A pearl shell-based autotrophic denitrification breeding tail water advanced treatment device and method

Abstract

The application discloses a kind of pearl shell-based autotrophic denitrification aquaculture tail water advanced treatment device and method, belong to tail water processing equipment technical field, the device, including, alkalinity adjusting filter cartridge, denitrification nitrogen removal cylinder, first water inlet pipe, second water inlet pipe, drain pipe, disturbing mechanism and drive mechanism, by setting disturbing mechanism, intermediate shaft is driven under drive mechanism and does positive and negative reciprocating rotation, so that rake tooth component produces in situ transverse shear disturbance to filler layer, can effectively break and peel off surface dense filter cake without making the whole bed roll, so that the impurities trapped are loosened and fall off from between filler particles and migrate with water flow to deep part of filler bed, so as to fully utilize the original pollution capacity of middle and lower fillers that has not been utilized, extend single filtration period by several times, and greatly reduce backwashing frequency.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater treatment equipment, specifically, it relates to a device and method for deep treatment of wastewater from pearl shell-based autotrophic denitrification aquaculture. Background Technology

[0002] Sulfur autotrophic denitrification is a highly efficient deep nitrogen removal technology for wastewater. It utilizes sulfur granules as electron donors to reduce nitrates in water to nitrogen gas under the action of specific microorganisms. This process has a low sludge production rate and requires no external organic carbon source, making it particularly suitable for treating wastewater with low carbon-to-nitrogen ratios, such as aquaculture effluent. To replenish the alkalinity consumed in the reaction and maintain system pH stability, sulfur granules are often mixed with alkalinity-slowing materials for use in engineering projects.

[0003] Currently, the common equipment form for applying this technology is the fixed-bed packed tower, which is mainly divided into two types according to the water flow direction: upflow type and downflow type. Among them, downflow type filters are widely used because of their simple structure and convenient management.

[0004] However, regardless of whether an upflow or downflow system is used, the water flow from top to bottom or bottom to top will cause suspended solids in the water and the excessive biofilm that proliferates during the reaction to be preferentially trapped on the surface of the packing material, quickly forming a dense filter cake. Since impurities and sulfur sludge are mainly concentrated on the surface, the packing material in the lower layers of the packing bed cannot be maximized, resulting in a significant reduction in the filtration cycle of the entire packing material. Sulfur particles and pearl shells are hard and brittle materials with sharp edges. After blockage occurs, the huge head loss will cause all the downward water pressure to act on the packing particles, resulting in mutual compression, wear, and even breakage between the particles. The large amount of debris generated will not only consume the packing material but also further aggravate the blockage of the bed. The bed can be expanded and impurities can be flushed out by reverse water flow or air-water combined flushing. However, for the dense and sticky surface crust formed by sulfur sludge and biofilm, backwash water often has difficulty penetrating and can only open a few channels in the bed, resulting in poor flushing effect and high water consumption. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] To address the issues raised in the background section regarding whether upflow or downflow filters are used, where water flows from top to bottom or bottom to top, suspended solids and excessive biofilm proliferating during the reaction process are preferentially trapped on the surface of the filter media, rapidly forming a dense filter cake. Since impurities and sulfur sludge are mainly concentrated on the surface, the lower layers of the filter media cannot be fully utilized, significantly shortening the overall filtration cycle. Furthermore, sulfur particles and pearl shells are angular, hard, and brittle materials; after clogging, the huge head loss applies downward water pressure entirely to the filter media particles, causing them to squeeze, wear, and even break. The resulting debris not only consumes the filter media but also further exacerbates bed clogging. While reverse water flow or combined air-water flushing can expand the bed and flush out impurities, backwash water often struggles to penetrate the dense, sticky surface crust formed by sulfur sludge and biofilm, only creating a few channels within the bed, resulting in poor flushing efficiency and high water consumption. Therefore, this invention employs the following technical solution.

[0007] A pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device includes an alkalinity-adjusting filter cylinder for filtration and a denitrification denitrification cylinder arranged opposite each other. Both the alkalinity-adjusting filter cylinder and the denitrification denitrification cylinder have fixed support legs at their bottoms. A first inlet pipe for conveying raw water is provided at the upper end of the alkalinity-adjusting filter cylinder. The interior of the alkalinity-adjusting filter cylinder is filled with pearl shell substrate for filtering and adjusting the alkalinity of the raw water. A detachable connection is made to the outer wall of the alkalinity-adjusting filter cylinder near the bottom for conveying the filtered raw water to the denitrification denitrification cylinder. The second inlet pipe is filled with sulfur granules for denitrification. The outer wall of the denitrification cylinder is connected to a drain pipe for conveying the denitrified raw water to the outside. The alkalinity adjusting filter cylinder and the denitrification cylinder are equipped with a disturbance mechanism for disturbing the substrate. A drive mechanism is installed on one side of the alkalinity adjusting filter cylinder to drive the disturbance mechanisms on both sides. The disturbance mechanism causes the substrate to rotate slightly inside the alkalinity adjusting filter cylinder and the denitrification cylinder, forcing the substrate to shift, peeling off the upper impurities, and moving it downwards when the raw water enters.

[0008] Preferably, a cleaning mechanism is installed at the upper end of the alkalinity adjusting filter cartridge and the denitrification denitrification cartridge. The cleaning mechanism sprays clean water from above the alkalinity adjusting filter cartridge and the denitrification denitrification cartridge to assist the agitation mechanism in removing impurities.

[0009] Preferably, the agitation mechanism includes an intermediate shaft and a rake tooth assembly. An intermediate shaft is rotatably connected inside the alkalinity adjustment filter cylinder and the denitrification denitrification cylinder. There are multiple rake tooth assemblies arranged vertically. The drive mechanism drives the intermediate shaft to rotate the rake tooth assembly slightly in both forward and reverse directions periodically. The rake tooth assembly agitates the substrate, causing impurities adhering to the gaps in the substrate to move downwards as the raw water enters.

[0010] Preferably, the rake tooth assembly includes a connecting ring body, connecting plates, and flexible columns. The connecting plates are fixedly connected to the outer wall of the connecting ring body in a circumferential array. Multiple flexible columns are fixedly connected to the upper and lower ends of each connecting plate. The connecting ring body is detachably connected to the outer wall of the intermediate shaft. When the drive mechanism drives the intermediate shaft to rotate in both directions, it generates a slight lateral shear force on the base material, causing the base material to move and peel off impurities.

[0011] Preferably, the drive mechanism includes meshing gears, moving plates, guide sleeves, Z-shaped assembly plates, drive screws, servo motors, mounting bases, and gear grooves. The alkalinity adjusting filter cartridges or denitrification denitrification cartridges extend from both ends of the intermediate shaft. The meshing gears are fixedly connected to both ends of the intermediate shaft. The guide sleeves are detachably connected to the upper and lower sides of the area between the alkalinity adjusting filter cartridge and the denitrification denitrification cartridge. The moving plates are slidably connected to the interior of the guide sleeves on both sides. The gear grooves are segmented on the moving plates and mesh with the meshing gears. The gear grooves on the upper moving plate are staggered from those on the lower moving plate. The upper and lower moving plates are respectively located on opposite sides of the centerline of the intermediate shaft. The Z-shaped assembly plate connects to the moving plates on both sides. One end is fixedly connected, the mounting base is detachably connected to the outer wall of the alkalinity adjusting filter cylinder, the servo motor is detachably connected to the upper end of the mounting base, one end of the drive screw is detachably connected to the rotating end of the servo motor, and the other end of the drive screw is rotatably connected to the outer wall of the alkalinity adjusting filter cylinder. The drive screw passes through the Z-shaped mounting plate and is threadedly connected to the Z-shaped mounting plate. The rotation of the servo motor drives the drive screw to rotate, causing the drive screw to move the moving plate laterally. When the upper tooth groove meshes with the upper meshing gear, the lower tooth groove disengages from the lower meshing gear, causing the intermediate shaft to rotate to one side. As it moves, the upper tooth groove disengages, and the lower tooth groove meshes, causing the intermediate shaft to rotate to the other side.

[0012] Preferably, the alkalinity adjusting filter cartridge and the denitrification denitrification cartridge are detachably connected to the top of their inner sides. The water distributor inside the alkalinity adjusting filter cartridge is connected to and communicates with the first inlet pipe, and the water distributor inside the denitrification denitrification cartridge is connected to and communicates with the second inlet pipe.

[0013] Preferably, a dividing plate is detachably connected to the alkalinity adjusting filter cartridge located below the second water inlet pipe. The internal space of the alkalinity adjusting filter cartridge above the dividing plate is a filter chamber, and the internal space of the alkalinity adjusting filter cartridge below the dividing plate is a sedimentation chamber. The filter chamber is filled with pearl shell substrate, and the sedimentation chamber is filled with large pebbles.

[0014] Preferably, the bottom of the alkalinity adjusting filter cartridge and the denitrification denitrification cartridge is detachably connected to a drain pipe.

[0015] Preferably, the cleaning mechanism includes a clean water pipe and a pressure relief valve. The pressure relief valve is detachably connected to the upper end of the alkalinity adjustment filter cylinder and the denitrification denitrification cylinder. The clean water pipe is connected and communicates with the pressure relief valves on both sides, and the pressure relief valve is connected and communicates with the water distributor.

[0016] This invention also discloses a method for deep treatment of wastewater from pearl shell-based autotrophic denitrification aquaculture, using the aforementioned pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device. The method includes the following steps:

[0017] S1. Raw water enters the alkalinity adjustment filter cylinder filled with pearl shell substrate through the first water inlet pipe, and flows from top to bottom through the substrate layer to filter and adjust the alkalinity.

[0018] S2. During the filtration process, the drive mechanism is activated to drive the disturbance mechanism to make the intermediate shaft rotate slightly in both directions periodically inside the alkalinity adjustment filter cylinder. The multiple rake tooth components arranged vertically on the intermediate shaft generate lateral shear disturbance on the substrate, forcing the substrate to shift, peeling off the impurities trapped in the upper layer, and causing the peeled impurities to move downward under the continuous flow of raw water.

[0019] S3. Water treated by the alkalinity adjustment filter cartridge enters the denitrification denitrification cartridge filled with sulfur particles through the second inlet pipe for sulfur autotrophic denitrification treatment.

[0020] S4. The denitrified water is discharged out through the drain pipe.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. In this invention, by setting up a disturbance mechanism, the central shaft of which rotates back and forth under the drive mechanism, the rake tooth assembly generates in-situ lateral shear disturbance on the packing layer. This effectively breaks up and peels off the dense filter cake on the surface without causing the entire bed to roll over. This allows the trapped impurities to loosen and fall off from between the packing particles and migrate with the water flow to the depth of the packing bed. This fully utilizes the previously unused dirt-holding capacity of the middle and lower layers of packing, extending the single filtration cycle by several times and significantly reducing the frequency of backwashing. Since the disturbance only causes a small displacement of the packing layer rather than violent rolling, combined with the buffering effect of the flexible column on the rake tooth assembly, it avoids strong compression and collision between the hard and brittle pearl shells and sulfur particles, reducing the risk of packing breakage and wear to a negligible level. This fundamentally prevents secondary clogging caused by particle breakage and debris filling the pores.

[0023] 2. In this invention, the interior of the cylinder is divided into a filtration chamber and a sedimentation chamber by a perforated plate. This allows impurities that are disturbed, peeled off, and migrate downwards to pass through the perforated plate and enter the sedimentation chamber at the bottom, where they are intercepted. This effectively prevents impurities from returning to the filtration chamber under water flow fluctuations and causing secondary pollution to the packing material, further extending the service life and maintenance cycle of the pearl shell substrate.

[0024] 3. The cleaning mechanism injects clean water from top to bottom for forward sewage discharge. Since the impurities have been pre-stripped and settled, the clean water can smoothly flush out the high-concentration impurities from the bottom sewage pipe along the original filtration path. This completely overcomes the shortcomings of traditional backwashing water flow, which is difficult to penetrate the dense crust on the surface and can only form a few channels, resulting in low flushing efficiency and significantly saving flushing water consumption. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device according to the present invention;

[0026] Figure 2 This is a front view schematic diagram of the tailwater deep treatment device in this invention;

[0027] Figure 3 This is a side view of the tailwater deep treatment device in this invention.

[0028] Figure 4 This is a cross-sectional view of the tailwater deep treatment device in this invention.

[0029] Figure 5 This is a schematic diagram of the raw water flow path in the tailwater deep treatment device of the present invention;

[0030] Figure 6 This is a schematic diagram of the disturbance mechanism structure in this invention;

[0031] Figure 7 In this invention Figure 6 Enlarged structural diagram of section B;

[0032] Figure 8 This is a schematic diagram of the drive mechanism structure in this invention;

[0033] Figure 9 In this invention Figure 8 Enlarged structural diagram of section C;

[0034] Figure 10 In this invention Figure 1 Enlarged structural diagram of section A.

[0035] The correspondence between the labels and component names in the attached figures is as follows:

[0036] 100. Alkalinity adjusting filter cartridge; 101. Denitrification denitrification cartridge; 102. Support leg; 103. First inlet pipe; 104. Second inlet pipe; 105. Drain pipe; 106. Dividing orifice plate; 107. Filtration chamber; 108. Sedimentation chamber; 109. Water distributor;

[0037] 200. Disturbance mechanism; 201. Intermediate shaft; 202. Rake tooth assembly; 203. Connecting ring; 204. Connecting plate; 205. Flexible column;

[0038] 300. Drive mechanism; 301. Meshing gear; 302. Moving plate; 303. Guide sleeve; 304. Z-shaped assembly plate; 305. Drive screw; 306. Servo motor; 307. Mounting base; 308. Gear groove;

[0039] 400. Cleaning mechanism; 401. Clean water pipe; 402. Sewage pipe; 403. Pressure relief valve. Detailed Implementation

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments. The present invention provides the following embodiments.

[0043] like Figure 1 , Figure 2 , Figure 3 as well as Figure 5The diagram shown is a schematic representation of a pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device according to a preferred embodiment of the present invention. This embodiment includes an alkalinity-adjusting filter cylinder 100 and a denitrification denitrification cylinder 101 arranged opposite each other. Support legs 102 are fixedly connected to the bottom of both the alkalinity-adjusting filter cylinder 100 and the denitrification denitrification cylinder 101. A first inlet pipe 103 for conveying raw water is provided at the upper end of the alkalinity-adjusting filter cylinder 100. The interior of the alkalinity-adjusting filter cylinder 100 is filled with pearl shell substrate material for filtering and adjusting the alkalinity of the raw water. The outer wall near the bottom of the cylinder 100 is detachably connected to a second inlet pipe 104 for conveying the filtered raw water to the denitrification cylinder 101. The interior of the denitrification cylinder 101 is filled with sulfur particles for denitrification. The outer wall of the denitrification cylinder 101 is connected to a drain pipe 105 for conveying the denitrified raw water to the outside. In this embodiment, the raw water enters the interior of the alkalinity adjustment filter cylinder 100 through the first inlet pipe 103 to contact the pearl shell substrate, where the raw water is filtered and its alkalinity is adjusted. The water treated by the alkalinity adjustment filter cylinder 100 enters the interior of the denitrification cylinder 101 through the second inlet pipe 104 for denitrification, and is finally discharged through the drain pipe 105.

[0044] Because impurities remain on the upper layer of pearl shell substrate during water filtration, the lower layer cannot fully perform its filtration and alkalinity adjustment functions, reducing the service life of the pearl shell substrate and requiring frequent rinsing. To remove the upper impurities from the pearl shell substrate and allow them to flow downwards, a specific structure can be adopted as follows: Figure 3 as well as Figure 4 In the illustrated embodiment, the alkalinity adjusting filter cartridge 100 and the denitrification denitrification cartridge 101 are internally equipped with a disturbance mechanism 200 for agitating the substrate. A drive mechanism 300 is installed on one side of the alkalinity adjusting filter cartridge 100 to drive the disturbance mechanisms 200 on both sides. The disturbance mechanism 200 causes the substrate to rotate slightly inside the alkalinity adjusting filter cartridge 100 and the denitrification denitrification cartridge 101, forcing the substrate to shift, stripping away upper impurities, and allowing it to move downwards when raw water enters. The disturbance mechanism 200 includes a middle... The shaft 201 and the rake tooth assembly 202 are rotatably connected to the interior of the alkalinity adjustment filter cylinder 100 and the denitrification denitrification cylinder 101. There are multiple rake tooth assemblies 202 arranged vertically. The drive mechanism 300 drives the intermediate shaft 201 to drive the rake tooth assembly 202 to rotate slightly in both forward and reverse directions periodically. In this embodiment, the rake tooth assembly 202 disturbs the substrate, so that the impurities adhering to the gaps in the substrate move downward with the entry of raw water, avoiding blockage of the upper substrate and reducing the treatment efficiency of the raw water.

[0045] The specific structure of the rake tooth assembly 202 can be as follows: Figure 6 as well as Figure 7 In the embodiment shown, the rake tooth assembly 202 includes a connecting ring 203, a connecting plate 204, and flexible columns 205. The connecting plates 204 are fixedly connected to the outer wall of the connecting ring 203 in a circumferential array. Multiple flexible columns 205 are fixedly connected to the upper and lower ends of each connecting plate 204. The connecting ring 203 is detachably connected to the outer wall of the intermediate shaft 201. In this embodiment, through the connecting plates 204 and the flexible columns 205, when the driving mechanism 300 drives the intermediate shaft 201 to rotate in both directions, a slight lateral shear force is generated on the base material, driving the base material to move and peel off impurities. Through the soft characteristics of the flexible columns 205, damage to the base material can be avoided during disturbance.

[0046] In order to drive the intermediate shaft 201 to rotate slightly in both directions, the specific structure can be as follows: Figure 7 as well as Figure 8In the embodiment shown, the drive mechanism 300 includes a meshing gear 301, a moving plate 302, a guide sleeve 303, a Z-shaped assembly plate 304, a drive screw 305, a servo motor 306, a mounting base 307, and a toothed groove 308. Both ends of the intermediate shaft 201 extend through the alkalinity adjusting filter cartridge 100 or the denitrification denitrification cartridge 101. The meshing gear 301 is fixedly connected to both ends of the intermediate shaft 201. The guide sleeve 303 is detachably connected to the upper and lower sides of the area between the alkalinity adjusting filter cartridge 101 and the denitrification denitrification cartridge 101. The movable plate 302 is slidably connected to the inside of the guide sleeves 303 on both sides. The toothed grooves 308 are segmented on the movable plate 302 and mesh with the meshing gears 301. The toothed grooves 308 on the upper movable plate 302 are staggered from those on the lower movable plate 302. The upper and lower movable plates 302 are respectively located on opposite sides of the center line of the intermediate shaft 201. The Z-shaped mounting plate 304 is fixedly connected to one end of the two movable plates 302. The mounting base 307 is detachable from the outer wall of the alkalinity adjusting filter cartridge 100. The servo motor 306 is detachably connected to the upper end of the mounting base 307. One end of the drive screw 305 is detachably connected to the rotating end of the servo motor 306, and the other end of the drive screw 305 is rotatably connected to the outer wall of the alkalinity adjusting filter cartridge 100. The drive screw 305 passes through the Z-shaped mounting plate 304 and is threadedly connected to the Z-shaped mounting plate 304. In this embodiment, the rotation of the servo motor 306 drives the drive screw 305 to rotate, thereby causing the drive screw 305 to move the moving plate 302 laterally. The toothed grooves 308 on the moving plate 302 are staggered from those on the lower moving plate 302. When the upper toothed groove 308 meshes with the upper meshing gear 301, the lower toothed groove 308 disengages from the lower meshing gear 301, causing the intermediate shaft 201 to rotate to one side. As the movement continues, the upper toothed groove 308 disengages, and the lower toothed groove 308 meshes, causing the intermediate shaft 201 to rotate to the other side. This enables the intermediate shaft 201 to rotate in a small range in both directions, which, in conjunction with the disturbance mechanism 200, disturbs the base material.

[0047] To ensure that the incoming water can evenly contact the internal base material, the specific structure can be as follows: Figure 4 In the embodiment shown, a water distributor 109 is detachably connected to the top inner side of the alkalinity adjusting filter cartridge 100 and the denitrification denitrification cartridge 101. The water distributor 109 inside the alkalinity adjusting filter cartridge 100 is connected and communicates with the first inlet pipe 103, and the water distributor 109 inside the denitrification denitrification cartridge 101 is connected and communicates with the second inlet pipe 104. In this embodiment, the water distributor 109 enables the raw water to come into contact with more substrate, thereby improving the treatment efficiency.

[0048] Even after impurities are removed and move downwards through the raw water, they can still easily clog the second inlet pipe 104. To further extend the service life of the pearl shell substrate inside the alkalinity adjusting filter cartridge 100, the specific structure can be as follows: Figure 4 In the embodiment shown, a perforated plate 106 is detachably connected to the alkalinity adjusting filter cylinder 100 located below the second water inlet pipe 104. The internal space of the alkalinity adjusting filter cylinder 100 above the perforated plate 106 is a filter chamber 107, and the internal space of the alkalinity adjusting filter cylinder 100 below the perforated plate 106 is a sedimentation chamber 108. The filter chamber 107 is filled with pearl shell substrate, and the sedimentation chamber 108 is filled with large pebbles. In this embodiment, when impurities are stripped and move downward through the raw water, the impurities enter the sedimentation chamber 108 through the perforated plate 106 and are intercepted by the large pebble layer, preventing them from returning to the filter chamber 107, thereby extending the service life of the pearl shell substrate.

[0049] For prolonged use, it is necessary to remove impurities from the alkalinity adjustment filter cartridge 100 and the denitrification removal cartridge 101. A suitable structure could be adopted as follows: Figure 1 as well as Figure 10 In the embodiment shown, a cleaning mechanism 400 is installed at the upper end of the alkalinity adjusting filter cartridge 100 and the denitrification denitrification cartridge 101. The cleaning mechanism 400 sprays clean water outward from the water distributor 109, and the auxiliary agitation mechanism 200 removes impurities. A drain pipe 402 is detachably connected to the bottom of the alkalinity adjusting filter cartridge 100 and the denitrification denitrification cartridge 101. The cleaning mechanism 400 includes a clean water pipe 401 and a pressure relief valve 403, which is detachably connected to the upper part of the alkalinity adjusting filter cartridge 100 and the denitrification denitrification cartridge 101. At one end, the clean water pipe 401 is connected to and communicates with the pressure relief valves 403 on both sides. The pressure relief valves 403 are connected to and communicate with the water distributor 109. In this embodiment, the cleaning mechanism 400 delivers clean water into the interior of the alkalinity adjustment filter cylinder 100 and the denitrification denitrification cylinder 101, and discharges it outward from the drain pipe 402 carrying impurities. By setting the pressure relief valve 403, the cleaning mechanism 400 opens after reaching the preset pressure, so that the clean water is discharged from the water distributor 109 with a certain impact force, which can both assist in the removal of impurities and avoid damage to the base material.

[0050] This embodiment also discloses a method for deep treatment of wastewater from pearl shell-based autotrophic denitrification aquaculture. Using the aforementioned pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device, the method includes the following steps:

[0051] S1. Raw water enters the alkalinity adjustment filter cylinder 100 filled with pearl shell substrate through the first water inlet pipe 103, and flows from top to bottom through the substrate layer to filter and adjust the alkalinity.

[0052] S2. During the filtration process, the drive mechanism 300 is activated to drive the disturbance mechanism 200 to move, so that the intermediate shaft 201 rotates slightly in both directions periodically inside the alkalinity adjustment filter cylinder 100. The multiple rake tooth components 202 arranged vertically on the intermediate shaft 201 generate lateral shear disturbance on the substrate, forcing the substrate to shift, peeling off the impurities trapped in the upper layer, and causing the peeled impurities to move downward under the continuous flow of raw water.

[0053] S3. Water treated by alkalinity adjustment filter cartridge 100 enters denitrification denitrification cartridge 101 filled with sulfur particles through second water inlet pipe 104 for sulfur autotrophic denitrification treatment.

[0054] S4. The denitrified water is discharged out through drain pipe 105.

[0055] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted herein.

Claims

1. A pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device, comprising an alkalinity-adjusting filter cylinder (100) for filtration and a denitrification denitrification cylinder (101) for nitrogen removal, arranged opposite each other on the left and right sides. The bottoms of both the alkalinity-adjusting filter cylinder (100) and the denitrification denitrification cylinder (101) are fixedly connected to support legs (102). The upper end of the alkalinity-adjusting filter cylinder (100) is provided with a first inlet pipe (103) for conveying raw water. The interior of the alkalinity-adjusting filter cylinder (100) is filled with pearl shell substrate for filtering and adjusting the alkalinity of the raw water. A second inlet pipe (104) is detachably connected to the outer wall near the bottom of the alkalinity-adjusting filter cylinder (100) for conveying the filtered raw water to the denitrification filter cylinder (101). The interior of the denitrification filter cylinder (101) is filled with sulfur granules for denitrification. A drain pipe (105) is connected to the outer wall of the denitrification filter cylinder (101) for conveying the denitrified raw water to the outside. The characteristic feature is that… The alkalinity adjusting filter cartridge (100) and the denitrification denitrification cartridge (101) are equipped with a disturbance mechanism (200) for agitating the substrate. A drive mechanism (300) for driving the disturbance mechanism (200) on both sides is installed on one side of the alkalinity adjusting filter cartridge (100). The disturbance mechanism (200) causes the substrate to rotate slightly inside the alkalinity adjusting filter cartridge (100) and the denitrification denitrification cartridge (101), forcing the substrate to shift, stripping off the upper impurities, and moving it downwards when the raw water enters.

2. The pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device according to claim 1, characterized in that, A cleaning mechanism (400) is installed at the upper end of the alkalinity adjusting filter (100) and the denitrification denitrification cylinder (101). The cleaning mechanism (400) sprays clean water from above the alkalinity adjusting filter (100) and the denitrification denitrification cylinder (101) and assists the disturbance mechanism (200) in removing impurities.

3. The pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device according to claim 1, characterized in that, The disturbance mechanism (200) includes an intermediate shaft (201) and a rake tooth assembly (202). An intermediate shaft (201) is rotatably connected inside the alkalinity adjustment filter cylinder (100) and the denitrification denitrification cylinder (101). There are multiple rake tooth assemblies (202) arranged vertically. The drive mechanism (300) drives the intermediate shaft (201) to drive the rake tooth assembly (202) to rotate slightly in both forward and reverse directions periodically. The rake tooth assembly (202) disturbs the substrate, causing the impurities adhering to the gaps in the substrate to move downwards as the raw water enters.

4. The pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device according to claim 3, characterized in that, The rake tooth assembly (202) includes a connecting ring (203), a connecting plate (204), and flexible columns (205). The connecting plates (204) are fixedly connected to the outer wall of the connecting ring (203) in a circumferential array. Multiple flexible columns (205) are fixedly connected to the upper and lower ends of each connecting plate (204). The connecting ring (203) is detachably connected to the outer wall of the intermediate shaft (201). When the drive mechanism (300) drives the intermediate shaft (201) to rotate back and forth, it generates a slight lateral shear force on the base material, driving the base material to move and peel off impurities.

5. The pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device according to claim 1, characterized in that, The drive mechanism (300) includes a meshing gear (301), a moving plate (302), a guide sleeve (303), a Z-shaped mounting plate (304), a drive screw (305), a servo motor (306), a mounting base (307), and a toothed groove (308). Both ends of the intermediate shaft (201) extend through the alkalinity adjusting filter cartridge (100) or the denitrification denitrification cartridge (101). The meshing gear (301) is fixedly connected to both ends of the intermediate shaft (201), and the guide sleeve (303) is detachably connected to the alkalinity adjusting filter cartridge (100). On the upper and lower sides of the area between the denitrification denitrification cylinder (101), the movable plate (302) is slidably connected to the inside of the guide sleeves (303) on both sides. The toothed groove (308) is segmented on the movable plate (302) and meshes with the meshing gear (301). The toothed groove (308) on the upper movable plate (302) is staggered from the toothed groove (308) on the lower movable plate (302). The upper movable plate (302) and the lower movable plate (302) are respectively set on opposite sides of the center line of the intermediate shaft (201). Z-shaped assembly The mounting plate (304) is fixedly connected to one end of the two movable plates (302). The mounting base (307) is detachably connected to the outer wall of the alkalinity adjusting filter cylinder (100). The servo motor (306) is detachably connected to the upper end of the mounting base (307). One end of the drive screw (305) is detachably connected to the rotating end of the servo motor (306). The other end of the drive screw (305) is rotatably connected to the outer wall of the alkalinity adjusting filter cylinder (100). The drive screw (305) passes through the Z-shaped mounting plate (304) and is connected to the Z-shaped mounting plate. The plate (304) is threaded, and the servo motor (306) rotates to drive the drive screw (305) to rotate, so that the drive screw (305) drives the moving plate (302) to move laterally. When the upper tooth groove (308) meshes with the upper meshing gear (301), the lower tooth groove (308) disengages from the lower meshing gear (301), causing the intermediate shaft (201) to rotate to one side. As it moves, the upper tooth groove (308) disengages, and the lower tooth groove (308) meshes, causing the intermediate shaft (201) to rotate to the other side.

6. The pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device according to claim 2, characterized in that, The alkalinity adjusting filter cartridge (100) and the denitrification denitrification cartridge (101) are detachably connected to the top of the inner side of the water distributor (109). The water distributor (109) inside the alkalinity adjusting filter cartridge (100) is connected to the first inlet pipe (103) and communicates with it. The water distributor (109) inside the denitrification denitrification cartridge (101) is connected to the second inlet pipe (104) and communicates with it.

7. The pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device according to claim 1, characterized in that, The alkalinity adjusting filter tube (100) is detachably connected to a dividing orifice plate (106) located below the second water inlet pipe (104). The internal space of the alkalinity adjusting filter tube (100) above the dividing orifice plate (106) is a filter chamber (107), and the internal space of the alkalinity adjusting filter tube (100) below the dividing orifice plate (106) is a sedimentation chamber (108). The filter chamber (107) is filled with pearl shell substrate, and the sedimentation chamber (108) is filled with large pebbles.

8. The pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device according to claim 2, characterized in that, The bottom of the alkalinity adjusting filter cartridge (100) and the denitrification denitrification cartridge (101) is detachably connected to a drain pipe (402).

9. The pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device according to claim 6, characterized in that, The cleaning mechanism (400) includes a clean water pipe (401) and a pressure relief valve (403). The pressure relief valve (403) is detachably connected to the upper end of the alkalinity adjustment filter cartridge (100) and the denitrification denitrification cartridge (101). The clean water pipe (401) is connected and communicates with the pressure relief valves (403) on both sides. The pressure relief valves (403) are connected and communicate with the water distributor (109).

10. A method for deep treatment of wastewater from pearl shell-based autotrophic denitrification aquaculture, using the pearl shell-based autotrophic denitrification aquaculture wastewater deep treatment device as described in claim 1, characterized in that... The method includes the following steps: S1. Raw water enters the alkalinity adjustment filter cylinder (100) filled with pearl shell substrate through the first water inlet pipe (103), and flows from top to bottom through the substrate layer to filter and adjust the alkalinity. S2. During the filtration process, the drive mechanism (300) is activated to drive the disturbance mechanism (200) to move, so that the intermediate shaft (201) rotates slightly in the forward and reverse directions periodically inside the alkalinity adjustment filter cylinder (100). The multiple rake tooth components (202) arranged vertically on the intermediate shaft (201) generate lateral shear disturbance on the substrate, forcing the substrate to shift, peeling off the impurities trapped in the upper layer, and causing the peeled impurities to move downward under the continuous flow of raw water. S3. Water treated by alkalinity adjustment filter cartridge (100) enters the denitrification denitrification cartridge (101) filled with sulfur particles through the second water inlet pipe (104) for sulfur autotrophic denitrification treatment. S4. The denitrified water is discharged out through the drain pipe (105).

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