Treatment system and method for treating sodium hydrosulfite decolorization wastewater based on activated sludge

Abstract

The application discloses a treatment system and method for treating sodium hydrosulfite decoloring wastewater based on activated sludge, and belongs to the field of sodium hydrosulfite decoloring wastewater treatment. The treatment system for treating sodium hydrosulfite decoloring wastewater based on activated sludge comprises a regulating tank, an aerobic tank and a sedimentation tank, and further comprises an aeration unit arranged in the regulating tank and used for aerating wastewater in the regulating tank, a wastewater pipe and a clean water pipe arranged on the regulating tank, a driving unit arranged in the wastewater pipe, a blocking unit arranged on the clean water pipe, and a regulating unit arranged on the regulating tank and capable of adjusting the sealing area between the blocking unit and the clean water pipe through the driving unit. The application can overcome the problems that the operation process of treating sodium hydrosulfite decoloring wastewater is complex, the treatment cost is high, and the stability of the dilution ratio and the mixing uniformity between clean water and sodium hydrosulfite decoloring wastewater are difficult to guarantee.

Description

Technical Field

[0001] This invention relates to the field of sodium hydrosulfite decolorization wastewater treatment technology, and in particular to a treatment system and method for sodium hydrosulfite decolorization wastewater based on activated sludge treatment. Background Technology

[0002] Sodium hydrosulfite is mainly used as a bleaching agent in the textile industry. After it is used to decolorize fabrics and clothing, the wastewater from this process needs to be treated. This wastewater is commonly referred to in the industry as sodium hydrosulfite decolorization wastewater. Sodium hydrosulfite decolorization wastewater presents several problems, including low biodegradability, sodium hydrosulfite residue, high COD and sulfite concentrations, and high salt content.

[0003] Currently, chemical oxidation is generally used to treat sodium hydrosulfite decolorization wastewater in a single process. However, this method is complicated and expensive because it has to address many of the aforementioned issues at once. Furthermore, the concentrations of COD and sulfite in the treated effluent are still relatively high.

[0004] The activated sludge process, which utilizes microorganisms to treat sodium hydrosulfite decolorization wastewater, requires dilution with clean water before treatment to facilitate subsequent sulfite removal. However, maintaining a stable dilution ratio and uniform mixing between the clean water and the wastewater is challenging, hindering the subsequent treatment of the wastewater by the activated sludge. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of complex operation process, high treatment cost, and difficulty in ensuring the stability of the dilution ratio and the uniformity of mixing between clean water and sodium hydrosulfite decolorization wastewater in the existing technology. Therefore, this invention proposes a treatment system and method for sodium hydrosulfite decolorization wastewater based on activated sludge.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A treatment system for decolorizing sodium hydrosulfite wastewater based on activated sludge includes an equalization tank, an aerobic tank, and a sedimentation tank. It further includes: an aeration unit installed in the equalization tank for aerating the wastewater; a wastewater pipe and a clear water pipe installed on the equalization tank, wherein the wastewater pipe has a drive unit inside, the clear water pipe has a blocking unit, an equalization unit installed on the equalization tank, the equalization unit being able to adjust the sealing area between the blocking unit and the clear water pipe via the drive unit; and a mixing section installed on the equalization tank, the drive unit being able to drive the mixing section to rotate between the wastewater pipe and the clear water pipe.

[0008] To facilitate the aeration of sodium hydrosulfite decolorization wastewater and improve the uniformity of its mixing with clean water during the aeration process, preferably, the aeration unit includes an air inlet pipe fixedly connected to the bottom of the equalization tank. An aeration element is installed on the air inlet pipe, wherein the aeration element includes multiple sets of aeration bases inserted into the air inlet pipe. An aeration disc is connected to the end of each aeration base away from the air inlet pipe. Multiple sets of spiral plates are fixedly connected to the inner wall of each aeration base. The portion of the air inlet pipe located at the bottom of the equalization tank has a uniformly distributed frame structure and is offset to one side within the equalization tank. The aeration base is connected to the air inlet pipe, and a protruding ring is provided on the aeration base to engage with the inner wall of the air inlet pipe.

[0009] To improve the efficiency of uniform mixing between sodium hydrosulfite decolorization wastewater and clean water, preferably, both ends of the wastewater pipe and the clean water pipe at least partially penetrate the side wall of the equalization tank, the wastewater pipe and the clean water pipe are located on the same horizontal plane, and the ends of the wastewater pipe and the clean water pipe closest to the equalization tank are close to each other.

[0010] To facilitate automatic monitoring of the amount of sodium hydrosulfite decolorizing wastewater added, and to fully utilize the kinetic energy of the wastewater during its flow, the drive unit further includes a fixed plate fixedly connected inside the wastewater pipe. A rotating shaft is rotatably connected to the fixed plate. A water wheel is fixedly connected to one end of the rotating shaft near the regulating tank, and the outer wall of the water wheel is in contact with the inner wall of the wastewater pipe. A first driving bevel gear is fixedly connected to one end of the rotating shaft away from the water wheel. A mounting base is fixedly connected to one side of the regulating tank near the wastewater pipe, and a connecting shaft is rotatably connected to the mounting base. One end of the connecting shaft extends into the interior of the wastewater pipe, and a first driven bevel gear meshing with the first driving bevel gear is fixedly connected to one end of the connecting shaft near the wastewater pipe.

[0011] To facilitate adjustment of the amount of clean water added, the blocking unit further includes an adjusting box fixedly connected to the clean water pipe. The adjusting box has two sets of partitions symmetrically fixedly connected inside. A baffle is slidably connected between the two sets of partitions. A spring is fixedly connected between the baffle and the inner wall of the adjusting box. A push block is fixedly connected to the side of the baffle closest to the partition, and a sealing plate is fixedly connected to the inner wall of the partition on the side of the push block away from the spring. The baffle is larger than the clean water pipe. A hole matching the push block is opened on the side of the partition closest to the spring, and the side of the push block away from the baffle is tightly fitted against the inner wall of the adjusting box.

[0012] To facilitate control of the amount of clean water added based on the amount of sodium hydrosulfite decolorization wastewater added, the regulating unit further includes a cylinder fixedly connected to the regulating tank near the wastewater pipe. A reciprocating screw connected to a connecting shaft is rotatably connected inside the cylinder. A piston plate is slidably connected to the reciprocating screw. A protrusion matching the reciprocating screw is fixedly connected to the inner wall of the piston plate. A sealing ring is fixedly connected to the side of the reciprocating screw near the cylinder. Air inlets are centrally symmetrically opened at both ends of the cylinder's sidewall. An exhaust pipe connects the cylinder and the regulating box, with the end of the exhaust pipe near the cylinder symmetrically arranged with the air inlets. The end of the exhaust pipe near the regulating box is located between the partition and the inner wall of the regulating box.

[0013] To improve the mixing efficiency between sodium hydrosulfite decolorization wastewater and clean water, and to make the mixture more evenly distributed in the equalization tank, the mixing unit further includes a drive shaft rotatably connected to the side of the equalization tank near the wastewater pipe. A screw rod is fixedly connected to one end of the drive shaft near the equalization tank, and the screw rod is located at the center of the wastewater pipe and the clean water pipe near the equalization tank. A second driven bevel gear is fixedly connected to one end of the drive shaft away from the screw rod, and a second drive bevel gear meshing with the second driven bevel gear is fixedly connected to the connecting shaft.

[0014] To reduce the resistance encountered by the water turbine during rotation, the system further includes a wind turbine fixedly connected to the connecting shaft. Vent pipes are symmetrically arranged on the side wall of the regulating box, with one end of the vent pipe located on the side wall of the regulating box near the exhaust pipe, and the other end of the vent pipe located above and below the wind turbine.

[0015] To facilitate the treatment of sodium hydrosulfite decolorization wastewater, preferably, the bottom of the regulating tank is connected to the aerobic tank, and the bottom of the aerobic tank is connected to the top of the sedimentation tank, respectively, by a first connecting pipe and a second connecting pipe. The sedimentation tank has an effluent channel wall on its inner wall, an mounting plate is fixedly connected to the top of the sedimentation tank, a central cylinder is fixedly connected to the mounting plate, the bottom of the central cylinder is funnel-shaped, a connecting seat is fixedly connected to the lower part of the inner wall of the central cylinder, a reflector plate is fixedly connected to the side of the connecting seat away from the central cylinder, and a drain pipe connects to the bottom of the sedimentation tank.

[0016] A treatment method for a system based on activated sludge to treat sodium hydrosulfite decolorization wastewater includes the following steps:

[0017] Step 1: Add the sodium hydrosulfite decolorization wastewater and clean water into the equalization tank through the wastewater pipe and clean water pipe;

[0018] Step 2: When the sodium hydrosulfite decolorizing wastewater is added, it will drive the drive unit to rotate. Then, the adjustment unit can adjust the sealing area between the blocking unit and the clean water pipe according to the amount of sodium hydrosulfite decolorizing wastewater added, that is, control the amount of clean water added, so that the sodium hydrosulfite decolorizing wastewater and clean water are added in proportion.

[0019] Step 3: Subsequently, the sodium hydrosulfite decolorization wastewater and clean water form convection in the equalization tank. At the same time, the drive unit drives the mixing unit to rotate between the wastewater pipe and the clean water pipe to stir and transport the sodium hydrosulfite decolorization wastewater and clean water.

[0020] Step 4: When the sodium hydrosulfite decolorization wastewater and clean water flowing into the equalization tank pass through the aeration unit, they form a circulating flow within the equalization tank;

[0021] Step 5: Add the adjusted mixed wastewater to the aerobic tank for aerobic treatment, and then pass it into the sedimentation tank to recycle the sludge and treated wastewater.

[0022] Compared with the prior art, the present invention provides a treatment system and method for treating sodium hydrosulfite decolorization wastewater based on activated sludge, which has the following beneficial effects:

[0023] 1. The treatment system based on activated sludge for treating sodium hydrosulfite decolorization wastewater can monitor the flow rate of sodium hydrosulfite decolorization wastewater through the drive unit when the wastewater is discharged through the wastewater pipe. At the same time, it can make full use of the kinetic energy generated when the sodium hydrosulfite decolorization wastewater flows to provide power for the mixing unit, thereby improving the mixing effect and efficiency of sodium hydrosulfite decolorization wastewater and clean water.

[0024] 2. This treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge can drive an adjustment unit to rotate through a drive unit. The compressed gas in the adjustment unit drives the blocking unit to move inside the clear water pipe. The greater the flow rate of sodium hydrosulfite decolorization wastewater, the greater the distance the blocking unit moves, i.e., the larger the opening area of ​​the clear water pipe. This ensures the stability of the addition ratio between sodium hydrosulfite decolorization wastewater and clear water, further improving the treatment effect of sodium hydrosulfite decolorization wastewater.

[0025] 3. This treatment system based on activated sludge for treating sodium hydrosulfite decolorization wastewater can aerate the sodium hydrosulfite decolorization wastewater and clean water introduced into the equalization tank through an aeration unit. Furthermore, due to the offset setting of the aeration unit on one side, the mixed liquid can be more uniformly mixed and form a circulating flow in the equalization tank, further improving the treatment effect of sodium hydrosulfite decolorization wastewater.

[0026] 4. This treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge involves introducing the mixed liquor regulated in the equalization tank into the aerobic tank, and then treating the wastewater by adding activated sludge. This system not only specifically removes COD and sulfite, but also effectively simplifies the operation process of treating sodium hydrosulfite decolorization wastewater.

[0027] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This invention can overcome the problems of complex operation process, high treatment cost, and difficulty in ensuring the stability of the dilution ratio and the uniformity of mixing between clean water and sodium hydrosulfite decolorization wastewater. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge, as proposed in this invention.

[0029] Figure 2 This is a cross-sectional structural diagram of a treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge, as proposed in this invention.

[0030] Figure 3 This is a top view schematic diagram of the equalization tank in a treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge proposed in this invention.

[0031] Figure 4 This is a partial structural diagram of a treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge, as proposed in this invention. Figure 1 .

[0032] Figure 5 This is a partial cross-sectional schematic diagram of a treatment system for treating sodium hydrosulfite decolorization wastewater based on activated sludge, as proposed in this invention.

[0033] Figure 6 This is a cross-sectional schematic diagram of the regulating box in a treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge, as proposed in this invention.

[0034] Figure 7 This is a partial structural diagram of a treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge, as proposed in this invention. Figure 2 .

[0035] Figure 8 This is a partial cross-sectional schematic diagram of the aeration components and air inlet pipe in a treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge, as proposed in this invention.

[0036] Figure 9 This invention proposes a treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge. Figure 5 A schematic diagram of part A in the diagram.

[0037] In the diagram: 1. Equalization tank; 2. Aerobic tank; 3. Sedimentation tank; 4. First connecting pipe; 5. Second connecting pipe; 6. Cover plate; 7. Air inlet pipe; 8. Butterfly valve; 9. Aeration component; 91. Aeration base; 92. Aeration disc; 93. Spiral plate; 10. Wastewater pipe; 11. Clean water pipe; 12. Fixing plate; 13. Rotating shaft; 14. Water wheel; 15. First drive bevel gear; 16. Mounting base; 17. Connecting shaft; 18. First driven bevel gear; 19. Wind turbine; 20. Second drive bevel gear; 21. Drive shaft 22. Second driven bevel gear; 23. Helical rod; 24. Reciprocating screw; 25. Cylinder; 26. Adjusting box; 27. Air inlet; 28. Exhaust pipe; 29. ​​Piston plate; 30. Protrusion; 31. Sealing ring; 32. Partition plate; 33. Baffle plate; 34. Spring; 35. Push block; 36. Sealing plate; 37. Vent pipe; 38. Activated sludge pipe; 39. Compressed air pipe; 40. Effluent channel wall; 41. Mounting plate; 42. Central cylinder; 43. Connecting seat; 44. Reflector plate; 45. Drain pipe. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] Example 1:

[0041] Reference Figures 1-9 A treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge is disclosed, comprising an equalization tank 1, an aerobic tank 2, and a sedimentation tank 3, and further comprising:

[0042] An aeration unit installed in equalization tank 1 is used to aerate the wastewater in equalization tank 1;

[0043] Wastewater pipe 10 and clean water pipe 11 are installed on the equalization tank 1. At least part of both ends of wastewater pipe 10 and clean water pipe 11 penetrate the side wall of equalization tank 1. Wastewater pipe 10 and clean water pipe 11 are located on the same horizontal plane, and the ends of wastewater pipe 10 and clean water pipe 11 that are close to each other are close to each other. A drive unit is installed inside wastewater pipe 10, and a blocking unit is installed on clean water pipe 11.

[0044] An adjustment unit is installed on the adjustment tank 1. The adjustment unit can adjust the sealing area between the blocking unit and the clear water pipe 11 through the drive unit.

[0045] The mixing section installed on the equalization tank 1 is driven by a drive unit that can rotate between the wastewater pipe 10 and the clean water pipe 11.

[0046] Specifically, refer to Figure 2 , Figure 3 and Figure 8 The aeration unit includes an air inlet pipe 7 fixedly connected to the bottom of the equalization tank 1. A cover plate 6 is provided on the top of the equalization tank 1, and the air inlet pipe 7 passes through the cover plate 6. A butterfly valve 8 is provided on the air inlet pipe 7 to control the aeration of the mixed liquid and the degree of aeration. An aeration element 9 is provided on the air inlet pipe 7, wherein the aeration element 9 includes multiple sets of aeration bases 91 inserted into the air inlet pipe 7. An aeration disc 92 is connected to the end of the aeration base 91 away from the air inlet pipe 7, and multiple sets of spiral plates 93 are fixedly connected to the inner wall of the aeration base 91. Furthermore, the portion of the air inlet pipe 7 located at the bottom of the equalization tank 1 has a uniformly distributed frame structure and is offset to one side within the equalization tank 1. The aeration bases 91 are connected to the air inlet pipe 7, and a protruding ring (unmarked) is provided on the aeration base 91 to engage with the inner wall of the air inlet pipe 7.

[0047] The specific structure of the aeration disc 92 can be found in existing technologies, which are well-known to those skilled in the art and will not be elaborated upon here. The surface of the aeration disc 92 is provided with evenly distributed micropores. When gas is introduced, it generates bubbles through these micropores, increasing the oxygen content in the mixed liquid. Furthermore, the air inlet pipe 7 can be implemented using a T-junction at the position where its direction changes, or it can be an integral unit (achieved through welding, etc.). The aeration base 91 and the air inlet pipe 7 can rotate.

[0048] During operation, when high-pressure air is introduced through the air inlet pipe 7, the high-pressure gas flows through the air inlet pipe 7 and the aeration base 91 to the aeration disc 92, aerating the mixed liquid in the equalization tank 1. As the high-pressure gas flows through the aeration base 91, it also exerts a thrust on the spiral plate 93, causing the aeration disc 92 to rotate during aeration, thus improving the aeration effect on the mixed liquid. Furthermore, due to the offset design of the aeration disc 92, it exerts a thrust on the mixed liquid during aeration, causing it to circulate within the equalization tank 1, resulting in a more uniform mixing of impurities in the wastewater.

[0049] Reference Figure 4 , Figure 5 and Figure 7The drive unit includes a fixed plate 12 fixedly connected inside the wastewater pipe 10. A rotating shaft 13 is rotatably connected to the fixed plate 12. A water wheel 14 is fixedly connected to one end of the rotating shaft 13 near the regulating tank 1, and the outer wall of the water wheel 14 is in contact with the inner wall of the wastewater pipe 10. A first drive bevel gear 15 is fixedly connected to the other end of the rotating shaft 13 away from the water wheel 14. A mounting base 16 is fixedly connected to the side of the regulating tank 1 near the wastewater pipe 10. A connecting shaft 17 is rotatably connected to the mounting base 16, and one end of the connecting shaft 17 extends into the interior of the wastewater pipe 10. A first driven bevel gear 18, which meshes with the first drive bevel gear 15, is fixedly connected to the other end of the connecting shaft 17 near the wastewater pipe 10. The surface of the water wheel 14 is spiral-shaped. The specific structure can refer to the structure in existing hydropower generation technology. When water flows through, it will drive the water wheel 14 to rotate.

[0050] During operation, when the sodium hydrosulfite decolorization wastewater is discharged through the wastewater pipe 10, it will cause the water wheel 14 to rotate when it passes through the water wheel 14. The greater the discharge flow, the faster the water wheel 14 rotates. Subsequently, the water wheel 14 drives the rotating shaft 13 and the first drive bevel gear 15 to rotate synchronously. Due to the meshing of the first drive bevel gear 15 and the first driven bevel gear 18, the first drive bevel gear 15 will drive the first driven bevel gear 18 and the connecting shaft 17 to rotate, converting the kinetic energy of the sodium hydrosulfite decolorization wastewater flow into mechanical energy to power the equipment. This achieves the goal of monitoring the flow rate of sodium hydrosulfite decolorization wastewater while providing energy to the equipment, making it more energy-efficient and environmentally friendly.

[0051] Reference Figures 4-6 The blocking unit includes an adjusting box 26 fixedly connected to the clean water pipe 11. Two sets of partitions 32 are symmetrically fixedly connected inside the adjusting box 26. A baffle 33 is slidably connected between the two sets of partitions 32. A spring 34 is fixedly connected between the baffle 33 and the inner wall of the adjusting box 26. A push block 35 is fixedly connected to the side of the baffle 33 near the partition 32, and a sealing plate 36, slidably connected to the inner wall of the partition 32, is fixedly connected to the side of the push block 35 away from the spring 34. The baffle 33 is larger than the clean water pipe 11. A hole matching the push block 35 is opened on the side of the partition 32 near the spring 34, and the side of the push block 35 away from the baffle 33 is tightly fitted against the inner wall of the adjusting box 26. It should be explained that the distance the baffle 33 moves under different air pressures can be controlled by adjusting the elasticity of the spring 34, thus facilitating the adjustment of the ratio between the sodium hydrosulfite decolorization wastewater and clean water (the dotted line in the attached diagram represents the inner diameter of the clean water pipe 11). When the baffle 33 coincides with the water pipe 11, clean water will not be discharged through the water pipe 11. In addition, the push block 35 and the inner wall of the regulating box 26 are connected in a sealed manner.

[0052] When clean water is introduced, when the air pressure between the push block 35 and the regulating box 26 increases, it will cause the push block 35 to move towards the spring 34. Then, the baffle 33 will partially detach from the clean water pipe 11, and the clean water will flow into the regulating tank 1 through the gap between the baffle 33 and the clean water pipe 11. The higher the air pressure, the greater the distance the baffle 33 moves, that is, the more clean water flows in. (It should be explained that in order to avoid the water flow affecting the movement of the baffle 33, the clean water can flow in by gravity, that is, the clean water flows into the regulating tank 1 under its own action. This method is also more energy-efficient.)

[0053] Reference Figure 5 , Figure 6 and Figure 9 The regulating unit includes a cylinder 25 fixedly connected to the regulating tank 1 near the wastewater pipe 10. A reciprocating screw 24, rotatably connected to a connecting shaft 17, is rotatably connected inside the cylinder 25. A piston plate 29 is slidably connected to the reciprocating screw 24. A protrusion 30 matching the reciprocating screw 24 is fixedly connected to the inner wall of the piston plate 29. A sealing ring 31 is fixedly connected to the side of the reciprocating screw 24 near the cylinder 25. Air inlets 27 are centrally symmetrically opened at both ends of the side wall of the cylinder 25. An exhaust pipe 28 connects the cylinder 25 and the regulating box 26, with the end of the exhaust pipe 28 near the cylinder 25 symmetrically arranged with the air inlets 27. The end of the exhaust pipe 28 near the regulating box 26 is located between the partition plate 32 and the inner wall of the regulating box 26. It should be noted that one-way valves are installed near the air inlets 27 and the exhaust pipe 28 of the cylinder 25; this is a conventional method in the prior art and will not be elaborated upon. The air intake port 27 can only allow air to enter the cylinder 25, and the exhaust pipe 28 can only allow air to exit the cylinder 25. In addition, when the reciprocating screw 24 rotates, the cylinder 25 can also limit the movement of the piston plate 29.

[0054] During operation, when the water turbine 14 drives the connecting shaft 17 to rotate via the first driving bevel gear 15 and the first driven bevel gear 18, it will drive the reciprocating screw 24 to rotate. Under the action of the protrusion 30, the piston plate 29 reciprocates within the cylinder 25. When the piston plate 29 moves to one side, it can compress the gas in the corresponding direction within the cylinder 25 and discharge it into the regulating box 26 through the exhaust pipe 28. This is used to drive the movement of the push block 35 and the baffle 33, thereby controlling the amount of clean water added. The faster the inflow speed of the sodium hydrosulfite decolorizing wastewater, the faster the rotation speed of the reciprocating screw 24, that is, the greater the moving distance of the baffle 33, and the greater the inflow of clean water, so that the sodium hydrosulfite decolorizing wastewater and clean water are added in a certain proportion.

[0055] Reference Figure 3 , Figure 4 and Figure 7The mixing section includes a drive shaft 21 rotatably connected to the side of the equalization tank 1 near the wastewater pipe 10. A screw rod 23 is fixedly connected to one end of the drive shaft 21 near the equalization tank 1, and the screw rod 23 is located at the center of the wastewater pipe 10 and the clean water pipe 11 near the equalization tank 1. A second driven bevel gear 22 is fixedly connected to the other end of the drive shaft 21 away from the screw rod 23. A second drive bevel gear 20 that meshes with the second driven bevel gear 22 is fixedly connected to the connecting shaft 17. The specific structure of the screw rod 23 can be referred to the technical solutions in the prior art, which will be known to those skilled in the art, and will not be described in detail here. The screw rod 23 can convey materials.

[0056] When the sodium hydrosulfite decolorization wastewater is discharged, the second drive bevel gear 20 rotates synchronously with the connecting shaft 17. Under the action of the second driven bevel gear 22, the drive shaft 21 and the screw rod 23 rotate synchronously. At this time, the discharged sodium hydrosulfite decolorization wastewater and clean water will flow to the screw rod 23 through the wastewater pipe 10 and the clean water pipe 11. First, the screw rod 23 can mix the sodium hydrosulfite decolorization wastewater and clean water, and at the same time, it can transport the mixed liquid, so that the mixed liquid flows to various parts of the equalization tank 1 to facilitate the subsequent aeration of the mixed liquid.

[0057] Reference Figure 4 and Figure 5 It also includes a fan wheel 19 fixedly connected to the connecting shaft 17. A vent pipe 37 is symmetrically arranged on the side wall of the regulating box 26. One end of the vent pipe 37 is located on the side wall of the regulating box 26 near the exhaust pipe 28, and the other end of the vent pipe 37 is located above and below the fan wheel 19. The surface of the fan wheel 19 is spiral. When the wind blows towards the fan wheel 19, it will drive the fan wheel 19 to rotate. This is a conventional method in the prior art, so it will not be described in detail. In addition, the size of the vent pipe 37 is smaller than the size of the exhaust pipe 28. This is to prevent the continuous discharge from the exhaust pipe 28 from affecting the movement of the baffle 33.

[0058] During operation, when the gas discharged through the exhaust pipe 28 moves the push block 35 and the baffle 33, some of the gas will be discharged through the vent pipe 37. The greater the gas pressure, the greater the air intake of the vent pipe 37. The discharged gas will eventually be discharged to the impeller 19. Since the impeller 19 is constantly rotating during this process, the discharged gas will only have a pushing effect on the impeller 19. This is to reduce the resistance experienced by the water wheel 14 when it rotates, thereby ensuring the stability of the discharge of sodium hydrosulfite decolorization wastewater.

[0059] Example 2:

[0060] Reference Figures 1-2A treatment system for decolorizing sodium hydrosulfite wastewater based on activated sludge is disclosed. A first connecting pipe 4 and a second connecting pipe 5 connect the bottom of the equalization tank 1 to the aerobic tank 2, and the bottom of the aerobic tank 2 to the top of the sedimentation tank 3, respectively. The flow of the mixed liquor between the first connecting pipe 4 and the second connecting pipe 5 can be achieved by a pump or by a height difference, which is not limited here. An effluent channel wall 40 is provided on the inner wall of the sedimentation tank 3, forming an effluent channel between the sedimentation tank 3 and the effluent channel wall 40. Small holes are opened in the effluent channel wall 40, through which the discharged mixed liquor flows into the effluent channel for the discharge of treated wastewater. In addition, the effluent channel wall 40 and the sedimentation tank 3 are connected in a detachable manner. The top of the sedimentation tank 3 is fixedly connected to the mounting plate 41, and the central cylinder 42 is fixedly connected to the mounting plate 41. The end of the second connecting pipe 5 away from the aerobic tank 2 is inserted into the central cylinder 42. The bottom of the central cylinder 42 is funnel-shaped. The lower part of the inner wall of the central cylinder 42 is fixedly connected to the connecting seat 43. The side of the connecting seat 43 away from the central cylinder 42 is fixedly connected to the reflector plate 44. The bottom of the sedimentation tank 3 is connected to the drain pipe 45.

[0061] The aerobic tank 2 is also equipped with an activated sludge pipe 38 and a compressed air pipe 39 for adding activated sludge and air to the mixed liquor. The microorganisms in the added activated sludge will remove sulfite ions. In addition, the interior of the aerobic tank 2 is equipped with an S-shaped plate to increase the contact area between oxygen and the bacteria in the activated sludge, which is beneficial to the cultivation of the bacteria.

[0062] After being conditioned in equalization tank 1, the sodium hydrosulfite decolorization wastewater is introduced into aerobic tank 2 through the first connecting pipe 4. Activated sludge is then added through activated sludge pipe 38, and air is introduced through compressed air pipe 39. When adding activated sludge, the conditioned wastewater in equalization tank 1 must be added first to allow the sludge to dissolve. The bacteria in the activated sludge can reduce the COD and sulfite concentrations in the mixed wastewater. The mixed liquor and activated sludge are then introduced into the central cylinder 42 of sedimentation tank 3 through the second connecting pipe 5. At this point, the mixed liquor and activated sludge are evenly sprayed onto the effluent channel wall 40 under the action of reflector plate 44. The treated wastewater then flows through the effluent channel to the drain pipe 45, where it is collected for subsequent treatment. The operating cost of wastewater treatment using the activated sludge method is far lower than that using the chemical oxidation method. The activated sludge method only requires aeration, while the chemical oxidation method requires a large amount of chemical reagents, resulting in extremely high costs.

[0063] Example 3:

[0064] This invention also discloses a treatment method for a treatment system based on activated sludge to treat sodium hydrosulfite decolorization wastewater, comprising the following steps:

[0065] Step 1: Add the decolorizing wastewater from sodium hydrosulfite and clean water into the equalization tank 1 through wastewater pipe 10 and clean water pipe 11;

[0066] The decolorizing wastewater from sodium hydrosulfite can be added using a pump, while clean water can be added under its own gravity to control the ratio of clean water to decolorizing wastewater from sodium hydrosulfite.

[0067] Step 2: When the sodium hydrosulfite decolorizing wastewater is added, it will drive the drive unit to rotate. Then, the adjustment unit can adjust the sealing area between the blocking unit and the clean water pipe 11 according to the amount of sodium hydrosulfite decolorizing wastewater added, that is, control the amount of clean water added, so that the sodium hydrosulfite decolorizing wastewater and clean water are added in proportion.

[0068] The greater the flow rate of the sodium hydrosulfite decolorization wastewater, the faster the drive unit rotates, and the greater the thrust generated by the adjustment unit on the blocking unit, that is, the larger the gap between the baffle 33 and the clean water pipe 11, so that the sodium hydrosulfite decolorization wastewater and clean water are added in a certain proportion.

[0069] Step 3: Subsequently, the sodium hydrosulfite decolorization wastewater and clean water form convection in the equalization tank 1. At the same time, the drive unit drives the mixing part to rotate between the wastewater pipe 10 and the clean water pipe 11 to stir and transport the sodium hydrosulfite decolorization wastewater and clean water.

[0070] First, when the sodium hydrosulfite decolorization wastewater and the clean water are in convection, they are mixed relatively evenly. At this time, the screw rod 23 can also stir the convection mixture and generate thrust on some of the mixture. During this process, the mixture will be scattered in various positions of the equalization tank 1, which improves the mixing effect of the sodium hydrosulfite decolorization wastewater and the clean water.

[0071] Step 4: When the sodium hydrosulfite decolorization wastewater and clean water flowing into the equalization tank 1 pass through the aeration unit, they form a circulating flow within the equalization tank 1;

[0072] When the aeration disc 92 aerates the mixed liquid, the airflow will also cause the aeration disc 92 to rotate, which increases the diffusion area of ​​the gas and is beneficial to the aeration and mixing of the mixture.

[0073] Step 5: Add the adjusted mixed wastewater to aerobic tank 2 for aerobic treatment, and then pass it into sedimentation tank 3 to recycle the sludge and treated wastewater.

[0074] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge, comprising an equalization tank, an aerobic tank, and a sedimentation tank, characterized in that, Also includes: The aeration unit installed in the equalization tank is used to aerate the wastewater in the equalization tank. Wastewater pipes and clean water pipes are installed on the equalization tank. The wastewater pipes are equipped with a drive unit inside, and the clean water pipes are equipped with a blocking unit. The regulating unit installed on the regulating tank can adjust the sealing area between the blocking unit and the clear water pipe through the driving unit; The mixing section is installed on the equalization tank, and the driving unit is capable of driving the mixing section to rotate between the wastewater pipe and the clean water pipe. Both ends of the wastewater pipe and the clean water pipe penetrate at least partially through the side wall of the equalization tank. The wastewater pipe and the clean water pipe are located on the same horizontal plane, and the ends of the wastewater pipe and the clean water pipe that are close to the equalization tank are close to each other. The drive unit includes a fixed plate fixedly connected inside the wastewater pipe, a rotating shaft rotatably connected to the fixed plate, a water wheel fixedly connected to the end of the rotating shaft near the regulating tank, and the outer wall of the water wheel fitting against the inner wall of the wastewater pipe; a first drive bevel gear fixedly connected to the end of the rotating shaft away from the water wheel. The regulating tank is fixedly connected to a mounting base on the side near the wastewater pipe. A connecting shaft is rotatably connected to the mounting base, and one end of the connecting shaft extends into the interior of the wastewater pipe. A first driven bevel gear that meshes with a first driving bevel gear is fixedly connected to the end of the connecting shaft near the wastewater pipe. The blocking unit includes an adjusting box fixedly connected to the clean water pipe. Inside the adjusting box, two sets of partitions are symmetrically fixedly connected. A baffle is slidably connected between the two sets of partitions. A spring is fixedly connected between the baffle and the inner wall of the adjusting box. A push block is fixedly connected to the side of the baffle closest to the partition, and a sealing plate is fixedly connected to the side of the push block furthest from the spring, slidably connected to the inner wall of the partition. The baffle is larger than the water pipe. The baffle has a hole on the side near the spring that matches the push block. The side of the push block away from the baffle is in close contact with the inner wall of the adjustment box. The regulating unit includes a cylinder fixedly connected to the side of the regulating tank near the wastewater pipe. The cylinder is rotatably connected to a reciprocating screw connected to a connecting shaft. A piston plate is slidably connected to the reciprocating screw. A protrusion matching the reciprocating screw is fixedly connected to the inner wall of the piston plate. The cylinder sidewall has air inlet holes symmetrically arranged at both ends. An exhaust pipe connects the cylinder and the regulating box. The end of the exhaust pipe near the cylinder is symmetrically arranged with the air inlet holes. The end of the exhaust pipe near the regulating box is located between the partition and the inner wall of the regulating box. The mixing section includes a drive shaft rotatably connected to the side of the equalization tank near the wastewater pipe. A screw rod is fixedly connected to one end of the drive shaft near the equalization tank, and the screw rod is located at the center of the wastewater pipe and the clean water pipe near the equalization tank. A second driven bevel gear is fixedly connected to one end of the drive shaft away from the screw rod. A second drive bevel gear that meshes with the second driven bevel gear is fixedly connected to the connecting shaft.

2. The treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge according to claim 1, characterized in that, The aeration unit includes an air inlet pipe fixedly connected to the bottom of the equalization tank, and an aeration element is installed on the air inlet pipe. The aeration element includes multiple aeration bases inserted into the air inlet pipe. An aeration disc is connected to the end of each aeration base away from the air inlet pipe. Multiple spiral plates are fixedly connected to the inner wall of each aeration base. The portion of the air inlet pipe located at the bottom of the regulating tank has a uniformly distributed frame structure and is set off to one side of the regulating tank. The aeration base is connected to the air inlet pipe, and the aeration base is provided with a protruding ring that engages with the inner wall of the air inlet pipe.

3. The treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge according to claim 1, characterized in that, It also includes a fan wheel fixedly connected to the connecting shaft, and vent pipes are symmetrically arranged on the side wall of the regulating box. One end of the vent pipe is located on the side wall of the regulating box near the exhaust pipe, and the other end of the vent pipe is located above and below the impeller.

4. The treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge according to claim 1, characterized in that, The bottom of the equalization tank is connected to the aerobic tank, and the bottom of the aerobic tank is connected to the top of the sedimentation tank, respectively, by a first connecting pipe and a second connecting pipe. The sedimentation tank has an outlet channel wall on its inner wall, an installation plate is fixedly connected to the top of the sedimentation tank, a central cylinder is fixedly connected to the installation plate, the bottom of the central cylinder is funnel-shaped, a connecting seat is fixedly connected to the lower part of the inner wall of the central cylinder, a reflector plate is fixedly connected to the side of the connecting seat away from the central cylinder, and a drain pipe is connected to the bottom of the sedimentation tank.

5. A treatment method comprising the treatment system for sodium hydrosulfite decolorization wastewater based on activated sludge treatment as described in any one of claims 1-4, characterized in that, It also includes the following steps: Step 1: Add the sodium hydrosulfite decolorization wastewater and clean water into the equalization tank through the wastewater pipe and clean water pipe; Step 2: When the sodium hydrosulfite decolorizing wastewater is added, it will drive the drive unit to rotate. Then, the adjustment unit can adjust the sealing area between the blocking unit and the clean water pipe according to the amount of sodium hydrosulfite decolorizing wastewater added, that is, control the amount of clean water added, so that the sodium hydrosulfite decolorizing wastewater and clean water are added in proportion. Step 3: Subsequently, the sodium hydrosulfite decolorization wastewater and clean water form convection in the equalization tank. At the same time, the drive unit drives the mixing unit to rotate between the wastewater pipe and the clean water pipe to stir and transport the sodium hydrosulfite decolorization wastewater and clean water. Step 4: When the sodium hydrosulfite decolorization wastewater and clean water flowing into the equalization tank pass through the aeration unit, they form a circulating flow within the equalization tank; Step 5: Add the adjusted mixed wastewater to the aerobic tank for aerobic treatment, and then pass it into the sedimentation tank to recycle the sludge and treated wastewater.

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