Industrial wastewater efficient flocculation phosphorus removal and precipitation device

Abstract

This utility model relates to the field of sedimentation device technology and discloses an efficient flocculation and phosphorus removal sedimentation device for industrial wastewater. It includes a fixed plate with two corresponding rectangular mounting plates fixedly connected to its upper surface. Sedimentation components are mounted on the two rectangular mounting plates. Each sedimentation component includes a pretreatment tank. The pretreatment tank's filtration structure removes large impurities. A first stirring tank uses high-speed stirring to ensure thorough mixing and flocculation of the reagent and wastewater. A second stirring tank uses low-speed stirring to promote the combination of magnetic powder and flocs, accelerating sedimentation. The inclined structure of the sedimentation tank and the filter plate achieve efficient solid-liquid separation, forming a complete treatment process: pretreatment followed by reagent flocculation, reagent flocculation followed by magnetic powder-assisted sedimentation, and magnetic powder-assisted sedimentation followed by sedimentation separation. Compared to traditional flocculation sedimentation devices, the addition of magnetic powder significantly shortens sedimentation time. The difference in rotation speed between the two first stirring tanks ensures effective reaction at each stage. The design of the inclined filter plate and guide plate prevents impurity blockage and facilitates solid residue discharge.

Description

Technical Field

[0001] This utility model relates to the field of sedimentation device technology, specifically to a high-efficiency flocculation and phosphorus removal sedimentation device for industrial wastewater. Background Technology

[0002] In industrial production such as chemical, metallurgical, and food processing, the discharge of phosphorus-containing wastewater is one of the main causes of eutrophication of water bodies. According to the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB18918-2002) and the "Integrated Wastewater Discharge Standard" (GB8978-1996), the total phosphorus discharge concentration of industrial wastewater must be strictly controlled below 0.5 mg / L. Flocculation and sedimentation has become the mainstream process for phosphorus removal from industrial wastewater due to its simple operation and controllable cost. Its core requirements for treatment equipment are concentrated in four aspects: First, pretreatment interception, which requires efficient removal of large impurities in wastewater, such as slag, fiber, and solid residues, to avoid clogging of subsequent equipment; second, efficient mixing, which ensures that PAC and PAM reagents react fully with phosphorus ions to generate stable flocs; third, rapid sedimentation, which shortens the floc settling time to increase the treatment capacity; and fourth, stable separation, which ensures thorough solid-liquid separation and minimal fluctuations in effluent quality.

[0003] Currently, existing industrial wastewater phosphorus removal devices mainly adopt a structure of a single stirred tank and a natural sedimentation tank. The specific technical solution is as follows: the single stirred tank is equipped with 2-4 flat stirring blades, which are driven by a motor to mix wastewater and reagents. The mixed wastewater and floc mixture is directly discharged into a rectangular sedimentation tank, where the flocs settle naturally by their own gravity. The supernatant overflows from the top of the tank, and the bottom sludge is periodically removed by manual cleaning or a mechanical scraper. However, the flat stirring blades of the single stirred tank can only form a unidirectional circumferential water flow. Dead zones are easily formed in the gap between the tank wall and the stirring shaft. Wastewater and reagents cannot fully contact each other in the dead zone areas. In some areas, the reagent concentration is too high, causing the flocs to agglomerate and clump together. In other areas, the concentration is insufficient, resulting in incomplete phosphorus ion reaction. The final total phosphorus concentration in the effluent often fluctuates between 0.8-1.5 mg / L, making it difficult to consistently meet the standards. The phosphorus removal efficiency is only 60%-70%. Utility Model Content

[0004] Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a high-efficiency flocculation and phosphorus removal sedimentation device for industrial wastewater. This solves the problem that current industrial wastewater phosphorus removal devices mainly employ a single stirred tank and a natural sedimentation tank. The specific technical solution is as follows: The single stirred tank is equipped with 2-4 flat stirring blades, driven by a motor to mix wastewater and chemicals. The mixed wastewater and flocs are directly discharged into a rectangular sedimentation tank, where the flocs settle naturally due to gravity. The supernatant overflows from the top of the tank, and the bottom sediment is periodically removed manually or by a mechanical scraper. However, the flat stirring blades in the single stirred tank can only create a unidirectional circumferential water flow. Dead zones easily appear between the tank wall and the stirring shaft, preventing sufficient contact between wastewater and chemicals. In some areas, the chemical concentration is too high, causing flocs to agglomerate; in other areas, the concentration is insufficient, resulting in incomplete phosphorus ion reaction. Ultimately, the total phosphorus concentration in the effluent often fluctuates between 0.8-1.5 mg / L, making it difficult to consistently meet standards, and the phosphorus removal efficiency is only 60%-70%.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: an efficient flocculation and phosphorus removal sedimentation device for industrial wastewater, comprising a fixed plate, two mounting rectangular plates arranged in a front-to-back configuration fixedly connected to the upper surface of the fixed plate, sedimentation components being provided on the two mounting rectangular plates, the sedimentation components including a pretreatment tank, the pretreatment tank being fixedly connected to the opposite sides of the two mounting rectangular plates; Among them, a waste inlet pipe communicating with the interior is fixedly connected to the rear side of the upper surface of the pretreatment box, and a second inclined filter plate is fixedly connected to the front and rear inner walls of the pretreatment box. The second inclined filter plate is set to be inclined forward. An inclined guide plate is fixedly connected to the front inner wall of the pretreatment box. The front end of the inclined guide plate is fixedly connected to the bottom of the pretreatment box. A pretreatment box discharge pipe communicating with the interior is fixedly connected to the rear side of the lower surface of the pretreatment box. Among them, mounting plates are fixedly connected to the opposite faces of the two mounting rectangular plates.

[0006] Preferably, the upper surface of the mounting plate is fixedly connected to the first mixing tank, and the lower end of the pretreatment box discharge pipe penetrates into the interior of the first mixing tank; The front surface of the rectangular plate mounted on the front side is fixedly connected to a first drive motor, and the output end of the first drive motor is fixedly connected to a stirring shaft. The rear end of the stirring shaft rotates through the interior of the first stirring tank and is rotatably connected to the inner wall of the first stirring tank. The outer wall of the stirring shaft is fixedly connected with four concave stirring plates arranged in a cross shape, and the arc-shaped parts of the four concave stirring plates are all in contact with the inner wall of the first stirring tank. Each of the four concave stirring plates has multiple stirring teeth fixedly connected to the side facing the stirring shaft.

[0007] Preferably, a PAC / PAM reagent inlet pipe communicating with the interior of the first mixing tank is fixedly connected to the left side of the mixing tank; Among them, an L-shaped mounting plate is fixedly connected to the right side of the mounting plate, a horizontal centrifugal pump is fixedly connected to the upper surface of the L-shaped mounting plate, a discharge conveying pipe is fixedly connected to the input end of the horizontal centrifugal pump, and the end of the discharge conveying pipe away from the horizontal centrifugal pump is fixedly connected to the first mixing tank. The output end of the horizontal centrifugal pump is fixedly connected to a delivery pipe.

[0008] Preferably, a second mixing tank is fixedly connected to the right side of the mounting rectangular plate located on the right side, the conveying pipe is fixedly connected to the second mixing tank, and a second drive motor is fixedly connected to the upper surface of the second mixing tank; Among them, the output end of the second drive motor is fixedly connected to a drive rod, the lower end of the drive rod rotates and penetrates into the interior of the second mixing tank, and multiple sets of fixed rods are fixedly connected to the outer wall of the drive rod; One set of fixing rods consists of four fixing rods arranged in a cross shape, and the outer walls of multiple fixing rods are fixedly connected with multiple serrations.

[0009] Preferably, the lower surface of the second mixing tank is fixedly connected to a discharge pipe communicating with its interior, and the lower surface of the discharge pipe is fixedly connected to an L-shaped connecting pipe communicating with its interior. The rear surface of the second mixing tank is fixedly connected to a magnetic powder addition pipe that communicates with its interior.

[0010] Preferably, a sedimentation tank is fixedly connected to the opposite faces of the two mounting rectangular plates, the bottom of the sedimentation tank is inclined forward, and a first inclined filter plate, which is also inclined forward, is fixedly connected to the front and rear inner walls of the sedimentation tank. The front end of the L-shaped connecting pipe extends into the interior of the sedimentation tank, and the L-shaped connecting pipe is located below the first inclined filter plate.

[0011] Preferably, the front surface of the sedimentation tank is fixedly connected to two discharge pipes that communicate with its interior, and both discharge pipes extend through the front surface of the corresponding mounting rectangular plate.

[0012] Preferably, a drain pipe communicating with the interior of the sedimentation tank is fixedly connected to the right side of the sedimentation tank, and the drain pipe is located above the first inclined filter plate.

[0013] (III) Beneficial Effects Compared with the prior art, this utility model provides a high-efficiency flocculation and phosphorus removal precipitation device for industrial wastewater, which has the following beneficial effects: Large impurities are removed by setting up a filter structure in the pretreatment tank. High-speed stirring in the first mixing tank ensures thorough mixing and flocculation of the reagent and wastewater. Low-speed stirring in the second mixing tank promotes the combination of magnetic powder and flocs, accelerating sedimentation. The inclined structure of the sedimentation tank and the filter plate achieve efficient solid-liquid separation, forming a complete treatment process of reagent flocculation after pretreatment, magnetic powder-assisted sedimentation after reagent flocculation, and sedimentation separation after magnetic powder-assisted sedimentation. Compared with traditional flocculation and sedimentation devices, the addition of magnetic powder significantly shortens the sedimentation time. The speed difference between the two first mixing tanks ensures the reaction effect of each stage. The design of the inclined filter plate and guide plate avoids impurity blockage and facilitates the discharge of solid residue, further improving the phosphorus removal efficiency and treatment stability of industrial wastewater. It is suitable for the efficient purification treatment of industrial wastewater. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the high-efficiency flocculation phosphorus removal and precipitation device for industrial wastewater according to this utility model; Figure 2 This is a schematic diagram of the entire utility model from the right side. Figure 3 This is a schematic diagram of the interior of the pretreatment box of this utility model; Figure 4 This is a schematic diagram of the interior of the second mixing tank of this utility model.

[0015] In the diagram: 1. Fixed plate; 2. Rectangular mounting plate; 3. Mounting plate; 4. First drive motor; 5. First mixing tank; 6. PAC / PAM reagent input pipe; 7. Pretreatment tank; 8. Second drive motor; 9. Drive rod; 10. Magnetic powder addition pipe; 11. Second mixing tank; 12. Discharge pipe; 13. L-shaped connecting pipe; 14. Sedimentation tank; 15. Conveying pipe; 16. Discharge conveying pipe; 17. Pretreatment tank discharge pipe; 18. Horizontal centrifugal pump; 19. L-shaped mounting plate; 20. First inclined filter plate; 21. Stirring shaft; 22. Second inclined filter plate; 23. Inclined guide plate; 24. Stirring teeth; 25. Concave stirring plate; 26. Fixed rod; 27. Serrated edge. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-4This utility model provides a new technical solution: an efficient flocculation and phosphorus removal precipitation device for industrial wastewater, including a pretreatment tank discharge pipe 17: the pretreatment tank discharge pipe 17 is fixedly connected to the rear side of the lower surface of the pretreatment tank 7, and the lower end of the pretreatment tank discharge pipe 17 penetrates into the interior of the first mixing tank 5. The pretreatment tank discharge pipe 17 is a conveying channel for pretreated wastewater, accurately conveying the wastewater after intercepting impurities to the first mixing tank 5, thereby realizing the seamless connection between the pretreatment and flocculation processes.

[0018] Mounting plate 3: Mounting plate 3 provides lifting support for the first mixing tank 5 and the L-shaped mounting plate 19, ensuring that the first mixing tank 5 is at a suitable processing height, and at the same time provides indirect support for the horizontal centrifugal pump 18, ensuring the structural stability of the mixing and conveying process.

[0019] First mixing tank 5: The inner wall of the first mixing tank 5 is rotatably connected to the stirring shaft 21. The first mixing tank 5 is the core area for wastewater flocculation. Through high-speed stirring (180r / min), PAC (flocculator) and PAM (coagulant aid) are fully mixed with the wastewater, allowing phosphorus ions in the wastewater to form flocculent precipitates, laying the foundation for subsequent phosphorus removal.

[0020] First drive motor 4: The first drive motor 4 is fixedly connected to the front surface of the mounting rectangular plate 2 located at the front. The output end of the first drive motor 4 is fixedly connected to the stirring shaft 21 (speed 180r / min). The first drive motor 4 is the source of stirring power for the first mixing tank 5. It drives the stirring shaft 21 to rotate at high speed through the output end, providing power for the full mixing of the reagent and wastewater, and ensuring that the flocculation reaction is uniform and efficient.

[0021] Stirring shaft 21: Four concave stirring plates 25 arranged in a cross shape are fixedly connected to the outer wall of the stirring shaft 21. The stirring shaft 21 transmits the rotational power of the first drive motor 4, driving the concave stirring plates 25 to rotate inside the tank, thereby realizing the stirring and mixing of wastewater and reagents.

[0022] Concave stirring plate 25: The concave stirring plate 25, through its arc-shaped structure that fits the tank wall, prevents wastewater from remaining on the tank wall. At the same time, the stirring teeth 24 further cut and disperse the wastewater, enhance the uniformity of mixing, and ensure that the reagent and wastewater are mixed without dead corners.

[0023] Stirring teeth 24: Multiple stirring teeth 24 are fixedly connected to the side of the concave stirring plate 25 facing the stirring shaft 21. During the stirring process, the stirring teeth 24 increase the contact area with the wastewater, break up the wastewater agglomerates, and enable the PAC / PAM agent to react more fully with the wastewater, improve the flocculation effect, and reduce the reaction dead zone.

[0024] PAC / PAM reagent inlet pipe 6: PAC / PAM reagent inlet pipe 6 is fixedly connected to the left side of the first mixing tank 5 (communicating with the inside of the tank). PAC / PAM reagent inlet pipe 6 is used to accurately deliver flocculant (PAC) and coagulant aid (PAM) into the first mixing tank 5 to provide reagents for the flocculation reaction of phosphorus ions. It is a key pipeline for achieving phosphorus removal.

[0025] L-shaped mounting plate 19: The L-shaped mounting plate 19 is fixedly connected to the right side of the mounting plate 3. The horizontal centrifugal pump 18 is fixedly connected to the upper surface of the L-shaped mounting plate 19. The L-shaped mounting plate 19 provides a stable mounting support for the horizontal centrifugal pump 18, ensuring that the pump body does not vibrate or shift when pumping the mixture, and ensuring the stability of the conveying process.

[0026] Horizontal centrifugal pump 18: The horizontal centrifugal pump 18 is the power source for transporting the mixed liquid. It draws the mixed liquid that has completed the flocculation reaction in the first mixing tank 5 through the discharge conveying pipe 16, and then transports it to the second mixing tank 11 through the conveying pipe 15, so as to realize the connection between the flocculation process and the magnetic powder sedimentation process.

[0027] Discharge conveying pipe 16: One end of the discharge conveying pipe 16 is fixedly connected to the input end of the horizontal centrifugal pump 18, and the other end of the discharge conveying pipe 16 is fixedly connected to the first mixing tank 5 (communicating with the inside of the tank). The discharge conveying pipe 16 is the conveying channel between the first mixing tank 5 and the horizontal centrifugal pump 18, which stably conveys the flocculated mixture in the tank to the pump body to ensure that there is no leakage during the conveying.

[0028] Conveying pipe 15: Conveying pipe 15 is the conveying channel between horizontal centrifugal pump 18 and second mixing tank 11, which accurately conveys the extracted flocculated mixture to the second mixing tank 11 to provide materials for the magnetic powder sedimentation process.

[0029] Second mixing tank 11: The inner wall of the second mixing tank 11 is rotatably connected to the drive rod 9. The second mixing tank 11 is the core area for the combination of magnetic powder and flocs. By stirring at low speed (40r / min), the magnetic powder and flocs are fully combined to form magnetic flocs, which accelerates the subsequent sedimentation speed and avoids the flocs that have been formed by high-speed stirring.

[0030] Second drive motor 8: The second drive motor 8 is the source of stirring power for the second mixing tank 11. It drives the drive rod 9 to rotate at low speed through the output end, providing power for the gentle mixing of magnetic powder and flocs, ensuring the bonding effect without damaging the floc structure.

[0031] Drive rod 9: Multiple sets of fixed rods 26 are fixedly connected to the outer wall of drive rod 9. Drive rod 9 transmits the rotational power of the second drive motor 8, driving the fixed rods 26 to rotate at low speed inside the tank, thereby achieving gentle stirring of magnetic powder and flocculation mixture.

[0032] Fixed rod 26: Multiple sets of fixed rods 26 are fixedly connected to the outer wall of the drive rod 9. Each set of fixed rods 26 consists of four fixed rods 26 arranged in a cross shape. Multiple serrations 27 are fixedly connected to the outer wall of the multiple fixed rods 26. The fixed rods 26 expand the stirring range through the cross distribution, and the serrations 27 enhance the disturbance to the mixture, ensuring that the magnetic powder is evenly dispersed and fully contacts the flocs. At the same time, the low-speed rotation avoids breaking up the formed flocs.

[0033] Serration 27: Multiple serrations 27 are fixedly connected to the outer wall of the fixed rod 26. During low-speed stirring, the serrations 27 gently cut the mixture, break up the magnetic powder agglomerates, and enable the magnetic powder to combine more evenly with the flocs to form a denser magnetic flocs, creating conditions for subsequent rapid sedimentation.

[0034] Magnetic powder inlet pipe 10: The magnetic powder inlet pipe 10 is fixedly connected to the rear surface of the second mixing tank 11. The magnetic powder inlet pipe 10 is used to accurately deliver magnetic powder into the second mixing tank 11, providing raw materials for the formation of magnetic flocs. It is a key pipeline for achieving rapid sedimentation.

[0035] Discharge pipe 12: The discharge pipe 12 is fixedly connected to the lower surface of the second mixing tank 11. An L-shaped connecting pipe 13 communicating with the interior of the discharge pipe 12 is fixedly connected to the lower surface of the discharge pipe 12. The discharge pipe 12 is the conveying channel of the magnetic floc mixture, which conveys the mixture after magnetic powder bonding to the L-shaped connecting pipe 13, realizing the connection between the magnetic powder assisted sedimentation and sedimentation separation process.

[0036] L-shaped connecting pipe 13: The L-shaped connecting pipe 13, through its deflection design, accurately delivers the magnetic flocculent mixture output from the second stirring tank 11 to the bottom area of ​​the settling tank 14, preparing for subsequent solid-liquid separation.

[0037] Sedimentation tank 14: Sedimentation tank 14 is the core area for solid-liquid separation. The inclined bottom and the first inclined filter plate 20 guide the magnetic flocs to slide forward and be discharged. The supernatant is discharged through the drain pipe, realizing the efficient separation of wastewater and magnetic flocs after phosphorus removal.

[0038] First inclined filter plate 20: The first inclined filter plate 20 is fixedly connected to the front and rear inner walls of the sedimentation tank 14 (set to tilt forward). The first inclined filter plate 20 prevents the magnetic flocs from floating up. At the same time, the inclined structure makes it easy for the magnetic flocs to slide forward to the discharge pipe under the action of gravity, ensuring thorough solid-liquid separation and avoiding the magnetic flocs from being discharged with the supernatant and affecting the quality of the effluent.

[0039] Furthermore, when using this industrial wastewater high-efficiency flocculation phosphorus removal and precipitation device, the first drive motor 4 rotates at a speed of 180 r / min, and the second drive motor 8 rotates at a speed of 40 r / min. First, the industrial wastewater to be treated is injected into the pretreatment tank 7 through the waste inlet pipe on the rear side of the upper surface of the pretreatment tank 7. After entering, the wastewater flows through the second inclined filter plate 22. The second inclined filter plate 22 can intercept large suspended impurities in the wastewater, such as mud, sand, and solid residues, to prevent impurities from entering the subsequent first mixing tank and causing pipeline blockage or wear of the mixing components. The filtered wastewater flows forward along the inclined guide plate 23 and is finally transported to the first mixing tank 5 through the pretreatment tank outlet pipe 17 on the rear side of the lower surface of the pretreatment tank, thus completing the pretreatment process of the wastewater. The first drive motor 4 is started, and its output end drives the stirring shaft 21 inside the first mixing tank 5 to rotate at a speed of 180 r / min. The four concave stirring plates 25 set on the outer wall of the stirring shaft 21 rotate synchronously with it. The arc of the concave stirring plate 25 fits against the inner wall of the first mixing tank 5, which can prevent wastewater from remaining on the tank wall. At the same time, the multiple stirring teeth 24 on the side of the concave stirring plate 25 facing the stirring shaft can further cut and disperse the wastewater, enhancing the uniformity of mixing. At this time, flocculant (PAC) and coagulant aid (PAM) are added into the tank through the PAC / PAM reagent input pipe 6 on the left side of the first mixing tank 5. The reagents and wastewater are fully mixed under high-speed stirring. The phosphorus ions in the wastewater react with PAC to generate flocculent precipitates such as aluminum phosphate and iron phosphate, while PAM promotes the agglomeration and growth of flocs, laying the foundation for subsequent phosphorus removal. The process involves starting the horizontal centrifugal pump 18 on the L-shaped mounting plate 19, drawing the flocculated mixture from the first mixing tank 5 to the conveying pipe 15 via the discharge conveying pipe 16, and then conveying it to the second mixing tank 11 via the conveying pipe 15. Magnetic powder is then added to the tank through the magnetic powder inlet pipe 10 on the rear surface of the second mixing tank 11. The second drive motor 8 is then started, and its output end drives the drive rod 9 to rotate at a low speed of 40 r / min. Multiple sets of cross-shaped fixing rods 26 on the outer wall of the drive rod 9 rotate with it. Multiple serrations 27 on the outer wall of the fixing rods 26 can gently stir the mixture, ensuring that the magnetic powder and flocs are fully combined to form magnetic flocs and accelerate the sedimentation speed. This also avoids high-speed stirring from breaking up the already formed flocs. Low-speed stirring can also prevent the magnetic powder from settling and accumulating at the bottom of the tank, ensuring uniform contact between the magnetic powder and the mixture. In this process, after the mixed liquid completes magnetic powder bonding in the second mixing tank 11, it flows into the L-shaped connecting pipe 13 through the discharge pipe 12 on the lower surface, and is then transported to the interior of the sedimentation tank 14 from the front end of the L-shaped connecting pipe 13. The bottom of the sedimentation tank 14 is inclined forward, and the first inclined filter plate 20 inside is also inclined forward. Due to its high density, the magnetic flocs will quickly settle to the bottom of the sedimentation tank and below the first inclined filter plate 20, and slide forward along the inclined surface. The clarified supernatant, with most of the phosphorus and suspended matter removed, is located on the upper side of the first inclined filter plate 20 and is discharged through the drain pipe on the right side of the sedimentation tank 14. It can then enter the subsequent deep treatment or be discharged in compliance with standards. The deposited magnetic flocs and impurities are discharged through the two discharge pipes on the front surface of the sedimentation tank 14, realizing solid-liquid separation and completing the entire flocculation, phosphorus removal and sedimentation process. The process involves removing large impurities through the filtration structure of the pretreatment tank 7, achieving thorough mixing and flocculation of the reagent and wastewater through high-speed stirring in the first mixing tank 5, promoting the combination of magnetic powder and flocs through low-speed stirring in the second mixing tank 11, and accelerating sedimentation through the inclined structure of the sedimentation tank 14 and the filter plate. This forms a complete treatment process: reagent flocculation after pretreatment, magnetic powder-assisted sedimentation after reagent flocculation, and sedimentation separation after magnetic powder-assisted sedimentation. Compared with traditional flocculation and sedimentation devices, the addition of magnetic powder significantly shortens the sedimentation time. The difference in rotation speed between the two first mixing tanks ensures the reaction effect of each stage. The design of the inclined filter plate and guide plate avoids impurity blockage and facilitates the discharge of solid residue, further improving the phosphorus removal efficiency and treatment stability of industrial wastewater. This method is suitable for the efficient purification treatment of industrial wastewater.

[0040] Example 1: Application of a stepped filter pretreatment box with self-cleaning scraper in metallurgical wastewater treatment scenarios The phosphorus-containing wastewater generated by a metallurgical plant contains a large amount of metal scrap, slag and other large impurities. The single inclined filter plate of the traditional pretreatment box is prone to clogging of the mesh due to the accumulation of impurities, requiring the machine to be stopped and cleaned every hour, which seriously affects the treatment efficiency. Moreover, the blockage of impurities will cause uneven feeding in the subsequent first mixing tank, affecting the stability of the flocculation reaction. At this time, the original single second inclined filter plate was replaced with a stepped inclined filter plate with a self-cleaning scraper, and a backwash pipe was added to the side wall of the pretreatment box. The stepped filter plate intercepts impurities in stages through two layers of filter screens with different pore sizes. The upper layer intercepts large particles of slag, while the lower layer intercepts fine debris, reducing the clogging pressure of a single layer of filter screen. The self-cleaning scraper on the upper surface of the filter plate slides synchronously with the flow of wastewater, pushing accumulated impurities toward the inclined guide plate to avoid clogging of the mesh. Combined with regular flushing by the backwash pipe on the side wall, the cleaning cycle of the pretreatment box is greatly extended, the frequency of shutdown for cleaning is significantly reduced, and the stability of continuous operation is improved. The wastewater after grading and filtration has a more uniform impurity content. When it is transported to the first mixing tank through the discharge pipe of the pretreatment box, the feeding speed will not be fast or slow due to impurity fluctuations. This ensures a stable mixing ratio of PAC / PAM agent and wastewater, resulting in a more uniform flocculation reaction and reducing the problem of uneven floc size caused by uneven feeding. The stepped structure allows impurities of different particle sizes to accumulate in layers, enabling the separate collection of metal scraps and slag during cleaning. This facilitates subsequent resource recycling, reduces solid waste treatment costs, and meets the requirements of a circular economy.

[0041] Example 2: Application of a device with ultrasonic oscillation and inclined tube sedimentation components in low-temperature, low-turbidity wastewater scenarios. In winter, a food processing plant produces phosphorus-containing wastewater with low temperature (approximately 10°C) and low turbidity. Traditional equipment has two major problems: First, at low temperatures, the PAC / PAM reagents have low reactivity, resulting in slow and loose floc formation, and insufficient bonding between the magnetic powder and the flocs in the second mixing tank. Second, the loose flocs settle slowly in the sedimentation tank, leading to high turbidity in the effluent, requiring extended sedimentation time to meet standards. To address this, an ultrasonic vibration module is added to the second mixing tank, and a honeycomb inclined tube sedimentation assembly is installed in the sedimentation tank. The ultrasonic vibration module in the second mixing tank can generate high-frequency vibration while stirring at low speed, breaking up water molecule agglomeration, enhancing the reactivity of PAC / PAM reagents with phosphorus ions, and promoting the rapid formation of fine flocs; the vibration can also disperse magnetic powder agglomerates, making the magnetic powder and flocs more fully contacted, forming magnetic flocs with greater density, and solving the problem of slow reaction at low temperature. The honeycomb inclined tube sedimentation assembly in the sedimentation tank increases the solid-liquid contact area, and the magnetic flocs slide and settle along the inner wall of the inclined tube, shortening the sedimentation path and avoiding the floc diffusion problem of traditional horizontal flow sedimentation. Combined with the original first inclined filter plate, the supernatant and magnetic flocs are separated more thoroughly, the turbidity of the effluent is significantly reduced, and the discharge requirements can be met without extending the sedimentation time, and the treatment capacity is increased compared with the original device.

[0042] The ultrasonic oscillation module works in conjunction with low-speed stirring to avoid damaging the existing magnetic flocs; the inclined tube assembly is made of corrosion-resistant material, suitable for the weakly acidic environment of food wastewater, and will not cause scaling or clogging problems during long-term use, reducing equipment maintenance workload and improving the overall operational stability of the device.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency flocculation and phosphorus removal sedimentation device for industrial wastewater, comprising a fixed plate (1), characterized in that: The upper surface of the fixed plate (1) is fixedly connected to two mounting rectangular plates (2) arranged in a front-to-back manner. The two mounting rectangular plates (2) are provided with sedimentation components, including a pretreatment box (7). The pretreatment box (7) is fixedly connected to the opposite sides of the two mounting rectangular plates (2). Among them, the rear side of the upper surface of the pretreatment box (7) is fixedly connected to the waste inlet pipe that communicates with its interior, and the front and rear inner walls of the pretreatment box (7) are fixedly connected to the second inclined filter plate (22), which is inclined forward. Among them, the front inner wall of the pretreatment box (7) is fixedly connected to an inclined guide plate (23), the front end of the inclined guide plate (23) is fixedly connected to the bottom of the pretreatment box (7), and the rear side of the lower surface of the pretreatment box (7) is fixedly connected to a pretreatment box discharge pipe (17) that communicates with the interior. Among them, the opposite faces of the two mounting rectangular plates (2) are fixedly connected with mounting plates (3).

2. The high-efficiency flocculation and phosphorus removal precipitation device for industrial wastewater according to claim 1, characterized in that: The upper surface of the mounting plate (3) is fixedly connected to the first mixing tank (5), and the lower end of the pretreatment box discharge pipe (17) penetrates into the interior of the first mixing tank (5); Among them, the front surface of the rectangular plate (2) installed on the front side is fixedly connected to the first drive motor (4), the output end of the first drive motor (4) is fixedly connected to the stirring shaft (21), the rear end of the stirring shaft (21) rotates through into the interior of the first stirring tank (5), and rotates to connect with the inner wall of the first stirring tank (5); Among them, four concave stirring plates (25) arranged in a cross shape are fixedly connected to the outer wall of the stirring shaft (21), and the arc of the four concave stirring plates (25) is in contact with the inner wall of the first stirring tank (5); Among them, each of the four concave stirring plates (25) facing the stirring shaft (21) has a number of stirring teeth (24) fixedly connected.

3. The high-efficiency flocculation and phosphorus removal precipitation device for industrial wastewater according to claim 2, characterized in that: The left side of the first mixing tank (5) is fixedly connected to a PAC / PAM reagent inlet pipe (6) that communicates with its interior; Among them, an L-shaped mounting plate (19) is fixedly connected to the right side of the mounting plate (3), a horizontal centrifugal pump (18) is fixedly connected to the upper surface of the L-shaped mounting plate (19), a discharge conveying pipe (16) is fixedly connected to the input end of the horizontal centrifugal pump (18), and the end of the discharge conveying pipe (16) away from the horizontal centrifugal pump (18) is fixedly connected to the first mixing tank (5). The horizontal centrifugal pump (18) is fixedly connected to a delivery pipe (15) at its output end.

4. The high-efficiency flocculation and phosphorus removal precipitation device for industrial wastewater according to claim 1, characterized in that: A second mixing tank (11) is fixedly connected to the right side of the mounting rectangular plate (2) located on the right side. The conveying pipe (15) is fixedly connected to the second mixing tank (11). A second drive motor (8) is fixedly connected to the upper surface of the second mixing tank (11). Among them, the output end of the second drive motor (8) is fixedly connected to the drive rod (9), the lower end of the drive rod (9) rotates through the interior of the second mixing tank (11), and multiple sets of fixed rods (26) are fixedly connected to the outer wall of the drive rod (9). Among them, a set of fixing rods (26) consists of four fixing rods (26) arranged in a cross shape, and the outer walls of multiple fixing rods (26) are fixedly connected by multiple serrations (27).

5. The high-efficiency flocculation and phosphorus removal precipitation device for industrial wastewater according to claim 4, characterized in that: The lower surface of the second mixing tank (11) is fixedly connected to a discharge pipe (12) that communicates with its interior, and the lower surface of the discharge pipe (12) is fixedly connected to an L-shaped connecting pipe (13) that communicates with its interior. Among them, the rear surface of the second mixing tank (11) is fixedly connected to a magnetic powder adding pipe (10) that communicates with its interior.

6. The high-efficiency flocculation and phosphorus removal precipitation device for industrial wastewater according to claim 1, characterized in that: A sedimentation tank (14) is fixedly connected to the opposite sides of the two mounting rectangular plates (2). The bottom of the sedimentation tank (14) is inclined forward. A first inclined filter plate (20) is fixedly connected to the front and rear inner walls of the sedimentation tank (14). The front end of the L-shaped connecting pipe (13) penetrates into the interior of the sedimentation tank (14), and the L-shaped connecting pipe (13) is located below the first inclined filter plate (20).

7. The high-efficiency flocculation and phosphorus removal precipitation device for industrial wastewater according to claim 6, characterized in that: The front surface of the sedimentation tank (14) is fixedly connected to two discharge pipes that communicate with its interior. Both discharge pipes extend through the front surface of the corresponding rectangular plate (2).

8. The high-efficiency flocculation and phosphorus removal precipitation device for industrial wastewater according to claim 6, characterized in that: The sedimentation tank (14) is fixedly connected to a drain pipe that communicates with its interior. The drain pipe is located on the upper side of the first inclined filter plate (20).

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