Application of multi-stage forced-cutting rotary-mixing aerator in sewage treatment

Abstract

The invention provides application of a multi-stage forced-cutting rotary-mixing aerator in sewage treatment, and relates to the field of sewage treatment.The aerator comprises an aerator body, the aerator body comprises a straight guide cylinder, a rotational flow assembly and an air inlet pipe, the rotational flow assembly and the air inlet pipe are fixed in the guide cylinder, and the guide cylinder is of a structure with two open ends; the rotational flow assembly comprises three spiral blades which are sequentially arranged in the axial direction of the guide cylinder, and every two adjacent spiral blades are connected end to end and are rotationally arranged in a staggered mode; the air inlet pipe is fixed to the lower side of the rotational flow assembly, communicated to the outside of the guide cylinder and provided with an air inlet, and located on the lower side of the rotational flow assembly, and an air outlet is formed in the pipe wall of the air inlet pipe; at least two aerator bodies are arranged at intervals along the x direction and are connected through an air inlet pipe to form an aeration unit which is linearly arranged along the x direction, the aeration unit is arranged in a sewage treatment tank during working, and the aeration radiation area of the aeration unit is radiated along the y direction by taking the aeration unit as a base line; the device has the advantages of avoiding sediment deposition at the bottom of the pool, helping defoaming and having a large service area of a single aerator.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, specifically relates to the application of multistage strong cut rotary mixing aerator in sewage treatment. BACKGROUND

[0002] The tubular aerator is a common aeration equipment in the aeration tank, which passes air into the aerator to provide oxygen for the activated sludge in the aeration tank, so that the aerobic microorganisms degrade the organic matter in the sewage in the presence of oxygen.

[0003] In the early days, the commonly used tubular aerator in industry is the double helix blast aerator disclosed in the patent document with the announcement number CN2192619Y, but it has the defect of small aeration amount, so this kind of aerator is gradually replaced by the currently widely used tubular microporous aerator, but the gas distribution hole diameter of the traditional microporous aerator is microns, which has the problem of easy clogging of the microporous hole, thereby affecting the aeration effect and the maintenance frequency is high.

[0004] However, whether it is the double helix blast aerator or the currently more commonly used tubular microporous aerator, the installation method is to uniformly and spacedly arrange multiple aerators on the bottom of the aeration tank according to the bottom area, so as to ensure a certain aeration effect. The installation method of this kind of structure aerator has the problems of large consumption of aerators, high energy consumption, and on the other hand, it is not convenient to lay and construct in some special application environments, for example, an old aeration tank located underground, the surface of which is covered with concrete to form a ground structure, only a long rectangular maintenance opening is left at the side of the aeration tank. In this case, if you want to replace the aerators on the bottom of the tank, you have to dig up the road to expose the aeration tank and then lay and install the aerators, which is time-consuming and laborious, seriously affects the construction efficiency, and has high cost. SUMMARY

[0005] The present application provides a multistage strong cut rotary mixing aerator and its application in sewage treatment, which solves the above-mentioned problems in the prior art. Based on the internal structure of the multistage strong cut rotary mixing aerator with this special design, the inlet is not designed with a microporous structure, which avoids the problem of easy clogging caused by microporous holes, and at the same time, excellent aeration effect can be obtained. Moreover, under this premise, its installation method is completely different from the prior art of uniformly arranging aerators on the bottom according to the area. In sewage treatment, the number of aerators used is greatly reduced, which can greatly reduce the consumption of aerators and the energy consumption of water treatment, and is beneficial to greatly reducing the aeration cost.

[0006] The technical scheme for solving the above technical problems of the application is as follows: the application of a multi-stage strong-cut rotary mixing aerator in sewage treatment, characterized in that the multi-stage strong-cut rotary mixing aerator comprises an aerator body, the aerator body comprises a straight-cylinder guide cylinder and a rotary flow assembly and an air inlet pipe fixedly installed inside the guide cylinder, the guide cylinder is of an open structure at both ends, the rotary flow assembly comprises three helical blades arranged in sequence along the axial direction of the guide cylinder, and the adjacent two helical blades are connected end to end and arranged in a rotary staggered manner; the air inlet pipe is fixed to the lower side of the rotary flow assembly, the air inlet pipe is connected to the outside of the guide cylinder and is provided with an air inlet, and the air inlet pipe is provided with an air outlet communicated with the inner cavity thereof on the pipe wall at the lower side of the rotary flow assembly, and a preset distance is left between the air inlet pipe provided with the air outlet and the lower end of the guide cylinder. The multi-stage strong-cut rotary mixing aerator is applied to sewage treatment, and the method is as follows: at least two aerator bodies are arranged at intervals along the x direction and connected through air inlet pipes to form an aerating unit arranged linearly along the x direction, and the aerating unit is arranged in a sewage treatment tank during operation, and the aerating unit is taken as a baseline to radiate in the y direction to form an aerating radiation area.

[0007] Further, the air inlet pipe penetrates the side wall of the guide cylinder and extends outward.

[0008] Further, the air outlet is directed in a downward oblique direction, preferably at an angle of 45 degrees, that is, the direction of the air outlet forms an angle of 45 degrees with the axial direction of the air inlet pipe.

[0009] Further, the air outlet is provided with a plurality of air outlets arranged at non-bottom wall positions of the air inlet pipe.

[0010] Further, the helical angle of each helical blade from the bottom to the top is 90 degrees.

[0011] Further, the three helical blades are sequentially a first helical blade, a second helical blade and a third helical blade from bottom to top, the second helical blade is rotated and staggered by 90 degrees relative to the first helical blade around the guide cylinder axis, and the third helical blade is rotated and staggered by 90 degrees relative to the second helical blade around the guide cylinder axis.

[0012] Further, the guide cylinder is provided with a support frame fixed to the outer wall thereof at both sides, the rotary flow assembly is fixedly connected with a connecting edge strip at the top, the helical blade at the top is fixedly connected with the support frame through the connecting edge strip, and the support frame is bent to form a support base at the bottom.

[0013] The application has the following beneficial effects: 1. The multi-stage strong shear rotating mixing aerator of the present application is characterized by the structure of the aerator body mainly composed of a flow guide cylinder, a rotating assembly and an air inlet pipe. In particular, the rotating assembly is composed of three spiral vanes, and the adjacent two spiral vanes are connected end to end and arranged in a rotating staggered manner. The air outlet is designed in a slanting downward direction and is connected to the air inlet pipe. The mixture of sludge and water in the pool flows at a high speed in a circular manner around the aerator as the aeration center, which washes the pool bottom and pool wall, realizes the longitudinal mixing of the sewage pool, avoids the accumulation of sludge on the pool bottom, guarantees the aeration effect, and avoids the use of micro-porous structure, thereby avoiding the problem of sludge easily blocking the pores, and reducing the product failure rate. At the same time, the strong water flow impact and the high-speed circular flow process play a shearing effect on the foam in the aeration tank, forcing the foam to break, greatly reducing the accumulation of foam, and reducing the use of defoaming agents.

[0014] 2. Based on the multi-stage strong shear rotating mixing aerator of the present application, the present application proposes to apply it to water treatment, and in particular, creatively proposes a specific installation method of the aerator in the water treatment pool. Specifically, at least two aerator bodies are arranged along the x direction and connected by air inlet pipes to form an aerator unit arranged linearly along the x direction. During operation, the aerator unit is placed in the sewage treatment pool, and the aerator unit is taken as the baseline to radiate along the y direction to form the aeration radiation area. Unlike the prior art, the aerator is uniformly arranged according to the area of the pool bottom. The consumption of the aerator is significantly reduced, and the service area of a single aerator is significantly increased. When applied to a large water treatment pool, the service area of a single aerator can be as high as 12 square meters, greatly reducing the cost of the aerator.

[0015] 3. Through the linear arrangement installation method and the consumption of the multi-stage strong shear rotating mixing aerator of the present application, the construction period of the aerator is short, and for some old aeration tanks whose surface is covered with concrete and only a rectangular maintenance opening is left at the top side of the aeration tank, the aerator can be arranged and installed through the maintenance opening without digging the top cover, greatly reducing the requirements for construction conditions (in the case of the prior art, the aerators are uniformly arranged according to the area of the pool bottom, and the installation of all aerators can be realized through the maintenance opening), and expanding the application range of the aerator. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of the aerator body of an embodiment of the present application (without a support frame); Figure 2 is a sectional structural schematic diagram of the aerator body of an embodiment of the present application; Figure 3 is a structural schematic diagram of the air inlet pipe and the flow guide cylinder in a top view state of an embodiment of the present application; Figure 4 is a structural schematic diagram of the rotating assembly of an embodiment of the present application; Figure 5is a structural schematic diagram of an aeration unit according to an embodiment of the present application; Figure 6 is a schematic diagram (top view) of the arrangement of the aerator according to embodiment 1 of the present application in a water treatment tank; Figure 7 is a schematic diagram (top view) of the arrangement of the aerator according to comparative example 1-1 of the present application in a water treatment tank; Figure 8 is a schematic diagram (top view) of the arrangement of the aerator according to comparative example 1-2 of the present application in a water treatment tank; Figure 9 is a schematic diagram (top view) of the arrangement of the aerator according to embodiment 2 of the present application in a water treatment tank; Figure 10 is a schematic diagram (top view) of the arrangement of the aerator according to embodiment 3 of the present application in a water treatment tank; In the figure: 100. aerator body, 200. aeration unit, 300. biochemical tank, 1. flow guide cylinder, 2. cyclone assembly, 3. air inlet pipe, 31. air outlet, 4. first spiral blade, 5. second spiral blade, 6. third spiral blade, 7. support frame, 8. connecting edge strip, 9. support base. DETAILED DESCRIPTION

[0017] The principles and features of the present application will be described below, and the examples are only used to explain the present application and are not intended to limit the scope of the present application.

[0018] As shown in the accompanying drawings, the multi-stage strong-cut cyclone mixing aerator according to the present embodiment is specifically a three-stage strong-cut cyclone mixing aerator, which comprises an aerator body 100, the aerator body 100 comprising a straight-cylinder type flow guide cylinder 1 and a cyclone assembly 2 and an air inlet pipe 3 fixedly installed inside the flow guide cylinder 1, the flow guide cylinder 1 being of an open-ended structure with an inlet at the bottom and an outlet at the top.

[0019] The cyclone assembly 2 comprises three spiral blades of the same structure arranged in sequence along the axis of the flow guide cylinder 1, the rotation track of the cyclone assembly being adapted to the inner diameter of the flow guide cylinder, wherein the spiral angle of each spiral blade from the bottom to the top is 180°, the three spiral blades being the first spiral blade 4, the second spiral blade 5 and the third spiral blade 6 in sequence from bottom to top, and the adjacent two spiral blades being connected end to end and arranged in rotational stagger.

[0020] The air inlet pipe 3 is fixed to the lower side of the cyclone assembly 2, penetrates the side wall of the flow guide cylinder 1 and extends outward to the outside of the flow guide cylinder 1, and the air inlet thereof is arranged outside the flow guide cylinder 1 and located at the lower side of the cyclone assembly 2. The air outlet 31 is arranged on the pipe wall of the air inlet pipe 3 and communicates with the inner cavity thereof. In the embodiment, the air outlet 31 is arranged in two groups along the axial direction of the air inlet pipe 3, each group has two air outlets and is located on the side wall of the air inlet pipe 3 rather than the bottom wall, and each air outlet is arranged in a staggered manner. Each air outlet is inclined downward by 45°, that is, the direction of the air outlet 31 forms an angle of 45° with the axial direction of the air inlet pipe 3. The air inlet pipe 3 provided with the air outlet 31 is spaced apart from the lower end of the flow guide cylinder 1 by a predetermined distance, and the space between the lower side of the air inlet pipe 3 and the inner bottom of the flow guide cylinder 1 serves as a sludge initial mixing area.

[0021] In a preferred embodiment of the present application, in order to facilitate the processing and rapid installation of the aerator body 100, support frames 7 are arranged on the two sides of the flow guide cylinder 1 and fixed to the outer wall thereof. A connecting edge strip 8 is fixed to the top of the cyclone assembly 2. The helical blades at the top are fixedly connected to the support frames 7 through the connecting edge strip 8. Specifically, the connecting edge strip 8 is in a U shape, the bottom edge thereof is fixedly connected to the top of the third helical blade 6 through a bolt, and the two side edges thereof are fixedly connected to the support frames 7 arranged on the two sides of the aerator body 100 through bolts. The bottom of the support frame 7 is bent to form a support base 9, and the support base 9 is lower than the bottom inlet of the flow guide cylinder 1.

[0022] After the aeration operation, the gas is sprayed out through the air inlet pipe 3 and the air outlet 31, and a corresponding negative pressure area is generated in the bottom area of the flow guide cylinder. Thus, the 180° helical blades at the bottom of the pool are sucked in for flow shearing. The two helical blades are arranged in a head-to-tail and rotationally staggered manner by 90°, thereby forming strong mixing and stirring shearing. The mixture of sludge, water and gas in the pool flows at a high speed in a circular manner around the aerator as the aeration center, and washes the pool bottom and the pool wall, thereby realizing longitudinal mixing of the sewage pool. The inlet aperture of the bottom of the flow guide cylinder 1 is large, compared with the micro-porous aerator of the prior art, the aperture of which is micron-level, the use of the micro-porous structure is avoided, and thus the problem that the sludge is easy to block the pores is avoided. In addition, the sludge, water and gas in the sewage pool can be mixed longitudinally for N times, the service area of a single aerator is as high as 12 square meters, the oxygen transfer efficiency is higher than 30%, the aerator provides extremely stable oxygen supply conditions for the stable operation of the sewage treatment system, and the dynamic resistance loss of the aerator is less than 5 KPa, and the energy consumption is low.

[0023] In addition, for the treatment of toxic and harmful high-concentration wastewater, serious foam accumulation is often formed on the surface of the biochemical pool, and sometimes a defoaming agent needs to be added for defoaming to maintain the operation of the system. The aerator has a unique structure and the above-mentioned action principle, forms an aeration center on the surface of the sewage pool, and the foam in the aeration pool is sheared and forced to break in the process of strong water flow impact and high-speed circular flow, thereby reducing the foam accumulation and reducing the use of the defoaming agent.

[0024] The embodiment avoids the design of the microporous structure, so that the problems of easy damage, high failure rate and low product life caused by the microporous structure can be greatly reduced. The flow guide cylinder 1 and other components can be made of PVC, PE or PP according to different water qualities in the use environment, and the service life can reach 10 years.

[0025] The multi-stage strong-cut rotary mixing aerator is applied to sewage treatment, and the method is as follows: at least two aerator bodies are arranged at intervals along the x direction and connected through air inlet pipes to form an aerator unit arranged linearly along the x direction; during operation, the aerator unit is placed in a sewage treatment tank, and an aeration radiation area of the aerator unit is formed along the y direction based on the aerator unit as a baseline.

[0026] Application case Implementation case 1-1 Application scenario: domestic sewage treatment tank, specification: 4.8*3.2*5m.

[0027] The aerator adopts the above embodiment, and the length of a single aerator is 1200mm and the diameter is 230mm.

[0028] Installation method: single row * 4 aerators, placed vertically 200mm from the bottom of the tank, i.e. four aerators are arranged in a straight line to form an aerator unit, the air inlet pipes at both ends of the aerator unit are led upward, the aerator unit is 1m away from the single long side of the water treatment tank, and the centers of the aerators are 1.2m apart from each other, as shown in the accompanying Figure 6 .

[0029] Aerator consumption: 4, single aerator service area (aeration tank surface area / aerator number) 3.84m 2 . Aeration effect characterization: oxygen utilization efficiency 30% or more, aeration rate 0.5-3m³ / min / individual.

[0030] Comparison case 1-1 The disc-shaped microporous aerator of the prior art is purchased in model DP-215-EPDM.

[0031] Installation method: uniform distribution at the bottom of the tank, as shown in the accompanying Figure 7 ; The application scenario and aeration conditions are the same as those of implementation case 1-1.

[0032] Aerator consumption: 54, single aerator service area 0.28m 2 ; Aeration effect characterization: oxygen utilization efficiency 20%, aeration rate 0.13-0.25m³ / min / individual.

[0033] Comparison case 1-2 The tubular aerator of the prior art is purchased in model YX-TUB-100; Installation method: evenly distributed at the bottom of the pool, every 4 aerators as a group, and controlled by the same air inlet pipe, a total of 6 groups, see Figure 8 ; Application scenario and aeration condition are the same as application case 1-1; Aerator consumption: 24, single aerator service area 0.64m 2 .

[0034] Aeration effect characterization: oxygen utilization efficiency 25%, aeration volume 0.16-0.25m³ / min / root.

[0035] Comparison: in the above application scenario, i.e. the aerator is applied to a small domestic sewage treatment tank with a size of 4.8*3.2*5m, the aerator of the application is used in combination with the linear arrangement installation method for aeration treatment, compared with the existing technology of disc type micro-porous aerator and pipe type aerator which must be evenly distributed at the bottom of the pool, the service area of a single aerator is significantly improved, the consumption of aerators is significantly reduced, and the oxygen utilization efficiency of the application is higher.

[0036] Implementation case 2 Application scenario: organic amine production wastewater treatment tank, size: 30.6*18*6m.

[0037] The aerator of the above embodiment is used, the single aerator has a length of 1200mm and a diameter of 230mm; Installation method: 24 aerators * 2 rows, along the long side direction of the sewage tank, double rows are arranged side by side in the middle of the tank, see Figure 9 , the aerator is 200mm away from the bottom of the tank, and the centers of two aerators are spaced apart by 1.2m, wherein every three aerators form an aeration unit, see Figure 5 , the air inlet pipes at both ends of each aeration unit are led upward and aerated separately, and the air volume is controlled by a valve.

[0038] Total aerator consumption: 48, single aerator service area 11.475m 2 .

[0039] Aeration effect characterization: oxygen utilization efficiency 30% or more, aeration volume 1-3m³ / min / each, and the outlet pressure of the on-site fan is 55kPa.

[0040] Comparison case 2-1 Pipe type aerator, commercially available model YX-TUB-100; Installation method: same as comparison case 1-2, evenly distributed at the bottom of the pool; Aerator consumption: 60 groups * 4 roots = 240 roots, single aerator service area 2.295m 2 .

[0041] Aeration effect characterization: oxygen utilization efficiency less than 10%, ventilation volume 0.16-0.25 m3 / min / root, and field fan outlet pressure 65 kPa.

[0042] Comparative illustration: in the above application scenario, i.e., the aeration device is applied to a large-scale organic amine production wastewater treatment tank with a size of 30.6*18*6 meters, the aeration treatment is performed by using the aeration device of the present application and in combination with the linear arrangement installation mode, compared with the prior art pipe-type aeration device which must be uniformly distributed on the tank bottom, the service area of a single aeration device is significantly improved, the consumption of the aeration device is significantly reduced, and the oxygen utilization efficiency of the present application is higher, and the resistance loss of the aeration device is smaller.

[0043] Implementation case 3 Application scenario: organic amine production wastewater treatment tank, size: 18*12*6 meters.

[0044] The aeration device of the above embodiment is adopted, the length of a single aeration device is 1200 mm, and the diameter is 230 mm; Arrangement of the aeration device: 18 aeration devices are arranged in a single row in the center along the long side direction of the sewage tank, as shown in Figure 9 , the aeration devices are 200 mm away from the tank bottom, the centers of two aeration devices are spaced apart by 1 meter, three aeration devices form an aeration unit, as shown in Figure 5 , the air inlet pipes at both ends of each aeration unit are led upward and individually aerated, and the air volume is controlled by a valve.

[0045] Total consumption of the aeration device: 18, service area of a single aeration device: 12 m 2 . Installation mode: single-row aeration unit, 200 mm away from the tank bottom; Aeration effect characterization: oxygen utilization efficiency more than 30%, ventilation volume 1-3 m3 / min / each, and field fan outlet pressure 55 kPa.

[0046] Comparative case 3-1 The pipe-type aeration device of the prior art is adopted, and the commercially available model YX-TUB-100 is used; Installation mode: same as comparative case 1-2, uniformly distributed on the tank bottom; Consumption of the aeration device: 36 groups*4 roots=144 roots, service area of a single aeration device: 1.5 m 2 .

[0047] Aeration effect characterization: oxygen utilization efficiency less than 10%, ventilation volume 0.16-0.25 m3 / min / root, and field fan outlet pressure 65 kPa.

[0048] Compared with the prior art, the service area of a single aerator is significantly improved, the consumption of the aerator is significantly reduced, the oxygen utilization efficiency is higher, and the resistance loss of the aerator is smaller.

[0049] As can be seen from the above embodiment cases 1-3 and the comparison case, based on the aerator structure of the application and in combination with the specific installation method of the aerator of the application, and different from the prior art of uniformly arranging aerators according to the bottom area of the water treatment tank, the two factors can significantly improve the service area of a single aerator, greatly reduce the number of aerators used, thereby reducing the aeration cost, and the construction period of installing the aerator is short; in addition, for some old aeration tanks whose surface is covered with concrete and only a long rectangular manhole is left on the side of the top of the aeration tank, the installation method of embodiment case 1 can be used for single-row linear arrangement, at this time, the installation of the real-time aeration device can be realized without digging the top cover, greatly reducing the requirement for construction conditions and having wider applicability.

Claims

1. Use of a multi-stage strong-cyclone mixing-aerator in sewage treatment, characterized in that, The multistage strong-cut cyclone mixing aerator comprises an aerator body (100), the aerator body (100) comprises a straight-cylinder type flow guide cylinder (1) and a cyclone assembly (2) and an air inlet pipe (3) fixedly installed inside the flow guide cylinder (1), the flow guide cylinder (1) is of an open type structure at both ends, the cyclone assembly (2) comprises three spiral blades arranged in sequence along the axial direction of the flow guide cylinder (1), and the adjacent two spiral blades are connected end to end and arranged in a rotating staggered mode; the air inlet pipe (3) is fixed to the lower side of the cyclone assembly (2), the air inlet pipe (3) is communicated to the outside of the flow guide cylinder (1) and is provided with an air inlet, the air inlet pipe (3) is provided with an air outlet (31) communicated with the inner cavity thereof on the pipe wall at the lower side of the cyclone assembly (2), and a preset distance is left between the air inlet pipe (3) provided with the air outlet (31) and the lower end of the flow guide cylinder (1). The multistage strong-cut cyclone mixing aerator is applied to sewage treatment, and the method is that at least two aerator bodies are arranged at intervals along the x direction and connected through air inlet pipes to form an aerating unit arranged linearly along the x direction, and the aerating unit is arranged in a sewage treatment tank during operation, and the aerating unit is taken as a baseline to radiate along the y direction to form an aerating radiation area.

2. Use according to claim 1, characterized in that, The air inlet pipe (3) penetrates the side wall of the flow guide cylinder (1) and extends outward.

3. Use according to claim 1, characterized in that, The air outlet (31) faces a downward oblique direction.

4. Use according to claim 3, characterized in that, The direction of the air outlet (31) forms a 45° angle with the axial direction of the air inlet pipe (3).

5. Use according to claim 1 or 3 or 4, characterized in that, The air outlet (31) is provided with a plurality of air outlets.

6. Use according to claim 1 or 3 or 4, characterized in that, The air outlet (31) is arranged at a non-bottom wall position of the air inlet pipe (3).

7. Use according to claim 1, characterized in that, The spiral angle of each spiral blade from the bottom to the top is 180°.

8. Use according to claim 7, characterized in that, The three spiral blades are a first spiral blade (4), a second spiral blade (5) and a third spiral blade (6) arranged in sequence from bottom to top, the second spiral blade (5) is rotated and staggered by 90° around the axis of the flow guide cylinder (1) relative to the first spiral blade (4), and the third spiral blade (6) is rotated and staggered by 90° around the axis of the flow guide cylinder (1) relative to the second spiral blade (5).

9. The use according to claim 1, characterized in that, Support frames (7) fixed to the outer wall of the flow guide cylinder (1) are arranged at both sides of the flow guide cylinder (1), a connecting edge strip (8) is fixed to the top of the cyclone assembly (2), and the top spiral blade is fixedly connected with the support frames (7) through the connecting edge strip (8).

10. Use according to claim 9, characterized in that, The support frames (7) are bent to form support bases (9) at the bottom.

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