An oxidation ditch oxygen supply device and a method for upgrading and transformation without shutdown

Abstract

The present invention relates to the technical field of sewage treatment, and particularly to an oxidation ditch oxygen supply device and a method for upgrading and transforming without stopping operation, including: an aeration device, the aeration device includes: a bracket, an aeration assembly, an adjustment plate and a fixing plate, the fixing plate is horizontally arranged at the upper end of the aerobic tank, the adjustment plate is detachably and fixedly connected to the fixing plate, the aeration assembly is arranged on the bracket, the lower end of the bracket sinks to the bottom of the aerobic tank by its own gravity, and the upper end of the bracket is detachably and fixedly connected to the adjustment plate. In the present invention, without draining water, by arranging the aeration device at an appropriate position on the wall of the aerobic tank or the working bridge in the oxidation ditch, the normal operation of the process is ensured; at the same time, the movement direction and path of air are changed, the mutual cutting effect of the steam-water mixture is increased, the oxygen dissolution efficiency is enhanced, the dissolved oxygen required by microorganisms such as activated sludge is ensured, and the nitrogen and phosphorus removal effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to an oxidation ditch oxygen supply device and a non-stop operation upgrade and transformation method. Background Art

[0002] Aerobic treatment in an oxidation ditch is the key to the activated sludge biological treatment process. Air is introduced into the aerobic tank, and aerobic microorganisms are used to remove pollutants in the wastewater through metabolic actions to achieve the effect of nitrogen and phosphorus removal. With the continuous strengthening of the country's efforts in sewage treatment, the discharge standards for pollutants have also been continuously improved. The maximum allowable discharge concentrations of the basic control items in GB / T 18918 are divided into three levels, level two, level one B, and level one A from high to low, gradually achieving the discharge target of level one A. For example, the secondary discharge limit of the chemical oxygen demand (COD) discharge concentration is 100 mg / L, level one B is 60 mg / L, and level one A is 50 mg / L; the ammonia nitrogen discharge limit for level two is 25 mg / L, level one B is 8 mg / L, and level one A is 5 mg / L. In particular, local standards for more stringent sewage discharge have been formulated in various places. Figure 1 FIG. is a schematic plan view of an aerobic tank in an oxidation ditch in the prior art. The microporous aerator is arranged at the bottom of the tank, and the oxygen transfer process is carried out from bottom to top. The impeller is arranged on the working bridge in the width direction to promote the circulating flow of the sewage mixture.

[0003] 1. To achieve the corresponding discharge standards, in addition to adding a deep treatment process behind the existing activated sludge biological section, the existing biological treatment process also needs to be transformed, such as increasing the aeration volume of the aerobic tank in the oxidation ditch.

[0004] 2. When the orifices of the microporous aerators in the oxidation ditch are blocked or the underwater aerators are damaged, it is impossible to install the aerators without draining the water.

[0005] 3. When it is necessary to increase the aeration volume of the oxidation ditch due to process adjustment, it is also impossible to install the underwater microporous aerators.

[0006] Sewage treatment is a municipal project with a huge impact, and the activated sludge cultivation cycle is long. Therefore, it is impossible to drain the water to replace the microporous aerators. In engineering applications, a method for installing microporous aerators without draining the water is needed to meet or increase the oxygen required for the aerobic process in the oxidation ditch. Summary of the Invention

[0007] The purpose of the present invention is to provide an oxidation ditch oxygen supply device and a non-stop operation upgrade and transformation method to solve the technical problems existing in the above background art; by setting an oxygen supply device at an appropriate position on the pool wall or the working bridge of the aerobic tank in the oxidation ditch, the aerator can be installed without draining the water; at the same time, the aeration effect is effectively improved, the dissolved oxygen efficiency is increased, the dissolved oxygen required by microorganisms such as activated sludge is ensured, and the nitrogen and phosphorus removal effect is improved.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] An oxidation ditch oxygen supply device includes: an aerobic tank, a pusher, and a dissolved oxygen meter. The aerobic tank includes: a tank bottom, straight walls, a guide wall, curved walls, and a working bridge. There are two straight walls symmetrically arranged front and back, and two curved walls symmetrically arranged left and right. The tank bottom and the closed wall formed by sequentially connecting the two straight walls and the two curved walls constitute a tank body with an open top; a guide wall is horizontally and vertically arranged at the axial position of the aerobic tank at the upper end of the tank bottom. The left and right ends of the guide wall are located at the center positions of the two curved walls. The left and right ends of the guide wall are arc-shaped. A working bridge is arranged at the upper ends of the two straight walls, the two curved walls, and the guide wall. There are two pushers, and the centers of the two pushers are symmetrically arranged on one side in the width direction of the working bridge respectively to promote the circulating flow of the sewage mixture; the dissolved oxygen meter is arranged in the aerobic tank, and further includes: an aeration device. The aeration device is detachably and fixedly installed in the aerobic tank when the aerobic tank does not drain water. The aeration devices are arranged in pairs and are used to replace the damaged microporous aerators at the tank bottom; the aeration device includes: a bracket, an aeration component, an adjustment plate, and a fixing plate. The fixing plate is horizontally arranged at the upper end of the aerobic tank. The adjustment plate is detachably and fixedly connected to the fixing plate. The aeration component is arranged on the bracket. The lower end of the bracket sinks to the tank bottom of the aerobic tank by its own gravity. The upper end of the bracket is detachably and fixedly connected to the adjustment plate.

[0010] Further, the fixing plate is provided with first fixing holes, and the fixing plate is fixed to the upper end of the aerobic tank with anchor bolts through the first fixing holes; the adjustment plate is composed of two mutually perpendicular plates. Among them, a second adjustment hole is opened on the horizontal plate, and the second adjustment hole is adapted to the first fixing hole on the fixing plate. A second fixing hole for fixing the bracket is opened on the vertical plate.

[0011] Further, the bracket includes: a base, a guide rod, a connecting plate, and a first adjustment hole. The guide rod is vertically arranged at the upper end of the base. The connecting plate is arranged on one side of the upper part of the guide rod. The connecting plate is adapted to the adjustment plate on the pool wall. The base is a channel steel with the channel steel groove facing downwards and contacting the pool bottom. The connecting plate is vertically arranged. A first adjustment hole is opened on the connecting plate. The first adjustment hole is a long waist-shaped hole and is vertically arranged. The first adjustment hole is adapted to the second fixing hole on the adjustment plate.

[0012] Further, the guide rod is a steel pipe and the number is two. The length of the guide rod is adapted to the depth of the aerobic tank. The two guide rods are arranged at intervals.

[0013] Further, the aeration assembly includes: a main body, an aeration pipe, an aerator, and a sliding sleeve. The main body is vertically arranged. The aeration pipe and the sliding sleeve are both arranged on the main body, and the aerator is horizontally installed on the aeration pipe. The aeration pipe is arranged on the side of the main body away from the wall of the aerobic tank. The aerator is a microporous aerator and is horizontally arranged in the aerobic tank. The sliding sleeve is a thin-walled sleeve and is arranged on the side of the main body close to the wall of the aerobic tank. The sliding sleeve is adapted to the guide rod and can slide up and down along the guide rod. The lower end of the main body is in close contact with the upper surface of the base on the bracket.

[0014] Further, the aeration pipe includes: an aeration main pipe and aeration branch pipes. The upper end of the aeration main pipe is connected to the air source by a hose. The aeration branch pipes are arranged on the aeration main pipe. The aeration branch pipes are horizontally arranged and are used for the installation of the aerators. The number of the aerators is adapted to the number of the aeration branch pipes.

[0015] Further, a number of aerators are provided. The number of aerators is arranged in a vertical and horizontal staggered manner. Among them, the central height of the top row of aerators is less than half of the liquid level height.

[0016] Further, the aerator is a convex surface disc type microporous aerator. The pore diameters of the aerator have two specifications. The pore diameter of the upper aerator is smaller than that of the lower aerator. The upper aerator is the second aerator, and the lower aerator is the first aerator. The air velocity sprayed by the first aerator is less than the air velocity sprayed by the second aerator. When the number of rows of aerators is even, the number of rows of the two specifications of aerators is equal. When the number of rows of aerators is odd, the number of rows of the second aerator is one less than that of the first aerator.

[0017] A method for upgrading and transforming an oxidation ditch without shutdown, using the oxygen supply device of the oxidation ditch, specifically includes the following steps:

[0018] Step 1: According to the position of the damaged microporous aerator in the pool, select an aeration device with an appropriate aeration volume and determine the installation position of the aeration device; or according to the data detected by the dissolved oxygen meters at different positions in the aerobic tank, determine the increased aeration volume and dissolved oxygen efficiency required due to process adjustment, and determine the installation position of the aeration device.

[0019] Step 2: Assemble the fixing plate at the top of the aerobic tank with anchor bolts at the determined installation position.

[0020] Step 3: Assemble the adjusting plate on the fixing plate with fasteners and make it in a state where it can slide left and right.

[0021] Step 4: Use a lifting device to slowly lower the bracket along the aerobic tank wall or the working bridge to the bottom of the tank. Under its own gravity, the two sides of the channel steel at the base squeeze the sludge and closely adhere to the bottom of the tank; according to the position of the connecting plate, slide and adjust the left and right positions of the adjusting plate. The connecting plate is fixed with fasteners through the first adjusting hole and the second fixing hole on the adjusting plate, and then the adjusting plate is fastened to the fixing plate;

[0022] Step 5: Use a lifting device to insert the two sliding sleeves on the aeration component into the two guide rods on the bracket, and slowly lower the aeration component along the guide rods to the base;

[0023] Step 6: Connect the upper end of the main aeration pipe to the air source with a hose and control the flow rate through a regulating valve;

[0024] Step 7: Open the air source regulating valve, and air with a certain pressure enters each aerator.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] The oxidation ditch oxygen supply device and the method for upgrading without shutdown provided by the present invention ensure the normal operation of the process by setting the oxygen supply device at an appropriate position on the wall of the oxidation ditch or the working bridge in a non-draining state; at the same time, it changes the movement direction and path of the air, increases the mutual cutting effect of the steam-water mixture, enhances the oxygen dissolution efficiency, ensures the dissolved oxygen required by microorganisms such as activated sludge, and improves the nitrogen and phosphorus removal effect. Description of the Drawings

[0027] Figure 1 is a schematic plan view of the aerobic tank in the existing oxidation ditch;

[0028] Figure 2 is a schematic plan layout of the oxygen supply device in the embodiment of the present invention;

[0029] Figure 3 is a schematic vertical installation view of the oxygen supply device in the embodiment of the present invention;

[0030] Figure 4 is a schematic view of the bracket in the embodiment of the present invention;

[0031] Figure 5 is Figure 4 the left view of the second adjusting hole in

[0032] Figure 6 is a schematic structural view of the oxygen supply device in the embodiment of the present invention;

[0033] Figure 7 is a schematic structural view of the adjusting plate in the embodiment of the present invention;

[0034] Figure 8 is Figure 7 the top view of the second adjusting hole in

[0035] Figure 9 It is a schematic diagram of the aerator distribution.

[0036] The reference numerals in the drawings are: 1 - aerobic tank, 11 - straight wall, 12 - guide wall, 13 - curved wall, 14 - working bridge, 2 - aeration device, 21 - bracket, 211 - base, 212 - guide rod, 213 - connecting plate, 214 - first adjustment hole, 22 - aeration component, 221 - body, 222 - aeration pipe, 223 - aerator, 2231 - first aerator, 2232 - second aerator, 224 - sliding sleeve, 23 - adjustment plate, 231 - second adjustment hole, 232 - second fixing hole, 24 - fixing plate, 3 - agitator, 4 - dissolved oxygen meter. Specific embodiments

[0037] In the aerobic tank process of the existing oxidation ditch Figure 1 If the orifices of the microporous aerators in the aerobic tank are blocked or the underwater aerators are damaged, the aeration volume in the tank will be significantly reduced, and the oxygen provided by the aerators cannot meet the basic needs of the activated sludge, seriously affecting the effect of nitrogen and phosphorus removal and making the effluent quality fail to meet the design requirements. In addition, when the aeration volume of the aerobic tank needs to be increased due to process adjustment, the existing aeration volume in the tank cannot meet the dissolved oxygen effect required by the process.

[0038] Therefore, the present invention provides an oxidation ditch oxygen supply device, such as Figures 2 - 3As shown in the figure, it includes: an aerobic tank 1, a propeller 3, and a dissolved oxygen meter 4. The aerobic tank 1 includes: a tank bottom, straight walls 11, a diversion wall 12, curved walls 13, and a working bridge 14. There are two straight walls 11 symmetrically arranged before and after, and two curved walls 13 symmetrically arranged left and right. The tank bottom and the closed wall formed by the sequential connection of the two straight walls 11 and the two curved walls 13 constitute a tank body with an open top; a diversion wall 12 is horizontally and vertically arranged at the axis position of the upper end of the tank bottom in the aerobic tank 1. The left and right ends of the diversion wall 12 are located at the center positions of the two curved walls 13. The left and right ends of the diversion wall 12 are arc-shaped. A working bridge 14 is arranged at the upper ends of the two straight walls 11, the two curved walls 13, and the diversion wall 12. There are two propellers 3, and the centers of the two propellers 3 are symmetrically arranged on one side in the width direction of the working bridge 14 respectively to promote the circulating flow of the sewage mixture; a certain number of dissolved oxygen meters 4 are arranged in the aerobic tank 1. It also includes: an aeration device 2. The aeration device 2 is detachably and fixedly installed in the aerobic tank 1 when the aerobic tank 1 is not draining water. The aeration device 2 is arranged in pairs and is used to replace the damaged microporous aerators at the tank bottom; the aeration device 2 includes: a bracket 21, an aeration component 22, an adjusting plate 23, and a fixing plate 24. The fixing plate 24 is horizontally arranged at the upper end of the aerobic tank 1. The adjusting plate 23 is detachably and fixedly connected to the fixing plate 24. The aeration component 22 is arranged on the bracket 21. The lower end of the bracket 21 sinks to the tank bottom of the aerobic tank 1 by its own gravity, and the upper end of the bracket 21 is detachably and fixedly connected to the adjusting plate 23.

[0039] As Figures 7 - 8 shown, the fixing plate 24 is provided with a first fixing hole, and the fixing plate 24 is fixed to the upper end of the aerobic tank 1 with anchor bolts through the first fixing hole; the adjusting plate 23 is composed of two mutually perpendicular plates. Among them, a second adjusting hole 231 is opened on the horizontal plate, and the second adjusting hole 231 is adapted to the first fixing hole on the fixing plate 24 to ensure installation in the tank length direction. A second fixing hole 232 for fixing the bracket 21 is opened on the vertical plate.

[0040] As Figures 4 - 5 shown, the bracket 21 includes: a base 211, a guide rod 212, a connecting plate 213, and a first adjusting hole 214. The guide rod 212 is vertically arranged at the upper end of the base 211. The connecting plate 213 is arranged on one side of the upper part of the guide rod 212. The connecting plate 213 is adapted to the adjusting plate 23 on the pool wall. The base 211 is a channel steel with the channel steel groove facing downwards and contacting the pool bottom to facilitate the sinking and stability of the aeration device 2; the connecting plate 213 is vertically arranged, and a first adjusting hole 214 is opened on the connecting plate 213. The first adjusting hole 214 is a long waist-shaped hole and is vertically arranged. The first adjusting hole 214 is adapted to the second fixing hole 232 on the adjusting plate to ensure installation in the depth direction.

[0041] The guide rods 212 are steel pipes and there are two of them. The length of the guide rods 212 is adapted to the depth of the aerobic tank 1, and the two guide rods 212 are arranged at intervals.

[0042] As Figure 6 shown, the aeration assembly 22 includes: a main body 221, an aeration pipe 222, an aerator 223 and a sliding sleeve 224. The main body 221 is arranged vertically. The aeration pipe 222 and the sliding sleeve 224 are both arranged on the main body 221. The aerator 223 is horizontally installed on the aeration pipe 222. The aeration pipe 222 is arranged on the side of the main body 221 away from the wall of the aerobic tank 1. The aerator 223 is a microporous aerator. The aerator 223 is horizontally arranged in the aerobic tank 1. The sliding sleeve 224 is a thin-walled sleeve and is arranged on the side of the main body 221 close to the wall of the aerobic tank 1. The sliding sleeve 224 is adapted to the guide rod 212, and the sliding sleeve 224 can slide up and down along the guide rod 212. The lower end of the main body 221 is in close contact with the upper surface of the base 211 on the bracket 21. When the aeration assembly 22 works, due to the base 211 and the guide rod 212 restricting the degrees of freedom of the aeration assembly 22, the aeration assembly 22 will not generate displacement in any direction to ensure the reliable operation of the aeration assembly 22.

[0043] The aeration pipe 222 includes: an aeration main pipe and aeration branch pipes. The upper end of the aeration main pipe is connected to a gas source by a hose. The aeration branch pipes are arranged on the aeration main pipe. The aeration branch pipes are horizontally arranged and are used for the installation of the aerators 223. The number of the aerators 223 is adapted to the number of the aeration branch pipes.

[0044] As Figure 9 shown, according to the water level in the tank, several aerators 223 are arranged. The several aerators 223 are arranged in a horizontal and vertical staggered manner. Among them, the central height of the top row of aerators 223 is less than half of the liquid level height.

[0045] The aerator 223 is a convex surface disc type microporous aerator. The pore diameters of the aerator 223 have two specifications. The pore diameter of the upper aerator 223 is smaller than that of the lower aerator 223. The smaller the pore diameter of the aerator 223, the greater the air injection speed and the greater the air injection distance. The upper aerator 223 is the second aerator 2232, and the lower aerator 223 is the first aerator 2231. The air injection speed of the first aerator 2231 is less than that of the second aerator 2232. When the number of rows of the aerators 223 is even, the number of rows of the two specifications of aerators 223 is equal. When the number of rows of the aerators 223 is odd, the number of rows of the second aerator 2232 is one less than that of the first aerator 2231.

[0046] When air with a certain pressure is introduced into the aerator 223, the compressed air is ejected from the dense holes in the direction of the pool width, and simultaneously oxygenates the sewage mixture flowing forward at different heights. The air ejection direction is perpendicular to the sewage flow direction, thereby strengthening the oxygen dissolution effect in the height direction of the water body; overcoming the following problems in the prior art: when the microporous aerator is installed at the bottom of the pool and the aerator 223 ejects air upward to oxygenate the lower sewage, as the sewage flows forward, the middle and upper sewage has not been fully oxygenated and flows forward under the action of the fluid generated by the propeller 3. Therefore, in the aerobic tank 1, before the oxygenated water body reaches the upstream submersible propeller 3, that is, between the two propellers 3 in the flow direction, the oxygen dissolution effect of the upper water body is lower than that of the lower water body, resulting in uneven oxygen dissolution efficiency in the height direction and affecting the nitrogen and phosphorus removal effect.

[0047] The air in the aerators 223 at different depths oxygenates the sewage at different speeds to form a steam-water mixture with different oxygen dissolution efficiencies. The hole diameter of the first aerator 2231 installed at the lower part of the pool wall is larger than that of the second aerator 2232 above. The air ejection speed of the first aerator 2231 is smaller. When oxygenating the water body, part of the oxygen is dissolved in the water. And for the part of the air that has not been incorporated into the sewage, on the one hand, it continues to move in the width direction due to inertia and oxygenates the water body in the width direction; on the other hand, due to the smaller density of the air, part of the air moves upward to oxygenate the upper water body. On different longitudinal sections parallel to the pool wall, the gas flow speed above is greater than that below. The gas mixture above cuts the gas mixture moving upward from below, making the water droplets and bubbles smaller and finer, transferring more oxygen to the sewage, and further improving the oxygen dissolution efficiency. Therefore, the oxygen dissolution effect in the height direction is improved again. The air after cutting continues to move upward and continuously oxygenates the upper sewage.

[0048] The aerator 223 has a convex disk structure. The ejection range of each aerator 223 is radial in the direction of the pool width with the axis of the aeration disk as the center. The ejection direction in the pool width is the main movement direction of aeration to oxygenate the sewage in the pool width direction; at the same time, it ejects slightly upward / downward, forward / backward. The slightly upward / downward, forward / backward ejection direction is the secondary movement direction of aeration to oxygenate the sewage in the height and length directions of the pool. Since the aerators 223 are arranged in a staggered manner in the length and height directions of the pool wall, during the aeration process in the width direction, the steam-water mixtures formed by the air ejected by the aerators 223 at different positions cut and mix with each other in the length and height directions at the same time, carrying out a three-dimensional aeration process mainly in the width direction and supplemented by the height and length directions, making the water droplets and bubbles smaller and finer, and transferring more oxygen into the water.

[0049] Two aeration devices 2 arranged in pairs at the relative positions of the straight wall 11 and the working bridge 14 of the aerobic tank 1 eject air from the aeration disc at a high speed far greater than the flow rate of water. The opposite aerators 223 simultaneously aerate and dissolve oxygen in the sewage in the front (pool width) (since the flow rate of air is far greater than the flow rate of sewage, for the sake of simplifying the description of the mixing and cutting process, the action of jetting air is taken as the main process). When the soda-water mixture after continuous oxygen dissolution quickly moves to the middle of the pool width, the two soda-water mixtures collide and cut each other, making the water droplets and bubbles smaller and finer, and transferring more oxygen into the water; the soda-water mixture after mutual collision and mixing changes its movement direction and moves upward and downward. Among them, the downward-moving soda-water mixture continuously collides with the soda-water mixture below again, once again making the water droplets and bubbles smaller and finer, improving the oxygen transfer efficiency. And it prevents sludge from settling at the bottom of the pool to balance the sludge activity in the height direction. At the same time, as the fluid flowing in the length direction (the fluid flowing forward generated by the submersible mixer) flows forward, it continuously cuts and collides with the soda-water mixture formed by the front aerator 223 at different heights again, making the water droplets and bubbles continuously cut in the length direction and continuously carrying out the oxygen transfer process, further improving the oxygen transfer efficiency.

[0050] The upward-moving soda-water mixture continuously collides with the soda-water mixture above again, once again making the water droplets and bubbles smaller and finer, improving the oxygen transfer efficiency. Since the density of air is small, the un-dissolved air moves upward and continuously mixes with the soda-water mixture above, strengthening the oxygen dissolution efficiency above to balance the sludge activity in the height direction. At the same time, as the fluid flowing in the length direction (the fluid flowing forward generated by the submersible mixer) flows forward, it continuously cuts and collides with the soda-water mixture formed by the front aerator at different height directions again, making the water droplets and bubbles continuously cut in the length direction, making the water droplets and bubbles cut repeatedly, and continuously carrying out the oxygen transfer process, further improving the oxygen transfer efficiency.

[0051] When the soda-water mixture after continuous oxygen dissolution flows to the front submersible mixer 3, the submersible mixer mixes the fluid, making the soda-water mixture in all directions mix again, forming a new soda-water mixture to make the oxygen distribution more balanced.

[0052] Two aeration devices 2 are arranged symmetrically with respect to the axis of the aerobic tank 1 at the relative position of the bend wall 13. Compared with the two aeration devices 2 arranged at the relative positions of the straight wall 11 and the working bridge 14 of the aerobic tank 1 in pairs, except that the adjusting plate 23 and the connecting plate 213 are adapted to be arc-shaped structures, other structures are the same. During aeration, air is ejected from each aeration disc at a high speed far greater than the flow rate of water towards the center of the bend. The aerators 223 arranged in mirror pairs simultaneously aerate and dissolve oxygen in the sewage in front of the center of the bend. When the steam-water mixture after continuous oxygen dissolution quickly moves to the center of the bend (the end of the guide wall 12), multiple strands of steam-water mixture act on the end of the guide wall 12 from multiple directions in the height direction. After reflection by the end of the guide wall 12, the steam-water mixture changes direction and moves in all directions, further cutting and exchanging with the surrounding water body, so that more oxygen is dissolved in the water, realizing a new oxygen dissolution process in the whole space to balance the sludge activity in the space. Then it flows forward along with the fluid flowing along the bend direction (the fluid flowing forward generated by the submersible mixer), and continuously cuts and collides with the steam-water mixture formed by the front aerator 223 again, so that water droplets and bubbles are continuously cut in the length direction, and the oxygen transfer process is continuously carried out, further improving the transfer efficiency.

[0053] When upgrading and reconstructing the oxidation ditch, it is not necessary to discharge the sewage containing activated sludge in the oxidation ditch. According to the design requirements, two aeration devices 2 are installed in pairs at the relative positions of the straight wall 11 and the working bridge 14 and at the relative positions of the bend wall 13 respectively, so that the steam-water mixtures generated by the relative aerators 223 are cut and mixed with each other, making water droplets and bubbles finer and denser, and dissolving more oxygen in the water to achieve the effect of ammonia and phosphorus removal in the upgrading and reconstruction.

[0054] A method for upgrading and reconstructing without shutdown specifically includes the following steps:

[0055] 1. According to the position of the damaged microporous aerator in the pool, select an aeration device 2 with a suitable aeration volume, and determine the installation position of the aeration device 2; or according to the data detected by the dissolved oxygen meter 4 at different positions in the aerobic tank 1, determine the increased aeration volume and dissolved oxygen efficiency required due to process adjustment, and determine the installation position of the aeration device 2;

[0056] 2. Assemble the fixing plate 24 at the top of the aerobic tank 1 with anchor bolts at the determined installation position;

[0057] 3. Assemble the adjusting plate 23 on the fixing plate 24 with fasteners and make it in a state of being able to slide left and right;

[0058] 4. Use a hoisting device to slowly lower the support 21 along the wall of the aerobic tank 1 or the working bridge 14 to the bottom of the tank. Under its own gravity, the two sides of the channel steel of the base 211 squeeze the sludge and closely adhere to the bottom of the tank; according to the position of the connecting plate 213, slide and adjust the left and right positions of the adjusting plate 23. The connecting plate 213 is fixed with fasteners through the first adjusting hole 214 and the second fixing hole 232 on the adjusting plate 23, and then the adjusting plate 23 is fastened to the fixing plate 24;

[0059] 5. Use a hoisting device to put the two sliding sleeves 224 on the aeration assembly 22 onto the two guide rods 212 on the support 21, and slowly lower the aeration assembly 22 along the guide rods 212 to the base 211; since the base and the guide rods limit the degrees of freedom of the aeration assembly, the aeration assembly will not displace in any direction, ensuring the reliable operation of the aeration assembly 22.

[0060] 6. The upper end of the main aeration pipe is connected to the air source with a hose and the flow rate is controlled through a regulating valve;

[0061] 7. Open the air source regulating valve, and air with a certain pressure enters each aerator 223.

[0062] 7.1. The compressed air in the aeration assembly 22 arranged at the straight wall is sprayed from the dense holes in the direction of the tank width, and the sewage flowing forward is oxygenated at different heights at the same time. The air spraying direction is perpendicular to the sewage flowing direction, thus strengthening the oxygen dissolution effect in the height direction of the water body.

[0063] The air in the aerators 223 at different depths oxygenates the sewage at different speeds to form a steam-water mixture with different oxygen dissolution efficiencies. A part of the air that has not been incorporated into the sewage, on the one hand, continues to move in the width direction due to inertia and oxygenates the water body in the width direction; on the other hand, due to the small density of the air, a part of the air moves upward to oxygenate the upper water body. On different longitudinal sections parallel to the tank wall, the gas flow velocity in the upper part is greater than that in the lower part. The gas mixture in the upper part cuts the gas mixture moving upward from the lower part, making the water droplets and bubbles smaller and finer, transferring more oxygen to the sewage, and further improving the oxygen dissolution efficiency, thus improving the dissolution effect in the height direction once again. The air after cutting continues to move upward and continuously oxygenates the sewage above.

[0064] The spraying range of each aerator 223 is radially sprayed in the direction of the tank width with the axis of the aeration disc as the center. During the aeration process mainly in the width direction, the steam-water mixtures formed by the air sprayed by the aerators 223 at different positions assist in aeration in the length direction and height direction at the same time, realizing a three-dimensional mutual cutting and mixing aeration process, making the water droplets and bubbles smaller and finer, and transferring more oxygen into the water.

[0065] When the aerated water mixture after continuous dissolved oxygen quickly moves to the middle of the tank width, the two opposite aerated water mixtures collide and cut each other, making the water droplets and bubbles smaller and denser, and transferring more oxygen into the water. After the collision and mixing, the aerated water mixture changes its movement direction and moves upward and downward. Among them, the downward moving aerated water mixture continuously collides and cuts with the lower aerated water mixture, increasing the dissolved oxygen efficiency and preventing sludge from depositing at the bottom of the tank to balance the sludge activity in the height direction. Under the action of the fluid generated by the submersible mixer, it continuously cuts and collides with the aerated water mixture formed by the front aerator at different heights, and continuously carries out the oxygen transfer process.

[0066] The upward moving aerated water mixture continuously collides with the upper aerated water mixture again, making the water droplets and bubbles smaller and denser again, and improving the oxygen transfer efficiency. Due to the low density of air, the un-dissolved air moves upward and continuously mixes with the upper aerated water mixture, strengthening the dissolved oxygen efficiency in the upper part to balance the sludge activity in the height direction. Under the action of the fluid generated by the submersible mixer, it continuously cuts and collides with the aerated water mixture formed by the front aerator at different heights, making the water droplets and bubbles cut repeatedly, and continuously carrying out the oxygen transfer process.

[0067] When the aerated water mixture after continuous dissolved oxygen flows to the front submersible mixer 3, the submersible mixer mixes the fluid, making the aerated water mixture in all directions mix again to form a new aerated water mixture, making the oxygen distribution more balanced.

[0068] 7.2. The compressed air in the aerator 223 arranged at the bend is sprayed from the dense holes towards the tank width direction. The mirror-image paired aeration devices 2 simultaneously carry out the aeration and dissolved oxygen process on the sewage towards the front of the bend center. When the aerated water mixture after continuous dissolved oxygen quickly moves to the center of the bend (the end of the guide wall 12), multiple aerated water mixtures act on the end of the guide wall 12 from multiple directions in the height direction. After being reflected by the end of the guide wall 12, the aerated water mixture changes its direction and moves in all directions, further cutting and exchanging with the surrounding water body, making more oxygen dissolve in the water, realizing a new dissolved oxygen process in the whole space to balance the sludge activity in the space, and then flowing forward with the fluid flowing along the bend, continuously cutting and colliding with the aerated water mixture formed by the front aerator at different heights, making the water droplets and bubbles cut continuously in the length direction, and continuously carrying out the oxygen transfer process to further improve the oxygen transfer efficiency.

[0069] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0070] The above are only the preferred embodiments of the present invention, and do not impose any formal limitations on the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, any simple modifications, equivalent replacements, and improvements made to the above embodiments shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An oxidation ditch oxygen supply device, comprising: An aerobic tank (1), a pusher (3) and a dissolved oxygen meter (4), wherein the aerobic tank (1) comprises: a tank bottom, straight walls (11), a diversion wall (12), curved walls (13) and a working bridge (14). There are two straight walls (11) symmetrically arranged front and back, and two curved walls (13) symmetrically arranged left and right. The tank bottom and the two straight walls (11) and the closed wall formed by connecting the two curved walls (13) in sequence constitute a tank body with an open top. A diversion wall (12) is horizontally and vertically arranged at the axial position of the upper end of the tank bottom in the aerobic tank (1), and the left and right ends of the diversion wall (12) are located at the center positions of the two curved walls (13). The left and right ends of the diversion wall (12) are arc-shaped. A working bridge (14) is arranged at the upper ends of the two straight walls (11), the two curved walls (13) and the diversion wall (12). There are two pushers (3), and the centers of the two pushers (3) are symmetrically arranged on one side in the width direction of the working bridge (14) respectively for promoting the circulating flow of the sewage mixture. The dissolved oxygen meter (4) is arranged in the aerobic tank (1), and it is characterized in that it further comprises: an aeration device (2). The aeration device (2) is detachably and fixedly installed in the aerobic tank (1) when the aerobic tank (1) does not drain water. Two aeration devices (2) are installed in pairs at the relative positions of the straight wall (11) and the working bridge (14) and at the relative positions of the curved wall (13). The aeration device (2) comprises: a bracket (21), an aeration assembly (22), an adjusting plate (23) and a fixing plate (24). The fixing plate (24) is horizontally arranged at the upper end of the aerobic tank (1). The adjusting plate (23) is detachably and fixedly connected to the fixing plate (24). The aeration assembly (22) is arranged on the bracket (21). The lower end of the bracket (21) sinks on the tank bottom of the aerobic tank (1) by its own gravity, and the upper end of the bracket (21) is detachably and fixedly connected to the adjusting plate (23). The aeration assembly (22) comprises: a body (221), an aeration pipe (222), an aerator (223) and a sliding sleeve (224). The body (221) is vertically arranged. The aeration pipe (222) and the sliding sleeve (224) are both arranged on the body (221). The aerator (223) is horizontally installed on the aeration pipe (222). The aeration pipe (222) is arranged on the side of the body (221) away from the tank wall of the aerobic tank (1). The aerator (223) is a microporous aerator, and the aerator (223) is horizontally arranged in the aerobic tank (1). The sliding sleeve (224) is a thin-walled sleeve and is arranged on the side of the body (221) close to the tank wall of the aerobic tank (1). The sliding sleeve (224) is adapted to a guide rod (212), and the sliding sleeve (224) can slide up and down along the guide rod (212). The lower end of the body (221) is in close contact with the upper surface of a base (211) on the bracket (21). The aerator (223) is a convex disk type microporous aerator; the pore diameters of the aerator (223) have two specifications, the pore diameter of the upper aerator (223) is smaller than that of the lower aerator (223), the upper aerator (223) is the second aerator (2232), the lower aerator (223) is the first aerator (2231), and the air velocity ejected by the first aerator (2231) is less than that ejected by the second aerator (2232).

2. The oxidation ditch oxygen supply device according to claim 1, characterized in that: The fixed plate (24) is provided with a first fixing hole, and the fixed plate (24) is fixed to the upper end of the aerobic tank (1) by an anchor bolt through the first fixing hole; the adjusting plate (23) is composed of two mutually perpendicular plates. Among them, a second adjusting hole (231) is opened on the horizontal plate, and the second adjusting hole (231) is adapted to the first fixing hole on the fixed plate (24), and a second fixing hole (232) for fixing the bracket (21) is opened on the vertical plate.

3. The oxygen supply device for oxidation ditch according to claim 2, wherein: The bracket (21) includes: a base (211), a guide rod (212), a connecting plate (213), and a first adjusting hole (214). The guide rod (212) is vertically arranged at the upper end of the base (211), the connecting plate (213) is arranged on one side of the upper part of the guide rod (212), the connecting plate (213) is adapted to the adjusting plate (23) on the pool wall, the base (211) is a channel steel and the channel steel groove faces downward and contacts the pool bottom, the connecting plate (213) is vertically arranged, a first adjusting hole (214) is opened on the connecting plate (213), the first adjusting hole (214) is a long oblong hole and is vertically arranged, and the first adjusting hole (214) is adapted to the second fixing hole (232) on the adjusting plate.

4. The oxidation ditch oxygen supply device according to claim 3, characterized in that: The guide rod (212) is a steel pipe and the number is two. The length of the guide rod (212) is adapted to the depth of the aerobic tank (1), and the two guide rods (212) are arranged at intervals.

5. The oxygen supply device for oxidation ditch according to claim 4, characterized in that: The aeration pipe (222) includes: an aeration main pipe and aeration branch pipes. The upper end of the aeration main pipe is connected to a gas source by a hose; the aeration branch pipes are arranged on the aeration main pipe, the aeration branch pipes are horizontally arranged, the aeration branch pipes are used for installing the aerator (223), and the number of the aerators (223) is adapted to the number of the aeration branch pipes.

6. The oxidation ditch oxygen supply device according to claim 5, characterized in that: A number of aerators (223) are provided, and a number of aerators (223) are arranged in a horizontal and vertical staggered manner. Among them, the central height of the top row of aerators (223) is less than half of the liquid level height.

7. The oxidation ditch oxygen supply device according to claim 6, characterized in that: When the number of rows of the aerator (223) is even, the number of rows of the two specifications of aerators (223) is equal; when the number of rows of the aerator (223) is odd, the number of rows of the second aerator (2232) is one row less than that of the first aerator (2231).

8. A method for upgrading an oxidation ditch without shutdown, using the oxidation ditch oxygen supply device described in any one of claims 1 to 7, characterized in that: Specifically, it includes the following steps: Step 1: According to the position of the damaged microporous aerator in the pool, select an aeration device (2) with a compatible aeration volume and determine the installation position of the aeration device (2); or according to the data detected by the dissolved oxygen meters (4) at different positions in the aerobic tank (1), determine the increased aeration volume and dissolved oxygen efficiency required due to process adjustment, and determine the installation position of the aeration device (2). Step 2: Assemble the fixing plate (24) at the top of the aerobic tank (1) with anchor bolts at the determined installation position. Step 3: Assemble the adjusting plate (23) on the fixing plate (24) with fasteners and make it in a state where it can slide left and right. Step 4: Use a lifting device to slowly lower the bracket (21) along the wall of the aerobic tank (1) or the working bridge (14) to the bottom of the tank. Under the action of its own gravity, the two sides of the channel steel of the base (211) squeeze the sludge and closely adhere to the bottom of the tank; according to the position of the connecting plate (213), slide the left and right positions of the adjusting plate (23). The connecting plate (213) is fixed with fasteners through the first adjusting hole (214) and the second fixing hole (232) on the adjusting plate (23), and then the adjusting plate (23) is fastened to the fixing plate (24). Step 5: Use a lifting device to put the two sliding sleeves (224) on the aeration assembly (22) onto the two guide rods (212) on the bracket (21), and slowly lower the aeration assembly (22) along the guide rods (212) to the base (211). Step 6: Connect the upper end of the main aeration pipe to the gas source with a hose and control the flow rate through a regulating valve. Step 7: Open the gas source regulating valve, and air with a certain pressure enters each aerator (223).

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