Spiral-flow aeration type biological fluidized bed domestic sewage treatment device

Abstract

The utility model discloses a rotational flow aeration type biological fluidized bed domestic sewage treatment device which comprises a shell, and a rotational flow aeration assembly, a microorganism fluidized bed layer and a three-phase separator are sequentially arranged in the shell from bottom to top; the spiral-flow aeration assembly comprises an annular aeration pipe, a plurality of aeration heads and an aeration pump, the annular aeration pipe is horizontally arranged at the bottom of the shell, the plurality of aeration heads are uniformly distributed on the annular aeration pipe, air outlets of the aeration heads are obliquely arranged upwards, and the annular aeration pipe is connected with the external aeration pump through an air inlet pipe; a central pipe is arranged in the center of the inner ring of the annular aeration pipe, a plurality of rotational flow plates are obliquely arranged on the central pipe, and the rotational flow plates are uniformly arranged at intervals in the circumferential direction of the central pipe. Through the synergistic effect of the spiral-flow aeration assembly and the biological fluidized bed layer and the design of the spiral fins and the three-phase separator, efficient aeration, uniform mixing and sludge internal circulation are realized, and the spiral-flow biological fluidized bed reactor has the characteristics of high treatment efficiency, low energy consumption and convenience in maintenance.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, and in particular to a vortex aeration biological fluidized bed domestic wastewater treatment device. Background Technology

[0002] With the acceleration of urbanization and the improvement of people's living standards, the discharge of domestic sewage is increasing day by day. Domestic sewage contains a large amount of pollutants such as organic matter, nitrogen, and phosphorus. If it is discharged directly without effective treatment, it will cause serious environmental pollution.

[0003] Biological fluidized bed wastewater treatment technology is a highly efficient wastewater treatment technology that utilizes the metabolism of microorganisms to degrade pollutants in wastewater by filling a fluidized bed with microbial carriers. However, existing biological fluidized bed wastewater treatment devices have some problems. For example, uneven aeration prevents microorganisms from fully contacting wastewater and oxygen, affecting the wastewater treatment effect; the flow pattern of wastewater within the fluidized bed is not ideal, with phenomena such as short-circuiting and dead zones, reducing the contact time and contact area between wastewater and the microbial carriers, resulting in low pollutant removal efficiency; at the same time, some devices have complex structures and high operating and maintenance costs. Therefore, there is an urgent need to design a new type of biological fluidized bed domestic wastewater treatment device to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a vortex aeration biological fluidized bed domestic sewage treatment device to solve the problems in the prior art, such as uneven aeration, which leads to insufficient contact between microorganisms and sewage and oxygen, thus affecting the sewage treatment effect.

[0005] To achieve the aforementioned objectives, the technical solution of this utility model is as follows:

[0006] A swirl-aerated biological fluidized bed wastewater treatment device includes a shell. The top of the shell has a wastewater outlet, the bottom has a sludge discharge outlet, and the lower side wall has a water inlet. Inside the shell, from bottom to top, a swirl aeration assembly, a microbial fluidized bed, and a three-phase separator are arranged sequentially. The swirl aeration assembly includes an annular aeration pipe, several aeration heads, and an aeration pump. The annular aeration pipe is horizontally arranged at the bottom of the shell and fixedly connected to the inner wall of the shell. Several aeration heads are evenly distributed on the annular aeration pipe, and the air outlets of the aeration heads are inclined upwards. The annular aeration pipe is connected to an external aeration pump through an air inlet pipe. A central pipe is arranged at the center of the inner circle of the annular aeration pipe. Several swirl plates are inclinedly arranged between the central pipe and the annular aeration pipe, and the swirl plates are evenly spaced along the circumference of the central pipe, forming a first water flow channel between adjacent swirl plates.

[0007] Preferably, the swirl aeration assembly includes fins fixed to the inner wall of the shell and spirally inclined upwards, with the angle of the fins gradually increasing from bottom to top.

[0008] Preferably, the lower end of the central tube is connected to the annular aeration tube, and the upper end of the central tube is connected to an aerator.

[0009] Preferably, the angle between the air outlet of the aeration head and the horizontal plane is 30° to 60°.

[0010] Preferably, the microbial fluidized bed includes a filter plate and a microbial carrier located above the filter plate. A baffle plate is inclinedly arranged below the filter plate along its length, and a second water flow channel is formed between adjacent baffle plates. Several elastic three-dimensional packing materials are suspended on the downward-facing side of the baffle plate.

[0011] Preferably, an outer shell is provided on the upper end of the shell, a reflux zone is formed between the outer shell and the shell, the sewage outlet is connected to the reflux zone, the lower end of the reflux zone is connected to the lower part of the microbial fluidized bed, and an overflow port is provided on the inner side wall of the outer shell.

[0012] Preferably, the three-phase separator includes a conical separation hood and a gas collection chamber. The large end of the conical separation hood is fixedly connected to the inner wall of the processing tank, and the small end faces upward. The gas collection chamber is located above the conical separation hood and is fixedly connected to the top of the shell. The gas collection chamber is provided with a biogas outlet.

[0013] Preferably, the microbial carrier is a porous ceramic-activated carbon composite structure.

[0014] Preferably, the fin surface is coated with a nano-hydrophobic coating.

[0015] The beneficial effects of this utility model are:

[0016] 1. The inclined aeration head in this invention creates a swirling flow of wastewater within the treatment tank during aeration. The swirling plate further guides the wastewater in the middle to form a swirling flow, and the centrifugal force of the outward-spraying material further enhances the gas-liquid mixing efficiency with the aeration head, strengthening the swirling aeration effect. Furthermore, the aerator in the middle allows microorganisms to fully contact the wastewater and oxygen, simultaneously enhancing the mixing effect between wastewater and the microbial carrier, thus improving pollutant removal efficiency. During aeration, the wastewater forms a swirling flow within the treatment tank, achieving uniform aeration, allowing microorganisms to fully contact the wastewater and oxygen, while simultaneously enhancing the mixing effect between wastewater and the microbial carrier, thereby improving pollutant removal efficiency.

[0017] 2. The fins in this invention form a gradually changing swirling flow field, which enhances the gas-liquid cutting efficiency and improves oxygen utilization.

[0018] 3. The present invention is equipped with a baffle plate, which can change the direction of sewage flow again, increase the contact time and contact area between sewage and microbial carrier, and improve the pollutant removal efficiency; the elastic three-dimensional packing not only improves the biofilm adhesion efficiency, but also uses the dense arrangement of packing filaments to cut the large bubbles generated by aeration, forming micron-sized bubbles, prolonging the gas-liquid contact time, and significantly improving the oxygen transfer rate and utilization rate.

[0019] 4. In this utility model, an outer shell is provided outside the shell to form a reflux zone. The sewage outlet is connected to the reflux zone. The lower end of the reflux zone is connected to the bottom of the microbial fluidized bed to realize the internal circulation of sludge, continuously replenish the number of microorganisms, and ensure that there is always sufficient biomass in the shell to degrade organic matter. The microorganisms carried by the refluxed sludge participate in the nitrification, denitrification and polyphosphate accumulation processes to achieve the simultaneous removal of nitrogen and phosphorus. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram showing the connection between the annular aeration pipe and the swirl plate.

[0022] In the picture:

[0023] 1. Shell; 11. Wastewater outlet; 12. Sludge discharge outlet; 13. Inlet; 2. Swirl aeration assembly; 21. Annular aeration pipe; 22. Aeration head; 23. Aeration pump; 24. Central pipe; 25. Swirl plate; 26. Aerator; 3. Fins; 4. Microbial fluidized bed; 41. Filter plate; 42. Microbial carrier; 43. Baffle plate; 44. Elastic three-dimensional packing; 5. Three-phase separator; 51. Separation hood; 52. Gas collection chamber; 53. Biogas outlet; 6. Shell; 61. Return zone; 62. Overflow outlet. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0025] The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0026] Example 1

[0027] like Figure 1As shown, a vortex aeration biological fluidized bed domestic sewage treatment device includes a shell 1. The top of the shell 1 is provided with a sewage outlet 11, the bottom is provided with a sludge discharge outlet 12, and the lower side wall is provided with a water inlet 13. An outer shell 6 is provided outside the upper end of the shell 1, and a return zone 61 is formed between the outer shell 6 and the shell 1. The sewage outlet 11 is connected to the return zone 61, the lower end of the return zone 61 is connected to the shell 1, and an overflow outlet 62 is provided on the inner side wall of the outer shell 6.

[0028] like Figure 1 and Figure 2 As shown, the shell 1 contains, from bottom to top, a swirl aeration assembly 2, a microbial fluidized bed 4, and a three-phase separator 5. The swirl aeration assembly 2 includes an annular aeration pipe 21, several aeration heads 22, and an aeration pump 23. The annular aeration pipe 21 is horizontally positioned at the bottom of the shell 1 and fixedly connected to the inner wall of the shell 1. The several aeration heads 22 are evenly distributed on the annular aeration pipe 21, with their outlets angled upwards at an angle of 30° to 60° to the horizontal plane to reduce bubble resistance. The annular aeration pipe 21 is connected to the external aeration pump 23 via an air inlet pipe. A central pipe 24 is located at the center of the inner ring of the annular aeration pipe 21. The lower end of the central pipe 24 is connected to the annular aeration pipe 21, and the upper end of the central pipe 24 is connected to an aerator 26. Several swirl plates 25 are provided between the central pipe 24 and the annular aeration pipe 21. The swirl plates 25 are inclined and evenly spaced along the circumference of the central pipe 24, and a first water flow channel is formed between adjacent swirl plates 25.

[0029] like Figure 1 As shown, the swirl aeration assembly 2 includes fins 3 fixed to the inner wall of the shell 1 and spirally inclined upwards, with the angle of the fins 3 gradually increasing from bottom to top. The lower fins 3 are inclined at 30°, and the upper fins 3 are inclined at 45°. The surface of the fins 3 is coated with a nano-hydrophobic coating to reduce biofilm or sludge adhesion and prevent clogging.

[0030] like Figure 1 As shown, the microbial fluidized bed 4 includes a filter plate 41 and a microbial carrier 42 located above the filter plate 41. The microbial carrier 42 is a porous ceramic-activated carbon composite structure with a porosity ≥65% and a specific surface area of ​​3000 m². 2 / m 3 It has both adsorption and biodegradation functions. Below the filter plate 41, a baffle plate 43 is inclined along its length. The baffle plate 43 is inclined at 30°, and a second water flow channel is formed between adjacent baffle plates 43. Several elastic three-dimensional packing materials 44 are suspended on the downward-facing side of the baffle plate 43.

[0031] like Figure 1As shown, the three-phase separator 5 includes a conical separation hood 51 and a gas collection chamber 52. The large end of the conical separation hood 51 is fixedly connected to the inner wall of the processing tank, and the small end faces upward. The gas collection chamber 52 is located above the conical separation hood 51 and is fixedly connected to the top of the shell 1. The gas collection chamber 52 is provided with a biogas outlet 53.

[0032] In summary,

[0033] When the domestic sewage treatment device is in use, domestic sewage enters the shell 1 from the bottom inlet 13 and flows from bottom to top; the aeration pump 23 draws air into the annular aeration pipe 21 and discharges it from the aeration head 22 and aerator 26 respectively; the swirl plate 25 guides the sewage in the middle to form a swirling flow, which forms a multi-stage swirling flow with the swirling flow at the aeration head 22. The mixed sewage is first guided by the swirl of the fins 3 through the elastic three-dimensional packing 44, and then enters the microbial fluidized bed 4 zone for microbial treatment along the second water flow channel. The biogas produced enters the gas collection chamber 52 through the separation hood 51 and is finally discharged from the biogas outlet 53; the purified sewage is discharged into the return zone 61 from the sewage outlet 11 and then discharged from the overflow port 62; the sludge in the return zone 61 settles and re-enters the shell 1, realizing the internal circulation of sludge.

[0034] The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A vortex aeration biological fluidized bed domestic sewage treatment device, comprising a shell, wherein the top of the shell is provided with a sewage outlet, the bottom with a sludge discharge outlet, and the lower side wall with a water inlet, characterized in that, The shell contains, from bottom to top, a swirl aeration assembly, a microbial fluidized bed, and a three-phase separator; The swirl aeration assembly includes an annular aeration pipe, several aeration heads, and an aeration pump. The annular aeration pipe is horizontally arranged at the bottom of the shell and fixedly connected to the inner wall of the shell. Several aeration heads are evenly distributed on the annular aeration pipe, and the air outlets of the aeration heads are inclined upwards. The annular aeration pipe is connected to the external aeration pump through an air inlet pipe. A central pipe is provided at the center of the inner circle of the annular aeration pipe. Several swirl plates are inclinedly arranged between the central pipe and the annular aeration pipe, and the swirl plates are evenly spaced along the circumference of the central pipe, forming a first water flow channel between adjacent swirl plates.

2. The swirl-aerated biological fluidized bed domestic sewage treatment device according to claim 1, characterized in that, The swirl aeration assembly includes fins fixed to the inner wall of the shell and spirally inclined upwards, with the angle of the fins gradually increasing from bottom to top.

3. The swirl-aerated biological fluidized bed domestic sewage treatment device according to claim 2, characterized in that, The lower end of the central tube is connected to the annular aeration tube, and the upper end of the central tube is connected to an aerator.

4. The swirl-aerated biological fluidized bed domestic sewage treatment device according to claim 3, characterized in that, The angle between the air outlet of the aeration head and the horizontal plane is 30° to 60°.

5. The swirl-aerated biological fluidized bed domestic sewage treatment device according to claim 3, characterized in that, The microbial fluidized bed includes a filter plate and a microbial carrier located above the filter plate. A baffle plate is inclinedly arranged below the filter plate along its length, and a second water flow channel is formed between adjacent baffle plates. Several elastic three-dimensional packing materials are suspended on the downward-facing side of the baffle plate.

6. The swirl-aerated biological fluidized bed domestic sewage treatment device according to claim 5, characterized in that, An outer shell is provided on the upper end of the shell, and a reflux zone is formed between the outer shell and the shell. The sewage outlet is connected to the reflux zone, and the lower end of the reflux zone is connected to the lower part of the microbial fluidized bed. An overflow port is provided on the inner side wall of the outer shell.

7. The swirl-aerated biological fluidized bed domestic sewage treatment device according to claim 6, characterized in that, The three-phase separator includes a conical separation hood and a gas collection chamber. The large end of the conical separation hood is fixedly connected to the inner wall of the processing tank, and the small end faces upward. The gas collection chamber is located above the conical separation hood and is fixedly connected to the top of the shell. The gas collection chamber is provided with a biogas outlet.

8. The swirl-aerated biological fluidized bed domestic sewage treatment device according to claim 5, characterized in that, The microbial carrier is a porous ceramic-activated carbon composite structure.

9. The swirl-aerated biological fluidized bed domestic sewage treatment device according to claim 7, characterized in that, The fin surface is coated with a nano-hydrophobic coating.

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