Denitrification device for town sewage treatment

Abstract

The invention discloses a denitrification device for town sewage treatment, and relates to the technical field of sedimentation pools, the denitrification device comprises a sedimentation pool main body, the sedimentation pool main body is provided with a driving mechanism, an oil removal mechanism and a flocculant feeding mechanism, the bottom of the sedimentation pool main body is provided with a sewage inlet pipe and a sewage discharge pipe, and the edge of the inner end surface of the sedimentation pool main body is provided with an overflow plate. A clear water outlet is formed in the side wall of the sedimentation tank main body, an annular reflecting cover and an annular steady flow plate are arranged in the sedimentation tank main body, the driving mechanism comprises a driving motor, a speed reducer, a central shaft pipe and a sludge scraper, the driving motor drives the central shaft pipe through the speed reducer, and the bottom of the central shaft pipe is communicated with a sewage inlet pipe. The invention aims to provide the denitrification device for town sewage treatment, the denitrification device has the advantages of simple structure, convenience in maintenance, high oil removal efficiency and accurate flocculant addition, and the problems of complex equipment, high maintenance cost, poor oil removal effect and agent waste of a traditional secondary sedimentation tank are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sedimentation tanks, and particularly to a denitrification device for urban sewage treatment. Background Art

[0002] With the acceleration of urbanization and the development of industry, the sewage discharge volume has been increasing day by day, causing serious pollution to the environment. Urban sewage treatment is an important part of environmental protection, and the denitrification process is crucial for reducing water eutrophication.

[0003] The sewage denitrification process includes pretreatment, primary sedimentation tank, biological denitrification treatment, secondary sedimentation tank, disinfection and sludge treatment. During secondary sedimentation, the secondary sedimentation tank is used to separate the activated sludge. However, the existing secondary sedimentation tanks often have the following problems: First, the equipment structure is complex and the maintenance cost is high; second, the oil removal effect is not good, and the floating oil layer hinders the effective progress of subsequent treatment steps; third, the addition of flocculant is not accurate enough, which is likely to cause waste of chemicals or unstable treatment effects. Therefore, a denitrification device for urban sewage treatment is needed to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a denitrification device for urban sewage treatment, which has the advantages of simple structure, convenient maintenance, high-efficiency oil removal and accurate dosing of flocculant, and solves the problems of complex equipment, high maintenance cost, poor oil removal effect and chemical waste in traditional secondary sedimentation tanks.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A denitrification device for urban sewage treatment, including a sedimentation tank main body, on which a driving mechanism, an oil removal mechanism and a flocculant dosing mechanism are arranged; A sewage inlet pipe and a sewage discharge pipe are arranged at the bottom of the sedimentation tank main body, an overflow plate is arranged at the edge of the inner end face of the sedimentation tank main body, a clear water outlet is arranged on the side wall of the sedimentation tank main body, and an annular reflection cover and an annular flow stabilizer are arranged inside the sedimentation tank main body; The driving mechanism includes a driving motor, a reducer, a central shaft pipe and a sludge scraper. The driving motor drives the central shaft pipe through the reducer. The bottom of the central shaft pipe communicates with the sewage inlet pipe. The bottom of the central shaft pipe is rotationally connected to the sedimentation tank main body and the sewage inlet pipe. A sewage outlet is arranged at the top of the side end face of the central shaft pipe; The oil removal mechanism includes a floating oil collection rack, a screw rod, an oil scraping plate and a floating cylinder. The oil removal mechanism is fixedly installed at the upper end of the annular flow stabilizer; The flocculant dosing mechanism includes a flocculant storage tank, a guide pipe, a guiding pipe, a dosing roller, a medicine blocking cover and a dosage adjustment assembly. The flocculant dosing mechanism is installed above the oil removal mechanism and fixed to the sedimentation tank main body.

[0006] Preferably, as a denitrification device for urban sewage treatment according to the present invention, the flocculant storage tank is fixedly installed on the upper end surface of the sedimentation tank body. The feeding pipe communicates with the bottom of the flocculant storage tank. A feeding chute is arranged at the bottom of the feeding pipe. An inlet communicating with the feeding chute is arranged at the top of the guiding pipe. A discharge port is arranged at the top of the guiding pipe. The feeding roller is installed in the guiding pipe and is rotatably connected thereto. Partition plates are arranged on the surface of the feeding roller, and a medicine storage tank is formed between the partition plates. The medicine blocking cover is sleeved on the outer end of the feeding roller and is fixedly connected thereto.

[0007] Preferably, as a denitrification device for urban sewage treatment according to the present invention, an isolation belt and an elastic winding roller are arranged in the medicine storage tank. The elastic winding roller is installed at the bottom of the medicine storage tank and is rotatably connected to the partition plate through a torsion spring. One end of the isolation belt is fixedly installed on the elastic winding roller, and the end of the isolation belt far from the elastic winding roller is fixedly installed on the partition plate.

[0008] Preferably, as a denitrification device for urban sewage treatment according to the present invention, the medicine amount adjusting assembly includes a lifting rod, a guiding column and an adjusting bolt. A first chute extending axially is arranged at the center of the feeding roller. The bottom of the medicine storage tank is communicated with the first chute. The guiding column is installed in the first chute and is slidably connected to the feeding roller. A guiding bushing is arranged inside the partition plate and passes through the lifting rod and is slidably connected thereto. A threaded hole is arranged at the bottom of the feeding roller, and the adjusting bolt passes through the threaded hole and is threadedly connected to the feeding roller. A guiding wheel fitting the isolation belt is arranged at the top of the lifting rod. The bottom of the lifting rod is of a conical structure. The left and right sides of the guiding column are of conical structures. The top of the adjusting bolt is of a conical structure. The bottom of the lifting rod fits the right side of the guiding column, and the top of the adjusting bolt fits the left side of the guiding column.

[0009] Preferably, as a denitrification device for urban sewage treatment according to the present invention, a vertical plate is arranged in the first chute. A compression spring is arranged between the guiding column and the vertical plate. The guiding column and the feeding roller are elastically slidably connected through the compression spring.

[0010] Preferably, as a denitrification device for urban sewage treatment according to the present invention, a maintenance cover corresponding to the position of the adjusting bolt is arranged on the medicine blocking cover. A third rotating shaft rotatably connected to the medicine blocking cover is arranged on the side surface of the maintenance cover. A fixing bolt for fixing is arranged at the end of the maintenance cover far from the third rotating shaft. A maintenance window is arranged on the side surface of the guiding pipe.

[0011] Preferably, as a denitrification device for urban sewage treatment according to the present invention, the floating oil collection rack is fixedly installed at the upper end of the annular steady flow plate. A collection tank is arranged on the upper end surface of the floating oil collection rack. An oil discharge pipe is arranged at the bottom of the collection tank. The auger rod is installed in the collection tank and rotatably connected to the floating oil collection rack. A first rotating shaft rotatably connected to the floating oil collection rack is arranged on the side surface of the oil shoveling plate. The floating cylinder is fixedly installed at the bottom of the oil shoveling plate.

[0012] Preferably, as a denitrification device for urban sewage treatment according to the present invention, a second gear umbrella is arranged on the central shaft tube. A first gear umbrella meshing with the second gear umbrella is arranged on the central shaft of the auger rod. A second synchronous pulley is arranged on the central shaft of the auger rod. A second rotating shaft is arranged on the side surface of the feeding roller. A first synchronous pulley cooperating with the second synchronous pulley is arranged on the second rotating shaft. A synchronous belt for transmission is sleeved on the first synchronous pulley and the second synchronous pulley.

[0013] Preferably, as a denitrification device for urban sewage treatment according to the present invention, the floating cylinder is of a hollow cylindrical structure. A water injection port is arranged at the upper end of the floating cylinder.

[0014] Preferably, as a denitrification device for urban sewage treatment according to the present invention, a guide plate is arranged at the bottom of the guide pipe. The material guide pipe is of an inclined structure. The height of the material guide pipe gradually decreases from the end of the flocculant storage tank to the end of the central shaft tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By adding a flocculant feeding mechanism at the upper end of the sedimentation tank main body, the partition on the feeding roller forms a medicine storage tank. Cooperating with the medicine blocking cover, it realizes automatic and continuous small-dose addition of the flocculant, ensures its uniform coverage of the sedimentation tank water area, effectively reduces waste. The isolation belt and the elastic winding roller in the medicine storage tank enable users to freely adjust the medicine storage amount according to the water quality. The medicine amount adjustment assembly further makes the depth of the medicine storage tank change synchronously according to the distance from the central shaft tube through structures such as adjusting bolts, guide posts, and lifting rods, meeting the needs of uneven distribution of sediment in the sewage. At the same time, the maintenance cover and the maintenance window facilitate the operation of the adjusting bolts, and the material guide pipe and the guide plate ensure stable feeding of the flocculant and its full mixing with the sewage, accurately controlling the feeding amount and the feeding position, improving the flocculation effect, and solving the problems existing in the traditional flocculant feeding method, such as uneven feeding, inability to adjust the feeding amount according to the water quality, mismatch between the feeding amount and the distribution of sewage sediment, inconvenient adjustment operation, and easy waste of the flocculant.

[0016] 2. By setting an oil removal mechanism at the upper end of the sedimentation tank main body, the floating oil collection rack, the auger rod and the oil shoveling plate cooperate with each other. The oil shoveling plate floats on the surface of the sewage, efficiently removes the floating stains and guides them to the collection tank. The auger rod quickly pushes the garbage towards the drain pipe, greatly improving the discharging speed. The floating oil shoveling plate can also accurately remove oil when the sewage fluctuates. The design of the floating cylinder and the water injection port can flexibly adjust the height of the oil shoveling plate to ensure accurate removal of the floating oil. It solves the technical problems of low efficiency in removing floating oil on the sewage surface, unstable oil removal when the sewage fluctuates, inability to flexibly adjust the height of the oil shoveling plate, and unstable power transmission of the oil removal mechanism.

[0017] 3. Through transmission components such as the first bevel gear, the second bevel gear, the first synchronous pulley, the second synchronous pulley and the synchronous belt, the present invention cleverly connects the driving motor, the central shaft tube with the oil removal mechanism and the flocculant dosing mechanism. When the driving motor drives the central shaft tube to rotate, the oil removal mechanism and the flocculant dosing mechanism work synchronously. Only when the sludge scraper rotates to generate a vortex, creating necessary conditions for oil removal, will the flocculant be accurately dosed, avoiding the waste phenomenon that the flocculant cannot be mixed with the sediment in the sewage because it is dosed onto the floating oil. It realizes the coordinated operation of each mechanism, improves the sewage treatment efficiency and quality, and solves the technical problems of asynchronous operation of each mechanism in the sewage treatment device, cumbersome operation, resulting in waste of flocculant and human resources, and poor sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the top view of the present invention; Figure 3 is of the present invention Figure 2 sectional view A-A in; Figure 4 is of the present invention Figure 2 sectional view B-B in; Figure 5 is the exploded view of the flocculant dosing mechanism of the present invention; Figure 6 is the front sectional view of the cooperation state of the feeding roller and the guiding pipe of the present invention; Figure 7 is of the present invention Figure 3 enlarged view at C in; Figure 8 is of the present invention Figure 4 enlarged view at D in; Figure 9 is of the present invention Figure 4 enlarged view at E in; Figure 10 is of the present invention Figure 6 enlarged view at F in; Figure 11Schematic structural diagram of the drug dosage adjustment component of the present invention; Figure 12 of the present invention Figure 8 Enlarged view at G in

[0019] In the figure: 1. Sedimentation tank main body; 101. Sewage inlet pipe; 102. Annular reflection cover; 103. Overflow plate; 104. Clear water outlet; 105. Sewage discharge pipe; 106. Annular flow stabilizer plate; 2. Driving mechanism; 201. Driving motor; 202. Reducer; 203. Central shaft pipe; 2031. Sewage outlet; 2032. Second bevel gear; 204. Scraper; 3. Oil removal mechanism; 301. Floating oil collection rack; 3011. Collection tank; 3012. Oil discharge pipe; 302. Screw auger rod; 3021. First bevel gear; 3022. Second synchronous pulley; 3023. Synchronous belt; 303. Oil shoveling plate; 3031. First rotating shaft; 3032. Floating cylinder; 30321. Water injection port; 4. Flocculant dosing mechanism; 401. Flocculant storage tank; 402. Guide pipe; 4021. Feeding chute; 403. Guide pipe; 4031. Feed inlet; 4032. Discharge port; 4033. Guide plate; 4034. Maintenance window; 404. Feeding roller; 4041. First chute; 4042. Drug storage tank; 40421. Guide bushing; 4043. Isolation belt; 4044. Second rotating shaft; 4045. First synchronous pulley; 4046. Elastic winding roller; 4047. Vertical plate; 4048. Screw hole; 4049. Partition; 405. Drug blocking cover; 4051. Maintenance cover; 40511. Third rotating shaft; 40512. Fixed bolt; 406. Drug dosage adjustment component; 4061. Lifting rod; 40611. Guide wheel; 4062. Guide post; 4063. Adjusting bolt; 4064. Compression spring. Detailed implementation manners Example 1

[0020] Please refer to Figures 1 - 12 , a denitrification device for urban sewage treatment, including a sedimentation tank main body 1, and a driving mechanism 2, an oil removal mechanism 3 and a flocculant dosing mechanism 4 are arranged on the sedimentation tank main body 1; The bottom of the sedimentation tank main body 1 is provided with a sewage inlet pipe 101 and a sewage discharge pipe 105, the inner end face edge of the sedimentation tank main body 1 is provided with an overflow plate 103, the side wall of the sedimentation tank main body 1 is provided with a clear water outlet 104, and an annular reflection cover 102 and an annular flow stabilizer plate 106 are arranged inside the sedimentation tank main body 1; The driving mechanism 2 includes a driving motor 201, a speed reducer 202, a central shaft tube 203, and a sludge scraper 204. The driving motor 201 drives the central shaft tube 203 through the speed reducer 202. The bottom of the central shaft tube 203 communicates with the sewage inlet pipe 101. The bottom of the central shaft tube 203 is rotatably connected to the sedimentation tank main body 1 and the sewage inlet pipe 101. A sewage outlet 2031 is provided at the top of the side end face of the central shaft tube 203; The oil removal mechanism 3 includes an oil floating collection rack 301, a screw rod 302, an oil shoveling plate 303, and a floating cylinder 3032. The oil removal mechanism 3 is fixedly installed at the upper end of the annular flow stabilizing plate 106; The flocculant feeding mechanism 4 includes a flocculant storage tank 401, a guide pipe 402, a guiding pipe 403, a feeding roller 404, a medicine blocking cover 405, and a medicine dosage adjusting assembly 406. The flocculant feeding mechanism 4 is installed above the oil removal mechanism 3 and is fixed to the sedimentation tank main body 1 by bolts.

[0021] Further, the flocculant storage tank 401 is fixedly installed on the upper end face of the sedimentation tank main body 1. The guide pipe 402 communicates with the bottom of the flocculant storage tank 401. A blanking groove 4021 is provided at the bottom of the guide pipe 402. The top of the guiding pipe 403 is provided with a feed inlet 4031 communicating with the blanking groove 4021. The top of the guiding pipe 403 is provided with a discharge port 4032. The feeding roller 404 is installed in the guiding pipe 403 and is rotatably connected thereto. A partition plate 4049 is provided on the surface of the feeding roller 404. A medicine storage tank 4042 is formed between the partition plates 4049. The medicine blocking cover 405 is sleeved on the outer end of the feeding roller 404 and is fixedly connected thereto.

[0022] Two partition plates 4049 form a group. A medicine storage tank 4042 capable of storing flocculant is formed between each group of partition plates 4049. By blocking the non-medicine storage area with the medicine blocking cover 405, when the feeding roller 404 rotates and the medicine storage tank 4042 is located below the feed inlet 4031, the flocculant in the flocculant storage tank 401 flows into the medicine storage tank 4042 through the guide pipe 402. When the feeding roller 404 continues to rotate until the medicine storage tank 4042 is aligned with the discharge port 4032, the flocculant is discharged from the discharge port 4032, thereby realizing the automatic addition of the flocculant. The continuous small amount of addition can cover the entire water area of the sedimentation tank and can effectively reduce the waste of the flocculant.

[0023] Further, an isolation belt 4043 and an elastic winding roller 4046 are provided in the medicine storage tank 4042. The elastic winding roller 4046 is installed at the bottom of the medicine storage tank 4042 and is rotatably connected to the partition plate 4049 through a torsion spring. One end of the isolation belt 4043 is fixedly installed on the elastic winding roller 4046, and the end of the isolation belt 4043 away from the elastic winding roller 4046 is fixedly installed on the partition plate 4049.

[0024] The isolation belt 4043 divides the inside of the medicine storage tank 4042 into upper and lower areas. Only the upper end of the isolation belt 4043 can store the flocculant. Thus, the storage capacity of the medicine storage tank 4042 can be adjusted by adjusting the height of the isolation belt 4043, so as to change the amount of flocculant added during each feeding. Users can freely adjust according to the water quality.

[0025] Further, the medicine amount adjusting assembly 406 includes a lifting rod 4061, a guiding column 4062 and an adjusting bolt 4063. A first sliding groove 4041 extending axially is provided at the center of the feeding roller 404. The bottom of the medicine storage tank 4042 is connected to the first sliding groove 4041 in a penetrating manner. The guiding column 4062 is installed in the first sliding groove 4041 and is slidably connected to the feeding roller 404. A guiding bushing 40421 is provided inside the partition plate 4049. The guiding bushing 40421 passes through the lifting rod 4061 and is slidably connected thereto. A threaded hole 4048 is provided at the bottom of the feeding roller 404. The adjusting bolt 4063 passes through the threaded hole 4048 and is threadedly connected to the feeding roller 404. A guiding wheel 40611 that fits the isolation belt 4043 is provided at the top of the lifting rod 4061. The bottom of the lifting rod 4061 is of a conical structure. The left and right sides of the guiding column 4062 are of conical structures. The top of the adjusting bolt 4063 is of a conical structure. The bottom of the lifting rod 4061 fits the right side of the guiding column 4062. The top of the adjusting bolt 4063 fits the left side of the guiding column 4062.

[0026] When the adjusting bolt 4063 is rotated and fed, the adjusting bolt 4063 slides upward, thereby squeezing the guiding column 4062 to the right, so that the guiding column 4062 synchronously squeezes each lifting rod 4061 outward. The guiding wheel 40611 at the top of the guiding column 4062 lifts the isolation belt 4043, synchronously reducing the medicine storage space of the medicine storage tank 4042, realizing synchronous adjustment of the depth of the medicine storage tank 4042 according to the distance from the central shaft tube 203, meeting the sewage distribution requirements. Since there are the most sedimentations in the central sewage and the least sedimentations in the edge sewage, usually the depth of the medicine storage tank 4042 near the central shaft tube 203 is adjusted to the maximum, and the depth of the medicine storage tank 4042 far from the central shaft tube 203 is adjusted to be shallower, realizing that the amount of flocculant added is proportional to the amount of sedimentations in the sewage.

[0027] Further, a vertical plate 4047 is provided in the first sliding groove 4041. A compression spring 4064 is provided between the guiding column 4062 and the vertical plate 4047. The guiding column 4062 and the feeding roller 404 are elastically slidably connected through the compression spring 4064.

[0028] When the adjusting bolt 4063 rotates outward, the guiding column 4062 slides leftward under the reset action of the compression spring 4064, providing a certain space for the lifting rod 4061 to fall back. The isolation belt 4043 is tightened under the action of the elastic winding roller 4046, so that the lifting rod 4061 slides downward under the tension of the isolation belt 4043.

[0029] Further, a maintenance cover 4051 corresponding to the position of the adjusting bolt 4063 is provided on the medicine blocking cover 405. A third rotating shaft 40511 rotatably connected to the medicine blocking cover 405 is provided on the side of the maintenance cover 4051. A fixing bolt 40512 for fixing is provided at the end of the maintenance cover 4051 away from the third rotating shaft 40511. A maintenance window 4034 is provided on the side of the guiding pipe 403.

[0030] When the maintenance cover 4051 rotates to the maintenance window 4034, the fixing bolt 40512 is unscrewed, so that the maintenance cover 4051 can be turned outward along the third rotating shaft 40511, so that the adjusting bolt 4063 below the maintenance cover 4051 is exposed, facilitating the staff to adjust each adjusting bolt 4063 and changing the depth of the medicine storage tank 4042.

[0031] Further, the floating oil collection rack 301 is fixedly installed at the upper end of the annular steady flow plate 106. A collection groove 3011 is provided on the upper end surface of the floating oil collection rack 301. A drain pipe 3012 is provided at the bottom of the collection groove 3011. The auger rod 302 is installed in the collection groove 3011 and rotatably connected to the floating oil collection rack 301. A first rotating shaft 3031 rotatably connected to the floating oil collection rack 301 is provided on the side of the oil shoveling plate 303. A floating cylinder 3032 is fixedly installed at the bottom of the oil shoveling plate 303.

[0032] The oil shoveling plate 303 floats on the surface of the sewage, shovels the floating stains on the surface of the sewage, and guides them into the collection groove 3011 under the action of the water flow. The auger rod 302 rotates, pushing the garbage in the collection groove 3011 towards the drain pipe 3012, accelerating the discharge of the floating garbage, improving the discharge speed. The floating structure of the oil shoveling plate 303 enables the oil shoveling plate 303 to stably shovel the floating oil when the sewage fluctuates, improving the accuracy of removing surface garbage.

[0033] Further, a second tooth umbrella 2032 is provided on the central shaft tube 203. A first tooth umbrella 3021 meshing with the second tooth umbrella 2032 is provided on the central shaft of the auger rod 302. A second synchronous pulley 3022 is provided on the central shaft of the auger rod 302. A second rotating shaft 4044 is provided on the side of the feeding roller 404. A first synchronous pulley 4045 cooperating with the second synchronous pulley 3022 is provided on the second rotating shaft 4044. A synchronous belt 3023 for transmission is sleeved on the first synchronous pulley 4045 and the second synchronous pulley 3022.

[0034] When the driving motor 201 drives the central tube to rotate, the auger rod 302 is driven by the first bevel gear 3021 and the second bevel gear 2032, realizing the rapid and stable oil drainage of the oil removal mechanism 3. At the same time, the feeding roller 404 is driven by the cooperation of the first synchronous pulley 4045, the second synchronous pulley 3022 and the synchronous belt 3023, enabling the flocculant feeding mechanism 4 to operate and carry out the feeding work of the flocculant. It is realized that only when the central shaft tube 203 drives the sludge scraper 204 to rotate, the flocculant feeding mechanism 4 and the oil removal mechanism 3 will work. Because the eddy current generated when the sludge scraper 204 rotates is a necessary condition for oil removal, and only when the oil removal device is running, the flocculant can be accurately put into the sewage, avoiding the flocculant being put on the floating oil and unable to mix with the sediment in the sewage, resulting in waste of the flocculant.

[0035] Furthermore, the floating cylinder 3032 is of a hollow cylindrical structure, and a water injection port 30321 is arranged at the upper end of the floating cylinder 3032.

[0036] By injecting a certain amount of water into the water injection port 30321, the density of the floating cylinder 3032 is changed, and the height of the oil scraping plate 303 is changed, so that its average density is just between water and oil, floating on the surface of the sewage and located at the lower end of the floating oil, thereby accurately scraping the floating oil.

[0037] Furthermore, a guiding plate 4033 is arranged at the bottom of the guiding pipe 403, the material guiding pipe 402 is of an inclined structure, and the height of the material guiding pipe 402 gradually decreases from the end of the flocculant storage tank 401 to the end of the central shaft tube 203.

[0038] The gradually decreasing structure of the material guiding pipe 402 enables the flocculant particles to evenly fill the material guiding pipe 402. Thus, when the medicine storage tank 4042 is being loaded, the material guiding pipe 402 can discharge materials stably and evenly. The guiding plate 4033 structure guides the flocculant to the rear side of the floating oil collecting frame 301, where the floating oil content is the least. At this time, adding the flocculant can fully contact and mix with the sewage, effectively avoiding waste of the flocculant.

[0039] When this device is in use, according to the sewage quality, the appropriate dosage of the flocculant is determined by adjusting the dosage adjustment component 406. The specific operation is as follows: Flip the maintenance cover 4051 outwards along the third rotating shaft 40511, unscrew the fixing bolt 40512, and open the maintenance cover 4051 on the medicine blocking cover 405 corresponding to the position of the adjusting bolt 4063. Use a tool to rotate the adjusting bolt 4063. When the adjusting bolt 4063 rotates upwards, it will squeeze the guiding column 4062, and the guiding column 4062 will then synchronously squeeze each lifting rod 4061 outwards. The guiding wheel 40611 at the top of the lifting rod 4061 will lift the isolation belt 4043, synchronously reducing the medicine storage space of the medicine storage tank 4042. On the contrary, when the adjusting bolt 4063 rotates outwards, the guiding column 4062 slides leftwards under the reset action of the compression spring 4064. The isolation belt 4043 is tightened under the action of the elastic winding roller 4046, and the lifting rod 4061 slides downwards under the tension of the isolation belt 4043, increasing the medicine storage space of the medicine storage tank 4042. Adjust the medicine storage space of the medicine storage tank 4042 to gradually increase from the edge to the center of the sedimentation tank. Start the driving motor 201 to drive the central shaft tube 203 to start rotating. The rotation of the central shaft tube 203 will drive the feeding roller 404 to rotate through the cooperation of the first synchronous wheel 4045, the second synchronous wheel 3022, and the synchronous belt 3023. During the rotation of the feeding roller 404, when the medicine storage tank 4042 is located below the feeding slot 4021 of the guide pipe 402, the flocculant in the flocculant storage tank 401 flows into the medicine storage tank 4042 through the guide pipe 402. As the feeding roller 404 continues to rotate, when the medicine storage tank 4042 is aligned with the discharge port 4032 of the guide pipe 403, the flocculant is discharged from the discharge port 4032 and evenly put into the sewage in the sedimentation tank main body 1. The guiding plate 4033 at the bottom of the guide pipe 403 guides the flocculant to the rear side of the floating oil collection rack 301, so that the flocculant can be fully contacted and mixed with the sewage. The second tooth umbrella 2032 on the central shaft tube 203 meshes with the first tooth umbrella 3021 on the central shaft of the auger rod 302, driving the auger rod 302 to rotate. The oil shoveling plate 303 floats on the surface of the sewage, shoveling the floating stains on the surface of the sewage under the action of the water flow and guiding them into the collection tank 3011 on the upper end surface of the floating oil collection rack 301.The auger rod 302 rotates within the collection tank 3011, pushing the garbage in the collection tank 3011 towards the oil drain pipe 3012 to achieve rapid oil drainage. Since the oil scraping plate 303 has a floating structure, even if the sewage fluctuates, it can stably scrape the floating oil. The bottom of the central shaft pipe 203 is in communication with the sewage inlet pipe 101. Sewage enters the central shaft pipe 203 from the sewage inlet pipe 101 and then discharges into the sedimentation tank main body 1 from the sewage outlet 2031 at the top of the side end face of the central shaft pipe 203. In the environment where the sludge scraper 204 is connected to the central shaft pipe 203 and rotates to generate a vortex, the oil removal mechanism 3 can effectively remove the floating oil on the surface of the sewage. At this time, the flocculant injected by the flocculant injection mechanism 4 can be accurately injected into the sewage and fully mixed with the activated sludge in the sewage, avoiding waste caused by injecting the flocculant onto the floating oil. After the sewage undergoes flocculation precipitation in the sedimentation tank main body 1, the clear water flows out through the clear water outlet 104 on the side wall of the sedimentation tank main body 1. The impurities such as activated sludge precipitated at the bottom of the sedimentation tank main body 1 can be regularly discharged through the sewage discharge pipe 105. The sewage inlet pipe 101 continuously supplies water to ensure the continuity of the sewage treatment process.

[0040] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A denitrification device for urban sewage treatment, comprising a sedimentation tank main body (1), characterized in that: A driving mechanism (2), an oil removal mechanism (3) and a flocculant dosing mechanism (4) are arranged on the sedimentation tank main body (1); A sewage inlet pipe (101) and a sewage discharge pipe (105) are arranged at the bottom of the sedimentation tank main body (1). An overflow plate (103) is arranged at the edge of the inner end face of the sedimentation tank main body (1). A clear water outlet (104) is arranged on the side wall of the sedimentation tank main body (1). An annular reflection cover (102) and an annular flow stabilizer plate (106) are arranged inside the sedimentation tank main body (1); The driving mechanism (2) includes a driving motor (201), a speed reducer (202), a central shaft pipe (203) and a sludge scraper (204). The driving motor (201) drives the central shaft pipe (203) through the speed reducer (202). The bottom of the central shaft pipe (203) is communicated with the sewage inlet pipe (101). A sewage outlet (2031) is arranged at the top of the side end face of the central shaft pipe (203); The oil removal mechanism (3) includes an oil slick collection rack (301), an auger rod (302), an oil shoveling plate (303) and a floating drum (3032). The oil removal mechanism (3) is fixedly installed at the upper end of the annular flow stabilizer plate (106); The flocculant dosing mechanism (4) includes a flocculant storage tank (401), a guide pipe (402), a guiding pipe (403), a dosing roller (404), a medicine blocking cover (405) and a medicine amount adjusting assembly (406). The flocculant dosing mechanism (4) is installed above the oil removal mechanism (3) and fixed to the sedimentation tank main body (1).

2. The denitrification device for urban sewage treatment according to claim 1, characterized in that: The flocculant storage tank (401) is fixedly installed on the upper end face of the sedimentation tank main body (1). The guide pipe (402) is communicated with the bottom of the flocculant storage tank (401). A blanking groove (4021) is arranged at the bottom of the guide pipe (402). The top of the guiding pipe (403) is provided with a feed inlet (4031) communicated with the blanking groove (4021). The top of the guiding pipe (403) is provided with a discharge port (4032). The dosing roller (404) is installed inside the guiding pipe (403) and rotatably connected thereto. Partition plates (4049) are arranged on the surface of the dosing roller (404). A medicine storage tank (4042) is formed between the partition plates (4049). The medicine blocking cover (405) is sleeved on the outer end of the dosing roller (404) and fixedly connected thereto.

3. The denitrification device for urban sewage treatment according to claim 2, characterized in that: An isolation belt (4043) and an elastic winding roller (4046) are arranged inside the medicine storage tank (4042). One end of the isolation belt (4043) is fixedly installed on the elastic winding roller (4046). The end of the isolation belt (4043) far from the elastic winding roller (4046) is fixedly installed on the partition plate (4049).

4. The denitrification device for urban sewage treatment according to claim 3, characterized in that: The dosage adjustment component (406) includes a lifting rod (4061), a guiding column (4062) and an adjusting bolt (4063). A first chute (4041) extending axially is provided at the center of the feeding roller (404). The bottom of the medicine storage tank (4042) is connected to the first chute (4041) in a penetrating manner. The guiding column (4062) is installed in the first chute (4041) and is slidably connected to the feeding roller (404). A guiding bushing (40421) is provided inside the partition plate (4049). The guiding bushing (40421) passes through the lifting rod (4061) and is slidably connected thereto. A screw hole (4048) is provided at the bottom of the feeding roller (404). The adjusting bolt (4063) passes through the screw hole (4048) and is threadedly connected to the feeding roller (404). A guiding wheel (40611) that fits against the isolation belt (4043) is provided at the top of the lifting rod (4061). The bottom of the lifting rod (4061) is of a conical structure. The left and right sides of the guiding column (4062) are of conical structures. The top of the adjusting bolt (4063) is of a conical structure. The bottom of the lifting rod (4061) fits against the right side of the guiding column (4062). The top of the adjusting bolt (4063) fits against the left side of the guiding column (4062).

5. The denitrification device for urban sewage treatment according to claim 4, characterized in that: A vertical plate (4047) is provided in the first chute (4041). A compression spring (4064) is provided between the guiding column (4062) and the vertical plate (4047). The guiding column (4062) and the feeding roller (404) are elastically slidably connected through the compression spring (4064).

6. The denitrification device for urban sewage treatment according to claim 1, characterized in that: An inspection cover (4051) corresponding to the position of the adjusting bolt (4063) is provided on the medicine blocking cover (405). A third rotating shaft (40511) rotatably connected to the medicine blocking cover (405) is provided on the side of the inspection cover (4051). A fixing bolt (40512) for fixing is provided at the end of the inspection cover (4051) away from the third rotating shaft (40511). An inspection window (4034) is provided on the side of the guiding pipe (403).

7. The denitrification device for urban sewage treatment according to claim 1, characterized in that: The floating oil collection rack (301) is fixedly installed at the upper end of the annular steady flow plate (106). A collection tank (3011) is provided on the upper end surface of the floating oil collection rack (301). An oil discharge pipe (3012) is provided at the bottom of the collection tank (3011). The auger rod (302) is installed in the collection tank (3011) and is rotatably connected to the floating oil collection rack (301). A first rotating shaft (3031) rotatably connected to the floating oil collection rack (301) is provided on the side of the oil shoveling plate (303). The floating cylinder (3032) is fixedly installed at the bottom of the oil shoveling plate (303).

8. The denitrification device for urban sewage treatment according to claim 1, characterized in that: A second gear umbrella (2032) is provided on the central shaft tube (203). A first gear umbrella (3021) meshing with the second gear umbrella (2032) is provided on the central shaft of the auger rod (302). A second synchronous pulley (3022) is provided on the central shaft of the auger rod (302). A second rotating shaft (4044) is provided on the side of the feeding roller (404). A first synchronous pulley (4045) cooperating with the second synchronous pulley (3022) is provided on the second rotating shaft (4044). A synchronous belt (3023) for transmission is sleeved on the first synchronous pulley (4045) and the second synchronous pulley (3022).

9. A denitrification device for urban sewage treatment according to claim 1, characterized in that: A guide plate (4033) is provided at the bottom of the guide tube (403). The material guide tube (402) is of an inclined structure, and the height of the material guide tube (402) gradually decreases from the end of the flocculant storage tank (401) to the end of the central shaft tube (203).

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