Sulfur autotrophic denitrification-based sewage treatment system capable of sulfur resource utilization

Abstract

The present application relates to the field of sewage treatment, and particularly relates to a sewage treatment system capable of sulfur resource utilization 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 connected in sequence, and the part containing supernatant mixed liquid of the secondary sedimentation tank is communicated with the aerobic tank; the anaerobic tank contains sulfate-reducing bacteria, and the sulfate (SO4 2‑ ) in the sewage discharged from the sulfur autotrophic denitrification reactor is reduced to S 2‑ by the sulfate-reducing bacteria in the anaerobic tank; the water containing S 2‑ in the anaerobic tank enters the secondary sedimentation tank, and the supernatant mixed liquid in the secondary sedimentation tank returns to the aerobic tank; the aerobic tank contains sulfur-oxidizing bacteria, and S 2‑ in the liquid returned from the secondary sedimentation tank is oxidized to SO and S2O3 2‑ by the sulfur-oxidizing bacteria in the aerobic tank. Through the present application, the problem that more SO4 2‑ is produced in the current sulfur autotrophic denitrification process is solved, and the consumption of the electron donor is reduced, thereby reducing the cost.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and more specifically to a wastewater treatment system based on sulfur autotrophic denitrification that enables the utilization of sulfur resources. Background Technology

[0002] Sulfate-autotrophic microorganisms thrive in anaerobic or hypoxic environments by utilizing inorganic carbon (CO3). 2- HCO3 - Using nitrite (NO2) as a carbon source, and by adding an electron donor, nitrite (NO2) is... - -N) or nitrates (NO3) - The process of reducing nitrate (N-) 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 and groundwater, and drinking water.

[0003] In the process of sulfur autotrophic denitrification, a considerable amount of sulfate (SO4) will be produced regardless of the electron donor used. 2- Especially when treating wastewater with high concentrations of ammonia nitrogen (1185-1334 mg / L), its SO4 2- The production rate can reach 4682 mg / L. However, if the concentration of SO4 is high... 2- Direct discharge into the receiving water body will inevitably cause serious pollution to the aquatic ecosystem. This is especially true for high concentrations of SO4. 2- While centralized treatment before discharge may reduce pollution to the aquatic ecosystem, it will significantly increase SO4 levels. 2- The processing cost. Summary of the Invention

[0004] This invention aims to provide a wastewater treatment system based on sulfur autotrophic denitrification that can utilize sulfur resources, in order to solve the problem that current sulfur autotrophic denitrification processes generate a large amount of SO4. 2- The problem of SO4 2- This reduces pollution while also decreasing the consumption of electron donors and lowering costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a wastewater treatment system based on sulfur autotrophic denitrification that can utilize sulfur resources, including a pretreatment tank, a sulfur autotrophic denitrification reactor and a secondary sedimentation tank, and also including an aerobic tank and an anaerobic tank. The aerobic tank is connected between the pretreatment tank and the sulfur autotrophic denitrification reactor, and the anaerobic tank is connected between the sulfur autotrophic denitrification reactor and the secondary sedimentation tank. The part of the secondary sedimentation tank containing the supernatant mixture is connected to the aerobic tank.

[0006] The anaerobic tank contains sulfate-reducing bacteria, which utilize the action of these bacteria to remove SO4 from the wastewater discharged from the sulfur autotrophic denitrification reactor. 2- Restore to S 2- ;

[0007] Anaerobic tank contains S 2- The water enters the secondary sedimentation tank, and the supernatant mixture in the secondary sedimentation tank is returned to the aerobic tank.

[0008] The aerobic tank contains sulfur-oxidizing bacteria. These bacteria utilize the sulfur-oxidizing properties of the bacteria to remove sulfur from the liquid returning from the secondary sedimentation tank. 2- Oxidized to S0 or S2O3 2- S0 or S2O3 2- The liquid continues to flow into the sulfur autotrophic denitrification reactor.

[0009] The principle and advantages of this scheme are as follows: In this scheme, the wastewater first enters the pretreatment tank for pretreatment, where large particulate matter in the wastewater settles. Then, the wastewater enters the aerobic tank, where nitrification occurs, producing NH4+. + -N is converted to NO3 - -N, while removing most of the organic matter from the wastewater, avoids heterotrophic denitrification reactions in the sulfur autotrophic denitrification reactor. Then, the water in the aerobic tank flows to the sulfur autotrophic denitrification reactor, which is filled with packing material. The denitrifying thiobacteria in the sulfur autotrophic denitrification reactor produce NO3-. - -N acts as the electron acceptor, and S0 in the packing material acts as the electron donor, resulting in autotrophic denitrification, which converts NO3- into nitrogen. - -N is converted to N2, and SO4 is produced at the same time. 2- Then, after sulfur autotrophic denitrification treatment, it contains SO4. 2- Water enters the anaerobic tank, where sulfate-reducing bacteria break down the SO4 in the liquid. 2- Restore to S 2- Then containing S 2- The liquid enters the secondary sedimentation tank from the anaerobic tank. The liquid in the secondary sedimentation tank, containing the supernatant mixture, is then returned to the aerobic tank, where sulfur-oxidizing bacteria utilize the sulfur-oxidizing bacteria to process the sulfur. 2- Oxidized to SO, S2O3 2- It then continues to enter the sulfur autotrophic denitrification reactor to process the SO and S2O3 generated in the aerobic tank. 2- It can be used as an electron donor for denitrification, thereby realizing the recycling of part of the sulfur element in the entire wastewater treatment system.

[0010] Therefore, the inventive concept of this application is: to remove SO4 from the wastewater discharged from the sulfur autotrophic denitrification reactor through an anaerobic tank. 2- Restore to S 2- This achieved the removal of SO4 from the wastewater discharged from the sulfur autotrophic denitrification reactor. 2- The consumption of S, and then the S-containing solution is removed through a secondary sedimentation tank. 2- The liquid is returned to the aerobic tank, thereby removing the sulfur from the liquid.2- Oxidized to SO and S2O3 2- S0, S2O3 2- The SO42-containing gas continues to enter the sulfur autotrophic denitrification reactor along with the liquid, participating in the reaction and thus replenishing the reactor with electron donors, which helps reduce electron donor consumption. Therefore, the scheme described in this application not only achieves the production of SO42-... 2- The use of SO4 reduces SO4 2- The emissions of SO4 have been reduced. 2- Pollution is reduced, while the consumption of electron donors is decreased, thus lowering the cost of wastewater treatment (e.g., the cost of electron donors).

[0011] Preferably, as an improvement, the aerobic tank contains an oxygenation component, which includes a horizontal axis and multiple oxygenation blades located on the horizontal axis. The multiple oxygenation blades are arranged along the length of the horizontal axis, and the length of the multiple oxygenation blades gradually decreases from the pretreatment tank to the sulfur autotrophic denitrification reactor. The oxygenation blades are provided with multiple air outlets, and the horizontal axis is provided with an air inlet connected to an air inlet pipe. Gas chambers are provided inside the horizontal axis and inside the oxygenation blades, and the gas chambers inside the horizontal axis and the gas chambers inside the oxygenation blades are connected.

[0012] Thus, oxygen is introduced into the horizontal shaft through the air inlet pipe. The oxygen enters the gas chamber inside the horizontal shaft and the gas chamber inside the oxygenating blades. The oxygen flows out from the air outlets of different oxygenating blades, thereby achieving oxygenation to different parts of the aerobic tank, so that the aerobic tank has a certain amount of oxygen.

[0013] The reason for designing the length of multiple oxygenating blades in this application to gradually decrease from the pretreatment tank towards the sulfur autotrophic denitrification reactor is that this arrangement ensures that the further away from the sulfur autotrophic denitrification reactor, the longer the oxygenating blades, resulting in more oxygen emanating from the blades and surrounding areas. Conversely, the closer to the sulfur autotrophic denitrification reactor, the shorter the oxygenating blades, resulting in less oxygen emanating from the blades and surrounding areas. This ensures that the oxygen distribution in the aerobic tank gradually decreases from the pretreatment tank towards the sulfur autotrophic denitrification reactor. This prevents excessive oxygen emanating from the aerobic tank near the sulfur autotrophic denitrification reactor from introducing too much oxygen into the reactor, which could disrupt the anoxic environment of the reactor. It also prevents the reaction from turning into heterotrophic denitrification due to excess oxygen in the reactor, thus ensuring the smooth progress of sulfur autotrophic denitrification.

[0014] Preferably, as an improvement, the horizontal shaft is rotatably connected to the aerobic tank, and the outside of the aerobic tank is provided with a drive mechanism for driving the horizontal shaft to rotate; the oxygenating blades rotate to push the liquid toward the sulfur autotrophic denitrification reactor.

[0015] Therefore, the horizontal shaft is driven to rotate by the drive mechanism, and the horizontal shaft drives the oxygenation blades to rotate. In this way, the rotation of the oxygenation blades first achieves the vertical stirring of the liquid, which is conducive to the uniform distribution of oxygen in the vertical direction.

[0016] Secondly, the rotating oxygenating blades push the liquid towards the sulfur autotrophic denitrification reactor, similar to how the rotating oars of a ship propel the liquid away from the oars. The liquid flowing towards the sulfur autotrophic denitrification reactor carries some oxygen towards it, thus replenishing the oxygen in the aerobic tank towards the sulfur autotrophic denitrification reactor. This alleviates the problem of insufficient oxygen in the aerobic tank near the sulfur autotrophic denitrification reactor due to the shorter length of the oxygenating blades.

[0017] In summary, by using the oxygenation component in this application, the length of the oxygenation component decreases sequentially towards the sulfur autotrophic denitrification reactor. This results in an overall decreasing trend in the lateral distribution of oxygen in the aerobic tank, preventing an excess of oxygen near the sulfur autotrophic denitrification reactor. At the same time, the rotation of the oxygenation blades causes some oxygen to diffuse laterally towards the sulfur autotrophic denitrification reactor, avoiding the situation where less oxygen is emitted from the aerobic tank near the sulfur autotrophic denitrification reactor due to the shorter oxygenation blades.

[0018] Preferably, as an improvement, the aerobic tank is fixedly connected with multiple baffles for separating laterally adjacent oxygenating blades, and the top and bottom of the aerobic tank are laterally connected.

[0019] Therefore, the baffle separates the horizontally adjacent oxygenating blades, hindering the lateral diffusion of oxygen emitted from the blades. This restricts the rapid lateral diffusion of oxygen from the blades, ensuring that the oxygen emitted from the blades can preferentially disperse vertically, quickly forming an oxygen distribution gradient. The top and bottom of the aerobic tank are horizontally connected, so the top or bottom of the baffle will not affect the lateral flow of the liquid.

[0020] Preferably, as an improvement, the height of the baffle gradually decreases from the pretreatment tank to the sulfur autotrophic denitrification reactor. This allows the length of the baffle to adapt to the variation in the length of the oxygenation blades. Longer oxygenation blades require longer vertical baffles for separation, while shorter oxygenation blades, due to their smaller vertical stirring range, do not require longer vertical baffles. Therefore, the number of baffles can gradually decrease.

[0021] Preferably, as an improvement, the baffles are provided with transverse liquid passage holes. The liquid passage holes prevent the baffles from completely blocking the transverse flow of liquid, ensuring that a certain amount of liquid and oxygen can flow transversely through the liquid passage holes.

[0022] Preferably, as an improvement, the front and rear ends of the baffle are fixedly connected to the front and rear inner walls of the aerobic tank. Therefore, the bottom or top of the baffle is not fixed to the aerobic tank, thus avoiding obstruction of the lateral flow of the liquid by the bottom or top of the baffle.

[0023] Preferably, as an improvement, the oxygenating blades are spiral-shaped or inclined on the horizontal axis. Thus, the rotation of the oxygenating blades can provide lateral thrust to the liquid.

[0024] Preferably, as an improvement, the drive mechanism includes a drive motor, a driving gear, and a driven gear. The drive motor and the driving gear are coaxially fixed, and the driven gear and the horizontal shaft are coaxially fixed. The driving gear and the driven gear mesh. Thus, the drive motor drives the driving gear to rotate, the driving gear drives the driven gear to rotate, and the driven gear drives the horizontal shaft to rotate.

[0025] Preferably, as an improvement, the sulfur autotrophic denitrification reactor includes a vertical tank. A water inlet is located at the bottom of the tank, connected to a water inlet pipe. A return pipe is connected to the tank. The lower end of the return pipe is connected to the water inlet, and the upper end is connected to a suction element. The suction element is located inside the tank and divides the tank into a clear water zone above the suction element and a fluidization zone below the suction element. A circulation pump is installed on the return pipe. The fluidization zone has multiple vertically arranged outlets, each with multiple liquid outlet holes, all connected to the return pipe. The liquid drawn in by the suction element enters the water inlet and each outlet through the return pipe.

[0026] In the prior art, NO3 is present. - Wastewater containing sulfur dioxide (SO4) passes through an aerobic tank and enters the inlet pipe. The wastewater flows out of the inlet and continuously rises within the tank. In the fluidized zone, the wastewater and SO4 undergo sulfur autotrophic denitrification. The purified water is located in the clear water zone at the top of the tank. A circulation pump draws water from the top of the fluidized zone into a return pipe, from which the liquid flows back into the inlet and is ejected, thus achieving water circulation. The water is ejected upwards at an angle from the inlet, providing upward impact and tangential force. Simultaneously, the return pipe draws water from the top of the fluidized zone, and the water at the top of the fluidized zone flows into the return pipe. This ensures that the packing material is more evenly and dispersed under the impact of water entering from the bottom of the tank and the suction force of water entering from the top of the fluidized zone, reducing packing material settling and enhancing the fluidization effect of the fluidized zone. This allows for thorough mixing and contact between SO4 and wastewater, resulting in a more complete sulfur autotrophic denitrification reaction.

[0027] Because the bottom of the fluidizing zone is subjected to the upward force of the inlet, and the top of the fluidizing zone is subjected to the suction of the return pipe, both the top and bottom of the fluidizing zone are subjected to force. However, the middle part of the fluidizing zone is relatively calm and gentle compared to the top and bottom, which is not conducive to the full mixing reaction of SO and water. The fluidization effect in the middle part of the fluidizing zone is poor.

[0028] Therefore, this application improves the sulfur autotrophic denitrification reactor by using a circulating pump to draw water from the top of the fluidization zone into the return pipe through the suction element, and then into the inlet, from which it is ejected, thus achieving water circulation. The water drawn into the return pipe by the suction element and the water in the inlet pipe are both ejected upwards at an angle from the inlet. Compared to when only the water in the inlet pipe is ejected upwards at an angle, the volume of water ejected upwards from the inlet is greater, resulting in a stronger upward impact force on the liquid in the fluidization zone. This promotes upward flow of water in the fluidization zone, ensuring thorough mixing of water and packing material, thereby improving the fluidization effect of the fluidization zone.

[0029] At the same time, the return pipe draws 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 conducive to the upward flow of water in the fluidized zone, so that SO and sewage can mix and react better, reducing the settling of SO and improving the fluidization effect.

[0030] Furthermore, since all the outlet components are connected to the return pipe, the liquid entering the return pipe from the suction component also enters the outlet components at different heights. The liquid flows out from the outlet components at different heights, and the liquid flowing out from the outlet components can impact the liquid at different heights. This causes the different heights in the middle of the fluidized zone to be impacted and no longer relatively calm, which is beneficial to the mixing and contact of water and packing in the middle of the fluidized zone. Compared with the existing technology, where only the top and bottom of the fluidized zone are subjected to greater forces while the middle of the fluidized zone is subjected to weaker forces, this technology solves the problem of poor fluidization effect in the middle of the fluidized zone and improves the fluidization effect in the middle of the fluidized zone.

[0031] In summary, the above scheme uses an upward-spraying inlet to impact and swirl the liquid at the bottom of the fluidized zone, while the suction unit draws in liquid from the top of the fluidized zone, creating suction. The outlet impacts the liquid at different heights within the fluidized zone. This ensures that different parts of the fluidized zone are subjected to stress, preventing the fluid from becoming calm and gentle. Consequently, the overall fluidization effect of the fluidized bed reaction zone is greatly improved, achieving a more complete and thorough sulfur autotrophic denitrification reaction. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a wastewater treatment system that utilizes sulfur resources based on sulfur autotrophic denitrification.

[0033] Figure 2 This is a cross-sectional view of the aerobic tank.

[0034] Figure 3 This is a schematic diagram of the structure of a fluidized bed reactor for wastewater treatment.

[0035] Figure 4 for Figure 3 A magnified view of A in the middle.

[0036] Figure 5 for Figure 3 Top sectional view of the central suction pipe.

[0037] Figure 6 for Figure 3 Top view of the water outlet component.

[0038] Figure 7 This is a top view of the water outlet component inside the tank in Example 7. Detailed Implementation

[0039] The following detailed description illustrates the specific implementation method:

[0040] The reference numerals in the accompanying drawings include: tank 1, base 2, inlet pipe 3, inlet device 4, packing 5, fluidization zone 6, clear water zone 7, outlet branch pipe 8, return pipe 9, circulation pump 10, connecting pipe 11, drain branch pipe 12, sampling pipe 13, sampling box 14, drain main pipe 15, first valve 16, branch pipe 17, suction component 18, third valve 19, second valve 20, suction port 21, outlet main pipe 22, driven sprocket 23, chain 24, driving sprocket 25, pretreatment tank 26, aerobic tank 27, horizontal shaft 271, baffle 272, oxygenation blade 273, liquid passage 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, and inlet pump 31. Example 1

[0041] The basics are as follows: Figure 1 As shown: This embodiment discloses a wastewater treatment system based on sulfur autotrophic denitrification that allows for the utilization of sulfur resources. It includes a pretreatment tank 26, a sulfur autotrophic denitrification reactor 28, and a secondary sedimentation tank 30, as well as an aerobic tank 27 and an anaerobic tank 29. The pretreatment tank 26, aerobic tank 27, sulfur autotrophic denitrification reactor 28, anaerobic tank 29, and secondary sedimentation tank 30 are connected sequentially from left to right. The bottom of the aerobic tank 27 is connected to the 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 portion of the secondary sedimentation tank 30, containing the supernatant mixture, is connected to the aerobic tank 27. Figure 1(The pipes shown by the dashed lines are connected). In this embodiment, the connection can be made via pipes. An inlet pump 31 is located on the left side of the pretreatment tank 26, which pumps wastewater into the pretreatment tank 26. A pipe connects the bottom of the secondary sedimentation tank 30 and the anaerobic tank 29. A portion of the sludge at the bottom of the secondary sedimentation tank 30 can flow back to the anaerobic tank 29 through the pipe, and a portion of the sludge at the bottom of the secondary sedimentation tank 30 is discharged.

[0042] In this embodiment, the anaerobic tank 29 contains sulfate-reducing bacteria, and the total number of sulfate-reducing bacteria colonies in this embodiment is approximately 2.66 × 10⁻⁶. 9 CFU / ml, and the total number of sulfate-reducing bacteria colonies can be appropriately changed when treating different types of wastewater. Anaerobic tank 29 utilizes the action of sulfate-reducing bacteria to remove SO4 from the wastewater discharged from sulfur autotrophic denitrification reactor 28. 2- Restore to S 2- ;

[0043] Anaerobic tank 29 contains S 2- Water enters the secondary sedimentation tank 30, and the supernatant mixture at the top of the secondary sedimentation tank 30 is returned to the aerobic tank 27. In order to make the liquid return from the top of the secondary sedimentation tank 30 to the aerobic tank 27 more smoothly, a return pump is installed on the return pipe between the top of the secondary sedimentation tank 30 and the aerobic tank 27.

[0044] The aerobic tank 27 contains sulfur-oxidizing bacteria. In this embodiment, the total number of sulfur-oxidizing bacteria colonies is approximately 5.20 × 10⁻⁶. 9 CFU / ml, and the total number of sulfur-oxidizing bacteria can be appropriately changed when treating different types of wastewater. Anaerobic tank 27 utilizes the action of sulfur-oxidizing bacteria to remove S from the liquid returned from secondary sedimentation tank 30. 2- Oxidized to SO and S2O3 2- S0, S2O3 2- The liquid continues to flow to the right into the sulfur autotrophic denitrification reactor 28.

[0045] The specific implementation process is as follows: In this embodiment, the wastewater first enters the pretreatment tank 26 through the influent pump 31 for pretreatment, where large particulate matter in the wastewater settles. Then, the wastewater enters the aerobic tank 27, which is filled with oxygen. Nitrification occurs in the aerobic tank 27, and the NH4+ in the wastewater is converted into nitrogen. + -N is converted to NO3 --N, while removing most of the organic matter from the wastewater, avoids heterotrophic denitrification 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 packing material (e.g., sulfur powder). The wastewater undergoes sulfur autotrophic denitrification in the sulfur autotrophic denitrification reactor 28. The denitrifying thiobacteria in the sulfur autotrophic denitrification reactor 28 produce NO3-. - -N acts as the electron acceptor, and S0 in the packing material acts as the electron donor, resulting in autotrophic denitrification, which converts NO3- into nitrogen. - -N is converted to N2, and some SO4 is produced at the same time. 2- This embodiment uses the treatment of high-concentration ammonia nitrogen (1185-1334 mg / L) wastewater as an example for illustration. In the aerobic tank 27, the ammonia nitrogen is nitrified to produce NO3. - -N concentrations as high as 1063-1244 mg / L, followed by SO4 produced after treatment in a sulfur autotrophic denitrification reactor 28. 2- The average concentration was 4682 mg / L. Then, after sulfur autotrophic denitrification treatment, it contained SO4. 2- Water enters anaerobic tank 29, where sulfate-reducing bacteria reduce SO4 in the liquid. 2- Restore to S 2- Then containing S 2- The liquid enters the secondary sedimentation tank 30 from the anaerobic tank 29. The liquid containing the supernatant mixture in the secondary sedimentation tank 30 is then returned to the aerobic tank 27. The sulfur-oxidizing bacteria in the aerobic tank 27 then process the re-entering sulfur... 2- Oxidized to SO, S2O3 2- It continues to the right into the sulfur autotrophic denitrification reactor 28 to process the SO and S2O3 generated in the aerobic tank 27. 2- It is used as an electron donor for nitrogen removal, thereby realizing the recycling of part of the sulfur element in the entire wastewater treatment system and reducing SO4. 2- Emissions. Example 2

[0046] In Example 1, the aerobic tank 27 is filled with oxygen, while the sulfur autotrophic denitrification reactor 28 does not require oxygen during the reaction, thus creating an oxygen-deficient environment inside the reactor. However, when the aerobic tank 27 is filled with a large amount of oxygen, the liquid flowing from the aerobic tank 27 to the sulfur autotrophic denitrification reactor 28 carries in more oxygen, which disrupts the oxygen-deficient environment of the reactor. This is detrimental to the sulfur autotrophic denitrification reaction occurring in the reactor 28 and instead promotes heterotrophic denitrification.

[0047] Therefore, in order to solve this problem, this embodiment is further improved based on embodiment 1. In this embodiment, the aerobic tank 27 (the left side of the aerobic tank 27 is provided with an inlet pipe 279 for connecting to the pretreatment tank 26, and the right side of the aerobic tank 27 is provided with an outlet pipe 280 for connecting to the sulfur autotrophic denitrification reactor 28) contains an oxygenation component. The oxygenation component enables oxygenation into the aerobic tank 27, thus creating an aerobic environment in the aerobic tank 27.

[0048] Combination Figure 2 As shown, in this embodiment, the oxygenation component includes a horizontal shaft 271 and oxygenation blades 273 located on the horizontal shaft 271. The horizontal shaft 271 can be fixed (e.g., welded) in the aerobic tank 27. The left end of the horizontal shaft 271 extends from the left end of the aerobic tank 27 and is welded to the left side wall of the aerobic tank 27. The right end of the horizontal shaft 271 is stuck on the right inner wall of the aerobic tank 27.

[0049] In this embodiment, nine sets of oxygen-filling blades 273 are fixed on the horizontal axis 271. The nine sets of oxygen-filling blades 273 are arranged along the length of the horizontal axis 271, with three oxygen-filling blades 273 in each set, and the three oxygen-filling blades 273 are evenly distributed around the horizontal axis 271. Of course, in other embodiments, the number of sets of oxygen-filling blades 273 and the number of blades in each set can be modified according to the actual situation.

[0050] In this embodiment, the length of the nine sets of oxygenating blades 273 gradually decreases from left to right. Each oxygenating blade 273 has multiple air outlets 278. Since the length of the oxygenating blades 273 decreases sequentially from left to right, the number of air outlets 278 on each oxygenating blade 273 also decreases sequentially from left to right. An air inlet is located at the left end of the horizontal shaft 271, and the air inlet is connected to an air inlet pipe 276. Gas chambers are located inside both the horizontal shaft 271 and the oxygenating blades 273, and these gas chambers are interconnected.

[0051] In this embodiment, the aerobic tank 27 is fixedly connected with multiple partitions 272 for separating the laterally adjacent oxygenating blades 273. There are eight partitions 272 in this embodiment. The front and rear ends of the eight partitions 272 are fixedly connected to the inner walls of the front and rear sides of the aerobic tank 27. For example, the inner walls of the front and rear sides of the aerobic tank 27 have vertical slots, and the partitions 272 are vertically engaged in these slots. In this embodiment, the bottom of the partitions 272 does not abut (do not contact) the bottom of the aerobic tank 27, and the top of the partitions 272 does not extend to the top of the aerobic tank 27 (the top of the aerobic tank 27 can be open or closed). Thus, the top and bottom of the aerobic tank 27 are in a laterally connected state. In this embodiment, the height of the partitions 272 gradually decreases from left to right, and the vertical height of the partitions 272 is adapted to the length of the oxygenating blades 273.

[0052] Thus, oxygen is introduced into the horizontal shaft 271 through the air inlet pipe 276. The oxygen enters the gas chamber inside the horizontal shaft 271 and the gas chamber inside the oxygenation blade 273. The oxygen flows out from the air outlet 278 of different oxygenation blades 273, thereby realizing the oxygenation of different parts of the aerobic pool 27, so that the aerobic pool 27 has a certain amount of oxygen.

[0053] Meanwhile, in this embodiment, the length of the multiple oxygenating blades 273 gradually decreases from left to right, and the number of air outlets 278 on the oxygenating blades 273 gradually decreases from left to right. This results in a gradual decrease in the oxygen content emanating from the oxygenating blades 273 from left to right. Consequently, the distribution of oxygen emanating from the aerobic tank 27 gradually decreases from left to right. This ensures that the part of the aerobic tank 27 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. This avoids the effluent from the aerobic tank 27 from bringing in too much oxygen after entering the sulfur autotrophic denitrification reactor 28, which would damage the anoxic environment of the sulfur autotrophic denitrification reactor 28. This helps to ensure that sulfur autotrophic denitrification proceeds smoothly.

[0054] Furthermore, in this embodiment, the baffle 272 separates the laterally adjacent oxygenating blades 273. The baffle 272 hinders the lateral diffusion of oxygen emanating from the oxygenating blades 273, preventing rapid lateral diffusion and ensuring that the oxygen emanating from the oxygenating blades 273 can preferentially disperse vertically in the space between two adjacent baffles 272. This facilitates the formation of a gradually decreasing oxygen concentration distribution step in the aerobic tank 27 from left to right. In this embodiment, the top and bottom of the aerobic tank 27 are laterally connected, so the arrangement of the baffle 272 does not completely affect the lateral flow of the liquid.

[0055] Alternatively, transverse liquid passage holes 274 can be provided on each of the partitions 272. The liquid passage holes 274 allow the liquid between adjacent partitions 272 to flow laterally, preventing the partitions 272 from completely blocking the lateral diffusion of oxygen and liquid, thus allowing oxygen to diffuse laterally and facilitating its lateral distribution. However, regardless of the method, due to the obstruction of the lateral diffusion of liquid and oxygen by the partitions 272, the diffusion rate of oxygen in the vertical direction is greater than that in the lateral direction. Therefore, the oxygen concentration in the aerobic tank 27 in the lateral direction mainly depends on the amount of oxygen emitted by the oxygenating blades 273 at the corresponding locations, and the oxygen concentration in the aerobic tank 27 still shows a decreasing trend from left to right. Example 3

[0056] This embodiment is a further improvement on embodiment 2. In this embodiment, the horizontal shaft 271 is rotatably connected to the aerobic tank 27. Specifically, the left end of the horizontal shaft 271 extends from the left inner wall of the aerobic tank 27 without being welded to the left inner wall of the aerobic tank 27. A sealing element, such as rubber, is provided on the left inner wall of the aerobic tank 27 to prevent liquid leakage from the part of the horizontal shaft 271 that protrudes from the left side of the aerobic tank 27. The right end of the horizontal shaft 271 and the right inner wall of the aerobic tank 27, as well as the horizontal shaft 271 and the partition plate 272, can all be rotatably connected by bearings.

[0057] In this embodiment, the aerobic tank 27 is externally equipped with a drive mechanism for rotating the horizontal shaft 271. This drive mechanism, used to drive the horizontal shaft 271, can take various forms; this embodiment describes one such form. For example, the drive mechanism includes a drive motor (not shown in the figure), a driving gear (not shown in the figure), and a driven gear 275. The drive 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, with the driving gear and driven gear 275 meshing. Of course, other drive methods can be used in other embodiments. In this embodiment, the air inlet pipe 276 and the air inlet at the left end of the horizontal shaft 271 are rotatably engaged. Specifically, the air inlet pipe 276 is inserted into the air inlet, and the air inlet pipe 276 and the horizontal shaft 271 can rotate relative to each other.

[0058] In this embodiment, when the horizontal axis 271 rotates, the oxygenating blade 273 rotates and pushes the liquid to the right. This is relatively easy to achieve, for example, by designing the oxygenating blade 273 as a spiral (similar to a ship's propeller), or by tilting the oxygenating blade 273 onto the horizontal axis 271 when the surface of the oxygenating blade 273 is flat. Figure 2 As shown, the so-called inclined setting means that while the surface of the oxygenation blade 273 is perpendicular to the bottom of the aerobic tank 27, the surface of the oxygenation blade 273 is not parallel to the left and right side walls of the aerobic tank 27.

[0059] Therefore, when the sewage treatment system is working, the drive motor drives the active gear to rotate, the active 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 sets of oxygenating blades 273 to rotate. During the rotation of the oxygenating blades 273, the liquid is stirred vertically, which is beneficial to the vertical dispersion of oxygen in the space between adjacent partitions 272. Simultaneously, the oxygenating blades 273 rotate, exerting a rightward thrust on the liquid, thereby driving some oxygen to diffuse towards the sulfur autotrophic denitrification reactor 28. This replenishes the oxygen in the aerobic tank 27 near the sulfur autotrophic denitrification reactor 28. The oxygen replenished to the right can move to the part of the liquid on the right side that has not been agitated or oxygenated by the shortened oxygenating blades 273. This avoids the situation where the oxygenating blades 273 in the aerobic tank 27 near the sulfur autotrophic denitrification reactor 28 gradually shorten, resulting in a low oxygen distribution in the part of the aerobic tank 27 near the sulfur autotrophic denitrification reactor 28 (the part where the liquid cannot be agitated or oxygenated by the shortened oxygenating blades 273).

[0060] It should be noted that although the rotation of the oxygenating blades 273 pushes the liquid and oxygen in the aerobic tank 27 to the right, the oxygen concentration in the aerobic tank 27 in the lateral direction mainly depends on the amount of oxygen emitted from the oxygenating blades 273 at the corresponding location. The amount of oxygen moving laterally to the right in the aerobic tank 27 has a relatively small impact on the oxygen concentration at the corresponding location of the aerobic tank 27 compared to the oxygen emitted from the oxygenating blades 273. Therefore, the overall oxygen concentration in the aerobic tank 27 still shows a decreasing trend from left to right. Example 4

[0061] The basics are as follows: Figures 3-6 As shown: This embodiment improves the sulfur autotrophic denitrification reactor 28. Specifically, the sulfur autotrophic denitrification reactor 28 in this embodiment is a fluidized bed reactor for wastewater treatment, including a vertical tank 1. The tank 1 has a circular shape when viewed from above. A base 2 is installed at the bottom of the tank 1, which improves the stability of the tank 1. An inlet device 4 is installed at the bottom of the tank 1. The inlet device 4 is a vortex inlet device. The outlet of the inlet device 4 (the outlet is a nozzle) is inclined upward at 15-20° to the horizontal plane. An inlet pipe 3 is connected to the inlet device 4. The inlet pipe 3 is located on the left side of the tank 1 and is used to connect to the aerobic tank 27. In this embodiment, the outlet of the cyclone inlet is placed at an angle of 15-20°. This is because the outlet at this angle can provide upward impact and tangential force, ensuring the full fluidization of the packing material in the fluidization zone, enhancing the contact and mixing of sewage and sulfur powder, improving the cultivation efficiency of granular sludge, and making the sulfur autotrophic denitrification reaction more complete.

[0062] A return pipe 9 is connected to the tank body 1, 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 suction element 18. The suction element 18 is located inside the tank body 1 and divides the interior of the tank body 1 into a clear water zone 7 above the suction element 18 and a fluidization zone 6 below the suction element 18. The fluidization zone 6 is filled with packing material 5, which is sulfur powder. In this embodiment, the suction element 18 is specifically a suction pipe, combined with... Figure 5 As shown, the side wall of the suction pipe is provided with a horizontally arranged suction port 21. There can be multiple suction pipes, which are connected to each other in a certain shape. The specific shape of the connection of multiple suction pipes is not important, and they can be connected in various ways. For example, multiple suction pipes can be arranged horizontally side by side and connected (end to end, or end to end); or the ends of multiple suction pipes can be connected to form a radial pattern, in which case the connection point of the multiple suction pipes is located at the center of the radial pattern.

[0063] 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; one is shown in this embodiment. The fluidization zone 6 has multiple vertically arranged water outlets; in this embodiment, there are four water outlets. Each water outlet has multiple liquid outlet holes, and all water outlets are connected to the return pipe 9. The liquid sucked in by the suction device 18 enters the inlet 4 and each water outlet through the return pipe 9. Specifically, in conjunction with... Figure 6 As shown, the water outlet component in this embodiment includes multiple water outlet branch pipes 8, which are interconnected. The connection method of the multiple water outlet branch pipes 8 can be parallel (the water outlet branch pipes 8 are arranged side-by-side and connected at their ends) or series (the water outlet branch pipes 8 are arranged side-by-side and connected end-to-end). Other connection methods are also possible. The shape of the water outlet component formed by connecting the multiple water outlet branch pipes 8 is not important; any shape is acceptable. In this embodiment, the shape of the water outlet component formed by connecting the multiple water outlet branch pipes 8 is as follows: Figure 6As shown, the lateral portion of the water outlet can extend as far to the left as possible to different lateral portions of the liquid. Different water outlet branch pipes 8 are located at different lateral portions in the front-to-back direction of the tank. In this embodiment, the top view of the tank 1 is circular, and the lengths of each water outlet branch pipe 8 are different, with the branch pipe 8 being longer closer to the diameter of the tank 1. To improve the stability of the water outlet branch pipe 8, in this embodiment, the left end of the water outlet branch pipe 8 is connected to the inner wall of the tank 1. The connection method can be welding or snap-fit. When snap-fitted, a groove is provided on the left inner wall of the tank 1, and the left end of the water outlet branch pipe 8 is snapped into the groove. The water outlet branch pipe 8 is provided with a liquid outlet hole, which is located on the upper surface of the water outlet branch pipe 8. Each water outlet and the return pipe 9 is connected by a branch assembly. In this embodiment, each branch assembly 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 point. Since there are four water outlets in this embodiment, there are four branch components in this embodiment, and the four branch components are arranged from top to bottom.

[0064] Therefore, it contains NO3 - Wastewater containing -N enters the inlet 4 through the inlet pipe 3. The wastewater flows out of the inlet 4 at an angle and continues to flow upward. The wastewater and SO undergo sulfur autotrophic denitrification in the fluidization zone 6. The purified water overflows into the clear water zone 7. The water in the clear water zone 7 is more stable and cleaner than the liquid in the sulfurization zone 6.

[0065] Simultaneously, the circulating pump 10 is started. Water from the top of the fluidizing zone 6 enters the suction unit 18 laterally through the horizontal suction port 21, and flows to the right through the suction unit 18 into the return pipe 9. Part of the liquid in the return pipe 9 enters the four branch components, and part flows downward to the bottom of the return pipe 9 and back into the inlet 4, from which it is sprayed out. In this way, part of the water sprayed out of the inlet 4 comes from the inlet pipe 3 and part comes from the return pipe 9. Compared to only water from the inlet pipe 3 spraying out of the inlet 4, the water volume sprayed out of the inlet 4 is greater, and the water sprayed out of the inlet 4 is more abundant. This gives the water in the fluidizing zone 6 a greater upward impact force, which is conducive to the upward flow of water in the fluidizing zone 6, so that the water and the packing 5 are fully mixed, thereby improving the fluidization effect of the fluidizing zone 6.

[0066] The water at the top of the fluidization zone 6 is drawn in by the suction device 18. The suction device 18 exerts an upward suction force on the water in the fluidization zone 6 as a whole. In this way, the suction device 18 at the top of the fluidization zone 6 draws the water upward, and the water inlet 4 at the bottom of the fluidization zone 6 sprays the water upward at an angle. This facilitates the upward flow of water in the fluidization zone 6, reduces the settling of SO, improves the fluidization effect, and allows SO and wastewater to mix better, making the sulfur autotrophic denitrification reaction more complete.

[0067] In addition, the liquid in the return pipe 9 enters the branch components to the left, and the liquid in each branch component enters the corresponding outlet. The liquid flows out from the outlet at different heights, and the liquid flowing out from the outlet can impact the liquid at different heights in the fluidization zone 6. This causes the middle of the fluidization zone 6 to be impacted at different heights and no longer calm, which is beneficial to the mixing and contact of water and packing 5. Compared with the existing technology, where only the top and bottom of the fluidization zone 6 are subjected to greater force, while the middle of the fluidization zone 6 is subjected to weaker force, this solves the problem of poor fluidization effect in the middle of the fluidization zone 6, and improves the fluidization effect in the middle of the fluidization zone 6. Example 5

[0068] This embodiment is a further improvement on embodiment 4, combining... Figure 3 , Figure 4 As shown, in this embodiment, each connecting pipe 11 is connected to a sampling pipe 13, and the sampling pipe 13 is equipped with a second valve 20. The end of the sampling pipe 13 away from the connecting pipe 11 is connected to a sampling box 14.

[0069] Therefore, during normal fluidization, the second valve 20 is closed and the first valve 16 is open, so liquid flows out of the outlet but does not flow out of the sampling tube 13.

[0070] When it is necessary to sample the liquid at different heights in tank 1 to test the fluidization effect of the liquid at different heights in tank 1, the first valve 16 at the corresponding height is closed, and the liquid in the return pipe 9 stops entering the branch pipe 17. Then, the second valve 20 is opened, and the liquid around the outlet at the corresponding height enters the outlet through the outlet hole of the outlet, flows to the right into the connecting pipe 11, and finally flows out from the sampling pipe 13, thus realizing the sampling of the liquid at the corresponding height.

[0071] In this embodiment, the water outlet is provided with different numbers of water outlet branch pipes 8 arranged in a front-to-back pattern. The different water outlet branch pipes 8 are located at different parts of the tank body 1 in the horizontal direction. In this way, during the sampling process, the liquid from different parts of the tank body 1 at the corresponding height enters the water outlet, and the liquid flowing out from the sampling pipe 13 is the liquid from different parts of the tank body 1 in the horizontal direction. This makes the sampled liquid come from different parts of the tank body 1, realizing the sampling of liquid from different parts of the water outlet in the horizontal direction. The sampled liquid will not be concentrated from a certain part of the tank body 1, which is beneficial to improving the accuracy of sampling and detection. Example 6

[0072] Before sampling, because 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 suction device 18 (the water in the water suction device 18 comes from the top of the fluidization zone 6), if sampling is performed directly, the collected liquid will not be the liquid outside the water outlet, but the liquid that has just entered the water outlet from the return pipe 9, resulting in a large sampling and detection error.

[0073] Therefore, in order to solve the above problems, this embodiment is further improved based on embodiment 5. In this embodiment, each sampling tube 13 is connected to a drain branch pipe 12, and the ends of multiple drain branch pipes 12 away from the sampling tube 13 are connected to a main drain pipe 15. The main drain pipe 15 is connected to the bottom of the return pipe 9. Each drain branch pipe 12 is equipped with a third valve 19.

[0074] 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 enters the drain branch pipe 12 in sections along the connecting pipe 11 and the sampling pipe 13. The liquid then enters the drain main pipe 15 from the drain branch pipe 12 and flows back to the bottom of the return pipe 9 along the drain main pipe 15, finally entering the water inlet 4. In this way, the liquid that entered the connecting pipe 11 and the water outlet from the return pipe 9 before sampling is discharged, avoiding the situation where the liquid collected during sampling is the liquid that entered the connecting pipe 11 and the water outlet from the return pipe 9, instead of the liquid around the outside of the water outlet.

[0075] After the residual liquid in the connecting pipe 11 and the outlet is discharged, the liquid outside the outlet in the tank 1 enters the outlet. At this time, the third valve 19 is closed and the second valve 20 is opened. The liquid flowing out from the sampling pipe 13 is the liquid around the outside of the outlet in the fluidization zone 6, thus ensuring the accuracy of the sampled liquid and improving the accuracy of sampling and detection.

[0076] In this embodiment, the second valve 20 and the third valve 19 are respectively provided. 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 between the sampling pipe 13 and the drainage branch pipe 12. Specifically, a three-way valve is provided at the connection between the sampling pipe 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 pipe 11 enters the drainage branch pipe 12 or flows directly out of the sampling pipe 13. Example 7

[0077] This embodiment is an improvement upon embodiments 4-6 described above, combined with... Figure 7As shown, the water outlet component in this embodiment includes a main water outlet pipe 22 and multiple branch water outlet pipes 8, which are connected to the main water outlet pipe 22. The branch water outlet pipes 8 are inserted into the tank 1 from the right side, with their right ends extending from the right side of the tank 1. The branch water outlet pipes 8 are rotatably mounted on the tank 1. Specifically, the right side of the tank 1 has a pipe hole, and the branch water outlet pipe 8 and the pipe hole of the tank 1 are rotatably connected via a bearing. To improve the stability of the branch water outlet pipes 8, in this embodiment, the left end of the branch water outlet pipe 8 is rotatably connected to the inner wall of the tank 1. Specifically, the inner wall of the tank 1 is fixedly equipped with a bearing, and the left end of the branch water outlet pipe 8 is connected to the left inner wall of the tank 1 via a bearing. Alternatively, the left side of the inner wall of the tank 1 has a support portion for supporting the left end of the branch water outlet pipe 8. This support portion is, for example, a support groove or support block fixed to the inner wall of the tank 1, and the left end of the branch water outlet pipe 8 is movably positioned on the support portion. A sealing ring is fixed to the right side wall of the tank body 1 by screws or adhesive. The water outlet branch pipe 8 passes through the sealing ring, thus sealing the gap between the water outlet branch pipe 8 and the tank body 1, reducing or preventing water leakage at the pipe hole of the tank body 1. In this embodiment, the main water outlet pipe 22 is provided with a connector that connects to multiple water outlet branch pipes 8. 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). The connector and the water outlet branch pipe 8 are rotatably engaged. To reduce liquid leakage at the connector, a sealing ring can also be fixedly installed at the connector to seal the connection between the connector and the right end of the water outlet branch pipe 8. Each outlet branch pipe 8 is coaxially connected (e.g., welded or keyed) to a driven sprocket 23. A driving sprocket 25 is located on the outside of each outlet branch pipe 8. A chain 24 connects the multiple driven sprockets 23 and the driving sprocket 25. A motor (not shown) is located on the outside of the tank body 1 to drive the driving sprocket 25. In some embodiments, a speed reducer may be provided between the driving sprocket 25 and the motor, resulting in a slower speed at which the motor drives the driving sprocket 25. The connecting pipe 11 is connected to the main outlet pipe 22.

[0078] Therefore, during the water discharge process, the motor drives the drive sprocket 25 to rotate, and the drive sprocket 25 drives multiple driven sprockets 23 to rotate via the chain 24. The driven sprockets 23 drive the corresponding water outlet branch pipes 8 to rotate. The water outlet branch pipes 8 rotate laterally on the tank body 1, thereby causing the liquid on the water outlet branch pipes 8 to spray out in different directions, avoiding the problem of continuous upward spraying and the occurrence of spray dead angles due to a single direction, which is beneficial to improving the fluidization effect.

[0079] Meanwhile, during sampling, as the outlet branch pipe 8 rotates, the position of the liquid outlet hole on the outlet branch pipe 8 changes continuously with the rotation of the outlet branch pipe 8. This allows not only the liquid above the outlet branch pipe 8 to enter the outlet branch pipe 8, but also the liquid on the horizontal side and below the outlet branch pipe 8 to enter the outlet branch pipe 8. This enables sampling to be carried out on the upper, lower, left, and right sides of the outlet branch pipe 8, resulting in more uniform sampling and more accurate sampling detection.

[0080] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described 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 allows for the utilization of sulfur resources, 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. 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. The part of the secondary sedimentation tank containing the supernatant mixture is connected to the aerobic tank. The anaerobic tank contains sulfate-reducing bacteria, and the anaerobic tank uses the action of the sulfate-reducing bacteria to reduce SO4 2- to S 2- ; The anaerobic tank contains S 2- The water enters the secondary sedimentation tank, and the supernatant mixture in the secondary sedimentation tank is returned to the aerobic tank. The aerobic tank contains sulfur-oxidizing bacteria, which utilize the action of these bacteria to remove sulfur from the liquid returning 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; The aerobic tank contains an oxygenation component, which includes a horizontal axis and multiple oxygenation blades located on the horizontal axis. The multiple oxygenation blades are arranged along the length of the horizontal axis, and the length of the multiple oxygenation blades gradually decreases from the pretreatment tank to the sulfur autotrophic denitrification reactor. The oxygenation blades are provided with multiple air outlets, and the horizontal axis is provided with an air inlet connected to an air inlet pipe. Both the horizontal axis and the oxygenation blades are provided with gas chambers, and the gas chambers inside the horizontal axis and the gas chambers inside the oxygenation blades are connected. The horizontal shaft is rotatably connected to the aerobic tank, and the outside of the aerobic tank is provided with a drive mechanism for driving the horizontal shaft to rotate; the oxygenation blades rotate to push the liquid toward the sulfur autotrophic denitrification reactor.

2. The wastewater treatment system based on sulfur autotrophic denitrification for the utilization of sulfur resources according to claim 1, characterized in that: The aerobic tank is fixedly connected with multiple partitions for separating the horizontally adjacent oxygenating blades, and the top and bottom of the aerobic tank are horizontally connected.

3. The wastewater treatment system based on sulfur autotrophic denitrification for the utilization of sulfur resources according to claim 2, characterized in that: The height of the baffle gradually decreases from the pretreatment tank to the sulfur autotrophic denitrification reactor.

4. The wastewater treatment system based on sulfur autotrophic denitrification for the utilization of sulfur resources according to claim 2, characterized in that: Each of the partitions is provided with a horizontal liquid passage hole.

5. The wastewater treatment system based on sulfur autotrophic denitrification for the utilization of sulfur resources according to claim 2, 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.

6. The wastewater treatment system based on sulfur autotrophic denitrification for the utilization of sulfur resources according to claim 1, characterized in that: The oxygen-filling blades are spiral-shaped or inclinedly arranged on the horizontal axis.

7. The wastewater treatment system based on sulfur autotrophic denitrification for the utilization of sulfur resources according to claim 1, characterized in that: The drive mechanism includes a drive motor, a drive gear, and a driven gear. The drive motor and the drive gear are coaxially fixed, the driven gear is coaxially fixed with the horizontal shaft, and the drive gear and the driven gear mesh.

8. The wastewater treatment system based on sulfur autotrophic denitrification for the utilization of sulfur resources according to claim 1, characterized in that: The sulfur autotrophic denitrification reactor includes a vertical tank. A water inlet is located at the bottom of the tank, connected to a water inlet pipe. A return pipe is connected to the tank, with its lower end connected to the water inlet and its upper end connected to a suction element. The suction element is located inside the tank, dividing the tank into a clear water zone above the suction element and a fluidization zone below it. A circulation pump is installed on the return pipe. The fluidization zone has multiple vertically arranged water outlets with multiple liquid outlet holes, all connected to the return pipe. The liquid drawn in by the suction element enters the water inlet and each water outlet through the return pipe.

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