Biological contact oxidation device

Abstract

The invention relates to a biological contact oxidation device which comprises a contact oxidation pond, a three-dimensional grid filler and an aeration device, the three-dimensional grid filler is arranged in the contact oxidation pond, the three-dimensional grid filler is of a three-dimensional tubular structure in the vertical direction, and the three-dimensional grid filler is of a net structure formed by connecting a plurality of three-dimensional tubular structures in the horizontal direction; the three-dimensional tubular structure is formed by bending, staggering and winding a plurality of filaments, and micropore structures are formed among the filaments; the aeration device comprises an air chamber component located below the three-dimensional grid filler and an air supply device connected with the air chamber component, and the air chamber component is provided with aeration holes. According to the biological contact oxidation device, the problem that the aeration device and the three-dimensional grid filler are easy to block is solved by matching large bubble aeration with the geometric structure of the three-dimensional grid filler, the cleaning and maintenance periods of the filler and the aeration device are prolonged, and underwater maintenance operation of the filler and the aeration device is not needed in the whole operation life cycle; and the operation maintenance and equipment depreciation cost is reduced, and the operation risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly relates to a biological contact oxidation device for sewage treatment. Background Art

[0002] Existing biological contact oxidation devices mostly use fixed fillers (such as elastic fillers, combined fillers, braided belt fillers, etc.) or suspended fillers (such as polyurethane sponge fillers, various suspended fillers used in moving bed biofilm reactors such as high-density polyethylene suspended carriers for water treatment, etc.) as biological carriers, and use perforated pipes or microporous aeration equipment for aeration and oxygenation. The aeration systems and fillers of existing biological contact oxidation devices are prone to blockage, resulting in the need for multiple operations of replacing the in-tank aeration discs and / or fillers with relatively high risks during the operation of the device.

[0003] Since the biofilm that falls off during operation will enter the diaphragms of the microporous aeration discs or the tubes of the perforated pipes and gradually deposit, the aeration system needs to replace the aeration discs or perforated aeration pipes after operating for a period of time. At the same time, the fillers in the contact oxidation tanks using fixed bed fillers and moving bed fillers are both prone to blockage. During the operation of the biological contact oxidation device, microorganisms will continuously accumulate on the surface of the fillers, eventually blocking the pores of the fillers. After blockage, the specific surface area of the microbial mass decreases, resulting in a decline in treatment effect. At the same time, the proportion of the internal anaerobic environment increases, generating a large amount of odors and weakening the biochemical treatment effect. Summary of the Invention

[0004] The purpose of the present invention is to provide a biological contact oxidation device to solve the problem that the fillers and aeration devices are prone to blockage and extend the maintenance cycle of the fillers and aeration devices.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A biological contact oxidation device, comprising: A contact oxidation tank; A three-dimensional grid filler, the three-dimensional grid filler is arranged in the contact oxidation tank, the three-dimensional grid filler is a three-dimensional tubular structure in the vertical direction and a net structure formed by connecting multiple three-dimensional tubular structures in the horizontal direction. The three-dimensional tubular structure is formed by bending and intertwining multiple silk strips serving as microbial carriers, and microporous structures for water and air permeation are formed between the silk strips; An aeration device, the aeration device includes a plurality of air chamber components arranged in the contact oxidation tank and a gas supply device connected to the air chamber components. The air chamber components are located below the three-dimensional grid filler, at least one side air chamber wall of the air chamber component is provided with air holes, and the notch at the bottom of the air chamber component faces the bottom of the contact oxidation tank.

[0006] In an embodiment of the present application, the filament is a polymer material fiber filament with a diameter of 0.5 mm to 5 mm.

[0007] In an embodiment of the present application, the polymer material fiber filament is made of high-density polyethylene or thermoplastic polyurethane elastomer.

[0008] In an embodiment of the present application, the pore diameter of the microporous structure is 1 mm to 10 mm.

[0009] In an embodiment of the present application, the inner diameter of the three-dimensional tubular structure is 20 mm to 100 mm.

[0010] In an embodiment of the present application, the center distance between two adjacent three-dimensional tubular structures is 25 mm to 120 mm.

[0011] In an embodiment of the present application, the air chamber member is a groove-shaped structure with a notch provided at the bottom and closed in other directions. At least one of the top, end, and side of the air chamber member is provided with an air inlet hole, and an air inlet pipe connected to the air supply device is provided at the air inlet hole.

[0012] In an embodiment of the present application, an air inlet hole is provided at the top of the air chamber member, and a flow guiding device is provided inside the air chamber member. The flow guiding device is disposed opposite to the air inlet hole, and / or the flow guiding device is communicated with the air inlet hole. The flow guiding device is used to make the air flow output by the air supply device flow in the air chamber member in a preset direction.

[0013] In an embodiment of the present application, the flow guiding device is a flow guiding plate. The opposite two side edges of the flow guiding plate are connected to the opposite two air chamber walls of the air chamber member, and the flow guiding plate is located below the air inlet hole.

[0014] In an embodiment of the present application, the flow guiding plate includes two symmetrically arranged plate portions. The first ends of the two plate portions are connected to each other below the air inlet hole, the second ends of the two plate portions are away from each other, and the plate portions are inclined in a direction away from the air inlet hole starting from the first end, so that the included angle between the two plate portions is 90° to 150°, and the distance between the second ends of the two plate portions in the horizontal direction is 3 times to 10 times the diameter of the air inlet hole.

[0015] In an embodiment of the present application, the flow guiding device is a flow guiding pipe. The flow guiding pipe includes an inlet pipe section and a plurality of outlet pipe sections. Each of the outlet pipe sections is circumferentially and uniformly connected to the inlet pipe section, and one end of the inlet pipe section away from the outlet pipe section is connected to the air inlet hole.

[0016] In an embodiment of the present application, the distance between the outer wall surfaces of the two air chamber walls in the width direction of the air chamber member is 20 mm to 100 mm, the height from the top to the bottom is 100 mm to 250 mm, the length of the air chamber member is less than the width of the contact oxidation tank, and the difference between the two is less than or equal to 3 times the center distance between two adjacent aeration holes.

[0017] In an embodiment of the present application, the aperture of the aeration hole is 2 mm to 8 mm.

[0018] In an embodiment of the present application, one row or multiple rows of the aeration holes are arranged on the air chamber wall of the air chamber member. Each row of the aeration holes includes multiple aeration holes arranged at intervals in the horizontal direction. The center distance between two adjacent aeration holes in the same row is 30 mm to 300 mm, and the center distance between two adjacent aeration holes in the same row is 1 time to 5 times the center distance between two adjacent three-dimensional tubular structures.

[0019] In an embodiment of the present application, multiple rows of the aeration holes are arranged on the air chamber wall of the air chamber member. The adjacent two rows of the aeration holes are arranged in a staggered manner in the vertical direction. The height difference between the adjacent two rows of the aeration holes is greater than 5 times the aperture of the aeration hole, and the aperture of the aeration hole in the lower row of the adjacent two rows of the aeration holes is 1 mm to 3 mm larger than the aperture of the aeration hole in the upper row, or 30% to 100% larger than the aperture of the aeration hole in the upper row.

[0020] In an embodiment of the present application, in the horizontal direction, the center distance between two adjacent air chamber members is 100 mm to 500 mm, and the center distance between two adjacent air chamber members is 2 times to 6 times the center distance between two adjacent three-dimensional tubular structures.

[0021] In an embodiment of the present application, the gap between the three-dimensional grid packing and the pool wall of the contact oxidation tank is less than 1 / 2 of the inner diameter of the three-dimensional tubular structure.

[0022] As can be seen from the above technical solutions, a biological contact oxidation device is disclosed in the present invention. The biological contact oxidation device includes a contact oxidation tank, a three-dimensional grid filler, and an aeration device. Among them, the contact oxidation tank is used to hold sewage. The three-dimensional grid filler is arranged in the contact oxidation tank. The three-dimensional grid filler is a three-dimensional tubular structure in the vertical direction and a network structure formed by connecting multiple three-dimensional tubular structures in the horizontal direction. The three-dimensional tubular structure is formed by bending and intertwining multiple filaments serving as microbial carriers. Microporous structures for water and air permeation are formed between the filaments. The aeration device includes multiple air chamber components arranged in the contact oxidation tank and a gas supply device connected to the air chamber components. The air chamber components are located below the three-dimensional grid filler. At least one side air chamber wall of the air chamber component is provided with air holes. An air inlet hole is provided at the top of the air chamber component. The notch at the bottom of the air chamber component faces the bottom of the contact oxidation tank. In application, the biological contact oxidation device of the present invention can be single-stage or multi-stage in series and cooperate with equipment such as sewage lift pumps, fine grids, sedimentation tanks, and disinfection tanks to form a complete set of sewage treatment systems. Microorganisms adhere to the network surface of the three-dimensional grid filler. After the sewage flows through, the microorganisms degrade and assimilate the pollutants in the water, grow and apoptose continuously, and form a biological film on the surface of the filler. The thickness of the biological film increases continuously with the operation of the biological contact oxidation device, and the increasing speed is usually greater than the natural shedding speed. The air chamber component intakes air from the air inlet hole at the top. Under the action of pressure, the gas overflows from the air holes on the air chamber wall of the air chamber component to form bubbles and enter the contact oxidation tank. Since the position of the air holes is on the air chamber wall of the air chamber component, there will be no deposition and attachment of the shed biological film.

[0023] During the rising process of the bubbles, they enter the lumen of the three-dimensional tubular structure of the three-dimensional grid filler. They not only play a role in peeling the biological film attached to the surface of the three-dimensional grid filler through the gravity waves generated in the water during the rising process, but also directly contact the inner lumen surface of the three-dimensional tubular structure of the three-dimensional grid filler due to horizontal oscillation during the rising process, and directly peel the outer layer of the biological film under the action of shear force.

[0024] During the rising process, the bubbles are also cut and fragmented by the filamentous polymer materials forming the microporous structure due to contact with the microporous structure of the tube wall of the three-dimensional tubular structure of the three-dimensional grid filler, and smaller-sized bubbles are formed during the rising process. Some of the smaller-sized bubbles enter the deep interior of the three-dimensional grid filler to perform air washing and aeration on the deep layer of the three-dimensional grid filler. The remaining smaller-sized bubbles are restricted and collided in the inner lumen of the three-dimensional tubular structure to merge into larger-sized bubbles, and continue to brush and oxygenate the three-dimensional grid filler during the floating process until they reach the water surface and completely burst.

[0025] Since the three-dimensional grid packing is composed of square or rectangular modules formed by splicing multiple three-dimensional tubular structures, the modules can be spliced seamlessly or with small gaps and fill the entire square contact oxidation tank body without leaving large areas of packing vacancies. In the entire contact oxidation tank, there will be no uneven aeration caused by aeration overflowing upward from the vacant tank space. The modules can also be stacked in multiple layers to increase the thickness of the three-dimensional grid packing, enhance the packing volume, and improve the treatment effect.

[0026] In summary, in the above biological contact oxidation device, when the aeration volume increases, the biofilm shedding rate can increase to be greater than the biological growth rate, and when the aeration volume decreases, the biofilm shedding rate can be controlled within a range less than the biological growth rate. Since the functions of the biofilm growth rate and the shedding rate with respect to the aeration volume are both continuous, according to basic mathematical principles, there must be an aeration volume that can keep the biomass in the biofilm stable without growth or decay, that is, maintain the biomass and never get blocked. At the same time, the structural design of the three-dimensional grid packing and the air chamber components can effectively avoid the problem of easy blockage of the packing and the aeration device, extend the cleaning and maintenance cycle of the three-dimensional grid packing and the aeration device to be consistent with the life of the contact oxidation tank, so that the biological contact oxidation device does not require underwater maintenance and replacement of the packing and the aeration device during the entire operation life cycle, reducing the operation and maintenance costs and equipment depreciation costs, and also reducing the operation risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1 It is a schematic structural diagram of the biological contact oxidation device provided by the embodiment of the present invention; Figure 2 It is a horizontal sectional view of the biological contact oxidation device provided by the embodiment of the present invention; Figure 3 It is an axonometric view of the three-dimensional grid packing provided by the first embodiment of the present invention; Figure 4 It is a top view of the three-dimensional grid packing provided by the first embodiment of the present invention; Figure 5 It is an axonometric view of the three-dimensional grid packing provided by the second embodiment of the present invention; Figure 6 It is a top view of the three-dimensional grid packing provided by the second embodiment of the present invention; Figure 7Isometric view of the air chamber member of the aeration device provided in the first embodiment of the present invention; Figure 8 Cross-sectional view of the air chamber member of the aeration device provided in the first embodiment of the present invention along the length direction; Figure 9 Cross-sectional view of the air chamber member of the aeration device provided in the second embodiment of the present invention along the length direction; Figure 10 Cross-sectional view of the air chamber member of the aeration device provided in the third embodiment of the present invention along the length direction; Figure 11 Cross-sectional view of the air chamber member of the aeration device provided in the fourth embodiment of the present invention along the length direction; Figure 12 Cross-sectional view of the air chamber member of the aeration device provided in the fifth embodiment of the present invention along the length direction; Figure 13 Schematic diagram of an application scenario of the biological contact oxidation device provided in the embodiment of the present invention.

[0029] In the figure: 1 is the contact oxidation tank; 2, 2-A, 2-B are three-dimensional grid fillers; 3 is the air chamber member; 3a is the first air chamber wall; 3b is the second air chamber wall; 3c is the third air chamber wall; 3d is the air inlet hole; 3e is the air outlet hole; 3-1 is the air inlet pipe; 3-2 is the flow guide plate; 3-3 is the flow guide pipe; 4 is the sewage lift pump; 5 is the fine grille; 6 is the air supply device; 7 is the sedimentation tank; 8 is the disinfection tank. Detailed implementation manners

[0030] The core of the present invention is to provide a biological contact oxidation device, and the structural design of the biological contact oxidation device enables it to solve the problem that the filler and the aeration device are easily blocked, and extend the maintenance cycle of the filler and the aeration device.

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figure 1 and Figure 2 , Figure 1 is the structural schematic diagram of the biological contact oxidation device provided in the embodiment of the present invention, Figure 2 is the horizontal sectional view of the biological contact oxidation device provided in the embodiment of the present invention.

[0033] In an embodiment of the present invention, a biological contact oxidation device is disclosed. The biological contact oxidation device includes a contact oxidation tank 1, a three-dimensional grid filler 2, and an aeration device.

[0034] Among them, the contact oxidation tank 1 is a container for accommodating sewage for biochemical reactions. Therefore, the contact oxidation tank 1 should be made of corrosion-resistant materials, such as stainless steel, plastics (such as high-density polyethylene), carbon steel with anti-corrosion treatment on the surface, or reinforced concrete, etc.

[0035] The three-dimensional grid filler 2 is arranged in the contact oxidation tank 1, and the three-dimensional grid filler 2 is located below the highest sewage level of the contact oxidation tank 1. The three-dimensional grid filler 2 is a three-dimensional tubular structure in the vertical direction. The cross-section of the three-dimensional tubular structure includes but is not limited to a circle, an ellipse, and a polygon. The vertical direction refers to the direction perpendicular to or approximately perpendicular to the bottom of the contact oxidation tank 1. The three-dimensional grid filler 2 is a network structure composed of a plurality of three-dimensional tubular structures connected in the horizontal direction, that is, the cross-section of the three-dimensional grid filler 2 is a network structure. The three-dimensional grid filler can be a single whole or composed of a network structure rectangular module formed by connecting a plurality of identical three-dimensional tubular structures.

[0036] As Figure 3 and Figure 4 shown, in a specific embodiment of the present application, the cross-sectional shape of the three-dimensional tubular structure is a rectangle, and each three-dimensional tubular structure is closely arranged to form the three-dimensional grid filler 2.

[0037] In another embodiment, as Figure 5 and Figure 6 shown, the cross-sectional shape of the three-dimensional tubular structure is a circle, and the centers of the cross-sections of each three-dimensional tubular structure are arranged horizontally and vertically, and the cross-sections of adjacent two three-dimensional tubular structures are tangent to form the three-dimensional grid filler 2.

[0038] Of course, the above two cross-sectional shapes of the three-dimensional tubular structure are only specific implementation schemes provided by the present application, and are not actually limited thereto. In other embodiments, triangles, hexagons, etc. can also be used, and no limitation is made here.

[0039] To improve the sewage treatment effect, the gap between the three-dimensional grid filler 2 and the pool wall of the contact oxidation tank 1 should be minimized, that is, the three-dimensional grid filler 2 should be closely arranged on the plane to fill the entire contact oxidation tank 1 as much as possible, so as to avoid the bubbles generated by the aeration device from overflowing in the gap between the three-dimensional grid filler 2 and the contact oxidation tank 1 without passing through the three-dimensional grid filler 2.

[0040] The three-dimensional tubular structure is composed of multiple silk threads serving as microbial carriers that are bent, intertwined, and wound around each other. Micro-pore structures for water and air permeability are formed between the silk threads. During the operation of the biological contact oxidation device, microorganisms attach to the reticular surface of the three-dimensional grid packing 2. After the sewage flows through, the microorganisms degrade and assimilate the pollutants in the water, grow and apoptose continuously, and form a biofilm on the surface of the three-dimensional grid packing 2.

[0041] Please refer to Figure 7 and Figure 8 , the aeration device includes a plurality of air chamber members 3 arranged in the contact oxidation tank 1 and a gas supply device 6 connected to the air chamber members 3. The gas supply device 6 is located outside the contact oxidation tank 1, and the gas supply device 6 is communicated with the air chamber members 3 through pipelines.

[0042] In Figure 7 and Figure 8 In the illustrated embodiment, the air chamber member 3 adopts a trough-shaped structure with a notch at the bottom and closed in other directions, so that the air chamber member 3 can be arranged along the length direction or the width direction of the contact oxidation tank 1. That is, the air chamber member 3 is surrounded by a first air chamber wall 3a, two second air chamber walls 3b, and two third air chamber walls 3c. Among them, the first air chamber wall 3a is located at the top of the air chamber member 3, the two second air chamber walls 3b are respectively connected to the two side edges of the first air chamber wall 3a in the width direction, and the two third air chamber walls 3c are respectively connected to the two side edges of the first air chamber wall 3a in the length direction, thus enclosing an inverted trough-shaped structure with a notch at the bottom (the end far from the first air chamber wall 3a), and the notch of the air chamber member 3 faces the bottom of the contact oxidation tank 1.

[0043] At least one of the top, end, and side of the air chamber member 3 is provided with an air inlet hole 3d, that is, the air inlet hole 3d can be provided on at least one of the first air chamber wall 3a, the second air chamber wall 3b, and the third air chamber wall 3c. The gas supply device 6 is connected to the air inlet hole 3d through a pipeline to supply gas to the inside of the air chamber member 3. The gas generates bubbles through the air diffusion holes 3e, and the bubbles play a role in peeling off the aged microorganisms during the rising process, reducing the fouling of the three-dimensional grid packing 2.

[0044] Of course, it should be noted that the air chamber member 3 is not limited to the above trough-shaped structure and can also adopt other shapes. For example, the air chamber member 3 can adopt a circular structure, an elliptical structure, a triangular structure, a trapezoidal structure, etc., which are not limited here.

[0045] The air chamber member 3 is located below the three-dimensional grid packing 2. At least one side wall of the air chamber member 3 is provided with air diffusion holes 3e. The air diffusion holes 3e are preferably arranged corresponding to the three-dimensional tubular structure of the upper three-dimensional grid packing 2. In the specific embodiment of the present application, the aperture of the air diffusion holes 3e is 2 mm to 8 mm.

[0046] The biological contact oxidation device of the present invention can be used as a process unit for sewage treatment and as a biochemical treatment device. For example, Figure 13 As shown, after the sewage is lifted by the sewage lift pump 4 and enters the fine grille 5 to remove floating matters and suspended matters, it enters the biological contact oxidation device of the present invention, and the dissolved organic pollutants are removed through the biochemical reaction of microorganisms. To enhance the treatment effect, the biological contact oxidation devices in the present invention can be connected in series, that is, the bottoms of multiple contact oxidation tanks 1 are connected. The air supply device 6 provides the air source for aeration to the biological contact oxidation device. The treated sewage is collected at the end of the biological contact oxidation device and enters the sedimentation tank 7. After the biological film stripped by aeration is separated by sedimentation, the treated sewage enters the disinfection tank 8 for disinfection and then is discharged up to the standard.

[0047] During application, the microorganisms adhere to the net-like surface of the three-dimensional grid packing 2. After the sewage flows through, the microorganisms degrade and assimilate the pollutants in the water, grow and apoptose continuously, and form a layer of biological film on the surface of the packing. The thickness of the biological film increases continuously with the operation of the biological contact oxidation device, and the increasing speed is usually greater than the natural shedding speed. The air chamber member 3 intakes air from the intake hole 3d at the top. Under the action of pressure, the gas overflows from the aeration holes 3e on both sides of the air chamber member 3 to form bubbles and enter the contact oxidation tank 1. Since the position of the aeration holes is on the air chamber wall of the air chamber member 3, there will be no deposition and attachment of the shed biological film.

[0048] During the rising process of the bubbles, they enter the lumen of the three-dimensional tubular structure of the three-dimensional grid packing 2. It not only plays a role in stripping the biological film attached to the surface of the three-dimensional grid packing 2 through the gravity waves generated in the water during the rising process, but also directly contacts the inner lumen surface of the three-dimensional tubular structure of the three-dimensional grid packing 2 due to the horizontal oscillation during the rising process, and directly strips the outer layer of the biological film under the action of shear force.

[0049] During the rising process, the bubbles are also cut and fragmented by the filamentous polymer materials forming the microporous structure due to contact with the microporous structure of the tube wall of the three-dimensional tubular structure of the three-dimensional grid packing 2, and smaller-sized bubbles are formed during the rising process. Some of the smaller-sized bubbles enter the deep interior of the three-dimensional grid packing 2 for air washing and aeration of the deep layer of the three-dimensional grid packing 2, and the remaining smaller-sized bubbles are restricted to collide and merge into larger-sized bubbles in the inner lumen of the three-dimensional tubular structure, and continue to brush and oxygenate the three-dimensional grid packing 2 during the floating process until they reach the water surface and completely burst.

[0050] Since the three-dimensional grid packing 2 is composed of a network-structured rectangular module formed by splicing multiple three-dimensional tubular structures, the network-structured rectangular modules can be spliced seamlessly or with small gaps and fill the entire square-shaped biological contact oxidation tank 1. The biological contact oxidation tank 1 will not have large areas of packing vacancies, causing aeration to overflow upward from the vacant tank space and resulting in uneven aeration. The network-structured rectangular modules can also be stacked in multiple layers to increase the thickness of the three-dimensional grid packing 2, enhance the volume of the three-dimensional grid packing 2, and improve the treatment effect.

[0051] Compared with the prior art, in the biological contact oxidation device provided by the embodiment of the present invention, when the aeration volume increases, the biofilm shedding rate can increase to be greater than the biological growth rate, and when the aeration volume decreases, the biofilm shedding rate can be controlled within a range less than the biological growth rate. Since the functions of the biofilm growth rate and the shedding rate with respect to the aeration volume are both continuous, according to basic mathematical principles, there must be an aeration volume that can keep the biomass in the biofilm stable without growth or decay, that is, keep the biomass and never get blocked. At the same time, the structural designs of the three-dimensional grid packing 2 and the air chamber component 3 can effectively avoid the problem of easy blockage of the three-dimensional grid packing 2 and the aeration device, extend the cleaning and maintenance cycle of the three-dimensional grid packing 2 and the aeration device to be consistent with the life of the contact oxidation tank, so that the biological contact oxidation device does not require underwater maintenance and replacement and refurbishment operations of the three-dimensional grid packing 2 and the aeration device during the entire operation life cycle, reducing the operation and maintenance costs and equipment depreciation costs, and at the same time reducing the operation risk.

[0052] Preferably, in an embodiment of the present invention, the filament used for the three-dimensional tubular structure in the three-dimensional grid packing 2 is a high-molecular material fiber filament with a diameter of 0.5 mm to 5 mm. The high-molecular material fiber filaments are bent, wound, and intertwined with each other to form a three-dimensional spatial structure. The pore diameter of the microporous structure formed between the filaments for water permeability and air permeability is 1 mm to 10 mm, so as to effectively cut and break the passing bubbles, enabling the bubbles to enter the interior of the three-dimensional grid packing 2 and perform air washing and aeration on the deep layer of the three-dimensional grid packing 2.

[0053] Preferably, in an embodiment of the present invention, the high-molecular material fiber filament is made of high-density polyethylene (HDPE) material with strong weather resistance, and it will not age within the service life of the packing and will not have structural damage due to corrosion, oxidation, etc.

[0054] Preferably, in an embodiment of the present invention, the high-molecular material fiber filament is made of thermoplastic polyurethane elastomer (TPU) material. The TPU material has high tensile strength, low hardness, and high fracture deformation rate, and can shake under the action of air washing to promote the shedding of the aged biofilm attached to the packing and enhance the anti-fouling and anti-blocking ability of the pores of the packing.

[0055] The inner diameter of the three-dimensional tubular structure is 20 mm to 100 mm. It should be noted that the inner diameter refers to the hydraulic diameter. When the cross-sectional shape of the lumen of the three-dimensional tubular structure is circular, the inner diameter is equal to the diameter of the cross-section of the lumen of the three-dimensional tubular structure. When the cross-sectional shape of the lumen of the three-dimensional tubular structure is elliptical or polygonal, the inner diameter is equal to four times the cross-sectional area of the lumen of the three-dimensional tubular structure divided by the cross-sectional perimeter. Further, the inner diameter of the three-dimensional tubular structure is preferably 25 mm to 40 mm.

[0056] In one embodiment of the present invention, the center distance between two adjacent three-dimensional tubular structures is 25 mm to 120 mm. Further, the center distance between two adjacent three-dimensional tubular structures is preferably 30 mm to 50 mm.

[0057] As Figures 7 to 12 shown, in the specific embodiment provided by the present application, the air chamber member 3 is a groove-shaped structure with a notch at the bottom and closed in other directions. At least one of the top, end, and side of the air chamber member 3 is provided with an air inlet hole 3d, and an air inlet pipe 3-1 connected to the air supply device 6 is provided at the air inlet hole 3d.

[0058] As Figure 7 and Figure 8 shown, the air inlet hole 3d is provided at the top of the air chamber member 3, that is, the air inlet hole 3d is provided on the first air chamber wall 3a of the air chamber member 3, that is, the opening direction of the air inlet hole 3d is vertically downward. When the air flow provided by the air supply device 6 enters the inside of the air chamber member 3 through the air inlet pipe 3-1 and the air inlet hole 3d, the air bubbles are likely to overflow from the notch at the bottom of the air chamber member 3 and break the uniformity of aeration. To solve this problem, in the embodiment provided by the present application, a flow guiding device is provided inside the air chamber member 3. The flow guiding device is disposed opposite to the air inlet hole 3d, and / or the flow guiding device is communicated with the air inlet hole 3d. The flow guiding device is used to make the air flow output by the air supply device 6 flow in the air chamber member 3 in a preset direction.

[0059] Exemplarily, in the first embodiment of the present application, as Figure 8 shown, the flow guiding device is a flow guiding plate 3-2. The opposite side edges of the flow guiding plate 3-2 are connected to the opposite side air chamber walls of the air chamber member 3. In the illustrated embodiment, the opposite side edges of the flow guiding plate 3-2 are connected to two second air chamber walls 3b, and the flow guiding plate 3-2 is located below the air inlet hole 3d to change the flow direction of the air bubbles entering from the air inlet hole 3d, changing the air bubbles moving from top to bottom to flowing along the length direction of the air chamber member 3, thereby preventing the downward movement of the gas. In this way, under the combined action of the water pressure and the flow guiding plate, the gas will not directly overflow from the bottom of the air chamber member and break the uniformity of aeration.

[0060] In Figure 8In the illustrated embodiment, the flow deflector 3-2 is a flat plate, and this flat plate is perpendicular to the axis of the air inlet hole 3d. Although the flow deflector 3-2 of this structure can direct the airflow, since the flow deflector 3-2 is perpendicular to the axis of the air inlet hole 3d, it has a greater impact on the kinetic energy of the airflow, which is not conducive to the aeration of the aeration holes 3e at positions far from the air inlet hole 3d. To improve this situation, in the second embodiment of the present application, as Figure 9 shown, the flow deflector 3-2 includes two symmetrically arranged plate portions. The first ends of the two plate portions are connected to each other below the air inlet hole 3d, and the second ends of the two plate portions are away from each other. The plate portions are inclined in a direction away from the air inlet hole 3d starting from the first ends, so that the included angle between the two plate portions is 90° to 150°, and the distance between the second ends of the two plate portions in the horizontal direction is 3 to 10 times the diameter of the air inlet hole 3d. By arranging the flow deflector 3-3 below the air inlet hole 3d, the gas entering from the air inlet hole 3d will hit the tip formed by the first ends of the two plate portions downward, and thus the gas is divided and deflected by the flow deflector 3-2 into gases flowing to both sides along the length direction of the air chamber member 3, so as to prevent the gas from overflowing from the notch at the bottom of the air chamber member 3. The surface of the flow deflector 3-2 facing the air inlet hole 3d is an inclined surface, which can reduce the kinetic energy loss when the airflow hits the flow deflector 3-2 and make the airflow spread in a direction away from the air inlet hole 3d faster.

[0061] Of course, it should be noted that the flow guiding device is not limited to a plate-like structure. As Figure 10 shown, in the third embodiment of the present application, the flow guiding device is a multi-pass pipe structure, that is, the flow guiding device is a flow guiding pipe 3-3. The flow guiding pipe 3-3 includes an inlet pipe section and a plurality of outlet pipe sections. Each outlet pipe section is circumferentially and uniformly connected to the inlet pipe section around the inlet pipe section. One end of the inlet pipe section away from the outlet pipe section is connected to the air inlet hole 3d. The airflow of the air supply device 6 enters the inlet pipe section through the air inlet pipe 3-1 and then through the air inlet hole 3d. It is split into multiple strands through the inlet pipe section and enters each outlet pipe section respectively, and finally enters the air chamber member 3 through the outlet pipe section. In the present application, since the air chamber member 3 adopts a long strip-shaped groove structure, the flow guiding pipe 3-3 includes two outlet pipe sections. If the air chamber member adopts other structures, the number of outlet pipe sections of the flow guiding pipe 3-3 can be adjusted accordingly.

[0062] In Figure 10 the illustrated embodiment, the length of the inlet pipe section of the flow guiding pipe 3-3 is 50 mm to 100 mm, and the length of the outlet pipe section is not less than 2 times the diameter of the flow guiding pipe 3-3. Specifically, the length of the outlet pipe section is 50 mm to 100 mm.

[0063] In Figure 10 the illustrated embodiment, the axis of the inlet pipe section and the axis of the outlet pipe section satisfy the perpendicular condition, that is, the axis of the inlet pipe section is perpendicular or approximately perpendicular to the axis of the outlet pipe section.

[0064] Of course, the angle between the axis of the inlet pipe section and the axis of the outlet pipe section can be other angles. For example, the angle between the axis of the inlet pipe section and the axis of the outlet pipe section can be an obtuse angle, or the outlet pipe section can be an arc-shaped pipe to reduce the impact on the kinetic energy of the airflow.

[0065] Of course, if the installation position of the air inlet 3d is not from top to bottom but enters from the side of the air chamber member 3, then there is no need to set up a flow guiding device.

[0066] Such as Figure 11 and Figure 12 As shown, air inlet holes 3d are respectively arranged at both ends of the air chamber member 3, that is, air inlet holes 3d are respectively arranged on two third air chamber walls 3c of the air chamber member 3. In this way, the axis of the air inlet hole 3d is parallel to the length direction of the air chamber member 3, and the air flow enters the air chamber member 3 along the direction parallel to the length direction of the air chamber member 3. Therefore, there is no need to set up a flow guiding device inside the air chamber member 3.

[0067] And since the air chamber member 3 is usually located at the bottom of the contact oxidation tank 1, therefore in Figure 11 and Figure 12 In the shown embodiment, the inlet pipe 3-1 is a bent pipe, that is, the inlet end and the outlet end of the inlet pipe 3-1 are arranged at an angle.

[0068] Such as Figure 11 As shown, in the fourth embodiment of the present application, the inlet pipe 3-1 is a right-angle bent pipe, that is, the inlet pipe 3-1 includes a vertical pipe section and a horizontal pipe section. One end of the horizontal pipe section is connected to the vertical pipe section, and the other end of the horizontal pipe section is communicated with the air inlet hole 3d.

[0069] Such as Figure 12 As shown, in the fifth embodiment of the present application, the inlet pipe 3-1 is an arc-shaped bent pipe, and the inlet pipe 3-1 has a smooth curvature as a whole.

[0070] To further optimize the above technical solution, in the present application Figure 11 and Figure 12 In the shown embodiment, the horizontal distance between the center line of the inlet end of the inlet pipe 3-1 and the plane where the outlet end of the inlet pipe 3-1 is located is not greater than 0.5 times the center distance between adjacent two aeration holes 3e.

[0071] Preferably, in the present application Figure 7 In the shown embodiment, the distance between the outer wall surfaces of the two air chamber walls in the width direction of the air chamber member 3 is 20 mm to 100 mm, and the height from the top to the bottom is 100 mm to 250 mm. Further, the distance between the outer wall surfaces of the two air chamber walls of the air chamber member 3 is 30 mm to 50 mm, and the height from the top to the bottom is 150 mm to 200 mm. The length of the air chamber member 3 is less than the width of the contact oxidation tank 1, and the difference between the two is less than or equal to 3 times the center distance between adjacent two aeration holes 3e.

[0072] As shown Figures 7 to 12 in FIG., the air chamber wall of the air chamber member 3 is provided with one or more rows of air holes 3e. Each row of air holes 3e includes a plurality of air holes 3e arranged at intervals in the horizontal direction. The center distance between two adjacent air holes 3e in the same row is 30 mm to 300 mm, and the center distance between two adjacent air holes 3e in the same row is 1 to 5 times the center distance between two adjacent three-dimensional tubular structures. Further, preferably, the center distance between two adjacent air holes 3e in the same row is 4 times the center distance between two adjacent three-dimensional tubular structures.

[0073] Further, the air chamber wall of the air chamber member 3 is provided with multiple rows of air holes 3e. The adjacent two rows of air holes 3e are arranged in a staggered manner in the vertical direction. The height difference between the adjacent two rows of air holes 3e is greater than 5 times the aperture of the air hole 3e. And the aperture of the air holes 3e in the lower row of the adjacent two rows of air holes 3e is 1 mm to 3 mm larger than the aperture of the air holes 3e in the upper row, or 30% to 100% larger than the aperture of the air holes 3e in the upper row.

[0074] Preferably, in an embodiment of the present application, in the horizontal direction, the center distance between two adjacent air chamber members 3 is 100 mm to 500 mm, and the center distance between two adjacent air chamber members 3 is 2 to 6 times the center distance between two adjacent three-dimensional tubular structures. Further, preferably, the center distance between two adjacent air chamber members 3 is 4 times the center distance between two adjacent three-dimensional tubular structures.

[0075] In an embodiment of the present application, the gap between the three-dimensional grid packing 2 and the pool wall of the contact oxidation tank 1 is less than 1 / 2 of the inner diameter of the three-dimensional tubular structure, so as to make the gap between the three-dimensional grid packing 2 and the pool wall of the contact oxidation tank 1 as small as possible while facilitating the installation and placement of the three-dimensional grid packing 2.

[0076] It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0077] Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A biological contact oxidation device, characterized in that, Comprising: An aerobic contact tank (1); A three-dimensional grid packing (2), which is arranged in the aerobic contact tank (1). The three-dimensional grid packing (2) is a three-dimensional tubular structure in the vertical direction and a net structure composed of a plurality of the three-dimensional tubular structures connected in the horizontal direction. The three-dimensional tubular structure is formed by bending and intertwining a plurality of filamentary strips serving as microbial carriers. Micro-pore structures for water and air permeability are formed between the filamentary strips; An aeration device, which includes a plurality of air chamber members (3) arranged in the aerobic contact tank (1) and a gas supply device (6) connected to the air chamber members (3). The air chamber members (3) are located below the three-dimensional grid packing (2). At least one side wall of the air chamber of the air chamber member (3) is provided with air holes (3e), and the notch at the bottom of the air chamber member (3) faces the bottom of the aerobic contact tank (1).

2. The biological contact oxidation device according to claim 1, characterized in that The filamentary strips are high molecular material fiber filamentary strips with a diameter of 0.5 mm to 5 mm.

3. The biological contact oxidation device according to claim 2, characterized in that, The high molecular material fiber filamentary strips are made of high-density polyethylene or thermoplastic polyurethane elastomer.

4. The biological contact oxidation device according to claim 1, characterized in that, The aperture of the micro-pore structure is 1 mm to 10 mm.

5. The biological contact oxidation device according to claim 1, wherein, The inner diameter of the three-dimensional tubular structure is 20 mm to 100 mm.

6. The biological contact oxidation device according to claim 5, wherein, The center distance between two adjacent three-dimensional tubular structures is 25 mm to 120 mm.

7. The biological contact oxidation device according to any one of claims 1-6, characterized in that, The air chamber member (3) is a trough-shaped structure with a notch at the bottom and closed in the other directions. At least one of the top, end, and side of the air chamber member (3) is provided with an air inlet hole (3d), and an air inlet pipe (3-1) connected to the gas supply device (6) is provided at the air inlet hole (3d).

8. The biological contact oxidation device according to claim 7, characterized in that The top of the air chamber member (3) is provided with an air inlet hole (3d), and a flow guiding device is arranged inside the air chamber member (3). The flow guiding device is arranged opposite to the air inlet hole (3d), and / or the flow guiding device is communicated with the air inlet hole (3d). The flow guiding device is used to make the air flow output by the gas supply device (6) flow in the air chamber member (3) in a preset direction.

9. The biological contact oxidation device according to claim 8, wherein The flow guiding device is a flow guiding plate (3-2). The two opposite side edges of the flow guiding plate (3-2) are connected to the two opposite side walls of the air chamber of the air chamber member (3), and the flow guiding plate (3-2) is located below the air inlet hole (3d).

10. The biological contact oxidation device according to claim 9, characterized in that, The flow guiding plate (3-2) includes two symmetrically arranged plate parts. The first ends of the two plate parts are connected to each other below the air inlet hole (3d), and the second ends of the two plate parts are far away from each other. The plate parts are inclined in a direction away from the air inlet hole (3d) starting from the first ends, so that the included angle between the two plate parts is 90° to 150°, and the distance between the second ends of the two plate parts in the horizontal direction is 3 times to 10 times the diameter of the air inlet hole (3d).

11. The biological contact oxidation device according to claim 8, wherein The flow guiding device is a flow guiding pipe (3-3). The flow guiding pipe (3-3) includes an inlet pipe section and a plurality of outlet pipe sections. Each outlet pipe section is circumferentially and uniformly connected to the inlet pipe section, and one end of the inlet pipe section far away from the outlet pipe sections is connected to the air inlet hole (3d).

12. The biological contact oxidation device according to any one of claims 1-6, characterized in that, The distance between the outer wall surfaces of the two air chamber walls in the width direction of the air chamber member (3) is 20 mm to 100 mm, and the height from the top to the bottom is 100 mm to 250 mm. The length of the air chamber member (3) is less than the width of the contact oxidation tank (1), and the difference between the two is less than or equal to 3 times the center distance between two adjacent aeration holes (3e).

13. The biological contact oxidation device according to any one of claims 1-6, characterized in that, The aperture of the aeration hole (3e) is 2 mm to 8 mm.

14. The biological contact oxidation device according to any one of claims 1-6, characterized in that, One row or multiple rows of the aeration holes (3e) are arranged on the air chamber wall of the air chamber member (3). Each row of the aeration holes (3e) includes a plurality of the aeration holes (3e) arranged at intervals in the horizontal direction. The center distance between two adjacent aeration holes (3e) in the same row is 30 mm to 300 mm, and the center distance between two adjacent aeration holes (3e) in the same row is 1 to 5 times the center distance between two adjacent three-dimensional tubular structures.

15. The biological contact oxidation device according to claim 14, characterized in that, Multiple rows of the aeration holes (3e) are arranged on the air chamber wall of the air chamber member (3). The adjacent two rows of the aeration holes (3e) are arranged in a staggered manner in the vertical direction. The height difference between the adjacent two rows of the aeration holes (3e) is greater than 5 times the aperture of the aeration hole (3e), and the aperture of the lower row of the aeration holes (3e) in the adjacent two rows of the aeration holes (3e) is 1 mm to 3 mm larger than that of the upper row of the aeration holes (3e), or 30% to 100% larger than that of the upper row of the aeration holes (3e).

16. The biological contact oxidation device according to any one of claims 1-6, characterized in that, In the horizontal direction, the center distance between two adjacent air chamber members (3) is 100 mm to 500 mm, and the center distance between two adjacent air chamber members (3) is 2 to 6 times the center distance between two adjacent three-dimensional tubular structures.

17. The biological contact oxidation device according to any one of claims 1-6, characterized in that, The gap between the three-dimensional grid packing (2) and the pool wall of the contact oxidation tank (1) is less than 1 / 2 of the inner diameter of the three-dimensional tubular structure.

Images