Microbubble trapping and coupling efficient phosphorus removal system

Abstract

The utility model relates to a microbubble trapping and coupling efficient phosphorus removal system which comprises a secondary sedimentation tank, the secondary sedimentation tank comprises a sedimentation area, and the sedimentation area is communicated with a first water inlet pipeline for introducing sewage to be treated and a plurality of water distribution pipes; the pressure reducing device is arranged below the water distribution pipe, and the pressure reducing device is used for reducing the water outlet impulsive force of the water distribution pipe; and the dephosphorization unit is communicated and connected with the secondary sedimentation tank through a second water inlet pipeline. The dephosphorization device has the effects of relieving water inlet impact force and ensuring stable and efficient dephosphorization performance.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a microbubble trapping coupled with a high-efficiency phosphorus removal system. Background Technology

[0002] Wastewater treatment technology is a crucial component of modern environmental protection. With the continuous increase in industrial and domestic wastewater discharge, efficient and economical wastewater treatment methods and technologies have become a research hotspot. Phosphorus is a significant pollutant in wastewater treatment; excessive discharge can lead to eutrophication of water bodies, subsequently causing ecological problems such as cyanobacteria blooms. Therefore, developing efficient phosphorus removal technologies is of great importance for protecting the ecological environment. Currently, the wastewater treatment industry has developed various phosphorus removal processes. These technologies not only improve wastewater treatment efficiency but also promote the sustainable use of water resources.

[0003] In existing technologies, various methods are commonly used to address the problem of excessive phosphorus content in wastewater, including chemical precipitation, biological phosphorus removal, and physical filtration. Chemical precipitation removes phosphorus by adding chemical agents to the wastewater to form insoluble phosphate precipitates. Biological phosphorus removal utilizes the metabolism of specific microorganisms to transfer phosphorus from wastewater to sludge under alternating anaerobic and aerobic conditions. Physical filtration uses multi-stage filtration devices to adsorb or trap phosphorus particles in the wastewater. Furthermore, some technologies combine sedimentation tanks with filtration units, attempting to improve phosphorus removal efficiency by optimizing water flow paths and increasing reaction time.

[0004] However, the above methods still have some problems in practical applications, especially when treating high-concentration phosphorus-containing wastewater. Traditional sedimentation tanks are prone to sludge turbulence due to excessive influent impact, affecting the sedimentation effect and thus reducing phosphorus removal efficiency. Therefore, how to effectively mitigate the influent impact and ensure stable and efficient phosphorus removal performance has become a technical challenge to be solved. Utility Model Content

[0005] To address the aforementioned technical issues, this application provides a microbubble trapping coupled with a high-efficiency phosphorus removal system.

[0006] The microbubble trapping coupled high-efficiency phosphorus removal system provided in this application adopts the following technical solution:

[0007] The microbubble trapping coupled with a high-efficiency phosphorus removal system includes:

[0008] The secondary sedimentation tank includes a sedimentation zone, which is connected to a first inlet pipe for introducing wastewater to be treated and multiple distribution pipes.

[0009] A pressure-reducing device, disposed below the water distribution pipe, is used to reduce the force of the water flowing out of the water distribution pipe; and

[0010] The phosphorus removal unit is connected to the secondary sedimentation tank via a second inlet pipe.

[0011] By adopting the above technical solution, the connection design between the secondary sedimentation tank and the first inlet pipe and multiple distribution pipes enables the preliminary distribution and sedimentation treatment of wastewater. The pressure reducing device effectively reduces the impact force of the water exiting the distribution pipes, avoiding disturbance to the wastewater in the secondary sedimentation tank, thereby improving the sedimentation effect. The phosphorus removal unit is connected to the secondary sedimentation tank through the second inlet pipe, ensuring that the pretreated wastewater can smoothly enter the phosphorus removal process to achieve the goal of efficient phosphorus removal.

[0012] Preferably, the secondary sedimentation tank further includes an inlet channel, a sludge return channel disposed in the sedimentation zone, and a first outlet pipe. The inlet channel is located at the outlet of the first inlet pipe, and the first outlet pipe is connected to the sedimentation zone.

[0013] By adopting the above technical solution, the secondary sedimentation tank is equipped with an inlet channel, a sludge return channel, and a first outlet pipe, which allows the sewage to be evenly distributed after entering the secondary sedimentation tank, reducing the impact on the sedimentation zone. At the same time, the sludge can be effectively recycled through the sludge return channel, and the first outlet pipe ensures that the clear water after sedimentation treatment is discharged smoothly, thereby improving the sewage treatment efficiency and stability.

[0014] Preferably, the pressure reducing device includes a rectifier assembly and a baffle plate. The rectifier assembly is located directly below the outlet of the water distribution pipe, and the baffle plate is detachably disposed on the periphery of the rectifier assembly. The water distribution pipe, the rectifier assembly, and the baffle plate cooperate to form a curved channel.

[0015] By adopting the above technical solution, the rectifier assembly is positioned directly below the outlet of the water distribution pipe, effectively guiding the water flow direction and reducing its impact force, preventing direct impact on the bottom of the secondary sedimentation tank and thus minimizing disturbance to the deposited sludge. The baffle plate is detachably installed around the rectifier assembly, forming a curved channel with the water distribution pipe and the rectifier assembly, further increasing the tortuosity of the water flow path. This allows for a more uniform reduction in water velocity, improving flow stability and facilitating the installation and maintenance of the baffle plate. This design effectively enhances the sedimentation effect of the secondary sedimentation tank during wastewater treatment, ensuring the stability and reliability of the effluent quality.

[0016] Preferably, there are multiple water distribution pipes, and the cross-section of the rectifier assembly is an inverted trapezoid, including a horizontal pressure reducing plate facing the water distribution pipe and an inclined connecting plate located below the horizontal pressure reducing plate and connected to the horizontal pressure reducing plate. The water flow discharged from the water distribution pipe reaches the horizontal pressure reducing plate for pressure reduction, and the water distribution pipe is provided with a spiral structure inside.

[0017] By adopting the above technical solution, multiple distribution pipes can evenly distribute the wastewater to be treated, improving the system's treatment efficiency. The inverted trapezoidal cross-section design of the rectifier component allows the horizontal pressure-reducing plate and the inclined connecting plate to work together to effectively reduce the impact of the water flow discharged from the distribution pipes, preventing the water flow from impacting subsequent treatment stages and thus improving the stability of wastewater treatment. The horizontal pressure-reducing plate directly connects to the water flow discharged from the distribution pipes to achieve initial pressure reduction, while the inclined connecting plate further guides the water flow direction, ensuring a smooth transition of the water flow.

[0018] Preferably, the phosphorus removal unit includes a chemical dosing reaction zone and a microbubble collection and separation unit. The chemical dosing reaction zone and the microbubble collection and separation unit are connected by an external pipeline. A venting pipeline is provided at the bottom of the chemical dosing reaction zone, and a sludge discharge pipeline is provided at the bottom of the microbubble collection and separation unit.

[0019] By adopting the above technical solution, the phosphorus removal unit is divided into a chemical dosing reaction zone and a microbubble collection and separation unit, connected by external pipelines. This allows wastewater to flow orderly between the two zones, achieving a step-by-step treatment effect. A vent pipe at the bottom of the chemical dosing reaction zone facilitates rapid drainage of the liquid when needed, ensuring ease of system maintenance and operation. A sludge discharge pipe at the bottom of the microbubble collection and separation unit effectively removes sludge generated during filtration, keeping the filtration zone clean and improving phosphorus removal efficiency and system stability.

[0020] Preferably, the dosing reaction zone includes two dosing devices and two vortex reactors, which are arranged in stages.

[0021] By adopting the above technical solution, two dosing devices and two vortex reactors are set up in the chemical dosing reaction zone, and these are arranged in stages to achieve stepwise chemical dosing and multiple mixing reactions of wastewater. This method ensures that the reagents fully contact and react with the phosphorus in the wastewater, improving phosphorus removal efficiency. At the same time, the staged structure helps optimize the reaction process, reduce reagent waste, and ensure a more thorough and stable reaction.

[0022] Preferably, the microbubble collection and separation unit includes a scum scraper and a microbubble generator. The microbubble generator is used to form a bubble filter layer. The scum scraper is disposed above the bubble filter layer and is used to scrape off the floating scum. The clean water from the bubble filter layer is discharged through a second water outlet pipe disposed below.

[0023] By adopting the above technical solution, the microbubble generator forms a bubble filter layer, which can effectively intercept impurities such as phosphorus in the water and improve phosphorus removal efficiency. A scum scraper is installed above the bubble filter layer to promptly remove floating scum, preventing its accumulation from affecting the filtration effect and ensuring the normal operation of the bubble filter layer. The second outlet pipe is used to discharge the clean water treated by the bubble filter layer, ensuring that the effluent water quality meets standards.

[0024] Preferably, the second water outlet pipe is provided with a return pipe, which is connected to the microbubble generator.

[0025] By adopting the above technical solution, the high-efficiency phosphorus removal system for wastewater treatment is equipped with a return pipe that connects the second effluent pipe to the bubble generator. This facilitates the generation and use of bubbles. At the same time, this design helps maintain the stable operation of the bubble filter layer, enhances the phosphorus removal effect, and reduces the system operating cost.

[0026] Preferably, the microbubble generator includes a bubble generating chamber, a stirrer located in the bubble generating chamber, a gas tank, and a bubble collecting chamber. The gas tank, the return pipe, and the bubble collecting chamber are all connected to the bubble generating chamber. The stirrer is used to stir the gas-liquid mixture to generate bubbles. The bubble collecting chamber is connected to a bubble output pipe. The bubble output pipe is provided with multiple bubble outlets, and each bubble outlet is provided with a bubble output component.

[0027] By adopting the above technical solution, the microbubble generator, through the inclusion of a bubble generation chamber, a stirrer, a gas tank, and a bubble collection chamber, can effectively generate and collect microbubbles. The gas tank provides the gas source, the stirrer agitates the gas-liquid mixture to generate bubbles, and the bubble collection chamber collects the generated bubbles and outputs them through a bubble output pipe, thereby forming a stable bubble filtration layer. The rectangular array of bubble outlets allows the bubbles discharged from the outlets to adhere to flocculants over a large area, thus filtering the wastewater. The bubble output component diverts and discharges the bubbles.

[0028] Preferably, a flow stabilizer is provided between every two adjacent bubble output tubes. The flow stabilizer is composed of multiple spaced baffles, which are inclined relative to the bubble output tubes.

[0029] By adopting the above technical solutions, the flow stabilizer can effectively reduce the turbulence of water flow between the bubble output pipes, making the bubble layer more uniform and stable, thereby improving the contact efficiency between phosphorus particles and bubbles; the inclined baffle further optimizes the water flow direction, reduces the generation of eddies, and helps to improve the phosphorus removal effect and reduce energy consumption.

[0030] This application includes at least one of the following beneficial technical effects:

[0031] 1. By installing a pressure reducing device below the first inlet pipe of the secondary sedimentation tank, the impact force of the incoming water is effectively reduced, avoiding the problem of sludge turbulence caused by excessive impact force, thereby significantly improving the sedimentation effect and phosphorus removal efficiency.

[0032] 2. The chemical dosing reaction zone enables stepwise chemical dosing and multiple mixing reactions in wastewater, allowing the chemicals to fully contact and react with the phosphorus in the wastewater, thereby improving phosphorus removal efficiency;

[0033] 3. The microbubble generator, bubble output device, and flow stabilizer improve the adhesion efficiency of bubbles to flocculants. Attached Figure Description

[0034] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0035] Figure 2 yes Figure 1 Enlarged diagram of part A in the middle;

[0036] Figure 3 This is a schematic diagram of the water distribution pipe structure;

[0037] Figure 4 This is a schematic diagram of the flow stabilizer;

[0038] Figure 5 This is an isometric schematic diagram of the flow stabilizer.

[0039] Explanation of reference numerals in the attached drawings: 1. Secondary sedimentation tank; 11. First inlet pipe; 12. Water distribution pipe; 121. Spiral structure; 13. Sedimentation zone; 14. Inlet channel; 15. Sludge return channel; 16. First outlet pipe; 17. Outlet channel; 2. Pressure reducing device; 21. Rectifying assembly; 211. Horizontal pressure reducing plate; 212. Inclined connecting plate; 22. Baffle plate; 3. Phosphorus removal unit; 31. Second inlet pipe; 32. Chemical dosing reaction zone; 321. Chemical dosing device; 322. Vortex reactor; 323. Vent pipe; 3 3. Microbubble collection and separation unit; 331. Sludge scraper; 332. Microbubble generator; 3321. Bubble generation chamber; 3322. Agitator; 3323. Gas tank; 3324. Bubble collection chamber; 3325. Bubble output pipe; 3326. Bubble outlet; 3327. Bubble output component; 333. Bubble filter layer; 334. Second water outlet pipe; 335. Sludge discharge pipe; 336. Return pipe; 337. Flow stabilizer; 3371. Baffle; 4. Triangular weir plate; 5. Ball valve; 6. Water channel structure. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-5 The microbubble trapping coupled high-efficiency phosphorus removal system provided in this application is described in further detail.

[0041] Example 1

[0042] refer to Figure 1 The microbubble capture coupled high-efficiency phosphorus removal system includes a secondary sedimentation tank 1, a pressure reducing device 2, and a phosphorus removal unit 3.

[0043] The original secondary sedimentation tank 1 used a centralized direct-flush water inlet, which significantly disturbed the settled sludge in the tank, causing severe sludge runoff. This resulted in an increased amount of sludge entering the subsequent phosphorus removal unit 3, further leading to a higher dosage of chemicals. The microbubble capture coupled with high-efficiency phosphorus removal system provided in this application can solve the sludge runoff problem in the secondary sedimentation tank 1.

[0044] Secondary sedimentation tank 1 performs the first step of sedimentation treatment on pretreated wastewater. A water channel structure 6 is installed within secondary sedimentation tank 1, which is connected to the sedimentation zone 13 located at the bottom of secondary sedimentation tank 1. The water channel structure 6 includes an inlet channel 14 and an outlet channel 17. The inlet channel 14 is connected to a first inlet pipe 11 through which the wastewater to be treated flows. A ball valve 5 is installed at the inlet of the first inlet pipe 11 to control the water flow and initially reduce the impact force of the incoming water. Wastewater flowing out of the ball valve 5 flows into a pressure reducing device 2. Multiple distribution pipes 12 are connected to the inlet channel 14, arranged at equal intervals. The distribution pipes 12 are L-shaped pipes. The outlet channel 17 is connected to a first outlet pipe 16 that discharges wastewater from the sedimentation zone 13. The sedimentation zone 13 is also equipped with a sludge return channel 15.

[0045] Pressure reducing device 2 is installed below water distribution pipe 12 to reduce the force of the water flowing out of water distribution pipe 12. Specifically, pressure reducing device 2 includes a rectifier assembly 21 and a baffle plate 22. The rectifier assembly 21 includes a horizontal pressure reducing plate 211 installed below water distribution pipe 12 and directly opposite water distribution pipe 12, and an inclined connecting plate 212 supporting the horizontal pressure reducing plate 211. The water flowing out of water distribution pipe 12 flows directly onto the horizontal pressure reducing plate 211, and further passes through the baffle plate 22 to reduce the flow into sedimentation zone 13. Water distribution pipe 12, rectifier assembly 21 and baffle plate 22 work together to form a multi-section curved channel, allowing the gentle sewage to flow into sedimentation zone 13 for sedimentation.

[0046] The phosphorus removal unit 3 is connected to the secondary sedimentation tank 1 via an externally installed second inlet pipe 31, ensuring that the pretreated wastewater can smoothly enter the phosphorus removal process and further achieve efficient phosphorus removal. The phosphorus removal unit 3 includes a chemical dosing reaction zone 32 and a microbubble collection and separation unit 33. Specifically, the chemical dosing reaction zone 32 includes two sets of dosing devices 321 and a vortex reactor 322. Wastewater pre-treated in the secondary sedimentation tank 1 flows into the chemical dosing reaction zone 32 through the second inlet pipe 31. Specifically, the wastewater passes through the first-step dosing device 321, where PAC reagent is initially added. After being stirred by the vortex reactor 322, it flows into the second-step dosing device 321, where PAM reagent is added. After being stirred again by the vortex reactor 322, the wastewater, after flocculation in the chemical dosing reaction zone 32, flows into the microbubble collection and separation unit 33. The wastewater in the chemical dosing reaction zone 32 can be discharged through a vent pipe 323 at the bottom.

[0047] refer to Figures 1-5 The microbubble collection and separation unit 33 includes a scraper 331 and a microbubble generator 332. The microbubble generator 332 and the scraper 331 further treat the flocculated water, improving the solid-liquid separation effect of the chemical phosphorus removal and increasing the phosphorus removal efficiency. Specifically, the microbubble generator 332 includes a bubble generation chamber 3321, a stirrer 3322 located in the bubble generation chamber 3321, a gas tank 3323, and a bubble collection chamber 3324, used to generate microbubbles to form a bubble filter layer 333. Specifically, the second water outlet pipe 334 is equipped with a return pipe 336, which introduces a portion of the qualified clean water from the second water outlet pipe 334 into the bubble generating chamber 3321. The gas tank 3323 is connected to the bubble generating chamber 3321 and introduces gas into it. A motor-driven stirrer 3322 thoroughly stirs the gas-liquid mixture generated by the gas and clean water, thereby producing microbubbles. These microbubbles are discharged into the bubble collecting chamber 3324, which is connected to multiple bubble output pipes 3325. These multiple bubble output pipes 3325 are spaced apart, and a flow stabilizer 337 is installed between every two adjacent bubble output pipes 3325. The flow stabilizer 337 consists of multiple spaced baffles 3371. The system consists of a baffle 3371 that is inclined relative to the bubble output pipe 3325 to discharge microbubbles from the bubble collection chamber 3324. Each bubble output pipe 3325 has multiple bubble outlets 3326 arranged in a rectangular array. Each bubble outlet 3326 is equipped with a bubble output component 3327. The surface of the bubble output component 3327 has multiple spaced through holes. The bubbles discharged by the bubble output component 3327 can adhere to the flocs over a large area, thereby filtering the wastewater. The microbubbles adhere the flocs to the top to form a bubble filter layer 333. The scraper 331 scrapes off the flocs and discharges them through the sludge discharge pipe 335 at the bottom. The filtered water that meets the quality standards is discharged through the second water outlet pipe 334.

[0048] The microbubble capture coupled high-efficiency phosphorus removal system also includes a triangular weir plate 4, which is installed in the second inlet pipe 31 to intercept some sludge and other impurities. The impurities flow back to the sedimentation zone 13 through the sludge return channel 15.

[0049] The implementation principle of the microbubble trapping coupled high-efficiency phosphorus removal system in this application embodiment is as follows: Wastewater enters from the first inlet pipe 11, is depressurized by the pressure reducing device 2, and then flows into the sedimentation zone 13. The settled wastewater flows out from the first outlet pipe 16 set in the outlet channel 17. The wastewater flows into the chemical reaction zone 32 through the second inlet pipe 31 for flocculation, and then enters the microbubble trapping and separation unit 33 for final phosphorus removal. The clean water that meets the water quality standards is discharged through the second outlet pipe 334. This wastewater treatment loop solves the sludge runoff phenomenon caused by direct flushing in the current technology, reduces the disturbance of the inlet water to the settled sludge, improves the sludge runoff phenomenon, reduces the phosphorus content from the source, and reduces the dosage of PAM agent in the subsequent treatment unit accordingly, thus reducing the phosphorus removal pressure. The embodiments of this specific implementation are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A micro-bubble trapping coupled high-efficiency phosphorus removal system, characterized in that, include: Secondary sedimentation tank (1), the secondary sedimentation tank (1) includes a sedimentation zone (13), the sedimentation zone (13) is connected to a first inlet pipe (11) for introducing sewage to be treated and multiple distribution pipes (12); Pressure reducing device (2), the pressure reducing device (2) is located below the water distribution pipe (12), the pressure reducing device (2) is used to reduce the force of the water flowing out of the water distribution pipe (12); as well as The phosphorus removal unit (3) is connected to the secondary sedimentation tank (1) through a second inlet pipe (31).

2. The microbubble trapping and coupling high-efficiency phosphorus removal system according to claim 1, characterized in that: The secondary sedimentation tank (1) also includes an inlet channel (14), a sludge return channel (15) located in the sedimentation zone (13), and a first outlet pipe (16). The inlet channel (14) is located at the outlet of the first inlet pipe (11), and the first outlet pipe (16) is connected to the sedimentation zone (13).

3. The microbubble trapping and coupling high-efficiency phosphorus removal system according to claim 1, characterized in that: The pressure reducing device (2) includes a rectifier assembly (21) and a baffle plate (22). The rectifier assembly (21) is located directly below the outlet of the water distribution pipe (12). The baffle plate (22) is detachably arranged on the periphery of the rectifier assembly (21). The water distribution pipe (12), the rectifier assembly (21) and the baffle plate (22) cooperate to form a curved channel.

4. The microbubble trapping and coupling high-efficiency phosphorus removal system according to claim 3, characterized in that: There are multiple water distribution pipes (12). The cross-section of the rectifier assembly (21) is an inverted trapezoid and includes a horizontal pressure reducing plate (211) facing the water distribution pipe (12) and an inclined connecting plate (212) located below the horizontal pressure reducing plate (211) and connected to the horizontal pressure reducing plate (211). The water flow discharged from the water distribution pipe (12) directly reaches the horizontal pressure reducing plate (211) for pressure reduction. The water distribution pipe (12) is provided with a spiral structure (121).

5. The microbubble trapping and coupling high-efficiency phosphorus removal system according to claim 1, characterized in that: The phosphorus removal unit (3) includes a dosing reaction zone (32) and a microbubble collection and separation unit (33). The dosing reaction zone (32) and the microbubble collection and separation unit (33) are connected by an external pipe. The bottom of the dosing reaction zone (32) is provided with a vent pipe (323), and the bottom of the microbubble collection and separation unit (33) is provided with a sludge discharge pipe (335).

6. The microbubble trapping and coupling high-efficiency phosphorus removal system according to claim 5, characterized in that: The dosing reaction zone (32) includes two dosing devices (321) and two vortex reactors (322), which are arranged in stages.

7. The microbubble trapping and coupling high-efficiency phosphorus removal system according to claim 5, characterized in that: The microbubble collection and separation unit (33) includes a scum scraper (331) and a microbubble generator (332). The microbubble generator (332) is used to form a bubble filter layer (333). The scum scraper (331) is located above the bubble filter layer (333) and is used to scrape off the floating scum. The clean water of the bubble filter layer (333) is discharged through a second water outlet pipe (334) located below.

8. The microbubble trapping coupled high-efficiency phosphorus removal system according to claim 7, characterized in that: The second water outlet pipe (334) is equipped with a return pipe (336), which is connected to the microbubble generator (332).

9. The microbubble trapping and coupling high-efficiency phosphorus removal system according to claim 8, characterized in that: The microbubble generator (332) includes a bubble generating chamber (3321), a stirrer (3322) located in the bubble generating chamber (3321), a gas tank (3323), and a bubble collecting chamber (3324). The gas tank (3323), the return pipe (336), and the bubble collecting chamber (3324) are all connected to the bubble generating chamber (3321). The stirrer (3322) is used to stir the gas-liquid mixture to generate bubbles. The bubble collecting chamber (3324) is connected to a plurality of spaced bubble output pipes (3325). Each bubble output pipe (3325) is provided with a plurality of bubble outlets (3326), and each bubble outlet (3326) is provided with a bubble output component (3327).

10. The microbubble-trapping and high-efficiency phosphorus removal system according to claim 9, characterized in that: A flow stabilizer (337) is provided between every two adjacent bubble output tubes (3325). The flow stabilizer is composed of multiple spaced baffles (3371), which are inclined relative to the bubble output tubes (3325).

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