Building construction sewage treatment system

Abstract

The invention belongs to the technical field of sewage treatment, and relates to a building construction sewage treatment system which comprises a reaction tank, an aeration assembly, a flow divider and a base for bearing the flow divider and fixing the flow divider in the reaction tank. The aeration assembly comprises a lower aeration unit and an upper aeration unit. The flow divider includes an outer barrel, at least one inner barrel, and a central post. The outer cylinder, the inner cylinder and the center column are coaxially sleeved, and intervals are formed between the opposite circumferential faces. Inner tooth parts are formed on the inner circumferential faces of the outer cylinder and the inner cylinder, and outer tooth parts are formed on the outer circumferential faces of the inner cylinder and the central column. The inner tooth parts and the outer tooth parts protrude in the radial direction, and the inner tooth parts and the outer tooth parts on the opposite circumferential faces are oppositely arranged in an up-down staggered mode. And a gap is formed between the tip ends of the inner tooth part and the outer tooth part and the opposite circumferential surface. And the orifices of the aeration pipes of the aeration units correspond to the upper part and the lower part of the flow divider respectively. According to the invention, the mixing and mass transfer effects of aeration and a water body can be improved, and the degree of oxygenolysis of organic matters in sewage in a high dissolved oxygen state can be promoted.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a system for treating sewage generated during construction. Background Art

[0002] With the continuous development of urban construction, the problem of construction wastewater has become increasingly prominent. If the sewage generated during the construction process is not effectively treated, it will cause serious pollution and damage to the environment. Therefore, the treatment of construction sewage has become increasingly important. The characteristics of wastewater / sewage generated during construction are mainly as follows: (1) Large amount of water, including domestic sewage, sewage generated by construction car washing, sewage generated by coagulation mixing and masonry processes, etc. The amount of sewage generated is quite large; (2) High turbidity and high content of suspended solids. Soil, dust and other debris caused by the construction process will be carried into the wastewater, resulting in high turbidity and high content of suspended solids in the wastewater; (3) High COD and BOD indicators, and the wastewater contains a large amount of organic matter, heavy metals, bacteria and other harmful substances. If it is discharged directly into the environment without treatment, it will cause serious pollution to the environment and water sources and endanger human health. Organic matter can also cause eutrophication of water bodies, trigger algae outbreaks, and affect aquaculture.

[0003] In order to effectively manage and treat construction wastewater, the commonly used treatment methods currently include physical treatment, chemical treatment and biological treatment. Among them, physical treatment mainly removes solid particles, suspended matter and sediments in wastewater through technical means such as sedimentation, filtration and adsorption to achieve the purpose of preliminary water purification, which belongs to the primary link / primary treatment of wastewater treatment; chemical treatment is to treat wastewater with drugs, mainly by adjusting the pH value of wastewater, dissolving or precipitating harmful substances contained in wastewater, and removing harmful substances such as heavy metal ions in wastewater. It belongs to the intermediate link / intermediate treatment of wastewater treatment. If the wastewater has no recycling requirements but is discharged, it can be discharged after simple aeration, activated carbon adsorption, membrane filtration and other treatment processes after chemical treatment; if the recycling requirements are met, biological treatment / advanced treatment is required, that is, the wastewater is treated by using the ability of microorganisms to degrade organic matter, mainly including activated sludge method, fixed biofilm method, etc. After biological treatment, COD and BOD in wastewater can be removed well. Common advanced treatment methods include deep aeration tanks, biological contact oxidation tanks and ultraviolet disinfection, which can more thoroughly remove organic matter, bacteria and viruses in construction wastewater and ensure the quality of effluent.

[0004] This patented technology is applied in the advanced treatment of construction wastewater, aiming to solve the problems of insufficient aeration, poor mixing and mass transfer of oxygen and microorganisms, and low oxygen solubility in water that cannot better meet the needs of microorganisms for sufficient oxidation and decomposition of organic matter enriched on the surface of biological carriers. Summary of the invention

[0005] To achieve the above-mentioned purpose, the present invention provides a construction wastewater treatment system, which can improve the mixing and mass transfer effects between aeration and water bodies by implementing diversion treatment on the wastewater, and help the organic matter in the wastewater to interact with microorganisms in a fluidized state under sufficient aeration conditions, and can provide sufficient oxygen for the microbial community adsorbed on the surface of the microbial carrier, thereby achieving the purpose of oxidative decomposition of organic matter in the wastewater under a high dissolved oxygen state.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a construction wastewater treatment system, comprising:

[0007] The reaction tank is provided with a water inlet at the bottom of the tank cavity.

[0008] The aeration assembly includes a lower aeration unit and an upper aeration unit.

[0009] The flow divider includes an outer cylinder, at least one inner cylinder, and a center column. The outer cylinder, the inner cylinder and the center column are coaxially assembled, and radial spacing is formed between the inner circumference of the outer cylinder and the outer circumference of the inner cylinder, and between the outer circumference of the center column and the inner circumference of the inner cylinder, so as to form an annular channel that penetrates in the axial direction. A plurality of inner teeth are formed on the inner circumference of the outer cylinder, which are distributed alternately in the axial direction, and a plurality of inner teeth are formed on the outer circumference of the inner cylinder, which are distributed alternately in the axial direction, and a plurality of inner teeth are formed on the inner circumference, which are respectively formed into a plurality of outer teeth and a plurality of inner teeth. A plurality of outer teeth are formed on the outer circumference of the center column, which are distributed alternately in the axial direction, and a plurality of outer teeth are formed. The inner teeth and the outer teeth both protrude radially outward, and the inner teeth and the outer teeth on the adjacent / opposite inner and outer circumferences are arranged in a relative state of being staggered up and down. A gap is formed between the protruding tip of the inner tooth portion and the adjacent outer peripheral surface, and a gap is formed between the protruding tip of the outer tooth portion and the adjacent inner peripheral surface.

[0010] And a base is fixed in the tank cavity of the reaction tank, and the lower ends of the outer tube, inner tube and central column on the diverter are in contact with the base, and can stand on the upper end surface of the base, and finally the diverter is suspended in the tank cavity of the reaction tank by the support of the base.

[0011] The aeration pipe openings of the lower aeration unit are arranged above the inner port of the water inlet.

[0012] The aeration pipe openings of the upper aeration unit are arranged above the upper port of the annular channel on the diverter.

[0013] In the above scheme, the microorganism carrier filler for carrying microorganisms can be placed in the entire tank cavity of the reaction tank, or can be mainly placed in the tank cavity located above and below the diverter.

[0014] Optionally, a downwardly extending annular flange is formed at the lower end of the outer cylinder. A plurality of support arms are formed at the lower end of the inner cylinder, the support arms extend downward and are alternately distributed around the circumference. A support arm is formed at the lower part of the central column and extends downward.

[0015] The lower end of the annular flange and the lower end of the supporting arm are in contact with the end faces of the partitions alternately distributed on the base, so that the outer cylinder, the inner cylinder and the central column can stand on the base respectively.

[0016] Optionally, the inner cylinder includes a first inner cylinder, a second inner cylinder and a third inner cylinder, so that the first inner cylinder is placed in the outer cylinder, the second inner cylinder is placed in the first inner cylinder, the third inner cylinder is placed in the second inner cylinder, and the center column is placed in the third inner cylinder.

[0017] A radial spacing is formed between the relative circumferential surfaces of the first inner cylinder and the outer cylinder, between the relative circumferential surfaces of the second inner cylinder and the first inner cylinder, between the relative circumferential surfaces of the third inner cylinder and the second inner cylinder, and between the relative circumferential surfaces of the center column and the third inner cylinder, thereby forming an outer ring channel and an inner ring channel that penetrate along the axial direction.

[0018] A plurality of external teeth are formed on the outer circumferences of the first inner cylinder, the second inner cylinder and the third inner cylinder, and a plurality of internal teeth are formed on the inner circumferences. The layers of internal teeth and the layers of external teeth on the multiple pairs of adjacent circumferences between the outer cylinder, each inner cylinder and the central column are arranged in a relative state of being staggered up and down.

[0019] Optionally, the upper end surface of the first inner cylinder and the upper end surface of the third inner cylinder are both retracted downward relative to the upper end surface of the outer cylinder, the upper end surface of the second inner cylinder, and the upper end surface of the center column.

[0020] Radial grooves are formed on the upper end surfaces of the outer cylinder, the second inner cylinder and the central column, so that the radial grooves are arranged along the same radial direction. A cross bar is inserted into the radial groove to connect the outer cylinder, the second inner cylinder and the central column into a whole.

[0021] Optionally, the inner tooth portion and / or the outer tooth portion is annular, formed as an annular radial flange.

[0022] Preferably, the cross section of the inner toothing and / or the cross section of the outer toothing is triangular in shape—seen in axial section.

[0023] The "radial flange" referred to here can be understood as a situation where the outward extension direction of the radial flange is consistent with the radial direction of the outer tube, inner tube or center column, or a situation where the radial flange extends upward or downward relative to the radial direction of the outer tube, inner tube or center column.

[0024] Optionally, both the inner tooth portion and the outer tooth portion are a plurality of radial flange teeth distributed alternately around the circumference.

[0025] On two opposite / adjacent circumferential surfaces, the radial flange teeth formed on the inner circumferential surface correspond to the upper or lower part of the circumferential gap between two adjacent radial flange teeth formed on the outer circumferential surface; in other words, on two opposite circumferential surfaces, the radial flange teeth formed on the outer circumferential surface correspond to the upper or lower part of the circumferential gap between two adjacent radial flange teeth formed on the inner circumferential surface.

[0026] Optionally, the radial flange teeth are arc-shaped elongated strips or pyramids extending in the circumferential direction.

[0027] Preferably, the cross section of the arc-shaped elongated body is triangular.

[0028] Optionally, a plurality of diverters are fixedly provided on the base and the diverters are alternately distributed in multiple layers up and down.

[0029] The aeration assembly also includes a plurality of intermediate aeration units, and each intermediate aeration unit is correspondingly arranged between two adjacent flow dividers. A microbial carrier filler carrying microorganisms is placed in at least the reaction tank cavity between two adjacent flow dividers.

[0030] Optionally, the aeration assembly further comprises an intermediate aeration unit. A plurality of arc-shaped cavities are formed on the inner wall of the outer cylinder and / or the outer wall of the central column. The aeration pipe opening of the intermediate aeration unit extends into the arc-shaped cavity.

[0031] The multiple arc-shaped cavities distributed on the inner wall of the outer cylinder or the outer wall of the central column can be divided into multiple groups, each group includes multiple arc-shaped cavities, and the number of arc-shaped cavities in each group can be the same or different. Each group of arc-shaped cavities is divided into multiple layers in the axial direction, and each arc-shaped cavity of two adjacent layers can be in a corresponding relationship of directly above and directly below, preferably in a staggered arrangement, that is, the top projections of the arc-shaped cavities of two adjacent layers can partially overlap.

[0032] When multiple layers of arc-shaped cavities are provided, an intermediate aeration unit is respectively configured corresponding to each layer of the arc-shaped cavities, so that the aeration pipe openings of the intermediate aeration unit extend into each arc-shaped cavity of each layer.

[0033] Optionally, a through hole is formed along the axis of the central column and an axial tube is inserted into the through hole. The upper end of the axial tube is connected to the inner end of the air inlet pipe, and the outer end of the air inlet pipe is connected to the aeration unit. The lower end of the axial tube extends to the lower part of the diverter and is below the lower port of the annular channel, and is connected to a plurality of radial branches, and the plurality of radial branches are alternately distributed around the circumference. The radial branches penetrate the entire radial extension area of ​​the annular channel and a plurality of aeration nozzles are distributed on the tube wall of the radial branches.

[0034] The beneficial effects of the present invention are as follows: the construction wastewater treatment system involved in the present invention can improve the mixing and mass transfer effects between aeration and water bodies by implementing diversion treatment on the wastewater, which helps to achieve the interaction between organic matter in the wastewater and microorganisms in a fluidized state under sufficient aeration conditions, and can provide sufficient oxygen for the microbial community adsorbed on the surface of the microbial carrier, thereby achieving the purpose of oxidative decomposition of organic matter in the wastewater under a high dissolved oxygen state, thereby further improving the COD and BOD indicators of water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the local cross-sectional structure of the first embodiment.

[0036] Figure 2 A schematic diagram of the structure of the base from a top view.

[0037] Figure 3 It is a schematic diagram of the cross-sectional structure of the outer cylinder in the first embodiment.

[0038] Figure 4 It is a schematic diagram of the top view of the outer cylinder in the first embodiment.

[0039] Figure 5 It is a schematic diagram of the cross-sectional structure of the first inner cylinder in the first embodiment.

[0040] Figure 6 This is a schematic diagram of the top view of the first inner cylinder in Example 1.

[0041] Figure 7 It is a schematic diagram of the cross-sectional structure of the second inner cylinder in the first embodiment.

[0042] Figure 8 This is a schematic diagram of the top view of the second inner cylinder in Example 1.

[0043] Fig. 9 It is a schematic diagram of the cross-sectional structure of the third inner cylinder in the first embodiment.

[0044] Fig.10 This is a schematic diagram of the top view of the third inner cylinder in Example 1.

[0045] Fig.11 It is a schematic diagram of the cross-sectional structure of the central column in the first embodiment.

[0046] Fig.12 This is a schematic diagram of the top view of the central column in Example 1.

[0047] Fig.13 This is a schematic diagram of the bottom-up structure of the central column in Example 1.

[0048] Fig.14 for Fig.11 Schematic diagram of the cross-sectional structure at AA in the middle.

[0049] Fig.15 The following is a schematic diagram showing the radial correspondence between the teeth on the outer cylinder and the teeth on each inner cylinder.

[0050] Fig.16 Schematic diagram of the cross-sectional structure of the lower diverter of the second embodiment.

[0051] Fig.17 for Fig.16 Schematic diagram of the cross-sectional structure at BB in the middle.

[0052] Fig.18 It is a schematic diagram of the top view of the lower outer cylinder of the second embodiment.

[0053] Fig.19 This is a schematic diagram of the top view of the first inner cylinder in the second embodiment.

[0054] Fig. 20 This is a schematic diagram of the top view of the second inner cylinder in the second embodiment.

[0055] Fig.21 This is a schematic diagram of the top view of the third inner cylinder in the second embodiment.

[0056] Fig. 22 This is a schematic diagram of the top view of the lower center column of Example 2.

[0057] Fig.23 This is a schematic diagram of the cross-sectional structure of the second inner cylinder in Example 3.

[0058] Fig.24 The figure is a schematic diagram of the matching relationship between the second inner cylinder and the first inner cylinder and the third inner cylinder in the third embodiment.

[0059] Fig.25 This is a schematic diagram of the arrangement structure of the diverter in the reaction tank in Example 4.

[0060] Fig.26 This is a schematic diagram of the top view of the microbial carrier filler used in this patent solution.

[0061] Fig. 27 This is a schematic diagram A of the second embodiment, showing that the teeth of each layer of inner teeth or outer teeth are alternately staggered in the axial direction.

[0062] Fig.28 This is a schematic diagram B of the second embodiment, showing that the teeth of each layer of inner teeth or outer teeth are alternately staggered in the axial direction.

[0063] In the figure: 100 reaction tank, 101 water inlet; 200 aeration assembly, 201 lower aeration unit, 202 middle aeration unit, 203 upper aeration unit; 300 flow divider, 301 outer ring channel, 302 inner ring channel; 400 base, 401 partition, 402 radial flange; 500 spoiler; 600 grid plate;

[0064] 10 outer cylinder, 11 annular flange, 12 first radial groove; 20 first inner cylinder, 21 first support arm; 30 second inner cylinder, 31 second support arm, 32 second radial groove; 40 third inner cylinder, 41 third support arm; 50 center column, 51 fourth support arm, 52 third radial groove, 53 through hole, 54 annular counterbore, 541 conducting hole; 60 cross bar; 70 air distribution pipe part, 71 first pipe part, 711 plug block, 712 first air inlet pipe, 713 cavity, 72 second pipe part, 721 axial pipe, 722 second air inlet pipe, 723 radial branch pipe; 80 microorganism carrier filler, 81 arc plate, 82 elastic connecting plate, 83 nest hole;

[0065] 1 inner tooth portion, 1a inner tooth portion A, 1b inner tooth portion B; 2 outer tooth portion, 2a outer tooth portion A, 2b outer tooth portion B; 3 arc-shaped cavity. DETAILED DESCRIPTION

[0066] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical contents. In addition, the longitudinal and axial directions referred to in this patent are directions extending along the Y-axis, and the positive extension direction of the Y-axis is upward, and the negative extension direction is downward. The lateral direction refers to the direction on the XZ plane or parallel to the XZ plane (the radial direction of the outer cylinder 10 is on the XZ plane or parallel to the XZ plane), and the positive extension direction along the Z-axis is inside, and the negative extension direction is outside.

[0067] like Figures 1 to 28A construction wastewater treatment system shown includes a reaction tank 100 , an aeration assembly 200 , and a diverter 300 and a base 400 disposed in the reaction tank 100 .

[0068] The construction wastewater treatment system involved may also include a circulating pump system arranged outside the reaction tank 100 for promoting the upward and downward circulation of the water in the reaction tank 100, a sewage pool connected to the water inlet 101 arranged at the lower part of the reaction tank 100 through a pipeline and a peristaltic pump and / or a booster pump arranged on the pipeline, a sedimentation tank connected to the drain outlet arranged at the upper part of the reaction tank 100, a water outlet, a microorganism dispenser and related pipelines, a microorganism carrier filler dispenser and related pipelines, a biofilm removal unit and related pipelines, etc. arranged on the reaction tank 100, as well as auxiliary facilities such as power distribution facilities and control facilities. Although they are not shown in the diagram, it does not mean that they are not available or are not needed. Those skilled in the art can adaptively choose to use this part based on the existing technology and in combination with the design features of this patent, so they are not described in detail.

[0069] In the present patent solution, the aeration assembly 200 includes a lower aeration unit 201, a middle aeration unit 202 and an upper aeration unit 203. The diverter 300 includes an outer cylinder 10, a first inner cylinder 20, a second inner cylinder 30 and a third inner cylinder 40 (at least one inner cylinder is required), and a central column 50.

[0070] The outer cylinder 10, each inner cylinder and the center column 50 are coaxially assembled and arranged so that radial spacing is formed between the inner circumference of the outer cylinder 10 and the outer circumference of the first inner cylinder 20, between the inner and outer circumferences of each inner cylinder, and between the outer circumference of the center column 50 and the inner circumference of the third inner cylinder 40, thereby forming an annular channel (including the outer ring channel 301 and the inner ring channel 302 shown in the figure) that penetrates in the axial direction. In detail, as Figure 1 , Fig.16 As shown, the first inner cylinder 20 is placed in the outer cylinder 10, the second inner cylinder 30 is placed in the first inner cylinder 20, the third inner cylinder 40 is placed in the second inner cylinder 30, and the center column 50 is placed in the third inner cylinder 40. A radial spacing is formed between the relative circumferences of the first inner cylinder 20 and the outer cylinder 10, between the relative circumferences of the second inner cylinder 30 and the first inner cylinder 20, between the relative circumferences of the third inner cylinder 40 and the second inner cylinder 30, and between the relative circumferences of the center column 50 and the third inner cylinder 40, so as to form two annular channels, an outer ring channel 301 and an inner ring channel 302, which penetrate along the axial direction.

[0071] A plurality of inner teeth 1 are formed on the inner circumferential surface of the outer cylinder 10 and are distributed alternately in the axial direction. A plurality of outer teeth 2 are formed on the outer circumferential surface of the center column 50 and are distributed alternately in the axial direction. A plurality of outer teeth 2 are formed on the outer circumferential surface of each inner cylinder and a plurality of inner teeth 1 are formed on the inner circumferential surface. The inner teeth 1 and the outer teeth 2 both protrude radially outward and the layers of inner teeth 1 and outer teeth 2 on the adjacent / opposite inner and outer circumferential surfaces are arranged in an up-and-down staggered relative state. A (radial) spacing is formed between the protruding tip of the inner teeth 1 and the adjacent outer circumferential surface (wall surface), and a (radial) spacing is formed between the protruding tip of the outer teeth 2 and the adjacent inner circumferential surface (wall surface). In detail, as Figure 1 , Figures 3 to 11 , Figures 16 to 24 As shown, multiple external teeth 2 are formed on the outer circumferences of the first inner cylinder 20, the second inner cylinder 30 and the third inner cylinder 40, and multiple internal teeth 1 are formed on the inner circumferences. The layers of internal teeth 1 and the layers of external teeth 2 on the multiple pairs of adjacent / opposite circumferences between the outer cylinder 10, each inner cylinder and the center column 50 are arranged in a relative state of being staggered up and down.

[0072] The base 400 is fixed in the tank cavity of the reaction tank 100, and the lower ends of the outer cylinder 10, each inner cylinder and the central column 50 on the diverter 300 are in contact with the upper end surface of the base 400, so that the diverter 300 can stand on the upper end surface of the base 400 and be suspended in the tank cavity.

[0073] The aeration pipe openings of the lower aeration unit 201 are arranged above the inner port of the water inlet 101. The aeration pipe openings of the upper aeration unit 203 are arranged above the upper port of the annular channel of the diverter 300.

[0074] In the above scheme, the microorganism carrier filler 80 for carrying microorganisms can be placed in the entire tank cavity of the reaction tank 100, or can be mainly placed in the tank cavity area of ​​the reaction tank 100 located above and below the diverter 300.

[0075] The oxygen-containing bubbles ejected from the lower aeration unit 201 need to pass through the diverter 300 and flow upward through the annular channel formed between the relative circumferences of the outer cylinder 10, the inner cylinder and the central column 50 of the diverter 300 as the sewage / wastewater (after the preliminary treatment) flows upward from the lower part of the reaction tank 100. In the process of flowing upward through the annular channel (the outer ring channel 301 and the inner ring channel 302 shown in the figure), they will be subjected to the alternating flow blocking and cutting effects of the inner tooth portion 1 and the outer tooth portion 2, which not only causes the flow direction of the liquid to change and weakens the axial flow velocity, but also cuts the bubbles mixed in the liquid to continuously generate smaller bubbles and microbubbles, thereby improving the mixed mass transfer effect of oxygen and sewage. Therefore, the present patent scheme improves the mass transfer and mixing effects of aeration and water bodies, so that the difficult-to-degrade organic matter in the water body can be fully transferred and mixed with the microbial carrier in a fluidized state under sufficient aeration conditions, thereby providing more sufficient dissolved oxygen for a large number of microorganisms adsorbed on the microbial carrier filler 80, thereby achieving the purpose of oxidative decomposition of (small molecule) organic matter by microorganisms under high dissolved oxygen conditions.

[0076] Embodiment 1: Figures 1 to 15 As shown, the inner tooth portion 1 and the outer tooth portion 2 are annular and are annular radial flanges. Figures 3 to 14 In the figure, the inner tooth portion A1a and the outer tooth portion A2a are shown. As shown in the figure, the cross section of the inner tooth portion A1a and the cross section of the outer tooth portion A2a are both triangular.

[0077] The "radial flange" referred to here can be understood as a situation where the outward protruding extension direction of the radial flange is consistent with the radial direction of the outer tube 10, inner tube or center column 50 (see figure); it can also be understood as a situation where the radial flange extends upward or downward relative to the radial direction of the outer tube 10, inner tube or center column 50.

[0078] like Fig.15As shown, the maximum outer diameter / tip outer diameter D1 of the inner tooth portion A1a on the outer cylinder 10 is greater than the maximum outer diameter / tip outer diameter D2 of the outer tooth portion A2a on the first inner cylinder 20 located above or below it. Therefore, after the outer cylinder 10 and the first inner cylinder 20 are coaxially mounted together, there will be partial obstruction and overlap (top view projection) between the inner tooth portions A1a and the outer tooth portions A2a on the two circumferential surfaces that are opposite to each other in the lateral / radial direction, which can cause the flow direction and speed of the water body to change, and the tip and edge of the tooth will also shear the water body, and cut the bubbles dissolved in the water body into smaller bubbles and microbubbles, which helps to promote the mixed mass transfer effect of the water body and dissolved oxygen. Similarly, the tip inner diameter d1 of the inner tooth portion A1a on the first inner cylinder 20 is larger than the maximum outer diameter / tip outer diameter D3 of the outer tooth portion A2a located above or below it on the second inner cylinder 30, so after the first inner cylinder 20 and the second inner cylinder 30 are coaxially mounted together, there will be partial obstruction and overlap between the inner tooth portion A1a and the outer tooth portion A2a on the two circumferential surfaces in the lateral / radial direction (top view projection); the tip inner diameter d2 of the inner tooth portion A1a on the second inner cylinder 30 is larger than the maximum outer diameter / tip outer diameter D4 of the outer tooth portion A2a located above or below it on the third inner cylinder 40, so After the second inner cylinder 30 and the third inner cylinder 40 are coaxially mounted together, there will be partial blocking and overlap between the inner teeth A1a and the outer teeth A2a on the two circumferential surfaces in the horizontal / radial direction (top view projection); the tip inner diameter d3 of the inner teeth A1a on the third inner cylinder 40 is greater than the maximum outer diameter / tip outer diameter D5 of the outer teeth A2a above or below it on the central column 50, so after the third inner cylinder 40 and the central column 50 are coaxially mounted together, there will be partial blocking and overlap between the inner teeth A1a and the outer teeth A2a on the two circumferential surfaces in the horizontal / radial direction (top view projection). The upper and lower blocking and overlapping arrangement formed between the teeth (inner teeth A1a and outer teeth A2a) on the inner / outer circumferential surfaces can cause the flow direction and speed of the water body to change, and the tips and edges of the teeth will also shear the water body, and the bubbles dissolved in the water body will be cut into smaller bubbles and microbubbles, which will help promote the mixed mass transfer effect of the water body and dissolved oxygen.

[0079] A spoiler 500 is provided in the tank cavity of the reaction tank 100 and correspondingly above the water inlet 101. The port of the spoiler 500 faces downward so that the upper end of the water inlet 101 is inserted into the spoiler 500. The lower port of the spoiler 500 is in a conical expansion style, which can promote the lateral dispersion flow of the water body and enhance the mixing effect of the oxygen-containing gas sprayed from the lower aeration unit 201 and the water body.

[0080] The base 400 is annular, and a radial flange 402 is formed at the lower part of the inner wall, and the two ends of the partition 401 are connected to the radial flange 402. The lower ends of the outer cylinder 10, the inner cylinder and the central column 50 are in contact with the upper end surface of the partition 401. The lower end of the outer cylinder 10 is inserted into the axial flange formed at the upper end of the base 400, and the two are fixedly connected as a whole by bolts. The inner hole of the base 400 corresponds to the outer ring channel 301 and the inner ring channel 302. It is preferred that the inner diameter of the base 400 is larger than the outer inner diameter / maximum inner diameter of the outer ring channel 301.

[0081] The upper end surface of the first inner cylinder 20 and the upper end surface of the third inner cylinder 40 are retracted downward relative to the upper end surface of the outer cylinder 10, the upper end surface of the second inner cylinder 30, and the upper end surface of the center column 50 (the lowermost upper end surface). The upper end surface of the outer cylinder 10, the upper end surface of the second inner cylinder 30, and the upper end surface of the center column 50 can be flush or have a height difference. Radial grooves are formed on the upper end surfaces of the outer cylinder 10, the second inner cylinder 30, and the center column 50, respectively, the first radial groove 12, the second radial groove 32, and the third radial groove 52, so that each radial groove is arranged along the same radial direction. A cross bar 60 is inserted into the first radial groove 12, the second radial groove 32, and the third radial groove 52 at the same time, so as to connect the outer cylinder 10, the second inner cylinder 30, and the center column 50 (upper part) into a whole. Therefore, the first inner barrel 20 and the third inner barrel 40 have certain swimming capabilities in the axial and radial directions, which helps to promote the disturbance effect on the water body, making the flow direction and flow speed of the water body change irregularly and rapidly, thereby improving the mixed mass transfer effect of the water body and dissolved oxygen / bubbles.

[0082] A downwardly extending annular flange 11 is formed at the lower end of the outer cylinder 10. A plurality of support arms are formed at the lower end of each inner cylinder, namely, a first support arm 21 formed at the lower portion of the first inner cylinder 20, a second support arm 31 formed at the lower portion of the second inner cylinder 30, and a third support arm 41 formed at the lower portion of the third inner cylinder 40, and each of the aforementioned support arms extends downward and is alternately distributed around the circumference. At the same time, a fourth support arm 51 is formed at the lower portion of the central column 50 and extends downward.

[0083] The lower end of the annular flange 11 and the lower end of each support arm are in contact with the upper end surface of the partition 401 distributed alternately on the base 400, so that the outer cylinder 10, the inner cylinder and the central column 50 can stand on the base 400 respectively, and an axial distance / space is formed between the lower end surface of the diverter 300 (or the outer cylinder 10, the inner cylinder, the central column 50) and the upper end surface of the base 400 to promote the radial / lateral fluidity of the water body near the lower end of the diverter 300 to ensure the unit flow rate when the water body flows upward. The improved structure here is combined with the above-mentioned feature that the first inner cylinder 20 and the third inner barrel 40 have a certain swimming ability in the axial direction and radial direction, which can improve the overall upward flow ability and unit flow rate of the water body, and extend the path of water body disturbance, that is, the water body has begun to be disturbed near the lower part of the diverter 300.

[0084] A plurality of arc-shaped cavities 3 are formed on the inner wall of the outer cylinder 10 and the outer wall of the central column 50 . The aeration pipe openings of the intermediate aeration unit 202 extend into each arc-shaped cavity 3 .

[0085] The multiple arc-shaped cavities 3 distributed on the inner wall of the outer cylinder 10 and the outer wall of the central column 50 are divided into multiple groups, each group includes multiple arc-shaped cavities 3 and the number of arc-shaped cavities 3 in each group is the same (the number may be different during implementation). Each group of arc-shaped cavities 3 is divided into multiple layers in the axial direction, and the arc-shaped cavities of two adjacent layers are in a corresponding relationship of being directly above and directly below. During implementation, the arc-shaped cavities 3 of two adjacent layers can also be arranged in an up-and-down staggered manner, that is, the top projections of the arc-shaped cavities 3 of two adjacent layers can partially overlap. When multiple layers of arc-shaped cavities 3 are provided, an intermediate aeration unit 202 is respectively configured for each layer of arc-shaped cavities 3, so that the aeration pipe openings of the intermediate aeration unit 202 extend into the arc-shaped cavities 3 of each layer.

[0086] Embodiment 2: The main difference between this embodiment and embodiment 1 is mainly reflected in the specific forms of the inner tooth portion 1 and the outer tooth portion 2. Other structural features are basically the same and will not be repeated.

[0087] The inner tooth portion 1 and the outer tooth portion 2 are both multiple radial flange teeth distributed alternately around the circumference. Figures 16 to 22 In the figure, they are represented as inner tooth portion B1b and outer tooth portion B2b respectively. On the two opposite (inner and outer) circumferential surfaces, the radial flange teeth formed on the inner circumferential surface correspond to the upper or lower part of the circumferential gap between two adjacent radial flange teeth formed on the outer circumferential surface, as shown in FIG. Fig.16 , Fig.17. In other words, the radial flange teeth formed on the outer circumferential surfaces of the two opposite circumferential surfaces correspond to the upper or lower part of the circumferential gap between the two adjacent radial flange teeth formed on the inner circumferential surface. It should be noted that the radial flange teeth on the inner circumferential surface (hereinafter referred to as tooth a) correspond to the upper or lower part of the circumferential gap between the adjacent radial flange teeth (hereinafter referred to as tooth b) on the outer circumferential surface that matches / opposes it, including the situation where both ends of tooth a are completely in the gap between the two teeth b (such as Fig.17 The present invention also provides a case where at least one end of tooth a extends to directly above or below a tooth b.

[0088] like Fig. 27 , Fig.28 As shown, the radial flange teeth are arc-shaped elongated bodies or triangular pyramids extending in the circumferential direction. The cross section of the arc-shaped elongated bodies is triangular.

[0089] Fig. 27 , Fig.28 1 is a state diagram after the inner circumference or outer circumference (along the OO side line) of the outer cylinder 10, the inner cylinder or the center column 50 is unfolded. It can be seen from the figure that the radial flange teeth constituting the inner tooth portion 1 or the outer tooth portion 2 in each layer are arranged in an alternating manner up and down, that is, there is a certain height difference between two adjacent radial flange teeth, and the size of the height difference can be as follows Fig. 27 , Fig.28 As shown, there is a cross section between the upper and lower parts of two adjacent radial flange teeth; there can also be no cross overlap between the upper and lower parts of two adjacent radial flange teeth. The aforementioned cross-arranged radial flange teeth can, on the one hand, enhance the ability of the water body to flow upward in the vertical direction in the tank cavity and reduce resistance, and on the other hand, can enhance the shearing degree of the water body and bubbles, form more microbubbles, enhance the stirring effect on the water body, and further promote the dissolved oxygen rate in the water body, that is, the mixing uniformity of the microbubbles and the water body, and can better provide sufficient and sufficient dissolved oxygen for a large number of microorganisms adsorbed on the microbial carrier seasoning 80, so as to achieve the purpose of oxidizing and decomposing organic matter in the water body by microorganisms under high dissolved oxygen conditions.

[0090] The above two embodiments are also equipped with an air distribution pipe part 70, which includes a first pipe part 71 and a second pipe part 72. The first pipe part 71 corresponds to and matches the arc-shaped cavity 3 formed on the central column 50, and can aerate each arc-shaped cavity 3 provided on the outer circumference of the central column 50. The second pipe part 72 corresponds to and matches the four radial branch pipes 723 extending downward into the annular flange 11.

[0091] The first pipe portion 71 includes a plug block 711 and a first air inlet pipe 712. A cavity 713 is formed on the body of the plug block 711, and a ring-shaped port is formed at the lower end of the cavity 713. One end of the first air inlet pipe 712 penetrates into the cavity 713 through the cavity of the cross bar 60, so that a certain intermediate aeration unit 202 of the aeration assembly 200 is connected to the cavity 713 through the first air inlet pipe 712.

[0092] An annular countersunk hole 54 extending axially downward is formed on the center column 50, so that the lower end of the annular countersunk hole 54 extends to a position at a height equivalent to the arc groove 3 provided on the outer peripheral surface of the center column 50, and a through hole 541 is provided at the lower part of the wall of the annular countersunk hole 54 to connect the annular countersunk hole 54 with the arc groove 3 (see FIG. Fig.14 When the plug block 711 is fixed on the cross bar 60 and the cross bar 60 is fixed on the upper part of the center column 50, the lower annular port of the cavity 713 can be plugged with the upper annular port of the annular counterbore 54 to establish a communication relationship.

[0093] The second pipe part 72 includes an axial pipe 721 and a second air inlet pipe 722. The second air inlet pipe 722 is inserted into the cavity formed on the crossbar 60 so that its inner end can correspond to the upper part of the central column 50. A through hole 53 is formed along the axis of the central column 50 and the axial pipe 721 is inserted into the through hole 53 so that the upper end of the axial pipe 721 is connected to the inner end of the second air inlet pipe 722, and the outer end of the second air inlet pipe 722 is connected to an aeration unit. The lower end of the axial pipe 721 extends to the lower part of the diverter 300 and is below the lower port of the annular channel, and is connected to four radial branch pipes 723, and the four radial branch pipes 723 are alternately distributed around the circumference. The radial branch pipes 723 penetrate the entire radial extension area of ​​the annular channel and a plurality of aeration spray holes are distributed on the pipe wall of the radial branch pipes 723. The radial branch pipes 723 extend in the transverse direction from the spacing between the support arms set on the inner tube and the central column.

[0094] The above-mentioned middle aeration unit 202 is set up, the former can further supplement oxygen-containing gas and increase the dissolved oxygen content in the water body; the latter can also rely on the floating lift of the bubbles exposed by the middle aeration unit 202 to promote the water body to flow upward, so as to reduce the energy consumption of promoting the water body to flow upward. The main purpose of setting the upper aeration unit 203 is the latter. Because the bubbles exploded by the middle aeration unit 202 are dispersed in the arc cavity 3 formed inside the diverter 300 (at least in the middle and lower height positions of the diverter 300), the bubbles can quickly diffuse into the annular channel (outer ring channel 301 or inner ring channel) in the horizontal direction, and are quickly mixed in the water body with the flow of the water body, and are sheared and divided by the inner tooth part 1 and the outer tooth part 2 to produce more small bubbles and micro bubbles, which can further increase the dissolved oxygen content of the water body and further improve the mixing mass transfer effect between aeration and the water body.

[0095] After the aeration assembly 200 is divided into a lower aeration unit 201, a plurality of middle aeration units 202 and an upper aeration unit 203, the utilization rate of aeration can be improved. That is, the aeration assembly 200 can control the aeration amount distributed to the upper, middle and lower height positions to improve the utilization degree and efficiency of aeration and reduce waste.

[0096] Embodiment 3: Fig.23 , Fig.24 As shown, compared with the solutions of the above two embodiments, the overall shape of the second inner cylinder 30 is mainly changed, so that the outer circumferential surface and the inner circumferential surface of the second inner cylinder 30 are changed from cylindrical surfaces to conical surfaces.

[0097] During the implementation of this patent, at least the outer circumference or inner circumference of the second inner cylinder 30 is formed into a conical surface. Specifically, the outer circumference of the second inner cylinder 30 is a conical surface with the large diameter end of the conical surface facing upward; the inner circumference of the second inner cylinder 30 is a conical surface with the large diameter end of the conical surface facing downward. (In a static state) After the second inner cylinder 30 is installed in the first inner cylinder 20, the radial distance between the relative circumferences of the two gradually decreases from bottom to top, Greater than After the third inner cylinder 40 is installed in the second inner cylinder 30, the radial distance between the relative circumferences of the two cylinders gradually decreases from bottom to top. Greater than

[0098] The scheme of the above embodiment can further enhance the disturbance effect on the water body, make the water body flow more turbulently upward, and can better shear the dissolved oxygen bubbles into microbubbles and fully mix with the water body. In addition, the structure of this embodiment is combined with the above-mentioned feature that the first inner cylinder 20 and the third inner cylinder 40 have a certain swimming ability in the axial direction and radial direction, which can enhance the radial / lateral swimming ability of the first inner cylinder 20 and the third inner cylinder 40 and generate a certain amplitude of swing at the upper and lower ends, which can not only enhance the overall upward flow capacity and unit flow of the water body, extend the path of disturbance to the water body, but also further enhance the disturbance capacity, thereby helping to improve the mixed mass transfer effect of the water body and aeration, increase the dissolved oxygen content in the water body, and better provide sufficient and sufficient oxygen for microorganisms.

[0099] Embodiment 4: Fig.25 As shown, a plurality of flow dividers 300 are fixedly mounted on the base 400 and the flow dividers 300 are arranged alternately in three layers. The plurality of intermediate aeration units 202 of the aeration assembly 200 are correspondingly arranged between two adjacent flow dividers 300. A microbial carrier filler 80 (not shown) carrying microorganisms is placed in the tank cavity of at least the reaction tank 100 between two adjacent flow dividers 300.

[0100] For each layer of the flow divider 300, the number of inner teeth 1 and outer teeth 2 distributed on the circumference of the outer cylinder 10, the inner cylinder, and the center column 50 is preferably controlled to be more than 3 layers, preferably 5 to 8 layers. The axial spacing between two adjacent layers is preferably controlled to be between 1 and 5 times the thickness of the inner teeth 1 or the thickness of the outer teeth 2, and the maximum is not more than 10 times. The setting requirements for the axial spacing between the inner teeth 1 and the outer teeth 2 of two adjacent layers are also applicable to the solutions of Examples 1 to 3.

[0101] Compared with the previous embodiment, the above embodiment reduces the axial height of the diverter 300 and increases the number. On the one hand, it can significantly reduce the resistance of the water body to upward flow and reduce energy consumption; on the other hand, it can ensure the improvement of the mixing and mass transfer effect between the water body and aeration (relative to the prior art), so that the organic matter that is difficult to degrade in the water body can be fully transferred and mixed with the microbial carrier in a fluidized state under sufficient aeration conditions, and sufficient dissolved oxygen can be provided for a large number of microorganisms attached to the carrier filler, so that the microorganisms can achieve oxidation and decomposition of organic matter in the water body under high dissolved oxygen conditions.

[0102] like Fig.26As shown, it is a schematic diagram of a microbial carrier filler 80 structure that can be better applied to the above-mentioned embodiments. The microbial carrier filler 80 includes a three-layer annular frame group surrounding the periphery of the central ring, and each layer of the arc frame group includes four arc frames and the four arc frames are alternately distributed around the circumference. The central ring and the arc frames are formed with a nest hole 83 structure, and a large number of microorganisms are attached to the surface of the nest hole 83.

[0103] The arc frame includes an arc plate 81 and elastic connecting plates 82 arranged at both ends of the arc plate 81. The elastic connecting plates 82 are wavy and can produce elastic deformation along the radial direction of the center ring (of the microorganism carrier filler 80) and elastic deformation along the circumferential direction. The elastic connecting plates 82 at both ends of the arc frame on the outer layer are respectively connected to the middle of the arc plates of the two adjacent arc frames on the inner side thereof or to the outer peripheral surface of the center ring.

[0104] The arc frames of each layer are staggeredly connected by a wavy elastic connecting plate 82 to form an integral microbial carrier filler 80, which can give the microbial carrier filler 80 a better ability to withstand impact. On the one hand, it can better ensure that the microorganisms attached to the microbial carrier filler 80 will not easily fall off the carrier due to impact; on the other hand, it can improve the condition of the microbial carrier filler 80 being broken due to impact, and can provide reliable and stable carrier conditions for the survival and attachment of microorganisms.

[0105] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. The present invention can be improved in many aspects without violating the overall concept, and those familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A construction wastewater treatment system, characterized by: It comprises a reaction tank (100), an aeration assembly (200), a flow divider (300) and a base (400); A water inlet (101) is provided at the bottom of the tank cavity of the reaction tank (100); The aeration assembly (200) comprises a lower aeration unit (201) and an upper aeration unit (203); The flow divider (300) comprises an outer cylinder (10), at least one inner cylinder, and a center column (50); the outer cylinder (10), the inner cylinder, and the center column (50) are coaxially assembled, and radial spacing is formed between the inner circumference of the outer cylinder (10) and the outer circumference of the inner cylinder, and between the outer circumference of the center column (50) and the inner circumference of the inner cylinder, so as to form an annular channel that penetrates in the axial direction; a plurality of inner teeth (1) are formed on the inner circumference of the outer cylinder (10) and are distributed alternately in the axial direction; a plurality of inner teeth (1) are formed on the outer circumference of the inner cylinder and are distributed alternately in the axial direction. A plurality of external teeth (2), a plurality of internal teeth (1) distributed alternately in the axial direction are formed on the inner circumference; a plurality of external teeth (2) distributed alternately in the axial direction are formed on the outer circumference of the center column (50); the internal teeth (1) and the external teeth (2) both protrude in the radial direction, and each layer of internal teeth (1) and each layer of external teeth (2) on the adjacent inner circumference and outer circumference are arranged in an up-and-down staggered manner; a spacing is formed between the protruding tip of the internal teeth (1) and the adjacent outer circumference, and a spacing is formed between the protruding tip of the external teeth (2) and the adjacent inner circumference; The base (400) is fixed in the tank cavity of the reaction tank (100) and the lower ends of the outer cylinder (10), the inner cylinder and the central column (50) on the flow splitter (300) are in contact with the base (400), so that the flow splitter (300) is suspended in the tank cavity; The aeration pipe openings of the lower aeration unit (201) are arranged above the inner port of the water inlet (101); The aeration pipe openings of the upper aeration unit (203) are distributed above the upper port of the annular channel on the diverter (300).

2. The construction wastewater treatment system according to claim 1 is characterized in that: A downwardly extending annular flange (11) is formed at the lower end of the outer cylinder (10); a plurality of support arms are formed at the lower end of the inner cylinder, the support arms extend downward and are alternately distributed around the circumference; a support arm is formed at the lower part of the central column (50), and the support arm extends downward; the lower end of the annular flange (11) and the lower end of the support arm are in contact with partitions (401) alternately distributed on the base (400), so that the outer cylinder (10), the inner cylinder and the central column (50) can stand on the base (400) respectively.

3. The construction wastewater treatment system according to claim 1, characterized in that: The inner cylinder comprises a first inner cylinder (20), a second inner cylinder (30) and a third inner cylinder (40), wherein the first inner cylinder (20) is placed in the outer cylinder (10), the second inner cylinder (30) is placed in the first inner cylinder (20), the third inner cylinder (40) is placed in the second inner cylinder (30), and the center column (50) is placed in the third inner cylinder (40); radial spacing is formed between the relative circumferential surfaces of the first inner cylinder (20) and the outer cylinder (10), between the relative circumferential surfaces of the second inner cylinder (30) and the first inner cylinder (20), between the relative circumferential surfaces of the third inner cylinder (40) and the second inner cylinder (30), and between the relative circumferential surfaces of the center column (50) and the third inner cylinder (40), thereby forming an outer ring channel (301) and an inner ring channel (302) that penetrate in the axial direction; A plurality of external teeth (2) distributed alternately in the axial direction are formed on the outer circumferential surfaces of the first inner cylinder (20), the second inner cylinder (30) and the third inner cylinder (40), respectively, and a plurality of internal teeth (1) distributed alternately in the axial direction are formed on the inner circumferential surfaces; the layers of internal teeth (1) and the layers of external teeth (2) on the multiple pairs of adjacent circumferential surfaces between the outer cylinder (10), each inner cylinder and the center column (50) are arranged in a relative state of being staggered up and down.

4. The construction wastewater treatment system according to claim 3 is characterized by: The upper end surfaces of the first inner cylinder (20) and the third inner cylinder (40) are retracted downward relative to the upper end surfaces of the outer cylinder (10), the second inner cylinder (30) and the center column (50); radial grooves are formed on the upper end surfaces of the outer cylinder (10), the second inner cylinder (30) and the center column (50), so that the radial grooves are arranged along the same radial direction; a cross bar (60) is inserted into the radial groove to connect the outer cylinder (10), the second inner cylinder (30) and the center column (50) into a whole.

5. The construction wastewater treatment system according to claim 1, characterized in that: The inner tooth portion (1) and / or the outer tooth portion (2) are both annular and are formed as an annular radial flange.

6. The construction wastewater treatment system according to claim 1, characterized in that: The inner tooth portion (1) and the outer tooth portion (2) are both a plurality of radial flange teeth alternately distributed around the circumference; The radial flange teeth formed on the inner circumferential surface of the two opposite circumferential surfaces are correspondingly arranged above or below the circumferential gap between two adjacent radial flange teeth formed on the outer circumferential surface.

7. The construction wastewater treatment system according to claim 6, characterized in that: The radial flange teeth are arc-shaped elongated strips or pyramids extending in the circumferential direction.

8. The construction wastewater treatment system according to any one of claims 1 to 7, characterized in that: The aeration assembly (200) further comprises an intermediate aeration unit (202); a plurality of arc-shaped cavities (3) are formed on the inner wall of the outer cylinder (10) and / or the outer wall of the central column (50); and an aeration pipe opening of the intermediate aeration unit (202) extends into each arc-shaped cavity (3).

9. The construction wastewater treatment system according to any one of claims 1 to 7, characterized in that: A through hole (53) is formed along the axis of the central column (50), and an axial tube (721) is inserted into the through hole; the upper end of the axial tube (721) is connected to the inner end of the air intake pipe, and the outer end of the air intake pipe is connected to the aeration assembly (200); the lower end of the axial tube (721) extends to the lower part of the flow divider (300) and is located below the lower port of the annular channel, and is connected to a plurality of radial branch pipes (723), and the plurality of radial branch pipes (723) are alternately distributed around the circumference; the radial branch pipes (723) penetrate the entire radial extension area of ​​the annular channel, and a plurality of aeration spray holes are distributed on the pipe wall of the radial branch pipes (723).

10. The construction wastewater treatment system according to any one of claims 1 to 7, characterized in that: A plurality of flow dividers (300) are fixedly arranged on the base (400), and the flow dividers (300) are arranged alternately up and down to form multiple layers; The aeration assembly (200) further comprises a plurality of intermediate aeration units (202), and each intermediate aeration unit (202) is correspondingly arranged between two adjacent flow dividers (300); A microorganism carrier filler (80) carrying microorganisms is placed in the tank cavity of at least the reaction tank (100) between two adjacent flow dividers (300).

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