MBBR aeration fluidization device

Abstract

The invention discloses an MBBR aeration fluidization device, and belongs to the technical field of sewage treatment equipment, the MBBR aeration fluidization device comprises a reaction tank and a microporous aeration system located at the bottom of the reaction tank, the microporous aeration system comprises a plurality of groups of microporous aeration pipelines arranged in parallel, the water outlet side of the reaction tank is provided with a plurality of water outlets, the plurality of water outlets are correspondingly provided with cylindrical water outlet intercepting nets which protrude towards the inside of the reaction tank; in the direction from the water inlet side of the reaction tank to the water outlet side of the reaction tank, the aeration density of the micropores in unit length is gradually increased, the micropore aeration disc is located under the water outlet interception net, and gas released by the micropore aeration disc is used for washing the filler accumulated on the upper water outlet interception net. According to the scheme, by designing the arrangement density of the micropore aeration density in the reaction tank and the relative position between the micropore aeration disc and the water outlet interception net, the water outlet interception net can be washed, and the problem of blockage of the water outlet interception net is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment equipment, and more particularly to an MBBR aeration and fluidization device. Background Art

[0002] MBBR technology is increasingly being used in wastewater treatment. By adding suspended biofilm carriers to the bio-tank, microorganisms are attached, improving the removal rate of pollutants from wastewater. To provide the oxygen required by microorganisms during the pollutant decomposition process, microporous aeration devices are required within the bio-tank. Furthermore, to ensure adequate fluidization of the suspended biofilm carriers, perforated aeration devices are also required within the bio-tank.

[0003] In the existing MBBR aeration tank, the arrangement of its microporous aeration device and perforated aeration device does not fully consider the factors affecting the direction of the internal water flow, and the following problems usually exist: (1) The MBBR filler will accumulate on the side of the aeration tank close to the outlet interception net as the inlet water flows, resulting in a continuous decrease in the proportion of MBBR filler close to the inlet section in the tank, which is not conducive to the uniformity of the fluidization of the MBBR filler in the aeration tank, and will also lead to insufficient microbial oxygen demand in the MBBR filler close to the outlet section, which is not conducive to the decomposition and treatment of sewage; (2) The MBBR filler accumulates on the side of the aeration tank close to the outlet interception net, affecting its water flow, and the inlet side of the outlet interception net also has the problem of reduced actual outlet hole area due to entanglement of fibrous materials.

[0004] The current traditional solution to the problem of MBBR filler accumulation in the outlet interception net is to increase the area and opening ratio of the outlet interception net to increase the water flow capacity of the outlet interception net, but this will cause a significant increase in equipment costs. In the existing technology, a flushing pipe is set on the side of the outlet interception net away from its water inlet to push the MBBR filler toward its water inlet direction to solve the technical problem of MBBR filler accumulation in the outlet interception net, thereby increasing the water flow capacity of the outlet interception net. However, this backwashing or backwashing mechanism for clearing blockage in the outlet interception net has a relatively complex structure and mainly clears blockages on the outlet side of the outlet interception net, so its clearing capacity is limited.

[0005] For example, the Chinese patent with publication number CN222226076U discloses an MBBR effluent filler interception device, which specifically includes an interception net with a cylindrical structure, a mesh provided on the interception net, and an aeration pipe connected to the interception net. This application sets an aeration pipe in the interception net with a cylindrical structure. When the flow rate inside the interception net is detected to be reduced or reaches the set aeration time node, one or more aerations will be released into the interception net instantly, so that the pressure in the interception net will increase instantly, thereby dispersing the filler accumulated on the outside of the interception net, so that the filler is separated from the interception net, avoiding the blockage problem caused by the accumulation of filler, and allowing the accumulated filler to re-enter the biochemical system and flow, thereby improving the filler's ability to treat sewage in the biochemical system. Although this application can solve the problem of frequent blockage of the effluent interception net by periodic aeration for clearing blockage, its structure is relatively complex and the clearing effect needs to be further improved.

[0006] Existing research also includes adding cleaning equipment to the outlet side of the water interception net, and using a brush to clean the outlet side of the water interception grille. However, its structure is also relatively complex, and the cleaning equipment itself requires a certain amount of space, thereby reducing the actual water flow area of the water interception grille. Summary of the Invention

[0007] 1. Technical problems to be solved To address the technical issue of MBBR packing easily accumulating on the effluent interception net, the present invention provides an MBBR aeration and fluidization device. By designing the distribution of microporous aeration pipes within the reaction tank and the relative positioning of the microporous aeration discs and the effluent interception net, this solution not only uses the microporous aeration pipes to supply oxygen to the reaction tank and fluidize the packing, but also flushes the effluent interception net, effectively resolving the effluent interception net clogging issue.

[0008] 2. Technical solutions adopted In order to achieve the above object, the technical solution provided by the present invention is: An MBBR aeration and fluidization device according to the present invention comprises a reaction tank, wherein fillers and a microporous aeration system are provided inside the reaction tank. The microporous aeration system is located at the bottom of the reaction tank and comprises a plurality of parallel and spaced microporous aeration pipes. A water outlet side of the reaction tank is provided with a plurality of water outlets spaced along its width, and each of the plurality of water outlets is provided with a cylindrical water outlet interception net protruding toward the interior of the reaction tank. The microporous aeration pipes are provided with a plurality of microporous aeration disks, which are arranged unevenly. The microporous aeration disks have a gradually increasing microporous aeration density per unit length from the water inlet side toward the water outlet side of the reaction tank. The microporous aeration disks are located directly below the water outlet interception net, and the gas released by the microporous aeration disks is used to flush the fillers accumulated on the water outlet interception net.

[0009] Furthermore, the microporous aeration disk is a disc-shaped membrane type, and the overlapping area of the effluent interception net and the microporous aeration disk directly below it in the top projection is approximately 45~60% of the area of the effluent interception net, and the distance between the bottom end of the effluent interception net and the top end of the microporous aeration disk along the height direction of the reaction tank is 0.5~1.5m.

[0010] Furthermore, an auxiliary fluidization system is provided inside the reaction tank. The auxiliary fluidization system is located above or below the microporous aeration system and includes several groups of parallel and spaced perforated aeration pipes. The perforated aeration pipes are provided with multiple perforated aeration holes. The auxiliary fluidization system extends from directly below the end of the effluent interception net away from the effluent side of the reaction tank toward the effluent side of the reaction tank. The distance between the auxiliary fluidization systems on both sides along the length of the reaction tank is 1 / 2 to 2 / 3 of the length of the tank body.

[0011] Furthermore, the perforated aeration holes in the auxiliary fluidized bed system are arranged non-uniformly, and the density of the perforated aeration holes arranged per unit length gradually decreases from the outlet side of the reaction tank toward the inlet side thereof.

[0012] Furthermore, the perforated aeration holes in the auxiliary fluidized bed system are evenly arranged along the outlet side of the reaction tank toward the inlet side thereof.

[0013] Furthermore, the perforated aeration pipe is provided with perforated aeration holes with a hole diameter of 1 to 10 mm. The perforated aeration holes are arranged downwardly with the angle between the center line and the vertical direction being 30 to 45 degrees, and are symmetrically arranged on both sides of the axis of the perforated aeration pipe.

[0014] Furthermore, an air knife flushing system is provided inside the reaction tank. The air knife flushing system is arranged close to the outlet side of the reaction tank and is located directly below the outlet interception net, and is located between the microporous aeration system and the outlet interception net along the height direction of the reaction tank.

[0015] Furthermore, the air knife flushing system includes a plurality of groups of air knife aeration pipes arranged in parallel, and the air knife aeration pipes are provided with air knife air outlet holes with a diameter of 1 to 8 mm, and the air knife air outlet holes are arranged obliquely downward.

[0016] Furthermore, a water inlet is provided on the water inlet side of the reaction tank, and the water inlet is provided with a water inlet intercepting net protruding toward the inside of the reaction tank. The water inlet intercepting net includes an intercepting net body and a hinged door panel. One side of the hinged door panel is hingedly installed on the top of the intercepting net body. The hinged door panel can rotate toward the outside relative to the intercepting net body. The intercepting net body is provided with an opening corresponding to the hinged door panel, and the opening is smaller than the hinged door panel, which is used to limit the rotation of the hinged door panel toward the inside of the intercepting net body.

[0017] Furthermore, the water inlet intercepting net is a rectangular parallelepiped; the hinged door panel is hingedly installed on the top of the intercepting net body through hinges.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: (1) The present invention optimizes the arrangement density of the microporous aeration pipes inside the reaction tank. Specifically, the microporous aeration density formed by the microporous aeration disks per unit length gradually increases from the water inlet side of the reaction tank toward the water outlet side. This non-uniform arrangement of the microporous aeration pipes is more consistent with the distribution density of the filler in the tank, thereby meeting the oxygen demand for normal metabolism of microorganisms. In addition, the positive and negative gas-liquid pressures along the length of the reaction tank form a circulating hydraulic state in the tank, making the MBBR filler easier to fluidize, which is beneficial to the uniformity of the filler fluidization in the tank. More importantly, by optimizing the relative position of the microporous aeration pipes and the outlet interception net, specifically, a microporous aeration disk is provided below the outlet interception net, forming a high-density aeration area at the lower end of the outlet interception net, which can form a planar "air-water knife" effect on the outlet interception net above it, so as to strongly flush the surface of the outlet interception net, avoid the outlet interception net being affected by the accumulation of filler, and can use the filler to clean the outlet interception net.

[0019] (2) The present invention further adds an auxiliary fluidization system and optimizes its layout position inside the reaction tank. Specifically, one end of the auxiliary fluidization system extends from directly below the end of the effluent interception net away from the effluent side toward the inlet side of the reaction tank. The distance between the auxiliary fluidization systems on both sides along the length of the reaction tank is 1 / 2 to 2 / 3 of the length of the reaction tank body. On the basis of the microporous aeration system, the uniformity of the fluidization of the filler inside the reaction tank is further improved. Furthermore, from the effluent side of the reaction tank toward its inlet side, the perforated aeration density formed by the perforated aeration holes per unit length gradually decreases, thereby further improving the uniformity of the fluidization of the filler inside the reaction tank. In addition, an air knife flushing system is added directly below the effluent interception net to further prevent the MBBR filler from locally accumulating on the effluent interception net and to flush the biological colonies growing on the effluent interception net. Through the combination of the above-mentioned microporous aeration system, auxiliary fluidization system and auxiliary fluidization system, the synergistic gain of multiple technical means is achieved, the operating stability and treatment efficiency of the MBBR system are significantly improved, and the frequency of manual cleaning is reduced.

[0020] (3) The present invention further optimizes the design of the water inlet intercepting net at the water inlet of the reaction tank. Specifically, it includes an intercepting net body and a hinged door panel, one side of which is hingedly mounted on the top of the intercepting net body. When the water inlet intercepting net is blocked, the hinged door panel moves upward relative to the intercepting net body under the action of water pressure, that is, the hinged door panel rotates toward the outside of the intercepting net body, so that the blockage inside the intercepting net body, such as sewage, silted debris, fibrous woven fabrics or backflow fillers, flows into the interior of the reaction tank through the opening at the top of the intercepting net body, and is decomposed by microorganisms in the reaction tank. The device of the invention effectively prevents the blockage of the water inlet and outlet of the reaction tank by optimizing the design of both the water inlet intercepting net and the water outlet intercepting net, and further reduces the frequency of manual underwater cleaning. When the water in the water inlet intercepting net can flow normally, the hinged door panel will move downward under the influence of gravity and cover the opening of the intercepting net body to prevent the sewage inside the reaction tank from flowing back into the interior of the intercepting net body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the top structure of the MBBR aeration fluidization device according to an embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional schematic diagram of the water inlet interception net in the MBBR aeration and fluidization device according to an embodiment of the present invention.

[0023] Figure 3 Schematic cross-sectional view of a perforated air inlet branch pipe in an MBBR aeration and fluidization device according to an embodiment of the present invention.

[0024] Description of labels: 1. Reaction tank; 101. Water inlet; 102. Water outlet; 2. Microporous aeration system; 201. Microporous aeration inlet; 202. Microporous aeration main pipe; 203. Microporous aeration branch pipe; 204. Microporous aeration disk; 3. Auxiliary fluidization system; 301. Perforated aeration inlet; 302. Perforated air inlet main pipe; 303. Perforated air inlet branch pipe; 304. Perforated aeration hole; 4. Air knife flushing system; 401. Air knife air inlet main pipe; 402. Air knife air inlet branch pipe; 403. Air knife air outlet; 5. Water inlet interception net; 501. Hinged door panel; 502. Interception net body; 503. Hinge; 6. Water outlet interception net. DETAILED DESCRIPTION

[0025] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0026] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology. They are not used to limit the conditions for implementation of the present invention and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0027] Regarding the explanation of direction, the existing reaction tank 1 is generally a rectangular parallelepiped, and its water inlet side and water outlet side are generally selected as two opposite sides that are farther apart. Therefore, the direction of the line connecting the water inlet side and the water outlet side of the reaction tank 1 is called the length direction of the reaction tank 1. The water flow direction referred to in the following embodiments also refers to the direction from the water inlet side of the reaction tank 1 to its water outlet side. The width direction of the reaction tank 1 refers to the horizontal direction perpendicular to the length direction of the reaction tank 1. The width direction and the length direction of the reaction tank 1 together constitute a horizontal plane, and the height direction of the reaction tank 1 is also called the depth direction, which is perpendicular to the horizontal plane jointly constituted by the width direction and the length direction of the reaction tank 1. The overhead projection referred to in the present invention refers to the projection direction from the top of the reaction tank 1 along its depth direction toward the bottom of the reaction tank 1.

[0028] This embodiment provides an MBBR aeration fluidization device, referring to Figure 1 As shown, it includes a reaction tank 1 and a microporous aeration system 2. The interior of the reaction tank 1 is provided with fillers and the microporous aeration system 2. The microporous aeration system 2 is located at the bottom of the reaction tank 1 and includes several groups of parallel and spaced microporous aeration pipes. The outlet side of the reaction tank 1 is provided with multiple water outlets 102 spaced along its width direction. The multiple water outlets 102 are each corresponding to a cylindrical outlet interception net 6 protruding toward the interior of the reaction tank 2; a plurality of microporous aeration disks 204 are provided on the microporous aeration pipe, and the microporous aeration disks 204 are arranged unevenly. From the water inlet side of the reaction tank 1 toward its outlet side, the microporous aeration density set per unit length gradually increases; the microporous aeration disks 204 are located directly below the outlet interception net 6, and the gas released by the microporous aeration disks 204 is used to flush the fillers accumulated on the upper outlet interception net 6.

[0029] As a preferred embodiment of the uneven arrangement of microporous aeration pipes, the microporous aeration system 2 includes a microporous aeration main pipe 202 and a plurality of microporous aeration branch pipes 203 located at the bottom of the reaction tank 1. The microporous aeration main pipe 202 is arranged along the width direction of the reaction tank 1. A microporous aeration inlet 201 is provided in the microporous aeration main pipe 202. The microporous aeration main pipe 202 also includes a microporous aeration inlet pipe arranged near the inner wall of the reaction tank 1. A single microporous aeration inlet pipe extends along the depth direction of the reaction tank 1. Gas is injected into the microporous aeration main pipe 202 through the microporous aeration inlet 201 through the microporous aeration inlet pipe. The plurality of microporous aeration branch pipes 203 are connected to the microporous aeration main pipe 202 by pipes and are arranged in a cross shape. The plurality of microporous aeration branch pipes 203 are parallel and spaced apart along the length direction of the reaction tank 1. The single microporous aeration branch pipe 203 extends along the width direction of the reaction tank 1. Along the length of the reaction tank 1, the number of microporous aeration branches 203 per unit length gradually increases. The microporous aeration main pipe 202 is equipped with corresponding insertion holes for the microporous aeration branches 203, and each microporous aeration branch 203 is provided with evenly spaced microporous aeration disks 204. The microporous aeration density created by the microporous aeration disks 204 gradually increases from the water inlet side to the water outlet side of the reaction tank 1. In other words, along the length of the reaction tank 1, simply by adjusting the number of microporous aeration branches 203 per unit length, a non-uniform arrangement of microporous aeration pipes can be achieved at the bottom of the reaction tank 1.

[0030] Preferably, the distance between the bottom end of the microporous aeration system 2 and the bottom surface of the reaction tank 1 is 200-350 mm.

[0031] It should be noted that the non-uniform arrangement of the micropore aeration density along the direction from the water inlet side to the water outlet side of the reaction tank 1 can also be achieved through other methods.

[0032] Regarding the further supplement of the background of the present invention, sewage treatment generally needs to go through a plurality of continuous processes, and these processes are carried out separately in a plurality of reaction tanks separated from each other, and a plurality of reaction tanks are connected only by a water inlet and a water outlet. The MBBR reaction tank is generally located in the reaction tank of the middle process of sewage treatment, and its water inlet and water outlet are connected to other reaction tanks, so it is inconvenient to clean it manually. In some MBBR reaction tanks with a large pool depth and an outlet intercepting net 6 arranged near the bottom of the reaction tank, when the outlet intercepting net 6 is blocked, it is necessary to manually wear a diving suit to perform underwater operations to complete the cleaning of the outlet intercepting net 6, which is more expensive.

[0033] It should be noted that the present invention designs the density of microporous aeration arrangement within the reaction tank 1 and the relative position between the microporous aeration disk 204 and the water outlet interception net 6. Specifically, by extending the microporous aeration disk 204 to directly below the water outlet interception net 6, the aeration area of a single microporous aeration disk 204 is larger and the air outlet is more concentrated compared to the perforated aeration holes of a single perforated aeration or the air knife outlet holes of an air knife flushing. During aeration, a planar "air-water knife" effect can be formed on the water outlet interception net 6 above it, thereby strongly flushing the surface of the water outlet interception net 6. Due to the limitation of the upward path of bubbles, the existing combination of a planar interception net and a microporous aeration disk 204 located at the water outlet of the reaction tank 1, or the combination of perforated aeration holes and a cylindrical water outlet interception net, cannot achieve the above-mentioned effect of strongly flushing the water outlet interception net 6. By strongly flushing the water outlet interception net 6, the filler accumulated on the water outlet interception net 6 is dispersed. During the packing dispersion process, due to its relatively hard material, it rubs against the fibrous debris attached to the outlet interception net 6, wiping away the accumulated fibrous debris, thereby cleaning the outlet interception net 6. Furthermore, the microporous aeration pipes are arranged in a gradually denser pattern from the inlet side to the outlet side of the reaction tank 1. This, on the one hand, aligns with the density of the packing in the reaction tank 1, thereby better providing oxygen for the metabolism of microorganisms within the packing. On the other hand, the end near the outlet side of the reaction tank 1 uses hydraulic flow to push the packing away from the outlet interception net 6 and toward the inlet side of the reaction tank 1, thereby achieving uniform fluidization of the packing within the tank.

[0034] Furthermore, the present invention adopts microporous aeration to strengthen gas-liquid contact through microbubbles, thereby improving the oxygenation efficiency in the reaction tank, thereby facilitating the metabolism of pollutants in sewage by microorganisms.

[0035] During actual application, the device of the present invention can clean the outlet interception net 6 very well, simply and efficiently solves the technical problem of blockage of the outlet interception net 6 that has been plaguing the industry, greatly reduces the frequency of manual underwater cleaning, and greatly reduces the equipment operation and maintenance costs of the sewage reaction tank.

[0036] The water outlets 102 are preferably evenly spaced in the width direction of the reaction tank 1 , and only two are shown in the figure. In order to facilitate the observation of other components, the remaining water outlets 102 are not shown.

[0037] Specifically, the microporous aeration disk 204 is a disc-shaped membrane. The overlapping area of the effluent interception net 6 and the microporous aeration disk 204 directly below it, when projected from above, is approximately 45-60% of the area of the effluent interception net 6. Furthermore, the distance between the bottom of the effluent interception net 6 and the top of the microporous aeration disk 204 along the height of the reaction tank 1 is 0.5-1.5 meters. These technical parameters provide a superior "air-water knife" effect.

[0038] The distribution density of the pores in the microporous aeration disk 204 is very high, and there are a large number of pores per unit area. The microporous aeration disk 204 simultaneously releases a large number of bubbles to form an aeration surface, thereby surface-scouring the outlet interception net 6 directly above.

[0039] As a preferred embodiment, an auxiliary fluidization system 3 is further provided inside the reaction tank 1. The auxiliary fluidization system 3 is located above or below the microporous aeration system 2. The auxiliary fluidization system 3 includes several groups of parallel and spaced perforated aeration pipes. The perforated aeration pipes are provided with multiple perforated aeration holes 304. The auxiliary fluidization system 3 extends from directly below the end of the effluent interception net 6 away from the effluent side toward the water inlet side of the reaction tank 1. The distance between the auxiliary fluidization systems 3 on both sides along the length direction of the reaction tank 1 is 1 / 2 to 2 / 3 of the length of the reaction tank 1.

[0040] The perforated aeration holes 304 in the auxiliary fluidization system 3 continuously discharge gas to form continuous aeration.

[0041] refer to Figure 1 As shown, one end of the auxiliary fluidization system 3 is located directly below the end of the effluent interception net 6 away from the effluent side of the reaction tank 1, and the other end is located approximately in the middle of the reaction tank 1. The distance between the auxiliary fluidization systems 3 on both sides along the length direction of the reaction tank 1 is preferably 1 / 2 of the length of the reaction tank 1.

[0042] Further preferably, the perforated aeration pipes in the auxiliary fluidized bed system 3 are arranged non-uniformly, and the density of the perforated aeration pipes arranged per unit length gradually decreases from the outlet side of the reaction tank 1 toward the inlet side thereof.

[0043] As a preferred embodiment of the auxiliary fluidization system 3, refer to Figure 1 As shown, the auxiliary fluidization system 3 includes a perforated air inlet main pipe 302 and multiple perforated air inlet branch pipes 303. Preferably, the perforated air inlet main pipe 302 extends along the length of the reaction tank 1 and is located in the middle thereof. A perforated aeration air inlet 301 is provided at one end of the perforated air inlet main pipe 302, near the water outlet 102 of the reaction tank 1. The perforated air inlet main pipe 302 and the multiple perforated air inlet branch pipes 303 are interconnected and arranged in a cross-shaped pattern. The multiple perforated air inlet branch pipes 303 are arranged in parallel and spaced apart along the length of the reaction tank 1, and a single perforated air inlet branch pipe 303 extends along the width of the reaction tank 1. From the water outlet side of the reaction tank 1 toward the water inlet side, the number of perforated air inlet branch pipes 303 per unit length gradually decreases. The perforated air inlet main pipe 302 is provided with corresponding sockets for the perforated air inlet branch pipes 303, and each perforated air inlet branch pipe 303 is provided with evenly spaced perforated aeration holes 304. That is, from the outlet side toward the inlet side of the reaction tank 1 , the perforated aeration pipes can be arranged non-uniformly on the bottom of the reaction tank 1 simply by adjusting the number of perforated air inlet branches 303 provided per unit length.

[0044] It should be noted that the non-uniform arrangement of the perforated aeration density along the direction from the water inlet side to the water outlet side of the reaction tank 1 can also be achieved through other methods.

[0045] The auxiliary fluidization system 3 is provided to push the filler toward the water inlet side of the reaction tank 1 , and on the basis of the fluidization of the filler by the microporous aeration system 2 , the uniformity of the overall fluidization of the filler in the tank is further improved.

[0046] More preferably, in some embodiments, the perforated aeration pipes in the auxiliary fluidization system 3 may be evenly arranged along the outlet side of the reaction tank 1 toward the inlet side thereof.

[0047] As an expansion plan, refer to Figure 3 As shown, the perforated aeration pipe is provided with perforated aeration holes 304 with a diameter of 1 to 10 mm. The perforated aeration holes 304 are tilted downward, and the angle between the center line and the vertical direction is 30 to 45 degrees. The perforated aeration holes 304 are symmetrically arranged on both sides of the axis of the perforated aeration pipe.

[0048] It should be noted that the optimized design of the angles of the perforated aeration holes 304 prevents sludge and debris from falling into the perforated aeration holes 304 when the system is suspended or when the perforated aeration tubes are not aerating, thereby preventing clogging of the perforated aeration holes 304. Clogged perforated aeration holes 304 would result in high local agitation intensity within the reaction tank 1. Furthermore, by preventing sludge and debris from falling into the perforated aeration holes 304, the lifespan of the auxiliary fluidization system 3 is extended.

[0049] As a further development solution, the vertical angle of the central axis of the perforated aeration hole 304 is 45°.

[0050] As a further preference for any of the above embodiments, an air knife flushing system 4 is also provided inside the reaction tank 1. The air knife flushing system 4 is arranged close to the outlet side of the reaction tank 1 and is located directly below the outlet interception net 6. It is also located between the microporous aeration system 2 and the outlet interception net 6 along the height direction of the reaction tank 1.

[0051] Regarding the positional relationship between the air knife flushing system 4 and the auxiliary fluidization system 3, the air knife flushing system 4 can be located above or below the auxiliary fluidization system 3. Figure 1 As shown, the air knife flushing system 4 is located above the auxiliary fluidization system 3, which is one of the feasible implementations of the present invention. Other feasible implementations are not shown in the figure.

[0052] The relationship between the gas outlet intensities of a single pore in the microporous aeration plate 204 , the perforated aeration hole 304 and the single pore in the air knife flushing system 4 is as follows: a single pore in the microporous aeration plate 204 is smaller than the perforated aeration hole 304 , and the perforated aeration hole 304 is smaller than the air knife flushing system 4 .

[0053] Among them, the air knife flushing system 4 provides a strong flushing effect, which can not only blow away the fillers accumulated on the water outlet interception net 6 and improve the circulation fluidity of the fillers, but also flush the biological colonies accumulated on the water outlet interception net 6, solving the current problem that the water outlet interception net 6 is easy to grow biofilm and difficult to clean.

[0054] As a preferred embodiment of the air knife flushing system 4, it includes an air knife air inlet main pipe 401 and at least two sets of parallel and spaced air knife air inlet branches 402. The air knife air inlet main pipe 401 extends along the length of the reaction tank 1 and is located in the middle of the reaction tank 1. The air knife air inlet main pipe 401 is provided with an air knife aeration air inlet perforated air inlet main pipe 302 and multiple perforated air inlet branches 303, which are interconnected and arranged in a cross shape. Multiple air knife air inlet branches 402 are spaced along the length of the reaction tank 1, and a single air knife air inlet branch 402 extends along the width of the reaction tank 1. Air knife air outlet holes 403 are evenly distributed on the air knife air inlet branch pipe 402.

[0055] It should be noted that the arrangement of the air knife flushing system 4 can also be achieved in other ways.

[0056] Further preferably, reference Figure 1 As shown, the air knife flushing system 4 includes several groups of air knife aeration pipes arranged in parallel, and the air knife aeration pipes are provided with air knife outlet holes 403 with an aperture of 1 to 8 mm. The air knife outlet holes 403 are arranged obliquely downward. Further preferably, the angle between the center line of the air knife outlet holes 403 and the vertical direction is 30 to 45 degrees, and they are staggered on both sides of the air knife aeration pipe along the axial direction of the air knife aeration pipe.

[0057] It should be noted that the opening angle of the air knife outlet 403 is designed to be inclined upward, which can also prevent the air hole from being blocked and prolong the service life. More preferably, the angle between the central axis of the air knife outlet 403 and the vertical direction is 45°.

[0058] The air knife outlet 403 in the air knife flushing system 4 continuously discharges air to form continuous air knife flushing.

[0059] In order to further solve the problem of blockage on the water inlet side of the reaction tank 1, a water inlet 101 is opened on the water inlet side of the reaction tank 1, and the water inlet 101 is provided with a water inlet intercepting net 5 protruding toward the inside of the reaction tank 2. The water inlet intercepting net 5 includes an intercepting net body 502 and a hinged door panel 501. One side of the hinged door panel 501 is hingedly installed on the top of the intercepting net body 502. The hinged door panel 501 can rotate toward the outside of the intercepting net body 502 relative to the intercepting net body 502. The intercepting net body 502 is provided with an opening corresponding to the hinged door panel 501, and the opening is smaller than the hinged door panel 501, which is used to limit the hinged door panel 501 from rotating toward the inside of the intercepting net body 502. The intercepting net body 502 and the hinged door panel 501 enclose a water inlet intercepting net 5.

[0060] The water inlet intercepting net 5 is designed to be split, specifically, it includes an intercepting net body 502 and a hinged door panel 501, one side of the hinged door panel 501 is hingedly mounted on the top of the intercepting net body 502. Figure 2 As shown in (a), when the water inlet interception net 5 is blocked, that is, when the interior of the interception net body 502 is blocked, the liquid level inside it is higher than the liquid level inside the reaction tank 1. Under the action of water pressure, the hinged door plate 501 moves upward relative to the interception net body 502, that is, the hinged door plate 501 rotates toward the outside of the interception net body 502, so that the blockage inside the interception net body 502, such as sewage, silted debris, fibrous woven fabrics and backflow fillers, flows into the reaction tank 1 through the opening at the top of the interception net body 502 and is decomposed by the microorganisms in the reaction tank 1. Figure 2 As shown in (b), when water can flow normally inside the water inlet interception net 5, the hinged door panel 501 will move downward under the influence of gravity, covering the opening of the interception net body 502 to prevent the sewage inside the reaction tank 1 from flowing back into the interior of the interception net body 502.

[0061] The inventive device effectively prevents the blockage of the water inlet 101 and the water outlet 102 in the reaction tank 1 through the comprehensive design of the water inlet interception net 5 and the water outlet interception net 6, further reducing the frequency of manual underwater cleaning.

[0062] As an extension solution, the water inlet interception net 5 is a rectangular parallelepiped; the hinged door panel 501 is hingedly mounted on the top of the interception net body 502 via a hinge 503. One end of the hinge 503 is mounted on the interception net body 502, and the other end is mounted on the hinged door panel 501.

[0063] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. An MBBR aeration and fluidization device, comprising a reaction tank (1), wherein a filler and a microporous aeration system (2) are provided inside the reaction tank (1), wherein the microporous aeration system (2) is located at the bottom of the reaction tank (1) and comprises a plurality of groups of microporous aeration pipes arranged in parallel and spaced apart, and wherein: The outlet side of the reaction tank (1) is provided with a plurality of outlets (102) spaced apart along the width direction thereof, and each of the plurality of outlets (102) is provided with a cylindrical outlet interception net (6) protruding toward the interior of the reaction tank (2); a plurality of microporous aeration disks (204) are provided on the microporous aeration pipe, and the microporous aeration disks (204) are arranged non-uniformly, and the microporous aeration density provided within a unit length gradually increases from the water inlet side toward the water outlet side of the reaction tank (1); the microporous aeration disks (204) are located directly below the outlet interception net (6), and the gas released by the microporous aeration disks (204) is used to flush the filler accumulated on the outlet interception net (6).

2. The MBBR aeration fluidization device according to claim 1, characterized in that: The microporous aeration disk (204) is a disc-shaped membrane type. The overlapping area of the outlet interception net (6) and the microporous aeration disk (204) directly below it in a top-view projection is approximately 45% to 60% of the area of the outlet interception net (6). The distance between the bottom end of the outlet interception net (6) and the top end of the microporous aeration disk (204) along the height direction of the reaction tank (1) is 0.5 to 1.5 m.

3. The MBBR aeration fluidization device according to claim 1, characterized in that: An auxiliary fluidization system (3) is further provided inside the reaction tank (1). The auxiliary fluidization system (3) is located above or below the microporous aeration system (2), and comprises a plurality of parallel and spaced perforated aeration pipes, each of which is provided with a plurality of perforated aeration holes (304). The auxiliary fluidization system (3) extends from just below one end of the outlet interception net (6) away from the outlet side of the reaction tank (1) toward the inlet side of the reaction tank (1). The distance between the auxiliary fluidization systems (3) on both sides along the length direction of the reaction tank (1) is 1 / 2 to 2 / 3 of the length of the tank body.

4. The MBBR aeration and fluidization device according to claim 3, characterized in that: The perforated aeration holes (304) in the auxiliary fluidized system (3) are arranged non-uniformly, and the perforated aeration density arranged per unit length gradually decreases from the outlet side of the reaction tank (1) toward the inlet side thereof.

5. The MBBR aeration fluidization device according to claim 3, characterized in that: The perforated aeration holes (304) in the auxiliary fluidized system (3) are evenly arranged along the outlet side of the reaction tank (1) toward the inlet side thereof.

6. The MBBR aeration and fluidization device according to claim 3, characterized in that: The perforated aeration pipe is provided with perforated aeration holes (304) with a hole diameter of 1-10 mm. The perforated aeration holes (304) are arranged downwardly inclined, and the angle between the center line and the vertical direction is 30-45 degrees. The perforated aeration holes (304) are staggered and symmetrically arranged on both sides of the perforated aeration pipe along the axis direction of the perforated aeration pipe.

7. The MBBR aeration fluidization device according to any one of claims 1 to 6, characterized in that: An air knife flushing system (4) is further provided inside the reaction tank (1). The air knife flushing system (4) is arranged close to the outlet side of the reaction tank (1) and is located directly below the outlet interception net (6). The air knife flushing system (4) is located between the microporous aeration system (2) and the outlet interception net (6) along the height direction of the reaction tank (1).

8. The MBBR aeration and fluidization device according to claim 7, characterized in that: The air knife flushing system (4) comprises a plurality of groups of air knife aeration pipes arranged in parallel, each of which is provided with an air knife outlet hole (403) with a diameter of 1 to 8 mm, and the air knife outlet hole (403) is arranged to be inclined downward.

9. The MBBR aeration and fluidization device according to claim 8, characterized in that: The reaction tank (1) is provided with a water inlet (101) on the water inlet side. The water inlet (101) is provided with a water inlet interception net (5) protruding toward the interior of the reaction tank (2). The water inlet interception net (5) comprises an interception net body (502) and a hinged door panel (501). One side of the hinged door panel (501) is hingedly mounted on the top of the interception net body (502). The hinged door panel (501) can rotate relative to the interception net body (502) toward the outside thereof. The interception net body (502) is provided with an opening corresponding to the hinged door panel (501), and the opening is smaller than the hinged door panel (501), and is used to limit the hinged door panel (501) from rotating toward the interior of the interception net body (502).

10. The MBBR aeration and fluidization device according to claim 9, characterized in that: The water inlet intercepting net (5) is a rectangular parallelepiped; the hinged door panel (501) is hingedly mounted on the top of the intercepting net body (502) via a hinge (503).

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