Gas distribution structure for aeration treatment of printing and dyeing wastewater

Abstract

This utility model relates to the technical field of wastewater treatment equipment, specifically a gas distribution structure for aeration treatment of dyeing and printing wastewater. It includes an annular main air pipe, radial branch aeration pipes, and aeration heads. A spiral guide paddle is installed on the inner wall of the main air pipe, driving a swirling flow via a threaded shaft to evenly distribute the airflow to each branch aeration pipe. The aeration heads employ a tapered channel combined with a microporous ceramic membrane to generate microbubbles, achieving an oxygen utilization rate of 35%-40%. Check valves are installed at the ends of the branch aeration pipes, connected to the aeration heads via threads and sealing gaskets, supporting rapid underwater replacement. A pressure monitor in the main air pipe is linked with water quality sensors and flow control valves in the branch aeration pipes to achieve dynamic adjustment of the aeration volume. A TiO₂ photocatalytic coating on the surface of the aeration heads, combined with a UV lamp, degrades organic matter and prevents clogging. This structure features uniform gas distribution, strong anti-clogging properties, and reduced energy consumption, making it suitable for treating high-concentration dyeing and printing wastewater. It also boasts advantages of high efficiency and intelligent maintenance.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment equipment, specifically to a gas distribution structure for aeration treatment of dyeing and printing wastewater. Background Technology

[0002] In the dyeing and printing industry, wastewater treatment is a crucial step. Dyeing and printing wastewater contains large amounts of organic pollutants and dyes, which are highly harmful to the environment and must be effectively treated before discharge or reuse. While traditional aeration methods can partially solve these problems, they still have some significant shortcomings:

[0003] Uneven gas distribution:

[0004] Traditional aeration systems typically employ a simple branch aeration pipe structure, with gas directly distributed to each branch aeration pipe through the main air pipe. Lacking effective guiding devices, the gas distribution in the water is uneven, with some areas having excessively high oxygen concentrations while other areas suffer from insufficient oxygen supply, thus affecting the overall treatment effect.

[0005] The bubble size is relatively large:

[0006] Most aerators have a simple design, generating large bubbles that cannot fully dissolve in water, resulting in low oxygen transfer efficiency. Large bubbles not only reduce oxygen transfer efficiency but may also cause water flow disturbance, affecting the stability of the treatment process.

[0007] The equipment is susceptible to contamination and damage:

[0008] Existing aeration systems lack effective backflow prevention devices, making it easy for wastewater to flow back into the pipeline system. This leads to internal contamination and corrosion of the equipment, frequent contamination and damage, increased maintenance costs and downtime, and affects the long-term stable operation of the system.

[0009] Lack of real-time monitoring and adjustment mechanisms:

[0010] Many aeration systems are not equipped with real-time monitoring devices, making it impossible to dynamically monitor key parameters such as pressure and water quality. This makes it difficult to adjust according to actual conditions. The lack of real-time monitoring and adjustment mechanisms makes the system unable to respond to changes in a timely manner, resulting in unstable treatment effects and even the risk of exceeding emission standards. Utility Model Content

[0011] (a) Technical problems to be solved

[0012] To address the shortcomings of existing technologies, this invention provides a gas distribution structure for the aeration treatment of dyeing and printing wastewater.

[0013] (II) Technical Solution

[0014] To achieve the above objectives, this utility model provides the following technical solution: A gas distribution structure for aeration treatment of dyeing and printing wastewater according to this utility model includes a main air pipe, branch aeration pipes, and aeration heads. Several branch aeration pipes are provided on the main air pipe. The inner wall of the main air pipe is provided with a spiral guide paddle. The aeration heads adopt a tapered channel and are provided with a microporous ceramic membrane. The aeration heads are installed at the front end of the branch aeration pipes. The front end of the main air pipe is provided with an air inlet pipe.

[0015] Preferably, a check valve is installed at the end of the branch aeration pipe, and the aeration head is installed at the output end of the check valve.

[0016] More preferably, the check valve is connected to the aeration head and the branch aeration pipe by threads, and a sealing gasket is provided at the connection between the check valve and the aeration head and the branch aeration pipe.

[0017] Preferably, the branch aeration pipes are evenly distributed on the outside of the main air pipe at a 120° angle.

[0018] Preferably, a pressure monitor is provided on the main air pipe.

[0019] More preferably, a water quality sensor and a flow regulating valve are installed on the branch aeration pipe, and the water quality sensor is located at the upper end of the flow regulating valve.

[0020] Preferably, the surface of the aeration head is coated with a TiO photocatalytic coating.

[0021] Preferably, one end of the spiral guide propeller passes through the main air pipe and is rotatably connected to the main air pipe through a sealed bearing, and the through end of the spiral guide propeller is provided with a threaded shaft.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, this utility model provides a gas distribution structure for aeration treatment of dyeing and printing wastewater, which has the following beneficial effects:

[0024] High-efficiency gas guidance and distribution:

[0025] The inner wall of the main gas pipe is equipped with a spiral guide vane to guide the gas along a spiral path, increasing the contact time between the gas and the liquid, thereby improving oxygen transfer efficiency. This design not only enhances gas diffusion but also reduces energy loss.

[0026] The branch aeration pipes are evenly distributed outside the main air pipe at a 120° angle to ensure that the gas can evenly cover the entire treatment tank and avoid the problem of excessively high or low oxygen concentration in local areas.

[0027] Prevent backflow and protect equipment safety:

[0028] Each branch aeration pipe is equipped with a check valve at its end, which effectively prevents wastewater from flowing back into the pipeline system, protects the equipment from pollution and damage, extends its service life, and reduces maintenance costs.

[0029] The generation of tiny bubbles improves oxygen mass transfer efficiency:

[0030] The aeration head features a tapered channel design, increasing the gas outlet velocity and facilitating the formation of fine bubbles. The microporous ceramic membrane further refines the bubble size, significantly improving oxygen dissolution and enhancing wastewater treatment efficiency.

[0031] The surface of the aerator is coated with a TiO photocatalytic coating, which generates strong oxidizing free radicals under light conditions, decomposing organic pollutants in the water and improving the water purification effect.

[0032] Easy installation and maintenance:

[0033] The check valve is threaded to the aeration head and branch aeration pipes, and a sealing gasket is placed at the connection to ensure a secure and leak-free connection. This design simplifies the disassembly and assembly process, facilitates daily maintenance and repair, and reduces downtime.

[0034] Real-time monitoring and precise adjustment:

[0035] A pressure monitor is installed on the main air pipe to provide real-time feedback on the internal pressure of the system, helping operators to promptly identify and resolve potential problems and ensure the stable operation of the system.

[0036] The branch aeration pipes are equipped with water quality sensors and flow control valves. The water quality sensors are located above the flow control valves, which can dynamically monitor the water quality and adjust the gas flow as needed to achieve precise control and optimize the treatment effect. Attached Figure Description

[0037] Fig. 1 This is a top view structural diagram of the present invention;

[0038] Fig. 2 This is a half-sectional structural schematic diagram of the present invention;

[0039] In the diagram: 1. Main air pipe; 2. Branch aeration pipe; 3. Air inlet pipe; 4. Aeration head; 5. Check valve; 6. Pressure monitor; 7. Water quality sensor; 8. Flow regulating valve; 9. Threaded shaft; 10. Spiral guide paddle. Detailed Implementation

[0040] 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.

[0041] Please see Figs. 1-2 This utility model discloses a gas distribution structure for aeration treatment of dyeing and printing wastewater, including a main air pipe 1, branch aeration pipes 2, and aeration heads 4. Several branch aeration pipes 2 are provided on the main air pipe 1. The inner wall of the main air pipe 1 is provided with a spiral guide paddle 10. The aeration heads 4 adopt a tapered channel and are provided with a microporous ceramic membrane. The aeration heads 4 are installed at the front end of the branch aeration pipes 2. The front end of the main air pipe 1 is provided with an air inlet pipe 3.

[0042] This technical solution achieves efficient and uniform gas distribution and wastewater treatment through a triple mechanism of spiral flow guidance, gradually narrowing microporous aeration, and flow regulation.

[0043] Gas transport and distribution

[0044] An external air source (such as a Roots blower) is connected to the air inlet pipe 3 through an air guide pipe, which delivers compressed air (pressure 0.3-0.5MPa) to the annular main air pipe 1;

[0045] The spiral guide vane 10 on the inner wall of the main air pipe 1 forces the airflow to form a swirling flow (rotation speed ≥1000rpm), so that the air pressure fluctuation is ≤5% and evenly distributed to each branch aeration pipe 2.

[0046] Bubble generation and diffusion

[0047] The airflow enters the aeration head 4 through the branch aeration pipe 2 and is accelerated to 20-30 m / s in the gradually narrowing channel (e.g., inlet diameter 5 mm → outlet diameter 2 mm);

[0048] High-speed airflow impacts the microporous ceramic membrane (e.g., pore size 5-20μm), breaking it into tiny bubbles with a diameter of 1-3mm;

[0049] During the rising process, the bubbles come into full contact with the wastewater, achieving a dissolved oxygen efficiency of 35%-40% (compared to only 15%-20% for traditional aerator heads).

[0050] Dynamic feedback and adjustment

[0051] The water quality sensor 7 monitors parameters such as dissolved oxygen (DO) and COD in real time and feeds them back to the control system.

[0052] The control system automatically adjusts the opening of the flow regulating valve 8 (adjustment range 0%-120%) based on water quality data to achieve precise aeration.

[0053] Working principle of the preferred technical solution

[0054] Helical guide propeller 10 enhances swirl mechanism

[0055] Fluid dynamics principle: Propeller blades force airflow along a spiral path, creating a centrifugal force field;

[0056] Pressure equalization effect: Centrifugal force makes the airflow evenly distributed to each branch aeration pipe 2, eliminating the "end effect" of traditional straight pipe structure (the air volume at the end is ≤15% lower than that at the beginning).

[0057] Self-cleaning function: The shear force generated by the high-speed swirling flow reduces sludge deposition on the pipe wall.

[0058] Gradient-contraction microporous aerator head with 4-bubble breaking mechanism

[0059] Bernoulli effect: Airflow accelerates in a narrow channel, and static pressure energy is converted into kinetic energy (flow velocity increases by 3-5 times).

[0060] Micropore cutting effect: When high-speed airflow passes through the micropores of the ceramic membrane, it is cut into tiny bubbles;

[0061] Bubble rising dynamics: Small bubbles (1-3mm) have a terminal rising speed of 0.2-0.5m / s and a residence time of 30-60 seconds (compared to only 10-20 seconds for traditional 5-10mm bubbles).

[0062] Check valve 5 anti-backflow mechanism

[0063] Differential pressure drive: During aeration, the airflow pressure (0.3-0.5MPa) pushes open the valve plate (opening pressure ≤0.05MPa);

[0064] Gravity + Elastic Reset: When the machine stops, the valve plate closes quickly under its own weight (material density 1.2-1.5g / cm³) and the elasticity of the sealing ring (closing time ≤0.5 seconds).

[0065] Photocatalytic self-cleaning mechanism

[0066] TiO2 photocatalytic reaction: Under UV lamp irradiation (wavelength 254nm, power 5-10W), TiO2 generates electron-hole pairs, which excite water molecules to generate hydroxyl radicals (・OH).

[0067] Organic matter degradation: • OH oxidation decomposes dye molecules adsorbed on the surface of the ceramic film (degradation efficiency ≥90%).

[0068] Periodic control: The automatic control system turns on the UV lamp for 30 minutes every 24 hours to maintain membrane flux ≥80%.

[0069] 120° Uniform Distribution Optimization Mechanism

[0070] Fluid resistance equalization: When the included angle between adjacent branch aeration pipes is 120°, the difference in airflow distribution resistance coefficient is ≤3%;

[0071] Bubble Coverage Model: Numerical simulations show that this layout enables bubbles to achieve a horizontal overlap rate of 70%-80% and a vertical diffusion depth increase of 20%.

[0072] One end of the spiral guide propeller 10 passes through the main air pipe 1 and is rotatably connected to the main air pipe 1 through a sealed bearing. The other end is provided with a threaded shaft 9, which can be connected to an external servo motor. The speed or direction of the spiral guide propeller 10 can be easily adjusted through the servo motor to adapt to different working conditions.

[0073] Detailed Workflow

[0074] Start-up phase

[0075] The air source is connected to the air inlet pipe 3 through the air guide pipe. When the air source is turned on, compressed air enters the main air pipe 1 through the air inlet pipe 3, and the spiral guide vane 10 forms a vortex.

[0076] Pressure monitor 6 detects air pressure (target value 0.3-0.5MPa), and triggers an alarm if abnormal;

[0077] The control system adjusts the opening of the flow regulating valve 8 of each branch aeration pipe 2 according to the initial water quality data (preset DO=2-4mg / L).

[0078] Aeration treatment stage

[0079] Air enters the aeration head 4 through the branch aeration pipe 2 and the check valve 5, generating tiny bubbles;

[0080] As the bubbles rise, they release oxygen, and microorganisms degrade organic matter (reaction rate formula: r = k·C·DO, where k is the reaction constant).

[0081] Water quality sensor 7 monitors parameters such as DO and COD in real time and feeds them back to the control system (sampling frequency 1 time / minute).

[0082] The control system compares the measured value with the target value, and the PID algorithm dynamically adjusts the flow regulating valve 8 (adjustment accuracy ±5%).

[0083] Maintenance phase

[0084] Pressure abnormality handling: If the pressure fluctuation exceeds ±10%, close the valve of the corresponding branch aeration pipe 2 and check for blockage of aeration head 4;

[0085] Replacement of Aerator 4: Disassemble Aerator 4 underwater by rotating it (torque ≤15N・m) and replace it with a spare part;

[0086] Photocatalytic cleaning: UV lamps automatically activate to degrade contaminants on the ceramic film surface;

[0087] Data logging: The system records operating parameters (air pressure, flow rate, water quality) and generates maintenance logs.

[0088] Downtime

[0089] When the gas supply is shut off, check valve 5 closes within 0.5 seconds to prevent wastewater backflow.

[0090] The control system saves the current operating parameters to provide a reference for the next startup;

[0091] If the machine is to be shut down for an extended period, start the backwashing process (clean water + compressed air) to remove any residual sludge from the pipes.

[0092] 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 gas distribution structure for aeration treatment of dyeing and printing wastewater, characterized in that, It includes a main air pipe (1), branch aeration pipes (2) and aeration heads (4). Several branch aeration pipes (2) are provided on the main air pipe (1). The inner wall of the main air pipe (1) is provided with a spiral guide paddle (10). The aeration head (4) adopts a tapered channel and is provided with a microporous ceramic membrane. The aeration head (4) is installed at the front end of the branch aeration pipe (2). The front end of the main air pipe (1) is provided with an air inlet pipe (3).

2. The gas distribution structure for aeration treatment of dyeing and printing wastewater according to claim 1, characterized in that, The end of the branch aeration pipe (2) is equipped with a check valve (5), and the aeration head (4) is installed at the output end of the check valve (5).

3. The gas distribution structure for aeration treatment of dyeing and printing wastewater according to claim 2, characterized in that, The check valve (5) is connected to the aeration head (4) and the branch aeration pipe (2) by threads, and a sealing gasket is provided at the connection between the check valve (5) and the aeration head (4) and the branch aeration pipe (2).

4. The gas distribution structure for aeration treatment of dyeing and printing wastewater according to claim 1, characterized in that, The branch aeration pipes (2) are evenly distributed on the outside of the main air pipe (1) at an angle of 120°.

5. The gas distribution structure for aeration treatment of dyeing and printing wastewater according to claim 1, characterized in that, A pressure monitor (6) is installed on the main air pipe (1).

6. The gas distribution structure for aeration treatment of dyeing and printing wastewater according to claim 1, characterized in that, A water quality sensor (7) and a flow regulating valve (8) are installed on the branch aeration pipe (2), and the water quality sensor (7) is located at the upper end of the flow regulating valve (8).

7. The gas distribution structure for aeration treatment of dyeing and printing wastewater according to claim 1, characterized in that, The surface of the aeration head (4) is coated with a TiO photocatalytic coating.

8. The gas distribution structure for aeration treatment of dyeing and printing wastewater according to claim 1, characterized in that, One end of the spiral guide propeller (10) passes through the main air pipe (1) and is rotatably connected to the main air pipe (1) through a sealed bearing. The through end of the spiral guide propeller (10) is provided with a threaded shaft (9).

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