Anaerobic ammonia oxidation denitrification device suitable for rare earth tail water

Abstract

The invention relates to the field of rare earth tail water treatment, in particular to an anaerobic ammonia oxidation denitrification device suitable for rare earth tail water, which comprises a reactor, the interior of the reactor is hollow and cylindrical, the upper side of the reactor is communicated with a communicating pipe, and one end, far away from the reactor, of the communicating pipe is communicated with a pre-reactor; a sieving device for sieving the rare earth tail water is connected in the pre-reactor; according to the invention, nitration reaction and anaerobic ammonia oxidation reaction are respectively carried out in the pre-reactor and the reactor, the rare earth tail water is successively subjected to denitrification treatment in the pre-reactor and the reactor, and then the treated rare earth tail water in the reactor is injected into the pre-reactor again through the draw-off pump for nitration reaction treatment. The rare earth tail water denitrification device realizes that the rare earth tail water is subjected to denitrification treatment only through reciprocating circulation between the two reaction containers of the pre-reactor and the reactor until the treatment reaches the standard, so that the problem that a large space is occupied when more reaction containers are used is effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of rare earth tail water treatment, and in particular to an anaerobic ammonia oxidation denitrification device suitable for rare earth tail water. Background Art

[0002] Rare earth tail water is a high-concentration hazardous wastewater generated during the production of rare earth elements. Its high salinity, high organic matter, high concentration of heavy metals and other characteristics greatly limit its resource utilization and environmental friendliness. At present, the denitrification technologies used for rare earth tail water mainly use A / O process technology and anaerobic ammonium oxidation technology. Among them, anaerobic ammonium oxidation technology mainly uses anaerobic ammonium oxidation (Anammox) bacteria to directly convert ammonia nitrogen into and nitrite nitrogen The process of converting it into nitrogen (N2) is particularly suitable for treating rare earth tail water containing high concentrations of ammonia nitrogen. It is an efficient, energy-saving and environmentally friendly denitrification method with great potential in its application in rare earth tail water.

[0003] However, there are usually some problems in the denitrification means of ordinary rare earth tail water in daily use. With the development of science and technology, technicians in related fields have also optimized the anaerobic ammonia oxidation denitrification technology in large quantities. In order to make a more accurate comparison, the denitrification device for rare earth tail water disclosed in the Chinese patent with publication number CN114590893A includes a multi-stage nitrification-anaerobic ammonia oxidation unit in series, each nitrification-anaerobic ammonia oxidation unit includes a nitrification reaction tank, a sedimentation tank and an anaerobic ammonia oxidation reaction tank connected in sequence, and the top of the nitrification reaction tank and the sedimentation tank has a first water inlet channel, and the top of the sedimentation tank and the anaerobic ammonia oxidation reaction tank has a second water inlet channel. When it is used, the rare earth tail water to be treated is processed in turn through the multi-stage nitrification reaction tank, the sedimentation tank and the anaerobic ammonia oxidation reaction tank in series, without strictly controlling the ammonia nitrogen and nitrite in the effluent of the nitrification reaction tank within a specific ratio range, and the effective removal of ammonia nitrogen and total nitrogen is achieved.

[0004] However, the above-mentioned denitrification device still has some shortcomings in the actual use process: since the above-mentioned device needs to be connected in series in sequence through multiple nitrification reaction tanks, sedimentation tanks and anaerobic ammonium oxidation reaction tanks to denitrify the rare earth tail water when in use, and setting up several nitrification reaction tanks, sedimentation tanks and anaerobic ammonium oxidation reaction tanks in series on the ground will undoubtedly occupy a large ground space, which is not very suitable for places with a small site area. In addition, the above-mentioned device uses multiple nitrification reaction tanks, sedimentation tanks and anaerobic ammonium oxidation reaction tanks arranged in series to achieve layer-by-layer relief of the impact of water quality and water quantity, that is, the nitrification reaction tank, sedimentation tank and anaerobic ammonium oxidation reaction tank located at the front end of the treatment system are subject to the greatest impact load on water quality and water quantity, which is not conducive to the survival of microorganisms therein to denitrify the rare earth tail water, resulting in reduced efficiency and effect of denitrification treatment of the rare earth tail water.

[0005] Therefore, based on the above-stated viewpoint, there is still room for improvement in the existing means for denitrifying rare earth tail water. Summary of the invention

[0006] In order to solve the above problems, the present invention provides an anaerobic ammonia oxidation denitrification device suitable for rare earth tail water, including a reactor. The reactor is hollow inside and is cylindrically arranged. A connecting pipe is connected to the upper side of the reactor. The end of the connecting pipe away from the reactor is connected to a pre-reactor. A sieve for screening the rare earth tail water is connected to the pre-reactor.

[0007] The screener includes a connecting sieve plate connected to the inner wall of the pre-reactor, the connecting sieve plate divides the pre-reactor into a sedimentation zone and a buffer zone from top to bottom, the connecting pipe is arranged on the upper side of the sedimentation zone and is connected to the sedimentation zone to introduce the supernatant in the upper layer of the sedimentation zone into the reactor, and the buffer zone is used to provide a temporary storage space for the rare earth tail water to be treated, and to reduce the impact load generated when the rare earth tail water is input.

[0008] Preferably, the screener further comprises a filter cartridge having a conical opening structure connected to the screen plate.

[0009] Preferably, the pre-reactor is further provided with an agitator for promoting reaction efficiency, the agitator comprising a driving rotating rod connected to the sieve plate and passed through the pre-reactor, and a plurality of pushing plates located in the precipitation zone are evenly connected to the driving rotating rod circumferentially.

[0010] Preferably, a plurality of push plates connecting the sieve plate and the driving rotating rod and connected to the driving rotating rod are also provided in the reactor, and a rotating plate connected to the plurality of push plates is also sleeved on the driving rotating rod in the reactor.

[0011] Preferably, the rotating plate and the connecting sieve plate are spaced apart from each other, and the diameter of the rotating plate is smaller than the diameter of the connecting sieve plate. The rotating plate and several connected pushing plates are arranged at corresponding connecting pipes to reduce the fluctuation of rare earth tail water when it enters the reactor from the pre-reactor.

[0012] Preferably, the pre-reactor is also connected to an aeration head for regulating the dissolved oxygen content in the pre-reactor, the aeration head includes an exhaust pipe which is connected to the pre-reactor and is arranged in an annular structure and is limit-connected to the inner wall of the pre-reactor, a plurality of exhaust holes for exhaust are evenly opened circumferentially on the exhaust pipe, the upper end of the exhaust pipe is also connected to an air guide pipe which passes upward out of the pre-reactor, and the air guide pipe is connected to an air supply component installed on the pre-reactor.

[0013] Preferably, the connecting tube is limitedly connected to a limiting sleeve, a sliding connecting rod is passed through the limiting sleeve, one end of the sliding connecting rod inserted in the limiting sleeve is connected to a driven clamp block, a compression spring is commonly connected between the driven clamp block and the inner side wall of the limiting sleeve, and one end of the sliding connecting rod passing through the limiting sleeve is connected to a blocking block for closing the connecting tube.

[0014] Preferably, one end of the blocking block away from the limiting sleeve abuts against a guide push block, and one end of the guide push block away from the blocking block is provided with a connecting lever connected to the air guide pipe.

[0015] Preferably, the outer side surface of the gas-guiding connecting pipe is sleeved with a guide sleeve connected to the pre-reactor, and the outer side surface of the gas-guiding connecting pipe is sleeved with a limit block fitted with the inner side wall of the guide sleeve.

[0016] Preferably, an extraction pump is connected to the outer side surface of the lower end of the reactor, and the output end of the extraction pump is connected to a reflux pipe connected to the pre-reactor, so as to re-inject the rare earth tail water treated in the reactor into the pre-reactor for further denitrification treatment.

[0017] In summary, the present application includes at least one of the following beneficial technical effects:

[0018] 1. The present invention sets a pre-reactor and a reactor connected to each other as reaction vessels, and performs nitrification reaction and anaerobic ammonia oxidation reaction in the pre-reactor and the reactor respectively, so that the rare earth tail water to be treated is denitrified in the pre-reactor and the reactor in turn, and then the rare earth tail water treated in the reactor is injected into the pre-reactor again through an extraction pump for nitrification reaction treatment, so as to realize denitrification treatment of the rare earth tail water only in a reciprocating cycle between the two reaction vessels of the pre-reactor and the reactor until the treatment meets the standards, effectively reducing the problem of occupying a large space when more reaction vessels are needed.

[0019] 2. The present invention effectively intercepts the sludge particles generated when the microorganisms in the container treat the rare earth tail water by using a screener arranged in the prereactor and the reactor, thereby forming a sludge bed layer of a certain level in the prereactor and the reactor, and allowing the rare earth tail water to penetrate the sludge bed layer from bottom to top or from top to bottom when input into the prereactor and the reactor. The sludge bed layer can efficiently intercept and degrade the organic matter contained in the rare earth tail water in the prereactor and the reactor. At the same time, in the process of the rare earth tail water passing through the sludge bed layer, the sludge particles with smaller particles and poorer sedimentation performance in the sludge bed layer are also driven to float in the direction of the water flow, so as to avoid excessive sedimentation of the sludge particles and the compaction of the sludge bed layer.

[0020] 3. The present invention controls the upward or downward movement rate of the input rare earth tail water in the pre-reactor and the reactor to achieve the effect of the treatment time of the rare earth tail water by the microorganisms in the pre-reactor and the reactor. Through multiple reciprocating cycles of mutual flow, the problem of strictly controlling the ratio of ammonia nitrogen and nitrite in the pre-reactor and the reactor is avoided, and the effective removal of ammonia nitrogen and total nitrogen is achieved. After the rare earth tail water treated in the reactor is injected into the pre-reactor through a reciprocating cycle by an extraction pump, a certain amount of organic carbon source can be supplemented in the pre-reactor to reduce the demand for adding organic carbon source to the pre-reactor.

[0021] Fourth, the present invention allows the rare earth tail water input into the pre-reactor to flow in the pre-reactor in an upwelling manner. When the rare earth tail water is subsequently input into the pre-reactor, the flow direction of the rare earth tail water after the input is limited by the internal chamber of the pre-reactor, and the impact load generated by the rare earth tail water during the input is buffered by the existing rare earth tail water in the pre-reactor, thereby achieving the effect of buffering and weakening the impact load generated when the rare earth tail water is input. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 It is a cross-sectional structural diagram of the pre-reactor and the reactor of the present invention.

[0025] Figure 3 It is a schematic structural diagram of the sifter of the present invention.

[0026] Figure 4 It is a structural schematic diagram of the aeration head of the present invention.

[0027] Figure 5 The present invention Figure 4 A is an enlarged view of the middle image.

[0028] Figure 6 The present invention Figure 4 Enlarged view of B.

[0029] Figure 7 It is a schematic structural diagram of the barrier block of the present invention.

[0030] Figure 8 2 is a diagram showing an implementation of a barrier block according to the present invention.

[0031] In the figure, 1, reactor; 10, connecting pipe; 11, pre-reactor; 12, feeding port; 13, water inlet pipe; 14, water outlet pipe; 2, screener; 20, connecting screen plate; 21, filter cartridge; 210, sewage pipe; 3, agitator; 30, driving rotating rod; 31, pushing plate; 32, rotating plate; 4, aeration head; 40, exhaust pipe; 41, air guide connecting pipe; 42, air supply part; 43, limiting sleeve; 430, sliding connecting rod; 431, driven block; 432, compression spring; 433, blocking block; 434, guide push block; 435, connecting lever; 44, guide sleeve; 440, limiting block; 45, limiting slider; 450, limiting slide groove; 5, extraction pump; 50, reflux pipe. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 To Attachment Figure 8 While embodiments of the invention have been described in detail, the invention can be implemented in many different ways as defined and covered by the claims.

[0033] The embodiment of the present application discloses an anaerobic ammonia oxidation denitrification device suitable for rare earth tail water, which illustrates that the anaerobic ammonia oxidation denitrification device for rare earth tail water is mainly used in the process of denitrification of rare earth tail water, and achieves the effect of denitrification treatment of rare earth tail water in terms of technical effect; in particular, in the process of denitrification treatment of rare earth tail water, the rare earth tail water is denitrified by combining nitrification denitrification and anaerobic ammonia oxidation denitrification, thereby effectively improving the efficiency of denitrification treatment of rare earth tail water; further, the anaerobic ammonia oxidation denitrification device for rare earth tail water also effectively avoids the problem of occupying a large area on the ground for installing more reaction vessels by reciprocating nitrification denitrification and anaerobic ammonia oxidation denitrification cycles between a pre-reactor and a reactor.

[0034] Reference Figure 1 and Figure 2 As shown, an anaerobic ammonia oxidation denitrification device suitable for rare earth tail water includes a reactor 1, a connecting pipe 10, a pre-reactor 11, a feeding port 12, a water inlet pipe 13, a water outlet pipe 14 and a sifter 2. The reactor 1 is hollow inside and is arranged in a cylindrical shape. The upper side of the reactor 1 is connected to the connecting pipe 10, and the end of the connecting pipe 10 away from the reactor 1 is connected to the pre-reactor 11. The upper ends of the pre-reactor 11 and the reactor 1 are also connected with a feeding port 12, and the pre-reactor 11 and the reactor 1 are also connected with a water inlet pipe 13 and a water outlet pipe 14 respectively. The staff adds the required two raw waters containing nitrifying bacteria and anaerobic ammonia oxidizing bacteria into the pre-reactor 11 and the reactor 1 through the feeding port 12 to denitrify the rare earth tail water. The pre-reactor 11 is connected with a sifter 2 for screening the rare earth tail water.

[0035] When in use, the rare earth tail water to be treated is injected into the pre-reactor 11, and the rare earth tail water is subjected to preliminary nitrification and denitrification treatment by the pre-reactor 11, and the sludge and mixed liquid produced by the nitrification reaction are screened by the screener 2 at the same time, and then the upper mixed liquid is introduced into the reactor 1, and the mixed liquid introduced from the pre-reactor 11 is further denitrified by anaerobic ammonia oxidation in the reactor 1, so as to achieve the effect of denitrification treatment of the rare earth tail water.

[0036] Reference Figure 2 and Figure 3 As shown, the screener 2 is used to screen the rare earth tail water; specifically, the screener 2 includes a connecting screen plate 20 connected to the inner wall of the pre-reactor 11, the connecting screen plate 20 divides the pre-reactor 11 into a sedimentation zone and a buffer zone from top to bottom, a plurality of water-permeable holes are evenly opened on the connecting screen plate 20 in a circumferential direction to connect the sedimentation zone and the buffer zone, a connecting pipe 10 is arranged on the upper side of the sedimentation zone and connected to the sedimentation zone to introduce the supernatant in the upper layer of the sedimentation zone into the reactor 1, the buffer zone is used to provide a temporary storage space for the rare earth tail water to be treated, and to reduce the impact load generated when the rare earth tail water is input, and a water inlet pipe 13 for introducing the rare earth tail water to be treated is connected to the lower side of the sedimentation zone.

[0037] It should be noted that nitrification is mainly completed by two types of autotrophic bacteria, namely nitrite bacteria and nitrifying bacteria. These bacteria oxidize ammonia nitrogen (NH4 + ) to nitrite (NO2 - ) and nitrate (NO3 - ) to obtain energy and use inorganic carbon sources (such as CO2) for growth. These bacteria usually attach to solid media (such as fillers) to form biofilms, or exist in suspended sludge in the form of flocs. As the nitrification reaction proceeds, biofilms and flocculent sludge gradually accumulate to form sludge beds or sludge flocs. These sludges are mainly composed of nitrifying bacteria and their metabolites.

[0038] Similarly, when the anaerobic ammonium oxidation reaction is carried out in the reactor 1, the microorganisms participating in the Anammox reaction grow and reproduce through metabolic activities to form biofilm or granular sludge. As the reaction proceeds, the biofilm and granular sludge gradually accumulate to form a sludge bed layer that can be separated from the sieve plate 20 connected to the reactor 1.

[0039] When in use, the rare earth tail water to be treated is injected into the pre-reactor 11, and the rare earth tail water to be treated undergoes nitrification reaction in the pre-reactor 11 for pre-denitrification treatment. In this process, the flocculent sludge particles formed in the nitrification reaction gradually settle on the connecting sieve plate 20. After the sludge particles settle on the connecting sieve plate 20, a dense sludge bed is formed. The sludge bed formed on the connecting sieve plate 20 provides a suitable living environment for the nitrifying bacteria therein, and then continues to flow into the pre-reactor through the water inlet pipe 13 at a certain rate. 11 is introduced into the rare earth tail water to be treated. During this process, the rare earth tail water in the buffer zone will pass through the sludge bed on the connecting sieve plate 20 when it is introduced into the sedimentation zone upward. The sludge bed can efficiently intercept and degrade the organic matter contained in the rare earth tail water in the prereactor 11. At the same time, when the rare earth tail water passes through the sludge bed upward, it also drives the smaller sludge particles with poor settling performance in the sludge bed to float upward, so as to avoid excessive settling of the sludge particles and cause the compaction of the sludge bed.

[0040] After completing the pretreatment of the rare earth tail water in the prereactor 11, the rare earth tail water to be treated is continuously introduced into the prereactor 11. As the water level in the sedimentation area of ​​the prereactor 11 gradually rises, after the water level moves up to the connecting pipe 10, the rare earth tail water in the upper layer of the sedimentation area naturally flows into the reactor 1 through the connecting pipe 10, and then the mixed liquid undergoes anaerobic ammonia oxidation denitrification reaction in the reactor 1, thereby completing the further denitrification effect of the rare earth tail water.

[0041] Reference Figure 2 and Figure 3 As shown, the screen 2 further includes a filter cartridge 21 with a conical opening structure connected to the connecting screen plate 20. When in use, the conical opening section on the filter cartridge 21 is used to guide the sludge particles suspended in the upper layer of the sedimentation area, so that the suspended sludge particles are guided between the connecting screen plate 20 and the filter cartridge 21. The filter cartridge 21 limits the floating range of the sludge particles suspended between the connecting screen plate 20 and the filter cartridge 21, so as to quickly improve the efficiency of the sludge particles forming a sludge bed on the connecting screen plate 20.

[0042] Furthermore, in order to avoid excessive sludge accumulation between the filter cartridge 21 and the connecting sieve plate 20, thereby causing the sludge bed layer formed between the filter cartridge 21 and the connecting sieve plate 20 to be too thick and affecting the normal denitrification treatment effect of the rare earth tail water in the pre-reactor 11, a sewage pipe 210 passing through the pre-reactor 11 is also connected to the connecting cartridge to discharge the excess sludge particles suspended in the filter cartridge 21 out of the pre-reactor 11.

[0043] Reference Figures 2 to 4As shown, in order to increase the mixing rate of nitrifying bacteria and rare earth tail water in the pre-reactor 11, thereby improving the denitrification efficiency of the rare earth tail water, a stirrer 3 for promoting the reaction efficiency is also provided in the pre-reactor 11. The stirrer 3 includes a driving rotating rod 30 and a pushing plate 31. The driving rotating rod 30 is commonly penetrated on the connecting sieve plate 20 and the pre-reactor 11. A plurality of pushing plates 31 located in the sedimentation area are evenly connected circumferentially on the driving rotating rod 30.

[0044] When in use, the driving rod 30 is driven to rotate, and after the driving rod 30 rotates, all the pushing plates 31 connected thereto are driven to rotate, and the rare earth tail water in the sedimentation zone is driven to rotate and shift by the rotation and displacement of several pushing plates 31 in the pre-reactor 11, so as to achieve the effect of making nitrifying bacteria evenly distributed in the rare earth tail water. At the same time, by rotating and shifting the rare earth tail water in the sedimentation zone, the sludge particles therein are also driven to float, which helps to maintain the suspended state of the sludge particles, prevent the excessive compaction of the sludge bed and the destruction of the sludge bed caused by the sludge expansion, thereby avoiding the problem of affecting the normal denitrification treatment of the rare earth tail water.

[0045] Reference Figure 2 and Figure 4 As shown, the reactor 1 is also provided with a connecting sieve plate 20 and a driving rotating rod 30 and a plurality of pushing plates 31 connected to the driving rotating rod 30, and a rotating plate 32 connected to the plurality of pushing plates 31 is sleeved on the driving rotating rod 30 located in the reactor 1. When in use, by driving the driving rotating rod 30 inserted in the reactor 1 to rotate, the driving rotating rod 30 rotates to drive the connected pushing plates and the rotating plates 32 to rotate in the reactor 1, thereby achieving the effect of promoting the anaerobic ammonium oxidizing (Anammox) bacteria to be evenly distributed in the rare earth tail water.

[0046] Further, refer to Figure 2 and Figure 4 As shown, the rotating plate 32 and the connecting sieve plate 20 are arranged at intervals up and down, and the diameter of the rotating plate 32 is smaller than the diameter of the connecting sieve plate 20. The rotating plate 32 and the connected pushing plates 31 are arranged corresponding to the connecting pipe 10 to reduce the fluctuation of the rare earth tail water when it enters the reactor 1 from the pre-reactor 11. When in use, when the rare earth tail water pretreated from the pre-reactor 11 enters the reactor 1, it will first flow along the connecting pipe 10 to the rotating plate 32 and the connected pushing plates 31 on the rotating plate 32, and the impact load of the rare earth tail water entering the reactor 1 will be initially reduced by the rotating plate 32 and the connected pushing plates 31.

[0047] At this time, the driving rotating rod 30 connected to the reactor 1 is driven to rotate, which will drive the rotating plate 32 and several connected pushing plates 31 to rotate. The rare earth tail water on the rotating plate 32 is driven to rotate through the rotating rotating plate 32 and any two adjacent pushing plates 31, so that the rare earth tail water applied to the rotating plate 32 has a certain centrifugal force, and flows along the end surface of the rotating plate 32 to the inner wall of the reactor 1, thereby further reducing the impact load of the rare earth tail water entering the reactor 1, and avoiding the problem that the rare earth tail water introduced into the reactor 1 causes a large impact load to affect the normal living environment of the anaerobic ammonia oxidizing (Anammox) bacteria in the reactor 1.

[0048] It should be noted that, since the bacteria required in the nitrification reaction and the anaerobic ammonium oxidation reaction require a relatively stable water environment to achieve the effect of denitrification of the water body, when driving the driving rod 30 to rotate, it is necessary to avoid controlling the rotation speed of the driving rod 30 to be too fast.

[0049] As an optional implementation, existing motor technology can also be used to drive any one of the driving rods 30 to rotate intermittently and slowly, and synchronous pulleys are connected to the two driving rods 30 on the pre-reactor 11 and the reactor 1, and a synchronous pulley is commonly connected between the two synchronous pulleys to achieve a synchronous rotation effect between the two driving rods 30.

[0050] Furthermore, a rotating plate 32 and a plurality of pushing plates 31 are also connected to the lower side of the driving rotating rod 30 located in the pre-reactor 11. When in use, the impact load generated by the rare earth tail water injected into the pre-reactor 11 acts between the rotating plate 32 and two adjacent pushing plates 31. At this time, the driving rotating rod 30 is driven to drive the rotating plate 32 and the connected plurality of pushing plates 31 to rotate, thereby effectively reducing the impact load generated by the rare earth tail water entering the pre-reactor 11.

[0051] In the process of nitrification, nitrification is mainly completed by two types of autotrophic bacteria, nitrite bacteria and nitrifying bacteria. In the process of reaction, dissolved oxygen needs to be consumed to complete the reaction. Figures 2 to 6 As shown, the pre-reactor 11 is also connected to an aeration head 4 for regulating the oxygen content of the solution in the pre-reactor 11, and the aeration head 4 includes an exhaust pipe 40, an air guide pipe 41 and an air supply member 42. The pre-reactor 11 is connected to an exhaust pipe 40 which is arranged in an annular structure and is limitedly connected to the inner wall of the pre-reactor 11. A plurality of exhaust holes for exhaust are evenly opened circumferentially on the exhaust pipe 40. The upper end of the exhaust pipe 40 is also connected to an air guide pipe 41 which passes through the pre-reactor 11 upwards. The air guide pipe 41 is connected to an air supply member 42 installed on the pre-reactor 11, and the air supply member 42 is an air compressor or an air pump.

[0052] When in use, gas is introduced into the air guide pipe 41 and the exhaust pipe 40 through the air supply member 42. After the gas is introduced into the exhaust pipe 40, it is discharged outwardly through a plurality of exhaust holes on the exhaust pipe 40 into the pre-reactor 11. After the gas is introduced into the pre-reactor 11 through the exhaust pipe 40, bubbles are formed in the water. During the rising process, the bubbles will continuously contact with the surrounding rare earth tail water mixture to increase the dissolved oxygen content in the liquid. At the same time, during the rising process, the bubbles will drive the rare earth tail water mixture to flow due to the buoyancy effect, thereby promoting the mixing of the rare earth tail water mixture and nitrifying bacteria. Aeration can also promote the release of carbon dioxide, which helps to adjust the pH value of the liquid.

[0053] Since nitrification and anaerobic ammonium oxidation are respectively an anaerobic process and an anaerobic process, Figures 4 to 8 As shown, the connecting pipe 10 is limitedly connected with a limiting sleeve 43, and a sliding connecting rod 430 is slidably inserted in the limiting sleeve 43. One end of the sliding connecting rod 430 inserted in the limiting sleeve 43 is connected with a driven block 431, and a compression spring 432 is commonly connected between the driven block 431 and the inner side wall of the limiting sleeve 43. One end of the sliding connecting rod 430 passing through the limiting sleeve 43 is connected with a blocking block 433 for closing the connecting pipe 10. In the initial state, due to the normal extension of the compression spring 432, the connected driven block 431, the sliding connecting rod 430 and the blocking block 433 are driven to slide in the direction close to the pre-reactor 11, so that the blocking block 433 slides out of the connecting pipe 10, so that the pre-reactor 11, the connecting pipe 10 and the reactor 1 are connected to each other.

[0054] When in use, by driving the blocking block 433 to slide in the direction close to the reactor 1, the movement of the blocking block 433 drives the sliding connecting rod 430 and the driven clamping block 431 to move synchronously. After the blocking block 433 is slidably inserted in the connecting pipe 10, the sealing effect of the connecting pipe 10 is completed. The connecting pipe 10 between the pre-reactor 11 and the reactor 1 is sealed by the blocking block 433, so that when the pre-reactor 11 is aerated, the pre-reactor 11 and the reactor 1 are isolated from each other, preventing the oxygen entering the pre-reactor 11 from entering the reactor 1 through the connecting pipe 10 in large quantities, thereby affecting the normal living environment conditions of the anaerobic ammonia oxidation (Anammox) bacteria in the reactor 1, and further affecting the operation of the rare earth tail water denitrification treatment.

[0055] Reference Figures 4 to 6 As shown, one end of the blocking block 433 away from the limiting sleeve 43 abuts against a guide push block 434, a side of the guide push block 434 close to the blocking block 433 is set as an inclined surface, and one end of the guide push block 434 away from the blocking block 433 is provided with a connecting lever 435 connected to the air guide tube 41.

[0056] Further, refer to Figure 4 and Figure 5 As shown, in order to seal the connecting pipe 10 while aerating the rare earth tail water in the pre-reactor 11, a guide sleeve 44 connected to the pre-reactor 11 is sleeved on the outer side surface of the air guide connecting pipe 41, and a limit block 440 slidingly fitted with the inner wall of the guide sleeve 44 is sleeved on the outer side surface of the air guide connecting pipe 41. When in use, the gas introduced into the guide sleeve 44 through the air supply part 42 has a certain downward driving force, pushing the limit block 440 and the air guide pipe 41 in the guide sleeve 44 downward, and the downward movement of the air guide pipe 41 drives the connecting rod 435 and the guide push block 434 to move downward. After the guide push block 434 moves downward and conflicts with the blocking block 433, as the guide push block 434 continues to move downward, the blocking block 433 is driven to slide in the direction close to the reactor 1 through the inclined surface on the guide push block 434 until the blocking block 433 is inserted into the connecting pipe 10 to close the connecting pipe 10. At this time, the compression spring 432 is compressed by the force, thereby achieving the closure of the connecting pipe 10 while aerating the pre-reactor 11, so that the pre-reactor 11 and the reactor 1 are no longer connected.

[0057] After aeration is completed, the gas supply component 42 stops outputting gas, and the downward driving force on the limit block 440 and the gas guide pipe 41 is released. At this time, the pressure spring 432 is compressed and needs to be restored to a normal extended state. The pressure spring 432 restores its extension and drives the driven block 431, the sliding connecting rod 430 and the blocking block 433 to slide toward the side close to the pre-reactor 11, so that the blocking block 433 slides out of the connecting pipe 10 to release the sealing state of the connecting pipe 10, thereby restoring the interconnection state between the pre-reactor 11, the connecting pipe 10 and the reactor 1.

[0058] Reference Figures 4 to 6 As shown, the outer side surface of the exhaust pipe 40 is symmetrically connected to a limit slide block 45 inserted on the inner wall of the pre-reactor 11, and a limit slide groove 450 adapted to the limit slide block 45 is correspondingly opened on the inner wall of the pre-reactor 11. The limit slide block 455 is slidably inserted in the limit slide groove 450, and is limited by the connected limit slide groove 450 to only allow sliding in the vertical direction along the limit slide groove 450.

[0059] Furthermore, the exhaust pipe 40 is arranged to be in a state of sliding fit with the inner wall of the pre-reactor 11, and because it takes a certain amount of time to consume the dissolved oxygen in the water during the nitrification reaction, the limit slider 45 is arranged to be made of a flexible material that allows a certain amount of deformation, and the limit slider 45 is inserted into the limit slide groove 450 after being squeezed and deformed.

[0060] During specific use, when the air guide pipe 41 and the exhaust pipe 40 are driven downward by the air supply component 42, the downward movement of the exhaust pipe 40 drives all the connected limit sliders 45 to move downward along the limit slide groove 450. The limit slide groove 450 limits the limit slider 45, and the limit slider 45 limits the exhaust pipe 40, so as to achieve the effect of limiting the sliding path of the exhaust pipe 40, and at the same time, limit the rotational displacement of the air guide pipe to avoid driving the connecting lever 435 and the guide push block 434 to rotate and shift, thereby avoiding the problem of misalignment between the guide push block 434 and the blocking block 433.

[0061] After the air supply part 42 stops supplying air, since the exhaust pipe 40 is placed in the rare earth tail water in the pre-reactor 11, the exhaust pipe 40 has a certain upward buoyancy in the rare earth tail water. Under the cooperation of the elastic restoring force of the compressed spring 432, the effect of driving the air guide pipe 41, the connecting rod 435 and the guide push block 434 to move up and reset is achieved. At this time, since the limiting slider 45 is squeezed and deformed and slides against the inner wall of the limiting slide groove 450, the friction between the limiting slider 45 and the limiting slide groove 450 is increased, thereby achieving the effect of delaying the upward movement rate of the exhaust pipe 40, the air guide pipe 41, the connecting rod 435 and the guide push block 434, delaying the mutual connection between the pre-reactor 11 and the reactor 1, and preventing the rare earth tail water with a high dissolved oxygen content in the pre-reactor 11 from entering the reactor 1.

[0062] Reference Figure 4 As shown, in order to improve the quality of denitrification treatment of rare earth tail water to be treated, an extraction pump 5 is also connected to the outer surface of the lower end of the reactor 1, and the output end of the extraction pump 5 is connected to a reflux pipe 50 connected to the pre-reactor 11, so that the rare earth tail water treated in the reactor 1 is re-injected into the pre-reactor 11 for further denitrification treatment, and the water quality in the outlet pipe 14 is detected by external equipment and the outlet pipe 14 is closed at the same time. After the water quality in the outlet pipe 14 is tested to be qualified, the qualified water is discharged. The rare earth tail water treated in the reactor 1 is intermittently and reciprocally injected into the pre-reactor 11 for treatment by the extraction pump 5 to achieve the effect of improving the denitrification treatment effect of the rare earth tail water. After completing multiple cycles of denitrification treatment of the rare earth tail water, the water quality in the outlet pipe 14 is detected by external equipment. After meeting the standard, it is discharged, otherwise it is continuously extracted by the extraction pump 5 into the pre-reactor 11 for treatment, and the cycle is repeated until qualified water is obtained.

[0063] It should be noted that, since sludge beds are formed on the connecting sieve plates 20 in the pre-reactor 11 and the reactor 1, respectively, the nitrifying bacteria and anaerobic ammonia oxidizing bacteria therein will gather near the sludge beds on the connecting sieve plates 20 to denitrify the rare earth tail water in the pre-reactor 11 and the reactor 1. Therefore, as an optional embodiment, by controlling the rate of injecting the rare earth tail water to be treated into the pre-reactor 11 and by controlling the extraction interval and rate of the rare earth tail water treated in the reactor 1 by the extraction pump 5, the rate of the rare earth tail water rising in the pre-reactor 11 and moving downward in the reactor 1 is controlled, that is, the time length of the rare earth tail water in the pre-reactor 11 and the reactor 1 where the nitrifying bacteria and anaerobic ammonia oxidizing bacteria gather is controlled (that is, the reaction time between the rare earth tail water and the nitrifying bacteria and between the rare earth tail water and the anaerobic ammonia oxidizing bacteria).

[0064] Under this embodiment, while effectively reducing the impact load generated when the input rare earth tail water is injected into the pre-reactor 11, it also avoids the problem of strictly controlling the ratio of ammonia nitrogen to nitrite (NH3-N / NO2--N) in the pre-reactor 11 and the reactor 1, thereby achieving effective removal of ammonia nitrogen and total nitrogen. After the rare earth tail water treated in the reactor 1 is injected into the pre-reactor 11 in a reciprocating cycle through the extraction pump 5, a certain amount of organic carbon source can be supplemented in the pre-reactor 11 to reduce the need to add an organic carbon source to the pre-reactor 11.

[0065] During operation: the first step is to introduce rare earth tail water into the pre-reactor 11, and to perform preliminary nitrification reaction on the rare earth tail water in the pre-reactor 11 in advance, so as to perform preliminary denitrification treatment on the rare earth tail water.

[0066] Step 2: After the rare earth tail water is preliminarily denitrified by the pre-reactor 11, the treated rare earth tail water is introduced into the reactor 1 to perform anaerobic ammonia oxidation reaction, thereby completing the secondary denitrification effect on the rare earth tail water.

[0067] Step 3: The rare earth tail water treated in the reactor 1 is re-introduced into the pre-reactor 11 through the extraction pump 5 to perform nitrification reaction again, and then the rare earth tail water treated in the pre-reactor 11 is introduced into the reactor 1 for anaerobic ammonia oxidation reaction, and this process is repeated until the water quality meets the standard.

[0068] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0069] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An anaerobic ammonium oxidation denitrification device suitable for rare earth tail water, comprising a reactor (1), characterized in that: The reactor (1) is hollow inside and is arranged in a cylindrical shape. The reactor (1) is connected to a connecting pipe (10). The end of the connecting pipe (10) away from the reactor (1) is connected to a pre-reactor (11). The pre-reactor (11) is connected to a sieve (2) for sieving rare earth tail water, wherein: The screener (2) comprises a connecting sieve plate (20) connected to the inner wall of the pre-reactor (11), the connecting sieve plate (20) divides the pre-reactor (11) into a sedimentation zone and a buffer zone from top to bottom, the connecting pipe (10) is arranged on the upper side of the sedimentation zone and is connected to the sedimentation zone to introduce the supernatant in the upper layer of the sedimentation zone into the reactor (1), and the buffer zone is used to provide a temporary storage space for the rare earth tail water to be treated and to reduce the impact load generated when the rare earth tail water is input.

2. The anaerobic ammonium oxidation denitrification device suitable for rare earth tail water according to claim 1, characterized in that: The sieve (2) further comprises a filter cartridge (21) connected to the sieve plate (20) and having a conical opening structure.

3. The anaerobic ammonium oxidation denitrification device suitable for rare earth tail water according to claim 1, characterized in that: The pre-reactor (11) is also provided with an agitator (3) for promoting reaction efficiency. The agitator (3) comprises a driving rotating rod (30) which is connected to the sieve plate (20) and is passed through the pre-reactor (11). The driving rotating rod (30) is evenly connected to a plurality of pushing plates (31) located in the precipitation zone in a circumferential direction.

4. The anaerobic ammonium oxidation denitrification device suitable for rare earth tail water according to claim 1, characterized in that: The reactor (1) is also provided with a connection plate (20) and a driving rotating rod (30) and a plurality of pushing plates (31) connected to the driving rotating rod (30). The driving rotating rod (30) in the reactor (1) is also provided with a rotating plate (32) connected to the plurality of pushing plates (31).

5. The anaerobic ammonium oxidation denitrification device suitable for rare earth tail water according to claim 4, characterized in that: The rotating plate (32) and the connecting sieve plate (20) are arranged with a vertical interval, and the diameter of the rotating plate (32) is smaller than the diameter of the connecting sieve plate (20). The rotating plate (32) and a plurality of connected pushing plates (31) are arranged corresponding to the connecting pipe (10) to reduce the fluctuation of the rare earth tail water when it enters the reactor (1) from the pre-reactor (11).

6. The anaerobic ammonium oxidation denitrification device suitable for rare earth tail water according to claim 1, characterized in that: The pre-reactor (11) is also connected to an aeration head (4) for regulating the dissolved oxygen content in the pre-reactor (11). The aeration head (4) comprises an exhaust pipe (40) connected to the pre-reactor (11) and arranged in an annular structure and limitedly connected to the inner wall of the pre-reactor (11). A plurality of exhaust holes for exhaust are evenly arranged circumferentially on the exhaust pipe (40). The upper end of the exhaust pipe (40) is also connected to an air guide pipe (41) that passes through the pre-reactor (11) upwards. The air guide pipe (41) is connected to an air supply component (42) installed on the pre-reactor (11).

7. The anaerobic ammonium oxidation denitrification device suitable for rare earth tail water according to claim 6, characterized in that: The connecting tube (10) is limitedly connected to a limiting sleeve (43), a sliding connecting rod (430) is inserted into the limiting sleeve (43), one end of the sliding connecting rod (430) inserted into the limiting sleeve (43) is connected to a driven clamping block (431), a compression spring (432) is commonly connected between the driven clamping block (431) and the inner side wall of the limiting sleeve (43), and one end of the sliding connecting rod (430) passing through the limiting sleeve (43) is connected to a blocking block (433) for closing the connecting tube (10).

8. The anaerobic ammonium oxidation denitrification device suitable for rare earth tail water according to claim 7, characterized in that: One end of the blocking block (433) away from the limiting sleeve (43) abuts against a guide push block (434), and one end of the guide push block (434) away from the blocking block (433) is provided with a connecting lever (435) connected to the air guide pipe (41).

9. The anaerobic ammonium oxidation denitrification device suitable for rare earth tail water according to claim 8, characterized in that: The outer side surface of the gas guide connecting pipe (41) is sleeved with a guide sleeve (44) connected to the pre-reactor (11), and the outer side surface of the gas guide connecting pipe (41) is sleeved with a limit block (440) that fits with the inner side wall of the guide sleeve (44).

10. The anaerobic ammonium oxidation denitrification device suitable for rare earth tail water according to claim 1, characterized in that: An extraction pump (5) is connected to the outer side surface of the lower end of the reactor (1), and the output end of the extraction pump (5) is connected to a reflux pipe (50) connected to the pre-reactor (11) so as to re-inject the rare earth tail water treated in the reactor (1) into the pre-reactor (11) for further denitrification treatment.

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