A denitrification device for urban sewage treatment

Abstract

The present invention discloses a denitrification device for treating urban sewage, which relates to the technical field of sedimentation tanks. The device comprises a sedimentation tank body, a driving mechanism, an oil removal mechanism, and a flocculant dosing mechanism provided on the sedimentation tank body. A sewage inlet pipe and a sewage discharge pipe are provided at the bottom of the sedimentation tank body. An overflow plate is provided at the edge of the inner end face of the sedimentation tank body. A clean water outlet is provided on the side wall of the sedimentation tank body. An annular reflector and an annular flow stabilizing plate are provided inside the sedimentation tank body. The driving mechanism comprises a driving motor, a reducer, a central shaft tube, and a scraper. The driving motor drives the central shaft tube through the reducer, and the bottom of the central shaft tube is connected to the sewage inlet pipe. The purpose of the present invention is to provide a denitrification device for treating urban sewage, which has the advantages of simple structure, convenient maintenance, efficient oil removal, and precise dosing of flocculants, thereby solving the problems of traditional secondary sedimentation tanks, such as complex equipment, high maintenance costs, poor oil removal effect, and waste of reagents.

Description

Technical Field

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

[0002] With the acceleration of urbanization and industrial development, the amount of sewage discharged is increasing, causing serious pollution to the environment. Urban sewage treatment is an important part of environmental protection, and the denitrification process is crucial to reducing eutrophication of water bodies.

[0003] The sewage denitrification process includes pretreatment, primary sedimentation tank, biological denitrification treatment, secondary sedimentation tank, disinfection and sludge treatment. The secondary sedimentation tank is used to separate the activated sludge during secondary sedimentation. 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 poor, and the floating oil layer hinders the effective implementation of subsequent treatment steps; third, the addition of flocculants is not accurate enough, which easily leads to waste of reagents 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, efficient oil removal and precise addition of flocculants, and solves the problems of complex equipment, high maintenance cost, poor oil removal effect and waste of reagents in traditional secondary sedimentation tanks.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a denitrification device for treating urban sewage, comprising a sedimentation tank body, wherein the sedimentation tank body is provided with a driving mechanism, an oil removal mechanism and a flocculant delivery mechanism;

[0006] The bottom of the sedimentation tank body is provided with a sewage inlet pipe and a sewage discharge pipe, the inner end surface edge of the sedimentation tank body is provided with an overflow plate, the side wall of the sedimentation tank body is provided with a clean water outlet, and the sedimentation tank body is provided with an annular reflector and an annular flow stabilizing plate;

[0007] The driving mechanism includes a driving motor, a reducer, a central shaft tube and a scraper. The driving motor drives the central shaft tube through the reducer. The bottom of the central shaft tube is connected to the sewage inlet pipe. The bottom of the central shaft tube is rotatably connected to the sedimentation tank body and the sewage inlet pipe. A sewage outlet is provided at the top of the side end surface of the central shaft tube.

[0008] The oil removal mechanism includes an oil collection frame, an auger rod, an oil shovel plate and a float, and the oil removal mechanism is fixedly installed on the upper end of the annular flow stabilizing plate;

[0009] The flocculant feeding mechanism includes a flocculant storage tank, a material guide pipe, a guide pipe, a feeding roller, a drug shield and a drug dosage adjustment component. The flocculant feeding mechanism is installed above the oil removal mechanism and fixed to the sedimentation tank body.

[0010] As a preferred denitrification device for urban sewage treatment of the present invention, the flocculant storage tank is fixedly installed on the upper end surface of the sedimentation tank body, the guide pipe is connected to the bottom of the flocculant storage tank, the bottom of the guide pipe is provided with a discharge trough, the top of the guide pipe is provided with a feed port connected to the discharge trough, the bottom of the guide pipe is provided with a discharge port, the feeding roller is installed in the guide pipe and is rotatably connected to it, the surface of the feeding roller is provided with a partition, a medicine storage trough is formed between the partitions, and the medicine blocking cover is sleeved on the outer end of the feeding roller and is fixedly connected to it.

[0011] As a preferred denitrification device for urban sewage treatment of the present invention, an isolation belt and an elastic winding roller are provided 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 through a torsion spring. One end of the isolation belt is fixedly mounted on the elastic winding roller, and the end of the isolation belt away from the elastic winding roller is fixedly mounted on the partition.

[0012] As a preferred denitrification device for urban sewage treatment of the present invention, the dosage adjustment assembly includes a lifting rod, a guide column and an adjusting bolt, the center of the feeding roller is provided with a first slide groove extending in the axial direction, the bottom of the medicine storage tank is through-connected with the first slide groove, the guide column is installed in the first slide groove and is slidably connected to the feeding roller, the inner side of the partition is provided with a guide sleeve, the guide sleeve passes through the lifting rod and is slidably connected thereto, the bottom of the feeding roller is provided with a screw hole, the adjusting bolt passes through the screw hole and is threadedly connected to the feeding roller, the top of the lifting rod is provided with a guide wheel that fits with the isolation belt, the bottom of the lifting rod is a conical structure, the left and right sides of the guide column are conical structures, the top of the adjusting bolt is a conical structure, the bottom of the lifting rod fits with the right side of the guide column, and the top of the adjusting bolt fits with the left side of the guide column.

[0013] As a preferred denitrification device for urban sewage treatment of the present invention, a vertical plate is provided in the first chute, a compression spring is provided between the guide column and the vertical plate, and the guide column and the feeding roller are elastically slidably connected through the compression spring.

[0014] As a preferred denitrification device for urban sewage treatment of the present invention, the medicine shield is provided with an inspection cover corresponding to the position of the adjusting bolt, the side of the inspection cover is provided with a third rotating shaft rotatably connected to the medicine shield, the end of the inspection cover away from the third rotating shaft is provided with a fixing bolt for fixing, and the side of the guide pipe is provided with an inspection window.

[0015] As a preferred denitrification device for urban sewage treatment of the present invention, the oil floating collection rack is fixedly installed on the upper end of the annular flow stabilizing plate, the upper end face of the oil floating collection rack is provided with a collection tank, the bottom of the collection tank is provided with an oil drain pipe, the auger rod is installed in the collection tank and is rotatably connected to the oil floating collection rack, the side of the oil shoveling plate is provided with a first rotating shaft rotatably connected to the oil floating collection rack, and the float is fixedly installed on the bottom of the oil shoveling plate.

[0016] As a preferred denitrification device for urban sewage treatment of the present invention, a second toothed umbrella is provided on the central axis tube, a first toothed umbrella engaged with the second toothed umbrella is provided on the central axis of the auger rod, a second synchronous wheel is provided on the central axis of the auger rod, a second rotating shaft is provided on the side of the feeding roller, a first synchronous wheel cooperating with the second synchronous wheel is provided on the second rotating shaft, and a synchronous belt for transmission is provided on the first synchronous wheel and the second synchronous wheel.

[0017] As a preferred denitrification device for urban sewage treatment of the present invention, the float is a hollow cylindrical structure, and a water injection port is provided at the upper end of the float.

[0018] As a preferred denitrification device for urban sewage treatment of the present invention, a guide plate is provided at the bottom of the guide pipe, the guide pipe is an inclined structure, and the height of the guide pipe gradually decreases from the flocculant storage tank end to the central axis pipe end.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention adds a flocculant delivery mechanism at the upper end of the sedimentation tank body, and the partition on the feeding roller forms a medicine storage tank, which cooperates with the medicine shield to realize automatic and uninterrupted small-scale addition of flocculant, ensuring that it evenly covers the sedimentation tank water area, effectively reducing waste. The isolation belt and elastic winding roller in the medicine storage tank allow users to freely adjust the storage amount according to water quality. The medicine amount adjustment component uses structures such as adjusting bolts, guide columns and lifting rods to make the depth of the medicine storage tank change synchronously with the distance from the central axis tube, meeting the needs of uneven distribution of sediment in sewage. At the same time, the inspection cover and inspection window facilitate the operation of the adjusting bolts, and the guide pipe and guide plate ensure that the flocculant is stably discharged and can be fully mixed with the sewage, accurately control the delivery amount and delivery position, improve the flocculation effect, and solve the problems of uneven delivery, inability to adjust the delivery amount according to water quality, mismatch between the delivery amount and sewage sediment distribution, inconvenient adjustment operation, and easy waste of flocculant in traditional flocculant delivery methods.

[0021] 2. This invention incorporates an oil removal mechanism at the upper end of the sedimentation tank body. The oil collection rack, auger, and scraper plate interact in a coordinated manner. The scraper plate floats on the sewage surface, efficiently removing floating debris and directing it to a collection tank. The auger rod rapidly pushes the debris toward the oil drain pipe, significantly increasing discharge speed. The floating scraper plate accurately removes oil even when the sewage fluctuates. The buoy and water inlet design allow for flexible adjustment of the scraper plate's height, ensuring precise removal of floating oil. This solution addresses technical issues such as low surface oil removal efficiency, unstable oil removal during sewage fluctuations, the inability to flexibly adjust the scraper plate's height, and unstable power transmission within the oil removal mechanism.

[0022] 3. The present invention cleverly connects the drive motor, central shaft, oil removal mechanism, and flocculant delivery mechanism through transmission components such as the first and second gear parapets, first and second synchronous pulleys, and a synchronous belt. When the drive motor drives the central shaft to rotate, the oil removal mechanism and flocculant delivery mechanism operate synchronously. Flocculant is precisely delivered only when the scraper rotates and generates vortexes, creating the necessary conditions for oil removal. This avoids the waste of flocculant that is delivered onto floating oil and unable to mix with sediment in the sewage. This enables coordinated operation of the various mechanisms, improves sewage treatment efficiency and quality, and resolves the technical issues of asynchronous operation of the various mechanisms in sewage treatment equipment, resulting in cumbersome operation, wasted flocculant and human resources, and poor sewage treatment results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 A top view of the present invention;

[0025] Figure 3 For the present invention Figure 2 Middle AA section;

[0026] Figure 4 For the present invention Figure 2 Middle BB cross-section;

[0027] Figure 5 This is an exploded view of the flocculant delivery mechanism of the present invention;

[0028] Figure 6 It is a front cross-sectional view of the feeding roller and the guide tube in the matching state of the present invention;

[0029] Figure 7 For the present invention Figure 3 Enlarged view of point C in the middle;

[0030] Figure 8 For the present invention Figure 4 Enlarged view of point D in the middle;

[0031] Figure 9 For the present invention Figure 4 Enlarged view of point E in the middle;

[0032] Figure 10 For the present invention Figure 6 Enlarged view of point F in the middle;

[0033] Figure 11 This is a schematic structural diagram of the drug dosage adjustment component of the present invention;

[0034] Figure 12 For the present invention Figure 8 Enlarged view of point G in the middle.

[0035] Figure: 1. Settling tank body; 101. Sewage inlet pipe; 102. Annular reflector; 103. Overflow plate; 104. Clean water outlet; 105. Drain pipe; 106. Annular flow stabilizer; 2. Driving mechanism; 201. Driving motor; 202. Reducer; 203. Central axis tube; 2031. Sewage outlet; 2032. Second gear umbrella; 204. Scraper; 3. Oil removal mechanism; 301. Floating oil collection rack; 3011. Collection tank; 3012. Oil drain pipe; 302. Auger rod; 3021. First gear umbrella; 3022. Second synchronous pulley; 3023. Synchronous belt; 303. Oil scraping plate; 3031. First rotating shaft; 3032. Float; 30321. Water inlet; 4. Flocculant delivery mechanism; 401. Flocculant storage tank; 402 , material guide pipe; 4021, material discharge chute; 403, guide pipe; 4031, material feed port; 4032, material discharge port; 4033, guide plate; 4034, inspection window; 404, feeding roller; 4041, first slide chute; 4042, medicine storage trough; 40421, guide shaft sleeve; 4043, isolation belt; 4044, second rotating shaft; 4045, first synchronous wheel; 4046, elastic winding roller; 4047, vertical plate; 4048, screw hole; 4049, partition; 405, medicine shield; 4051, inspection cover; 40511, third rotating shaft; 40512, fixing bolt; 406, medicine dosage adjustment assembly; 4061, lifting rod; 40611, guide wheel; 4062, guide column; 4063, adjusting bolt; 4064, compression spring. DETAILED DESCRIPTION

[0036] Example 1

[0037] See also Figures 1-12 A denitrification device for treating urban sewage comprises a sedimentation tank body 1, on which a driving mechanism 2, an oil removal mechanism 3 and a flocculant delivery mechanism 4 are provided;

[0038] A sewage inlet pipe 101 and a sewage discharge pipe 105 are provided at the bottom of the sedimentation tank body 1, an overflow plate 103 is provided on the inner end surface edge of the sedimentation tank body 1, a clean water outlet 104 is provided on the side wall of the sedimentation tank body 1, and an annular reflector 102 and an annular flow stabilizing plate 106 are provided inside the sedimentation tank body 1;

[0039] The driving mechanism 2 includes a driving motor 201, a reducer 202, a central shaft tube 203 and a scraper 204. The driving motor 201 drives the central shaft tube 203 through the reducer 202. The bottom of the central shaft tube 203 is connected to the sewage inlet pipe 101. The bottom of the central shaft tube 203 is rotatably connected to the sedimentation tank body 1 and the sewage inlet pipe 101. A sewage outlet 2031 is provided at the top of the side end surface of the central shaft tube 203.

[0040] The oil removal mechanism 3 includes an oil collecting frame 301, an auger rod 302, an oil scraping plate 303 and a float 3032. The oil removal mechanism 3 is fixedly mounted on the upper end of the annular flow stabilizing plate 106.

[0041] The flocculant feeding mechanism 4 includes a flocculant storage tank 401, a material guide pipe 402, a guide pipe 403, a feeding roller 404, a drug shield 405 and a drug dosage adjustment assembly 406. The flocculant feeding mechanism 4 is installed above the oil removal mechanism 3 and fixed to the sedimentation tank body 1 by bolts.

[0042] Furthermore, the flocculant storage tank 401 is fixedly installed on the upper end surface of the sedimentation tank body 1, the guide pipe 402 is connected to the bottom of the flocculant storage tank 401, the bottom of the guide pipe 402 is provided with a discharge trough 4021, the top of the guide pipe 403 is provided with a feed port 4031 which is connected to the discharge trough 4021, the bottom of the guide pipe 403 is provided with a discharge port 4032, the feeding roller 404 is installed in the guide pipe 403 and is rotatably connected to it, the surface of the feeding roller 404 is provided with a partition 4049, and a medicine storage trough 4042 is formed between the partitions 4049, and the medicine shield 405 is sleeved on the outer end of the feeding roller 404 and fixedly connected to it.

[0043] The partitions 4049 form a group of two, and a medicine storage tank 4042 for storing flocculants is formed between each group of partitions 4049. The non-medicine storage area is blocked by the medicine shield 405, so that when the feeding roller 404 rotates, the medicine storage tank 4042 is located below the feed port 4031, and 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 automatic addition of flocculant. Continuous small amounts of addition can cover the entire water area of the sedimentation tank, which can effectively reduce flocculant waste.

[0044] Furthermore, 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 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 4049.

[0045] The isolation belt 4043 divides the medicine storage tank 4042 into two upper and lower areas. Only the upper end of the isolation belt 4043 can store flocculants. Therefore, the storage capacity of the medicine storage tank 4042 can be adjusted by adjusting the height of the isolation belt 4043 to change the amount of flocculant added each time the material is added. The user can freely adjust it according to the water quality.

[0046] Furthermore, the dosage adjustment assembly 406 includes a lifting rod 4061, a guide column 4062 and an adjusting bolt 4063. The center of the feeding roller 404 is provided with a first slide groove 4041 extending in the axial direction. The bottom of the medicine storage tank 4042 is connected to the first slide groove 4041. The guide column 4062 is installed in the first slide groove 4041 and is slidably connected to the feeding roller 404. The inner side of the partition 4049 is provided with a guide sleeve 40421. The guide sleeve 40421 passes through the lifting rod 4061 and is slidably connected to it. The feeding roller 404 A screw hole 4048 is provided at the bottom, and the adjusting bolt 4063 passes through the screw hole 4048 and is threadedly connected to the feeding roller 404. A guide wheel 40611 is provided on the top of the lifting rod 4061, which is in contact with the isolation belt 4043. The bottom of the lifting rod 4061 is a conical structure, and the left and right sides of the guide column 4062 are conical structures. The top of the adjusting bolt 4063 is a conical structure. The bottom of the lifting rod 4061 is in contact with the right side of the guide column 4062, and the top of the adjusting bolt 4063 is in contact with the left side of the guide column 4062.

[0047] When the feed adjustment bolt 4063 is rotated, the adjustment bolt 4063 slides upward, thereby squeezing the guide column 4062 to the right, so that the guide column 4062 squeezes each lifting rod 4061 outward synchronously, and the guide wheel 40611 on the top of the guide column 4062 lifts the isolation belt 4043, and simultaneously lowers the storage space of the medicine storage tank 4042, so that the medicine storage tank 4042 can synchronously adjust the depth according to the distance from the central axis tube 203 to meet the sewage distribution requirements. Since the central sewage has the most sediment and the edge sewage has the least sediment, it is usually necessary to adjust the depth of the medicine storage tank 4042 close to the central axis tube 203 to the maximum, and adjust the depth of the medicine storage tank 4042 away from the central axis tube 203 to a shallower depth, so that the amount of flocculant added is proportional to the amount of sediment in the sewage.

[0048] Furthermore, a vertical plate 4047 is provided in the first sliding groove 4041 , a compression spring 4064 is provided between the guide column 4062 and the vertical plate 4047 , and the guide column 4062 and the feeding roller 404 are elastically slidably connected via the compression spring 4064 .

[0049] When the adjusting bolt 4063 rotates outward, the guide column 4062 slides to the left 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.

[0050] Furthermore, an inspection cover 4051 corresponding to the position of the adjusting bolt 4063 is provided on the medicine shielding cover 405, and a third rotating shaft 40511 rotatably connected to the medicine shielding 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, and an inspection window 4034 is provided on the side of the guide tube 403.

[0051] When the inspection cover 4051 is rotated to the inspection window 4034, the fixing bolt 40512 is unscrewed, so that the inspection cover 4051 can be flipped outward along the third rotation axis 40511, thereby exposing the adjustment bolts 4063 under the inspection cover 4051, thereby making it convenient for employees to adjust each adjustment bolt 4063 and change the depth of the medicine storage tank 4042.

[0052] Furthermore, the oil floating collection rack 301 is fixedly installed on the upper end of the annular flow stabilizer 106, the upper end surface of the oil floating collection rack 301 is provided with a collection groove 3011, the bottom of the collection groove 3011 is provided with an oil drain pipe 3012, the auger rod 302 is installed in the collection groove 3011 and is rotatably connected to the oil floating collection rack 301, the side of the oil shoveling plate 303 is provided with a first rotating shaft 3031 rotatably connected to the oil floating collection rack 301, and the float 3032 is fixedly installed at the bottom of the oil shoveling plate 303.

[0053] The oil scraper plate 303 floats on the surface of the sewage, removes the floating stains on the surface of the sewage, and guides it into the collection tank 3011 under the action of water flow. The auger rod 302 rotates to push the garbage in the collection tank 3011 into the oil discharge pipe 3012, accelerating the discharge of floating garbage and improving the discharge speed. The floating oil scraper plate 303 structure enables the oil scraper plate 303 to stably remove floating oil when the sewage fluctuates, thereby improving the accuracy of surface garbage removal.

[0054] Furthermore, a second toothed umbrella 2032 is provided on the central axis tube 203, a first toothed umbrella 3021 engaged with the second toothed umbrella 2032 is provided on the central axis of the auger rod 302, a second synchronous wheel 3022 is provided on the central axis of the auger rod 302, a second rotating shaft 4044 is provided on the side of the feeding roller 404, a first synchronous wheel 4045 cooperating with the second synchronous wheel 3022 is provided on the second rotating shaft 4044, and a synchronous belt 3023 for transmission is provided on the first synchronous wheel 4045 and the second synchronous wheel 3022.

[0055] When the driving motor 201 drives the central tube to rotate, the first toothed parachute 3021 and the second toothed parachute 2032 drive the auger rod 302 to rotate, so that the oil removal mechanism 3 can discharge oil quickly and stably. At the same time, the first synchronous wheel 4045, the second synchronous wheel 3022 and the synchronous belt 3023 cooperate to drive the feeding roller 404 to rotate, so that the flocculant delivery mechanism 4 can operate and perform the flocculant delivery work. Only when the central shaft tube 203 drives the scraper 204 to rotate, the flocculant delivery mechanism 4 and the oil removal mechanism 3 can work, because the vortex generated when the scraper 204 rotates is a necessary condition for oil removal, and only when the oil removal device is running can the flocculant be accurately delivered into the sewage to avoid the flocculant being delivered onto the floating oil and unable to mix with the sediment in the sewage, resulting in flocculant waste.

[0056] Furthermore, the float 3032 is a hollow cylindrical structure, and a water inlet 30321 is provided at the upper end of the float 3032 .

[0057] By injecting a certain amount of water into the water inlet 30321 to change the density of the float 3032 and the height of the oil shoveling plate 303, the average density of the float 303 is adjusted to be between water and oil, so that the float 303 floats on the surface of the sewage and is located below the floating oil, thereby accurately removing the floating oil.

[0058] Furthermore, a guide plate 4033 is provided at the bottom of the guide pipe 403 . The guide pipe 402 is an inclined structure, and the height of the guide pipe 402 gradually decreases from the end of the flocculant storage tank 401 to the end of the central axis pipe 203 .

[0059] The gradually descending guide tube 402 structure allows the flocculant particles to evenly fill the guide tube 402, so that when the medicine storage tank 4042 is loaded, the guide tube 402 can stably and evenly discharge the material. The guide plate 4033 structure guides the flocculant to the rear side of the floating oil collection rack 301. The floating oil content on the rear side of the floating oil collection rack 301 is the lowest. At this time, the added flocculant can fully contact and mix with the sewage, effectively avoiding flocculant waste.

[0060] When the device is in use, the appropriate amount of flocculant is determined by adjusting the dosage adjustment component 406 according to the sewage quality. The specific operation is to flip the inspection cover 4051 outward along the third rotating shaft 40511, unscrew the fixing bolt 40512, open the inspection cover 4051 corresponding to the position of the adjustment bolt 4063 on the medicine shield 405, and use a tool to rotate the adjustment bolt 4063. When the adjustment bolt 4063 is rotated upward, it will squeeze the guide column 4062, and the guide column 4062 will then squeeze each lifting rod 4061 outward synchronously, and the lifting rod 406 The guide wheel 40611 at the top will lift the isolation belt 4043 and simultaneously reduce the storage space of the medicine storage tank 4042. Conversely, when the adjusting bolt 4063 is rotated outward, the guide column 4062 slides to the left under the reset action of the compression spring 4064, and the isolation belt 4043 is tightened under the action of the elastic winding roller 4046. The lifting rod 4061 slides downward under the tension of the isolation belt 4043, increasing the storage space of the medicine storage tank 4042. The storage space of the medicine storage tank 4042 is adjusted to gradually increase from the edge of the sedimentation tank to the center, and the driving motor 201 When the feeding roller 404 is rotated, the central shaft tube 203 is driven to rotate. The rotation of the central shaft tube 203 drives 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 discharge trough 4021 of the guide tube 402, the flocculant in the flocculant storage tank 401 flows into the medicine storage tank 4042 through the guide tube 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 tube 403, the flocculant is discharged. The flocculant is discharged from the discharge port 4032 and evenly distributed into the sewage in the sedimentation tank body 1. The guide plate 4033 at the bottom of the guide tube 403 guides the flocculant toward the rear side of the floating oil collection rack 301 so that the flocculant can fully contact and mix with the sewage. The second toothed parapet 2032 on the central axis tube 203 engages with the first toothed parapet 3021 on the central axis of the auger rod 302, driving the auger rod 302 to rotate. The oil scraping plate 303 floats on the surface of the sewage and, under the action of the water flow, removes floating stains on the surface of the sewage and guides them into the collection groove 3011 on the upper end face of the floating oil collection rack 301.The auger rod 302 rotates in the collection tank 3011, pushing the garbage in the collection tank 3011 to the oil discharge pipe 3012 to achieve rapid oil discharge. Since the oil shovel plate 303 is a floating structure, it can stably remove the floating oil even if the sewage fluctuates. The bottom of the central shaft pipe 203 is connected to the sewage inlet pipe 101. The sewage enters the central shaft pipe 203 from the sewage inlet pipe 101 and is discharged into the sedimentation tank body 1 from the sewage outlet 2031 on the top of the side end face of the central shaft pipe 203. When the scraper 204 is connected to the central shaft pipe 203 and rotates to generate a vortex Under this environment, the oil removal mechanism 3 can effectively remove the floating oil on the surface of the sewage. At this time, the flocculant released by the flocculant release mechanism 4 can be accurately released into the sewage and fully mixed with the activated sludge in the sewage to avoid waste caused by the flocculant being released onto the floating oil. After the sewage is flocculated and precipitated in the sedimentation tank body 1, the clean water flows out through the clean water outlet 104 on the side wall of the sedimentation tank body 1. The activated sludge and other impurities precipitated at the bottom of the sedimentation tank body 1 can be discharged regularly through the sewage pipe 105, and the sewage inlet pipe 101 continuously inlets water to ensure the continuity of the sewage treatment process.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A denitrification device for treating urban sewage, comprising a sedimentation tank body (1), characterized in that: The sedimentation tank body (1) is provided with a driving mechanism (2), an oil removal mechanism (3) and a flocculant delivery mechanism (4); A sewage inlet pipe (101) and a sewage outlet pipe (105) are provided at the bottom of the sedimentation tank body (1); an overflow plate (103) is provided at the edge of the inner end surface of the sedimentation tank body (1); a clean water outlet (104) is provided on the side wall of the sedimentation tank body (1); and an annular reflector (102) and an annular flow stabilizing plate (106) are provided inside the sedimentation tank body (1); The driving mechanism (2) comprises a driving motor (201), a reducer (202), a central shaft tube (203), and a scraper (204); the driving motor (201) drives the central shaft tube (203) via the reducer (202); the bottom of the central shaft tube (203) is connected to the sewage inlet pipe (101); and a sewage outlet (2031) is provided at the top of the side end surface of the central shaft tube (203); The oil removal mechanism (3) comprises an oil collecting frame (301), an auger rod (302), an oil scraping plate (303) and a float (3032), and the oil removal mechanism (3) is fixedly mounted on the upper end of the annular flow stabilizing plate (106); The flocculant delivery mechanism (4) comprises a flocculant storage tank (401), a material guide pipe (402), a guide pipe (403), a feeding roller (404), a drug shield (405) and a drug dosage adjustment component (406); the flocculant delivery mechanism (4) is installed above the oil removal mechanism (3) and fixed to the sedimentation tank body (1); The flocculant storage tank (401) is fixedly mounted on the upper end surface of the sedimentation tank body (1); the guide pipe (402) is connected to the bottom of the flocculant storage tank (401); a feed trough (4021) is provided at the bottom of the guide pipe (402); a feed port (4031) connected to the feed trough (4021) is provided at the top of the guide pipe (403); a discharge port (4032) is provided at the bottom of the guide pipe (403); the feeding roller (404) is mounted in the guide pipe (403) and is rotatably connected thereto; a partition (4049) is provided on the surface of the feeding roller (404); a medicine storage trough (4042) is formed between the partitions (4049); and the medicine shield (405) is sleeved on the outer end of the feeding roller (404) and is fixedly connected thereto; An isolation belt (4043) and an elastic winding roller (4046) are provided in the medicine storage tank (4042); one end of the isolation belt (4043) is fixedly mounted on the elastic winding roller (4046); and the end of the isolation belt (4043) away from the elastic winding roller (4046) is fixedly mounted on a partition (4049); The drug dosage adjustment assembly (406) includes a lifting rod (4061), a guide column (4062) and an adjustment bolt (4063); a first chute (4041) extending in the axial direction is provided at the center of the feeding roller (404); the bottom of the drug storage tank (4042) is connected to the first chute (4041); the guide column (4062) is installed in the first chute (4041) and is slidably connected to the feeding roller (404); a guide sleeve (40421) is provided on the inner side of the partition (4049); the guide sleeve (40421) passes through the lifting rod (4061) and is slidably connected thereto; the feeding roller (404) A screw hole (4048) is provided at the bottom, and the adjusting bolt (4063) passes through the screw hole (4048) and is threadedly connected to the feeding roller (404). A guide wheel (40611) is provided at the top of the lifting rod (4061) and is in contact with the isolation belt (4043). The bottom of the lifting rod (4061) is a conical structure, and the left and right sides of the guide column (4062) are conical structures. The top of the adjusting bolt (4063) is a conical structure. The bottom of the lifting rod (4061) is in contact with the right side of the guide column (4062), and the top of the adjusting bolt (4063) is in contact with the left side of the guide column (4062).

2. A denitrification device for treating urban sewage according to claim 1, characterized in that: A vertical plate (4047) is provided in the first chute (4041), a compression spring (4064) is provided between the guide column (4062) and the vertical plate (4047), and the guide column (4062) and the feeding roller (404) are elastically slidably connected via the compression spring (4064).

3. A denitrification device for treating urban sewage according to claim 1, characterized in that: The drug shield (405) is provided with an inspection cover (4051) corresponding to the position of the adjustment bolt (4063), a third rotating shaft (40511) rotatably connected to the drug shield (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), and an inspection window (4034) is provided on the side of the guide tube (403).

4. A denitrification device for treating urban sewage according to claim 1, characterized in that: The oil floating collection frame (301) is fixedly mounted on the upper end of the annular flow stabilizing plate (106); a collection trough (3011) is provided on the upper end surface of the oil floating collection frame (301); an oil drain pipe (3012) is provided at the bottom of the collection trough (3011); the auger rod (302) is mounted in the collection trough (3011) and is rotatably connected to the oil floating collection frame (301); a first rotating shaft (3031) rotatably connected to the oil floating collection frame (301) is provided on the side of the oil shoveling plate (303); and the float (3032) is fixedly mounted on the bottom of the oil shoveling plate (303).

5. A denitrification device for treating urban sewage according to claim 1, characterized in that: A second toothed parachute (2032) is provided on the central shaft tube (203), a first toothed parachute (3021) meshing with the second toothed parachute (2032) is provided on the central shaft of the auger rod (302), a second synchronous wheel (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 wheel (4045) cooperating with the second synchronous wheel (3022) is provided on the second rotating shaft (4044), and a synchronous belt (3023) for transmission is sleeved on the first synchronous wheel (4045) and the second synchronous wheel (3022).

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

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