Oxidation ditch aeration device and oxygenation method

Abstract

The invention provides an oxidation ditch aeration device and an oxygenation method, the oxidation ditch aeration device comprises a buoy, a support and an aeration assembly, and the aeration assembly is installed on the buoy through the support; the aeration assembly comprises a vertical pipe, a transverse pipe and a longitudinal pipe which are communicated with one another, the transverse pipe and the longitudinal pipe are horizontally and vertically arranged at the lower part of the bracket, the vertical pipe is vertically arranged on the central axis of the bracket, and the top end of the vertical pipe is communicated with the air inlet pipe; a plurality of horizontal aeration groups are arranged on the vertical pipe at intervals in the height direction, each horizontal aeration group comprises a plurality of first aerators which are uniformly distributed in the circumferential direction of the vertical pipe, and the first aerators are horizontally arranged; second aerators are arranged on the transverse pipe and the longitudinal pipe and are vertically arranged. According to the oxidation ditch aeration device and the oxygenation method provided by the invention, installation without drainage can be carried out, and the oxygenation effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to an oxidation ditch aeration device and an oxygenation method. Background Art

[0002] Activated sludge biological treatment is the main process for sewage treatment. Aerobic treatment is to install microporous aerators at the bottom of the aerobic pool in the oxidation ditch, transfer oxygen from bottom to top, and use the metabolism of aerobic microorganisms to remove pollutants in the wastewater to achieve the effect of nitrogen removal and phosphorus removal. However, if the holes of the microporous aerator in the aerobic pool are blocked or the underwater aerator is damaged, the aerator cannot be installed without drainage. If the process adjustment requires increasing the aeration volume of the aerobic pool, the underwater microporous aerator cannot be installed. Due to the long activated sludge culture cycle, the microporous aerator cannot be drained and replaced. Therefore, an aeration device and aeration method that can be installed without drainage are needed to maintain or increase the oxygen 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 an oxygenation method, which can be installed without drainage and improve the oxygenation effect.

[0004] In order to solve the above technical problems, in a first aspect, the present invention provides an oxidation ditch aeration device, comprising a float, a bracket and an aeration assembly, wherein the bracket is arranged on the float, and the aeration assembly is arranged on the bracket; the aeration assembly comprises a vertical pipe, a horizontal pipe and a vertical pipe which are interconnected, the horizontal pipe and the vertical pipe are arranged horizontally and perpendicularly at the lower part of the bracket, the vertical pipe is arranged vertically on the central axis of the bracket, and the top of the vertical pipe is connected to the air inlet pipe; a plurality of horizontal aeration groups are arranged at intervals along the height direction on the vertical pipe, each horizontal aeration group comprises a plurality of first aerators which are evenly arranged along the circumference of the vertical pipe, and the first aerators are arranged horizontally; second aerators are arranged on both the horizontal pipe and the vertical pipe, and the second aerators are arranged vertically.

[0005] Furthermore, a third aerator is provided at the ends of the transverse tube and the longitudinal tube, and the third aerator is arranged obliquely upward.

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

[0007] Furthermore, the support includes an upper frame and a lower frame, the lower frame is arranged below the upper frame; the upper frame is arranged on the float, and the lower end of the upper frame is located below the liquid surface; the lower end surface of the upper frame is an upward convex arc surface.

[0008] In a second aspect, the present invention further provides an oxidation ditch oxygenation method, using the oxidation ditch aeration device provided in the first aspect; the oxygenation method comprises the following steps: Step 10, without draining the aerobic pool, the oxidation ditch aeration device is placed in the aerobic pool at the position to be oxygenated, and the buoy of the oxidation ditch aeration device floats on the liquid surface and is fixed; the air inlet pipe of the oxidation ditch aeration device is connected to the air source, the air source is started, and the compressed air enters all aerators through the pipeline; Step 20, the first aerator on the riser sprays air outward in the horizontal direction in the circumferential direction at different heights of the riser, forming a first steam-water mixture with the surrounding water body to flow horizontally around, dissolving oxygen in the air into the water body; Step 30, the second aerators on the horizontal pipe and the vertical pipe spray air upward in the vertical direction to form a second steam-water mixture with the water body above, which flows upward and dissolves oxygen in the air into the water body; Step 40, the second soda-water mixture formed by the second aerator and flowing upward collides and merges with the first soda-water mixture formed by the first aerator and flowing horizontally in all directions, and oxygen transfer is continuously performed.

[0009] Furthermore, in step 20, the first soda-water mixture in the same direction as the flow direction of the water body in the pool enhances the oxygen content in the water body in front; the first soda-water mixture in the opposite direction to the flow direction of the water body in the pool collides and merges with the water body, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, and improving the dissolved oxygen efficiency; the first soda-water mixture intersecting the flow direction of the water body in the pool collides and merges with the sewage, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, and forming a new first soda-water mixture; the new first soda-water mixture changes direction to flow upward and downward, and mixes again with the water bodies above and below respectively, and transfers oxygen again, thereby improving the dissolved oxygen efficiency; the first soda-water mixtures at different heights merge with each other in the entire space, so that the soda-water mixtures with different oxygen contents are distributed again, and more oxygen is transferred to the water body, further improving the dissolved oxygen efficiency.

[0010] Furthermore, in step 20, the first aerators at different heights spray air at different speeds to oxygenate the water body, thereby forming a first soda-water mixture with different dissolved oxygen contents at different heights.

[0011] Further, in the step 40, during the upward flow of the second soda-water mixture, it firstly cuts perpendicularly with the first soda-water mixture formed by the first aerator at the bottom layer and flowing in all directions, so that the water droplets and bubbles become smaller and denser, and more oxygen is transferred to the water body to form a new soda-water mixture; a part of the new soda-water mixture continues to flow upward, and the other part of the new soda-water mixture flows in all directions; the new soda-water mixture flowing upward and the first soda-water mixture formed by the first aerator at the second layer and flowing in all directions cut perpendicularly with each other, and more oxygen is transferred to the water body to form a renewed soda-water mixture; a part of the renewed soda-water mixture continues to flow upward, and the other part of the renewed soda-water mixture flows in all directions; the renewed soda-water mixture flowing upward and the first soda-water mixture formed by the first aerator at the upper layer and flowing in all directions cut perpendicularly with each other, and more oxygen is transferred to the water body to form a renewed soda-water mixture; in this way, until passing through all the first aerators, the mutual mixing and cutting effect of the entire space is enhanced, the oxygen is redistributed, and the oxygen transfer efficiency is once again improved.

[0012] Furthermore, it also includes: Step 50, the third aerator on the longitudinal pipe sprays air obliquely upward along the length direction of the aerobic tank to form a third soda-water mixture with the water body obliquely above; the third soda-water mixture in the same direction as the water body in the tank increases the oxygen content in the water body in front; the third soda-water mixture in the opposite direction to the water body in the tank collides, cuts, merges and squeezes the water body, making the water droplets and bubbles smaller and denser, forming a new soda-water mixture, transferring more oxygen to the water, and improving the dissolved oxygen efficiency; The third aerator on the horizontal pipe sprays air obliquely upward along the width direction of the aerobic pool, forming a third soda-water mixture with the water body obliquely above; a part of the third soda-water mixture flows upward, while the other part of the third soda-water mixture continues to flow toward the pool wall due to inertia. When the third soda-water mixture flows to the pool wall, the reflected soda-water mixture flows upward and inward under the reflection of the pool wall, collides and merges with the upward-flowing third soda-water mixture formed by the third aerator, the second soda-water mixture formed by the second aerator and the first soda-water mixture formed by the first aerator, and oxygen transfer is continuously performed.

[0013] Furthermore, it also includes: Step 60, when the upward-flowing soda-water mixture flows to the lower end surface of the upper frame, the arc surface reflects the soda-water mixture downward and outward with the center of the lower end surface as the center of the circle; 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.

[0014] An oxidation ditch aeration device and an oxygenation method provided by an embodiment of the present invention can install an aeration assembly on a buoy, and can be installed in an aerobic pool without drainage to ensure the normal operation of the process. At the same time, by installing a horizontally arranged first aerator at different heights of the vertical pipe, horizontal aeration is performed in all directions at different heights, and a vertically arranged second aerator is installed on the horizontal pipe and the vertical pipe to perform vertical aeration. The horizontal aeration and the vertical aeration are combined to change the moving direction and path of the gas-water mixture, enhance the mutual cutting effect of the gas-water mixture, enhance the dissolved oxygen efficiency, ensure the dissolved oxygen required by microorganisms such as activated sludge, and improve the nitrogen removal and phosphorus removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of an oxidation ditch aeration device provided in an embodiment of the present invention.

[0016] The figure includes: a buoy 1, a bracket 2, a curved surface 11, a vertical pipe 3, a horizontal pipe 4, a first aerator 5, a second aerator 6, and a third aerator 7. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings.

[0018] The embodiment of the present invention provides an oxidation ditch aeration device, such as Figure 1 As shown, it includes a float 1, a bracket 2 and an aeration assembly. The bracket 2 is arranged on the float 1, and the aeration assembly is arranged on the bracket 2. Preferably, the bracket 2 includes an upper frame and a lower frame, and the lower frame is arranged below the upper frame. The upper frame is arranged on the float 1, and the lower end of the upper frame is located below the liquid surface, and the lower end of the lower frame is located above the bottom of the pool. When the oxidation ditch aeration device moves, there is no interference between the lower end of the lower frame and the bottom of the pool and the original microporous aerator to ensure the reliable movement of the oxidation ditch aeration device. Preferably, the lower end face of the upper frame is a centrally convex arc surface 11.

[0019] The aeration assembly includes a vertical pipe 3, a horizontal pipe 4 and a vertical pipe that are interconnected. The horizontal pipe 4 and the vertical pipe are arranged horizontally and perpendicularly at the lower part of the bracket 2. The horizontal pipe 4 is arranged along the width direction of the aerobic tank, and the vertical pipe is arranged along the length direction of the aerobic tank. The vertical pipe 3 is vertically arranged on the central axis of the bracket, and the top of the vertical pipe is connected to the air inlet pipe. Several horizontal aeration groups are arranged at intervals along the height direction on the vertical pipe 3, and each horizontal aeration group includes several first aerators 5 uniformly arranged along the circumference of the vertical pipe, and the first aerator 5 is arranged horizontally. 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 first aerators do not overlap. Second aerators 6 are provided on the horizontal pipe 4 and the vertical pipe, and the second aerator 6 is arranged vertically. The first aerator 5 and the second aerator 6 are both microporous aerators.

[0020] The first aerator 5 on the riser sprays air outward in the horizontal direction in the circumferential direction of the riser 3 at different heights, forming a first soda-water mixture with the surrounding water body. The first soda-water mixture flows horizontally in all directions to dissolve oxygen in the water body. Among them: 1. The first soda-water mixture with the same flow direction as the water body in the pool increases the oxygen content in the sewage in front. 2. The soda-water mixture with the opposite flow direction of the water flow in the pool and the sewage violently collide, cut, merge and squeeze each other, making the water droplets and bubbles smaller and denser, forming a new soda-water mixture, transferring more oxygen to the water, and improving the dissolved oxygen efficiency. Then, the new soda-water mixture changes direction and moves upward and downward, mixing again with the water flow above and below, respectively, transferring oxygen again, and improving the dissolved oxygen efficiency. 3. The soda-water mixture that is perpendicular to the flow direction of the water in the pool or at an obtuse angle (inclined in the opposite direction of the water flow) collides, cuts and blends with the sewage more intensely, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving the dissolved oxygen efficiency. 4. The soda-water mixture that is at an acute angle to the flow direction of the water in the pool (inclined in the same direction of the water flow) collides, cuts and blends with the sewage, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water and improving the dissolved oxygen efficiency. 5. The spraying directions of the first aerators 5 at different heights are different, so that the soda-water mixture formed in each layer blends with each other in the entire space, so that the soda-water mixture with different oxygen contents is distributed again, transferring more oxygen to the water and further improving the dissolved oxygen efficiency. The invention overcomes the problem in the prior art that the microporous aerator is installed at the bottom of the pool, and when the aerator sprays air upward to oxygenate the lower sewage, as the sewage flows forward, the sewage in the middle and upper parts has not yet been fully oxygenated, and is driven forward by the fluid generated by the flow pusher. Therefore, in the aerobic pool, before the oxygenated water body reaches the upstream submersible flow pusher, that is, between the two flow pushers in the flow direction, the dissolved oxygen effect of the upper water body is lower than that of the lower water body, thereby making the dissolved oxygen efficiency in the height direction unbalanced, affecting the denitrification and phosphorus removal effect.

[0021] As a preferred example, in two adjacent horizontal aeration groups, the hole diameter of the first aerator of the lower horizontal aeration group is larger than the hole diameter of the first aerator of the upper horizontal aeration group. Preferably, the hole diameter of the first aerator of the lowermost horizontal aeration group is smaller than the hole diameter of the second aerator.

[0022] The speed of the first aerator of the horizontal aeration group spraying air from bottom to top gradually increases. The first aerators 5 at different heights spray air at different speeds to oxygenate the water body, forming first soda-water mixtures with different dissolved oxygen contents at different heights. The flow rate of the first soda-water mixture also gradually increases from bottom to top. When oxygenating the water body, a part of the air dissolves in the water, while the other part of the air that does not merge into the water body continues to flow around due to inertia, and continues to oxygenate the water bodies in different directions; on the other hand, due to the low density of the air, a part of the air moves upward to oxygenate the water body above. The gas flow speed above is greater than the gas flow speed below. The gas mixture above cuts the gas mixture moving upward below, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water body, and further improving the dissolved oxygen efficiency, thereby once again improving the dissolved oxygen effect in the height direction. The air after cutting continues to flow upward to continuously oxygenate the water body above.

[0023] The second aerators 6 on the horizontal and vertical tubes spray air upward in the vertical direction, forming a second soda-water mixture with the water body above, which flows upward and dissolves oxygen in the air into the water body. The second soda-water mixture flowing upward first cuts each other with the first soda-water mixture formed by the first aerator 5 at the bottom layer and flows in all directions. The two soda-water mixtures are perpendicular to each other in space, so that the two soda-water mixtures collide and cut fiercely, making the water droplets and bubbles smaller and denser, transferring more oxygen into the water, and forming a newer soda-water mixture. Since the speed of the air sprayed by the first aerator 5 is greater than the speed of the air sprayed by the second aerator 6, while the newer soda-water mixture continues to move upward, a part of the soda-water mixture flows in all directions. Among them, the soda-water mixture flowing upwards cuts each other with the first soda-water mixture flowing around formed by the first aerator 5 of the second layer, and the two streams of soda-water mixture are perpendicular to each other in space, and because the soda-water mixture of the second layer and the soda-water mixture of the first layer flow in different directions in the circumference, the mutual mixing and cutting effect of the entire space is further strengthened, so that oxygen is redistributed, and the oxygen transfer efficiency is once again improved. The soda-water mixture flowing upwards cuts and mixes with the first soda-water mixture of the upper layer, and so on, until it passes through all the first aerators. When the soda-water mixture flows to the arc surface of the lower end face of the upper frame, a reflection fluid is formed, and the reflection fluid of the inner circle and the incident fluid of the outer circle collide and mix with each other, so as to continuously carry out the oxygen dissolution process in the height direction and the circumferential direction. The soda-water mixture flowing outwards continues to flow outwards due to inertia, and further mixes with the peripheral soda-water mixture, thereby improving the oxygen transfer efficiency.

[0024] As a preferred example, a third aerator 7 is further provided at the ends of the transverse tube 4 and the longitudinal tube, and the third aerator 7 is arranged obliquely upward. Preferably, the angle between the axis of the third aerator 7 and the horizontal plane is α, α=5-15°. The third aerator 7 is also a microporous aerator. Preferably, the hole diameter of the third aerator is smaller than the hole diameter of the second aerator.

[0025] The third aerator 7 on the longitudinal pipe sprays air obliquely upward along the length direction of the aerobic tank, forming a third soda-water mixture with the water body obliquely above. The third soda-water mixture with the same flow direction as the water body in the tank increases the oxygen content in the water body in front, and makes the sludge with higher density at the bottom of the tank move upward, effectively diluting and transferring oxygen. The third soda-water mixture with the opposite flow direction of the water body in the tank collides, cuts, merges and squeezes the water body fiercely, making the water droplets and bubbles smaller and denser, forming a new soda-water mixture, transferring more oxygen to the water, and improving the dissolved oxygen efficiency. The two fluids squeeze each other to lift the sludge with higher density at the bottom of the tank upward, effectively diluting the sludge and transferring oxygen.

[0026] The third aerator 7 on the transverse tube sprays air obliquely upward along the width direction of the aerobic pool, and forms a third soda-water mixture with the water body obliquely above. Since the third aerator is arranged above the pool bottom, the scattered compressed air increases the spraying force on the pool bottom sludge, effectively dilutes the pool bottom sludge, reduces the density of sewage, and makes the sewage rise further. Since the spraying speed of the third aerator 7 is relatively large, its spraying path is also relatively long, and it continuously mixes with the water body obliquely above to form a third soda-water mixture. A part of the third soda-water mixture flows upward, and another part of the third soda-water mixture continues to flow toward the pool wall due to inertia. When the third soda-water mixture flows to the pool wall, it forms a certain angle with the pool wall, and forms a reflected soda-water mixture that flows upward and inward under the reflection of the pool wall. The reflected soda-water mixture collides and mixes with the third soda-water mixture that flows upward formed by the third aerator 7, and continuously performs the oxygen transfer process to form a new soda-water mixture. After the new soda-water mixture collides, cuts and merges with the soda-water mixture formed by the first aerator 5 and the second aerator 6, it collides, cuts and mixes with the bottom layer of soda-water mixture flowing outward, further diluting the concentration of sludge and continuously transferring oxygen. Then, under the action of the soda-water mixture formed by the first aerator 5 of the second layer (the two streams of soda-water mixture are perpendicular to each other), it collides, cuts and merges with each other again, gradually moving upwards. Finally, it collides and mixes with the reflected soda-water mixture formed by the arc surface at the lower end of the lower frame (the two streams of soda-water mixture are inclined) to transfer more oxygen into the water, so as to balance the sludge activity in the height direction and improve the nitrogen removal and phosphorus removal effect.

[0027] When the soda-water mixture flows upward to the arc surface 11 of the lower end face of the upper frame, the arc surface reflects the incident soda-water mixture in a circumferential direction, that is, it reflects downward and outward with the center of the lower end face as the center of the circle. On the one hand, the reflected soda-water mixture collides, cuts and merges with the vertically upward soda-water mixture, and on the other hand, collides, cuts and merges with the horizontally flowing soda-water mixture, both of which make the water droplets and bubbles smaller and denser, further improving the oxygen transfer efficiency. The aeration range is increased, and combined with the effects of the horizontal injection of the first aerator 5 and the oblique injection of the third aerator 7, the width of the oxidation ditch aeration device can be effectively reduced, and its width is 0.3 to 0.5 times the width of the aerobic tank.

[0028] The working process of the oxidation ditch aeration device of the above preferred embodiment is as follows: According to the location of the damaged microporous aerator in the pool, select an oxidation ditch aeration device with a suitable aeration volume. Or according to the data detected by the dissolved oxygen meter at different locations in the pool, determine the aeration volume and dissolved oxygen efficiency that need to be increased due to process adjustment, and determine the installation location of the oxidation ditch aeration device.

[0029] The aerobic pool is not drained, and the oxidation ditch aeration device is hoisted into the corresponding position in the aerobic pool with a lifting device and fixed with a rope. The air inlet pipe of the oxidation ditch aeration device is connected to the air source, the air source is started, and the flow is controlled by the regulating valve. The compressed air enters all aerators through the pipeline.

[0030] The first aerator 5 sprays outward in the horizontal direction, spraying air around the circumference of the riser 3 at different heights to form a first soda-water mixture with the surrounding water body, dissolving oxygen in the water. The soda-water mixture with the same flow direction as the water body in the pool increases the oxygen content in the water body in front. The first soda-water mixture with the opposite flow direction to the water body in the pool collides, cuts and blends with the water body fiercely, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, and improving the dissolved oxygen efficiency. The first soda-water mixture with a flow direction perpendicular to or at an obtuse angle (tilted backward) to the flow direction of the water body in the pool collides, cuts and blends with the sewage more fiercely, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, and improving the dissolved oxygen efficiency. The new soda-water mixture changes direction and moves upward and downward, mixing again with the water bodies above and below, respectively, transferring oxygen again, and improving the dissolved oxygen efficiency. The first soda-water mixture whose flow direction is perpendicular to or at an acute angle (tilted forward) to the flow direction of the water body in the pool collides, cuts and merges with the water body, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, and improving the dissolved oxygen efficiency. Since the first aerators 5 at different heights have different spraying directions, the first soda-water mixture formed in each layer merges with each other in the entire space, so that the soda-water mixture with different oxygen content is distributed again, transferring more oxygen to the water, and further improving the dissolved oxygen efficiency. When the first aerator 5 at the bottom oxygenates the water body, part of the oxygen is dissolved in the water. On the one hand, part of the air that has not been integrated into the sewage continues to move outward due to inertia, and continues to oxygenate the water bodies in different directions; on the other hand, part of the air moves upward to oxygenate the water body above. The gas flow rate above is greater than the gas flow rate below. The gas mixture above cuts the gas mixture flowing upward below, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water body, and further improving the dissolved oxygen efficiency. The air that has been cut continues to flow upward, continuously oxygenating the water above. When the soda-water mixture moves upward to the arc surface 11 on the lower end surface of the upper frame, the arc surface 11 reflects the incident soda-water mixture in a circumferential direction. The soda-water mixture reflected downward and outward collides, cuts and merges with the soda-water mixture flowing upward at different radii, and also collides, cuts and merges with the soda-water mixture flowing horizontally, both of which make the water droplets and bubbles smaller and denser, further improving the oxygen transfer efficiency and increasing the aeration range.

[0031] The second aerator 6 sprays air vertically upward to form a second soda-water mixture with the water above and flows upward, first cutting each other with the first soda-water mixture formed by the first aerator 5 at the bottom and flowing in all directions, and the two soda-water mixtures are perpendicular to each other in space, so that the two soda-water mixtures collide and cut fiercely, making the water droplets and bubbles smaller and denser, transferring more oxygen into the water, and forming a newer soda-water mixture. While the newer soda-water mixture continues to move upward, a part of the soda-water mixture flows outward. Among them, the upward-flowing soda-water mixture and the soda-water mixture formed by the first aerator 5 of the second layer flowing in all directions cut each other, and the two streams of soda-water mixture are perpendicular to each other in space, and because the soda-water mixture of the second layer and the soda-water mixture of the first layer flow in different directions in the circumference, the mutual mixing and cutting effect of the entire space is further enhanced, so that oxygen is redistributed, and the oxygen transfer efficiency is once again improved... When the soda-water mixture flows to the arc surface of the lower end face of the upper frame, a reflection fluid is formed, and the reflection fluid of the inner circle and the incident fluid of the outer circle collide and mix with each other..., thereby continuously performing the oxygen dissolution process in the height direction, the circumferential direction and different radii. The soda-water mixture flowing outward continues to flow outward due to inertia, and further mixes with the peripheral soda-water mixture, thereby improving the oxygen transfer efficiency.

[0032] The third aerator 7 sprays air obliquely upward along the length direction of the aerobic tank, forming a third soda-water mixture with the water body obliquely above. The third soda-water mixture in the same direction as the water body in the tank increases the oxygen content in the water body in front, and makes the sludge with higher density at the bottom of the tank move upward, effectively diluting and transferring oxygen. The third soda-water mixture in the opposite direction of the water body in the tank violently collides, cuts, merges and squeezes with the water body, making the water droplets and bubbles smaller and denser, forming a new soda-water mixture, transferring more oxygen to the water, and improving the dissolved oxygen efficiency. The two fluids squeeze each other to lift the sludge with higher density at the bottom of the tank upward, effectively diluting the sludge and transferring oxygen.

[0033] The third aerator 7 sprays air upward along the width direction of the aerobic pool, and forms a third soda-water mixture with the water body obliquely above. Since the third aerator is arranged above the pool bottom, the scattered compressed air increases the spraying force on the pool bottom sludge, effectively dilutes the pool bottom sludge, reduces the density of sewage, and makes the sewage rise further. A part of the third soda-water mixture flows upward, and another part of the third soda-water mixture continues to flow toward the pool wall due to inertia. When the third soda-water mixture flows to the pool wall, a reflected soda-water mixture flowing upward and inward is formed under the reflection of the pool wall. The reflected soda-water mixture collides and mixes with the third soda-water mixture flowing upward formed by the third aerator 7, and the oxygen transfer process is continuously carried out to form a new soda-water mixture. After the new soda-water mixture collides, cuts and merges with the soda-water mixture formed by the first aerator 5 and the second aerator 6, it collides, cuts and mixes with the first soda-water mixture of the lowest layer flowing around, further dilutes the concentration of sludge, and continuously transfers oxygen. Subsequently, under the action of the first soda-water mixture formed by the first aerator 5 on the second layer, they collide, cut and merge with each other again... Finally, they collide and mix with the reflected soda-water mixture on the arc surface at the lower end of the lower frame to transfer more oxygen into the water, so as to balance the sludge activity in the height and radius directions and improve the nitrogen and phosphorus removal effects.

[0034] When the gas-water mixture that has been continuously dissolved in oxygen flows to the submersible flow generator in front, the submersible flow generator mixes the fluid, so that the gas-water mixture in all directions is mixed again to form a new gas-water mixture, making the distribution of oxygen more balanced.

[0035] The present invention also provides an oxidation ditch oxygenation method, which uses the oxidation ditch aeration device of the above embodiment. The oxidation ditch oxygenation method includes the following steps: Step 10: The aerobic pool is not drained, and the oxidation ditch aeration device is placed in the aerobic pool at the position to be oxygenated, so that the buoy 1 of the oxidation ditch aeration device floats on the liquid surface and is fixed. The air inlet pipe of the oxidation ditch aeration device is connected to the air source, the air source is started, and the compressed air enters all aerators through the pipeline.

[0036] Step 20, the first aerator 5 on the riser sprays air outward in the horizontal direction in the circumferential direction at different heights of the riser, forming a first steam-water mixture with the surrounding water body to flow horizontally around, dissolving oxygen in the air in the water body.

[0037] Preferably, in step 20, the first soda-water mixture in the same direction as the flow direction of the water body in the pool enhances the oxygen content in the sewage ahead; the first soda-water mixture in the opposite direction to the flow direction of the water body in the pool collides and merges with the sewage, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, and improving the dissolved oxygen efficiency; the first soda-water mixture that intersects the flow direction of the water body in the pool collides and merges with the sewage, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, and improving the dissolved oxygen efficiency; the new first soda-water mixture changes direction to flow upward and downward, and mixes again with the water bodies above and below, respectively, and transfers oxygen again, improving the dissolved oxygen efficiency; the first soda-water mixtures at different heights merge into each other in the entire space, so that the soda-water mixtures with different oxygen contents are distributed again, transferring more oxygen to the water, and further improving the dissolved oxygen efficiency.

[0038] Preferably, in step 20, the first aerators 5 at different heights spray air at different speeds to oxygenate the water body, thereby forming a first soda-water mixture with different dissolved oxygen contents at different heights.

[0039] Step 30, the second aerators 6 on the horizontal and vertical pipes spray air upward in the vertical direction to form a second steam-water mixture with the water above, which flows upward and dissolves oxygen in the air in the water.

[0040] Step 40, the second soda-water mixture formed by the second aerator 6 and flowing upward collides and merges with the first soda-water mixture formed by the first aerator 5 and flowing horizontally in all directions, and oxygen transfer is continuously performed.

[0041] Preferably, in step 40, during the upward flow of the second soda-water mixture, it first cuts perpendicularly with the first soda-water mixture formed by the first aerator 5 at the bottom layer and flows in all directions, so that the water droplets and bubbles become smaller and denser, and more oxygen is transferred to the water to form a new soda-water mixture; a part of the new soda-water mixture continues to flow upward, and the other part of the new soda-water mixture flows in all directions; the new soda-water mixture flowing upward cuts perpendicularly with the first soda-water mixture formed by the first aerator 5 at the second layer and flows in all directions, and more oxygen is transferred to the water to form a renewed soda-water mixture; a part of the renewed soda-water mixture continues to flow upward, and the other part of the renewed soda-water mixture flows in all directions; the renewed soda-water mixture flowing upward cuts perpendicularly with the first soda-water mixture formed by the first aerator 5 at the upper layer and flows in all directions, and more oxygen is transferred to the water to form a renewed soda-water mixture; and in this way, until it passes through all the first aerators, the mutual mixing and cutting effect of the entire space is enhanced, the oxygen is redistributed, and the oxygen transfer efficiency is once again improved.

[0042] Preferably, the method of this embodiment further includes: Step 50, the third aerator 7 on the longitudinal pipe sprays air obliquely upward along the length direction of the aerobic pool to form a third soda-water mixture with the water body obliquely above. The third soda-water mixture flowing in the same direction as the water body in the pool increases the oxygen content in the water body in front. The third soda-water mixture flowing in the opposite direction to the water body in the pool collides, merges and squeezes the water body, making the water droplets and bubbles smaller and denser, forming a new soda-water mixture, transferring more oxygen to the water, and improving the dissolved oxygen efficiency.

[0043] The third aerator 7 on the transverse pipe sprays air obliquely upward along the width direction of the aerobic pool, and forms a third soda-water mixture with the water body obliquely above; a part of the third soda-water mixture flows upward, while the other part of the third soda-water mixture continues to flow toward the pool wall due to inertia. When the third soda-water mixture flows to the pool wall, the reflected soda-water mixture flows upward and inward under the reflection of the pool wall, and collides and merges with the third soda-water mixture formed by the third aerator 7, the second soda-water mixture formed by the second aerator 6, and the first soda-water mixture formed by the first aerator 5, and oxygen transfer is continuously performed.

[0044] Preferably, the method of this embodiment further includes: Step 60, when the soda-water mixture flowing upward flows to the lower end surface of the upper frame, the arc surface 11 reflects the soda-water mixture downward and outward with the center of the lower end surface as the center of the circle; the reflected soda-water mixture collides and merges with the soda-water mixture flowing upward, and also collides and merges with the soda-water mixture flowing in all directions, both of which make the water droplets and bubbles smaller and denser, further improving the oxygen transfer efficiency.

[0045] When upgrading the aerobic pool, it is not necessary to discharge the sewage containing activated sludge in the aerobic pool. The oxidation ditch aeration device is floated in the aerobic pool, so that the steam-water mixture produced by the aerators in different directions, different inclination angles and different heights can be cut and mixed with each other, making the water droplets and bubbles smaller and denser, dissolving more oxygen in the water, realizing the oxygen dissolution process in space, and achieving the denitrification and phosphorus removal effect of the upgraded transformation.

[0046] The above shows and describes 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 above specific embodiments. The above specific embodiments and the description in the specification are only for further illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the claims and their equivalents.

Claims

1. An oxidation ditch aeration device, characterized in that: The invention comprises a buoy (1), a bracket (2) and an aeration assembly, wherein the bracket (2) is arranged on the buoy (1), and the aeration assembly is arranged on the bracket (2); the aeration assembly comprises a vertical pipe (3), a horizontal pipe (4) and a vertical pipe which are interconnected, wherein the horizontal pipe and the vertical pipe are arranged horizontally and perpendicularly to each other at the lower part of the bracket (2), the vertical pipe is arranged vertically on the central axis of the bracket, and the top end of the vertical pipe is connected to the air inlet pipe; a plurality of horizontal aeration groups are arranged at intervals on the vertical pipe (3) along the height direction, each horizontal aeration group comprises a plurality of first aerators (5) uniformly arranged along the circumference of the vertical pipe, and the first aerators (5) are arranged horizontally; and second aerators (6) are arranged vertically on both the horizontal pipe and the vertical pipe.

2. The oxidation ditch aeration device according to claim 1, characterized in that: A third aerator (7) is also provided at the ends of the transverse pipe and the longitudinal pipe, and the third aerator (7) is arranged inclined upward.

3. The oxidation ditch aeration device according to claim 1, characterized in that: In two adjacent horizontal aeration groups, the hole diameter of the first aerator of the lower horizontal aeration group is larger than the hole diameter of the first aerator of the upper horizontal aeration group.

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

5. An oxidation ditch oxygenation method, characterized in that: The oxidation ditch aeration device according to any one of claims 1 to 4 is used; the oxygenation method comprises the following steps: Step 10, without draining the aerobic pool, the oxidation ditch aeration device is placed in the aerobic pool at the position to be oxygenated, and the buoy (1) of the oxidation ditch aeration device floats on the liquid surface and is fixed; and the air inlet pipe of the oxidation ditch aeration device is connected to the air source, the air source is started, and the compressed air enters all aerators through the pipeline; Step 20, the first aerator (5) on the riser sprays air outward in the horizontal direction in the circumferential direction at different heights of the riser, forming a first steam-water mixture with the surrounding water body to flow horizontally around, dissolving oxygen in the air into the water body; Step 30, the second aerators (6) on the horizontal pipe and the vertical pipe spray air upward in the vertical direction to form a second steam-water mixture with the water body above, which flows upward and dissolves oxygen in the air into the water body; Step 40, the second soda-water mixture formed by the second aerator (6) flowing upwards and the first soda-water mixture formed by the first aerator (5) flowing horizontally in all directions collide and merge with each other, and oxygen transfer is continuously performed.

6. The oxidation ditch oxygenation method according to claim 5, characterized in that: In step 20, the first soda-water mixture flowing in the same direction as the water body in the pool increases the oxygen content in the water body in front; the first soda-water mixture flowing in the opposite direction to the water body in the pool collides and merges with the water body, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, and improving the dissolved oxygen efficiency; the first soda-water mixture intersecting the water body flowing direction in the pool collides and merges with the sewage, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, and forming a new first soda-water mixture; the new first soda-water mixture changes direction and flows upward and downward, and mixes again with the water bodies above and below, respectively, and transfers oxygen again, improving the dissolved oxygen efficiency; the first soda-water mixtures at different heights merge with each other in the entire space, so that the soda-water mixtures with different oxygen contents are distributed again, and more oxygen is transferred to the water body, further improving the dissolved oxygen efficiency.

7. The oxidation ditch oxygenation method according to claim 5, characterized in that: In step 20, the first aerators (5) at different heights spray air at different speeds to oxygenate the water body, thereby forming a first soda-water mixture with different dissolved oxygen contents at different heights.

8. The oxidation ditch oxygenation method according to claim 5, characterized in that: In step 40, during the upward flow of the second soda-water mixture, it firstly cuts perpendicularly with the first soda-water mixture formed by the first aerator (5) at the bottom layer and flows in all directions, so that the water droplets and bubbles become smaller and denser, and more oxygen is transferred to the water body to form a new soda-water mixture; a part of the new soda-water mixture continues to flow upward, and the other part of the new soda-water mixture flows in all directions; the new soda-water mixture flowing upward cuts perpendicularly with the first soda-water mixture formed by the first aerator (5) at the second layer and flows in all directions, so that more oxygen is transferred to the water body to form a renewed soda-water mixture; a part of the renewed soda-water mixture continues to flow upward, and the other part of the renewed soda-water mixture flows in all directions; the renewed soda-water mixture flowing upward cuts perpendicularly with the first soda-water mixture formed by the first aerator (5) at the upper layer and flows in all directions, so that more oxygen is transferred to the water body to form a renewed soda-water mixture; and in this way, until it passes through all the first aerators, the mutual mixing and cutting effect of the entire space is enhanced, the oxygen is redistributed, and the oxygen transfer efficiency is once again improved.

9. The oxidation ditch oxygenation method according to claim 5, characterized in that: Also includes: Step 50, the third aerator (7) on the longitudinal pipe sprays air obliquely upward along the length direction of the aerobic tank to form a third soda-water mixture with the water body obliquely above; The third soda-water mixture flowing in the same direction as the water in the pool increases the oxygen content in the water ahead; the third soda-water mixture flowing in the opposite direction to the water in the pool collides, cuts, merges and squeezes the water, making the water droplets and bubbles smaller and denser, forming a new soda-water mixture, transferring more oxygen into the water, and improving the efficiency of dissolved oxygen; The third aerator (7) on the horizontal pipe sprays air obliquely upward along the width direction of the aerobic pool, and forms a third soda-water mixture with the water body obliquely above; a portion of the third soda-water mixture flows upward, while another portion of the third soda-water mixture continues to flow toward the pool wall due to inertia. When the third soda-water mixture flows to the pool wall, the reflected soda-water mixture forms an upward and inward flow under the reflection effect of the pool wall, and collides and merges with the upward-flowing third soda-water mixture formed by the third aerator (7), the second soda-water mixture formed by the second aerator (6), and the first soda-water mixture formed by the first aerator (5), thereby continuously transferring oxygen.

10. The oxidation ditch oxygenation method according to claim 5, characterized in that: Also includes: Step 60, when the soda-water mixture flowing upward flows to the lower end surface of the upper frame, the arc surface (11) reflects the soda-water mixture downward and outward with the center of the lower end surface as the center of the circle; the soda-water mixture reflected downward and outward collides and merges with the soda-water mixture flowing upward, and also collides and merges with the soda-water mixture flowing in all directions, so that the water droplets and bubbles become smaller and denser, further improving the oxygen transfer efficiency.

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