prevented from entering the interior of the housing 11 through gaps, thereby protecting the round rod 6 and the spring 10 from wear or blockage, and preventing wastewater from corroding the spring 10. By preventing particle ingress, the maintenance requirements and costs of the equipment are reduced. Good sealing performance improves the reliability of the entire system and ensures the stability of the stirring process. The movable connection between the round rod 6 and the sealing ring 14 allows for a certain range of axial movement, which helps to cope with vibration and thermal expansion during the extension and contraction of the round rod 6.

[0038] In this embodiment, a baffle 5 is provided at the end of the round rod 6 away from the shaft 8. The baffle 5 is made of metal, and its diameter is larger than that of the round rod 6. The baffle 5 can affect the flow pattern generated by stirring, which helps to improve the stirring effect and make the stirring more uniform.

[0039] A bearing 9 is embedded on one side of the filter body 4. The bearing 9 is fixedly connected to the filter body 4. A shaft 8 is provided on the inner side wall of the bearing 9. The bearing 9 is used to reduce the resistance to the rotation of the shaft 8.

[0040] This embodiment also includes a drive motor 1, the output shaft of which is connected to a shaft 8. The drive motor 1 provides precise speed control, allowing the operator to adjust the stirring speed as needed to optimize biofilm formation and denitrification. The motor drive facilitates easy start-up, stopping, and speed adjustment, improving operational convenience. The motor drive system can easily interface with the control system for automated control, enhancing the overall intelligence of the filtration system. Furthermore, the motor drive design allows for easy integration with other filtration and treatment equipment, enabling unified control of the entire system.

[0041] The working principle of this device is as follows:

[0042] Water intake stage: First, open the solenoid valve 3, and wastewater enters the filter body 4 through the inlet 2. When the wastewater reaches the specified level, start the drive motor 1, thereby driving the shaft 8 to rotate.

[0043] Initial stirring: In the initial stage of wastewater treatment, excessive stirring amplitude is not required to promote the attachment and growth of microorganisms. At this time, the round rod 6 in the shell 11 will not be thrown out, so as to achieve a low stirring amplitude and avoid damaging the fragile biofilm.

[0044] Continuous stirring: As wastewater treatment progresses, effective contact between the wastewater and the biofilm can be maintained according to different needs. At this stage, it may be necessary to slightly increase the stirring amplitude to enhance mass transfer and thus promote wastewater treatment. Therefore, the rotation speed can be adjusted so that the circular rod 6 extends a fixed length due to centrifugal force, providing a stable stirring effect.

[0045] Effluent stage: The treated wastewater is discharged through the set outlet 7. At this time, the solenoid valve at outlet 7 needs to be opened.

[0046] Cleaning Stage: To clean the interior of the filter tank, the stirring speed of the drive motor 1 is increased. The housing 11 rotates within the filter body 4, and the rotation of the shaft 8 generates centrifugal force, causing the round rod 6 to slide out of the housing 11. As the rotational speed of the drive motor 1 changes, the round rod 6 extends or retracts accordingly. This action helps create turbulence during the cleaning process, effectively removing residues from the equipment. A sealing ring 14 is fixedly connected to one side of the housing 11, and the inner wall of the sealing ring 14 penetrates the round rod 6, with the round rod 6 movably connected to the sealing ring 14. The sealing ring 14 serves a sealing function, preventing larger particles from entering through gaps.

Claims

1. A sulfur autotrophic denitrification filter, comprising a filter body (4) with an inlet (2) and an outlet (7), characterized in that: The filter body (4) is provided with a shaft (8); a round rod (6) is provided on the shaft (8); It also includes a housing (11) disposed on the shaft (8); the round rod (6) and the spring (10) are disposed in the housing (11), and the housing (11) is connected to the round rod (6) near the bottom edge of the shaft (8) by the spring (10); When the shaft (8) rotates, under the action of centrifugal force and the traction force of the spring (10), the round rod (6) moves away from or closer to the shaft (8), and the round rod (6) enters or leaves the housing (11).

2. The sulfur autotrophic denitrification filter according to claim 1, characterized in that: The wall of the housing (11) is provided with a groove (12), and a slider (13) is provided in the groove (12). The slider (13) can move along the axial direction of the housing (11) in the groove (12); the slider (13) is connected to one end edge of the round rod (6).

3. The sulfur autotrophic denitrification filter according to claim 2, characterized in that: There are multiple grooves (12), which are symmetrically arranged along the wall of the shell (11).

4. The sulfur autotrophic denitrification filter according to claim 2, characterized in that: A sealing ring (14) is fixedly connected to one side of the housing (11); the inner wall of the sealing ring (14) passes through the round rod (6), and the round rod (6) is movably connected to the sealing ring (14).

5. A sulfur autotrophic denitrification filter according to claim 4, characterized in that: The end of the round rod (6) away from the shaft (8) is provided with a baffle (5).

6. The sulfur autotrophic denitrification filter according to claim 5, characterized in that: The diameter of the baffle (5) is larger than the diameter of the round rod (6).

7. A sulfur-autotrophic denitrification filter according to claim 6, characterized in that: The baffle (5) is made of metal.

8. A sulfur autotrophic denitrification filter according to claim 7, characterized in that: A bearing (9) is embedded on one side of the filter body (4), and the bearing (9) is fixedly connected to the filter body (4). The shaft (8) is provided on the inner side wall of the bearing (9).

9. A sulfur autotrophic denitrification filter according to any one of claims 1-8, characterized in that: There are multiple round rods (6).

10. A sulfur autotrophic denitrification filter according to claim 9, characterized in that: It also includes a drive motor (1), the output shaft of which is connected to the shaft (8).

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