Autotrophic denitrification device

Abstract

This invention relates to the field of wastewater treatment technology, and more particularly to an autotrophic denitrification device, comprising a base plate, an electrical and mechanical equipment area on one side of the base plate, and two adjacent, alternately operating filter tanks on the other side of the electrical and mechanical equipment area. Each filter tank contains, from bottom to top, a filter cap support plate, a gravel support layer, a packing layer, and a clear water layer. An inlet area is separated from the filter tank by an inlet area on the lower side of the filter cap support plate; a water distribution structure; a backwashing assembly; a bubble generating assembly; and a cleaning assembly. This invention achieves continuous inflow and outflow of water through the two alternately operating filter tanks, avoiding the interruption of wastewater treatment operations due to the failure of a single filter tank, thus improving wastewater treatment efficiency. It effectively treats wastewater by utilizing the sulfur-autotrophic denitrifying microorganisms contained in the packing layer, preventing filter media clogging and ensuring the normal operation of the filter tanks; and effectively solves the problem of sludge accumulation at the bottom of the filter tank.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an autotrophic denitrification device. Background Technology

[0002] Currently, when urban sewage in my country is treated and directly used as a supplementary source for surface water, it still contains a certain amount of pollutants such as nitrogen and phosphorus, and the content is difficult to meet the surface water quality standards. When directly discharged into natural water bodies, it is easy to cause eutrophication and other harms. Moreover, the organic matter content in the secondary biological effluent of sewage treatment plants is low, making it difficult to meet the C / N ratio requirements of the denitrification process (in autotrophic denitrification, the ideal C / N ratio is usually between 2:1 and 4:1, which means that each unit of nitrate (nitrogen source) requires 2 to 4 units of carbon dioxide as a carbon source to ensure that denitrification can proceed efficiently). Adding additional organic carbon sources will increase treatment costs and cause problems with organic matter residue. Therefore, deep total nitrogen removal treatment of secondary biological effluent has become one of the challenges faced in the upgrading and transformation of sewage treatment plants.

[0003] Traditional heterotrophic denitrification filters often use ceramsite (or sea sand) as the filter layer, requiring the addition of an external carbon source. They cannot perform autotrophic denitrification. In addition, the filters currently in use are generally single-operation systems. Once a malfunction occurs, the treatment system will stop, and in severe cases, the wastewater treatment process will be interrupted, affecting the continuity of wastewater treatment.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an autotrophic denitrification device.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an autotrophic denitrification device, including a base plate, an electrical and mechanical equipment area is provided on one side of the base plate, and two adjacent and alternately operating filter tanks are provided on one side of the electrical and mechanical equipment area. Each filter tank is provided with a filter cap support plate, a gravel support layer, a packing layer and a clear water layer in sequence from bottom to top. An inlet area is provided on the lower side of the filter cap support plate and separated in the filter tank.

[0007] A water distribution structure is installed in the water inlet area to homogenize the wastewater before it enters the filter tank;

[0008] The backwash assembly includes an air distribution pipe for introducing backwash gas into the water inlet area and a backwash water pipe for introducing backwash gas into the water inlet area. The backwash water pipe consists of a main pipe and several branch pipes equidistantly distributed on the main pipe. Several water outlet micro-holes for spraying water flow are uniformly arranged on the branch pipes.

[0009] A bubble generating component is disposed outside the branch pipe and connected to the backwash water pipe to make the bubbles evenly dispersed into the water flow.

[0010] A cleaning component, located at the bottom of the filter tank, is used to clean the sludge accumulated in the inlet area and output it externally.

[0011] Furthermore, the bubble generating assembly includes a first external cylinder covering the outside of the branch pipe. The first external cylinder is provided with a converging-diverging section. The throat of the converging-diverging section is provided with a negative pressure port for generating local negative pressure. The air distribution pipe can communicate with the interior of the converging-diverging section or the first external cylinder.

[0012] Furthermore, the branch pipe is rotatably connected to the main pipe, and a circular plate is sleeved on one end of the branch pipe corresponding to the main pipe. One end of the first external cylinder is provided with an annular groove adapted to and rotatably connected to the circular plate. The outer edge of the circular plate extends into the annular groove and is clearance-fitted with the annular groove. In the autotrophic denitrification reaction, each of the water outlet microholes opened on the branch pipe is arranged downwards inside the first external cylinder.

[0013] The circular plate is provided with a spiral guide plate that rotates inside the first external cylinder. The spiral guide plate is located outside the branch pipe. One end of the spiral guide plate is provided with a bracket. The bracket is provided with blades that drive the spiral guide plate to rotate. A rotating rod is detachably provided on the end face of the bracket away from the branch pipe. The outer end of the rotating rod is provided with a detachable and pull-out end plate on the filter tank. The end of the rotating rod corresponding to the end plate passes through the end plate and extends to the outside.

[0014] Furthermore, the bottom surface of the annular groove is vertically provided with a water outlet channel, and the inlet of the water outlet channel is located on the side of the inner cavity of the first external cylinder.

[0015] A spray hole is provided on the branch pipe at the inlet position corresponding to the water outlet channel.

[0016] Furthermore, the cleaning assembly includes a support frame fixed to the lower end of the end plate and a horizontal scraper fixed on the support frame and away from one end of the end plate.

[0017] Moving the end plate along the width of the filter tank causes the lower contact surface of the horizontal scraper to rub against the bottom of the filter tank, causing the sludge accumulated at the bottom of the filter tank to be collected and gathered towards the end plate.

[0018] Furthermore, the cleaning assembly also includes a second external cylinder disposed on the lower side of the end plate and communicating with the bottom of the filter tank, and an auger adapted to be rotatably disposed in the second external cylinder and used to spirally transport the sludge collected on the side of the end plate to the outside. The bottom of the filter tank is provided with an inclined surface on one side corresponding to the auger, and an opening is provided on the second external cylinder at the lower position corresponding to the inclined surface.

[0019] The opening is used to quickly guide and collect sludge into the second external cylinder under the friction cleaning of the horizontal scraper.

[0020] Furthermore, one end of the auger is provided with a transmission unit that moves with the horizontal scraper and drives the auger to rotate in coordination;

[0021] The transmission unit includes a worm gear sleeved on one end of the auger and ball screws and guide rods adapted to be installed at both ends of the horizontal scraper. The ball screws are provided with worms at the corresponding ends to drive the worm gear to rotate and mesh with the worm gear.

[0022] Furthermore, a water collection block is provided on the top surface of each of the filter tanks and above the clear water layer. A backwash drain pipe connected to the outside is provided inside the water collection block, and an outlet pipe for discharging filtered water is provided between the two backwash drain pipes.

[0023] Furthermore, both of the filter tanks are connected to one side by a vent pipe;

[0024] The vent pipe is used to discharge the gases produced during the denitrification reaction.

[0025] Furthermore, the electrical and mechanical equipment area includes a power distribution control cabinet for power supply, a backwash fan connected to the air distribution pipe, a backwash water pump connected to the backwash water pipe, and supporting auxiliary equipment.

[0026] The air inlet of the backwash blower can be connected to the air outlet of the vent pipe to collect the gas produced by denitrification, which is then re-entered into the filter tank by the suction action of the backwash blower.

[0027] Compared with existing technologies, the present invention has the following advantages: The present invention achieves continuous influent and effluent by using two alternately operating filter tanks, avoiding the shutdown of wastewater treatment operations due to the failure of a single filter tank, thus improving wastewater treatment efficiency; furthermore, through the filter cap support plate, gravel support layer, packing layer, and water distribution structure, during the process of water entering from the bottom of the filter tank, the water sequentially passes through the filter cap support plate, gravel support layer, and packing layer, reacting with the wastewater and utilizing the sulfur-autotrophic denitrifying microorganisms contained in the packing layer to effectively treat the wastewater; and furthermore, the inclusion of a bubble generating component enables negative pressure air intake. The gas is injected into the water flow, allowing the air bubbles to disperse evenly and better contact with the wastewater, thus enhancing the dissolution effect of the gas. In conjunction with the backwashing components, the filter bed is backwashed regularly. The combined air and water backwashing method effectively removes trapped material and aging biofilm from the surface of the filter media, preventing filter media blockage and ensuring the normal operation of the filter bed. The design of the cleaning components effectively solves the problem of sludge accumulation at the bottom of the filter bed, further avoiding filter media blockage, reducing the workload that the denitrification reaction in the filter bed can withstand, and effectively improving the wastewater treatment capacity and discharge efficiency. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0029] Figure 1 This is a perspective view of the overall structure of an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the overall rear planar structure according to an embodiment of the present invention;

[0031] Figure 3 This is a perspective view of a partial cross-section of an embodiment of the present invention.

[0032] Figure 4 This is a front view schematic diagram of a partial cross-section of an embodiment of the present invention;

[0033] Figure 5 This is a side plan view of a partial cross-section of an embodiment of the present invention.

[0034] Figure 6 This is a top view schematic diagram of the overall structure of an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the sequential connection of the spiral guide plate, support, and rotating rod inside the first external cylinder in one embodiment of the present invention;

[0036] Figure 8This is a perspective view of the combination of the bubble generating component and the cleaning component in one embodiment of the present invention;

[0037] Figure 9 This is a rear view schematic diagram of the combination of the bubble generating component and the cleaning component in one embodiment of the present invention;

[0038] Figure 10 This is a side view of the combined bubble generating component and cleaning component in one embodiment of the present invention.

[0039] Figure 11 This is a top view of the internal structure of a filter tank in one state according to an embodiment of the present invention;

[0040] Figure 12 This is a top view of another state of the filter tank in one embodiment of the present invention.

[0041] In the diagram: 1. Base plate; 2. Electrical and mechanical equipment area; 3. Filter tank; 31. Filter cap support plate; 32. Gravel support layer; 33. Packing layer; 34. Clear water layer; 4. Water distribution structure; 5. Backwashing assembly; 51. Air distribution pipe; 52. Backwash water pipe; 521. Branch pipe; 5211. Circular plate; 6. Bubble generating assembly; 61. First external cylinder; 611. Negative pressure port; 62. Annular groove; 6 3. Spiral guide plate; 64. Support; 65. Blade; 66. Rotating rod; 67. End plate; 7. Cleaning assembly; 71. Support frame; 72. Horizontal scraper; 73. Second external cylinder; 74. Screwdriver; 75. Transmission unit; 751. Worm gear; 752. Ball screw; 753. Guide rod; 754. Worm; 8. Water collection block; 9. Backwash drain pipe; 10. Water outlet pipe; 11. Drain pipe. Detailed Implementation

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. 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.

[0043] like Figure 1-12 As shown, the present invention discloses an autotrophic denitrification device, including a base plate 1. An electrical and mechanical equipment area 2 is provided on one side of the base plate 1. Two adjacent and alternately operating filter tanks 3 are provided on one side of the electrical and mechanical equipment area 2. Each filter tank 3 is provided with a filter cap support plate 31, a gravel support layer 32, a packing layer 33 and a clear water layer 34 arranged sequentially from bottom to top. An inlet area is provided on the lower side of the filter cap support plate 31 and separated within the filter tank 3.

[0044] The water distribution structure 4 is set in the water inlet area to homogenize the sewage before it enters the filter tank 3;

[0045] The backwash assembly 5 includes an air distribution pipe 51 for introducing backwash gas into the water inlet area and a backwash water pipe 52 for introducing backwash gas into the water inlet area. The backwash water pipe 52 consists of a main pipe and several branch pipes 521 equidistantly distributed on the main pipe. Several water outlet micro-holes for spraying water flow are uniformly arranged on the branch pipes 521.

[0046] A bubble generating component 6 is disposed outside the branch pipe 521 and connected to the backwash water pipe 52 to make the bubbles evenly dispersed into the water flow.

[0047] The cleaning component 7 is located at the bottom of the filter tank 3 and is used to clean the sludge accumulated in the inlet area and output it externally.

[0048] In practice, by arranging the electrical and mechanical equipment area 2 on the base plate 1 and installing two filter tanks 3 on one side of the electrical and mechanical equipment area 2, the two operate alternately, achieving continuous water inflow and outflow, avoiding the sewage treatment operation from stopping due to the failure of a single filter tank 3, and improving the sewage treatment efficiency.

[0049] Furthermore, through the filter cap support plate 31, gravel support layer 32, packing layer 33, and clear water layer 34 installed sequentially from bottom to top within the filter tank 3, wastewater enters the separated inlet area of ​​the filter tank 3 through the water distribution structure 4 installed throughout the filter tank 3. From bottom to top, it passes through the filter cap support plate 31 and gravel support layer 32, and comes into contact with the packing layer 33. When the wastewater passes through the packing layer 33, it will be converted into inorganic carbon (such as CO2, HCO3) under the action of sulfur autotrophic denitrifying microorganisms contained in the packing layer 33. 3- CO3 2- (etc.) as carbon source, with reduced inorganic substances (S, S) 2- H2, S2O3 2- Fe, Fe 2+ NH 4+ (etc.) as electron donors for reducing nitrate nitrogen, reducing nitrate / nitrite nitrogen in nitrate nitrogen wastewater lacking organic carbon sources to nitrogen gas, thereby achieving denitrification. The whole process does not require the addition of external carbon sources, realizing autotrophic denitrification reaction, and finally the water is discharged from the top of filter 3.

[0050] It should be noted that during the above contact reaction process, the reaction temperature should be controlled within a suitable range, usually 15-37℃, and the total nitrogen content of the influent should generally be mainly nitrate nitrogen. The influent flow rate and concentration should be controlled to avoid exceeding the treatment capacity of the filter media. At the same time, the dissolved oxygen concentration of the influent should be kept low, generally below 1 mg / L, the pH value should be maintained at around 7-8, and the water temperature should be above 15℃.

[0051] The air distribution pipe 51 and backwash water pipe 52, which connect the inside and outside of the corresponding filter tank 3, are periodically activated. The corresponding backwash blower and backwash water pump connected to the outside of the air distribution pipe 51 and backwash water pipe 52 can backwash the filter tank 3 to remove the trapped material and aging biofilm on the surface of the filter media, prevent the filter media from clogging, and ensure the normal operation of the filter tank 3. During the operation of the backwash component 5, the bubble generating component 6 outside the branch pipe 521 included on the backwash water pipe 52 works in conjunction with the backwash component 5 to draw in gas under negative pressure and inject it into the water flow. This allows the bubbles to be evenly dispersed in the water flow, impacting the suspended solids in the sewage and making better contact with the sewage, thus enhancing the dissolution effect of the gas and effectively helping to remove suspended solids in the sewage. In addition, the cleaning component 7 installed at the bottom of the filter tank 3 can regularly clean the sludge accumulated at the bottom of the filter tank 3 after the backwash operation, reducing the workload that the denitrification reaction in the filter tank 3 can withstand and effectively improving the sewage treatment capacity and discharge efficiency.

[0052] It should be noted that backwashing usually adopts a combined air and water backwashing method. Air washing can be performed first, followed by water washing, or air and water can be performed simultaneously. The air washing flow rate is generally 90 m / h, and the water washing flow rate is about 15 m / h.

[0053] Preferably, the water distribution structure 4 has four outlet ports arranged at the corresponding corners at the bottom of the filter tank 3, which can ensure the homogenization of sewage inflow.

[0054] The branch pipes 521 formed on the backwash water pipe 52 are arranged at equal intervals at the bottom of the filter tank 3, and each branch pipe 521 is uniformly processed with several water outlet micro holes, which can uniformly discharge water and evenly disperse bubbles into the water flow under the action of the bubble generating component 6.

[0055] It should be noted that the filter bed 3 uses sulfur-based or sulfur-iron-based composite packing material. During the operation of the sulfur autotrophic denitrification filter bed, it is necessary to regularly monitor the effluent quality of the filter bed 3, check whether the equipment and pipelines are intact, and check whether there are problems such as blockage or phosphate deposition in the filter media, and carry out maintenance and treatment in a timely manner.

[0056] In one embodiment, the bubble generating assembly 6 includes a first external cylinder 61 covering the outside of the branch pipe 521. The first external cylinder 61 has a tapered-expanding section, and the throat of the tapered-expanding section has a negative pressure port 611 for generating local negative pressure. The air distribution pipe 51 can communicate with the tapered-expanding section or the interior of the first external cylinder 61. This design, through the tapered-expanding section integrally formed on the first external cylinder 61, utilizes the Venturi effect to uniformly disperse bubbles into the water flow through local negative pressure, thereby impacting suspended solids in the wastewater and enhancing the gas dissolution effect.

[0057] It should be noted that the throat (narrowest section) of the tapered-expanding section is machined with a negative pressure port 611.

[0058] In one embodiment, the branch pipe 521 is rotatably connected to the main pipe, and a circular plate 5211 is sleeved on one end of the branch pipe 521 corresponding to one end of the main pipe. One end of the first external cylinder 61 is provided with an annular groove 62 adapted to and rotatably connected to the circular plate 5211. The outer edge of the circular plate 5211 extends into the annular groove 62 and is clearance-fitted with the annular groove 62. In the autotrophic denitrification reaction, each of the water outlet microholes opened on the branch pipe 521 is arranged downward in the first external cylinder 61.

[0059] The circular plate 5211 is provided with a spiral guide plate 63 that rotates inside the first external cylinder 61. The spiral guide plate 63 is located outside the branch pipe 521. One end of the spiral guide plate 63 is provided with a bracket 64. The bracket 64 is provided with blades 65 that drive the spiral guide plate 63 to rotate. A rotating rod 66 is detachably provided on the end face of the bracket 64 away from the branch pipe 521. The outer end of the rotating rod 66 is provided with a detachable and pull-out end plate 67 on the filter tank 3. The end of the rotating rod 66 corresponding to the end plate 67 passes through the end plate 67 and extends to the outside. This design, through the circular plate 5211 fitted on the outside of the branch pipe 521 near the main pipe end, and the annular groove 62 machined at one end of the first external cylinder 61, will rotate the rotating rod 66 during the autotrophic denitrification reaction. Through the sequentially connected bracket 64 and spiral guide plate 63, the branch pipe 521, which is rotated and installed on the main pipe, will be flipped until the direction of each outlet micro-hole on the branch pipe 521 is downward. This avoids the blockage of the outlet micro-hole by suspended solids in the wastewater during the autotrophic denitrification reaction, and effectively ensures the normal operation of the subsequent backwashing function.

[0060] The blades 65, which are installed opposite each other at the port of the branch pipe 521, will rotate when the branch pipe 521 sprays water. This will cause the spiral guide plate 63 welded to the blades 65 to rotate. Since one end of the spiral guide plate 63 is welded and fixed to the circular plate 5211, and the circular plate 5211 is sleeved on the outside of the branch pipe 521, when the spiral guide plate 63 rotates, it will cause the branch pipe 521 to flip. This will cause the water outlet micro-holes on the branch pipe 521 to face upwards. With the cooperation of the gradually narrowing and gradually expanding sections, the bubbles are evenly dispersed into the water flow, which improves the gas dissolution effect.

[0061] It should be noted that the windward tilt angle of blade 65 is 20°-30° to optimize kinetic energy conversion efficiency. The water flow generated at the port of branch pipe 521 impacts the root of blade 65 (1 / 3 of the distance from the axis), maximizing torque by utilizing the leverage effect.

[0062] It should be noted that the outer edge of the circular plate 5211 extends into the annular groove 62 for fitting and connection. When sludge is deposited, it will further block and restrict the rotation of the branch pipe 521, always keeping the water outlet micro-holes on the branch pipe 521 facing downwards, thus avoiding sludge clogging the water outlet micro-holes. At the same time, during the later sludge removal operation, the outer edge of the plate extending into the annular groove 62 increases the impact area of ​​the water flow, making the operation more convenient.

[0063] In one embodiment, the bottom surface of the annular groove 62 is provided with a water outlet channel, and the inlet of the water outlet channel is located on the side of the inner cavity of the first external cylinder 61.

[0064] The branch pipe 521 is equipped with spray holes at the inlet positions corresponding to the water outlet channels. This design allows for the vertical distribution of water outlet channels machined into the bottom surface of the annular groove 62, and the inlet located on the side of the inner cavity of the first outer cylinder 61. During backwashing, a backwash pump pumps water through the branch pipe 521. A portion of this water flows through the micro-outlet holes and spray holes at the corresponding inlet positions on the branch pipe 521, sequentially removing sludge from the inner wall of the first outer cylinder 61. Simultaneously, through the water outlet channels, the sludge at the location of the circular plate 5211 is suspended and lifted by the spraying action of the water flow. Once the circular plate 5211 loses its external restraint, it continues to rotate under the rotation of the blades 65, driving the branch pipe 521 connected by the spiral guide plate 63 to rotate, causing the micro-outlet holes on the branch pipe 521 to spray water vertically upwards, continuing the removal of suspended solids from the subsequent wastewater.

[0065] It should be noted that if the sludge is not completely attached to the circular plate 5211 during backwashing, the branch pipe 521 can be directly flipped by the torsional elasticity of the torsion spring, so that the spray direction of the water outlet micro-hole is vertically upward. With the cooperation of the gradually narrowing and gradually expanding sections, the bubbles are evenly dispersed into the water flow, which improves the gas dissolution effect and achieves a good removal effect on suspended solids in sewage.

[0066] In one embodiment, the cleaning component 7 includes a support frame 71 fixed to the lower end of the end plate 67 and a horizontal scraper 72 fixed on the support frame 71 and away from the end plate 67.

[0067] Moving the end plate 67 along the width of the filter tank 3 causes the lower contact surface of the horizontal scraper 72 to rub against the bottom of the filter tank 3, resulting in the sludge accumulated at the bottom of the filter tank 3 being collected and gathered towards the end plate 67. This design, through the support frame 71 welded to the lower end of the end plate 67 and the horizontal scraper 72 fixed to the support frame 71 at the end away from the end plate 67 with screws, effectively rubs against the bottom surface of the horizontal scraper 72 as the end plate 67 moves outward, causing the sludge accumulated at the bottom of the filter tank 3 to be collected and gathered towards the outside of the end plate 67.

[0068] It should be noted that a cleaning brush is installed at the bottom of the horizontal scraper 72.

[0069] In one embodiment, the cleaning assembly 7 further includes a second external cylinder 73 disposed on the lower side of the end plate 67 and communicating with the bottom of the filter tank 3, and an auger 74 adapted to rotatably disposed in the second external cylinder 73 and used to spirally transport the sludge collected on the side of the end plate 67 to the outside. The bottom of the filter tank 3 is provided with an inclined surface on one side corresponding to the auger 74, and an opening is provided on the second external cylinder 73 at the lower position corresponding to the inclined surface.

[0070] The opening is used to quickly guide and collect sludge into the second external cylinder 73 under the friction cleaning of the horizontal scraper 72. This design, through the second external cylinder 73 installed on the lower side of the end plate 67 and communicating with the inside of the filter tank 3, and the auger 74 used and rotating inside the second external cylinder 73, allows the sludge to be aggregated and placed into the second external cylinder 73, and then discharged to the outside under the spiral conveying of the auger 74, providing a convenient channel for external sludge discharge.

[0071] Furthermore, the sludge is conveniently drained through the opening machined on one side of the second external cylinder 73 and the inclined surface machined on the bottom of the filter tank 3.

[0072] It should be noted that a sludge outlet pipe is installed at one end of the second external cylinder 73, which communicates with the inner cavity of the second external cylinder 73, and a solenoid valve for controlling the opening and closing is installed on the sludge outlet pipe.

[0073] In one embodiment, one end of the auger 74 is provided with a transmission unit 75 that moves with the horizontal scraper 72 and drives the auger 74 to rotate in coordination;

[0074] The transmission unit 75 includes a worm gear 751 sleeved on one end of the auger 74 and ball screws 752 and guide rods 753 adapted to be disposed at both ends of the horizontal scraper 72. The ball screw 752 has a worm 754 at the corresponding end that drives the worm gear 751 to rotate and meshes with the worm gear 751. This design utilizes a ball screw 752, which is fitted and installed in a slot at one end of the horizontal scraper 72. The ball screw 752 typically consists of a screw, balls, and a ball guide rail. The balls in the ball screw 752 roll within the threaded track, thus enabling the conversion between linear motion of the horizontal scraper 72 and rotation of the ball screw 752. A guide rod 753, slidably installed in a slot at the other end of the horizontal scraper 72, allows for linear motion. A worm gear 754 welded to the end of the ball screw 752 and a fixed worm wheel 751 are fitted onto one end of the auger 74. These two components mesh together, with the worm gear 754 driving the worm wheel 751 to rotate, which in turn drives the auger 74 to rotate, achieving the external output of the collected sludge.

[0075] It should be noted that the ball screw 752 and the worm gear 754 are installed with the same diameter.

[0076] It should be noted that the distance (pitch) between adjacent thread peaks on the outside of the ball screw 752 is typically 1mm-10mm or more, and the greater the pitch, the greater the linear displacement. Pitch is the distance between two adjacent thread peaks, affecting the linear distance traveled by the ball screw 752 per revolution. The larger the pitch of the ball screw 752, the greater the linear displacement per unit rotation.

[0077] In one embodiment, a water collection block 8 is provided on the top surface of a single filter tank 3 and above the clear water layer 34. A backwash drain pipe 9 connected to the outside is provided inside the water collection block 8, and an outlet pipe 10 for discharging filtered water is provided between two backwash drain pipes 9. With this design, backwash water and filtered water are discharged separately by using a T-junction to install the outlet pipe 10 on the water collection block 8 installed on the top surface of the filter tank 3 and the backwash drain pipe 9 connected to the outside of the water collection block 8, and the conduit between the two backwash drain pipes 9.

[0078] It should be noted that, as Figure 2 As shown in the diagram, solenoid valves for controlling opening and closing are installed at corresponding positions on the backwash drain pipe 9 and the outlet pipe 10, and solenoid valves are also installed at corresponding positions on the water distribution structure 4, the air distribution pipe 51, and the backwash water pipe 52.

[0079] In one embodiment, both of the filter pools 3 are connected to one side by an vent pipe 11;

[0080] The vent pipe 11 is used to discharge the gas generated during the denitrification reaction. This design, with the vent pipe 11 inserted into a through-groove hole machined on the same side of the two filter tanks 3, helps to discharge the generated gas during the wastewater treatment process, preventing gas accumulation that could lead to pressure increases or affect the equipment system.

[0081] In one embodiment, the electrical and mechanical equipment area 2 includes a power distribution control cabinet for power supply, a backwash fan connected to the air distribution pipe 51, a backwash water pump connected to the backwash water pipe 52, and supporting auxiliary equipment.

[0082] The air inlet of the backwash fan can be connected to the air outlet of the vent pipe 11 to collect the gas produced by denitrification, which is then re-entered into the filter tank 3 by the suction action of the backwash fan. This design, with the power distribution control cabinet, backwash fan, and backwash water pump installed in the electrical and mechanical equipment area 2, wherein the backwash fan is connected to the air distribution pipe 51 port and the backwash water pump is connected to the backwash water pipe 52 port, allows for the sequential introduction of gas and water.

[0083] Preferably, the air inlet of the backwash blower is connected to the air outlet of the vent pipe 11, which can collect and recover the nitrogen produced by the denitrification reaction. The nitrogen is then drawn back into the filter tank 3 by the backwash blower, reducing dependence on external energy.

[0084] It should be noted that the auxiliary equipment included in the electrical and mechanical equipment area 2 includes, but is limited to, flow meters, pressure gauges, butterfly valves, and ladders.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0086] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0087] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Additionally, "several" refers to two or more. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

Claims

1. An autotrophic denitrification device, characterized in that: Includes a base plate (1), on one side of which is an electrical and mechanical equipment area (2), and on one side of which are two adjacent and alternately operating filter tanks (3). Each filter tank (3) is provided with a filter cap support plate (31), a gravel support layer (32), a packing layer (33) and a clear water layer (34) arranged from bottom to top. The filter cap support plate (31) is located on the lower side of the filter tank (3) and is separated within the filter tank (3) by an inlet area. A water distribution structure (4) is set in the water inlet area to homogenize the sewage before it enters the filter tank (3); The backwash assembly (5) includes an air distribution pipe (51) for introducing backwash gas into the water inlet area and a backwash water pipe (52) for introducing backwash gas into the water inlet area. The backwash water pipe (52) consists of a main pipe and several branch pipes (521) evenly distributed on the main pipe. Several water outlet micro-holes for spraying water flow are uniformly arranged on the branch pipes (521). A bubble generating component (6) is disposed outside the branch pipe (521) and connected to the backwash water pipe (52) to make the bubbles evenly dispersed into the water flow; The bubble generating assembly (6) includes a first external cylinder (61) covering the outside of the branch pipe (521). The first external cylinder (61) is provided with a converging-expanding section. The throat of the converging-expanding section is provided with a negative pressure port (611) for generating local negative pressure. The air distribution pipe (51) is connected to the inside of the converging-expanding section or the first external cylinder (61). A cleaning component (7) is disposed at the bottom of the filter tank (3) for cleaning the sludge accumulated in the inlet area and outputting it externally.

2. The autotrophic denitrification device according to claim 1, characterized in that: The branch pipe (521) is rotatably connected to the main pipe, and a circular plate (5211) is sleeved on one end of the branch pipe (521) corresponding to the main pipe. One end of the first external cylinder (61) is provided with an annular groove (62) adapted to and rotatably connected to the circular plate (5211). The outer edge of the circular plate (5211) extends into the annular groove (62) and is clearance-fitted with the annular groove (62). In the autotrophic denitrification reaction, each water outlet microhole opened on the branch pipe (521) is set downward in the first external cylinder (61). The circular plate (5211) is provided with a spiral guide plate (63) that rotates inside the first external cylinder (61). The spiral guide plate (63) is located outside the branch pipe (521). One end of the spiral guide plate (63) is provided with a bracket (64). The bracket (64) is provided with a blade (65) that drives the spiral guide plate (63) to rotate. The end face of the bracket (64) away from the branch pipe (521) is detachably provided with a rotating rod (66). The outer end of the rotating rod (66) is provided with a detachable and pull-out end plate (67) on the filter (3). The end of the rotating rod (66) corresponding to the end plate (67) passes through the end plate (67) and extends to the outside.

3. The autotrophic denitrification device according to claim 2, characterized in that: The bottom surface of the annular groove (62) is vertically provided with a water outlet channel, and the inlet of the water outlet channel is located on the side of the inner cavity of the first external cylinder (61). A spray hole is provided on the branch pipe (521) at the inlet position corresponding to the water outlet channel.

4. The autotrophic denitrification device according to claim 2, characterized in that: The cleaning component (7) includes a support frame (71) fixed to the lower end of the end plate (67) and a horizontal scraper (72) fixed on the support frame (71) and away from the end plate (67). Move the end plate (67) along the width direction of the filter (3), causing the lower contact surface of the horizontal scraper (72) to rub against the bottom of the filter (3), so that the sludge accumulated at the bottom of the filter (3) is collected in a cohesive manner towards the end plate (67).

5. The autotrophic denitrification device according to claim 4, characterized in that: The cleaning component (7) further includes a second external cylinder (73) disposed on the lower side of the end plate (67) and communicating with the bottom of the filter tank (3), and an auger (74) adapted to be rotatably disposed in the second external cylinder (73) and used to spirally transport the sludge gathered on the side of the end plate (67) to the outside. The bottom of the filter tank (3) is provided with an inclined surface on one side corresponding to the auger (74), and an opening is provided on the second external cylinder (73) at the lower position corresponding to the inclined surface. The opening is used to quickly guide and collect sludge into the second external cylinder (73) under the friction cleaning of the horizontal scraper (72).

6. The autotrophic denitrification device according to claim 5, characterized in that: One end of the auger (74) is provided with a transmission unit (75) that moves with the horizontal scraper (72) and drives the auger (74) to rotate. The transmission unit (75) includes a worm gear (751) sleeved on one end of the auger (74) and ball screws (752) and guide rods (753) adapted to be disposed at both ends of the horizontal scraper (72). The ball screw (752) is provided with a worm (754) at the corresponding end to drive the worm gear (751) to rotate and mesh with the worm gear (751).

7. The autotrophic denitrification device according to claim 1, characterized in that: A water collection block (8) is provided on the top surface of a single filter (3) and above the clear water layer (34). A backwash drain pipe (9) connected to the outside is provided in the water collection block (8). An outlet pipe (10) for discharging filtered water is provided between two backwash drain pipes (9).

8. The autotrophic denitrification device according to claim 1, characterized in that: Both of the filter tanks (3) are connected to one side by an vent pipe (11). The vent pipe (11) is used to discharge the gas generated during the denitrification reaction.

9. An autotrophic denitrification device according to claim 8, characterized in that: The electrical and mechanical equipment area (2) includes a power distribution control cabinet for power supply, a backwash fan connected to the air distribution pipe (51), a backwash water pump connected to the backwash water pipe (52), and supporting auxiliary equipment. The air inlet of the backwash blower is connected to the air outlet of the vent pipe (11) to collect the gas generated by denitrification, which is then re-entered into the filter tank (3) by the suction action of the backwash blower.

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