Sulfur autotrophic denitrification-based sewage treatment system capable of recycling sulfur

Abstract

The invention relates to the field of sewage treatment, in particular to a sewage treatment system capable of recycling sulfur based on sulfur autotrophic denitrification, which comprises a pretreatment tank, an aerobic tank, a sulfur autotrophic denitrification reactor, an anaerobic tank and a secondary sedimentation tank which are sequentially connected, and the part of the secondary sedimentation tank containing supernatant mixed liquor is communicated with the aerobic tank; the anaerobic tank contains sulfate reducing bacteria, and sulfate radicals (SO4 < 2->) in the sewage discharged from the sulfur autotrophic denitrification reactor are reduced into S < 2-> by the anaerobic tank under the action of the sulfate reducing bacteria; water containing S < 2-> in the anaerobic tank enters a secondary sedimentation tank, and supernatant mixed liquor in the secondary sedimentation tank flows back to the aerobic tank; sulfur oxidizing bacteria are contained in the aerobic tank, and S < 2-> in the liquid flowing back from the secondary sedimentation tank is oxidized into S < 0 > and S2O3 < 2-> by the aerobic tank under the action of the sulfur oxidizing bacteria. According to the scheme, the problem that more SO4 < 2-> is generated in the current sulfur autotrophic denitrification process is solved, meanwhile, the consumption of electron donors is reduced, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a sewage treatment system capable of utilizing sulfur resources based on sulfur autotrophic denitrification. Background Art

[0002] Sulfur autotrophic microorganisms in anaerobic or anoxic environments use inorganic carbon (CO3 2- 、HCO3 - ) as a carbon source, and by adding electron donors, nitrite (NO2 - -N) or nitrate (NO3 - The process of reducing sulfur-containing materials to N2 is called sulfur autotrophic denitrification. Sulfur autotrophic denitrification technology has been widely used in the treatment of urban sewage, industrial wastewater, nitrate-contaminated surface water and groundwater, and drinking water.

[0003] In the process of sulfur autotrophic denitrification, no matter what electron donor is used, a considerable amount of sulfate (SO4 2- ), especially when treating wastewater with high concentration of ammonia nitrogen (1185-1334 mg / L), its SO4 2- The amount produced can reach 4682mg / L. However, my country has not yet clearly stipulated SO4 2- The emission standards for SO4 are only specified in the "Sanitary Standard for Drinking Water" (GB5749-2006). 2- The emission limit is 250 mg / L, and most studies tend to ignore SO4 2- Pollution problem. However, if the high concentration of SO4 2- If it is completely discharged directly into the receiving water body, it will inevitably cause serious pollution to the ecological environment of the water body. 2- Although unified treatment before discharge will reduce pollution to the water ecological environment, it will significantly increase SO4 2- processing costs. Summary of the invention

[0004] The present invention is intended to provide a wastewater treatment system based on sulfur autotrophic denitrification that can utilize sulfur as a resource, so as to solve the problem that the current sulfur autotrophic denitrification process produces a lot of SO4 2- Problems, mitigation of SO4 2- pollution, while reducing the consumption of electron donors and lowering costs.

[0005] To achieve the above object, the present invention adopts the following technical scheme: a wastewater treatment system based on sulfur autotrophic denitrification capable of utilizing sulfur resources, comprising a pretreatment tank, a sulfur autotrophic denitrification reactor and a secondary sedimentation tank, and also comprising an aerobic tank and an anaerobic tank, wherein the aerobic tank is connected and located between the pretreatment tank and the sulfur autotrophic denitrification reactor, the anaerobic tank is connected and located between the sulfur autotrophic denitrification reactor and the secondary sedimentation tank, and the part of the secondary sedimentation tank containing the supernatant mixed liquid is connected to the aerobic tank; The anaerobic pool contains sulfate-reducing bacteria, which use the sulfate-reducing bacteria to reduce SO4 in the wastewater discharged from the sulfur autotrophic denitrification reactor. 2- Restore to S 2- ; The anaerobic tank contains S 2- The water enters the secondary sedimentation tank, and the supernatant mixed liquid in the secondary sedimentation tank flows back into the aerobic tank; The aerobic pool contains sulfur oxidizing bacteria, which use the sulfur oxidizing bacteria to remove sulfur from the liquid flowing back from the secondary sedimentation tank. 2- Oxidized to S0 or S2O3 2- , S0 or S2O3 2- The liquid continues to enter the sulfur autotrophic denitrification reactor.

[0006] The principle and advantages of this scheme are: the sewage in this application scheme first enters the pretreatment tank for pretreatment to settle the large particles in the sewage. Then the sewage enters the aerobic tank, where the sewage undergoes nitrification reaction, NH4 + -N is converted to NO3 - -N, while removing most of the organic matter in the sewage, avoiding heterotrophic denitrification in the sulfur autotrophic denitrification reactor. Then the water in the aerobic pool flows to the sulfur autotrophic denitrification reactor, which is filled with fillers. The denitrifying Thiobacillus in the sulfur autotrophic denitrification reactor uses NO3 - -N is the electron acceptor, and S0 in the filler is the electron donor, and autotrophic denitrification occurs to convert NO3 - -N is converted to N2 and SO4 is produced 2- Then, after sulfur autotrophic denitrification treatment, it contains S04 2- The water enters the anaerobic tank, which uses sulfate-reducing bacteria to reduce SO4 2- Restore to S 2- Then containing S 2- The liquid from the anaerobic tank enters the secondary sedimentation tank, and the liquid containing the supernatant mixed liquid in the secondary sedimentation tank flows back into the aerobic tank, where the sulfur oxidizing bacteria in the aerobic tank convert S 2- Oxidized to S0, S203 2- , and continue to enter the sulfur autotrophic denitrification reactor to oxidize the S0 and S203 generated in the aerobic tank 2-It is used as an electron donor for denitrification, thereby realizing the recycling of part of the sulfur element in the entire sewage treatment system.

[0007] Therefore, the inventive concept of the present application is to use an anaerobic tank to remove SO4 2- Restore to S 2- , realizing the SO4 2- The consumption of S is then reduced through the secondary sedimentation tank. 2- The liquid is returned to the aerobic tank, thereby removing S from the liquid. 2- Oxidized to S0, S2O3 2- , S0, S2O3 2- The liquid continues to enter the sulfur autotrophic denitrification reactor and participates in the reaction, thereby replenishing electron donors in the sulfur autotrophic denitrification reactor, which is beneficial to reducing the consumption of electron donors. In this way, through the present application scheme, not only the production of SO4 2- The utilization of 2- emissions, alleviating SO4 2- It can reduce pollution, reduce the consumption of electron donors, and reduce the cost of sewage treatment (such as the cost of electron donors).

[0008] Preferably, as an improvement, the aerobic pool contains an oxygenation component, the oxygenation component includes a horizontal axis and a plurality of oxygenation blades located on the horizontal axis, the plurality of oxygenation blades are arranged and distributed along the length direction of the horizontal axis, the length of the plurality of oxygenation blades gradually decreases from the pretreatment tank to the sulfur autotrophic denitrification reactor, a plurality of air outlets are provided on the oxygenation blades, an air inlet is provided on the horizontal axis, the air inlet is connected to an air inlet pipe, gas chambers are provided inside the horizontal axis and inside the oxygenation blades, and the gas chamber inside the horizontal axis is connected to the gas chamber inside the oxygenation blades.

[0009] Thus, oxygen is introduced into the horizontal axis through the air inlet pipe, the oxygen enters the gas chamber inside the horizontal axis and the gas chamber inside the oxygenating blades, and the oxygen flows out from the air outlet holes of different oxygenating blades, thereby achieving oxygenation of different parts in the aerobic pool, so that there is a certain amount of oxygen in the aerobic pool.

[0010] The reason why the length of the multiple oxygenating blades is set to gradually decrease from the pretreatment tank to the sulfur autotrophic denitrification reactor in the present application is that such a setting can make the farther away from the sulfur autotrophic denitrification reactor, the longer the length of the oxygenating blade, the more oxygen will emerge from the oxygenating blade, and the more oxygen will be around the oxygenating blade, and the closer to the sulfur autotrophic denitrification reactor, the shorter the length of the oxygenating blade, the less oxygen will emerge from the oxygenating blade, and the less oxygen will be around the oxygenating blade. In this way, the distribution of oxygen emerging in the aerobic pool gradually decreases from the pretreatment tank to the sulfur autotrophic denitrification reactor, avoiding the situation that the oxygen emerging from the part of the aerobic pool close to the sulfur autotrophic denitrification reactor is more, so that the effluent of the aerobic pool brings in more oxygen after entering the sulfur autotrophic denitrification reactor, which has a certain damage to the anoxic environment of the sulfur autotrophic denitrification reactor, and avoiding the situation that the sulfur autotrophic denitrification reactor becomes heterotrophic denitrification after the oxygen in the sulfur autotrophic denitrification reactor is more, thereby ensuring that the sulfur autotrophic denitrification is carried out smoothly.

[0011] Preferably, as an improvement, the horizontal axis is rotatably connected to the aerobic tank, and a driving mechanism for driving the horizontal axis to rotate is provided outside the aerobic tank; the oxygenating blades rotate to push the liquid toward the sulfur autotrophic denitrification reactor.

[0012] Therefore, the horizontal axis is driven to rotate by the driving mechanism, and the horizontal axis drives the oxygenation blades to rotate. In this way, the rotation of the oxygenation blades first realizes the stirring of the liquid in the vertical direction, which is beneficial to the uniform distribution of oxygen in the vertical direction.

[0013] Secondly, the oxygenating blades rotate and push the liquid toward the sulfur autotrophic denitrification reactor, which is similar to the principle that the paddle blades of a ship rotate in the water to push the liquid to flow away from the paddle blades. The liquid flows toward the sulfur autotrophic denitrification reactor, thereby driving part of the oxygen to diffuse toward the sulfur autotrophic denitrification reactor, thereby supplementing the oxygen in the aerobic pool toward the sulfur autotrophic denitrification reactor, and alleviating the situation where the oxygenating blades in the aerobic pool near the sulfur autotrophic denitrification reactor are shorter, resulting in less oxygen in the aerobic pool near the sulfur autotrophic denitrification reactor.

[0014] In summary, by using the oxygenation component in the present application, the length of the oxygenation component decreases gradually toward the direction close to the sulfur autotrophic denitrification reactor, which makes the lateral distribution of oxygen in the aerobic tank show a decreasing trend as a whole, avoiding the situation where there is more oxygen in the aerobic tank near the sulfur autotrophic denitrification reactor. At the same time, the rotation of the oxygenation blades makes part of the oxygen diffuse laterally toward the sulfur autotrophic denitrification reactor, avoiding the situation where there is less oxygen in the aerobic tank near the sulfur autotrophic denitrification reactor due to the shorter oxygenation blades.

[0015] Preferably, as an improvement, a plurality of partitions for separating laterally adjacent oxygenating blades are fixedly connected in the aerobic pool, and the top and bottom of the aerobic pool are laterally connected.

[0016] Thus, the partition separates the oxygenating blades adjacent to each other in the horizontal direction, and the partition has an obstructive effect on the horizontal diffusion of the oxygen emitted from the oxygenating blades, so that the rapid horizontal diffusion of the oxygen emitted from the oxygenating blades has resistance, ensuring that the oxygen emitted from the oxygenating blades can be dispersed vertically first and quickly form an oxygen distribution ladder. The top and bottom of the aerobic pool are both horizontally connected, so that the top or bottom of the partition will not affect the horizontal flow of the liquid.

[0017] Preferably, as an improvement, the height of the partition gradually decreases from the pretreatment tank to the sulfur autotrophic denitrification reactor. Thus, the length of the partition is adapted to the change in the length of the oxygenation blades, because the longer oxygenation blades require a vertically longer partition to separate them, while the shorter oxygenation blades do not need a vertically longer partition due to the small vertical stirring range, so the setting of the partition can be gradually reduced.

[0018] Preferably, as an improvement, the partitions are provided with transverse liquid holes. The provision of the liquid holes prevents the partitions from completely blocking the transverse flow of the liquid, and ensures that a certain amount of liquid and oxygen can flow transversely through the liquid holes.

[0019] Preferably, as an improvement, the front and rear ends of the partition are fixedly connected to the front and rear inner walls of the aerobic tank, so that the bottom or top of the partition will not be fixed to the aerobic tank, thereby avoiding the bottom or top of the partition from hindering the lateral flow of the liquid.

[0020] Preferably, as an improvement, the oxygenation blades are spiral or obliquely arranged on the horizontal axis. Thus, the rotation of the oxygenation blades can give the liquid a lateral thrust.

[0021] Preferably, as an improvement, the driving mechanism includes a driving motor, a driving gear and a driven gear, the driving motor and the driving gear are coaxially fixed, the driven gear and the transverse axis are coaxially fixed, and the driving gear and the driven gear are meshed. Thus, the driving motor drives the driving gear to rotate, the driving gear drives the driven gear to rotate, and the driven gear drives the transverse axis to rotate.

[0022] Preferably, as an improvement, the sulfur autotrophic denitrification reactor comprises a vertical tank body, a water inlet is provided at the bottom of the tank body, a water inlet pipe is connected to the water inlet, a reflux pipe is connected to the tank body, the lower end of the reflux pipe is connected to the water inlet, the high end of the reflux pipe is connected to a water absorbing member, the water absorbing member is located inside the tank body and divides the inner part of the tank body into a clear water area above the water absorbing member and a fluidizing area below the water absorbing member, a circulating pump is provided on the reflux pipe, a plurality of vertically arranged water outlet members are provided in the fluidizing area, a plurality of liquid outlet holes are provided on the water outlet members, and the water outlet members are all connected to the reflux pipe; the liquid sucked in by the water absorbing member enters the water inlet and each water outlet member through the reflux pipe.

[0023] In the prior art, NO3 - -N sewage passes through the aerobic tank and enters the water inlet through the water inlet pipe. The sewage flows out of the water inlet and flows upward in the tank body. The sewage and SO undergo sulfur autotrophic denitrification in the fluidized area. The purified water is located in the clear water area at the top of the tank body. The circulating pump sucks the water at the top of the fluidized area into the return pipe. The liquid in the return pipe flows into the water inlet and sprays out from the water inlet, thereby realizing the circulation of water. The water sprays upward from the water inlet at an angle. The water supply has an upward impact force and tangential force. At the same time, the return pipe absorbs water from the top of the fluidized area, and the water at the top of the fluidized area flows into the return pipe. In this way, the filler is distributed more evenly and dispersed under the impact force of the water at the bottom of the tank body and the suction force of the water at the top of the fluidized area, which reduces the sinking of the filler and enhances the fluidization effect of the fluidized area, so that SO and sewage are fully mixed and contacted, and the sulfur autotrophic denitrification reaction is more thorough.

[0024] Since the bottom of the fluidized zone is subject to the upward impact of the water inlet and the top of the fluidized zone is subject to the suction of the reflux pipe, both the top and bottom of the fluidized zone are subject to force. However, the middle of the fluidized zone is calmer and gentler than the top and bottom of the fluidized zone, which is not conducive to the full mixing reaction of S0 and water, and the fluidization effect in the middle of the fluidized zone is poor.

[0025] To this end, the present application improves the sulfur autotrophic denitrification reactor, and the circulating pump sucks the water at the top of the fluidized zone into the reflux pipe through the water absorption piece, and flows into the water inlet, and sprays out from the water inlet, thereby realizing the circulation of water. The water absorbed into the reflux pipe by the water absorption piece and the water in the water inlet pipe are sprayed upward from the water inlet obliquely. Compared with the case where only the water in the water inlet pipe is sprayed upward from the water inlet obliquely, the amount of water sprayed upward from the water inlet obliquely is greater, and the upward impact force on the liquid in the fluidized zone is greater, which is conducive to the upward flow of water in the fluidized zone, so that the water and the filler are fully mixed, thereby helping to improve the fluidization effect of the fluidized zone.

[0026] At the same time, the return pipe absorbs water from the top of the fluidized zone, and the water at the top of the fluidized zone flows into the return pipe. The top of the fluidized zone has an upward suction force on the water, which is beneficial to the upward flow of water in the fluidized zone, so that SO2 and sewage can be mixed better, reducing the sinking of SO2 and improving the fluidization effect.

[0027] In addition, since the water outlet parts are all connected to the return pipe, the liquid that enters the return pipe from the water absorption part also enters the water outlet parts at different heights, and the liquid flows out from the water outlet parts at different heights. The liquid flowing out of the water outlet parts can impact the liquid at different heights, so that the positions at different heights in the middle of the fluidizing zone can also be affected by the impact force and are no longer relatively calm, which is beneficial to the mixed contact of water and filler in the middle of the fluidizing zone. Compared with the phenomenon in the prior art that only the top and bottom of the fluidizing zone are subjected to greater force and the middle of the fluidizing zone is subjected to weaker force, the problem of poor fluidization effect in the middle of the fluidizing zone is solved, and the fluidization effect in the middle of the fluidizing zone is improved.

[0028] In summary, through the above scheme, liquid is sprayed upward at an angle through the water inlet outlet to impact and swirl the liquid at the bottom of the fluidized zone, the water absorbing member absorbs liquid from the top of the fluidized zone and has suction on the liquid, and the water outlet member impacts the liquid at different heights in the fluidized zone, so that different parts of the entire fluidized zone are basically subjected to force and are no longer calm and relaxed, thereby greatly improving the overall fluidization effect of the entire fluidized bed reaction zone, and realizing a more sufficient and thorough sulfur autotrophic denitrification reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of a sewage treatment system that can utilize sulfur resources based on sulfur autotrophic denitrification.

[0030] Figure 2 This is a cross-sectional view of an aerobic pool.

[0031] Figure 3 It is a structural schematic diagram of a fluidized bed reactor for sewage treatment.

[0032] Figure 4 for Figure 3 A is an enlarged view of the middle image.

[0033] Figure 5 for Figure 3 Top view of the middle suction pipe.

[0034] Figure 6 for Figure 3 Top view of the middle water outlet.

[0035] Figure 7 This is a top view of the water outlet part in the tank body in Example 7. DETAILED DESCRIPTION

[0036] The following is further described in detail through specific implementation methods: The figure marks in the drawings of the specification include: tank body 1, base 2, water inlet pipe 3, water inlet 4, filler 5, fluidized area 6, clean water area 7, water outlet branch pipe 8, reflux pipe 9, circulation pump 10, connecting pipe 11, drainage branch pipe 12, sampling pipe 13, sampling box 14, drainage main pipe 15, first valve 16, branch pipe 17, water absorption part 18, third valve 19, second valve 20, water suction port 21, water outlet main pipe 22, driven sprocket 23, chain 24, driving sprocket 25, pretreatment tank 26, aerobic tank 27, horizontal axis 271, partition 272, oxygenation blade 273, liquid through hole 274, driven gear 275, air inlet pipe 276, air outlet hole 278, liquid inlet pipe 279, liquid outlet pipe 280, sulfur autotrophic denitrification reactor 28, anaerobic tank 29, secondary sedimentation tank 30, water inlet pump 31.

[0037] Example 1 Basically as attached Figure 1 As shown: This embodiment discloses a wastewater treatment system based on sulfur autotrophic denitrification that can utilize sulfur resources, including a pretreatment tank 26, a sulfur autotrophic denitrification reactor 28 and a secondary sedimentation tank 30, and also includes an aerobic tank 27 and an anaerobic tank 29. The pretreatment tank 26, the aerobic tank 27, the sulfur autotrophic denitrification reactor 28, the anaerobic tank 29 and the secondary sedimentation tank 30 are connected from left to right in sequence, wherein the bottom of the aerobic tank 27 is connected to the water inlet at the bottom of the sulfur autotrophic denitrification reactor 28, and the top of the sulfur autotrophic denitrification reactor 28 is connected to the top of the anaerobic tank 29. The top part of the secondary sedimentation tank 30 containing the supernatant mixed liquid is connected to the aerobic tank 27 ( Figure 1 The above-mentioned connection method in this embodiment can be specifically connected through a pipeline. A water inlet pump 31 is provided on the left side of the pretreatment tank 26, and sewage can be pumped into the pretreatment tank 26 through the water inlet pump 31. A pipeline is connected between the bottom of the secondary sedimentation tank 30 and the anaerobic tank 29, and a part of the sludge at the bottom of the secondary sedimentation tank 30 can be returned to the anaerobic tank 29 through the pipeline, and a part of the sludge at the bottom of the secondary sedimentation tank 30 is discharged.

[0038] The anaerobic pool 29 in this embodiment contains sulfate-reducing bacteria. The total colony count of sulfate-reducing bacteria in this embodiment is about 2.66×10 9 CFU / ml, and when treating different sewage, the total colony count of sulfate-reducing bacteria can be appropriately changed. The anaerobic tank 29 uses the sulfate-reducing bacteria to reduce SO4 in the sewage discharged from the sulfur autotrophic denitrification reactor 28. 2- Restore to S 2- ; Anaerobic tank 29 contains S 2-The water enters the secondary sedimentation tank 30, and the supernatant mixed liquid at the top of the secondary sedimentation tank 30 flows back into the aerobic tank 27. In order to make the liquid flow back from the top of the secondary sedimentation tank 30 to the aerobic tank 27 more smoothly, a reflux pump is provided on the reflux pipeline between the top of the secondary sedimentation tank 30 and the aerobic tank 27; The aerobic pool 27 contains sulfur oxidizing bacteria. The total colony count of sulfur oxidizing bacteria in this embodiment is about 5.20×10 9 CFU / ml, and when treating different sewage, the total colony count of sulfur-oxidizing bacteria can be appropriately changed. The anaerobic tank 27 uses the sulfur-oxidizing bacteria to remove sulfur from the liquid returned from the secondary sedimentation tank 30. 2- Oxidized to S0, S2O3 2- , S0, S2O3 2- The liquid continues to flow rightward and enters the sulfur autotrophic denitrification reactor 28 .

[0039] The specific implementation process is as follows: the sewage in this embodiment first enters the pretreatment tank 26 through the water inlet pump 31 for pretreatment, and the large particles in the sewage are settled. Then the sewage enters the aerobic tank 27, which is filled with oxygen, and the sewage undergoes nitrification reaction in the aerobic tank 27, and the NH4 + -N is converted to NO3 - -N, while removing most of the organic matter in the sewage, avoiding heterotrophic denitrification reaction in the sulfur autotrophic denitrification reactor 28. Then the water in the aerobic tank 27 flows to the sulfur autotrophic denitrification reactor 28, which is filled with fillers (such as sulfur powder), and the sewage undergoes sulfur autotrophic denitrification reaction in the sulfur autotrophic denitrification reactor 28. The denitrifying Thiobacillus in the sulfur autotrophic denitrification reactor 28 uses NO3 - -N is the electron acceptor, and S0 in the filler is the electron donor, and autotrophic denitrification occurs to convert NO3 - -N is converted to N2, and some SO4 is produced 2- In this embodiment, the treatment of high-concentration ammonia nitrogen (1185-1334 mg / L) wastewater is used as an example to illustrate the NO3 generated by the nitrification reaction of ammonia nitrogen in the aerobic tank 27. - -N concentration is as high as 1063-1244 mg / L, and then the SO4 produced after being treated by sulfur autotrophic denitrification reactor 28 2- The average concentration is 4682 mg / L. Then, after sulfur autotrophic denitrification treatment, it contains S04 2- The water enters the anaerobic tank 29, which uses sulfate-reducing bacteria to reduce SO4 2- Restore to S 2- Then containing S 2-The liquid from the anaerobic tank 29 enters the secondary sedimentation tank 30, and the liquid in the part of the secondary sedimentation tank 30 containing the supernatant mixed liquid flows back into the aerobic tank 27, and the sulfur-oxidizing bacteria in the aerobic tank 27 convert the re-entered S 2- Oxidized to S0, S203 2- , and continue to the right to enter the sulfur autotrophic denitrification reactor 28 to oxidize the SO and S2O3 generated in the aerobic tank 27. 2- It is used as an electron donor for denitrification, thereby realizing the recycling of part of the sulfur element in the entire sewage treatment system and reducing SO4 2- emissions.

[0040] Example 2 In Example 1, the aerobic pool 27 is filled with oxygen, while the sulfur autotrophic denitrification reactor 28 does not need oxygen during the reaction, and the interior of the sulfur autotrophic denitrification reactor 28 is an anoxic environment. However, when the aerobic pool 27 is filled with more oxygen, more oxygen will be brought into the process of the liquid flowing from the aerobic pool 27 to the sulfur autotrophic denitrification reactor 28, thereby damaging the anoxic environment of the sulfur autotrophic denitrification reactor 28 to a certain extent, which is not conducive to the sulfur autotrophic denitrification reaction in the sulfur autotrophic denitrification reactor 28, but heterotrophic denitrification reaction will occur.

[0041] Therefore, in order to solve this problem, this embodiment is further improved on the basis of Embodiment 1. In this embodiment, the aerobic pool 27 (the left side of the aerobic pool 27 is provided with a liquid inlet pipe 279 for connecting to the pretreatment pool 26, and the right side of the aerobic pool 27 is provided with a liquid outlet pipe 280 for connecting to the sulfur autotrophic denitrification reactor 28) contains an oxygenation component, and oxygenation is achieved in the aerobic pool 27 through the oxygenation component, so that the aerobic pool 27 is an aerobic environment.

[0042] Combination Figure 2 As shown, in this embodiment, the oxygenation component includes a horizontal axis 271 and an oxygenation blade 273 located on the horizontal axis 271. The horizontal axis 271 can be fixed (for example, welded) in the aerobic tank 27. The left end of the horizontal axis 271 extends from the left end of the aerobic tank 27 and is welded and fixed to the left side wall of the aerobic tank 27. The right end of the horizontal axis 271 is stuck on the right inner wall of the aerobic tank 27.

[0043] In this embodiment, nine groups of oxygenating blades 273 are fixed on the horizontal axis 271, and the nine groups of oxygenating blades 273 are arranged and distributed along the length direction of the horizontal axis 271. The number of oxygenating blades 273 in each group is three, and the three oxygenating blades 273 are evenly distributed around the horizontal axis 271. Of course, in other embodiments, the number of groups of oxygenating blades 273 and the number of each group can also be changed according to actual conditions.

[0044] The lengths of the nine groups of oxygenating blades 273 in this embodiment gradually decrease from left to right, and a plurality of air outlet holes 278 are provided on the oxygenating blades 273. Since the lengths of the oxygenating blades 273 decrease from left to right, the number of air outlet holes 278 on the oxygenating blades 273 from left to right also shows a decreasing trend. An air inlet is provided on the left end of the horizontal axis 271, and an air inlet pipe 276 is connected to the air inlet. Gas chambers are provided inside the horizontal axis 271 and inside the oxygenating blades 273, and the gas chamber inside the horizontal axis 271 is connected to the gas chamber inside the oxygenating blades 273.

[0045] In the aerobic pool 27 of the present embodiment, a plurality of partitions 272 for separating the oxygenating blades 273 adjacent in the horizontal direction are fixedly connected. In the present embodiment, the number of the partitions 272 is eight, and the front and rear ends of the eight partitions 272 are fixedly connected to the front and rear inner walls of the aerobic pool 27. For example, a vertical card slot is provided on the front and rear inner walls of the aerobic pool 27, and the partitions 272 are vertically stuck in the card slot. In the present embodiment, the bottom of the partition 272 does not abut against (does not contact) the bottom of the aerobic pool 27, and the top of the partition 272 does not extend to the top of the aerobic pool 27 (the top of the aerobic pool 27 can be open or closed), so that the top and bottom of the aerobic pool 27 are both in a horizontally connected state. The height of the partition 272 in the present embodiment gradually decreases from left to right, and the vertical height of the partition 272 is adapted to the length of the oxygenating blade 273.

[0046] Thus, oxygen is introduced into the horizontal axis 271 through the air inlet pipe 276, and the oxygen enters the gas chamber inside the horizontal axis 271 and the gas chamber inside the oxygenating blade 273. The oxygen flows out from the air outlets 278 of different oxygenating blades 273, thereby achieving oxygenation of different parts of the aerobic pool 27, so that there is a certain amount of oxygen in the aerobic pool 27.

[0047] At the same time, the lengths of the multiple oxygenating blades 273 in this embodiment gradually decrease from left to right, and the number of the air outlet holes 278 on the oxygenating blades 273 gradually decreases from left to right, so that the oxygen content emerging from the oxygenating blades 273 gradually decreases from left to right, so that the distribution of the oxygen emerging in the aerobic tank 27 gradually decreases from left to right, thereby achieving that the part of the aerobic tank 27 far away from the sulfur autotrophic denitrification reactor 28 has more oxygen, while the part of the aerobic tank 27 close to the sulfur autotrophic denitrification reactor 28 has less oxygen, which avoids the effluent from the aerobic tank 27 from bringing in more oxygen after entering the sulfur autotrophic denitrification reactor 28 and destroying the anoxic environment of the sulfur autotrophic denitrification reactor 28, thereby facilitating the smooth progress of sulfur autotrophic denitrification.

[0048] In addition, the partition 272 in this embodiment separates the oxygenating blades 273 adjacent to each other in the transverse direction, and the partition 272 has a certain hindering effect on the transverse diffusion of the oxygen emitted from the oxygenating blades 273, thereby preventing the rapid transverse diffusion of the oxygen emitted from the oxygenating blades 273, and ensuring that the oxygen emitted from the oxygenating blades 273 can be preferentially dispersed vertically in the space between two adjacent partitions 272, thereby facilitating the formation of a distribution ladder in which the oxygen concentration gradually decreases from left to right in the aerobic pool 27. The top and bottom of the aerobic pool 27 in this embodiment are both transversely connected, so that the setting of the partition 272 will not completely affect the transverse flow of the liquid.

[0049] In addition, the partitions 272 may be provided with transverse liquid holes 274. The provision of the liquid holes 274 allows the liquid between adjacent partitions 272 to flow transversely, so as to avoid the partitions 272 completely blocking the transverse diffusion of oxygen and liquid, so that oxygen can also diffuse in the transverse direction, which is convenient for the transverse distribution of oxygen. However, in any case, due to the barrier effect of the partitions 272 on the transverse diffusion of liquid and oxygen, the diffusion speed of oxygen in the vertical direction is greater than the diffusion speed of oxygen in the transverse direction. In this way, the oxygen concentration in the transverse direction of the aerobic pool 27 mainly depends on the amount of oxygen emitted by the oxygenating blades 273 at the corresponding parts, and the oxygen concentration in the aerobic pool 27 still shows a decreasing trend from left to right.

[0050] Example 3 This embodiment is further improved on the basis of the embodiment 2. In this embodiment, the horizontal shaft 271 is rotatably connected to the aerobic pool 27. Specifically, the left end of the horizontal shaft 271 extends from the left inner wall of the aerobic pool 27 but is not welded to the left inner wall of the aerobic pool 27. A seal is provided on the left inner wall of the aerobic pool 27. The seal is made of, for example, rubber to prevent liquid leakage from the part of the aerobic pool 27 where the horizontal shaft 271 passes through. The right end of the horizontal shaft 271 and the right inner wall of the aerobic pool 27, as well as the horizontal shaft 271 and the partition 272 can be rotatably connected via bearings.

[0051] The aerobic pool 27 in this embodiment is provided with a driving mechanism for driving the horizontal shaft 271 to rotate on the outside; the driving mechanism is used to drive the horizontal shaft 271 to rotate. As a driving component, it has various forms. This embodiment introduces one, for example: the driving mechanism includes a driving motor (not shown in the figure), a driving gear (not shown in the figure) and a driven gear 275. The driving motor and the driving gear are coaxially fixed by a pin, and the driven gear 275 and the horizontal shaft 271 are coaxially fixed by a pin, and the driving gear and the driven gear 275 are meshed. Of course, in other embodiments, other driving methods can also be used. The air intake pipe 276 in this embodiment is rotatably matched with the air intake port at the left end of the horizontal shaft 271. Specifically, the air intake pipe 276 is inserted into the air intake port, and the air intake pipe 276 and the horizontal shaft 271 can rotate relative to each other.

[0052] When the horizontal shaft 271 in this embodiment rotates, the oxygenating blade 273 rotates to push the liquid to the right. This purpose can be easily achieved, for example, by designing the oxygenating blade 273 to be spiral (similar to the propeller of a ship), or when the surface of the oxygenating blade 273 is a plane, the oxygenating blade 273 is tilted on the horizontal shaft 271, that is, as shown in FIG. Figure 2 As shown, the so-called inclined setting means that the surface of the oxygenating blade 273 is perpendicular to the bottom of the aerobic pool 27, while the surface of the oxygenating blade 273 is not parallel to the left and right side walls of the aerobic pool 27.

[0053] Therefore, when the sewage treatment system is working, the driving motor drives the driving gear to rotate, the driving gear drives the driven gear 275 to rotate, the driven gear 275 drives the horizontal shaft 271 to rotate, and the horizontal shaft 271 drives multiple groups of oxygenation blades 273 to rotate. During the rotation of the oxygenation blades 273, the liquid is stirred vertically, which is beneficial to the vertical dispersion of oxygen in the space between adjacent partitions 272. At the same time, the oxygenating blades 273 rotate, and the oxygenating blades 273 give the liquid a rightward thrust, thereby driving part of the oxygen to diffuse in the direction of the sulfur autotrophic denitrification reactor 28, thereby realizing the supplement of oxygen in the aerobic tank 27 close to the sulfur autotrophic denitrification reactor 28. The oxygen supplemented to the right can move to the part of the right side where the liquid is not stirred and oxygenated by the shortened oxygenating blades 273, thereby avoiding the situation where the oxygenating blades 273 in the aerobic tank 27 close to the sulfur autotrophic denitrification reactor 28 gradually become shorter, resulting in less oxygen distribution in the part of the aerobic tank 27 close to the sulfur autotrophic denitrification reactor 28 (this part is the part where the liquid cannot be stirred and oxygenated by the shortened oxygenating blades 273).

[0054] It should be noted that, although the rotation of the oxygenating blades 273 pushes the liquid and oxygen in the aerobic pool 27 to the right, the oxygen concentration in the lateral direction of the aerobic pool 27 mainly depends on the amount of oxygen emitted from the oxygenating blades 273 at the corresponding parts. The amount of oxygen moving laterally to the right in the aerobic pool 27 has a relatively small impact on the oxygen concentration in the corresponding parts of the aerobic pool 27 compared to the oxygen emitted from the oxygenating blades 273. Therefore, the overall oxygen concentration in the aerobic pool 27 still shows a decreasing trend from left to right.

[0055] Example 4 Basically as attached Figure 3-Figure 6As shown: This embodiment improves the sulfur autotrophic denitrification reactor 28. The sulfur autotrophic denitrification reactor 28 in this embodiment is specifically a fluidized bed reactor for sewage treatment, including a vertical tank body 1. The tank body 1 is circular in shape when viewed from above. A base 2 is installed at the bottom of the tank body 1. The arrangement of the base 2 improves the stability of the placement of the tank body 1. A water inlet 4 is installed at the bottom of the tank body 1. The water inlet 4 is a cyclone water inlet. The water outlet of the water inlet 4 (the water outlet is a nozzle) is inclined upward at 15-20 degrees with the horizontal plane. The water inlet pipe 3 is connected to the water inlet 4. The water inlet pipe 3 is located on the left side of the tank body 1 and is used to communicate with the aerobic tank 27. In this embodiment, the water outlet of the cyclone water inlet is tilted at 15-20 degrees. The reason for this setting is that the water outlet at this angle can provide upward impact force and tangential force, ensure sufficient fluidization of the filler in the fluidized zone, enhance the contact and mixing of sewage and sulfur powder, improve the cultivation efficiency of granular sludge, and make the sulfur autotrophic denitrification reaction more complete.

[0056] The tank body 1 is connected with a return pipe 9, which is located on the right side of the tank body 1. The lower end of the return pipe 9 is connected to the water inlet 4, and the upper end of the return pipe 9 is connected to a water absorbing member 18. The water absorbing member 18 is located inside the tank body 1 and divides the inside of the tank body 1 into a clean water area 7 located above the water absorbing member 18 and a fluidized area 6 located below the water absorbing member 18. The fluidized area 6 is filled with a filler 5, which is sulfur powder. The water absorbing member 18 in this embodiment is specifically a water absorbing pipe, combined with Figure 5 As shown, a transversely arranged water suction port 21 is provided on the side wall of the water suction pipe. The number of the water suction pipes can be multiple, and the multiple water suction pipes are connected to each other in a certain shape. The specific shape formed by the multiple water suction pipes is not important, and the multiple water suction pipes can be connected in various shapes, such as multiple water suction pipes are arranged in parallel and connected (connected head to tail in sequence, or connected head to head and tail to tail); or the ends of multiple water suction pipes are connected to form a central radial shape, in which case the connection and communication parts of the multiple water suction pipes are located in the center of the radial shape.

[0057] A circulation pump 10 is installed on the top of the return pipe 9. The number of circulation pumps 10 can be set according to actual conditions. This embodiment shows one. The fluidized area 6 is provided with a plurality of vertically arranged water outlets. The number of water outlets in this embodiment is four. The water outlet is provided with a plurality of liquid outlet holes, and the water outlets are all connected to the return pipe 9. The liquid sucked by the water absorbing member 18 enters the water inlet 4 and each water outlet through the return pipe 9. Specifically, in combination with Figure 6As shown, the water outlet member in this embodiment includes a plurality of water outlet branch pipes 8, and the plurality of water outlet branch pipes 8 are connected. The connection mode of the plurality of water outlet branch pipes 8 can be parallel (the water outlet branch pipes 8 are arranged in parallel and the ends are connected) or series (the water outlet branch pipes 8 are arranged in parallel and the ends are connected in sequence). The connection mode of the plurality of water outlet branch pipes 8 can also be other modes. The shape of the water outlet member formed by the plurality of water outlet branch pipes 8 is not important, and any shape is acceptable. In this embodiment, the shape of the water outlet member formed by the plurality of water outlet branch pipes 8 is as follows: Figure 6 As shown, the lateral part of the water outlet can extend as far as possible to the left to different lateral parts of the liquid, and different water outlet branches 8 are located at different lateral parts in the front and rear directions of the tank body. In this embodiment, the top view of the tank body 1 is circular, and the lengths of each water outlet branch 8 are different. The closer to the diameter of the tank body 1, the longer the water outlet branch 8. In order to improve the stability of the water outlet branch 8, the left end of the water outlet branch 8 is connected to the inner wall of the tank body 1 in this embodiment, and the connection method can be welding or clamping. When clamping, the inner wall of the left side of the tank body 1 is provided with a clamping groove, and the left end of the water outlet branch 8 is clamped in the clamping groove. The water outlet branch 8 is provided with a liquid outlet hole, and the liquid outlet hole is located on the upper surface of the water outlet branch 8. A branch assembly is connected between each water outlet and the return pipe 9. The branch assembly in this embodiment includes a branch pipe 17 and a connecting pipe 11, the connecting pipe 11 is connected to the water outlet, and the branch pipe 17 is connected to the connecting pipe 11; the branch pipe 17 is connected to the return pipe 9 and a first valve 16 is provided at the connection position. Since the number of water outlet parts in this embodiment is four, the number of branch circuit components in this embodiment is four, and the four branch circuit components are also arranged from top to bottom.

[0058] Therefore, containing NO3 - -N sewage enters the water inlet 4 through the water inlet pipe 3, the sewage flows out from the water inlet 4 obliquely upward and continuously flows upward, the sewage and SO undergo sulfur autotrophic denitrification in the fluidized zone 6, and the purified water overflows to the clean water zone 7. The water in the clean water zone 7 is more stable and cleaner than the liquid in the sulfidation zone 6.

[0059] At the same time, the circulation pump 10 is started, and the water at the top of the fluidized area 6 enters the water absorbing member 18 laterally through the horizontal water suction port 21, and flows rightward into the return pipe 9 through the water absorbing member 18. A part of the liquid in the return pipe 9 enters the four branch components, and a part flows downward to the bottom of the return pipe 9, and flows back into the water inlet 4, and is sprayed out from the water inlet 4. In this way, a part of the water sprayed out of the water inlet 4 comes from the water inlet pipe 3, and a part comes from the return pipe 9. Compared with only the water in the water inlet pipe 3 being sprayed out from the water inlet 4, the amount of water sprayed out of the water inlet 4 is greater, and the water sprayed out of the water inlet 4 is more sufficient, and the upward impact force of the water in the fluidized area 6 is greater, which is conducive to the upward flow of water in the fluidized area 6, so that the water and the filler 5 are fully mixed, thereby helping to improve the fluidization effect of the fluidized area 6.

[0060] The water at the top of the fluidized zone 6 is sucked by the water absorbing member 18, and the water absorbing member 18 has an upward suction force on the water in the fluidized zone 6 as a whole. In this way, the water absorbing member 18 at the top of the fluidized zone 6 sucks the water upward, and the water inlet 4 at the bottom of the fluidized zone 6 sprays the water upward at an angle, which is conducive to the upward flow of water in the fluidized zone 6, reduces the sinking of SO, improves the fluidization effect, makes SO and sewage better mixed, and the sulfur autotrophic denitrification reaction is more sufficient.

[0061] In addition, the liquid in the reflux pipe 9 flows to the left into each branch component, and the liquid in each branch component flows into the corresponding water outlet parts, and the liquid flows out from the water outlet parts at different heights. The liquid flowing out from the water outlet parts can impact the liquid at different heights of the fluidizing zone 6, so that the positions at different heights in the middle of the fluidizing zone 6 can also be impacted and no longer calm, which is beneficial to the mixed contact of water and filler 5. Compared with the prior art where only the top and bottom of the fluidizing zone 6 are subjected to greater force, while the middle part of the fluidizing zone 6 is subjected to weaker force, the problem of poor fluidization effect in the middle part of the fluidizing zone 6 is solved, and the fluidization effect in the middle part of the fluidizing zone 6 is improved.

[0062] Example 5 This embodiment is further improved on the basis of embodiment 4. Figure 3 , Figure 4 As shown, in this embodiment, the connection tube 11 is connected to a sampling tube 13, and a second valve 20 is provided on the sampling tube 13. One end of the sampling tube 13 away from the connection tube 11 is connected to a sampling box 14.

[0063] Therefore, during the normal fluidization process, the second valve 20 is in a closed state, the first valve 16 is in an open state, liquid flows out of the water outlet, and liquid does not flow out of the sampling tube 13 .

[0064] When it is necessary to sample the liquid at different heights of the tank body 1 to detect the fluidization effect of the liquid at different heights in the tank body 1, the first valve 16 at the corresponding height is closed, and the liquid in the reflux pipe 9 stops entering the branch pipe 17. Then the second valve 20 is opened, and the liquid around the water outlet at the corresponding height enters the water outlet through the liquid outlet hole of the water outlet, flows to the right into the connecting pipe 11, and finally flows out from the sampling pipe 13, thereby realizing the sampling of the liquid at the corresponding height.

[0065] The water outlet component in this embodiment is provided with different numbers of water outlet branch pipes 8 arranged in front and back, and different water outlet branch pipes 8 are located at different transverse positions of the tank body 1. In this way, during the sampling process, liquid at different transverse positions in the tank body 1 at corresponding heights enters the water outlet component, and the liquid flowing out of the sampling tube 13 is the liquid at different transverse positions of the tank body 1, so that the sampled liquid comes from different positions in the tank body 1, and the sampling of liquid at different transverse positions of the water outlet component is realized. The sampled liquid will not be concentrated in a certain position in the tank body 1, which is conducive to improving the accuracy of sampling detection.

[0066] Example 6 Before sampling, since the liquid in the water outlet comes directly from the liquid in the return pipe 9 during the water outlet process, and the liquid in the return pipe 9 comes directly from the water absorbing part 18 (the water in the water absorbing part 18 comes from the top of the fluidizing area 6), if sampling is performed directly, the collected liquid is not the liquid on the outside of the water outlet, but the liquid that has just entered the water outlet from the return pipe 9, which will cause a large error in sampling detection.

[0067] Therefore, in order to solve the above problems, this embodiment is further improved on the basis of embodiment 5. In this embodiment, the sampling tubes 13 are all connected with drainage branches 12, and the ends of the plurality of drainage branches 12 away from the sampling tubes 13 are connected with a drainage main pipe 15, and the drainage main pipe 15 is connected to the bottom of the reflux pipe 9. The drainage branches 12 are all provided with a third valve 19.

[0068] Therefore, before sampling, the first valve 16 and the second valve 20 are closed, and the third valve 19 is opened. The liquid in the connecting pipe 11 and the water outlet part enters the drainage branch pipe 12 along the connecting pipe 11 and the sampling pipe 13. The liquid enters the drainage main pipe 15 from the drainage branch pipe 12, and flows back to the bottom of the reflux pipe 9 along the drainage main pipe 15, and finally enters the water inlet 4. In this way, the liquid entering from the reflux pipe 9 in the connecting pipe 11 and the water outlet part before sampling is discharged, so as to avoid that the liquid collected during sampling is the liquid entering from the reflux pipe 9 into the connecting pipe 11 and the water outlet part, rather than the liquid around the outer side of the water outlet part.

[0069] When the remaining liquid in the connecting pipe 11 and the water outlet is discharged, the liquid outside the water outlet in the tank body 1 enters the water outlet. At this time, the third valve 19 is closed and the second valve 20 is opened. The liquid flowing out of the sampling tube 13 is the liquid around the outside of the water outlet in the fluidizing area 6, thereby ensuring the accuracy of the sampled liquid and facilitating improving the accuracy of sampling detection.

[0070] In this embodiment, the second valve 20 and the third valve 19 are provided separately. Of course, in other embodiments, the second valve 20 and the third valve 19 can be the same valve, and are located at the connection part of the sampling tube 13 and the drainage branch pipe 12. Specifically, a three-way valve is provided at the connection part of the sampling tube 13 and the drainage branch pipe 12. By controlling the three-way valve, the flow direction of the liquid can be controlled, thereby controlling whether the liquid in the connecting tube 11 enters the drainage branch pipe 12 or flows directly out of the sampling tube 13.

[0071] Example 7 This embodiment is improved on the basis of the above embodiments 4-6. Figure 7 As shown, the water outlet part in this embodiment includes a water outlet main pipe 22 and a plurality of water outlet branch pipes 8, and the water outlet branch pipes 8 are connected to the water outlet main pipe 22. The water outlet branch pipe 8 is inserted into the tank body 1 from the right side of the tank body 1, and the right end of the water outlet branch pipe 8 extends from the right side of the tank body 1. The water outlet branch pipe 8 is rotatably arranged on the tank body 1, and the specific rotation method is: a pipe hole is arranged on the right side of the tank body 1, and the water outlet branch pipe 8 and the pipe hole of the tank body 1 are rotatably connected through a bearing. In order to improve the setting stability of the water outlet branch pipe 8, the left end of the water outlet branch pipe 8 in this embodiment is rotatably connected to the inner wall of the tank body 1, and the specific rotation connection method is: a bearing is fixedly arranged on the inner wall of the tank body 1, and the left end of the water outlet branch pipe 8 is connected to the left inner wall of the tank body 1 through a bearing, or a support part for supporting the left end of the water outlet branch pipe 8 is arranged on the left side of the inner wall of the tank body 1, and the support part is, for example, a support groove or a support block fixed on the inner wall of the tank body 1, and the left end of the water outlet branch pipe 8 is movably placed on the support part. A sealing ring is fixed or bonded on the right side wall of the tank body 1 by screws, and the water outlet branch pipe 8 passes through the sealing ring, so that the gap between the water outlet branch pipe 8 and the tank body 1 is blocked by the sealing ring, reducing or avoiding water leakage at the pipe hole of the tank body 1. The water outlet main pipe 22 in this embodiment is provided with a connector connected to a plurality of water outlet branch pipes 8, and the connector is inserted into the right end of the water outlet branch pipe 8 (the diameter of the connector is smaller than the diameter of the right end of the water outlet branch pipe 8), and the connector and the water outlet branch pipe 8 are rotatably matched. In order to reduce liquid leakage at the connector, a sealing ring can also be fixedly provided at the connector to seal the connection between the connector and the right end of the water outlet branch pipe 8. A driven sprocket 23 is coaxially connected (for example, welded or keyed) to each outlet branch pipe 8, a driving sprocket 25 is provided on the outside of the outlet branch pipe 8, a chain 24 is connected between the driven sprockets 23 and the driving sprocket 25, a motor (not shown in the figure) for driving the driving sprocket 25 to rotate is provided on the outside of the tank body 1, and in some embodiments, a reducer can be provided between the driving sprocket 25 and the motor, so that the speed at which the motor drives the driving sprocket 25 is slow. The connecting pipe 11 is connected to the outlet main pipe 22.

[0072] Therefore, during the water outlet process, the water outlet part drives the active sprocket 25 to rotate through the motor, the active sprocket 25 drives multiple driven sprockets 23 to rotate through the chain 24, the driven sprocket 23 drives the corresponding water outlet branch pipe 8 to rotate, and the water outlet branch pipe 8 rotates horizontally on the tank body 1, so that the liquid on the water outlet branch pipe 8 is sprayed out in different directions, avoiding the problem of continuous upward spraying in a single direction and forming a dead angle of spraying, which is beneficial to improving the fluidization effect.

[0073] At the same time, during sampling, the liquid outlet hole on the water outlet branch pipe 8 keeps changing position as the water outlet branch pipe 8 rotates, so that not only the liquid above the water outlet branch pipe 8 can enter the water outlet branch pipe 8, but also the liquid on the lateral sides and below of the water outlet branch pipe 8 can enter the water outlet branch pipe 8, thereby realizing sampling on the upper and lower sides and left and right sides of the water outlet branch pipe 8, making the sampling more uniform and the sampling detection more accurate.

[0074] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A wastewater treatment system based on sulfur autotrophic denitrification that can utilize sulfur as a resource, comprising a pretreatment tank, a sulfur autotrophic denitrification reactor and a secondary sedimentation tank, characterized in that: It also includes an aerobic tank and an anaerobic tank, wherein the aerobic tank is connected between the pretreatment tank and the sulfur autotrophic denitrification reactor, the anaerobic tank is connected between the sulfur autotrophic denitrification reactor and the secondary sedimentation tank, and the part of the secondary sedimentation tank containing the supernatant mixed liquid is connected to the aerobic tank; The anaerobic pool contains sulfate-reducing bacteria, which use the sulfate-reducing bacteria to reduce SO4 in the wastewater discharged from the sulfur autotrophic denitrification reactor. 2- Restore to S 2- ; The anaerobic tank contains S 2- The water enters the secondary sedimentation tank, and the supernatant mixed liquid in the secondary sedimentation tank flows back into the aerobic tank; The aerobic pool contains sulfur oxidizing bacteria, and the aerobic pool uses the sulfur oxidizing bacteria to convert sulfur oxidizing bacteria into sulfur in the liquid returned from the secondary sedimentation tank. 2- Oxidized to S0 or S2O3 2- , S0 or S2O3 2- The liquid continues to enter the sulfur autotrophic denitrification reactor.

2. The wastewater treatment system for sulfur resource utilization based on sulfur autotrophic denitrification according to claim 1, characterized in that: The aerobic pool contains an oxygenating component, which includes a horizontal axis and a plurality of oxygenating blades on the horizontal axis. The plurality of oxygenating blades are arranged and distributed along the length direction of the horizontal axis. The length of the plurality of oxygenating blades gradually decreases from the pretreatment tank to the sulfur autotrophic denitrification reactor. The oxygenating blades are provided with a plurality of air outlets, the horizontal axis is provided with an air inlet, the air inlet is connected to an air inlet pipe, gas chambers are provided inside the horizontal axis and inside the oxygenating blades, and the gas chamber inside the horizontal axis is connected to the gas chamber inside the oxygenating blades.

3. The wastewater treatment system capable of utilizing sulfur as a resource based on sulfur autotrophic denitrification according to claim 2, characterized in that: The horizontal axis is rotatably connected to the aerobic pool, and a driving mechanism for driving the horizontal axis to rotate is arranged outside the aerobic pool; the oxygenating blades rotate to push the liquid toward the sulfur autotrophic denitrification reactor.

4. The wastewater treatment system capable of utilizing sulfur as a resource based on sulfur autotrophic denitrification according to claim 3, characterized in that: A plurality of partitions for separating laterally adjacent oxygenating blades are fixedly connected in the aerobic pool, and the top and bottom of the aerobic pool are both laterally connected.

5. The wastewater treatment system capable of utilizing sulfur as a resource based on sulfur autotrophic denitrification according to claim 4, characterized in that: The height of the partition gradually decreases from the pretreatment tank to the sulfur autotrophic denitrification reactor.

6. The wastewater treatment system capable of utilizing sulfur as a resource based on sulfur autotrophic denitrification according to claim 4, characterized in that: The partitions are all provided with transverse liquid holes.

7. The wastewater treatment system capable of utilizing sulfur as a resource based on sulfur autotrophic denitrification according to claim 4, characterized in that: The front and rear ends of the partition are fixedly connected to the front and rear inner walls of the aerobic tank.

8. The wastewater treatment system capable of utilizing sulfur as a resource based on sulfur autotrophic denitrification according to claim 3, characterized in that: The oxygenating blades are spiral or obliquely arranged on the horizontal axis.

9. The wastewater treatment system capable of utilizing sulfur as a resource based on sulfur autotrophic denitrification according to claim 3, characterized in that: The driving mechanism comprises a driving motor, a driving gear and a driven gear. The driving motor and the driving gear are coaxially fixed, the driven gear and the transverse axis are coaxially fixed, and the driving gear and the driven gear are meshed.

10. The wastewater treatment system capable of utilizing sulfur as a resource based on sulfur autotrophic denitrification according to claim 1, characterized in that: The sulfur autotrophic denitrification reactor comprises a vertical tank body, a water inlet is provided at the bottom of the tank body, a water inlet pipe is connected to the water inlet, a return pipe is connected to the tank body, the lower end of the return pipe is connected to the water inlet, and the high end of the return pipe is connected to a water absorbing member, the water absorbing member is located inside the tank body and divides the inner part of the tank body into a clear water area located above the water absorbing member and a fluidizing area located below the water absorbing member, a circulating pump is provided on the fluidizing area, a plurality of vertically arranged water outlet members are provided in the water outlet members, a plurality of liquid outlet holes are provided on the water outlet members, and the water outlet members are all connected to the return pipe; the liquid sucked by the water absorbing member enters the water inlet and each water outlet member through the return pipe.

Images