Aerobic granular sludge sewage treatment equipment and control method for enhanced denitrification and phosphorus removal

Abstract

The present invention belongs to the technical field of sewage treatment equipment, and in particular relates to an aerobic granular sludge sewage treatment equipment and control method for enhanced nitrogen and phosphorus removal. The treatment equipment includes a treatment tank, an aeration plate is provided at the bottom of the treatment tank, and an air inlet pipe is vertically connected to the center of the bottom end of the aeration plate, and the air inlet pipe is inserted through the bottom inner wall of the treatment tank. During the sewage treatment process, the present invention can shovel up the granular sludge on the inner wall of the bottom of the treatment tank through a scraper, thereby preventing the granular sludge from being deposited on the inner wall of the bottom of the treatment tank, and transport it upward under the cooperation of the auger blades and the sleeve. The granular sludge that then enters the sleeve can be moved out of the sleeve through the through hole and located in the upper half of the treatment tank, thereby promoting the circulation speed of granular sludge of different heights in the treatment tank and the efficiency of contact with air, thereby ensuring the treatment effect of the granular sludge on sewage.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment equipment, and in particular relates to an aerobic granular sludge sewage treatment equipment with enhanced denitrification and phosphorus removal and a control method. Background Art

[0002] The activated sludge process is the most widely used technology for sewage treatment. Granular sludge technology cultivates activated sludge into large-size aerobic granular sludge. During operation, the existing granular sludge sewage treatment technology is to pass the sewage and granular sludge into the treatment tank, and then introduce air into the treatment tank through the aeration plate, thereby providing an aerobic environment for the aerobic bacteria in the granular sludge. The bacteria in the granular sludge are then used to degrade organic matter, nitrogen, phosphorus and other pollutants in the sewage, so that the sewage meets the discharge standards.

[0003] However, due to the gap between the aeration plate installed at the bottom of the treatment tank and the inner wall of the bottom of the treatment tank, some granular sludge will be deposited on the inner wall of the bottom of the treatment tank during the sewage treatment process, resulting in this part of the granular sludge not being able to contact well with the air pumped in by the aeration plate, and then the granular sludge deposited on the inner wall of the bottom of the treatment tank cannot effectively degrade pollutants such as nitrogen and phosphorus in the sewage.

[0004] Therefore, it is necessary to invent an aerobic granular sludge sewage treatment equipment and control method for enhancing nitrogen and phosphorus removal to solve the above problems. Summary of the Invention

[0005] In response to the above problems, the present invention provides an aerobic granular sludge sewage treatment equipment and a control method for enhanced denitrification and phosphorus removal to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an aerobic granular sludge sewage treatment equipment with enhanced denitrification and phosphorus removal, comprising a treatment tank, an aeration plate provided at the bottom of the treatment tank, an air inlet pipe vertically connected to the center of the bottom end of the aeration plate, a plurality of inclined scrapers distributed in an annular manner on the periphery of the air inlet pipe, a plurality of scrapers fixedly connected to a fixed pipe at one end close to the air inlet pipe, and a plurality of scrapers fixedly connected to the same annular plate at one end away from the fixed pipe, a sleeve coaxial with the annular plate provided on the top of the aeration plate, a plurality of stirring assemblies distributed in an annular manner on the outer side of the sleeve, and a drive shaft vertically rotatably inserted through the center of the top of the sleeve;

[0007] The stirring assembly includes an inclined paddle plate, a third connecting rod is fixedly connected between the downward side of the paddle plate and the drive shaft, both sides of the paddle plate protrude upward, and a plurality of guide plates are evenly arranged from top to bottom on the side of the paddle plate away from the third connecting rod, the two sides of the guide plate are respectively fixedly connected to the upwardly protruding parts on both sides of the paddle plate, the upward side of the guide plate is inclined in the direction close to the paddle plate, and there is a gap between the guide plate and the side of the paddle plate away from the third connecting rod.

[0008] The top end of the driving shaft is rotatably connected to the top of the annular plate, and the top of the driving shaft is connected to the motor. The motor is driven by the driving shaft to drive the motor to drive the motor. The bottom end of the driving shaft is fixedly connected to the top of the annular plate. The top of the driving shaft is connected to the top of the annular plate. The top of the driving shaft is connected to the motor. The bottom of the driving shaft is connected to the top of the annular plate. The part of the driving shaft located in the sleeve is fixedly connected to the auger blade. The top of the sleeve is horizontally provided with a filter plate, which is fixedly connected to the side wall of the treatment tank and the filter plate is rotatably sleeved on the drive shaft. The side of the treatment tank is connected to the water inlet pipe and the drain pipe, and the bottom of the treatment tank is connected to the sewage pipe.

[0009] Furthermore, a plurality of first cleaning rods are horizontally fixedly connected to the top edge of the annular plate, and first bristles are evenly arranged on the bottom of the first cleaning rods, and the first bristles are in contact with the top of the aeration plate.

[0010] Furthermore, a plurality of second cleaning rods are horizontally arranged at the bottom of the filter plate, and one end of the second cleaning rod close to the drive shaft is fixedly connected to the side of the drive shaft. The top of the second cleaning rod is evenly provided with second bristles, and the second bristles are kept in contact with the bottom of the filter plate.

[0011] Furthermore, a transverse plate matching the width of the dial plate is horizontally provided on the top of the dial plate, and a connecting block is fixedly connected between the bottom of the transverse plate and the top of the dial plate.

[0012] Furthermore, a plurality of movable rods are arranged in parallel on the upward side of the shift plate, and the movable rods are slidably inserted in the gaps between the plurality of guide plates and the shift plate. A baffle is fixedly connected between the top ends of the plurality of movable rods, and the height of the baffle is greater than the thickness of the movable rod. A plurality of cleaning strips are evenly fixedly connected on both sides of the movable rod, and one end of the cleaning strip is tilted downward.

[0013] Furthermore, a plurality of guide plates are distributed in a ring around the top of the annular plate, the guide plates are tilted upward close to one end of the sleeve, and the upward side of the plurality of guide plates is fixedly connected to the same fixed ring, the fixed ring is rotatably connected to the inner wall of the bottom end of the sleeve, a plurality of fourth connecting rods are fixedly connected between the inner side of the fixed ring and the drive shaft, a guide strip is fixedly connected to the side of the bottom of the guide plate away from its rotation direction, and the guide strip cooperates with the guide plate to form a guide groove.

[0014] Furthermore, the water inlet pipe and the drain pipe are located at the bottom and top of the filter plate respectively, and the water inlet pipe is close to the top of the annular plate.

[0015] Furthermore, a plurality of guide strips are evenly and fixedly connected to the upper side of the scraper, and the top end of the guide strips is inclined toward the direction close to the sleeve.

[0016] The present invention also discloses a control method for an aerobic granular sludge sewage treatment device for enhanced denitrification and phosphorus removal, comprising the following steps:

[0017] S1: When treating sewage, the sewage and granular sludge are introduced into the treatment tank through the water inlet pipe, and the liquid level of the sewage is higher than the top of the filter plate;

[0018] S2: Start the motor and aeration plate, and the drive shaft drives the scraper to scrape along the bottom inner wall of the treatment tank, thereby shoveling up the granular sludge on the bottom inner wall of the treatment tank to prevent the granular sludge from depositing on the bottom inner wall of the treatment tank and maintain the biological activity of the aerobic granular sludge;

[0019] S3: The granular sludge picked up by the scraper moves upward along the upward side of the scraper. At the same time, the auger blades cooperate with the sleeve to move the granular sludge picked up by the scraper out of the sleeve through the through hole and locate it in the upper half of the treatment tank, thereby promoting the circulation speed of granular sludge at different heights in the treatment tank and the efficiency of contact with oxygen generated by aeration, thereby ensuring the treatment effect of granular sludge on wastewater denitrification and phosphorus removal;

[0020] S4: In addition, as the drive shaft rotates, the multiple paddles are driven to rotate around the sleeve. Under the guidance of the guide plates, sewage and granular sludge can continuously pass through the gap between the guide plates and the paddle plates, forming a certain shear force under the condition of high flow rate. Under the shear force condition, the density of the granular sludge is further increased, thereby improving the treatment efficiency of the granular sludge for sewage denitrification and phosphorus removal;

[0021] S5: After the sewage treatment is completed, the sewage can be filtered through the filter plate and discharged through the drain pipe, while the granular sludge can be left in the treatment tank and participate in the subsequent sewage treatment operation. After the granular sludge has been used for a period of time, it can be discharged from the treatment tank together with the sewage through the drain pipe.

[0022] Technical effects and advantages of the present invention:

[0023] 1. During the sewage treatment process, the present invention can scoop up the granular sludge on the inner wall of the bottom of the treatment tank by a scraper, thereby preventing the granular sludge from being deposited on the inner wall of the bottom of the treatment tank. The granular sludge scooped up by the scraper can then move upward along the upward side of the scraper and be transported upward under the cooperative action of the auger blades and the sleeve. The granular sludge that has then entered the sleeve can then be moved out of the sleeve through the through hole and located in the upper half of the treatment tank, thereby promoting the circulation speed of the granular sludge at different heights in the treatment tank and the efficiency of its contact with oxygen generated by aeration. There is a pollutant concentration gradient at different heights in the tank body, which accelerates the circulation speed of the aerobic granular sludge, thereby further increasing the particle size of the aerobic granular sludge, maintaining the biological activity of the granular sludge, and thus ensuring the treatment effect of the granular sludge on the denitrification and phosphorus removal of sewage;

[0024] 2. The present invention is provided with a paddle plate. When sewage and granular sludge impact the upward side of the paddle plate, the sewage and granular sludge can continuously pass through the gap between the guide plate and the paddle plate under the guiding action of the guide plate. When the granular sludge and sewage pass through the gap between the guide plate and the paddle plate, the gap is narrow, thereby increasing the flow rate of the sewage and granular sludge. As the flow rate of the sewage and granular sludge increases, the pressure on the granular sludge and sewage also increases, thereby enabling the nitrogen and phosphorus in the sewage to be absorbed and decomposed by the granular sludge more quickly, thereby improving the treatment efficiency of the granular sludge for sewage. By setting the gap, a certain shear force is formed under the condition of higher flow rate, and the density of the granular sludge is further increased under the shear force condition, thereby improving the denitrification and phosphorus removal efficiency of the granular sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the overall structure of the present invention Figure 2 ;

[0027] Figure 3 It is a cross-sectional view of the overall structure of the present invention;

[0028] Figure 4 It is a three-dimensional schematic diagram of the filter plate, sleeve, guide plate and second cleaning rod structure of the present invention;

[0029] Figure 5 It is a three-dimensional schematic diagram of the drive shaft, auger blades, annular plate, aeration disk and first cleaning rod in the present invention;

[0030] Figure 6It is a three-dimensional schematic diagram of the scraper, fixed tube, annular plate, first bristles and guide strips in the present invention;

[0031] Figure 7 It is a three-dimensional schematic diagram of the guide plate, the fixing ring, the fourth connecting rod and the guide strip in the present invention;

[0032] Figure 8 It is a three-dimensional schematic diagram of the stirring assembly, the horizontal plate, the movable rod, the baffle and the cleaning strip in the present invention.

[0033] In the figure: 1. treatment tank; 2. aeration plate; 3. air inlet pipe; 4. scraper; 5. fixed pipe; 6. annular plate; 7. sleeve; 8. stirring assembly; 81. paddle plate; 82. third connecting rod; 83. guide plate; 9. through hole; 10. first connecting rod; 11. drive shaft; 12. motor; 13. second connecting rod; 14. auger blade; 15. filter plate; 16. water inlet pipe; 17. drain pipe; 18. sewage pipe; 19. first cleaning rod; 20. first brush; 21. second cleaning rod; 22. second brush; 23. horizontal plate; 24. movable rod; 25. baffle; 26. cleaning strip; 27. drainage plate; 28. fixed ring; 29. ​​fourth connecting rod; 30. drainage strip; 31. guide strip. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0035] The present invention provides Figures 1 to 8 The aerobic granular sludge sewage treatment equipment with enhanced nitrogen and phosphorus removal shown in the figure includes a treatment tank 1, an aeration plate 2 is provided at the bottom of the treatment tank 1, an air inlet pipe 3 is vertically connected to the center of the bottom end of the aeration plate 2, a plurality of inclined scrapers 4 are distributed in an annular manner on the periphery of the air inlet pipe 3, a plurality of the scrapers 4 are fixedly connected to a fixed pipe 5 at one end close to the air inlet pipe 3, and a plurality of the scrapers 4 are fixedly connected to the same annular plate 6 at one end away from the fixed pipe 5, a sleeve 7 is provided on the top of the aeration plate 2 that is coaxial with the annular plate 6, a plurality of stirring assemblies 8 are distributed in an annular manner on the outer side of the sleeve 7, and a drive shaft 11 is inserted and inserted vertically and rotatably at the center of the top of the sleeve 7;

[0036] The stirring assembly 8 includes an inclined dial plate 81, a third connecting rod 82 being fixedly connected between the downward side of the dial plate 81 and the drive shaft 11, both sides of the dial plate 81 protruding upward, and a plurality of guide plates 83 being evenly arranged from top to bottom on the side of the dial plate 81 away from the third connecting rod 82, the two sides of the guide plates 83 being fixedly connected to the upwardly protruding parts on both sides of the dial plate 81, the upward side of the guide plates 83 being inclined toward the direction close to the dial plate 81, and a gap being present between the guide plates 83 and the side of the dial plate 81 away from the third connecting rod 82;

[0037] The air inlet pipe 3 is inserted through the bottom inner wall of the treatment tank 1, the bottom of the scraper 4 is fitted with the bottom inner wall of the treatment tank 1, the fixed pipe 5 is rotatably sleeved on the air inlet pipe 3, the outer side of the annular plate 6 is fitted with the inner wall of the treatment tank 1, the opening of the sleeve 7 is downward, and a plurality of through holes 9 are opened on the side of the sleeve 7 near the top, and a plurality of first connecting rods 10 are fixedly connected between the outer side of the sleeve 7 and the inner wall of the treatment tank 1, the top end of the drive shaft 11 is rotatably inserted through the top center of the treatment tank 1, and the top end of the drive shaft 11 is transmission-connected to the motor 12, and the bottom end of the drive shaft 11 is connected to the A plurality of second connecting rods 13 are fixedly connected between the tops of the annular plates 6. The portion of the drive shaft 11 located in the sleeve 7 is fixedly connected to an auger blade 14. A filter plate 15 is horizontally provided on the top of the sleeve 7. The filter plate 15 is fixedly connected to the side wall of the treatment tank 1, and the filter plate 15 is rotatably sleeved on the drive shaft 11. A water inlet pipe 16 and a drain pipe 17 are connected to the side of the treatment tank 1. A sewage pipe 18 is connected to the bottom of the treatment tank 1. The water inlet pipe 16 and the drain pipe 17 are located at the bottom and top of the filter plate 15, respectively, and the water inlet pipe 16 is close to the top of the annular plate 6.

[0038] By providing a scraper 4, when treating sewage, the sewage together with the granular sludge is introduced into the treatment tank 1 through the water inlet pipe 16, and the liquid level of the sewage is higher than the liquid level of the filter plate 15, and then the motor 12 and the aeration plate 2 are started. As the motor 12 is started, the drive shaft 11 can start to rotate under the action of the motor 12, and as the drive shaft 11 rotates, the scraper 4 can be driven by the drive shaft 11 to scrape along the bottom inner wall of the treatment tank 1, thereby shoveling up the granular sludge on the bottom inner wall of the treatment tank 1, preventing the granular sludge from being deposited on the bottom inner wall of the treatment tank 1, maintaining the biological activity of the aerobic granular sludge, and then the granules shoveled up by the scraper 4 The sludge can move upward along the upward side of the scraper 4. At the same time, as the drive shaft 11 rotates, the auger blades 14 can cooperate with the sleeve 7 under the drive shaft 11 to transport the granular sludge scooped up by the scraper 4 upward. The granular sludge that then enters the sleeve 7 can be moved out of the sleeve 7 through the through hole 9 and located in the upper half of the treatment tank 1, thereby promoting the circulation speed of the granular sludge at different heights in the treatment tank 1 and the efficiency of contact with the oxygen generated by aeration, accelerating the circulation speed of the aerobic granular sludge, thereby further increasing the particle size of the aerobic granular sludge, maintaining the biological activity of the granular sludge, and thus ensuring the treatment effect of the granular sludge on the denitrification and phosphorus removal of sewage;

[0039] In addition, as the drive shaft 11 rotates, the drive shaft 11 can drive the multiple paddles 81 to rotate around the sleeve 7 through the multiple third connecting rods 82. As the paddles 81 rotate, when the sewage and granular sludge impact the upward side of the paddles 81, the sewage and granular sludge can continuously pass through the gap between the guide plates 83 and the paddles 81 under the guidance of the guide plates 83. When the granular sludge and sewage pass through the gap between the guide plates 83 and the paddles 81, the narrow gap can increase the flow rate of the sewage and granular sludge. As the flow rate of the sewage and granular sludge increases, the pressure on the granular sludge and sewage also increases, thereby enabling pollutants such as nitrogen and phosphorus in the sewage to be absorbed and decomposed more quickly by the granular sludge. By controlling the width of the gap, the flow rate of the granular sludge and sewage is controlled, and a certain shear force is formed under the condition of higher flow rate. Under the shear force condition, the density of the granular sludge is further increased, thereby improving the treatment efficiency of the granular sludge for sewage denitrification and phosphorus removal.

[0040] After the sewage treatment is completed, the sewage can be filtered through the filter plate 15 and discharged through the drain pipe 17, while the granular sludge can be retained in the treatment tank 1 and participate in the subsequent sewage treatment operation. After the granular sludge has been used for a period of time, the granular sludge can be discharged from the treatment tank 1 together with the sewage through the drain pipe 18.

[0041] like Figures 3 to 6As shown, a plurality of first cleaning rods 19 are horizontally fixedly connected to the top edge of the annular plate 6, and first bristles 20 are evenly arranged on the bottom of the first cleaning rods 19, and the first bristles 20 are in contact with the top of the aeration plate 2;

[0042] By providing the first bristles 20 , during the rotation of the drive shaft 11 , the first bristles 20 can brush against the top of the aeration disc 2 , thereby ensuring that the aeration disc 2 is not clogged by granular sludge, thereby ensuring the aeration effect of the aeration disc 2 .

[0043] like Figure 4 As shown, a plurality of second cleaning rods 21 are horizontally arranged at the bottom of the filter plate 15, and one end of the second cleaning rod 21 close to the drive shaft 11 is fixedly connected to the side of the drive shaft 11, and the top of the second cleaning rod 21 is evenly provided with second bristles 22, and the second bristles 22 are kept in contact with the bottom of the filter plate 15;

[0044] By providing the second bristles 22 , during the rotation of the drive shaft 11 , the second bristles 22 can brush against the bottom of the filter plate 15 , thereby ensuring that the filter plate 15 is not clogged by granular sludge, thereby ensuring the filtering effect of the filter plate 15 .

[0045] like Figure 3 and Figure 8 As shown, a horizontal plate 23 matching its width is provided horizontally on the top of the dial plate 81, and a connecting block is fixedly connected between the bottom of the horizontal plate 23 and the top of the dial plate 81;

[0046] By providing the transverse plate 23, when the sewage and granular sludge move upward along the upward side of the paddle 81, when the sewage and granular sludge come into contact with the transverse plate 23, the transverse plate 23 can shield the sewage and granular sludge, so that the sewage and granular sludge flow in a horizontal direction under the guidance of the transverse plate 23, thereby preventing the upward-flowing sewage from driving the granular sludge to impact the filter plate 15 and causing blockage of the filter plate 15.

[0047] like Figure 8 As shown, a plurality of movable rods 24 are provided in parallel on the upward side of the paddle plate 81. The movable rods 24 are slidably inserted into the gaps between the plurality of guide plates 83 and the paddle plate 81. A baffle 25 is fixedly connected between the top ends of the plurality of movable rods 24. The height of the baffle 25 is greater than the thickness of the movable rod 24. A plurality of cleaning strips 26 are evenly fixedly connected on both sides of the movable rod 24. One end of the cleaning strip 26 is tilted downward.

[0048] By providing the cleaning bar 26, when the sewage moves upward along the paddle plate 81 together with the granular sludge, as the sewage impacts the baffle 25, the baffle 25 can pull the multiple movable rods 24 to move along the upward side of the paddle plate 81, and as the force of the sewage impacting the baffle 25 varies, the distance moved by the movable rod 24 also varies, so that the movable rod 24 can move up and down along the upward side of the paddle plate 81 under the action of its own gravity and the impact force of the sewage. In the process of the movement of the movable rod 24, the cleaning bar 26 can repeatedly move in the gap between the guide plate 83 and the paddle plate 81, thereby effectively preventing the gap between the guide plate 83 and the paddle plate 81 from being blocked by granular sludge. In addition, since one end of the cleaning bar 26 is tilted downward, granular sludge can be prevented from remaining on the cleaning bar 26.

[0049] like Figure 4 and Figure 7 As shown, a plurality of guide plates 27 are distributed in an annular manner on the top of the annular plate 6. The guide plates 27 are inclined upward at one end close to the sleeve 7, and a same fixing ring 28 is fixedly connected to the upward side of the plurality of guide plates 27. The fixing ring 28 is rotatably connected to the inner wall of the bottom end of the sleeve 7. A plurality of fourth connecting rods 29 are fixedly connected between the inner side of the fixing ring 28 and the drive shaft 11. A guide strip 30 is fixedly connected to the side of the bottom of the guide plate 27 away from its rotation direction, and the guide strip 30 cooperates with the guide plate 27 to form a guide groove.

[0050] By providing the drainage plates 27, when the granular sludge at the bottom of the treatment tank 1 is scooped up by the scraper 4, as the drive shaft 11 rotates, the multiple drainage plates 27 can also move with the drive shaft 11. When the suspended granular sludge and bubbles come into contact with the drainage strips 30 at the bottom of the drainage plates 27, part of the granular sludge and bubbles can enter the bottom of the sleeve 7 along the drainage groove, and then as the auger blades 14 rotate, the granular sludge and bubbles at the bottom of the sleeve 7 can be quickly sucked into the sleeve 7, thereby accelerating the contact efficiency between the granular sludge and air in the lower half of the treatment tank 1.

[0051] like Figure 6 As shown, a plurality of guide strips 31 are evenly fixedly connected to the upper side of the scraper 4, and the top of the guide strips is inclined toward the direction close to the sleeve 7;

[0052] By providing the guide bar 31, when the granular sludge at the bottom of the treatment tank 1 is scooped up by the scraper 4, the granular sludge can pass through the bottom of the sleeve 7 more quickly and enter the interior of the sleeve 7 under the guidance of the guide bar 31, thereby accelerating the circulation speed of granular sludge at different heights inside the treatment tank 1, and thus ensuring the treatment effect of the granular sludge on sewage.

[0053] The present invention also discloses a control method for an aerobic granular sludge sewage treatment device for enhanced nitrogen and phosphorus removal, comprising the following steps:

[0054] S1: When treating sewage, the sewage and granular sludge are introduced into the treatment tank 1 through the water inlet pipe 16, and the liquid level of the sewage is higher than the top of the filter plate 15;

[0055] S2: Start the motor 12 and the aeration plate 2, and the drive shaft 11 drives the scraper 4 to scrape against the bottom inner wall of the treatment tank 1, thereby shoveling up the granular sludge on the bottom inner wall of the treatment tank 1, preventing the granular sludge from being deposited on the bottom inner wall of the treatment tank 1, and maintaining the biological activity of the aerobic granular sludge;

[0056] S3: The granular sludge scooped up by the scraper 4 moves upward along the upward side of the scraper 4. At the same time, the auger blades 14 cooperate with the sleeve 7 to move the granular sludge scooped up by the scraper 4 out of the sleeve 7 through the through hole 9 and locate in the upper half of the treatment tank 1, thereby promoting the circulation speed of the granular sludge at different heights in the treatment tank 1 and the efficiency of contact with the oxygen generated by aeration, thereby ensuring the treatment effect of the granular sludge on the denitrification and phosphorus removal of the sewage;

[0057] S4: In addition, as the drive shaft 11 rotates, the multiple paddles 81 are driven to rotate around the sleeve 7. The sewage and granular sludge can continuously pass through the gap between the guide plate 83 and the paddle plate 81 under the guidance of the guide plate 83, forming a certain shear force under the condition of high flow rate. Under the shear force condition, the density of the granular sludge is further increased, thereby improving the treatment efficiency of the granular sludge for sewage denitrification and phosphorus removal;

[0058] S5: After the sewage treatment is completed, the sewage can be filtered through the filter plate 15 and discharged through the drain pipe 17, while the granular sludge can be retained in the treatment tank 1 and participate in the subsequent sewage treatment operation. After the granular sludge has been used for a period of time, the granular sludge can be discharged from the treatment tank 1 together with the sewage through the drain pipe 18.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. An aerobic granular sludge sewage treatment equipment for enhanced nitrogen and phosphorus removal, comprising a treatment tank (1), characterized in that: An aeration plate (2) is provided at the bottom of the treatment tank (1), an air inlet pipe (3) is vertically connected to the center of the bottom end of the aeration plate (2), a plurality of inclined scrapers (4) are distributed in an annular manner on the periphery of the air inlet pipe (3), a plurality of scrapers (4) are fixedly connected to a fixed pipe (5) at one end close to the air inlet pipe (3), and a plurality of scrapers (4) are fixedly connected to the same annular plate (6) at one end away from the fixed pipe (5), a sleeve (7) coaxial with the annular plate (6) is provided at the top of the aeration plate (2), a plurality of stirring assemblies (8) are distributed in an annular manner on the outer side of the sleeve (7), and a drive shaft (11) is vertically rotated and inserted through the center of the top of the sleeve (7); The stirring assembly (8) includes an inclined dial plate (81), a third connecting rod (82) is fixedly connected between a downward side of the dial plate (81) and the driving shaft (11), both sides of the dial plate (81) protrude upward, and a plurality of guide plates (83) are evenly arranged from top to bottom on a side of the dial plate (81) away from the third connecting rod (82), and both sides of the guide plates (83) are respectively fixedly connected to the upwardly protruding parts of both sides of the dial plate (81), and the upward side of the guide plates (83) is inclined in a direction close to the dial plate (81), and a gap exists between the guide plates (83) and the side of the dial plate (81) away from the third connecting rod (82); The opening of the sleeve (7) faces downward, and a plurality of through holes (9) are formed on the side of the sleeve (7) near the top. A plurality of first connecting rods (10) are fixedly connected between the outer side of the sleeve (7) and the inner wall of the treatment tank (1). The top end of the drive shaft (11) is rotatably inserted into the top center of the treatment tank (1), and the top end of the drive shaft (11) is connected to the motor (12). A plurality of first connecting rods (10) are fixedly connected between the bottom end of the drive shaft (11) and the top of the annular plate (6). Two connecting rods (13), the portion of the drive shaft (11) located in the sleeve (7) is fixedly connected to an auger blade (14), a filter plate (15) is horizontally arranged on the top of the sleeve (7), the filter plate (15) is fixedly connected to the side wall of the treatment tank (1), and the filter plate (15) is rotatably sleeved on the drive shaft (11), the side of the treatment tank (1) is connected to a water inlet pipe (16) and a drain pipe (17), and the bottom of the treatment tank (1) is connected to a sewage pipe (18); A plurality of movable rods (24) are arranged in parallel on the upward side of the shift plate (81), and the movable rods (24) are slidably inserted in the gaps between the plurality of guide plates (83) and the shift plate (81). A baffle (25) is fixedly connected between the top ends of the plurality of movable rods (24), and the height of the baffle (25) is greater than the thickness of the movable rod (24). A plurality of cleaning strips (26) are evenly fixedly connected to both sides of the movable rod (24), and one end of the cleaning strip (26) is tilted downward.

2. The aerobic granular sludge sewage treatment equipment for enhanced nitrogen and phosphorus removal according to claim 1 is characterized by: The air inlet pipe (3) is inserted through the inner wall of the bottom of the treatment tank (1), the bottom of the scraper (4) is in contact with the inner wall of the bottom of the treatment tank (1), the fixed pipe (5) is rotatably sleeved on the air inlet pipe (3), and the outer side of the annular plate (6) is in contact with the inner wall of the treatment tank (1).

3. The aerobic granular sludge sewage treatment equipment for enhanced nitrogen and phosphorus removal according to claim 2 is characterized by: A plurality of first cleaning rods (19) are horizontally fixedly connected to the top edge of the annular plate (6), and first bristles (20) are evenly arranged on the bottom of the first cleaning rods (19), and the first bristles (20) are in contact with the top of the aeration plate (2).

4. The aerobic granular sludge sewage treatment equipment for enhanced nitrogen and phosphorus removal according to claim 3 is characterized by: A plurality of second cleaning rods (21) are horizontally arranged at the bottom of the filter plate (15), and one end of the second cleaning rod (21) close to the drive shaft (11) is fixedly connected to the side of the drive shaft (11). Second bristles (22) are evenly arranged on the top of the second cleaning rod (21), and the second bristles (22) are kept in contact with the bottom of the filter plate (15).

5. The aerobic granular sludge sewage treatment equipment for enhanced nitrogen and phosphorus removal according to claim 4 is characterized in that: A transverse plate (23) matching the width of the dial plate (81) is horizontally provided on the top of the dial plate (81), and a connecting block is fixedly connected between the bottom of the transverse plate (23) and the top of the dial plate (81).

6. The aerobic granular sludge sewage treatment equipment for enhanced nitrogen and phosphorus removal according to claim 5 is characterized by: A plurality of guide plates (27) are distributed in a circular pattern on the top of the annular plate (6), and the guide plates (27) are tilted upward at one end close to the sleeve (7), and the upper side of the plurality of guide plates (27) is fixedly connected to a same fixing ring (28), and the fixing ring (28) is rotatably connected to the inner wall of the bottom end of the sleeve (7). A plurality of fourth connecting rods (29) are fixedly connected between the inner side of the fixing ring (28) and the drive shaft (11), and a guide strip (30) is fixedly connected to the side of the bottom of the guide plate (27) away from the rotation direction thereof, and the guide strip (30) cooperates with the guide plate (27) to form a guide groove.

7. The aerobic granular sludge sewage treatment equipment for enhanced nitrogen and phosphorus removal according to claim 6, characterized in that: The water inlet pipe (16) and the drain pipe (17) are located at the bottom and top of the filter plate (15), respectively, and the water inlet pipe (16) is close to the top of the annular plate (6).

8. The aerobic granular sludge sewage treatment equipment for enhanced nitrogen and phosphorus removal according to claim 7, characterized in that: A plurality of guide strips (31) are evenly and fixedly connected to the upward side of the scraper (4), and the top end of the guide strips is inclined in a direction close to the sleeve (7).

9. A control method for an aerobic granular sludge sewage treatment device for enhanced denitrification and phosphorus removal, applied to the aerobic granular sludge sewage treatment device for enhanced denitrification and phosphorus removal according to claim 8, characterized in that: The following steps are involved: S1: When treating sewage, the sewage together with the granular sludge is introduced into the treatment tank (1) through the water inlet pipe (16), and the liquid level of the sewage is made higher than the top of the filter plate (15); S2: starting the motor (12) and the aeration plate (2), and driving the shaft (11) to drive the scraper (4) to scrape against the bottom inner wall of the treatment tank (1), thereby shoveling up the granular sludge on the bottom inner wall of the treatment tank (1), preventing the granular sludge from being deposited on the bottom inner wall of the treatment tank (1), and maintaining the biological activity of the aerobic granular sludge; S3: The granular sludge scooped up by the scraper (4) moves upward along the upward side of the scraper (4). At the same time, the auger blade (14) cooperates with the sleeve (7) to move the granular sludge scooped up by the scraper (4) out of the sleeve (7) through the through hole (9) and is located in the upper half of the treatment tank (1), thereby promoting the circulation speed of the granular sludge at different heights in the treatment tank (1) and the efficiency of contact with the oxygen generated by aeration, thereby ensuring the treatment effect of the granular sludge on the denitrification and dephosphorization of sewage; S4: In addition, as the driving shaft (11) rotates, the plurality of paddles (81) are driven to rotate around the sleeve (7), and the sewage and granular sludge can continuously pass through the gap between the guide plate (83) and the paddle plate (81) under the guidance of the guide plate (83); S5: After the sewage treatment is completed, the sewage can be filtered through the filter plate (15) and discharged through the drain pipe (17), while the granular sludge can be left in the treatment tank (1) and participate in the subsequent sewage treatment operation. After the granular sludge has been used for a period of time, the granular sludge can be discharged from the treatment tank (1) together with the sewage through the drain pipe (18).

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