Sewage treatment equipment

Abstract

The invention discloses sewage treatment equipment which comprises a grit chamber, an aeration tank, a defoaming tank, a sedimentation tank and a multi-medium filter, the grit chamber is connected with the aeration tank through a first pipeline, the aeration tank is connected with the defoaming tank through a second pipeline, the defoaming tank is connected with the sedimentation tank through a third pipeline, and the sedimentation tank is connected with the multi-medium filter through a fourth pipeline. Sewage is sequentially treated through the grit chamber, the aeration tank, the defoaming tank, the sedimentation tank and the multi-medium filter, silt in the sewage can be firstly settled and filtered, then the sewage is oxygenated through the aeration tank, the metabolic capability and activity of microorganisms are improved, decomposition of organic matters is accelerated, and the sewage treatment effect is improved. Foams are fished through the defoaming tank to reduce the content of organic matters in the treatment system, sewage is further clarified, filtered and purified through the sedimentation tank and the multi-medium filter, the obtained water is highly purified, the purification effect is good, the sewage treatment cost is low, and the sewage treatment speed is high.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment equipment, and particularly to a sewage treatment equipment. Background Art

[0002] At present, the sewage treatment methods mainly include the following: physical treatment method, chemical treatment method, biological treatment method. Among them, the physical treatment method includes: filtration method, sedimentation method, flotation method. The filtration method uses a filtration medium to intercept suspended solids in sewage. Commonly used equipment includes grids, screens and microfiltration machines. The sedimentation method uses the different relative densities of suspended solids and water in sewage to separate the suspended solids from the water through gravity sedimentation. The flotation method uses the buoyancy of bubbles to make pollutants such as emulsified oil and tiny suspended solids in sewage adhere to the bubbles, and then separates impurities and purifies sewage by collecting the foam or scum on the water surface; the chemical treatment method includes coagulation, chemical precipitation, neutralization, oxidation-reduction, electrolysis. Coagulation makes the suspended solids and colloidal particles in sewage aggregate into larger particles through chemical reactions, which is convenient for sedimentation and removal. Chemical precipitation converts certain substances in sewage into precipitates insoluble in water through chemical reactions. Neutralization adjusts the pH value of sewage through chemical reactions to make it neutral or close to neutral. Oxidation-reduction changes certain components in sewage through chemical reactions, such as oxidizing certain substances into harmless or low-toxic substances. Electrolysis decomposes certain substances in sewage through electrolysis; the biological treatment method includes aerobic biological treatment, anaerobic biological treatment, biofilm method, activated sludge method, A / O process method. Aerobic biological treatment uses the oxidative decomposition of aerobic microorganisms to convert organic matter in sewage into carbon dioxide and water. Anaerobic biological treatment uses the metabolic process of anaerobic microorganisms to convert organic matter in sewage into methane and carbon dioxide. The biofilm method uses the microbial film fixed on the surface of the carrier to purify organic matter. The activated sludge method decomposes organic matter through the activated sludge in the aeration tank. The A / O process method combines anaerobic and aerobic processes to remove organic pollutants, nitrogen and phosphorus at the same time. These methods can be selected and combined according to specific sewage treatment requirements and conditions to achieve the best treatment effect.

[0003] However, the controllability of each link of the existing sewage treatment technology is weak. It is necessary for the water quality to have good conditions to achieve a better treatment effect. The treatment effect is not good, and long-term aeration and oxygen supply are required. It has the problems of complex system management, high operation cost, low sewage treatment efficiency, and weak process controllability. Summary of the Invention

[0004] The present invention provides a sewage treatment equipment, which solves the problems of complex system management, high operation cost, low sewage treatment efficiency, and weak process controllability existing in the traditional sewage treatment equipment.

[0005] The present invention provides a sewage treatment device, including a grit chamber, an aeration tank, a defoaming tank, a sedimentation tank, and a multi-media filter. The grit chamber is connected to the aeration tank through a first pipeline, the aeration tank is connected to the defoaming tank through a second pipeline, the defoaming tank is connected to the sedimentation tank through a third pipeline, and the sedimentation tank is connected to the multi-media filter through a fourth pipeline.

[0006] In the above technical solution, further, a water inlet pipe is arranged at the front end of the grit chamber, and a drain pipe is arranged at the rear end. A plurality of sand discharge ports are sequentially arranged from front to back at the bottom inside the grit chamber. A sand collecting cylinder is arranged below each sand discharge port. The lower ends of each sand collecting cylinder are respectively connected to a sand discharge pipe, and the sand discharge pipe is connected to a lifting pipe. A first screw conveyor mechanism is arranged in both the sand discharge pipe and the lifting pipe. A vertical baffle plate is arranged at the front end of the grit chamber, and a screw lifting structure is correspondingly arranged in each sand discharge port at the rear side of the baffle plate.

[0007] In the above technical solution, further, the screw lifting structure includes an inner cylinder, an outer cylinder, a support rod, and a first motor. The upper end of the outer cylinder is fixedly connected to the top of the grit chamber. The inner cylinder is coaxially arranged inside the outer cylinder, and the lower end part of the inner cylinder extends out of the outer cylinder. A spiral blade is arranged on the side wall of the inner cylinder inside the outer cylinder. A first motor is arranged on the top of the grit chamber. The output shaft part of the first motor extends into the upper end inside the inner cylinder and is fixedly connected to the inner wall of the inner cylinder through a support rod.

[0008] In the above technical solution, further, a column is arranged on the side wall of the aeration tank. A cantilever beam is arranged at the upper end of the column. One end of the cantilever beam is fixedly connected to the column, and the other end is suspended above the aeration tank. A fixed pulley is arranged at the suspended end of the cantilever beam. A steel wire rope is arranged on the fixed pulley. One end of the steel wire rope is connected to a winch arranged on the cantilever beam, and the other end is connected to an aeration structure arranged inside the aeration tank.

[0009] In the above technical solution, further, the aeration structure includes a fixed rod, a mounting plate, an aeration pipe, a gas spray head, a gas supply pipe, a guide rod, and a spray pipe. A fixed rod is arranged on the top of the mounting plate, and the fixed rod is fixedly connected to the steel wire rope. A plurality of vertical aeration pipes are arranged in an array at the bottom of the mounting plate. The upper end of each aeration pipe is fixedly connected to the mounting plate. A plurality of gas jet ports are arranged on the side wall of each aeration pipe along the circumferential direction. Each gas jet port is connected to a gas spray head. A gas supply pipe is arranged on the mounting plate, and the gas supply pipe is respectively connected to the upper ends of each aeration pipe. The gas supply pipe is connected to an air pump through a gas pipe joint for air supply. A plurality of vertical guide rods are arranged at the bottom of the aeration tank. The upper end of each guide rod is vertically and slidably matched in a corresponding guide hole arranged on the mounting plate. An annular spray pipe is arranged at the upper end of each aeration pipe. A plurality of nozzles are arranged at the bottom of the spray pipe. The spray pipe is connected to a water pump through a water supply pipe.

[0010] In the above technical solution, further, a foam drainage pipe is arranged in the foam removal tank, a foam drainage hole is arranged on one side wall of the foam removal tank, the foam drainage hole is communicated with one end of the foam drainage pipe, a collection box is arranged on the outer side wall of the foam removal tank, two first gears are arranged at both ends of the foam drainage pipe, a plurality of positioning shafts are arranged along the circumferential direction in the central hole of each first gear, each positioning shaft is connected with the side wall of the foam removal tank, a collection port is arranged at the top of the foam drainage pipe, a plurality of horizontal support pipes are arranged between the two first gears, both ends of each support pipe are fixedly connected with the side walls of the two first gears respectively, a foam collection plate is arranged on each support pipe, a plurality of annular grooves are arranged along the axial direction on the side wall of the foam drainage pipe, a guide plate connected with the foam collection plate is arranged in each annular groove, two baffles are arranged at both ends of the foam collection plate, and a second gear capable of meshing and driving with the first gear is arranged on one side of one of the first gears, and a first driving mechanism for driving the second gear to rotate is arranged on the side wall of the foam removal tank on the side of the second gear.

[0011] In the above technical solution, further, a plurality of annular weir plates are concentrically arranged in the sedimentation tank, the height of each annular weir plate gradually decreases from the middle to the periphery, a support plate is arranged at the top of the annular weir plate in the middle of the sedimentation tank, a bearing seat is arranged on the support plate, a rotating shaft is rotatably arranged on the bearing seat, a second driving mechanism for driving the rotating shaft to rotate is arranged on one side of the rotating shaft, a rotating plate is arranged at the upper end of the rotating shaft, a plurality of connecting rods are arranged at the bottom of the rotating plate, and a impurity removal scraping plate is arranged at the lower end of each connecting rod.

[0012] In the above technical solution, further, the multi-media filter includes a filter tank, filter plates, and filter media. A plurality of filter plates are sequentially arranged in the filter tank, filter media are arranged between adjacent two filter plates, a liquid inlet is arranged on the side wall at the lower end of the filter tank and connected with a liquid inlet pipe, the liquid inlet pipe is connected with a fourth pipeline through a booster pump, a liquid outlet pipe is arranged and connected on the side wall at the top of the filter tank, and the liquid outlet pipe is connected with a liquid drainage tank arranged at the top inside the filter tank.

[0013] From the above technical solutions, the present invention provides a sewage treatment device. Compared with the prior art, the beneficial effects of the present invention are as follows: By sequentially treating sewage through a grit chamber, an aeration tank, a foam removal tank, a sedimentation tank, and a multi-media filter, the present invention can first precipitate and filter the dirty sediment in the sewage, then aerate the sewage through the aeration tank to increase the metabolic capacity and activity of microorganisms, accelerate the decomposition of organic matter, reduce the organic matter content in the treatment system by fishing for foam through the foam removal tank, and further clarify and purify the sewage through the sedimentation tank and the multi-media filter. The obtained water quality has a high purification degree, good purification effect, low operating cost of the sewage treatment device, and high sewage treatment efficiency. Description of the Drawings

[0014] To more clearly illustrate the technical solution of the present invention, the accompanying drawings required in the implementation cases will be briefly introduced below. Obviously, for those of ordinary skill in the art, other accompanying drawings can also be obtained based on these drawings without creative efforts.

[0015] Figure 1 Schematic diagram of the overall structure of a sewage treatment device proposed by the present invention; Figure 2 Schematic cross-sectional view of the grit chamber structure of a sewage treatment device proposed by the present invention; Figure 3 For the attachment of the present invention Figure 2 Schematic diagram of the partial enlarged structure at position I; Figure 4 Schematic diagram of the aeration tank structure of a sewage treatment device proposed by the present invention; Figure 5 Schematic diagram of the internal structure of the foam removal tank of a sewage treatment device proposed by the present invention; Figure 6 Schematic diagram of a partial structure of the foam removal tank of a sewage treatment device proposed by the present invention; Figure 7 Schematic diagram of the sedimentation tank structure of a sewage treatment device proposed by the present invention; Figure 8 Schematic diagram of the installation position of the second driving mechanism of a sewage treatment device proposed by the present invention; Figure 9 Schematic diagram of the internal structure of a multi-media filter of a sewage treatment device proposed by the present invention.

[0016] In the figure: 1 - grit chamber; 11 - inlet pipe; 12 - drain pipe; 13 - sand collection cylinder; 14 - sand discharge pipe; 15 - sand discharge port; 16 - lifting pipe; 17 - first screw conveyor; 18 - sand baffle; 19 - screw lifting structure; 191 - inner cylinder; 192 - outer cylinder; 193 - support rod; 194 - first motor; 1911 - spiral blade; 2 - aeration tank; 21 - column; 22 - cantilever beam; 23 - fixed pulley; 24 - steel wire rope; 25 - winch; 26 - aeration structure; 261 - fixed rod; 262 - mounting plate; 263 - aeration pipe; 264 - gas spray head; 265 - air supply pipe; 266 - guide rod; 267 - spray pipe; 3 - Demisting tank; 30 - Mist discharge hole; 31 - Mist discharge pipe; 32 - First gear; 33 - Support pipe; 34 - Foam collection plate; 35 - Second gear; 36 - Collection box; 37 - First drive mechanism; 310 - Collection port; 321 - Positioning shaft; 342 - Baffle; 311 - Annular groove; 341 - Guide plate; 371 - First motor; 372 - First reducer; 373 - Half shaft; 374 - Motor mounting seat; 4 - Sedimentation tank; 41 - Annular weir plate; 42 - Support plate; 43 - Bearing seat; 44 - Rotating shaft; 45 - Rotating plate; 46 - Connecting rod; 47 - Impurity removal scraper; 48 - Second drive mechanism; 481 - Second motor; 482 - First pulley; 483 - Second pulley; 484 - Transmission belt; 5 - Multimedia filter; 51 - Filter tank; 52 - Filter plate; 53 - Filter medium; 54 - Drainage tank; 511 - Liquid inlet; 512 - Liquid outlet; 101 - First pipeline; 102 - Second pipeline; 103 - Third pipeline; 104 - Fourth pipeline. Detailed implementation manners

[0017] In order to enable those skilled in the art of the present technology to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings.

[0018] Embodiment 1: See Figures 1-9, A sewage treatment device, including a grit chamber 1, an aeration tank 2, a defoaming tank 3, a sedimentation tank 4, and a multi-media filter 5 installed on the ground. The grit chamber 1 is connected to the aeration tank through a first pipeline 101, the aeration tank 2 is connected to the defoaming tank 3 through a second pipeline 102, the defoaming tank 3 is connected to the sedimentation tank 4 through a third pipeline 103, and the sedimentation tank 4 is connected to the multi-media filter 5 through a fourth pipeline 104. The sediment in the sewage is settled in the grit chamber 1 and separated from the sewage. The sewage is aerated in the aeration tank 2 to increase the metabolic capacity and activity of microorganisms, accelerate the decomposition of organic matter, and enhance the contact and reaction of the substrate by the generated flow force, which can remove substances such as erosive dissolved oxygen, ammonia nitrogen, nitrate nitrogen, sulfide, organic nitrogen, and organic phosphorus, reduce the pollutant concentration, improve the water quality of the sewage treatment system, help maintain the healthy state of the biological community in the biological filter, and promote the growth of beneficial bacteria and the biodegradation process. The defoaming tank 3 can reduce the organic matter content in the treatment system by fishing for foam, thereby improving the treatment effect. The quantity and properties of the foam can reflect the state of the activated sludge. Excessive foam may be a manifestation of sludge poisoning or an indication of changes in certain factors in the treatment environment. By observing the properties of the foam (such as color, texture, etc.), the operator can adjust various parameters of the treatment process (such as oxygen supply, nutrient ratio, etc.) to optimize the sewage treatment effect. Through the sedimentation tank 4, the impurities that were not completely removed in the primary sedimentation tank can be removed. The sedimentation tank 4 is mainly used to remove suspended solids and a part of the organic matter in a suspended state in the sewage, reducing the organic load on the subsequent biological treatment structures. In the secondary sedimentation tank (final sedimentation tank), other chemical agents such as flocculants are added to the sedimentation tank to further remove the active substances in the biologically treated effluent and ensure the effluent water quality. The multi-media filter 5 is used to remove impurities such as suspended solids, particulate matter, and colloids in the water to purify the water quality. After the sewage is sequentially treated by the grit chamber 1, the aeration tank 2, the defoaming tank 3, the sedimentation tank 4, and the multi-media filter 5, the water quality is highly purified, the purification effect is good, the sewage treatment cost is low, and the sewage treatment speed is fast.

[0019] In this embodiment, referring to Figure 2 , at the front end of the grit chamber 1, a water inlet pipe 11 is provided, and at the rear end, a drain pipe 12 is provided. At the bottom of the grit chamber 1, three sand discharge ports 15 are sequentially arranged from front to back. Below each sand discharge port 15, a sand collecting cylinder 13 is provided. The sand collecting cylinder 13 is a funnel-shaped structure with a larger upper part and a smaller lower part. The lower ends of each sand collecting cylinder 13 are respectively connected to a sand discharge pipe 14, and the sand discharge pipe 14 is connected to a lifting pipe 16. A first screw conveyor mechanism 17 is arranged in both the sand discharge pipe 14 and the lifting pipe 16. A vertical sand baffle 18 is provided at the front end of the grit chamber 1, and a screw lifting structure 19 is correspondingly arranged in each sand discharge port 15 behind the sand baffle 18. The function of the grit chamber 1 is to separate the denser inorganic particles from the sewage, protect the water pump and pipeline from abrasion, reduce the volume of the sludge treatment structure, and increase the content rate of the organic components in the sludge.

[0020] In this embodiment, referring to Figure 2 and 3 , the spiral lifting structure 19 includes an inner cylinder 191, an outer cylinder 192, a support rod 193, and a first motor 194. The upper end of the outer cylinder 192 is fixedly connected to the top of the grit chamber 1. The inner cylinder 191 is coaxially arranged inside the outer cylinder 192. The lower end portion of the inner cylinder 191 extends out of the outer cylinder 192. A spiral blade 1911 is arranged on the side wall of the inner cylinder 191 inside the outer cylinder 192. The first motor 194 is arranged on the top of the grit chamber 1. The output shaft of the first motor 194 partially extends into the upper end inside the inner cylinder 191 and is fixedly connected to the inner wall of the inner cylinder 191 through the support rod 193.

[0021] In this embodiment, referring to Figure 4 , columns 21 are arranged on the side wall of the aeration tank 2. A cantilever beam 22 is arranged at the upper end of the column 21. One end of the cantilever beam 22 is fixedly connected to the column 21, and the other end is suspended above the aeration tank 2. A fixed pulley 23 is arranged at the suspended end of the cantilever beam 22. A steel wire rope 24 is arranged on the fixed pulley 23. One end of the steel wire rope 24 is connected to a winch 25 arranged on the cantilever beam 22, and the other end is connected to an aeration structure 26 arranged in the aeration tank 2. The aeration structure 26 introduces air into the sewage to generate tiny bubbles as carriers, so that pollutants such as emulsified oil and tiny suspended solids in the sewage adhere to the bubbles. The aeration structure 26 is controlled by the winch 25 to enter the sewage for aeration. By using the floating effect of the bubbles, the suspended solids float to the water surface, and the impurities are separated and the sewage is purified by collecting the foam or scum on the water surface.

[0022] In this embodiment, referring to Figure 4, the aeration structure 26 includes a fixed rod 261, a mounting plate 262, an aeration pipe 263, a gas nozzle 264, an air supply pipe 265, a guide rod 266, and a spray pipe 267. The mounting plate 262 is rectangular parallelepiped-shaped, and the aeration tank 2 is rectangular parallelepiped-shaped with an open upper end. The size of the mounting plate 262 is slightly smaller than the size of the opening of the aeration tank 2, so that the mounting plate 262 can smoothly enter the aeration tank 2 during the up and down movement, and each aeration pipe 263 is inserted into the aeration tank 2. A vertical fixed rod 261 is provided at the top of the mounting plate 262, and the upper end of the fixed rod 261 is fixedly connected to the steel wire rope 24. A plurality of vertical aeration pipes 263 are arranged in an array at the bottom of the mounting plate 262, and the upper end of each aeration pipe 263 is fixedly connected to the mounting plate 262. A plurality of jet ports are arranged in an array along the circumferential direction and the axial direction on the side wall of each aeration pipe 263, and each jet port is connected to a gas nozzle 264. An air supply pipe 265 is arranged on the upper surface of the mounting plate 262, and the air supply pipe 265 is respectively connected to the upper ends of the aeration pipes 263. The air supply pipe 265 is connected to an air pump through a gas pipe joint for air supply. A plurality of vertical guide rods 266 are arranged at the bottom of the aeration tank 2, and the upper end of each guide rod 266 is vertically and slidably fitted in a corresponding guide hole provided on the mounting plate 262. An annular spray pipe 267 is provided at the upper end of each aeration pipe 263, and the annular spray pipe 267 is sleeved on the outer wall of the upper end of the aeration pipe 263. A plurality of nozzles connected and communicated with the spray pipe 267 are arranged along the circumferential direction at the bottom of the spray pipe 267, and the nozzles are arranged downward. The spray pipe 267 is connected to a water pump through a water supply pipe, and the cleaning liquid is supplied into the spray pipe 267 through the water pump. The cleaning liquid is distributed into an annular shape through the spray pipe 267 and is sprayed downward in an annular shape from the upper end of the aeration pipe 263 to wash and clean the aeration pipe 263 and the gas nozzles 264 on the aeration pipe, prevent bacteria from growing on the aeration pipe 263 and the gas nozzles 264, prevent the gas nozzles 264 from being blocked, increase the stability of aeration, and have good aeration uniformity.

[0023] In this embodiment, refer to Figure 5 , 6, a foam drainage pipe 31 is horizontally arranged inside the rear end of the foam removal tank 3. Both ends of the foam drainage pipe 31 are fixedly connected to the side walls on both sides of the foam removal tank 3. The foam removal tank 3 is a cuboid-shaped tank with an open upper end. A foam drainage hole 30 is arranged on one side wall of the foam removal tank 3. The foam drainage hole 30 is connected and communicated with one end of the foam drainage pipe 31. A collection box 36 is arranged on the outer side wall of the foam removal tank 3. The collection box 36 is located below the foam drainage hole 30 and is used to receive the floating foam discharged from the foam drainage hole 30. Two first gears 32 are rotatably arranged at both ends of the foam drainage pipe 31. The two first gears 32 are annular gears. The two first gears 32 are sleeved on both ends of the foam drainage pipe 31 through their central holes. Three horizontal positioning shafts 321 are arranged along the circumferential direction in the central hole of each first gear 32. The three positioning shafts 321 are all vertically and fixedly connected to the side wall of the foam removal tank 3. The three positioning shafts 321 rotatably position and support the first gear 32 in the vertical direction. A through collection port 310 is arranged along the axial direction on the top side wall of the foam drainage pipe 31. Three horizontal support pipes 33 are evenly arranged along the circumferential direction between the two first gears 32. Both ends of each support pipe 33 are fixedly connected to the side walls of the two first gears 32. A foam collection plate 34 is fixedly arranged on each support pipe 33. Each foam collection plate 34 is an arc-shaped plate with the arc surface facing upwards and is used for fishing the floating foam. The inner end of each foam collection plate 34 abuts against the cylindrical side wall of the foam drainage pipe 31, and the outer end is distributed along the radial direction of the foam drainage pipe 31 and is suspended. Six annular grooves 311 are arranged along the axial direction on the side wall of the foam drainage pipe 31. Six guide plates 341 are fixedly connected to the inner side edge of the foam collection plate 34. Each foam collection plate 34 is integrally connected with the guide plate 341, and both are made of hard rubber plates. The six guide plates 341 are respectively inserted into the six annular grooves 311. The inner wall of each guide plate 341 abuts against the inner wall of the corresponding annular groove 311 to prevent the foam from flowing out through the gap. Two baffles 342 are fixedly arranged at both ends of the foam collection plate 34 to prevent the foam from flowing out from both ends and can concentrate the floating foam and guide it into the foam drainage pipe 31 through the collection port. A second gear 35 that can be meshed and driven with the first gear 32 is arranged on one side of one of the first gears 32. A first driving mechanism 37 for driving the second gear 35 to rotate is arranged on the side wall of the foam removal tank 3 on the side of the second gear 35. The first driving mechanism 37 includes a first motor 371, a first reducer 372, a half shaft 373, and a motor mounting seat 374. The motor mounting seat 374 is fixed on the side wall of the foam removal tank 3. The first motor 371 and the first reducer 372 are fixedly installed on the motor mounting seat 374. The first motor 371 is connected to the input end of the first reducer 372. The output end of the first reducer 372 is connected to the half shaft 373. The second gear 35 is coaxially and fixedly arranged on the half shaft 373. The second gear 35 is in gear transmission cooperation with the first gear 32. By driving the first reducer 372 with the first motor 371, the first gear 32 and the second gear 35 are engaged and driven, driving the foam collection plate 34 on the support pipe 33 to fish the floating foam in the foam removal tank 3.And when the foam collection plate 34 rotates above the foam discharge pipe 31, the floating foam is poured into the foam discharge pipe 31 from the collection port, and the efficiency of salvaging and removing foam is high.

[0024] In this embodiment, referring to Figure 7 , 8 , a plurality of annular weir plates 41 are concentrically arranged in the sedimentation tank 4 from the inside to the outside. For each annular weir plate 41, the height gradually decreases from the middle to the periphery. A horizontal support plate 42 is arranged at the top of the annular weir plate 41 in the middle of the sedimentation tank 4. A bearing seat 43 is arranged on the support plate 42. The bearing seat 43 is located at the central position of the sedimentation tank 4. A vertical rotating shaft 44 is rotatably arranged on the bearing seat 43. A second driving mechanism 48 for driving the rotation of the rotating shaft 44 is arranged on one side of the rotating shaft 44. The second driving mechanism 48 includes a second motor 481, a first pulley 482, a second pulley 483, and a transmission belt 484. The second motor 481 is fixedly arranged on the support plate 42. A first pulley 482 is coaxially and fixedly arranged on the output shaft of the second motor 481. A second pulley 483 is coaxially and fixedly arranged on the rotating shaft 44. The first pulley 482 and the second pulley 483 are connected by the transmission belt 484. Of course, the rotating shaft 44 can also be driven to rotate by means of chain drive. A horizontal rotating plate 45 is arranged at the upper end of the rotating shaft 44. One end of the rotating plate 45 is fixedly connected to the rotating shaft 44, and the other end is suspended above the sedimentation tank 4 and can make a circular motion with the rotating shaft 44 as the center. A plurality of vertical connecting rods 46 are fixedly arranged at the bottom of the rotating plate 45. An impurity scraping plate 47 is arranged at the lower end of each connecting rod 46. Each impurity scraping plate 47 is arranged between two corresponding annular weir plates 41 and is used for scraping and cleaning the sediment at the bottom between the annular weir plates 41. The sewage is introduced into the annular weir plate 41 in the middle of the sedimentation tank 4 and flows in a divergent manner from the middle to the periphery. Through the annular weir plates 41, the impurities in the sewage are successively intercepted between the annular weir plates 41, and the sewage is sedimented and filtered.

[0025] In this embodiment, referring to Figure 9, the multi-media filter 5 includes a filter tank 51, filter plates 52, and filter media 53. A plurality of filter plates 52 are sequentially arranged in the filter tank 51 from top to bottom. A layer of ultrafiltration membrane is fixedly installed on the topmost filter plate 52. The ultrafiltration membrane can intercept passing bacteria and most viruses, further purifying the water quality. Filter media 53 are fixedly arranged between two adjacent filter plates 52. A liquid inlet is provided on the side wall at the lower end of the filter tank 51 and is connected to a liquid inlet pipe 511. The liquid inlet pipe 511 is connected to the fourth pipeline 104 through a booster pump. The sewage in the sedimentation tank 4 is pumped into the filter tank 51 through the booster pump. An outlet pipe 512 is provided and connected to the side wall at the top of the filter tank 51. The outlet pipe 512 is connected to a drain tank 54 provided at the top inside the filter tank 51. a is cobblestone, b is activated carbon, and c is quartz sand. The quartz sand and cobblestones are restricted in a fixed area by the filter plates 52 to prevent movement. The sewage is introduced from the liquid inlet pipe 511 at the bottom of the filter tank 51 of the multi-media filter 5, and then the sewage is filtered successively by the cobblestone a, activated carbon b, and quartz sand c, enters the drain tank 54, and is discharged from the outlet pipe 512. The filtering effect is good and the filtering efficiency is high. When the multi-media filter 5 needs to be cleaned, the cleaning liquid is supplied from the outlet pipe 512, so that the cleaning liquid enters the filter tank 51 and is discharged from the liquid inlet pipe 511 to perform reverse cleaning on the multi-media.

[0026] In this embodiment, the outlet position of the grit chamber 1 is higher than the highest liquid level position that the aeration tank 2 can accommodate. The sewage in the grit chamber 1 can automatically flow into the aeration tank 2, or the supernatant in the grit chamber 1 can be pumped into the aeration tank 2 through a circulation pump and a pipeline. The outlet of the aeration tank 2 is connected and communicated with the inlet of the defoaming tank 3 through a water tank, so that the water in the aeration tank 2 can automatically flow into the defoaming tank. The outlet of the defoaming tank 3 is located on the side wall at its bottom. The outlet of the defoaming tank 3 is higher than the maximum liquid level height of the middle annular weir plate 41 of the sedimentation tank 4. The liquid in the defoaming tank 3 automatically flows into the sedimentation tank 4 through a pipeline. The liquid sedimented to the last stage in the sedimentation tank 4 is pumped into the multi-media filter 5 for treatment after being pressurized by a pump.

[0027] In this embodiment, the grit chamber is used for physical pretreatment, and its main functions are: removing large particle impurities such as grit and inorganic particles in the sewage. A coagulant (such as PAC polyaluminum chloride, aluminum sulfate, etc.) is added during operation to increase the sedimentation efficiency. If the suspended particles in the sewage are fine or difficult to settle naturally, a coagulant can be added to promote particle aggregation.

[0028] In this embodiment, the aeration tank mainly conducts biological treatment. Its main function is to degrade organic matter through microorganisms in the activated sludge and remove COD / BOD. When in use, nutrient agents (nitrogen source, phosphorus source) are added. If the carbon-nitrogen-phosphorus ratio in the influent is unbalanced (such as C:N:P≠100:5:1), urea, phosphate, etc. need to be supplemented. pH regulators (such as lime, sulfuric acid, sodium carbonate, etc.) can also be added to maintain a suitable growth environment for microorganisms (pH 6.5 - 8.5). If a large amount of foam is generated during the aeration process, an appropriate amount of defoamer (silicone-based, polyether-based) can be added.

[0029] In this embodiment, the foam separation tank is used to separate foam, remove the foam overflowing from the aeration tank, and prevent blockage of subsequent equipment. When in use, a defoamer (silicone, alcohols) is added, and the foam is quickly broken by direct spraying or dosing.

[0030] In this embodiment, the sedimentation tank is used for solid-liquid separation, mainly separating the activated sludge from water to achieve gradual separation of mud and water. When in use, a flocculant (PAM polyacrylamide) is added to promote the formation of sludge flocs and accelerate sedimentation. The coagulant aid (PAC polyaluminum chloride) can also be used in combination with PAM to enhance the flocculation effect.

[0031] In this embodiment, the multi-media filter is used for in-depth treatment of sewage. Residual suspended solids and colloids are intercepted by filter media such as quartz sand and activated carbon. When the multi-media filter needs to be backwashed, a backwash disinfectant (sodium hypochlorite) is added to the cleaning liquid to sterilize during regular backwashing and prevent filter media caking. Acid / alkali cleaning agents (HCl, NaOH) can also be added to remove scale or organic matter blockage on the surface of the filter media.

[0032] This invention simulates a pilot test in a certain sewage treatment plant (treatment scale 100m 3 / d). The sewage treatment equipment runs continuously for 90 days to obtain the average values in the following table. (Among them, the influent water quality of the test: COD 300 - 500mg / L, BOD 150 - 250mg / L, SS 200 - 400mg / L; hydraulic retention time: the total duration of the traditional process is, and the optimized process is 12 - 15h)

[0033]

[0034]

[0035] It can be concluded from the above table that this invention has good technical effects in the following aspects:

[0036] 1. Improvement of the grit chamber: By natural + high-efficiency spiral lifting, the sedimentation effect is improved, the residence time is shortened, and the SS removal rate is increased. 2. Precise aeration structure: The sludge concentration is increased to 8000 - 12000 mg / L (only 3000 - 5000 mg / L in the traditional method), the bubble diameter is ≤ 30 μm, and the capture efficiency is increased by 3 times compared with traditional air flotation (100 - 200 μm). 3. Multi - stage weir plate diffusion sedimentation: The theoretical sedimentation area is increased by 5 - 10 times, and the surface load is increased to 3 m 3 / (m 2 ·h). 4. Ultrafiltration membrane: The pore diameter of the ultrafiltration membrane is 0.01 μm, which can intercept 99.9% of bacteria and most viruses. 5. The overall sewage treatment equipment has high sewage treatment efficiency, good water quality and low equipment operation cost.

[0037] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include known common general knowledge or conventional technical means in the technical field not disclosed by the present invention. The specification and examples are only to be considered as exemplary, and the true scope of the present invention is pointed out by the claims.

[0038] It should be understood that the present invention is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above - described embodiments of the present invention do not constitute a limitation on the protection scope of the present invention.

Claims

1. A sewage treatment equipment, characterized in that: The invention comprises a grit chamber (1), an aeration chamber (2), a defoaming chamber (3), a sedimentation chamber (4), and a multi-media filter (5), wherein the grit chamber (1) is connected to the aeration chamber via a first pipe (101), the aeration chamber (2) is connected to the defoaming chamber (3) via a second pipe (102), the defoaming chamber (3) is connected to the sedimentation chamber (4) via a third pipe (103), and the sedimentation chamber (4) is connected to the multi-media filter (5) via a fourth pipe (104).

2. A sewage treatment equipment according to claim 1, characterized in that: The grit chamber (1) is provided with a water inlet pipe (11) at the front end and a drainage pipe (12) at the rear end. A plurality of sand discharge ports (15) are sequentially provided at the bottom of the grit chamber (1) from the front to the rear. A sand collecting cylinder (13) is provided below each of the sand discharge ports (15). The lower end of each of the sand collecting cylinders (13) is connected to a sand discharge pipe (14), respectively. The sand discharge pipe (14) is connected to a lifting pipe (16). A first screw conveying mechanism (17) is provided in each of the sand discharge pipes (14) and the lifting pipe (16). A vertical sand retaining plate (18) is provided at the front end of the grit chamber (1), and a corresponding screw lifting structure (19) is provided in each of the sand discharge ports (15) on the rear side of the sand retaining plate (18).

3. A sewage treatment equipment according to claim 2, characterized in that: The spiral lifting structure (19) comprises an inner cylinder (191), an outer cylinder (192), a support rod (193), and a first motor (194); the upper end of the outer cylinder (192) is fixedly connected to the top of the grit chamber (1); the inner cylinder (191) is coaxially arranged inside the outer cylinder (192); the lower end of the inner cylinder (191) extends out of the outer cylinder (192); spiral blades (1911) are arranged on the side wall of the inner cylinder (191) inside the outer cylinder (192); the first motor (194) is arranged at the top of the grit chamber (1); the output shaft of the first motor (194) extends into the upper end of the inner cylinder (191) and is fixedly connected to the inner wall of the inner cylinder (191) through the support rod (193).

4. A sewage treatment equipment according to claim 1, characterized in that: A column (21) is arranged on the side wall of the aeration tank (2), a cantilever beam (22) is arranged on the upper end of the column (21), one end of the cantilever beam (22) is fixedly connected to the column (21), and the other end is suspended above the aeration tank (2), a fixed pulley (23) is arranged on the suspended end of the cantilever beam (22), a steel wire rope (24) is arranged on the fixed pulley (23), one end of the steel wire rope (24) is connected to a winch (25) arranged on the cantilever beam (22), and the other end is connected to an aeration structure (26) arranged in the aeration tank (2).

5. A sewage treatment equipment according to claim 4, characterized in that: The aeration structure (26) comprises a fixing rod (261), a mounting plate (262), an aeration pipe (263), a gas nozzle (264), an air supply pipe (265), a guide rod (266), and a spray pipe (267). The fixing rod (261) is arranged on the top of the mounting plate (262), and the fixing rod (261) is fixedly connected to the steel wire rope (24). A plurality of vertically arranged aeration pipes (263) are arranged in an array on the bottom of the mounting plate (262), and the upper end of each aeration pipe (263) is fixedly connected to the mounting plate (262). A plurality of air jets are arranged on the side wall of each aeration pipe (263) along a circumferential direction, and each of the air jets is connected to a gas supply pipe (265). The aeration tank (2) comprises a body spray nozzle (264), an air supply pipe (265) is arranged on the mounting plate (262), the air supply pipe (265) is respectively connected to the upper end of each aeration pipe (263), the air supply pipe (265) is connected to an air pump through a gas pipe joint for air supply, a plurality of vertical guide rods (266) are arranged at the bottom of the aeration tank (2), the upper end of each guide rod (266) is inserted into a corresponding guide hole on the mounting plate (262) for vertical guiding and sliding fit, an annular spray pipe (267) is arranged at the upper end of each aeration pipe (263), a plurality of spray nozzles are arranged at the bottom of the spray pipe (267), and the spray pipe (267) is connected to a water pump through a water supply pipe.

6. A sewage treatment equipment according to claim 1, characterized in that: A foam discharge pipe (31) is arranged in the defoaming pool (3), a foam discharge hole (30) is arranged on a side wall of the defoaming pool (3), the foam discharge hole (30) is connected to one end of the foam discharge pipe (31), a collection box (36) is arranged on the outer side wall of the defoaming pool (3), two first gears (32) are arranged at both ends of the foam discharge pipe (31), a plurality of positioning shafts (321) are arranged in a circumferential direction in the center hole of each first gear (32), each positioning shaft (321) is connected to the side wall of the defoaming pool (3), a collection port (310) is arranged at the top of the foam discharge pipe (31), a plurality of horizontal support pipes (33) are arranged between the two first gears (32), and both ends of each support pipe (33) are provided with a plurality of positioning shafts (321). They are fixedly connected to the side walls of the two first gears (32), a foam collecting plate (34) is provided on each support tube (33), a plurality of annular grooves (311) are axially provided on the side wall of the foam discharge tube (31), a guide plate (341) connected to the foam collecting plate (34) is provided in each annular groove (311), two baffles (342) are provided at both ends of the foam collecting plate (34), a second gear (35) that can mesh with the first gear (32) is provided on one side of one of the first gears (32), and a first driving mechanism (37) for driving the second gear (35) to rotate is provided on the side wall of the defoaming pool (3) on the side of the second gear (35).

7. A sewage treatment equipment according to claim 1, characterized in that: A plurality of annular weir plates (41) are concentrically arranged in the sedimentation tank (4), and the height of each annular weir plate (41) gradually decreases from the middle to the periphery. A support plate (42) is arranged on the top of the annular weir plate (41) in the middle of the sedimentation tank (4), a bearing seat (43) is arranged on the support plate (42), a rotating shaft (44) is rotatably arranged on the bearing seat (43), a second driving mechanism for driving the rotating shaft (44) to rotate is arranged on one side of the rotating shaft (44), a rotating plate (45) is arranged on the upper end of the rotating shaft (44), a plurality of connecting rods (46) are arranged on the bottom of the rotating plate (45), and a debris removal scraper (47) is arranged at the lower end of each connecting rod (46).

8. A sewage treatment equipment according to claim 1, characterized in that: The multi-media filter (5) comprises a filter tank (51), a filter plate (52), and a filter medium (53). A plurality of filter plates (52) are sequentially arranged in the filter tank (51), and a filter medium (53) is arranged between two adjacent filter plates (52). A liquid inlet is arranged on a side wall at the lower end of the filter tank (51) and is connected to a liquid inlet pipe (511). The liquid inlet pipe (511) is connected to a fourth pipeline (104) via a booster pump. A liquid outlet is arranged on a side wall at the top of the filter tank (51) and is connected to a liquid outlet pipe (512). The liquid outlet pipe (512) is connected to a liquid drain groove (54) arranged at the top of the filter tank (51).

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