Efficient spiral degassing device for sewage treatment AOA process degassing area

Abstract

The utility model relates to an efficient spiral degassing device for a degassing area of a sewage treatment AOA process, which comprises a flow guide component and a spiral degassing component, the flow guide component comprises a flow guide plate, the flow guide plate is vertically arranged in the middle of the degassing area along the length direction of the degassing area, the upper end and the lower end of the flow guide plate are suspended, and the upper end of the flow guide plate is positioned below the liquid level of sewage in the degassing area; the aeration assembly comprises a first air pipe, a second air pipe and a fan which are sequentially communicated, the fan supplies air to the first air pipe through the second air pipe, a plurality of air holes are formed in the first air pipe, and the first air pipe is horizontally erected on one side of the flow guide plate in the length direction of the degassing area. Through the arrangement, sewage can form a spiral flowing path, so that the degassing efficiency is improved, and the aim of efficiently removing nitrogen in water is fulfilled; aeration bubbles can wash nitrogen on the surface of sludge, can blow nitrogen dissolved in water, can increase dissolved oxygen in water, inhibits denitrification of a sedimentation tank and reduces nitrogen generation, and the sludge is not prone to floating upwards, so that the sludge-water separation effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a high-efficiency spiral degassing device used in a degassing zone of an AOA process for sewage treatment. Background Art

[0002] The AOA (Anaerobic-Oxic-Anoxic) process is a highly efficient deep denitrification process for urban sewage. Its design is based on the metabolic characteristics of different microorganisms and combines the alternating switching of anaerobic, aerobic and anoxic environments to achieve efficient degradation of organic matter and nitrogen and phosphorus in sewage. It has the advantages of high efficiency and low consumption.

[0003] In the traditional AOA process, sewage first enters the anaerobic zone, where anaerobic degradation of organic matter and phosphorus release reactions occur, and large-molecule organic matter is converted into small-molecule organic matter and intracellular carbon sources. It then flows into the aerobic zone, where nitrification reactions occur, and ammonia nitrogen is converted into nitrate nitrogen. After that, the mud-water mixture enters the anoxic zone to complete the denitrification reaction, thereby reducing nitrate to nitrogen gas and achieving a denitrification effect. After treatment in the anaerobic, aerobic and anoxic zones, the mud-water mixture flows into the secondary sedimentation tank, where gravity sedimentation is used to achieve mud-free water separation. Because a small amount of nitrogen still remains attached to the surface of the anoxic sludge, or a small amount of nitrate nitrogen undergoes denitrification in the anoxic tank, the sedimentation of the secondary sedimentation tank is poor, and the mud-water separation effect needs to be improved.

[0004] To further enhance the sludge-water separation efficiency in the AOA process's secondary sedimentation tank, a degassing zone is added between the anoxic zone and the secondary sedimentation tank. The degassing device in this zone removes nitrogen bubbles adhering to the sludge surface, improving sludge settling and thus enhancing the sludge-water separation efficiency in the secondary sedimentation tank. However, conventional degassing devices often suffer from low degassing efficiency and incomplete gas removal, making them unable to fully meet the requirements for efficient degassing. Utility Model Content

[0005] In order to solve the above-mentioned defects, the utility model proposes a high-efficiency spiral degassing device for the degassing zone of the AOA process for sewage treatment.

[0006] The technical solution adopted by the utility model is a high-efficiency spiral degassing device for the degassing zone of the AOA process for sewage treatment, comprising:

[0007] A guide assembly, comprising a guide plate, the guide plate being vertically arranged in the middle of the degassing zone along the length direction of the degassing zone, the upper and lower ends of the guide plate being suspended in the air, and the upper end of the guide plate being located below the liquid level of the sewage in the degassing zone;

[0008] The aeration assembly includes an air pipe 1, an air pipe 2 and a fan connected in sequence. The fan supplies air to the air pipe 1 through the air pipe 2. The air pipe 1 is provided with a plurality of air holes. The air pipe 1 is horizontally mounted on one side of the guide plate along the length direction of the degassing zone.

[0009] Preferably, the guide plate is installed at ¾ of the width of the degassing zone, and the air pipe is arranged on a side of the guide plate closer to the degassing zone.

[0010] Preferably, the upper end of the guide plate is inclined toward a side away from the air pipe.

[0011] Preferably, the air hole is opened on a side of the air pipe close to the guide plate, and the axis of the air hole is parallel to the inclination direction of the guide plate.

[0012] Preferably, the air holes are opened vertically downward along the upper edge of the trachea, or the air holes are opened horizontally on both sides along the upper edge of the trachea.

[0013] Preferably, the aeration assembly further comprises:

[0014] A gas flow meter is provided at the connection between the blower and the second gas pipe and is used to monitor the gas flow delivered by the blower;

[0015] A gas flow intelligent control valve is arranged downstream of the gas flow meter and connected in series with the second gas pipe. The gas flow intelligent control valve adjusts the gas flow output by the second gas pipe according to the flow data transmitted by the gas flow meter.

[0016] Preferably, the fan is a variable frequency fan.

[0017] Preferably, a plurality of guide holes are provided on the guide plate.

[0018] Preferably, the guide assembly further includes a bracket, and the bottom end and side surfaces of the guide plate are connected to the inner wall of the degassing zone through the bracket.

[0019] Preferably, a plurality of guide plates and aeration components are respectively provided along the vertical direction of the degassing zone, two adjacent guide plates are arranged at intervals, and one aeration component is provided opposite to one guide plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The spiral degassing device of the present invention utilizes a flow guide assembly to create a spiral flow path as sewage passes through the guide plate. Furthermore, an aeration assembly is provided, and the aeration effect of the air holes further guides the sewage flow into a spiral shape around the guide plate. The coordinated action of the flow guide assembly and the aeration assembly increases the residence time of the water flow and the contact area between the gas and the liquid, helping to release more dissolved gases (such as nitrogen) from the sewage. Instead of simply rising and escaping directly to the liquid surface, the bubbles rotate with the water flow, extending their residence time in the water and enhancing the gas flushing process, thereby improving degassing efficiency and achieving the goal of efficiently removing nitrogen from the water.

[0022] 2. The bubbles generated by aeration can not only directly flush the nitrogen attached to the surface of the sludge, but also blow off the nitrogen dissolved in the water. Aeration can also increase the dissolved oxygen in the water, inhibit the subsequent denitrification in the sedimentation tank, reduce the production of nitrogen, and make the sludge less likely to float, so that the mud-water separation effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0024] Figure 1 This is the front view of a high-efficiency spiral degasser used in the degassing zone of the AOA process for wastewater treatment;

[0025] Figure 2 This is a top view of a high-efficiency spiral degasser used in the degassing zone of the AOA process for wastewater treatment;

[0026] Figure 3 FIG. 1 is a cross-sectional view of trachea 1 in an embodiment.

[0027] 10. deflector; 11. bracket;

[0028] 20. Fan; 21. Trachea 1; 22. Trachea 2; 23. Air hole. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] In one embodiment, a high-efficiency spiral degassing device for the degassing zone of the AOA process for wastewater treatment includes a flow guide component and an aeration component. The flow guide component is used to guide the flow of wastewater; the aeration component provides bubbles, which are used to flush nitrogen attached to the sludge and nitrogen dissolved in the water. At the same time, aeration can destroy the anoxic environment and prevent denitrification in the sedimentation tank. Figure 1-2 As shown, the deflector assembly includes a deflector plate 10, which is vertically positioned in the middle of the degassing zone along its length. The upper and lower ends of the deflector plate 10 are suspended in the air, and the upper end of the deflector plate 10 is located below the sewage level within the degassing zone, allowing the sewage to flow freely from both ends of the deflector plate 10. The upper end of the deflector plate 10 is positioned below the sewage level, allowing the deflector plate 10 to effectively guide the sewage flow within the sewage and prevent premature release of gas at the liquid surface. The aeration assembly includes a sequentially connected air pipe 1 21, an air pipe 2 22, and a fan 20. The fan 20 delivers air to the air pipe 1 21 through the air pipe 2 22. The air pipe 1 21 is provided with a plurality of air holes 23. When the fan 20 delivers air, the gas enters the sewage from the air pipe 1 21 through the air holes 23, forming small bubbles. As the bubbles rise in the sewage, they effectively capture dissolved nitrogen and flush nitrogen adhering to the sludge surface. The air pipe 21 is horizontally installed on one side of the guide plate 10 along the length direction of the degassing zone, so that under the action of the guide plate 10 and the gas in the air hole 23, the flow of sewage in the degassing zone is guided into a spiral shape. Figure 1 The arrows in the figure indicate the circulation paths of bubbles and water flow. Figure 2 The middle arrows indicate the path of water flow in and out of the degassing zone.

[0031] The spiral degassing device in this embodiment employs a flow guide assembly to create a spiral flow path as the sewage passes through the flow guide plate 10. The aeration assembly further directs the flow of sewage into a spiral around the flow guide plate 10 through the aeration holes 23. The combined action of the flow guide assembly and the aeration assembly increases the contact area between gas and liquid, facilitating the release of more dissolved gases (such as nitrogen) from the sewage. Furthermore, bubbles do not simply rise and escape directly from the liquid surface, but instead rotate with the water flow, extending their residence time in the water and enhancing the gas release and mixing process. This improves degassing efficiency and effectively removes nitrogen and other gases from the water.

[0032] In addition, the bubbles produced by aeration can not only directly flush the nitrogen attached to the surface of the sludge, but also blow off the nitrogen dissolved in the water. Aeration can also increase the dissolved oxygen in the water, inhibiting subsequent denitrification in the sedimentation tank, reducing the production of nitrogen, and making the sludge less likely to float, resulting in better mud-water separation effect.

[0033] In one embodiment, the guide plate 10 is set at 3 / 4 of the width of the degassing zone, that is, the guide plate 10 is not located in the middle of the degassing zone, but is offset to one side, closer to the wall of one side of the degassing zone and farther from the wall of the other side of the degassing zone. This offset setting creates a wide water flow channel and a relatively narrow water flow channel. The air pipe 1 21 is set on the side of the guide plate 10 closer to the degassing zone, that is, in the narrower water flow channel. The water flow in the narrower water flow channel is more concentrated. Most of the water flow here can come into contact with the gas ejected from the air pipe 1 21, promoting the more complete release of dissolved gases such as nitrogen in the water. The offset design of the guide plate 10 combined with the position of the air pipe 1 21 will generate strong disturbances when the water flows through the guide plate 10. Especially when bubbles are continuously released, the water flow will further form a spiral and turbulent state, which not only promotes the release of gas, but also prevents bubbles from floating up quickly, helping to further improve the degassing efficiency.

[0034] In one embodiment, the upper end of the guide plate is tilted toward the side away from the air pipe. The tilt angle can be adjusted based on actual conditions, typically ranging from 10° to 30°. By tilting the guide plate, the flow of sewage within the degassing zone becomes more spiral, further enhancing contact between the water flow and the bubbles, extending the bubble retention time, and significantly improving the efficiency of degassing and denitrification. The overall structure is simple yet effective, effectively solving the problem of insufficient gas-liquid mixing in traditional degassing devices.

[0035] In one embodiment, the air hole is opened on one side of the air pipe close to the guide plate, and the axis of the air hole is parallel to the inclination direction of the guide plate, that is, the direction of gas ejection is consistent with the inclination direction of the guide plate, so that after the gas is released, it moves synchronously with the water flow along the inclination direction of the guide plate, reducing the resistance during the gas injection process and effectively increasing the contact area between the gas and the water body. The gas will not escape directly upward quickly, but will be guided by the guide plate and the water flow for a longer period of mixing and contact. The kinetic energy generated when the gas is released further pushes the water body to form a spiral movement path under the guidance of the guide plate, further improving the denitrification effect of the degassing device.

[0036] In one embodiment, Figure 3 As shown, air holes 23 are provided vertically downward on air pipe 1 21, that is, gas is ejected downward from the bottom of air pipe 1 21. Alternatively, air holes 23 are provided horizontally on both sides of air pipe 1 21, and gas is ejected from both sides of air pipe 1 21, forming a horizontal jet effect.

[0037] Upward-facing air holes often lead to clogging by impurities or sediment in the water. This is particularly true during sewage treatment, where the water may contain suspended solids, sludge, and other particulate matter, which can easily settle on the air hole surface and obstruct gas injection. In contrast, downward-facing or horizontally-facing air holes reduces the likelihood of these sediments entering the air holes, ensuring unimpeded gas injection and reducing the need for frequent cleaning and maintenance due to blockages. This extends the life of the device and reduces maintenance costs.

[0038] In one embodiment, the aeration assembly further includes a gas flow meter and an intelligent gas flow control valve. The gas flow meter is located at the connection between the fan 20 and the second gas pipe 22. The gas flow meter monitors the gas flow delivered by the fan 20 and transmits the data to the intelligent gas flow control valve. The intelligent gas flow control valve is located downstream of the gas flow meter and connected in series with the second gas pipe 22. Based on the flow data transmitted by the gas flow meter, the intelligent gas flow control valve automatically adjusts the gas flow output from the second gas pipe 22, thereby precisely controlling the amount of gas entering the first gas pipe 21. This ensures that the gas supply precisely matches the needs of the degassing zone and avoids excessive or insufficient gas supply.

[0039] By installing a gas flow meter and a gas flow intelligent control valve in the aeration component, real-time monitoring and precise control of the gas flow are achieved. This not only improves the accuracy of gas flow control and reduces dependence on manual operation, but also enhances the degassing effect, reduces energy consumption and maintenance costs, and improves the stability and operational flexibility of the device.

[0040] In one embodiment, the fan 20 is a variable frequency fan 20, which is equipped with a frequency converter. This converter allows the fan 20's speed to be adjusted based on actual demand, thereby controlling the gas flow rate and power of the fan 20. The variable frequency fan 20 can work in conjunction with a gas flow meter and an intelligent gas flow control valve to adjust the fan 20 speed based on the actual needs of the degassing zone to ensure that the gas flow rate meets the treatment requirements. When the system's aeration demand decreases, the variable frequency fan 20's speed will decrease, thereby reducing unnecessary energy consumption.

[0041] In one embodiment, the guide plate is provided with a plurality of diversion holes. The guide plate is subjected to pressure from the water flow. The provision of the diversion holes can achieve a certain degree of balance in the water pressure on both sides of the plate, preventing deformation or damage to the guide plate due to pressure differences and extending the service life of the device. Furthermore, the diversion holes on the guide plate can generate small-scale turbulence during the flow of sewage, further accelerating gas-liquid separation and improving degassing efficiency.

[0042] In one embodiment, the guide assembly also includes a bracket 11, which is usually fixed to the bottom and side of the guide plate 10 and connected to the inner wall of the degassing zone by bolts or welding. The bracket 11 will not affect the flow of water, but can also effectively support the weight of the guide plate 10 and the impact force of the water flow, thereby preventing the guide plate 10 from tilting, shaking or even falling off.

[0043] In one embodiment, multiple guide plates and aeration components are respectively arranged along the vertical direction of the degassing zone, with two adjacent guide plates arranged at intervals, and an aeration component is arranged opposite to a guide plate. Multiple guide plates and cooperating aeration components are arranged in layers in the vertical direction, and water flows at different heights form their own spiral flow paths in front of each guide plate. Through the synergistic effect of multiple guide plates and aeration components, multiple groups of spiral water flows are formed in the entire degassing zone, which are distributed at different height layers, which helps to evenly distribute bubbles in the entire degassing zone and avoid the situation where gas is concentrated in a certain area and cannot be completely removed. Multiple groups of spiral water flows can fully remove gas in sewage at different height layers and different positions, thereby effectively improving the overall degassing efficiency. It is suitable for large-flow sewage treatment scenarios, so that the degassing zone can meet the needs of high flow rate and large processing volume, and ensure a high treatment effect.

[0044] In this specification, the use of terms such as "Embodiment 1," "this embodiment," or "in one embodiment" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example; furthermore, the specific features, structures, materials, or characteristics described may be appropriately combined in any one or more embodiments or examples.

[0045] In the description of this specification, the terms "connect," "install," "fix," "dispose," and "have" are to be understood in a broad sense. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0046] In the description of this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.

[0047] The above description of the embodiments is to facilitate ordinary technicians in this technical field to understand and apply the technology of this case. People familiar with the technology in this field can obviously make various modifications to these examples easily and apply the general principles described here to other embodiments without having to go through creative work. Therefore, this case is not limited to the above embodiments. Modifications to the following situations should all be within the scope of protection of this case: ① A new technical solution implemented based on the technical solution of this utility model and combined with existing common knowledge, the technical effect produced by the new technical solution does not exceed the technical effect of this utility model; ② The equivalent replacement of some features of the technical solution of this utility model with common technology, the technical effect produced is the same as the technical effect of this utility model; ③ The technical solution of this utility model can be expanded, and the substantive content of the expanded technical solution does not exceed the technical solution of this utility model; ④ The equivalent transformation made by using the contents of the description and drawings of this utility model is directly or indirectly applied to other related technical fields.

Claims

1. A high-efficiency spiral degassing device for the degassing zone of the AOA process for sewage treatment, characterized in that: include: A guide assembly, comprising a guide plate, the guide plate being vertically arranged in the middle of the degassing zone along the length direction of the degassing zone, the upper and lower ends of the guide plate being suspended in the air, and the upper end of the guide plate being located below the liquid level of the sewage in the degassing zone; The aeration assembly includes an air pipe 1, an air pipe 2 and a fan connected in sequence. The fan supplies air to the air pipe 1 through the air pipe 2. The air pipe 1 is provided with a plurality of air holes. The air pipe 1 is horizontally mounted on one side of the guide plate along the length direction of the degassing zone.

2. The spiral degassing device according to claim 1, characterized in that The guide plate is mounted at ¾ of the width of the degassing zone, and the air pipe 1 is arranged on a side of the guide plate closer to the degassing zone.

3. The spiral degassing device according to claim 2, characterized in that The upper end of the guide plate is inclined toward a side away from the air pipe.

4. The spiral degassing device according to claim 3, characterized in that The air hole is opened on a side of the air pipe close to the guide plate, and the axis of the air hole is parallel to the inclined direction of the guide plate.

5. The spiral degassing device according to claim 1, characterized in that The air holes are provided on an upper side of the trachea in a vertical direction downward, or the air holes are provided on an upper side of the trachea in a horizontal direction toward both sides.

6. The spiral degassing device according to claim 1, characterized in that The aeration assembly further comprises: A gas flow meter is provided at the connection between the blower and the second gas pipe and is used to monitor the gas flow delivered by the blower; A gas flow intelligent control valve is arranged downstream of the gas flow meter and connected in series with the second gas pipe. The gas flow intelligent control valve adjusts the gas flow output by the second gas pipe according to the flow data transmitted by the gas flow meter.

7. The spiral degassing device according to claim 1, characterized in that The fan is a variable frequency fan.

8. The spiral degassing device according to claim 1, characterized in that A plurality of guide holes are provided on the guide plate.

9. The spiral degassing device according to claim 1, characterized in that The guide assembly further includes a bracket, and the bottom end and side surfaces of the guide plate are connected to the inner wall of the degassing zone through the bracket.

10. The spiral degassing device according to any one of claims 1 to 9, characterized in that: The guide plate A plurality of aeration components are provided along the vertical direction of the degassing zone, and two adjacent guide plates are arranged at intervals. One of the aeration components is arranged opposite to one of the guide plates.

Images