An oxidation ditch aeration device and method of oxygenation

Abstract

The application provides an oxidation ditch aeration device and an oxygenation method. The oxidation ditch aeration device comprises a float, a support and an aeration assembly. The aeration assembly is installed on the float through the support. The aeration assembly comprises a vertical pipe, a horizontal pipe and a vertical pipe which are communicated with each other. The horizontal pipe and the vertical pipe are horizontally and perpendicularly arranged at the lower part of the support. The vertical pipe is vertically arranged on the central axis of the support. The top end of the vertical pipe is communicated with an air inlet pipe. A plurality of horizontal aeration groups are arranged on the vertical pipe in the height direction at intervals. Each horizontal aeration group comprises a plurality of first aerators which are uniformly arranged along the circumference of the vertical pipe. The first aerators are horizontally arranged. The horizontal pipe and the vertical pipe are both provided with second aerators. The second aerators are vertically arranged. The oxidation ditch aeration device and the oxygenation method can be installed without draining water and the oxygenation effect is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an oxidation ditch aeration device and an oxygenation method. Background Technology

[0002] Activated sludge biological treatment is a major wastewater treatment process. Aerobic treatment involves installing microporous aerators at the bottom of the aerobic tank in an oxidation ditch, allowing oxygen to transfer upwards. The metabolic activity of aerobic microorganisms removes pollutants from the wastewater, achieving nitrogen and phosphorus removal. However, if the microporous aerator pores in the aerobic tank become clogged, or if the underwater aerator is damaged, it's impossible to install the aerator without draining the water. Similarly, if process adjustments require increasing the aeration rate in the aerobic tank, installing underwater microporous aerators is also impossible. Because activated sludge has a long cultivation cycle, draining the water to replace the microporous aerators is not feasible. Therefore, a non-draining aeration device and method are needed to maintain or increase the oxygen levels required for the aerobic process. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an oxidation ditch aeration device and oxygenation method that can be installed without drainage and improve the oxygenation effect.

[0004] To solve the above-mentioned technical problems, in a first aspect, the present invention provides an oxidation ditch aeration device, including a float, a support, and an aeration assembly. The support is mounted on the float, and the aeration assembly is mounted on the support. The aeration assembly includes a vertical pipe, a horizontal pipe, and a longitudinal pipe that are interconnected. The horizontal pipe and the longitudinal pipe are horizontally and perpendicularly arranged at the lower part of the support, and the vertical pipe is vertically arranged on the central axis of the support. The top end of the vertical pipe is connected to an air inlet pipe. Several horizontal aeration groups are spaced apart along the height direction on the vertical pipe. Each horizontal aeration group includes several first aerators evenly arranged along the circumference of the vertical pipe. The first aerators are horizontally arranged. Second aerators are provided on both the horizontal pipe and the longitudinal pipe. The second aerators are vertically arranged.

[0005] Furthermore, a third aerator is provided at the ends of the horizontal and vertical pipes, and the third aerator is inclined upward.

[0006] Furthermore, in two adjacent horizontal aeration groups, the orifice diameter of the first aerator in the lower horizontal aeration group is larger than that of the first aerator in the upper horizontal aeration group.

[0007] Furthermore, the support includes an upper frame and a lower frame, with the lower frame positioned below the upper frame; the upper frame is mounted on the float, and its lower end is below the liquid surface; the lower end face of the upper frame is an upwardly convex arc surface.

[0008] Secondly, the present invention also provides a method for oxygenating an oxidation ditch, employing the oxidation ditch aeration device provided in the first aspect; the oxygenation method includes the following steps:

[0009] Step 10: Without draining the aerobic tank, place the oxidation ditch aeration device into the oxygenation position in the aerobic tank. The float of the oxidation ditch aeration device floats on the liquid surface and is fixed. Connect the air inlet pipe of the oxidation ditch aeration device to the air source, start the air source, and compressed air enters all aerators through the pipeline.

[0010] Step 20: The first aerator on the riser sprays air outward in the horizontal direction at different heights of the riser, forming a first air-water mixture that flows horizontally in all directions, dissolving oxygen from the air into the water.

[0011] Step 30: The second aerators on the horizontal and vertical pipes spray air upwards in the vertical direction, forming a second air-water mixture that flows upwards with the water above, dissolving oxygen from the air into the water.

[0012] In step 40, the upward-flowing second air-water mixture formed by the second aerator and the horizontally flowing first air-water mixture formed by the first aerator collide and merge with each other, continuously transferring oxygen.

[0013] Furthermore, in step 20, the first air-water mixture flowing in the same direction as the water in the pool enhances the oxygen content in the water ahead; the first air-water mixture flowing in the opposite direction to the water in the pool collides and merges with the water, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving dissolved oxygen efficiency; the first air-water mixture flowing in the opposite direction to the water in the pool collides and merges with the sewage, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, forming a new first air-water mixture; the new first air-water mixture changes direction and flows upward and downward, mixing again with the water above and below, transferring oxygen again and improving dissolved oxygen efficiency; the first air-water mixtures at different heights merge into each other throughout the space, allowing the air-water mixtures with different oxygen contents to be redistributed, transferring more oxygen to the water and further improving dissolved oxygen efficiency.

[0014] Furthermore, in step 20, the first aerators at different heights spray air at different speeds to oxygenate the water, forming a first air-water mixture with different dissolved oxygen levels at different heights.

[0015] Furthermore, in step 40, during the upward flow of the second air-water mixture, it first perpendicularly cuts with the first air-water mixture flowing outward from the bottommost first aerator, making the water droplets and bubbles smaller and denser, transferring more oxygen into the water, forming a new air-water mixture; a portion of the new air-water mixture continues to flow upward, while another portion flows outward; the upward-flowing new air-water mixture perpendicularly cuts with the first air-water mixture flowing outward from the second layer's first aerator, transferring more oxygen into the water, forming a renewed air-water mixture; a portion of the renewed air-water mixture continues to flow upward, while another portion flows outward; the upward-flowing renewed air-water mixture perpendicularly cuts with the first air-water mixture flowing outward from the upper first aerator, transferring more oxygen into the water, forming a renewed air-water mixture; and so on, until it passes through all the first aerators, enhancing the mixing and cutting effect of the entire space, redistributing oxygen, and further improving oxygen transfer efficiency.

[0016] Furthermore, it also includes:

[0017] Step 50: The third aerator on the longitudinal pipe sprays air upwards at an angle along the length of the aerobic tank, forming a third air-water mixture with the water body above it. The third air-water mixture, flowing in the same direction as the water in the tank, increases the oxygen content in the water ahead. The third air-water mixture, flowing in the opposite direction to the water in the tank, collides, cuts, merges, and compresses with the water, making the water droplets and bubbles smaller and denser, forming a new air-water mixture, transferring more oxygen to the water, and improving dissolved oxygen efficiency.

[0018] The third aerator on the horizontal pipe tilts upward along the width of the aerobic tank, spraying air upward to form a third air-water mixture with the water above. Part of the third air-water mixture flows upward, while another part continues to flow towards the tank wall due to inertia. When the third air-water mixture reaches the tank wall, it forms a reflected air-water mixture that flows upward and inward under the reflection of the tank wall. This mixture collides and merges with the upward-flowing third air-water mixture formed by the third aerator, the second air-water mixture formed by the second aerator, and the first air-water mixture formed by the first aerator, continuously transferring oxygen.

[0019] Furthermore, it also includes:

[0020] Step 60: When the upward-flowing soda-water mixture reaches the lower end face of the upper frame, the arc surface reflects the soda-water mixture downwards and outwards with the center of the lower end face as the center. The downward- and outward-reflected soda-water mixture collides and merges with the upward-flowing soda-water mixture, and also collides and merges with the soda-water mixture flowing in all directions, making the water droplets and bubbles smaller and denser, further improving the oxygen transfer efficiency.

[0021] This invention provides an oxidation ditch aeration device and oxygenation method. By installing the aeration components on floats, the oxidation ditch aeration device can be installed in an aerobic tank without draining water, ensuring the normal operation of the process. Simultaneously, by installing first aerators horizontally at different heights on the risers to provide horizontal aeration in all directions, and second aerators vertically installed on the horizontal and vertical pipes for vertical aeration, the combination of horizontal and vertical aeration alters the movement direction and path of the air-water mixture, enhancing its mutual cutting effect, increasing dissolved oxygen efficiency, ensuring the dissolved oxygen required by activated sludge and other microorganisms, and improving nitrogen and phosphorus removal efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the oxidation ditch aeration device provided in an embodiment of the present invention.

[0023] The diagram includes: 1. Float; 2. Support; 11. Arc surface; 3. Vertical pipe; 4. Horizontal pipe; 5. First aerator; 6. Second aerator; 7. Third aerator. Detailed Implementation

[0024] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0025] This invention provides an oxidation ditch aeration device, such as... Figure 1 As shown, the device includes a float 1, a support 2, and an aeration assembly. The support 2 is mounted on the float 1, and the aeration assembly is mounted on the support 2. Preferably, the support 2 includes an upper frame and a lower frame, with the lower frame positioned below the upper frame. The upper frame is mounted on the float 1, with its lower end below the liquid surface, and the lower end of the lower frame above the bottom of the tank. When the oxidation ditch aeration device moves, there is no interference between the lower end of the lower frame and the bottom of the tank or the existing microporous aerators, ensuring reliable movement of the oxidation ditch aeration device. Preferably, the lower end face of the upper frame is a centrally convex arc surface 11.

[0026] The aeration assembly includes interconnected risers 3, horizontal pipes 4, and longitudinal pipes. The horizontal pipes 4 and longitudinal pipes are horizontally and perpendicularly arranged at the lower part of the support 2. The horizontal pipes 4 are arranged along the width of the aerobic tank, and the longitudinal pipes are arranged along the length of the aerobic tank. The risers 3 are vertically arranged on the central axis of the support, and the top of the riser is connected to the air inlet pipe. Several horizontal aeration groups are spaced apart along the height of the riser 3. Each horizontal aeration group includes several first aerators 5 evenly arranged along the circumference of the riser, and the first aerators 5 are horizontally arranged. Preferably, the number of horizontal aeration groups is not less than 3 groups, and the number of first aerators 5 in each horizontal aeration group is 4-8. Preferably, the first aerators of all horizontal aeration groups are staggered in the circumferential direction, that is, in the horizontal projection, all the first aerators do not overlap. Second aerators 6 are provided on both the horizontal pipes 4 and the longitudinal pipes, and the second aerators 6 are vertically arranged. Both the first aerators 5 and the second aerators 6 are microporous aerators.

[0027] The first aerator 5 on the riser 3 sprays air outward in a horizontal, circumferential direction at different heights on the riser 3, forming a first air-water mixture with the surrounding water. This first air-water mixture flows horizontally in all directions, dissolving oxygen in the water. Specifically: 1. The first air-water mixture flowing in the same direction as the water in the pool increases the oxygen content in the wastewater ahead. 2. The air-water mixture flowing in the opposite direction to the water in the pool violently collides, cuts, merges, and compresses with the wastewater, making the water droplets and bubbles smaller and denser, forming a new air-water mixture that transfers more oxygen to the water, improving dissolved oxygen efficiency. Then, the new air-water mixture changes direction and moves upward and downward, mixing again with the water flow above and below, transferring oxygen once more and improving dissolved oxygen efficiency. 3. The air-water mixture perpendicular to or at an obtuse angle (inclined to the opposite direction of water flow) collides, cuts, and merges violently with the wastewater, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving dissolved oxygen efficiency. 4. The air-water mixture at an acute angle (inclined to the same direction as water flow) collides, cuts, and merges with the wastewater, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving dissolved oxygen efficiency. 5. The different spray directions of the first aerator 5 at different heights cause the air-water mixtures formed in each layer to merge throughout the space, further distributing the air-water mixtures with different oxygen contents and transferring more oxygen to the water, further improving dissolved oxygen efficiency. This invention overcomes the limitations of existing technologies where microporous aerators are installed at the bottom of the tank. When the aerators spray air upwards to oxygenate the lower wastewater, the upper and middle wastewater is not fully oxygenated before being carried forward by the fluid generated by the flow promoter. Consequently, in the aerobic tank, before the oxygenated water reaches the upstream submersible flow promoter (between the two flow promoters in the flow direction), the dissolved oxygen effect in the upper part of the water is lower than that in the lower part, resulting in an uneven dissolved oxygen efficiency in the vertical direction, which affects the nitrogen and phosphorus removal effect.

[0028] As a preferred example, in two adjacent horizontal aeration groups, the orifice diameter of the first aerator in the lower horizontal aeration group is larger than that of the first aerator in the upper horizontal aeration group. Preferably, the orifice diameter of the first aerator in the lowermost horizontal aeration group is smaller than that of the second aerator.

[0029] In the horizontal aeration group, the air jetting speed of the first aerator gradually increases from bottom to top. The first aerators at different heights spray air at different speeds, oxygenating the water and forming a first air-water mixture with varying dissolved oxygen levels at different heights. The flow velocity of this first air-water mixture also gradually increases from bottom to top. During oxygenation, some air dissolves in the water, while the remaining air continues to flow outwards due to inertia, continuing to oxygenate the water in different directions. Simultaneously, due to its lower density, some air moves upwards, oxygenating the water above. The upward air flow velocity is greater than the downward air flow velocity, causing the upward-moving air-water mixture to cut through the air, making the water droplets and bubbles smaller and denser, transferring more oxygen into the water and further improving the dissolved oxygen efficiency, thus enhancing the dissolved oxygen effect in the vertical direction. The cut air continues to flow upwards, continuously oxygenating the water above.

[0030] The second aerator 6 on the horizontal and vertical pipes sprays air vertically upwards, forming a second air-water mixture that flows upwards, dissolving oxygen from the air into the water. This upward-flowing second air-water mixture first cuts into the first air-water mixture flowing outwards from the lowest layer, formed by the first aerator 5. The two air-water mixtures are perpendicular to each other in space, causing intense collisions and cutting, making the water droplets and bubbles smaller and denser, transferring more oxygen into the water, and forming a newer air-water mixture. Because the air sprayed from the first aerator 5 is faster than that from the second aerator 6, while the newer air-water mixture continues to move upwards, a portion of it also flows outwards. The upward-flowing air-water mixture intersects with the first air-water mixture flowing outwards from the first aerator 5 in the second layer. The two air-water mixtures are perpendicular to each other in space. Because the air-water mixtures in the second and first layers flow in different directions around the circumference, the mixing and intersecting effects are further enhanced, leading to oxygen redistribution and improved oxygen transfer efficiency. The upward-flowing air-water mixture then intersects and mixes with the first air-water mixture in the previous layer, continuing this process until it passes through all the first aerators. When the air-water mixture reaches the arc surface of the lower end of the upper frame, it forms a reflective fluid. The reflective fluid in the inner ring collides and mixes with the incident fluid in the outer ring, continuously carrying out the oxygen dissolution process in both the vertical and circumferential directions. The outward-flowing air-water mixture continues to flow outwards due to inertia, further mixing with the surrounding air-water mixture and improving oxygen transfer efficiency.

[0031] As a preferred embodiment, a third aerator 7 is further provided at the ends of the horizontal pipe 4 and the vertical pipe, and the third aerator 7 is inclined upward. Preferably, the angle between the axis of the third aerator 7 and the horizontal plane is α, where α = 5~15°. The third aerator 7 is also a microporous aerator. Preferably, the orifice diameter of the third aerator is smaller than that of the second aerator.

[0032] The third aerator 7 on the longitudinal pipe sprays air upwards at an angle along the length of the aerobic tank, forming a third air-water mixture with the water above. This third air-water mixture, flowing in the same direction as the water in the tank, increases the oxygen content in the water ahead and causes the denser sludge at the bottom of the tank to move upwards, effectively diluting it and transferring oxygen. Conversely, the third air-water mixture, flowing in the opposite direction to the water in the tank, violently collides, cuts, merges, and compresses with the water, making the water droplets and bubbles smaller and denser, forming a new air-water mixture that transfers more oxygen into the water, improving dissolved oxygen efficiency. The mutual compression of the two fluids lifts the denser sludge at the bottom of the tank upwards, effectively diluting the sludge and transferring oxygen.

[0033] The third aerator 7 on the horizontal pipe sprays air upwards at an angle along the width of the aerobic tank, forming a third air-water mixture with the water above. Because the third aerator is positioned above the tank bottom, the diffused compressed air increases the spray force on the sludge at the bottom, effectively diluting the sludge, reducing the density of the wastewater, and causing it to rise further. Due to the high spray velocity and long spray path of the third aerator 7, it continuously mixes with the water above, forming a third air-water mixture. A portion of the third air-water mixture flows upwards, while another portion continues to flow towards the tank wall due to inertia. When the mixture reaches the tank wall, it forms an angle with the wall, creating a reflective air-water mixture that flows upwards and inwards. This reflective mixture collides and mixes with the upward-flowing mixture formed by the third aerator 7, continuously transferring oxygen and forming a new air-water mixture. The newly formed air-water mixture collides, cuts, and mixes with the air-water mixture formed by the first aerator 5 and the second aerator 6. It then collides, cuts, and mixes with the outward-flowing bottom layer of air-water mixture, further diluting the sludge concentration and continuously transferring oxygen. Subsequently, under the influence of the air-water mixture formed by the first aerator 5 in the second layer (two streams of air-water mixture perpendicular to each other), it collides, cuts, and mixes again, gradually moving upwards. Finally, it collides and mixes with the reflective air-water mixture formed by the curved surface at the lower end of the lower frame (two streams of air-water mixture inclined), transferring more oxygen into the water to balance the sludge activity along the height direction and improve nitrogen and phosphorus removal efficiency.

[0034] When the air-water mixture flows upward to the arc surface 11 at the lower end of the upper frame, the arc surface reflects the incident air-water mixture in a circumferential direction, that is, it reflects downward and outward with the center of the lower end surface as the center. On the one hand, the downward and outward reflected air-water mixture collides, cuts, and merges with the vertically upward air-water mixture; on the other hand, it collides, cuts, and merges with the horizontally flowing air-water mixture. Both of these processes make the water droplets and bubbles smaller and denser, further improving the oxygen transfer efficiency. This increases the aeration range. Combined with the horizontal spraying effect of the first aerator 5 and the inclined spraying effect of the third aerator 7, the width of the oxidation ditch aeration device can be effectively reduced to 0.3 to 0.5 times the width of the aerobic tank.

[0035] The working process of the oxidation ditch aeration device in the above preferred embodiment is as follows:

[0036] Based on the location of the damaged microporous aerators in the tank, select an oxidation ditch aeration device with an appropriate aeration capacity. Alternatively, based on data from dissolved oxygen meters at different locations in the tank, determine the required increase in aeration capacity and dissolved oxygen efficiency due to process adjustments, and then determine the installation location of the oxidation ditch aeration device.

[0037] The aerobic tank is not drained. Using a lifting device, the oxidation ditch aeration unit is lowered into the appropriate position within the aerobic tank and secured with ropes. The air inlet pipe of the oxidation ditch aeration unit is connected to an air source. The air source is then started, and the flow rate is controlled via a regulating valve. Compressed air enters all aerators through the pipeline.

[0038] The first aerator 5 sprays air horizontally outwards, creating a first air-water mixture by spraying air around the circumference of the riser 3 at different heights. This mixture dissolves oxygen in the water. The air-water mixture flowing in the same direction as the water in the pool enhances the oxygen content in the water ahead. The first air-water mixture flowing in the opposite direction to the water in the pool undergoes vigorous collisions, cutting, and mixing with the water, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving dissolved oxygen efficiency. The first air-water mixture flowing perpendicular to or at an obtuse angle (tilted backwards) to the water in the pool undergoes relatively vigorous collisions, cutting, and mixing with the wastewater, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving dissolved oxygen efficiency. New air-water mixtures change direction and move upwards and downwards, mixing again with the water above and below, transferring oxygen once more and improving dissolved oxygen efficiency. The first air-water mixture, flowing perpendicularly to or at an acute angle (tilted forward) to the flow direction of the water in the pool, collides, cuts, and merges with the water, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving dissolved oxygen efficiency. Because the spray directions of the first aerators 5 at different heights are different, the first air-water mixtures formed in each layer merge throughout the space, further distributing the mixtures with different oxygen contents and transferring more oxygen to the water, further improving dissolved oxygen efficiency. When the lowest first aerator 5 oxygenates the water, some of the oxygen dissolves in the water. The air that doesn't merge with the wastewater continues to move outward due to inertia, continuing to oxygenate the water in different directions; simultaneously, some air moves upward to oxygenate the water above. The air flow velocity above is greater than the air flow velocity below, and the upper air-water mixture cuts the upper air-water mixture flowing upward, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and further improving dissolved oxygen efficiency. The air, after being cut, continues to flow upwards, continuously oxygenating the water above. As the air-water mixture moves upwards to the arc surface 11 at the lower end of the upper frame, the arc surface 11 reflects the incident air-water mixture in a circumferential direction. The downward and outward reflected air-water mixture collides, cuts, and merges with the upward-flowing air-water mixture at different radii, and also collides, cuts, and merges with the horizontally flowing air-water mixture. Both of these processes make the water droplets and bubbles smaller and denser, further improving oxygen transfer efficiency and increasing the aeration range.

[0039] The second aerator 6 vertically sprays air upwards, forming a second air-water mixture with the water above. This mixture flows upwards and first intersects with the first air-water mixture formed by the first aerator 5 at the bottom layer, which flows outwards. The two air-water mixtures are perpendicular to each other in space, causing them to collide and cut violently. This process makes the water droplets and bubbles smaller and denser, transferring more oxygen into the water and forming a newer air-water mixture. As the newer air-water mixture continues to move upwards, a portion of it flows outwards. The upward-flowing air-water mixture intersects with the outward-flowing air-water mixture formed by the first aerator 5 in the second layer. The two streams of air-water mixture are perpendicular to each other in space. Furthermore, because the air-water mixture in the second layer flows in a different direction around the circumference than that in the first layer, the mixing and intersecting effects of the entire space are further enhanced, causing oxygen redistribution and further improving oxygen transfer efficiency. When the air-water mixture flows to the arc surface of the lower end of the upper frame, it forms a reflective fluid. The reflective fluid in the inner circle collides and mixes with the incident fluid in the outer circle, thus continuously carrying out the oxygen dissolution process in the vertical and circumferential directions and at different radii. Meanwhile, the outward-flowing air-water mixture continues to flow outward due to inertia, further mixing with the surrounding air-water mixture and improving oxygen transfer efficiency.

[0040] The third aerator 7 sprays air upwards at an angle along the length of the aerobic tank, forming a third air-water mixture with the water above. This third air-water mixture, flowing in the same direction as the water in the tank, increases the oxygen content in the water ahead and causes the denser sludge at the bottom of the tank to move upwards, effectively diluting it and transferring oxygen. Conversely, the third air-water mixture, flowing in the opposite direction to the water in the tank, violently collides, cuts, merges, and compresses with the water, making the water droplets and bubbles smaller and denser, forming a new air-water mixture that transfers more oxygen into the water, improving dissolved oxygen efficiency. The mutual compression of the two fluids lifts the denser sludge at the bottom of the tank upwards, effectively diluting the sludge and transferring oxygen.

[0041] The third aerator 7 sprays air upwards at an angle along the width of the aerobic tank, forming a third air-water mixture with the water above. Because the third aerator is positioned above the tank bottom, the diffused compressed air increases the spray force on the sludge at the bottom, effectively diluting the sludge, reducing the density of the wastewater, and causing it to rise further. A portion of the third air-water mixture flows upwards, while another portion continues to flow towards the tank wall due to inertia. When the third air-water mixture reaches the tank wall, it forms a reflective air-water mixture flowing upwards and inwards. This reflective air-water mixture collides and mixes with the upward-flowing third air-water mixture formed by the third aerator 7, continuously transferring oxygen and forming a new air-water mixture. This new air-water mixture collides, cuts, and merges with the air-water mixture formed by the first aerator 5 and the second aerator 6, and then collides, cuts, and mixes with the bottommost layer of first air-water mixture flowing outwards, further diluting the sludge concentration and continuously transferring oxygen. Subsequently, under the action of the first air-water mixture formed by the first aerator 5 in the second layer, the sludge collides, cuts and merges with each other again... Finally, it collides and mixes with the air-water mixture reflected on the lower arc surface of the lower frame, transferring more oxygen into the water to balance the sludge activity in the height and radius directions and improve the nitrogen and phosphorus removal effect.

[0042] When the oxygenated water-air mixture flows to the submersible jet mixer, the jet mixer mixes the fluid, causing the water-air mixture from all directions to mix again, forming a new water-air mixture and making the oxygen distribution more even.

[0043] This invention also provides a method for oxygenating oxidation ditches, using the oxidation ditch aeration device described above. The oxidation ditch oxygenation method includes the following steps:

[0044] Step 10: Without draining the aerobic tank, place the oxidation ditch aeration device into the oxygenation position within the aerobic tank, ensuring that the float 1 of the oxidation ditch aeration device floats on the liquid surface and is secured. Connect the air inlet pipe of the oxidation ditch aeration device to the air source, start the air source, and compressed air enters all aerators through the pipeline.

[0045] Step 20: The first aerator 5 on the riser sprays air outward in the circumferential direction at different heights of the riser along the horizontal direction, forming a first air-water mixture with the surrounding water that flows horizontally in all directions, dissolving the oxygen in the air into the water.

[0046] Preferably, in step 20, the first air-water mixture flowing in the same direction as the water in the pool enhances the oxygen content in the wastewater ahead; the first air-water mixture flowing in the opposite direction to the water in the pool collides and merges with the wastewater, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving dissolved oxygen efficiency; the first air-water mixture flowing in the opposite direction to the water in the pool collides and merges with the wastewater, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving dissolved oxygen efficiency; the new first air-water mixture changes direction and flows upward and downward, mixing again with the water above and below, transferring oxygen again and improving dissolved oxygen efficiency; the first air-water mixtures at different heights merge with each other throughout the space, allowing the air-water mixtures with different oxygen contents to be redistributed, transferring more oxygen to the water and further improving dissolved oxygen efficiency.

[0047] Preferably, in step 20, the first aerators 5 at different heights spray air at different speeds to oxygenate the water, forming a first air-water mixture with different dissolved oxygen levels at different heights.

[0048] Step 30: The second aerator 6 on the horizontal and vertical pipes sprays air upwards in the vertical direction, forming a second air-water mixture that flows upwards with the water above, dissolving oxygen from the air into the water.

[0049] In step 40, the upward-flowing second air-water mixture formed by the second aerator 6 and the horizontally flowing first air-water mixture formed by the first aerator 5 collide and merge with each other, continuously transferring oxygen.

[0050] Preferably, in step 40, during the upward flow of the second carbonated water mixture, it first perpendicularly cuts with the first carbonated water mixture flowing outwards from the bottommost first aerator 5, making the water droplets and bubbles smaller and denser, transferring more oxygen into the water, forming a new carbonated water mixture; a portion of the new carbonated water mixture continues to flow upwards, while another portion flows outwards; the upward-flowing new carbonated water mixture perpendicularly cuts with the first carbonated water mixture flowing outwards from the second layer's first aerator 5, transferring more oxygen into the water, forming a newer carbonated water mixture; a portion of the newer carbonated water mixture continues to flow upwards, while another portion flows outwards; the upward-flowing newer carbonated water mixture perpendicularly cuts with the first carbonated water mixture flowing outwards from the upper first aerator 5, transferring more oxygen into the water, forming a newer carbonated water mixture; and so on, until it passes through all the first aerators, enhancing the mixing and cutting effect of the entire space, redistributing oxygen, and further improving the oxygen transfer efficiency.

[0051] Preferably, the method in this embodiment further includes:

[0052] In step 50, the third aerator 7 on the longitudinal pipe sprays air upwards at an angle along the length of the aerobic tank, forming a third air-water mixture with the water above. The third air-water mixture flowing in the same direction as the water in the tank increases the oxygen content in the water ahead. The third air-water mixture flowing in the opposite direction to the water in the tank collides, merges, and compresses with the water, making the water droplets and bubbles smaller and denser, forming a new air-water mixture that transfers more oxygen to the water, improving dissolved oxygen efficiency.

[0053] The third aerator 7 on the horizontal pipe sprays air upwards at an angle along the width of the aerobic tank, forming a third air-water mixture with the water body above it. Part of the third air-water mixture flows upwards, while another part continues to flow towards the tank wall due to inertia. When the third air-water mixture reaches the tank wall, it forms a reflected air-water mixture that flows upwards and inwards under the reflection of the tank wall. This mixture collides and merges with the upward-flowing third air-water mixture formed by the third aerator 7, the second air-water mixture formed by the second aerator 6, and the first air-water mixture formed by the first aerator 5, continuously transferring oxygen.

[0054] Preferably, the method in this embodiment further includes:

[0055] In step 60, when the upward-flowing soda-water mixture reaches the lower end face of the upper frame, the arc surface 11 reflects the soda-water mixture downward and outward with the center of the lower end face as the center. The downward and outward reflected soda-water mixture collides and merges with the upward-flowing soda-water mixture, and also collides and merges with the soda-water mixture flowing in all directions, making the water droplets and bubbles smaller and denser, further improving the oxygen transfer efficiency.

[0056] When upgrading an aerobic tank, it is not necessary to discharge wastewater containing activated sludge from the aerobic tank. The oxidation ditch aeration device is floated in the aerobic tank, allowing the air-water mixture generated by aerators at different directions, angles, and heights to cut and mix with each other. This results in smaller, denser water droplets and bubbles, dissolving more oxygen in the water and achieving a spatial oxygenation process, thus realizing the nitrogen and phosphorus removal effects of the upgrade.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the specific embodiments described above. The specific embodiments and descriptions in the specification are merely for further illustrating the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. An oxidation ditch aeration device, characterized in that, The system includes a float (1), a support (2), and an aeration assembly. The support (2) is mounted on the float (1), and the aeration assembly is mounted on the support (2). The aeration assembly includes a vertical pipe (3), a horizontal pipe (4), and a longitudinal pipe that are interconnected. The horizontal pipe and the longitudinal pipe are horizontally and perpendicularly arranged at the lower part of the support (2), and the vertical pipe is vertically arranged on the central axis of the support. The top of the vertical pipe is connected to the air inlet pipe. Several horizontal aeration groups are spaced apart along the height direction on the vertical pipe (3). Each horizontal aeration group includes several first aerators (5) evenly arranged along the circumference of the vertical pipe. The first aerators (5) are horizontally arranged. All the first aerators of the horizontal aeration groups are arranged horizontally. The aerators are staggered in the circumferential direction, and all the first aerators do not overlap in the horizontal projection; the horizontal pipe (4) is arranged along the width of the aerobic tank, and the vertical pipe is arranged along the length of the aerobic tank; a second aerator (6) is provided on both the horizontal pipe and the vertical pipe, and the second aerator (6) is set vertically; in two adjacent horizontal aeration groups, the orifice diameter of the first aerator in the lower horizontal aeration group is larger than the orifice diameter of the first aerator in the upper horizontal aeration group; a third aerator (7) is also provided at the end of the horizontal pipe and the vertical pipe, and the third aerator (7) is set inclined upward; the orifice diameter of the third aerator is smaller than the orifice diameter of the second aerator; The oxidation ditch aeration device is installed in the aerobic tank without draining water.

2. The oxidation ditch aeration device according to claim 1, characterized in that, The support (2) includes an upper frame and a lower frame, with the lower frame located below the upper frame; the upper frame is located on the float, and the lower end of the upper frame is below the liquid surface; the lower end surface of the upper frame is an upwardly convex arc surface.

3. A method for oxygenating an oxidation ditch, characterized in that, The oxidation ditch aeration device according to claim 1 or 2 is used; the oxygenation method includes the following steps: Step 10: Do not drain the aerobic tank. Place the oxidation ditch aeration device in the aerobic tank at the oxygenation position. The float (1) of the oxidation ditch aeration device floats on the liquid surface and is fixed. Connect the air inlet pipe of the oxidation ditch aeration device to the air source, start the air source, and compressed air enters all aerators through the pipeline. Step 20: The first aerator (5) on the riser sprays air outward in the circumferential direction at different heights of the riser along the horizontal direction, forming a first air-water mixture with the surrounding water and flowing horizontally in all directions, dissolving the oxygen in the air into the water. Step 30: The second aerator (6) on the horizontal and vertical pipes sprays air upward in the vertical direction, forming a second air-water mixture with the water above, which flows upward and dissolves the oxygen in the air into the water. Step 40: The second air-water mixture formed by the second aerator (6) flowing upward and the first air-water mixture formed by the first aerator (5) flowing horizontally in all directions collide and merge with each other, and oxygen is continuously transferred. In step 20, the first air-water mixture flowing in the same direction as the water in the pool enhances the oxygen content in the water ahead; the first air-water mixture flowing in the opposite direction to the water in the pool collides and merges with the water, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving dissolved oxygen efficiency; the first air-water mixture flowing in the opposite direction to the water in the pool collides and merges with the sewage, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, forming a new first air-water mixture; the new first air-water mixture changes direction and flows upward and downward, mixing again with the water above and below, transferring oxygen again and improving dissolved oxygen efficiency; the first air-water mixtures at different heights merge with each other throughout the space, allowing the air-water mixtures with different oxygen contents to be redistributed, transferring more oxygen to the water and further improving dissolved oxygen efficiency; In step 20, the first aerators (5) at different heights spray air at different speeds to oxygenate the water and form a first air-water mixture with different dissolved oxygen at different heights. In step 40, as the second air-water mixture flows upward, it first cuts perpendicularly with the first air-water mixture flowing outward from the bottom first aerator (5), making the water droplets and bubbles smaller and denser, transferring more oxygen into the water, and forming a new air-water mixture; part of the new air-water mixture continues to flow upward, and another part flows outward; the upward-flowing new air-water mixture cuts perpendicularly with the first air-water mixture flowing outward from the second first aerator (5), transferring more oxygen into the water, and forming a newer air-water mixture; part of the newer air-water mixture continues to flow upward, and another part flows outward; the upward-flowing newer air-water mixture cuts perpendicularly with the first air-water mixture flowing outward from the top first aerator (5), transferring more oxygen into the water, and forming a newer air-water mixture; in this way, until it passes through all the first aerators, the mixing and cutting effect of the entire space is enhanced, the oxygen is redistributed, and the oxygen transfer efficiency is improved again; Step 50: The third aerator (7) on the longitudinal pipe sprays air upwards at an angle along the length of the aerobic pool, forming a third air-water mixture with the water body above it. The third air-water mixture, which flows in the same direction as the water in the pool, enhances the oxygen content in the water body in front. The third air-water mixture, which flows in the opposite direction to the water in the pool, collides, cuts, merges and squeezes with the water body, making the water droplets and bubbles smaller and denser, forming a new air-water mixture, transferring more oxygen to the water, and improving the dissolved oxygen efficiency. The third aerator (7) on the horizontal pipe sprays air upwards at an angle along the width of the aerobic tank, forming a third air-water mixture with the water body above it. Part of the third air-water mixture flows upwards, while another part of the third air-water mixture continues to flow towards the tank wall due to inertia. When the third air-water mixture flows to the tank wall, it forms a reflected air-water mixture that flows upwards and inwards under the reflection of the tank wall. It collides and merges with the upward-flowing third air-water mixture formed by the third aerator (7), the second air-water mixture formed by the second aerator (6), and the first air-water mixture formed by the first aerator (5), continuously transferring oxygen.

4. The oxidation ditch oxygenation method according to claim 3, characterized in that, Also includes: Step 60: When the upward-flowing steam-water mixture reaches the lower end face of the upper frame, the arc surface (11) reflects the steam-water mixture downward and outward with the center of the lower end face as the center. The downward-outward reflected steam-water mixture collides and merges with the upward-flowing steam-water mixture, and also collides and merges with the steam-water mixture flowing in all directions, making the water droplets and bubbles smaller and denser, further improving the oxygen transfer efficiency.

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