Sewage treatment equipment

Abstract

The utility model relates to the technical field of sewage treatment, and provides sewage treatment equipment which comprises a tank body, a flocculation reaction area, a pre-sedimentation area, a sedimentation area and an electrochemical water treatment area which are sequentially connected along the flowing direction of sewage are arranged in the tank body, and a sludge area is arranged below the pre-sedimentation area; a sewage inlet and a clear water outlet are formed in the tank body, the sewage inlet is connected with the flocculation reaction area, and the clear water outlet is connected with the electrochemical water treatment area. By means of the arrangement, coagulation, flocculation, sedimentation, filtration, scale inhibition and sterilization are integrated, the occupied area is reduced, the equipment investment is saved, and in the treatment process, sewage flows in different functional areas under the action of water pressure, so that circulation or lifting among different equipment through multiple sets of pumping equipment is not needed, and the operation cost of the system is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of sewage treatment, and in particular to a sewage treatment device. Background Technology

[0002] Oily, high-turbidity water is generally concentrated in the turbid circulating water system of iron and steel metallurgy, mainly as cooling water for products in rolling mills and continuous casting. Direct cooling water, due to direct contact with product materials, contains a large amount of pollutants such as iron oxide scale and lubricating oil. Secondly, there is the purified cooling water from coal gas and flue gas, which also contains a large amount of dust and impurities, all of which require purification treatment before reuse. This type of water is referred to as turbid circulating water. During use, turbid circulating water not only dissolves ions introduced during product cooling, such as F- ions from the mold flux in continuous casting machines, but also concentrates and accumulates ions in the makeup water as a large amount of water evaporates (the water consumption for secondary cooling of products is generally 0.5–0.8 m³ / t). This leads to problems such as scaling and corrosion. Generally, the concentration ratio of turbid circulating water is not well controlled, requiring a large amount of wastewater to reduce the concentration ratio, putting pressure on the operation of metallurgical wastewater treatment plants.

[0003] Among the related technologies, commonly used turbid circulating water treatment processes mainly include horizontal flow sedimentation tank + high speed filter treatment, chemical oil remover + high speed filter treatment, rare earth disk + high speed filter treatment, and pressurized integrated + dual cyclone filter treatment.

[0004] In the above treatment process, the wastewater passes through a primary iron scale pit and a cyclone well to remove large particles (above 50μm) of iron oxide scale. Then, the water is pumped into a sedimentation tank, where a chemical oil removal sedimentator is used to remove oil, a disk separator is used to remove fine particles of iron oxide scale from the water, and suspended solids are removed by coagulation and sedimentation. The effluent from the sedimentation tank is pumped into a filter for filtration.

[0005] However, in practical applications, it has been found that the above-mentioned treatment process results in low hydraulic surface load and long hydraulic retention time, requiring the construction of huge concrete tanks, which leads to large land area and high investment. In addition, during the treatment process, sewage needs to flow between different equipment through multiple sets of pumping equipment, resulting in high system operating costs. Utility Model Content

[0006] This utility model provides a sewage treatment equipment to solve the defects of existing treatment processes, such as large land area, large investment, and high system operating costs. It can save investment, save land, and reduce system operating costs.

[0007] This utility model provides a wastewater treatment device, comprising:

[0008] The tank body is provided with a flocculation reaction zone, a pre-sedimentation zone, a sedimentation zone and an electrochemical water treatment zone connected in sequence along the direction of sewage flow, as well as a sludge zone located below the pre-sedimentation zone.

[0009] The tank is equipped with a wastewater inlet and a clean water outlet. The wastewater inlet is connected to the flocculation reaction zone, and the clean water outlet is connected to the electrochemical water treatment zone.

[0010] According to the wastewater treatment equipment provided by this utility model, the flocculation reaction zone includes:

[0011] The first reaction zone has an inlet connected to the wastewater inlet, and a first return port is provided at the inlet of the first reaction zone to draw sludge from the sludge zone into the first reaction zone.

[0012] The second reaction zone has an inlet connected to the outlet of the first reaction zone and an outlet connected to the pre-sedimentation zone. A second reflux port is provided between the first reaction zone and the second reaction zone to allow wastewater from the second reaction zone to flow back to the first reaction zone.

[0013] According to the present invention, a wastewater treatment device is provided, wherein a jet mixer is arranged axially inside the tank.

[0014] Both the first reaction zone and the second reaction zone are formed within the jet mixer and arranged along the axial direction of the jet mixer, with the second reaction zone located outside the first reaction zone.

[0015] According to the present invention, a wastewater treatment device is provided, wherein the jet mixer includes: an outer cylinder with one end open, and a primary jet, a primary mixing pipe, a secondary jet and a secondary mixing pipe connected sequentially from the open end to the closed end of the outer cylinder, wherein the secondary mixing pipe is open at one end toward the closed end of the outer cylinder to form an internal first reaction zone and an external second reaction zone;

[0016] The inlet of the first-stage jet ejector is connected to the sewage inlet, and a gap is provided between the jet outlet and the inlet of the first-stage mixing pipe to form the first reflux port; a gap is provided between the jet outlet of the second-stage jet ejector and the inlet of the second-stage mixing pipe to form the second reflux port.

[0017] According to the wastewater treatment equipment provided by this utility model, the primary jet ejector includes:

[0018] The outer casing has an end interface for connecting to the inlet of the primary mixing pipe, and a side interface for connecting to at least one suction port for the sludge zone.

[0019] The first-stage Laval nozzle has its inlet exposed outside the housing to form the inlet of the first-stage jet injector, and its outlet located inside the housing to form the jet outlet of the first-stage jet injector. The outlet end of the first-stage Laval nozzle is clearance-fitted with the mating interface.

[0020] And / or, the secondary jet ejector includes a secondary Laval nozzle; the inlet of the secondary Laval nozzle is connected to the outlet of the primary mixing tube, and the outlet is formed as the jet outlet of the secondary jet ejector and is clearance-fitted with the inlet of the secondary mixing tube.

[0021] According to the wastewater treatment equipment provided by this utility model, a hydrocyclone is provided in the second reaction zone, and at least one hydrocyclone is arranged along the wastewater flow direction.

[0022] According to the wastewater treatment equipment provided by this utility model, the closed end of the outer cylinder is provided with a first refracting plate, and the first refracting plate is inclined toward the direction of the second reaction zone;

[0023] And / or the open end of the outer cylinder is provided with a second refracting plate, the second refracting plate being inclined toward the outside of the outer cylinder.

[0024] According to the wastewater treatment equipment provided by this utility model, the pre-settling zone and the settling zone are formed between the tank and the jet mixer, and the pre-settling zone is located below the settling zone;

[0025] The settling zone is provided with at least two layers of packing material, and the multiple layers of packing material are arranged at intervals along the flow direction of the sewage.

[0026] According to the wastewater treatment equipment provided by this utility model, at least the uppermost packing layer is provided with a backwash water distribution pipe above it; and / or each packing layer is provided with an air distribution pipe below it.

[0027] According to the present invention, a wastewater treatment device is provided in which the electrochemical water treatment zone is equipped with an electric field generator for generating an electric field and / or a magnetic field generator for generating a magnetic field.

[0028] According to the present invention, a wastewater treatment device is provided in which the suction port is connected to the sludge zone via a sludge suction pipe.

[0029] According to the present invention, a wastewater treatment device is provided, wherein the packing layer includes a packing support and packing; the packing includes inclined tubes and / or inclined plate packing.

[0030] The wastewater treatment equipment provided by this utility model allows pressurized wastewater mixed with flocculants, coagulants, and other agents to enter the flocculation reaction zone through the wastewater inlet on the tank. In the flocculation reaction zone, the wastewater undergoes a flocculation reaction, causing fine particles to aggregate into larger flocs. After flocculation, the wastewater enters the pre-sedimentation zone for initial sedimentation under water pressure. In the pre-sedimentation zone, larger and heavier flocs settle under gravity to form sludge. Small flocs that do not settle or are difficult to settle are captured and precipitated again in the sedimentation zone. The clarified liquid after re-precipitation enters the electrochemical water treatment zone for electrochemical scale inhibition and sterilization treatment under water pressure. The clarified liquid after electrochemical treatment is discharged through the clean water outlet. Compared with related technologies, the wastewater treatment equipment provided by this utility model integrates coagulation, flocculation, sedimentation, filtration, scale inhibition, and sterilization, reducing the floor space required and saving equipment investment. Furthermore, during the treatment process, the wastewater flows through different functional zones under water pressure, eliminating the need for multiple sets of pumps to circulate or lift between different devices, greatly reducing the system's operating costs. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the sewage treatment equipment provided in this embodiment of the utility model.

[0033] Figure 2 This is a schematic diagram of the jet mixer provided in an embodiment of the present invention.

[0034] Figure 3 This is a top view of the first-stage jet generator provided in this embodiment of the utility model.

[0035] Figure 4 This is a front view of the first-stage jet generator provided in an embodiment of this utility model.

[0036] Figure 5 This is a schematic diagram of the structure of the hydrocyclone provided in this embodiment of the utility model.

[0037] Figure 6 This is a schematic diagram of the structure of the packing layer and the settling zone provided in the embodiment of this utility model.

[0038] Figure 7 This is a schematic diagram of the structure of the filler layer provided in an embodiment of this utility model.

[0039] Figure 8This is a schematic diagram of the backwash water distribution pipe provided in an embodiment of this utility model.

[0040] Figure 9 This is a schematic diagram of the structure of the electric field generator, the magnetic field generator, and the electrochemical water treatment zone provided in this embodiment of the utility model.

[0041] Figure 10 This is one of the structural schematic diagrams of the electric field generator provided in the embodiments of this utility model.

[0042] Figure 11 This is the second structural schematic diagram of the electric field generator provided in this embodiment of the utility model.

[0043] Figure 12 This is a schematic diagram of the magnetic field generator provided in this embodiment of the utility model.

[0044] Figure 13 This is a schematic diagram of the generator unit provided in an embodiment of the present invention.

[0045] Figure label:

[0046] 10. Tank body; 11. Flocculation reaction zone; 110. First reaction zone; 111. Second reaction zone; 12. Pre-sedimentation zone; 13. Sedimentation zone; 14. Electrochemical water treatment zone; 15. Sludge zone; 16. Clear water outlet; 20. Jet mixer; 21. Outer cylinder; 210. First refracting plate; 211. Second refracting plate; 22. First-stage jet mixer; 220. Outer shell; 221. First-stage Laval nozzle; 23. First-stage mixing pipe; 24. Second-stage jet mixer; 240. Second-stage Laval nozzle; 25. Second-stage mixing pipe; 26. Hydrocyclone; 30. Inlet pipe; 40. Sludge suction pipe; 50. Packing layer; 500. Packing support; 501 51. Packing material; 52. First packing layer; 53. Second packing layer; 54. Third packing layer; 60. Backwash water distribution pipe; 600. Main pipe; 601. Branch pipe; 70. Electric field generator; 71. Ion generating ball; 710. Metal ball; 711. Insulation layer; 72. Guide rod; 720. Metal connecting rod; 73. Metal bolt; 730. Locking nut; 731. Compression nut; 74. Wire; 740. Terminal; 75. Flange cover plate; 750. Sealing surface; 76. Insulating cover plate; 77. High voltage power supply; 78. Grounding wire; 79. Sealing ring; 80. Magnetic field generator; 81. Generator unit; 810. Iron core; 811. Coil. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0048] To better understand the wastewater treatment equipment provided by this utility model, its application background is introduced first. In industrial processes such as iron and steel metallurgy, the circulating water used to directly cool products and equipment will come into direct contact with materials or high-temperature equipment during operation, and therefore will carry a large amount of suspended solids, oil, iron oxide scale and ionic impurities, which need to be purified and reused.

[0049] Among the related technologies, commonly used turbid circulating water treatment processes mainly include horizontal flow sedimentation tank + high speed filter treatment, chemical oil remover + high speed filter treatment, rare earth disk + high speed filter treatment, and pressurized integrated + dual cyclone filter treatment.

[0050] In the above treatment process, the wastewater needs to pass through the iron scale pit / cyclone well to remove large particles of iron oxide scale. Then, the water is pumped into the sedimentation tank, where the fine particles of iron oxide scale, oil and suspended solids in the water are removed by the horizontal flow tank / chemical oil removal sedimentation unit / disc pump. The effluent from the sedimentation tank needs to be pumped to the filter for filtration.

[0051] In practical applications, it has been found that the above-mentioned treatment process results in low hydraulic surface load and long hydraulic retention time, requiring the construction of huge concrete tanks, leading to large land area and high investment. Furthermore, during the treatment process, the sewage needs to be circulated and lifted between different equipment through multiple sets of pumping equipment, resulting in high system operating costs.

[0052] To address the above technical problems, this utility model provides a wastewater treatment device that can save investment, conserve land, and reduce system operating costs.

[0053] The following is combined with Figures 1-13 This invention describes the wastewater treatment equipment.

[0054] Reference Figure 1 A wastewater treatment device includes a tank 10, which contains a flocculation reaction zone 11, a pre-sedimentation zone 12, a sedimentation zone 13, and an electrochemical water treatment zone 14 connected sequentially along the wastewater flow direction, as well as a sludge zone 15 located below the pre-sedimentation zone 12. The tank 10 is provided with a wastewater inlet and a clean water outlet 16, with the wastewater inlet connected to the flocculation reaction zone 11 and the clean water outlet 16 connected to the electrochemical water treatment zone 14.

[0055] In practical applications, pressurized wastewater mixed with flocculants, coagulants, and other agents enters the flocculation reaction zone 11 through the wastewater inlet on the tank 10. The wastewater undergoes a flocculation reaction in the flocculation reaction zone 11, causing fine particles to aggregate into larger flocs. After the flocculation reaction, the wastewater enters the pre-sedimentation zone 12 for initial sedimentation under water pressure. In the pre-sedimentation zone 12, larger and heavier flocs settle under gravity to form sludge. Small flocs that do not have time to settle or are difficult to settle are captured and precipitated again in the sedimentation zone 13. The clear liquid after re-precipitation enters the electrochemical water treatment zone 14 for electrochemical scale inhibition and sterilization treatment under water pressure. The clear liquid after electrochemical treatment is discharged through the clear water outlet 16.

[0056] Compared with related technologies, the sewage treatment equipment provided by this utility model integrates coagulation, flocculation, sedimentation, filtration, scale inhibition and sterilization, which reduces the footprint and saves equipment investment. In addition, during the treatment process, sewage flows in different functional areas under water pressure, so it does not need to go through multiple sets of pumping equipment to circulate or lift between different equipment, which greatly reduces the operating cost of the system.

[0057] In some optional embodiments, the shape, material, and size of the tank 10 can be flexibly designed according to actual needs, such as sewage treatment capacity and water pressure, as long as it meets the required treatment capacity and pressure resistance. No specific limitations are imposed in this embodiment. Furthermore, the tank 10 can be reinforced with anti-corrosion treatment to enhance its corrosion resistance.

[0058] In one embodiment of this utility model, the sewage inlet is located at the bottom of the tank 10, and the clean water outlet 16 is located at the top of the tank 10. All of the above-mentioned functional areas are arranged along the axial direction of the tank 10.

[0059] The following section will describe in detail the various functional areas within the tank 10, with reference to the accompanying drawings.

[0060] In one embodiment of this utility model, the flocculation reaction zone 11 includes a first reaction zone 110 and a second reaction zone 111; wherein, the inlet of the first reaction zone 110 is connected to the sewage inlet, and a first reflux port is provided at the inlet of the first reaction zone 110 for sucking the sludge from the sludge zone 15 into the first reaction zone 110 to mix with the sewage; the inlet of the second reaction zone 111 is connected to the outlet of the first reaction zone 110, the outlet of the second reaction zone 111 is connected to the pre-sedimentation zone 12, and a second reflux port is provided between the first reaction zone 110 and the second reaction zone 111 for sucking the sewage from the second reaction zone 111 into the first reaction zone 110 to mix.

[0061] In practice, after wastewater enters the flocculation reaction zone 11 through the wastewater inlet, sludge from the sludge zone 15 can be drawn into the first reaction zone 110 through the first return port to mix with the wastewater. Under the action of the chemicals and the returned sludge, the wastewater in the flocculation reaction zone 11 forms a high-concentration suspended sludge layer, increasing particle collision opportunities and effectively adsorbing pollutants such as colloids, suspended solids, emulsified oil, COD, and metal ions. Sludge return not only saves on chemical dosage but also maintains the suspended solids concentration in the reaction zone at an optimal level, thereby optimizing the flocculation reaction. Through the second return port, wastewater from the second reaction zone 111 can be drawn back into the first reaction zone 110 for mixing, which helps unflocculated small particles re-enter the first reaction zone 110 for flocculation.

[0062] The sludge circulation coefficient can be obtained through coagulation calculation under actual working conditions. The wastewater return ratio in the second reaction zone 111 can be controlled and adjusted according to the calculated stirring gradient value under actual working conditions. No specific limitations are made in this embodiment of the utility model.

[0063] In one embodiment of this utility model, referring to Figure 1 and Figure 2 A jet mixer 20 is arranged axially inside the tank 10. A first reaction zone 110 and a second reaction zone 111 are both formed within the jet mixer 20 and arranged axially along its axis. The second reaction zone 111 is located around the first reaction zone 110. During flocculation, wastewater enters the first reaction zone 110 through the wastewater inlet and is mixed. Then, it flows out of the jet mixer 20 through the second reaction zone 111 and enters the pre-sedimentation zone 12 for sedimentation.

[0064] As a specific embodiment of this utility model, the jet mixer 20 includes an outer cylinder 21 with one end open, and a primary jet mixer 22, a primary mixing pipe 23, a secondary jet mixer 24, and a secondary mixing pipe 25 connected sequentially from the open end to the closed end of the outer cylinder 21; the secondary mixing pipe 25 is open at one end facing the closed end of the outer cylinder 21, thereby forming a first reaction zone 110 located on the inner side and a second reaction zone 111 located on the periphery of the first reaction zone 110; the inlet of the primary jet mixer 22 is connected to the sewage inlet, specifically, an inlet pipe 30 can be used to connect to the sewage inlet, and there is a gap between the jet outlet and the outlet of the primary mixing pipe 23, thereby forming the aforementioned first return port; there is a gap between the jet outlet of the secondary jet mixer 24 and the inlet of the secondary mixing pipe 25, thereby forming the aforementioned second return port.

[0065] In practical operation, pressurized wastewater enters the primary mixing pipe 23 in the form of a jet through the primary ejector 22. During jetting, a negative pressure is generated at the gap between the jet outlet of the primary ejector 22 and the primary mixing pipe 23, drawing sludge into the primary mixing pipe 23 for mixing with the wastewater. After flowing out of the primary mixing pipe 23, the wastewater enters the secondary mixing pipe 25 in the form of a jet through the secondary ejector 24. Similarly, during jetting, a negative pressure is generated at the gap between the jet outlet of the secondary ejector 24 and the inlet of the secondary mixing pipe 25, drawing wastewater from the outer second reaction zone 111 back into the secondary mixing pipe 25 for mixing. Through this technical solution, the power required for sludge intake and wastewater return is provided by the negative pressure generated by the jetting, thus eliminating the need for an additional pump and further reducing equipment operating costs.

[0066] In some optional embodiments, the specific shape, material, size and other parameters of each component in the jet mixer 20 can be flexibly designed according to actual needs, and no specific limitations are imposed in this embodiment of the utility model.

[0067] As a specific embodiment of this utility model, refer to Figures 2 to 4 The primary ejector 22 includes a housing 220 and a primary Laval nozzle 221. The housing 220 has an end for connecting to the primary mixing pipe 23 and a side for connecting to at least one suction port for the sludge zone 15. The inlet end of the primary Laval nozzle 221 protrudes from the housing 220 to form the inlet of the primary ejector 22, and the outlet end is located inside the housing 220 to form the jet outlet of the primary ejector 22. The outlet end of the primary Laval nozzle 221 is clearance-fitted with the interface of the housing 220.

[0068] In practical applications, the interface of the outer casing 220 is connected to the inlet of the primary mixing pipe 23. Due to the gap between the outlet end of the primary Laval nozzle 221 and the interface, there is a gap between the jet outlet of the primary ejector 22 and the inlet of the primary mixing pipe 23, thus forming the aforementioned first return port. The outer casing 220 can isolate the first reaction zone 110 and the second reaction zone 111, allowing the primary ejector 22 to directionally suck in the sludge from the sludge zone 15 through the suction port, thereby achieving sludge return.

[0069] In some optional embodiments, the specific number of inlet ports can be flexibly configured according to actual needs. For example, there can be one or more inlet ports. When there are multiple inlet ports, the multiple inlet ports can be evenly arranged around the housing 220.

[0070] Specifically, the suction port is connected to the junction of the pre-settling zone 12 and the sludge zone 15 via the sludge suction pipe 40, so as to ensure that the primary jet injector 22 can directionally suck in the sludge from the sludge zone 15.

[0071] As a specific embodiment of the present invention, the secondary jet ejector 24 includes a secondary Laval nozzle 240; the inlet end of the secondary Laval nozzle 240 is connected to the outlet of the primary mixing tube 23, and the outlet is formed as the jet outlet of the secondary jet ejector 24 and is gap-fitted with the inlet of the secondary mixing tube 25, thereby forming the aforementioned second return port.

[0072] In practical applications, the inlet end of the secondary Laval nozzle 240 is connected to the outlet end of the primary mixing pipe 23. Due to the gap fit between the outlet end of the secondary Laval nozzle 240 and the inlet end of the secondary mixing pipe 25, the first reaction zone 110 and the second reaction zone 111 can be connected through the gap between them. When sewage enters the secondary mixing pipe 25 from the secondary Laval nozzle 240 in a jet state, a negative pressure will be formed at the gap, thereby drawing the sewage in the second reaction zone 111 into the secondary mixing pipe 25 for remixing, thus realizing the return of sewage.

[0073] It should be noted that the specific structure of the Laval nozzle can be referenced from the existing technology. The specific structure and working principle of the Laval nozzle have not been changed in this embodiment of the present invention. Therefore, the specific structure of the Laval nozzle will not be described in detail in this embodiment of the present invention.

[0074] Furthermore, the gap between the Laval nozzle and the mixing tube inlet is crucial for controlling the reflux ratio. Therefore, the gap between the Laval nozzle and the mixing tube can be flexibly designed according to the actual required reflux ratio, and no specific limitations are imposed in this embodiment.

[0075] In one embodiment of the present invention, a first refractive plate 210 is provided at the closed end of the outer cylinder 21, and the first refractive plate 210 is inclined toward the direction of the second reaction zone 111; a second refractive plate 211 is provided at the open end of the outer cylinder 21, and the second refractive plate 211 is inclined toward the outside of the outer cylinder 21.

[0076] Specifically, the end plate of the closed end of the outer cylinder 21 is tilted at a certain angle relative to its axis, thereby forming the first refractive plate 210 mentioned above; the second refractive plate 211 is integrally formed at the open end of the outer cylinder 21.

[0077] The specific tilt angles of the first refractive plate 210 and the second refractive plate 211 can be flexibly set according to the actual working conditions, and no specific restrictions are imposed in this embodiment of the utility model.

[0078] In practical applications, the wastewater discharged from the secondary mixing pipe 25 is refracted at a certain angle by the first refractive plate 210 and then enters the second reaction zone 111. The wastewater discharged from the second reaction zone 111 is refracted at a certain angle by the second refractive plate 211 and then discharged from the outer cylinder 21 and enters the pre-settling zone 12.

[0079] In one embodiment of this utility model, referring to Figure 2 and Figure 5 A hydrocyclone 26 is provided in the second reaction zone 111, and at least one hydrocyclone 26 is arranged along the flow direction of the sewage.

[0080] Specifically, the hydrocyclone 26 generally includes an annular frame and multiple swirling guide vanes arranged in the frame and around the frame axis. After being guided by the swirling guide vanes, the sewage flows in a spiral shape, and under the action of centrifugal force, larger and heavier flocs settle.

[0081] The specific structure of the hydrocyclone 26 can be referred to the existing guide vane hydrocyclone, and will not be described in detail in this embodiment. The specific specifications of the hydrocyclone 26 can be flexibly designed according to the actual working conditions, and will not be specifically limited in this embodiment.

[0082] Specifically, three hydrocyclones 26 are installed between the primary mixing pipe 23, the secondary mixing pipe 25 and the outer wall of the outer cylinder 21, and the three hydrocyclones 26 have the same swirling direction.

[0083] Wastewater discharged from the secondary mixing pipe 25 is refracted at a certain angle by the first refractive plate 210 and enters the second reaction zone 111. The mixed liquid after passing through the hydrocyclone 26 forms a solid floc and is discharged from the outer cylinder 21 along the second refractive plate 211, entering the pre-settling zone 12 of the tank 10. In the pre-settling zone 12, the flow rate decreases, and the fine floc continues to grow, forming large flocs, which, together with the settling particles that fall off the inclined plate of the settling zone 13, settle into the sludge zone 15.

[0084] Specifically, the pre-settling zone 12 and the settling zone 13 are formed between the tank 10 and the outer cylinder 21 of the jet mixer 20, and the pre-settling zone 12 is located below the settling zone 13.

[0085] To improve settling efficiency, in one embodiment of this utility model, reference is made to... Figure 6 and Figure 7 The settling zone 13 is provided with at least two layers of packing material 50, and the multiple layers of packing material 50 are arranged at intervals along the flow direction of sewage.

[0086] Specifically, since the pre-settling zone 12 and the settling zone 13 are formed between the tank body 10 and the outer cylinder 21, the sewage flows along the axial direction of the tank body 10 in the settling zone 13. Therefore, the multi-layer packing layer 50 is arranged at intervals along the axial direction of the tank body 10.

[0087] Specifically, the packing layer 50 includes a packing support 500 and packing 501; wherein, the packing support 500 can be fixedly connected to the tank body 10, or fixedly connected to the outer cylinder 21, or fixedly connected to both the outer cylinder 21 and the tank 10 at the same time. The specific selection can be flexibly made according to the different arrangement positions of the packing layer 50. The packing support 500 is used to provide support for the packing 501; the packing 501 is selected as inclined tube and / or inclined plate packing 501.

[0088] By adopting the above technical solution, the settling zone 13 can be divided into a series of shallow sedimentation layers through the packing layer 50. The treated and settled sludge moves and separates in each shallow sedimentation layer. By utilizing the laminar flow principle, the treatment capacity of the sedimentation tank is improved, the particle settling distance is shortened, thereby shortening the settling time and increasing the settling area of ​​the sedimentation tank, thus improving the treatment efficiency.

[0089] The specific quantity and structure of the packing layer 50 can be flexibly arranged according to actual needs.

[0090] In one embodiment of the present invention, the packing layer 50 is arranged in three layers, and the three packing layers 50 are respectively a first packing layer 51, a first packing layer 52 and a first packing layer 53 in the sewage flow direction; wherein, the packing 501 of the first packing layer 51 is a layer of inclined tube packing; the packing 501 in the first packing layer 52 includes a layer of inclined tube packing and a layer of inclined plate packing arranged sequentially in the sewage flow direction; the packing 501 in the first packing layer 53 is inclined plate packing.

[0091] The specific materials, filling height, filling angle, and other parameters of the inclined tubes and / or inclined plates in each packing layer 50 can be flexibly designed according to the actual working conditions. For example, they can be calculated using the formula for the settling velocity of the inclined tubes and inclined plates in counter-current flow to achieve the best settling separation efficiency and economic benefits.

[0092] In practice, after the sewage treatment equipment has been running for a certain period of time, a certain amount of oil sludge will accumulate on the packing layer 50, which will seriously block the packing 501 and cause short flow, affecting the quality of the treated water.

[0093] To solve the above-mentioned technical problems, refer to Figure 6 and Figure 8 In one embodiment of this utility model, a backwash water distribution pipe 60 is arranged above at least the uppermost packing layer 50, i.e., the first packing layer 53. When a short flow occurs due to blockage of the packing 501, the backwash water distribution pipe 60 is opened to backwash the packing layer 50 to ensure the quality of the effluent.

[0094] Specifically, the backwash water distribution pipe 60 includes a main pipe 600 and multiple branch pipes 601; wherein, the multiple branch pipes 601 are all connected to the main pipe 600 and cover the entire first packing layer 53, and the branch pipes 601 are provided with water distribution holes. During backwashing, backwash water is distributed to the multiple branch pipes 601 through the main pipe 600, and the packing 501 is backwashed through the water distribution holes on the branch pipes 601.

[0095] Understandably, the backwash water can be supplied by the backwash pump or by the effluent from other wastewater treatment equipment.

[0096] To improve the backwashing effect, in one embodiment of this utility model, an air distribution pipe can be set below each layer of packing 501, and a combined air and water backwash can be performed when the packing 501 is severely blocked.

[0097] To ensure water output efficiency, in one embodiment of this invention, the first packing layer 51 and the first packing layer 52 are disposed between the tank body 10 and the outer cylinder 21, and the first packing layer 53 is disposed above the jet mixer 20 and covers the entire cross-section of the tank body 10, serving to separate the settling zone 13 and the electrochemical water treatment zone 14. In actual operation, the pre-sedimented wastewater passes through the first packing layer 51 and the first packing layer 52 in sequence, and then collects in the space between the first packing layer 52 and the first packing layer 53. After settling through the first packing layer 53, it enters the electrochemical water treatment zone 14 for electrochemical treatment, and the clean water after electrochemical treatment is discharged through the clean water outlet 16.

[0098] In one embodiment of this utility model, referring to Figure 1 and Figure 9 An electric field generator 70 for generating an electric field and a magnetic field generator 80 for generating a magnetic field are installed in the electrochemical water treatment zone 14.

[0099] Specifically, the magnetic field generator 80 is used to generate a low-voltage pulsed magnetic field, and the electric field generator 70 is used to generate a high-voltage electrostatic field. The electric and magnetic fields are cut during the wastewater flow process to inhibit scale and kill bacteria.

[0100] Through the above technical solution, the combined action of a low-voltage pulsed magnetic field and a high-voltage electrostatic field is used to inhibit scale formation. The electric and magnetic field energy transferred to the wastewater causes two main effects: First, water dipole molecules become directionally polarized, increasing the distance between the centers of positive and negative charges within the water molecules, thus increasing the dipole moment and polarity. This elongates the hydrogen bonds binding the water molecules, causing water molecule clusters to become smaller clusters. Electromagnetic energy is converted into internal energy within the water molecules, increasing their activation. Second, when a pulse wave is applied to coil 811, the energy accumulated in coil 811 generates a high-voltage backflow at the moment the pulse is switched on and off. This sudden circuit shutdown causes a surge in the induced voltage in the water, maximizing the transfer of pulsed magnetic energy. Simultaneously, when the applied pulse frequency is close to or proportional to the water molecule frequency, the resonance with the water molecules intensifies. The centers of gravity of the positive and negative charges in the water molecules periodically deflect with the pulse frequency, repeatedly polarizing the water molecule dipoles and further increasing their activation. This activation of water molecules also affects the Ca2+ in the water. 2+ (Water) and CO3 2- The enhanced hydration of water ions hinders the formation of solid scale from the accumulation of microcrystals, increases the tendency of scale to dissolve in water, and reduces the tendency to precipitate and form CaCO3 scale, thus achieving the purpose of scale inhibition.

[0101] In one embodiment of this utility model, referring to Figure 10 and Figure 11 The electric field generator 70 includes an ion generating ball 71 and a guide rod 72. The ion generating ball 71 is suspended in the electrochemical water treatment zone 14 by the guide rod 72. Specifically, the ion generating ball 71 can be located in the middle of the electrochemical water treatment zone 14. The ion generating ball 71 is electrically connected to an external high-voltage power supply 77 through the guide rod 72, so that the ion generating ball 71 generates an electrostatic field.

[0102] Specifically, the ion generating ball 71 includes an inner metal ball 710 and an insulating layer 711 wrapped around the metal ball 710; the guide rod 72 includes an inner metal connecting rod 720 and an insulating layer 711 wrapped around the metal connecting rod 720; the metal ball 710 and the metal connecting rod 720 are fixedly connected.

[0103] Specifically, the metal sphere 710 can be a hollow aluminum sphere, and the metal connecting rod 720 can also be a hollow aluminum connecting rod. The metal sphere 710 and the metal connecting rod 720 are connected together by a metal bolt 73. The metal bolt 73 can be a copper bolt, with its large end located inside the metal sphere 710 and abutting against the inner wall of the metal sphere 710. Its small end passes through the metal sphere 710 and the metal connecting rod 720 in sequence and is then locked by a locking nut 730, thereby achieving the connection between the metal connecting rod 720 and the metal sphere 710. To ensure sealing, the insulating layer 711 on the outside of the metal sphere 710 and the insulating layer 711 on the outside of the metal connecting rod 720 are integrally formed.

[0104] To facilitate the electrical connection between the metal connecting rod 720 and an external power source, a clamping nut 731 is threaded onto the metal bolt 73. The clamping nut 731 is located on the side of the locking nut 730 away from the metal ball 710. One end of the wire 74 is connected to a terminal 740. The terminal 740 is sleeved on the metal bolt 73 and located between the clamping nut 731 and the locking nut 730. The terminal 740 is clamped by the cooperation of the clamping nut 731 and the locking nut 730. The other end of the wire 74 passes through the insulation layer 711 for electrical connection with the external high-voltage power source 77.

[0105] To facilitate the connection and fixation of the electric field generator 70 to the top of the tank 10, in one embodiment of this invention, a manhole is provided at the top of the tank 10. A manhole flange is fixedly connected to the manhole, and a flange cover plate 75 is bolted to the manhole flange. The flange cover plate 75 has a mounting hole in the middle, and the end face of the flange cover plate 75 away from the manhole flange is set as a sealing surface 750. Multiple flange holes are provided on the sealing surface 750 surrounding the mounting hole. An insulating cover plate 76 is fixedly connected to the end of the guide rod 72 away from the ion generating ball 71. The insulating cover plate 76 is pressed against the sealing surface 750 of the flange cover plate 75 and fixedly connected by bolts, thereby realizing the connection of the ion generator to the tank 10.

[0106] In one embodiment of this utility model, a sealing ring 79 is provided between the insulating cover plate 76 and the sealing surface 750 to ensure sealing performance. Specifically, a sealing groove is provided on the insulating cover plate 76, and the sealing ring 79 is embedded in the sealing groove.

[0107] In one embodiment of this utility model, in order to ensure insulation performance, the insulating cover plate 76 and the insulating layer 711 are integrally formed.

[0108] In one embodiment of this utility model, both the insulating layer 711 and the outer insulating layer 711 of the wire 74 are made of PTFE (polytetrafluoroethylene) material.

[0109] Specifically, the high-voltage power supply 77 is a common high-voltage DC power supply on the market, with an output voltage level of no more than 10,000 volts. The positive terminal of the high-voltage power supply 77 is electrically connected to the electric field generator 70 through the wire 74, and the negative terminal is grounded through the grounding wire 78.

[0110] In one embodiment of this utility model, referring to Figure 12 and Figure 13 The magnetic field generator 80 includes multiple generator units 81, which are grouped in pairs. The two generator units 81 in each group are located on opposite sides of the tank 10 along the first direction. The multiple groups of generator units 81 are arranged along the second direction of the tank 10. The first direction and the second direction are both radial directions of the tank 10, and the first direction is perpendicular to the second direction.

[0111] Specifically, the generator unit 81 includes an iron core 810 and a coil 811 wound around the iron core 810. The iron core 810 generates a magnetic field by connecting a low-voltage pulsed magnetic field power supply to the coil 811.

[0112] Specifically, the coils 811 in each generator unit 81 are connected in series, while the coils 811 in different generator units 81 are connected in parallel.

[0113] Specifically, the low-voltage pulsed magnetic field power supply is designed as a low-voltage square wave pulse power supply.

[0114] It should be noted that the voltage, input frequency and other parameters of the low-voltage pulse magnetic field power supply, as well as the material of the iron core 810 and the number of turns of the coil 811, can all be set according to the actual required magnetic field strength. No specific restrictions are imposed in this embodiment of the utility model.

[0115] It is understood that, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

[0116] The wastewater treatment equipment provided by this utility model integrates coagulation, flocculation, sedimentation, filtration, scale inhibition and sterilization, which reduces the footprint and saves equipment investment. During the treatment process, the wastewater flows in different functional areas under water pressure, so it does not need to go through multiple sets of pumping equipment to circulate or lift between different equipment, which greatly reduces the operating cost of the system.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A wastewater treatment device, characterized in that, include: Tank (10), wherein the tank (10) is provided with a flocculation reaction zone (11), a pre-sedimentation zone (12), a sedimentation zone (13) and an electrochemical water treatment zone (14) connected in sequence along the direction of sewage flow, and a sludge zone (15) provided below the pre-sedimentation zone (12); The tank (10) is provided with a sewage inlet and a clean water outlet (16). The sewage inlet is connected to the flocculation reaction zone (11), and the clean water outlet (16) is connected to the electrochemical water treatment zone (14). The flocculation reaction zone (11) includes: The first reaction zone (110) is connected to the sewage inlet. The first reaction zone (110) is provided with a first return port at the inlet to suck the sludge from the sludge zone (15) into the first reaction zone (110). The second reaction zone (111) has an inlet connected to the outlet of the first reaction zone (110) and an outlet connected to the pre-sedimentation zone (12). A second reflux port is provided between the first reaction zone (110) and the second reaction zone (111) to allow the wastewater from the second reaction zone (111) to reflux back to the first reaction zone (110).

2. The wastewater treatment equipment according to claim 1, characterized in that, A jet mixer (20) is arranged axially inside the tank (10); The first reaction zone (110) and the second reaction zone (111) are both formed in the jet mixer (20) and arranged along the axial direction of the jet mixer (20), and the second reaction zone (111) is located on the periphery of the first reaction zone (110).

3. The wastewater treatment equipment according to claim 2, characterized in that, The jet mixer (20) includes: an outer cylinder (21) with one end open, and a first-stage jet mixer (22), a first-stage mixing tube (23), a second-stage jet mixer (24) and a second-stage mixing tube (25) connected sequentially from the open end to the closed end of the outer cylinder (21). The second-stage mixing tube (25) is open at one end toward the closed end of the outer cylinder (21) to form an internal first reaction zone (110) and an external second reaction zone (111). The inlet of the first-stage jet ejector (22) is connected to the sewage inlet, and a gap is provided between the jet outlet and the inlet of the first-stage mixing pipe (23) to form the first return port; a gap is provided between the jet outlet of the second-stage jet ejector (24) and the inlet of the second-stage mixing pipe (25) to form the second return port.

4. The wastewater treatment equipment according to claim 3, characterized in that, The primary jet ejector (22) includes: The outer casing (220) has an end with a docking port for connecting to the inlet of the primary mixing pipe (23) and a side with at least one suction port for connecting to the sludge zone (15). The first-stage Laval nozzle (221) has its inlet exposed outside the housing (220) to form the inlet of the first-stage jet injector (22), and its outlet located inside the housing (220) to form the jet outlet of the first-stage jet injector (22). The outlet end of the first-stage Laval nozzle (221) is fitted with the mating interface with a clearance. And / or, the secondary jet ejector (24) includes a secondary Laval nozzle (240); the inlet of the secondary Laval nozzle (240) is connected to the outlet of the primary mixing tube (23), and the outlet is formed as the jet outlet of the secondary jet ejector (24) and is clearance-fitted with the inlet of the secondary mixing tube (25).

5. The wastewater treatment equipment according to any one of claims 1 to 4, characterized in that, A hydrocyclone (26) is provided in the second reaction zone (111), and at least one hydrocyclone (26) is arranged along the direction of sewage flow.

6. The wastewater treatment equipment according to claim 3, characterized in that, The closed end of the outer cylinder (21) is provided with a first refracting plate (210), which is inclined toward the second reaction zone (111); And / or the open end of the outer cylinder (21) is provided with a second refracting plate (211), the second refracting plate (211) being inclined toward the outside of the outer cylinder (21).

7. The wastewater treatment equipment according to claim 3, characterized in that, The pre-settling zone (12) and the settling zone (13) are formed between the tank (10) and the jet mixer (20), with the pre-settling zone (12) located below the settling zone (13); The settling zone (13) is provided with at least two layers of packing material (50), and the multiple layers of packing material (50) are arranged at intervals along the flow direction of sewage.

8. The wastewater treatment equipment according to claim 7, characterized in that, A backwash water distribution pipe (60) is arranged above at least the uppermost packing layer (50); and / or an air distribution pipe is arranged below each packing layer (50).

9. The wastewater treatment equipment according to claim 1, characterized in that, The electrochemical water treatment zone (14) is equipped with an electric field generator (70) for generating an electric field and / or a magnetic field generator (80) for generating a magnetic field.

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