Oxidation ditch oxygen supply device and non-stop upgrading and reconstruction method

Abstract

The invention relates to the technical field of sewage treatment, in particular to an oxidation ditch oxygen supply device and a non-stop upgrading reformation method.The oxidation ditch oxygen supply device comprises an aeration device, the aeration device comprises a support, an aeration assembly, an adjusting plate and a fixing plate, the fixing plate is horizontally arranged at the upper end of an aerobic tank, the adjusting plate is detachably and fixedly connected with the fixing plate, and the support is fixedly connected with the aeration assembly; the aeration assembly is arranged on a support, the lower end of the support sinks to the bottom of the aerobic tank by means of the gravity of the support, and the upper end of the support is detachably and fixedly connected with an adjusting plate. In a non-drainage state, the aeration device is arranged on the tank wall of the aerobic tank in the oxidation ditch or at a proper position of a working bridge, so that normal operation of the process is guaranteed; meanwhile, the movement direction and path of air are changed, the mutual cutting effect of steam-water mixed liquid is improved, the oxygen dissolving efficiency is improved, dissolved oxygen needed by microorganisms such as activated sludge is guaranteed, 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 in particular to an oxidation ditch oxygen supply device and a non-stop upgrading and transformation method. Background Art

[0002] Aerobic treatment in the oxidation ditch is the key to the activated sludge biological treatment process. Air is introduced into the aerobic pool, and the metabolism of aerobic microorganisms is used to remove pollutants in the wastewater to achieve the effect of nitrogen and phosphorus removal. As the country continues to strengthen its efforts in sewage treatment, the emission standards of pollutants are also constantly improving. The maximum allowable emission concentration of the basic control items of GB / T18918 is divided into three levels, two levels, one level B and one level A from high to low, and gradually achieves the emission target of one level A. For example, the emission limit of chemical oxygen demand COD emission concentration is 100mg / L for the second level, 60mg / L for the first level B, and 50mg / L for the first level A; the emission limit of ammonia nitrogen is 25mg / L for the second level, 8mg / L for the first level B, and 5mg / L for the first level A. In particular, various places have formulated more stringent local standards for sewage discharge. Figure 1 It is a schematic plan view of an aerobic pool in an oxidation ditch in the prior art. A microporous aerator is arranged at the bottom of the pool to transfer oxygen from bottom to top. A flow promoter is arranged on a working bridge in the width direction to promote the circulation of the sewage mixture.

[0003] 1. In order to achieve the corresponding emission standards, in addition to adding deep treatment processes after the existing activated sludge biological stage, the existing biological treatment processes are also modified, such as increasing the aeration volume of the aerobic tank in the oxidation ditch.

[0004] 2. When the microporous aerator holes in the oxidation ditch are blocked or the underwater aerator is damaged, it is impossible to install the aerator without drainage.

[0005] 3. When the aeration volume of the oxidation ditch needs to be increased due to process adjustments, the underwater microporous aerator cannot be installed.

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

[0007] The object of the present invention is to provide an oxidation ditch oxygen supply device and a non-stop upgrading and transformation method to solve the technical problems existing in the above-mentioned background technology; by arranging an oxygen supply device at an appropriate position of the pool wall or working bridge of the aerobic tank in the oxidation ditch, the aerator is installed without drainage; 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 guaranteed, and the denitrification and phosphorus removal effects are improved.

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

[0009] An oxidation ditch oxygen supply device comprises: an aerobic pool, a flow pusher and a dissolved oxygen meter. The aerobic pool comprises: a pool bottom, a straight wall, a guide wall, a curved wall and a working bridge. Two straight walls are symmetrically arranged in front and back, and two curved walls are symmetrically arranged in left and right. The closed wall body formed by sequentially connecting the pool bottom and the two straight walls and the two curved walls constitutes a pool body with an open top. The upper end of the pool bottom is located at the axis position of the aerobic pool and is laterally and vertically provided with a guide wall. The left and right ends of the guide wall are located at the center position of the two curved walls. The left and right ends of the guide wall are in an arc shape. The upper ends of the two straight walls, the two curved walls and the guide wall are provided with a working bridge. Two flow pushers are provided. The centers are symmetrically arranged on one side of the width direction of the working bridge to promote the circulation of the sewage mixture; the dissolved oxygen meter is arranged in the aerobic tank, and also includes: an aeration device, the aeration device can be detachably fixedly installed in the aerobic tank when the aerobic tank is not drained, and the aeration device is arranged in pairs and used to replace the damaged microporous aerator at the bottom of the tank; 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 fixedly connected to the fixing plate, the aeration component is arranged on the bracket, the lower end of the bracket sinks to the bottom of the aerobic tank by its gravity, and the upper end of the bracket is detachably fixedly connected to the adjustment plate.

[0010] Furthermore, the fixing plate is provided with a first fixing hole, and the fixing plate is fixed to the upper end of the aerobic tank by an anchor bolt through the first fixing hole; the adjustment plate is composed of two mutually perpendicular plates, wherein the horizontal plate is provided with a second adjustment hole, the second adjustment hole is adapted to the first fixing hole on the fixing plate, and the vertical plate is provided with a second fixing hole for fixing the bracket.

[0011] Furthermore, 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 the upper side of the guide rod, the connecting plate is adapted to the adjustment plate on the pool wall, the base is a channel steel and the channel steel groove is downwardly in contact with the bottom of the pool, the connecting plate is vertically arranged, and a first adjustment hole is opened on the connecting plate, the first adjustment hole is an elongated waist hole and is vertically arranged, and the first adjustment hole is adapted to the second fixing hole on the adjustment plate.

[0012] Furthermore, the guide rods are steel pipes and there are two of them. The length of the guide rods is adapted to the depth of the aerobic pool, and the two guide rods are spaced apart.

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

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

[0015] Furthermore, a plurality of aerators are provided, and the plurality of aerators are arranged in a horizontally and vertically staggered manner, wherein the center height of the aerators in the uppermost row is less than half the height of the liquid surface.

[0016] Furthermore, the aerator is a convex disc type microporous aerator; the aerator hole diameter has two specifications, the hole diameter of the upper aerator is smaller than the hole diameter of the lower aerator, the upper aerator is the second aerator, the lower aerator is the first aerator, the air speed of the first aerator is smaller than the air speed of the second aerator; when the number of rows of aerators is an even number, the number of rows of aerators of the two specifications is equal; when the number of rows of aerators is an odd number, the number of rows of the second aerator is one row less than the number of rows of the first aerator.

[0017] A method for upgrading and transforming an oxidation ditch without stopping operation, using an oxidation ditch oxygen supply device, specifically comprising the following steps:

[0018] Step 1: According to the location of the damaged microporous aerator in the pool, select an aeration device with a suitable aeration volume and determine the installation location of the aeration device; or according to the data detected by the dissolved oxygen meter at different locations in the aerobic 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 aeration device;

[0019] Step 2: Use anchor bolts to assemble the fixing plate on the top of the aerobic pool at the determined installation position;

[0020] Step 3: Use fasteners to assemble the adjustment plate on the fixed plate and make it slide left and right;

[0021] Step 4: Use a lifting device to slowly drop the bracket along the aerobic tank wall or the working bridge to the bottom of the tank. Under the action of its own gravity, the two sides of the channel steel of the base squeeze the sludge and stick it tightly to the bottom of the tank; according to the position of the connecting plate, slide the left and right positions of the adjusting plate, fix the connecting plate with fasteners through the first adjusting hole and the second fixing hole on the adjusting plate, and then fasten the adjusting plate to the fixing plate;

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

[0023] Step 6: The upper end of the aeration main pipe is connected to the air source with a hose, and the flow is controlled by 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 present invention has the following beneficial effects:

[0026] The oxidation ditch oxygen supply device and the non-stop upgrading and reconstruction method provided by the present invention ensure the normal operation of the process by arranging the oxygen supply device at the appropriate position of the pool wall or the working bridge of the oxidation ditch without drainage; at the same time, the movement direction and path of the air are changed, the mutual cutting effect of the steam-water mixture is increased, the dissolved oxygen efficiency is enhanced, the dissolved oxygen required by microorganisms such as activated sludge is guaranteed, and the denitrification and phosphorus removal effects are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the plane structure of the aerobic pool in the existing oxidation ditch;

[0028] Figure 2 It is a schematic diagram of the plan layout of the oxygen supply device according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of a vertical installation of an oxygen supply device according to an embodiment of the present invention;

[0030] Figure 4 is a schematic diagram of a bracket according to an embodiment of the present invention;

[0031] Figure 5 yes Figure 4 Left view of the second adjustment hole in the middle;

[0032] Figure 6 It is a schematic structural diagram of an oxygen supply device according to an embodiment of the present invention;

[0033] Figure 7 is a schematic diagram of the structure of an adjustment plate according to an embodiment of the present invention;

[0034] Figure 8 yes Figure 7 A top view of the second adjustment hole;

[0035] Fig. 9 This is a schematic diagram of aerator distribution.

[0036] The numbers in the accompanying 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 adjusting hole, 22-aeration assembly, 221-body, 222-aeration pipe, 223-aerator, 2231-first aerator, 2232-second aerator, 224-sleeve, 23-adjusting plate, 231-second adjusting hole, 232-second fixing hole, 24-fixing plate, 3-flow pusher, 4-dissolved oxygen meter. DETAILED DESCRIPTION

[0037] Aerobic pool process in prior art oxidation ditch Figure 1 If the microporous aerator in the aerobic pool is clogged or the underwater aerator is damaged, the aeration volume in the pool will be significantly reduced, and the oxygen provided by the aerator cannot meet the basic needs of the activated sludge, which seriously affects the effect of nitrogen removal and phosphorus removal, and the effluent quality cannot meet the design requirements. In addition, when the aeration volume of the aerobic pool needs to be increased due to process adjustment, the existing aeration volume in the pool cannot meet the dissolved oxygen effect of the required process.

[0038] Therefore, the present invention provides an oxidation ditch oxygen supply device, such as Figures 2-3As shown, it includes: an aerobic pool 1, a flow pusher 3 and a dissolved oxygen meter 4. The aerobic pool 1 includes: a pool bottom, a straight wall 11, a guide wall 12, a curved wall 13 and a working bridge 14. Two straight walls 11 are symmetrically arranged in front and back, and two curved walls 13 are symmetrically arranged in left and right. The closed wall body formed by the pool bottom and the two straight walls 11 and the two curved walls 13 connected in sequence constitutes a pool body with an open top; the upper end of the pool bottom is located at the axis position of the aerobic pool 1, and a guide wall 12 is arranged horizontally and vertically. The left and right ends of the guide wall 12 are located at the center position of the two curved walls 13, and the left and right ends of the guide wall 12 are arc-shaped. The upper ends of the two straight walls 11, the two curved walls 13 and the guide wall 12 are provided with a working bridge 14. There are two flow pushers 3, and the centers of the two flow pushers 3 are respectively Symmetrically arranged on one side of the working bridge 14 in the width direction, it is used to promote the circulation of the sewage mixture; a certain number of dissolved oxygen meters 4 are arranged in the aerobic tank 1, and also include: an aeration device 2, the aeration device 2 can be detachably fixedly installed in the aerobic tank 1 when the aerobic tank 1 is not drained, and the aeration device 2 is arranged in pairs and is used to replace the damaged microporous aerator at the bottom of the tank; the aeration device 2 includes: a bracket 21, an aeration component 22, an adjustment plate 23 and a fixing plate 24, the fixing plate 24 is horizontally arranged at the upper end of the aerobic tank 1, the adjustment plate 23 is detachably 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 bottom of the aerobic tank 1 by its gravity, and the upper end of the bracket 21 is detachably fixedly connected to the adjustment plate 23.

[0039] like Figures 7-8 As shown, a first fixing hole is provided on the fixing plate 24, and the fixing plate 24 is fixed to the upper end of the aerobic pool 1 by an anchor bolt through the first fixing hole; the adjusting plate 23 is composed of two mutually perpendicular plates, wherein a second adjusting hole 231 is provided 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 length direction of the pool, and a second fixing hole 232 for fixing the bracket 21 is provided on the vertical plate.

[0040] like Figures 4-5 As shown, the bracket 21 includes: a base 211, a guide rod 212, a connecting plate 213 and a first adjustment hole 214. The guide rod 212 is vertically arranged at the upper end of the base 211, and 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 adjustment plate 23 on the pool wall. The base 211 is a channel steel and the groove of the channel steel is downwardly in contact with the bottom of the pool to facilitate the sinking and stability of the aeration device 2; the connecting plate 213 is vertically arranged, and a first adjustment hole 214 is opened on the connecting plate 213. The first adjustment hole 214 is an elongated waist hole and is vertically arranged. The first adjustment hole 214 is adapted to the second fixing hole 232 on the adjustment 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 matches the depth of the aerobic pool 1, and the two guide rods 212 are arranged at intervals.

[0042] like Figure 6 As shown, the aeration assembly 22 includes: a body 221, an aeration pipe 222, an aerator 223 and a sleeve 224. The body 221 is vertically arranged, the aeration pipe 222 and the sleeve 224 are both arranged on the body 221, and 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 wall of the aerobic tank 1, the aerator 223 is a microporous aerator, the aerator 223 is horizontally arranged in the aerobic tank 1, and the sleeve 224 is a thin-walled The sleeve is arranged on one side of the body 221 close to the wall of the aerobic pool 1, the sleeve 224 is matched with the guide rod 212, and the 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 the base 211 on the bracket 21; when the aeration assembly 22 is working, since the base 211 and the guide rod 212 limit the degree of freedom of the aeration assembly 22, the aeration assembly 22 will not produce any direction of displacement, so as to ensure that the aeration assembly 22 works reliably.

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

[0044] like Fig. 9 As shown, according to the water level in the pool, a plurality of aerators 223 are provided, and the aerators 223 are arranged in a horizontally and vertically staggered manner, wherein the center height of the top row of aerators 223 is less than half the height of the liquid surface.

[0045] The aerator 223 is a convex disc type microporous aerator; the aerator 223 has two specifications of hole diameter, the hole diameter of the upper aerator 223 is smaller than the hole diameter of the lower aerator 223, the smaller the hole diameter of the aerator 223, the greater the speed of the injected air, and the greater the distance of the air injection; the upper aerator 223 is the second aerator 2232, and the lower aerator 223 is the first aerator 2231, and the air speed injected by the first aerator 2231 is less than the air speed injected by the second aerator 2232; when the number of rows of the aerators 223 is an even number, the number of rows of the two specifications of the aerators 223 is equal; when the number of rows of the aerators 223 is an odd number, the number of rows of the second aerator 2232 is one row less than the number of rows of the first aerator 2231.

[0046] When air with a certain pressure is introduced into the aerator 223, the compressed air is sprayed from the dense holes in the direction of the pool width, and the sewage mixture flowing forward is oxygenated at different heights at the same time, and the air spray direction is perpendicular to the sewage flow direction, thereby enhancing the dissolved oxygen effect in the height direction of the water body; the following problems in the prior art are overcome: when the microporous aerator is installed at the bottom of the pool, when the aerator 223 sprays air upward to oxygenate the lower sewage, as the sewage flows forward, the sewage in the middle and upper parts has not been fully oxygenated, and flows forward under the action of the fluid generated by the flow promoter 3. Therefore, in the aerobic pool 1, before the oxygenated water body reaches the upstream submersible flow promoter 3, that is, between the two flow promoters 3 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.

[0047] The air in the aerators 223 at different depths oxygenates the sewage at different speeds to form a soda-water mixture with different dissolved oxygen efficiencies. The hole diameter of the first aerator 2231 installed at the lower part of the pool wall is larger than the hole diameter of the second aerator 2232 above. The air speed of the first aerator 2231 is relatively low. When oxygenating 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 in the width direction due to inertia, and continues to oxygenate the water body in the width direction; on the other hand, due to the low density of the air, part of the air moves upward to oxygenate the water body above. On different longitudinal sections parallel to the pool wall, 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 sewage, and further improving the oxygen dissolution efficiency, thereby once again improving the oxygen dissolution effect in the height direction. The air after cutting continues to move upward to continuously oxygenate the sewage above.

[0048] The aerator 223 is a convex disc structure. The spray range of each aerator 223 is radially sprayed toward the pool width with the axis of the aerator disc as the center. The spray direction toward the pool width is used as the main movement direction of aeration, and the sewage in the pool is oxygenated in the width direction; at the same time, the spray is slightly upward / downward and forward / backward. The spray direction slightly upward / downward and forward / backward is used as the secondary movement direction of aeration, and the sewage in the pool is oxygenated in the height and length directions. Since the aerator 223 is staggered in the length and height directions of the pool wall, during the aeration process in the width direction, the air-water mixture formed by the air sprayed by the aerator 223 at different positions is cut and mixed with each other in the length and height directions at the same time, and a three-dimensional aeration process is carried out with the width direction as the main direction and the height and length directions as the auxiliary directions, so that the water droplets and bubbles become smaller and finer, and more oxygen is transferred to the water.

[0049] The air in the two aeration devices 2 arranged in pairs at the relative positions of the straight wall 11 and the working bridge 14 of the aerobic pool 1 is ejected from the aeration disk at a high speed far greater than the flow speed of water. The opposite aerator 223 simultaneously aerates and dissolves the sewage in the front (pool width) (since the flow speed of air is far greater than the flow speed of sewage, in order to simplify the description of the mixing and cutting process, the role of the jetted air is taken as the main process). When the gas-water mixture after continuous oxygen dissolution quickly moves to the middle of the pool width, the two gas-water mixtures collide and cut with each other, making the water droplets and bubbles smaller and denser, and transferring more oxygen to the water; the gas-water mixture after mutual collision and mixing changes the direction of movement to move upward and downward. Among them, the gas-water mixture moving downward constantly collides with the gas-water mixture below again, once again making the water droplets and bubbles smaller and denser, and improving the oxygen transfer efficiency. And prevent the 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 flow propeller) flows forward, it continuously cuts and collides with the steam-water mixture formed by the front aerator 223 at different heights, so that the water droplets and bubbles are continuously cut in the length direction, and the oxygen transfer process is continuously carried out, thereby further improving the oxygen transfer efficiency.

[0050] The upward-moving soda-water mixture constantly collides with the soda-water mixture above, making the water droplets and bubbles smaller and denser, thus improving the oxygen transfer efficiency. Since the air density is relatively low, the unintegrated air moves upward and constantly mixes with the soda-water mixture above, thus enhancing the dissolved oxygen efficiency above and balancing 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 flow propeller) flows forward, it constantly cuts and collides with the soda-water mixture formed by the front aerator in different height directions, so that the water droplets and bubbles are constantly cut in the length direction, so that the water droplets and bubbles are repeatedly cut, and the oxygen transfer process is continuously carried out, further improving the oxygen transfer efficiency.

[0051] When the gas-water mixture that has been continuously dissolved with oxygen flows to the submersible flow-making device 3 in front, the submersible flow-making device mixes the fluid, so that the gas-water mixture in each direction is mixed again to form a new gas-water mixture so that the distribution of oxygen is more balanced.

[0052] Two aeration devices 2 are mirror-set at the relative position of the curved wall 13 with the axis of the aerobic tank 1 as the axis of symmetry. Compared with the two aeration devices 2 set in pairs at the relative position of the straight wall 11 and the working bridge 14 of the aerobic tank 1, the two aeration devices 2 are identical in structure except that the adjustment plate 23 and the connecting plate 213 are adapted to the arc structure. During aeration, air is ejected from each aeration disk at a high speed far greater than the flow speed of water toward the center of the curved path, and the aerators 223 set in pairs in mirror-set form simultaneously aerate and dissolve oxygen in the sewage in front of the center of the curved path. When the gas-water mixture after continuous oxygen dissolution quickly moves to the center of the bend (the end of the guide wall 12), multiple streams of gas-water mixture 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 gas-water mixture changes direction and moves in all directions, further cutting and exchanging with the surrounding water body, so that more is dissolved in the water, realizing a new oxygen dissolution process in the entire space to balance the sludge activity in the space. Then it flows forward with the fluid flowing along the bend direction (the fluid flowing forward generated by the submersible flow propeller), and continuously cuts and collides with the gas-water mixture formed by the front aerator 223 again, so that the 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 the oxidation ditch is upgraded, 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 the curved wall 13, so that the steam-water mixture produced by the relative aerators 223 can be cut and mixed with each other, making the water droplets and bubbles smaller and denser, dissolving more oxygen in the water, so as to achieve the deammonification and phosphorus removal effect of the upgraded transformation.

[0054] A non-stop upgrading and transformation method specifically comprises 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 amount 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 pool 1, determine the aeration amount and dissolved oxygen efficiency that need to be increased due to process adjustment, and determine the installation position of the aeration device 2;

[0056] 2. Use anchor bolts to assemble the fixing plate 24 on the top of the aerobic pool 1 at the determined installation position;

[0057] 3. Use fasteners to assemble the adjustment plate 23 on the fixed plate 24, and make it slide left and right;

[0058] 4. Use a lifting device to slowly drop 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 stick it tightly to the bottom of the tank. According to the position of the connecting plate 213, the left and right positions of the sliding adjustment plate 23 are adjusted. The connecting plate 213 is fixed with fasteners through the first adjustment 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 lifting device to insert the two sleeves 224 on the aeration assembly 22 into the two guide rods 212 on the bracket 21, and slowly drop the aeration assembly 22 along the guide rods 212 to the base 211; since the base and the guide rods limit the degree of freedom of the aeration assembly, the aeration assembly will not produce displacement in any direction to ensure that the aeration assembly 22 works reliably.

[0060] 6. The upper end of the aeration main pipe is connected to the air source with a hose, and the flow is controlled by 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 densely distributed holes in the direction of the pool width, and the sewage flowing forward is oxygenated at different heights at the same time. The air spray direction is perpendicular to the sewage flow direction, thereby enhancing the dissolved oxygen 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 soda-water mixtures with different dissolved oxygen efficiencies. On the one hand, part of the air that has not been integrated into the sewage continues to move in the width direction due to inertia and continues to oxygenate the water in the width direction; on the other hand, due to the low density of the air, part of the air moves upward to oxygenate the water above. On different longitudinal sections parallel to the pool wall, the gas flow speed at the top is greater than the gas flow speed at the bottom, and the gas mixture at the top cuts the gas mixture moving upward below, making the water droplets and bubbles smaller and denser, transferring more oxygen to the sewage, and further improving the oxygen dissolving efficiency, thereby once again improving the dissolving effect in the height direction. The air after cutting continues to move upward and continuously oxygenates the sewage above.

[0064] The spray range of each aerator 223 is radiantly sprayed toward the width of the pool with the axis of the aeration disk as the center. During the aeration process mainly in the width direction, the steam-water mixture formed by the air sprayed by the aerators 223 at different positions performs auxiliary aeration in the length direction and the height direction at the same time, realizing a three-dimensional aeration process of mutual cutting and mixing, making the water droplets and bubbles smaller and denser, and transferring more oxygen into the water.

[0065] When the soda-water mixture that has been continuously dissolved in oxygen moves quickly to the middle of the pool width, the two opposite streams of soda-water mixture collide and cut each other, making the water droplets and bubbles smaller and denser, and transferring more to the water; the soda-water mixture that has collided and mixed with each other changes its direction of movement and moves upward and downward. Among them, the soda-water mixture moving downward continuously collides and cuts with the soda-water mixture below again, increasing the dissolved oxygen efficiency and preventing the sludge from settling at the bottom of the pool, so as to balance the sludge activity in the height direction. Under the action of the fluid generated by the submersible flow propeller, the soda-water mixture formed by the aerator in front is continuously cut and collided with each other at different heights again, and the oxygen transfer process is continuously carried out.

[0066] The upward-moving soda-water mixture continuously collides with the soda-water mixture above, making the water droplets and bubbles smaller and denser, and improving the oxygen transfer efficiency. Due to the low density of air, the unintegrated air moves upward and continuously mixes with the soda-water mixture above, enhancing the dissolved oxygen efficiency above to balance the sludge activity in the height direction. Under the action of the fluid generated by the submersible flow propeller, the soda-water mixture formed by the aerator in front is continuously cut and collided with each other at different heights, causing the water droplets and bubbles to be repeatedly cut, and the oxygen transfer process is continuously carried out.

[0067] When the gas-water mixture that has been continuously dissolved with oxygen flows to the submersible flow propeller 3 in front, the submersible flow propeller mixes the fluid, so that the gas-water mixture in each direction is mixed again to form a new gas-water mixture, so that the distribution of oxygen is more balanced.

[0068] 7.2. The compressed air in the aerator 223 arranged at the bend is sprayed from the dense holes in the direction of the pool width. The aeration devices 2 arranged in pairs in mirror image simultaneously aerate and dissolve oxygen for the sewage in front of the center of the bend. When the gas-water mixture after continuous oxygen dissolution quickly moves to the center of the bend (the end of the guide wall 12), multiple streams of gas-water mixture 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 gas-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 entire space, so as to balance the sludge activity in the space, and then flows forward with the fluid flowing along the bend, and continuously cuts and collides with the gas-water mixture formed by the aerator in front at different heights, so that the water droplets and bubbles are continuously cut in the length direction, and the oxygen transfer process is continuously carried out, thereby further improving the oxygen transfer efficiency.

[0069] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. An oxidation ditch oxygen supply device, comprising: An aerobic pool (1), a flow pusher (3) and a dissolved oxygen meter (4), wherein the aerobic pool (1) comprises: a pool bottom, a straight wall (11), a guide wall (12), a curved wall (13) and a working bridge (14), wherein two straight walls (11) are symmetrically arranged in front and back, and two curved walls (13) are symmetrically arranged in left and right, and a closed wall body formed by sequentially connecting the pool bottom and the two straight walls (11) and the two curved walls (13) constitutes a pool body with an open top; A guide wall (12) is arranged horizontally and vertically at the upper end of the pool bottom at the axial position of the aerobic pool (1), the left and right ends of the guide wall (12) are located at the center of the two curved walls (13), the left and right ends of the guide wall (12) are arc-shaped, the two straight walls (11), the two curved walls (13) and the upper ends of the guide wall (12) are provided with a working bridge (14), and the two flow pushers (3) are provided with two, and the centers of the two flow pushers (3) are symmetrically arranged respectively. One side of the working bridge (14) in the width direction is used to promote the circulation of the sewage mixture; the dissolved oxygen meter (4) is arranged in the aerobic tank (1), characterized in that it also includes: an aeration device (2), the aeration device (2) is detachably fixedly installed in the aerobic tank (1) when the aerobic tank (1) does not drain, the aeration device (2) is arranged in pairs and is used to replace the damaged microporous aerator at the bottom of the tank; the aeration device (2) includes: a bracket (21), an aeration component (22), an adjustment plate (23) and a fixing plate (24), the fixing plate (24) is horizontally arranged at the upper end of the aerobic tank (1), the adjustment plate (23) is detachably 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 bottom of the aerobic tank (1) by its gravity, and the upper end of the bracket (21) is detachably fixedly connected to the adjustment plate (23).

2. An oxidation ditch oxygen supply device according to claim 1, characterized in that: 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) by an anchor bolt through the first fixing hole; the adjusting plate (23) is composed of two mutually perpendicular plates, wherein the horizontal plate is provided with a second adjusting hole (231), the second adjusting hole (231) being matched with the first fixing hole on the fixing plate (24), and the vertical plate is provided with a second fixing hole (232) for fixing the bracket (21).

3. An oxidation ditch oxygen supply device according to claim 2, characterized in that: The support (21) comprises: a base (211), a guide rod (212), a connecting plate (213) and a first adjustment 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 matched with the adjustment plate (23) on the pool wall; the base (211) is a channel steel and the groove of the channel steel is downwardly in contact with the pool bottom; the connecting plate (213) is vertically arranged; the connecting plate (213) is provided with a first adjustment hole (214); the first adjustment hole (214) is an elongated waist hole and is vertically arranged; the first adjustment hole (214) is matched with the second fixing hole (232) on the adjustment plate.

4. An oxidation ditch oxygen supply device according to claim 3, characterized in that: 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 pool (1). The two guide rods (212) are arranged at intervals.

5. An oxidation ditch oxygen supply device according to claim 4, characterized in that: The aeration assembly (22) comprises: a body (221), an aeration pipe (222), an aerator (223) and a sliding sleeve (224); the body (221) is arranged vertically, the aeration pipe (222) and the sliding sleeve (224) are both arranged on the body (221), and the aerator (223) is horizontally installed on the aeration pipe (222); the aeration pipe (222) is arranged on a side of the body (221) away from the wall of the aerobic tank (1), and the aerator (223) is arranged on a side of the body (221) away from the wall of the aerobic tank (1). (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 a side of the 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 body (221) is in close contact with the upper surface of the base (211) on the bracket (21).

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

7. An oxidation ditch oxygen supply device according to claim 6, characterized in that: A plurality of aerators (223) are provided, and the plurality of aerators (223) are arranged in a horizontally and vertically staggered manner, wherein the center height of the aerators (223) in the uppermost row is less than half the height of the liquid surface.

8. An oxidation ditch oxygen supply device according to claim 7, characterized in that: The aerator (223) is a convex disc type microporous aerator; the aerator (223) has two specifications of hole diameter, the hole diameter of the upper aerator (223) is smaller than the hole diameter 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 speed sprayed by the first aerator (2231) is smaller than the air speed sprayed by the second aerator (2232); when the number of rows of the aerators (223) is an even number, the number of rows of the two specifications of the aerators (223) is equal; when the number of rows of the aerators (223) is an odd number, the number of rows of the second aerator (2232) is one row less than the number of rows of the first aerator (2231).

9. A method for upgrading and renovating an oxidation ditch without stopping operation, using the oxidation ditch oxygen supply device according to any one of claims 1 to 8, characterized in that: The specific steps include: Step 1: According to the position of the damaged microporous aerator in the pool, an aeration device (2) with a suitable aeration amount is selected, and the installation position of the aeration device (2) is determined; or according to the data detected by the dissolved oxygen meter (4) at different positions in the aerobic pool (1), the aeration amount and dissolved oxygen efficiency that need to be increased due to process adjustment are determined, and the installation position of the aeration device (2) is determined; Step 2: assemble the fixing plate (24) at the top of the aerobic pool (1) using anchor bolts at the determined installation position; Step 3: Use fasteners to assemble the adjustment plate (23) on the fixed plate (24) and make it slide left and right; Step 4: Use a lifting device to slowly drop the support (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), the left and right positions of the sliding adjustment plate (23) are adjusted. The connecting plate (213) is fixed by fasteners through the first adjustment hole (214) and the second fixing hole (232) on the adjustment plate (23), and then the adjustment plate (23) is fastened to the fixing plate (24); Step 5: Use a lifting device to insert the two sliding sleeves (224) on the aeration assembly (22) into the two guide rods (212) on the bracket (21), and slowly lower the aeration assembly (22) along the guide rods (212) onto the base (211); Step 6: The upper end of the aeration main pipe is connected to the air source with a hose, and the flow is controlled by a regulating valve; Step 7: Open the air source regulating valve, and air with a certain pressure enters each aerator (223).

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