Anaerobic ammonium oxidation denitrification device and treatment method

Abstract

The present invention discloses an anaerobic ammonia oxidation denitrification device and treatment method, which relates to the technical field of anaerobic wastewater treatment, including a reaction tank, wherein a sewage water distribution component, a circulation reaction component and a three-phase separation component are arranged in the reaction tank, the sewage water distribution component is arranged at the bottom of the reaction tank, so that when sewage enters the reaction tank, an ascending vortex is formed, and activated sludge is laid on the sewage water distribution component to form an anaerobic sludge bed; the circulation reaction component is located in the sludge reaction zone in the middle of the reaction tank, and the circulation reaction component has a diversion mechanism that can guide the muddy water to circulate and divert in the sludge reaction zone, so that the ascending wastewater and the return sludge flow in different zones; the three-phase separation component is arranged on the top of the reaction tank. The present invention realizes that the muddy water mixed liquid forms a circulation system in the reaction tank by arranging a diversion cover and a diversion mechanism, so that the activated sludge can be evenly dispersed and the sludge residence time in the reaction process is guaranteed, which is helpful to improve the denitrification effect.

Description

Technical Field

[0001] The invention relates to the technical field of anaerobic wastewater treatment, and in particular to an anaerobic ammonia oxidation denitrification device and a treatment method. Background Art

[0002] Anaerobic ammonium oxidation (ANAMMOX) refers to the denitrification process in which anaerobic ammonium oxidizing bacteria (AAOB) use ammonia nitrogen as an electron donor and nitrite as an electron acceptor to directly convert it into nitrogen gas under anaerobic conditions. It is usually carried out in an upflow anaerobic sludge blanket reactor. The upflow anaerobic sludge blanket reactor (UASB reactor for short) consists of three functional zones: the water distribution zone at the bottom, the sludge reaction zone in the middle, and the gas-liquid-solid three-phase separation zone (including the sedimentation zone) at the top.

[0003] The core components of the UASB reactor are the three-phase separator and the water inlet and water distribution components. The existing three-phase separator has the disadvantage that the upward-flowing wastewater upflow and the downward-flowing sludge return flow interfere with each other. That is, the bubbles generated by the reaction process in the traditional reactor continuously merge during the rising process, gradually forming larger bubbles. The bubbles collide, combine, and rise in the process of stirring. After entering the three-phase separator, the returned sludge will be immediately affected by the rising water flow and bubbles after leaving the three-phase separator and entering the sludge reaction zone, resulting in the inability of the discrete activated sludge to quickly return to the bottom of the reactor. At the same time, for the flocculated return sludge, the bubbles often cannot break the bonding state of the sludge, causing the sludge floccules to sink directly to the bottom of the reactor, resulting in the uneven dispersion of the discrete sludge in the sludge reaction zone, insufficient effective concentration of the activated sludge, short sludge residence time during the reaction, and poor denitrification reaction effect. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the upward-flowing wastewater upflow and the downward-flowing sludge backflow in the anaerobic sludge bed reactor interfere with each other, resulting in uneven dispersion of discrete sludge in the sludge reaction zone and insufficient effective concentration of activated sludge, and to propose an anaerobic ammonia oxidation denitrification device and treatment method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An anaerobic ammonium oxidation denitrification device comprises a reaction tank, wherein a sewage water distribution component, a circulation reaction component and a three-phase separation component are arranged in the reaction tank, wherein:

[0007] The sewage water distribution component is arranged at the bottom of the reaction tank, so that when the sewage enters the reaction tank, an upward vortex is formed, and activated sludge is spread on the sewage water distribution component to form an anaerobic sludge bed;

[0008] A circulation reaction component is located in the sludge reaction zone in the middle of the reaction tank, and the circulation reaction component has a diversion mechanism that can guide the muddy water to circulate in the sludge reaction zone, so that the rising wastewater and the return sludge flow in different areas;

[0009] The three-phase separation component is arranged at the top of the reaction tank and is used for separating the gas, liquid and solid three phases after the wastewater is denitrified.

[0010] Preferably, the sewage water distribution assembly includes a sewage inlet pipe and a plurality of water distribution pipes radially arranged along the bottom of the reaction tank and distributed in a circular array, a plurality of water spray heads evenly distributed along the length direction of the water distribution pipe are opened on the side of the water distribution pipe, the input ends of the plurality of water distribution pipes and the output ends of the sewage inlet pipes are commonly connected to the same water distribution box, a plurality of water guide grooves with a height difference in the circumferential direction are opened at the bottom of the reaction tank, the water distribution pipe is located on the low side of the water guide groove, and the axial direction of the water spray head is parallel to the bottom inclined surface of the water guide groove.

[0011] Preferably, the bottom of the reaction tank is in a conical shape with the center bulging upward.

[0012] Preferably, the circulation reaction component includes a guide cover coaxially arranged at the center of the reaction tank, the guide cover is a cylinder with openings at both ends, the guide mechanism is located in the guide cover, the guide mechanism includes a rotating frame rotatably arranged in the guide cover, both axial ends of the rotating frame are provided with impellers, and the bottom of the impeller located below is fixedly installed with a shaft body 1, the shaft body 1 extends to the top of the sewage water distribution component and is provided with a driving structure, the two impellers are set in the same direction, and when the rotating frame rotates, the mud and water mixed reaction liquid is driven to flow from the upper part of the sludge reaction zone along the guide cover to the lower part to form a mud and water circulation path.

[0013] Preferably, the driving structure includes a mounting plate fixedly mounted on the bottom of the shaft body, and a plurality of baffle blades with arc-shaped cross-sections are equidistantly fixedly mounted on the outer peripheral surface of the mounting plate. The baffle blades are inclined along the bottom of the reaction tank, and the concave surfaces of the baffle blades face the water spray head.

[0014] Preferably, two groups of densely-grooved springs symmetrically arranged up and down are arranged between the two impellers, the densely-grooved springs are conical springs, the tips of the two groups of densely-grooved springs are correspondingly connected to form an hourglass shape, and a counterweight block is arranged at the connection between the two groups of densely-grooved springs.

[0015] Preferably, a magnetic column is installed on the side of the counterweight block, and a plurality of magnetic blocks are arranged on the inner wall of the air deflector. The magnetic blocks and the magnetic column are at the same horizontal height, and the magnetic poles of two adjacent magnetic blocks close to the magnetic column are opposite.

[0016] Preferably, the three-phase separation component includes a plurality of concentrically arranged blocking rings, the cross-section of the blocking rings is L-shaped with unequal widths, a triangular interception air chamber is formed below each of the blocking rings, the long plate surface of the blocking ring is close to the center of the reaction tank and extends to the lower end of the short plate surface of the adjacent blocking ring, a sludge return gap is formed between two adjacent blocking rings, a plurality of the blocking rings are connected and supported by a plurality of air guide pipes, and the air guide pipes are connected to the interception air chamber, an inverted cone-shaped sedimentation hood is fixedly connected between the plurality of air guide pipes, the sedimentation hood is coaxial with the guide hood, a mud collecting structure for accelerating sludge return is provided in the sedimentation hood, an overflow weir fixed to the inner wall of the reaction tank is provided above the blocking ring, a water outlet area is formed between the overflow weir and the inner wall of the reaction tank, a drain pipe connected to the water outlet area is provided on the reaction tank, the top of the overflow weir exceeds the sedimentation hood and is provided with a water retaining ring, the water retaining ring extends into the sedimentation hood and has a water flow channel between the sedimentation hood and the sedimentation hood.

[0017] Preferably, the mud collecting structure comprises a second shaft body fixedly arranged on the top of the impeller located above, a mounting frame is installed on the top of the second shaft body, and a plurality of spiral blades that fit with the inner wall of the sedimentation hood are fixedly arranged on the outer wall of the mounting frame.

[0018] A method for anaerobic ammonium oxidation denitrification comprises the following steps:

[0019] S1: The wastewater is passed into the reaction tank, and the wastewater is evenly output through the sewage water distribution component and impacts the anaerobic sludge bed, so that the wastewater carries the sludge to form a mud-water mixture. In the sludge reaction zone, the anaerobic ammonia-oxidizing bacteria in the activated sludge use ammonia nitrogen as an electron donor and nitrite as an electron acceptor to directly convert ammonia nitrogen into nitrogen gas. The nitrogen gas rises to the three-phase separation component under the action of buoyancy, and the synergistic reaction of mud and water realizes three-phase separation;

[0020] S2: Under the action of the sewage water distribution component, the muddy water rotates and rises in the reactor, enters the circulation reaction component to accelerate the reaction, and under the action of the diversion mechanism, guides the muddy water to circulate and divert in the sludge reaction area to extend the reaction time;

[0021] S3: After entering the three-phase separation component, nitrogen is directly discharged, and the activated sludge flocculates and settles back, and enters the circulation reaction component again. During the circulation process, the flocculated sludge is broken up to increase the effective concentration and residence time of the activated sludge in the sludge reaction zone.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. By setting up the guide cover and guide mechanism, the mud-water mixture forms a circulation system in the reaction tank, so that the activated sludge can be evenly dispersed and the sludge retention time in the reaction process is guaranteed, which helps to improve the denitrification effect and promote the effective contact and reaction between the sludge and the ammonia nitrogen in the wastewater.

[0024] 2. Through the sewage water distribution component, the water flow impacts the water guide groove when entering, forming an upward vortex in the reaction tank. With the mud-water circulation system, the outer side of the rising vortex moves upward into the three-phase separation component, and the center is the downward circulation flow. After the sludge is separated, the position of the sludge return does not conflict with the rising vortex, reducing the interference between the wastewater upflow and the sludge return. It helps to improve the separation efficiency of the sludge, reduce unnecessary mixing and interference, and thus optimize the reaction process.

[0025] 3. The inverted cone-shaped sedimentation hood is designed with spiral blades. When the spiral blades rotate, the sludge on the inner wall of the sedimentation hood is scraped and gathered to the bottom of the sedimentation hood. At the same time, the cone-shaped vortex generated by the spiral blades rotating in the sedimentation hood will gather the sludge to the center, accelerating the sedimentation and flocculation process of the sludge. It helps to accelerate the sludge return speed, improve the treatment efficiency, and further improve the denitrification effect.

[0026] 4. Two groups of dense-groove springs are set to form an hourglass shape, and with the guide cover, after the mud and water circulate and the sludge flocculation returns into the guide cover, the rotating frame rotates to make the counterweight block at the connection of the dense-groove spring shake, and under the magnetic force of the magnetic column and the magnetic block, the dense-groove spring shakes at a high frequency, breaking up the flocculated sludge passing through the guide cover to form more discrete activated sludge. This helps to ensure the effective concentration of the sludge, improve the activity of the sludge, and increase the residence time in the sludge reaction zone, thereby optimizing the denitrification process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the internal structure of an anaerobic ammonium oxidation denitrification device proposed by the present invention;

[0028] Figure 2 This is a schematic diagram of the appearance structure of an anaerobic ammonium oxidation denitrification device proposed by the present invention;

[0029] Figure 3 This is a schematic diagram of a three-dimensional cross-sectional structure of an anaerobic ammonium oxidation denitrification device proposed by the present invention;

[0030] Figure 4 This is a schematic diagram of a planar cross-sectional structure of an anaerobic ammonium oxidation denitrification device proposed by the present invention;

[0031] Figure 5 This is a schematic structural diagram of a flow guide mechanism in an anaerobic ammonium oxidation denitrification device proposed by the present invention;

[0032] Figure 6for Figure 4 A magnified view of part A;

[0033] Figure 7 This is a schematic diagram of the structure of a densely-grooved spring in an anaerobic ammonium oxidation denitrification device proposed by the present invention;

[0034] Figure 8 The present invention provides a schematic structural diagram of a flow guide cover in an anaerobic ammonium oxidation denitrification device.

[0035] In the figure: 1. reaction tank; 2. sewage water distribution assembly; 21. water distribution pipe; 211. sprinkler head; 22. sewage inlet pipe; 23. water distribution box; 24. water guide trough; 3. circulation reaction assembly; 31. deflector; 311. magnetic block; 32. rotating frame; 33. impeller; 34. shaft body one; 35. baffle blade; 36. dense-grooved spring; 361. counterweight; 362. magnetic column; 4. three-phase separation assembly; 41. blocking ring; 411. sludge return gap; 412. intercepting air chamber; 42. air guide pipe; 43. sedimentation hood; 44. overflow weir; 45. baffle ring; 46. shaft body two; 47. mounting frame; 48. spiral sheet; 49. drain pipe. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0038] Reference Figure 1-3 An anaerobic ammonia oxidation denitrification device comprises a reaction tank 1, wherein a sewage water distribution component 2, a circulation reaction component 3 and a three-phase separation component 4 are arranged in the reaction tank 1, wastewater is input into the reaction tank 1 through the sewage water distribution component 2, and fills the reaction tank 1 from bottom to top, and the mud-water mixture is formed into a mud-water circulation system in the reaction tank 1 through the circulation reaction component 3, so as to improve the effect of the denitrification reaction, and finally the three-phase separation component 4 is used to separate the reacted wastewater into three phases, so that the treated wastewater and the nitrogen generated by the reaction are discharged out of the reaction tank 1, and the activated sludge is flocculated in the three-phase separation component 4 and then refluxed to the reaction zone in the reaction tank 1.

[0039] The sewage water distribution component 2 is arranged at the bottom of the reaction tank 1, so that when sewage enters, an upward vortex is formed in the reaction tank 1, and activated sludge is spread on the sewage water distribution component 2 to form an anaerobic sludge bed. When sewage enters, the activated sludge on the anaerobic sludge bed is dispersed in the wastewater with the water flow through the impact of the water flow to become discrete state for biological reaction.

[0040] Reference Figure 1-5 The sewage water distribution component 2 includes a sewage water inlet pipe 22 and a plurality of water distribution pipes 21 radially arranged along the bottom of the reaction tank 1 and distributed in a circular array. The sewage water inlet pipe 22 is fixed on the reaction tank 1. A plurality of sprinkler heads 211 are evenly distributed along the length direction of the water distribution pipe 21 on the side of the water distribution pipe 21. The axis of the sprinkler head 211 is perpendicular to the water distribution pipe 21, and all the sprinkler heads 211 are arranged in a clockwise direction. The input ends of the plurality of water distribution pipes 21 and the output ends of the sewage water inlet pipe 22 are commonly connected to the same water distribution box 23. The water distribution box 23 plays a transition role. The wastewater enters the water distribution box 23 through the sewage water inlet pipe 22, and is then transported to different water distribution pipes 21 through the water distribution box 23. The water spray head 211 on 1 discharges water into the reaction tank 1, and the water spray head 211 sprays horizontally in a clockwise direction to disperse the anaerobic sludge bed. As the water level rises, a mud-water mixture containing discrete activated sludge is formed, and as the water spray head 211 continues to spray water, the mud and water form a vortex in the clockwise direction. A plurality of water guide grooves 24 with a height difference in the circumferential direction are opened at the bottom of the reaction tank 1. The water distribution pipe 21 is located on the low side of the water guide groove 24, and the axial direction of the water spray head 211 is parallel to the bottom slope of the water guide groove 24. The water flow sprayed by the water spray head 211 will form an upward trend along the water guide groove 24, thereby forming an upward vortex, reducing the sludge sedimentation rate, and increasing the reaction residence time of the sludge.

[0041] Reference Figure 1-3 The bottom of the reaction tank 1 is in a cone shape with the center bulging upward, which is conducive to the formation of an ascending cyclone and can reduce the deposition of activated sludge toward the center of the anaerobic sludge bed in the cyclone.

[0042] The circulating reaction component 3 is located in the sludge reaction zone in the middle of the reaction tank 1, and the anaerobic ammonia oxidation denitrification reaction is carried out. The commonly used upflow anaerobic sludge bed reaction tower does not have a dynamic stirring structure. The bubbles generated by the reaction process are continuously merged during the rising process, gradually forming larger bubbles, and the bubbles collide, combine, and rise in the process. The stirring effect is played. These processes occur in the sludge reaction zone, but due to the limited stirring effect of the bubble agitation, the return sludge separated by the three-phase separation component 4 will interfere with the rising bubbles and the wastewater upflow. Specifically, the rising bubbles are easy to The discrete activated sludge is carried to the upper part of the sludge reaction zone, while the flocculated sludge is difficult to be dispersed by the impact of bubbles, and will directly settle to the bottom of the sludge reaction zone, which will cause the activated sludge to be unevenly dispersed in the sludge reaction zone, and the effective concentration of the activated sludge actually participating in the reaction is insufficient. The circulating reaction component 3 has a diversion mechanism that can guide the muddy water to circulate and divert in the sludge reaction zone, so that the rising wastewater and the return sludge flow in different areas, so that the activated sludge can be evenly dispersed and the sludge residence time in the reaction process is guaranteed, which helps to improve the denitrification effect and promote the effective contact and reaction between the activated sludge and the ammonia nitrogen in the wastewater.

[0043] Reference Figure 1-5 The circulation reaction component 3 includes a guide cover 31 coaxially arranged at the center of the reaction tank 1. A cross bar is arranged in the reaction tank 1 to fix the guide cover 31. The guide cover 31 is a cylinder with two ends opened. The guide mechanism is located in the guide cover 31. The guide mechanism applies a driving force to the muddy water in the guide cover 31, so that the muddy water enters from the upper end of the guide cover 31 and is discharged from the lower end. The guide cover 31 is located in the sludge reaction area and is completely immersed. When the guide cover 31 guides the muddy water to flow, the muddy water outside the guide cover 31 cooperates with the rising vortex formed by the sewage water distribution component 2, so that the muddy water outside the guide cover 31 is upward. The muddy water in the guide cover 31 flows downward to form an annular muddy water circulation, wherein the three-phase separation component 4 is input along with the rising vortex, wherein the separated sludge returns to flow downward from the center of the reaction tank 1, corresponding to the guide cover 31, in the same direction as the muddy water flow in the guide cover 31, the outer side of the rising vortex moves upward to enter the three-phase separation component 4, and the center position is a downward circulation flow. After the sludge is separated, the position of the sludge return does not conflict with the rising vortex, reducing the interference between the wastewater upflow and the sludge return, which helps to improve the sludge separation efficiency and reduce unnecessary interference.

[0044] The diversion mechanism includes a rotating frame 32 rotatably arranged in the guide cover 31, and paddle wheels 33 are arranged at both axial ends of the rotating frame 32. A shaft 34 is fixedly installed at the bottom of the paddle wheel 33 located at the bottom. The shaft 34 extends to the top of the sewage water distribution component 2 and is provided with a driving structure. The impact water flow generated clockwise when the wastewater enters the water acts on the driving structure, and the kinetic energy generated by the driving structure drives the shaft 34 to rotate, so that the shaft 34 drives the rotating frame 32 to rotate. The paddle wheels 33 make the muddy water flow in the guide cover 31 in a directional manner as the rotating frame 32 rotates. The two paddle wheels 33 are arranged in the same direction. When the rotating frame 32 rotates, the muddy water mixed reaction liquid is driven to flow from the upper part of the sludge reaction zone along the guide cover 31 to the lower part to form a muddy water circulation path.

[0045] Reference Figure 3-5 The driving structure includes a mounting plate fixedly arranged at the bottom of the shaft body 34, the mounting plate is located at the bottom of the reaction tank 1, and a plurality of baffle blades 35 with arc-shaped cross-sections are fixedly installed at equal intervals on the outer peripheral surface of the mounting plate. The baffle blades 35 are arranged obliquely along the bottom of the reaction tank 1, consistent with the contour of the bottom of the reaction tank 1, and the concave surface of the baffle blade 35 faces the water spray head 211. When the water spray head 211 discharges water, the water flow impacts the arc-shaped concave surface of the baffle blade 35, driving the baffle blade 35 to deflect and thereby driving the shaft body 34 to rotate.

[0046] The three-phase separation component 4 is arranged on the top of the reaction tank 1, and is used for separating the three phases of gas, liquid and solid after the sewage is denitrified. After the biological reaction of the activated sludge, the ammonia nitrogen in the mud water is converted into nitrogen. As the water level rises, the mud water enters the three-phase separation component 4, and the nitrogen is discharged first. Secondly, the mud water entering the three-phase separation component 4 no longer enters the mud water circulation, and the residual sludge in the mud water flocculates and precipitates back to the sludge reaction area. The water after the sludge is separated is discharged from the reaction tank 1 as the water level rises.

[0047] Reference Figure 3-6The three-phase separation component 4 includes a plurality of concentrically arranged blocking rings 41. The cross-section of the blocking ring 41 is L-shaped with unequal widths. A triangular interception air chamber 412 is formed under each blocking ring 41. The nitrogen generated in the sludge reaction zone rises rapidly in the muddy water and finally stays in the interception air chamber 412. The long plate surface of the blocking ring 41 is close to the center of the reaction tank 1 and extends to the lower end of the short plate surface of the adjacent blocking ring 41, forming a sludge return gap 411 between two adjacent blocking rings 41. The long plate surface and the short plate surface of the blocking ring 41 are misaligned, and the position of the sludge return gap 411 is blocked in the longitudinal projection. In order to ensure that the nitrogen can be completely intercepted in the interception air chamber 412 when it rises, the plurality of blocking rings 41 are connected and supported by a plurality of air guide pipes 42, and the air guide pipes 42 are connected to the blocking rings 41. The intercepting air chamber 412 is connected, and the nitrogen in the intercepting air chamber 412 is discharged outward through the air guide pipe 42. There are multiple air guide pipes 42, and the multiple air guide pipes 42 converge at the top of the reaction tank 1 and are connected to a main exhaust pipe. The sludge return gap 411 can allow mud and water to pass through and reach the top of the blocking ring 41. After the mud and water pass through the blocking ring 41, they are no longer affected by the mud and water circulation in the sludge reaction zone. The activated sludge in the mud and water gradually settles and falls on the upper surface of the blocking ring 41, and flows back downward along the blocking ring 41. Finally, the sludge returns to the sludge reaction zone through the sludge return gap 411. Since the long plate surface of the blocking ring 41 is close to the center of the reaction tank 1, the returned sludge tends to move to the position of the guide cover 31, which is conducive to continued circulation through the guide cover 31 to ensure the effective content of the activated sludge in the sludge reaction zone.

[0048] A settling hood 43 in an inverted cone shape is fixedly connected between the multiple air guide pipes 42. The settling hood 43 is coaxial with the guide hood 31 and is fixed by the air guide pipe 42. The discrete sludge in the wastewater cannot be quickly precipitated and refluxed. Part of the discrete sludge is suspended in the wastewater and diffuses into the settling hood 43. A sludge collecting structure for accelerating the sludge reflux is provided in the settling hood 43. The remaining sludge small particles are gathered and flocculated by the sludge collecting structure and then refluxed into the sludge reaction zone again. An overflow weir 44 fixed to the inner wall of the reaction tank 1 is provided above the blocking ring 41. A water outlet area is formed between the overflow weir 44 and the inner wall of the reaction tank 1. After the water rises, the upper layer of clean water overflows the overflow weir 44 and reaches the water outlet area. A drain pipe 49 connected to the water outlet area is provided on the reaction tank 1, and the water in the water outlet area is discharged outward through the drain pipe 49. The top of the overflow weir 44 exceeds the sedimentation cover 43 and is provided with a water retaining ring 45. The water retaining ring 45 extends into the sedimentation cover 43 and has a water flow channel between the sedimentation cover 43. By providing the water retaining ring 45, the rising direction of the water flow can be limited, so that the water flow must first enter the sedimentation cover 43 before it can overflow upward into the overflow weir 44, so that the sludge in the wastewater can first complete the sedimentation in the sedimentation cover 43, ensuring that the sludge and the wastewater are completely separated.

[0049] Reference Figure 3-6The sludge collecting structure includes a shaft body 46 fixedly arranged on the top of the impeller 33 located above, a mounting frame 47 is installed on the top of the shaft body 46, and a plurality of spiral blades 48 that are in contact with the inner wall of the sedimentation cover 43 are fixedly arranged on the outer wall of the mounting frame 47. When the impeller 33 rotates with the rotating frame 32, the shaft body 46 is driven to rotate, so that the spiral blades 48 rotate, and a vortex is formed in the conical sedimentation cover 43, so that the discrete activated sludge converges to the center under the action of the vortex, accelerates the sedimentation and flocculation process of the sludge, helps to accelerate the reflux speed of the sludge, improves the treatment efficiency, and further improves the denitrification effect. Since the sludge collection direction is opposite to the position of the overflow weir 44, the cleanliness of the wastewater is guaranteed when it is discharged. At the same time, the spiral blades 48 can also scrape off the sludge adhering to the inner wall of the sedimentation cover 43 to ensure the separation effect of the sludge and the wastewater.

[0050] Reference Figure 7-8 Two groups of densely-threaded springs 36 symmetrically arranged in an upper and lower direction are arranged between the two impellers 33. The pitch of the densely-threaded springs 36 is set to be less than 0.5 cm. The densely-threaded springs 36 are conical springs. The tips of the two groups of densely-threaded springs 36 are connected to form an hourglass shape. A counterweight 361 is arranged at the connection between the two groups of densely-threaded springs 36. When the rotating frame 32 rotates, the densely-threaded springs 36 and the counterweight 361 rotate along with the rotation. The counterweight 361 shakes when it rotates, so that the densely-threaded springs 36 produce a shearing effect in the shaking process. The densely-threaded springs 36 guide The flow cover 31 is divided into three partitions, a, b and c. The returned flocculated sludge enters the flow guide cover 31 under the action of mud and water circulation. The two sets of dense-groove springs 36 are in an hourglass shape. The sludge must enter the b partition from the a partition, and then enter the c partition from the b partition. Therefore, in the process of sequential circulation, the sludge needs to be sheared by the dense-groove springs 36 twice to break up the flocculated sludge and form more discrete activated sludge, which helps to ensure the effective concentration of the sludge, improve the activity of the sludge, and enhance the residence time in the sludge reaction zone, thereby optimizing the denitrification process.

[0051] Reference Figure 7-8 A magnetic column 362 is installed on the side of the counterweight block 361. The magnetic column 362 can offset the center of gravity of the counterweight block 361 and increase the swing amplitude of the counterweight block 361. A plurality of magnetic blocks 311 are arranged on the inner wall of the air deflector 31. The magnetic blocks 311 and the magnetic columns 362 are at the same horizontal height, and the magnetic poles of two adjacent magnetic blocks 311 close to the side of the magnetic columns 362 are opposite. When the rotating frame 32 rotates, the magnetic columns 362 act on different magnetic blocks 311, and the magnetic poles of the magnetic blocks 311 at adjacent positions are opposite. Therefore, when the magnetic columns 362 pass through different magnetic blocks 311, they respectively attract and repel the magnetic columns 362, thereby increasing the swing frequency of the counterweight block 361, causing the dense-grooved spring 36 to swing at a high frequency, thereby improving the dispersion effect on the sludge.

[0052] A method for anaerobic ammonium oxidation denitrification comprises the following steps:

[0053] S1: The wastewater is passed into the reaction tank 1, and the wastewater is evenly output through the sewage water distribution component 2, and impacts the anaerobic sludge bed, so that the wastewater carries the sludge to form a mud-water mixture. In the sludge reaction zone, the anaerobic ammonia-oxidizing bacteria in the activated sludge use ammonia nitrogen as an electron donor and nitrite as an electron acceptor to directly convert ammonia nitrogen into nitrogen gas. The nitrogen gas rises to the three-phase separation component 4 under the action of buoyancy, and the synergistic reaction of mud and water realizes three-phase separation;

[0054] S2: Under the action of the sewage water distribution component 2, the muddy water rotates and rises in the reactor, enters the circulation reaction component 3 to accelerate the reaction, and under the action of the diversion mechanism, guides the muddy water to circulate and divert in the sludge reaction area to extend the reaction time;

[0055] S3: After entering the three-phase separation component 4, the nitrogen is directly discharged, and the activated sludge flocculates and settles back to enter the circulation reaction component 3 again. During the circulation process, the flocculated sludge is broken up to increase the effective concentration and residence time of the activated sludge in the sludge reaction zone.

[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An anaerobic ammonium oxidation denitrification device, comprising a reaction tank (1), characterized in that: The reaction tank (1) is provided with a sewage water distribution component (2), a circulation reaction component (3) and a three-phase separation component (4), wherein: The sewage water distribution component (2) is arranged at the bottom of the reaction tank (1), so that when sewage enters the reaction tank (1), an upward vortex is formed, and activated sludge is spread on the sewage water distribution component (2) to form an anaerobic sludge bed; A circulation reaction component (3) is located in the sludge reaction zone in the middle of the reaction tank (1), and the circulation reaction component (3) has a diversion mechanism that can guide the sludge water to circulate in the sludge reaction zone, so that the rising wastewater and the return sludge flow in different zones; A three-phase separation component (4) is arranged on the top of the reaction tank (1) and is used to separate the three phases of gas, liquid and solid after the sewage is denitrified; The sewage water distribution assembly (2) comprises a sewage water inlet pipe (22) and a plurality of water distribution pipes (21) radially arranged along the bottom of the reaction tank (1) and distributed in a circumferential array; a plurality of water spray heads (211) uniformly distributed along the length direction of the water distribution pipe (21) are provided on the side of the water distribution pipe (21); the input ends of the plurality of water distribution pipes (21) and the output ends of the sewage water inlet pipe (22) are connected to a same water distribution box (23); a plurality of water guide grooves (24) having a height difference in a circumferential direction are provided at the bottom of the reaction tank (1); the water distribution pipe (21) is located on a lower side of the water guide groove (24); and the axial direction of the water spray head (211) is parallel to the bottom inclined surface of the water guide groove (24); The circulation reaction assembly (3) comprises a flow guide cover (31) coaxially arranged at the center position of the reaction tank (1), the flow guide cover (31) is a cylinder with openings at both ends, the flow guide mechanism is located in the flow guide cover (31), and the flow guide mechanism comprises a rotating frame (32) rotatably arranged in the flow guide cover (31), both axial ends of the rotating frame (32) are provided with paddle wheels (33), and the bottom of the paddle wheel (33) located at the bottom is fixedly mounted with a shaft body (34), the shaft body (34) extends to the top of the sewage water distribution assembly (2) and is provided with a driving structure, the two paddle wheels (33) are arranged in the same direction, and when the rotating frame (32) rotates, the mud-water mixed reaction liquid is driven to flow from the upper part of the sludge reaction zone along the flow guide cover (31) to the lower part to form a mud-water circulation path.

2. The anaerobic ammonium oxidation denitrification device according to claim 1, characterized in that: The bottom of the reaction tank (1) is in a conical shape with the center bulging upward.

3. The anaerobic ammonium oxidation denitrification device according to claim 2, characterized in that: The driving structure comprises a mounting plate fixedly arranged at the bottom of the shaft body (34); a plurality of baffle blades (35) having an arc-shaped cross section are fixedly installed at equal intervals on the outer peripheral surface of the mounting plate; the baffle blades (35) are arranged obliquely along the bottom of the reaction tank (1), and the concave surfaces of the baffle blades (35) face the water spray head (211).

4. The anaerobic ammonium oxidation denitrification device according to claim 2, characterized in that: Two groups of densely-threaded springs (36) symmetrically arranged in an upper and lower direction are arranged between the two impeller wheels (33); the densely-threaded springs (36) are conical springs; the tips of the two groups of densely-threaded springs (36) are connected correspondingly to form an hourglass shape; and a counterweight (361) is arranged at the connection between the two groups of densely-threaded springs (36).

5. The anaerobic ammonium oxidation denitrification device according to claim 4, characterized in that: A magnetic column (362) is installed on the side of the counterweight block (361), and a plurality of magnetic blocks (311) are arranged on the inner wall of the air deflector (31). The magnetic blocks (311) and the magnetic column (362) are at the same level, and the magnetic poles of two adjacent magnetic blocks (311) close to the magnetic column (362) are opposite.

6. The anaerobic ammonium oxidation denitrification device according to claim 1, characterized in that: The three-phase separation component (4) comprises a plurality of concentrically arranged blocking rings (41), the cross-section of the blocking rings (41) being L-shaped with unequal widths, a triangular interception air chamber (412) being formed below each of the blocking rings (41), the long plate surface of the blocking ring (41) being close to the center of the reaction tank (1) and extending to the lower end of the short plate surface of an adjacent blocking ring (41), a sludge return gap (411) being formed between two adjacent blocking rings (41), the plurality of blocking rings (41) being connected and supported by a plurality of air guide pipes (42), and the air guide pipes (42) being in communication with the interception air chamber (412), and the plurality of air guide pipes (42) being connected to each other. A sedimentation hood (43) in an inverted cone shape is also fixedly connected thereto. The sedimentation hood (43) is coaxial with the guide hood (31). A sludge collecting structure for accelerating sludge return is provided in the sedimentation hood (43). An overflow weir (44) fixed to the inner wall of the reaction tank (1) is provided above the blocking ring (41). A water outlet area is formed between the overflow weir (44) and the inner wall of the reaction tank (1). A drainage pipe (49) connected to the water outlet area is provided on the reaction tank (1). The top of the overflow weir (44) exceeds the sedimentation hood (43) and is provided with a water retaining ring (45). The water retaining ring (45) extends into the sedimentation hood (43) and has a water flow channel between the overflow weir (44) and the sedimentation hood (43).

7. The anaerobic ammonium oxidation denitrification device according to claim 6, characterized in that: The mud collecting structure comprises a second shaft body (46) fixedly arranged on the top of the impeller (33) located above, a mounting frame (47) being mounted on the top of the second shaft body (46), and a plurality of spiral blades (48) which are in contact with the inner wall of the sedimentation cover (43) being fixedly arranged on the outer wall of the mounting frame (47).

8. A method for anaerobic ammonium oxidation denitrification, using the anaerobic ammonium oxidation denitrification device according to any one of claims 1 to 7 for treatment, characterized in that: The following steps are involved: S1: wastewater is introduced into the reaction tank (1), the wastewater is uniformly discharged through the sewage water distribution component (2), and impacts the anaerobic sludge bed, so that the wastewater carries the sludge to form a sludge-water mixture. In the sludge reaction zone, the anaerobic ammonia-oxidizing bacteria in the activated sludge use ammonia nitrogen as an electron donor and nitrite as an electron acceptor to directly convert ammonia nitrogen into nitrogen gas. The nitrogen gas rises to the three-phase separation component (4) under the action of buoyancy, and the three-phase separation of the sludge and water is achieved by coordinated reaction; S2: Under the action of the sewage water distribution component (2), the muddy water rotates and rises in the reactor, enters the circulation reaction component (3) to accelerate the reaction, and under the action of the diversion mechanism, guides the muddy water to circulate and divert in the sludge reaction area to extend the reaction time; S3: After entering the three-phase separation component (4), the nitrogen is directly discharged, and the activated sludge flocculates and settles back to the circulation reaction component (3) again. During the circulation process, the flocculated sludge is broken up to increase the effective concentration and residence time of the activated sludge in the sludge reaction zone.

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