A defoaming device for a sewage treatment biochemical tank

Abstract

The utility model provides a kind of sewage treatment biochemical pool defoaming device, including water inlet device and water distribution pipeline system, and the water inlet pipeline of water inlet device is equipped with filter screen;Water distribution pipeline system includes water distribution main pipe, water distribution branch pipe, shunt branch pipe and defoaming spray pipe;Water distribution main pipe connects outlet pipeline;Water distribution branch pipe connects water distribution main pipe, and water distribution branch pipe is annular pipe, and is arranged on the top of the edge of sewage treatment biochemical pool;Defoaming spray pipe connects water distribution branch pipe, and with horizontal plane presents angle of 30-50 degrees;Defoaming spray pipe includes a reducing tee, a De50 pipe clamp, a 45 ° De50 elbow, a De50 ball valve, a De50 / 32 reducing direct, a De32 live joint, a De32 plug, several De50 PVC pipelines and several De32 PVC pipelines;And De32 PVC pipeline is perpendicular to axial at the place of distance plug 20~30cm and is opened with the "Chinese" strip-shaped spout.It is improved to prevent the performance and defoaming efficiency by the optimization of defoaming device, while reducing the requirement to defoaming water quality.

Description

Technical Field

[0001] This utility model relates to a sewage treatment equipment, specifically, a defoaming device for a sewage treatment biochemical tank. Background Technology

[0002] In the field of wastewater treatment, biological treatment technology is widely used due to its stability, effectiveness, and low cost. However, the biological treatment process generates a large amount of foam. This foam is viscous, which hinders oxygen entry, reduces oxygenation efficiency, and carries away solids such as activated sludge, increasing the suspended solids content of the effluent and causing water quality deterioration. Simultaneously, it forms a large amount of scum on the surface of the secondary sedimentation tank. The foam, carried by the wind, causes environmental hygiene problems, and its spread to the walkways can affect inspections and equipment maintenance. Therefore, it is necessary to defoam the surface of the biological treatment tank when using biological treatment technology. The most common method is the hydraulic spray defoaming device, which is widely used due to its ease of operation. Traditional hydraulic spray defoaming devices typically consist of a water pump, pipes, a support frame, and nozzles. The nozzles are installed above the biological treatment tank in the wastewater treatment system via the support frame and connected to the outlet of the water pump via pipes. A water pump draws water in, spraying it from nozzles into the biological treatment tanks. The height difference between the nozzles and the water surface, along with the droplet droplet's impact, causes the water droplets to impact the biological foam in each tank, removing a large amount of floating foam. While this type of defoaming device uses various nozzle designs, they are all prone to clogging. Therefore, they often use the supernatant from sedimentation tanks as the water source, resulting in long pipelines and high energy consumption. Summary of the Invention

[0003] Therefore, the technical problem to be solved by this utility model is to provide a defoaming device for a biological treatment tank in sewage treatment, which improves the anti-clogging performance and defoaming efficiency through optimization of the defoaming device, while reducing the requirements for the quality of the water used for defoaming.

[0004] To achieve the aforementioned novel objective, the technical solution adopted in this utility model embodiment is: a defoaming device for a wastewater treatment biochemical tank, comprising: The water inlet device includes a defoaming pump, an inlet pipe, an outlet pipe, and a filter screen; the defoaming pump is connected to the inlet pipe and the outlet pipe respectively, and the filter screen is located at the inlet end of the inlet pipe; The water distribution pipeline system includes a main water distribution pipe, branch water distribution pipes, diversion branch pipes, and defoaming spray pipes; the main water distribution pipe is connected to the outlet pipe; the branch water distribution pipes are connected to the main water distribution pipes, and the branch water distribution pipes are ring pipes, which are arranged above the edge of the sewage treatment biological treatment tank; the diversion branch pipes are connected to the branch water distribution pipes; the defoaming spray pipes are connected to the branch water distribution pipes and are at an angle of 30-50 degrees to the horizontal plane; The defoaming spray nozzle includes a reducing tee, a De50 pipe clamp, a 45° De50 elbow, a De50 ball valve, a De50 / 32 reducing straight connector, a De32 union, a De32 plug, several De50 PVC pipes, and several De32 PVC pipes. The reducing tee and the De50 pipe clamp, the De50 pipe clamp and the 45° De50 elbow, the 45° De50 elbow and the De50 ball valve, and the De50 ball valve and the De50 / 32 reducing straight connector are all connected via the De50 PVC pipes. The De50 / 32 reducing straight connector and the De32 union, and the De32 union and the De32 plug are all connected via the De32 PVC pipes. Furthermore, each De32 PVC pipe has a vertically axially oriented "I"-shaped nozzle at a distance of 20-30 cm from the plug, and the width of the "I"-shaped nozzle is 2-4 mm.

[0005] Furthermore, the quantitative relationship of the water distribution pipeline system is as follows: one outlet pipe connects to multiple main water distribution pipes, one main water distribution pipe connects to two branch water distribution pipes, one branch water distribution pipe connects to multiple defoaming spray pipes, and the spray surfaces of adjacent defoaming spray pipes are interconnected to cover the entire surface of the sewage treatment biological tank.

[0006] Furthermore, water flow regulating valves are installed on the main water distribution pipe, branch water distribution pipe, and defoaming spray pipe.

[0007] Furthermore, the central angle corresponding to the "I"-shaped nozzle is 85-95 degrees.

[0008] Furthermore, it also includes a secondary nozzle, which is also a straight nozzle with a corresponding central angle of 40-45 degrees; and the angle between the spray direction of the secondary nozzle and the spray direction of the straight nozzle is 30-35 degrees, forming a cross spray.

[0009] Furthermore, the secondary nozzle is controlled to open and close via a miniature solenoid valve.

[0010] Furthermore, the filter screen is a stainless steel filter screen.

[0011] The advantages of this utility model are: 1. A stainless steel filter screen is installed at the water intake to intercept damaged packing and other debris from being sucked in, effectively preventing blockage of the defoaming pump and pipeline; 2. Setting up a ring-shaped water distribution branch pipe is beneficial for relatively balanced water flow in each nozzle. During maintenance, some pipe sections can be blocked while other pipe sections continue to operate normally, making it more flexible and convenient. 3. Valves are installed on the main pipe, branch pipes and spray pipes to flexibly adjust the defoaming water volume and accurately defoam; 4. The nozzle is designed in a straight strip shape with a large notch span, making it less prone to clogging and easier to process, effectively avoiding the crystallization and clogging problem of traditional nozzles; 5. Add a secondary nozzle, making the "I"-shaped nozzle the main nozzle for regular defoaming. The spray direction is perpendicular to the water surface (or slightly inclined), forming a large-area fan-shaped water curtain. The secondary nozzle opens in high-viscosity foam scenarios, forming an angle of about 30° with the main nozzle. Its spray direction intersects with the main nozzle's water flow, enhancing the breaking effect on viscous foam through the "three-dimensional cross impact" of the two water flows (similar to "scissor-like" cutting), thus improving impact efficiency. 6. The nozzle is equipped with a flexible joint, which makes it easy to disassemble and replace, effectively solving the problem of equipment replacement; 7. By optimizing the above-mentioned anti-clogging performance of the defoaming device, the mixed liquid from the biochemical tank can be used as the defoaming water source nearby. The pipeline is short, the energy consumption is low, and it does not interfere with the sedimentation zone. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the overall structure of the defoaming device for the biochemical tank in wastewater treatment according to this utility model.

[0014] Figure 2 This is a plan view of the distribution of the defoaming device of the wastewater treatment biochemical tank in the aerobic tank.

[0015] Figure 3 yes Figure 2 Cross-sectional view along AA.

[0016] Figure 4 This is a schematic diagram of the structure of the defoaming spray nozzle of this utility model.

[0017] Figure 5 yes Figure 4 A cross-sectional view along BB.

[0018] Figure 6 yes Figure 4 A cross-sectional view along CC.

[0019] Figure 7 This is a schematic diagram illustrating the jet principle of two nozzles.

[0020] The technical features in the diagram are marked as follows: 1. Water inlet device; 11. Defoaming pump; 12. Water inlet pipe; 13. Water outlet pipe; 14. Filter screen; 2. Water distribution piping system; 21. Main water distribution pipe; 22. Branch water distribution pipe; 23. Diversion branch pipe; 24. Defoaming spray pipe; 241. Reducing tee; 242. De50 pipe clamp; 243. 45° De50 elbow; 244. De50 ball valve; 245. De50 / 32 reducing straight joint; 246. De32 union; 247. De32 plug; 248. De50 PVC pipe; 249. De32 PVC pipe; 251. "I"-shaped strip nozzle; 252. Secondary nozzle; 26. Pipe clamp; 200. Wastewater treatment biological treatment tank. Detailed Implementation

[0021] In existing technologies, the foam generated by biochemical treatment reduces oxygenation efficiency and deteriorates effluent quality. Traditional hydraulic defoaming devices use sedimentation tank supernatant as a water source, which suffers from drawbacks such as long pipelines and high energy consumption. The nozzle structure is complex and prone to clogging, requiring frequent maintenance and affecting the stability of system operation.

[0022] To address the aforementioned problems, the technical solution in this utility model embodiment is as follows: Addressing the issues of easy clogging, low defoaming efficiency, high energy consumption, and stringent water quality requirements of traditional hydraulic spray defoaming devices, the device performance is improved through multi-dimensional optimization design. Specifically, this includes: setting up an inlet filter structure to intercept debris and enhance anti-clogging performance; employing annular water distribution branches and multi-pipe valve adjustment to achieve balanced and precise water flow control; designing a straight strip-shaped main nozzle and adding cross-shaped secondary nozzles to improve defoaming efficiency (especially for high-viscosity foam); optimizing the spray pipe structure for easy disassembly and maintenance; and ultimately achieving the use of a nearby biological treatment tank mixture as a water source, shortening pipelines and reducing energy consumption, while simultaneously improving anti-clogging performance and defoaming effect through structural optimization.

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] Please see Figures 1 to 7 As shown, the present invention provides a defoaming device for a wastewater treatment biochemical tank, comprising: The water inlet device 1 includes a defoaming pump 11, an inlet pipe 12, an outlet pipe 13, and a filter screen 14. The defoaming pump 11 is connected to the inlet pipe 12 and the outlet pipe 13 respectively. The inlet pipe 12 is used to connect to the biological treatment tank, and the mixture of the biological treatment tank and the defoaming agent is used as the defoaming water. The filter screen 14 is located at the inlet end of the inlet pipe 12. The filter screen 14 refers to the interception device set at the inlet end, which can be implemented by using a stainless steel woven mesh with a mesh size smaller than the clearance of the water pump impeller, and is used to intercept fibrous impurities.

[0025] The water distribution pipeline system 2 includes a main water distribution pipe 21, branch water distribution pipes 22, diversion branch pipes 23, and defoaming spray pipes 24. The main water distribution pipe 21 is connected to the outlet pipe 13. The branch water distribution pipes 22 are connected to the main water distribution pipe 21 and can be fixed by pipe clamps 26. The branch water distribution pipes 22 are ring pipes and are arranged above the edge of the sewage treatment biological tank. The diversion branch pipes 23 are connected to the branch water distribution pipes 22 and are used to discharge excess mixed liquid. The defoaming spray pipes 24 are connected to the branch water distribution pipes 22 and are at an angle of 30-50 degrees to the horizontal plane, which allows the water flow to impact the tank surface in an inclined direction, forming a large-area fan-shaped water curtain, enhancing the shearing effect and impact efficiency of the water flow on the foam layer. This angled design ensures that the spray surfaces of adjacent nozzles are interconnected, covering the entire surface of the wastewater treatment biological tank and avoiding defoaming blind spots. Simultaneously, the inclined spray more effectively breaks down the viscous structure of foam, improving the breaking effect on viscous foam. Combined with the sheet-like water flow formed by the "I"-shaped nozzles, this further enhances defoaming efficiency. The water distribution branch pipe 22 refers to the annular water supply pipe surrounding the edge of the tank. It can be constructed from PVC material in sections, ensuring balanced pressure at the inlet of each nozzle.

[0026] The defoaming spray pipe 24 includes a reducing tee 241, a De50 pipe clamp 242, a 45° De50 elbow 243, a De50 ball valve 244, a De50 / 32 reducing straight pipe 245, a De32 union 246, a De32 plug 247, several De50 PVC pipes 248, and several De32 PVC pipes 249; the reducing tee 241 and the De50 pipe clamp 242, the De50 pipe clamp 242 and the 45° De50 elbow 243, and the 45° De50 elbow 243 and the De50 / 32 ball valve 249 are connected; The De50 ball valve 244 and the De50 / 32 reducing valve 245 are connected by the De50 PVC pipe 248; the De50 / 32 reducing valve 245 and the De32 union 246, and the De32 union 246 and the De32 plug 247 are connected by the De32 PVC pipe 249; and the De32 PVC pipe 249 has a straight strip-shaped nozzle 251 perpendicular to the axial direction at a distance of 20-30cm from the plug, the width of the straight strip-shaped nozzle 251 being 2-4mm. Figure 5 and Figure 6 As shown, the "I"-shaped nozzle refers to a narrow opening opened radially along the pipe. It can be processed using laser cutting technology, with the length of the opening forming an angle with the direction of water flow, so that the water flow spreads out in a fan shape.

[0027] Specifically, the defoaming pump 11 draws the treated effluent, which is then filtered through a filter screen and enters the main water distribution pipe 21. The water flow is distributed to multiple defoaming spray nozzles 24 through the annular water distribution branch pipe 22. After being diverted by a reducing tee 241, the flow direction is changed by an elbow. Ball valves adjust the flow rate of each spray nozzle. The water flow is accelerated after the pipe diameter is directly reduced by the reducing tee, and finally sprayed out in a sheet-like shape from the strip nozzles. The nozzle angle causes the water flow to impact the pool surface in an inclined direction, and the spray areas of adjacent spray nozzles overlap to form a continuous coverage.

[0028] Compared to existing technologies, traditional devices using multi-hole nozzles are prone to clogging by activated sludge particles, while linear strip nozzles lack internal cavity structures, making it difficult for impurities to accumulate. Existing technologies require long-distance pipeline laying to connect to the sedimentation tank. This solution directly utilizes the effluent from the biological treatment tank as the water source, and the water distribution branch pipes 22 are arranged in a ring along the tank body, shortening the pipeline length. Through the above technical solution, this application achieves continuous removal of foam from the surface of the biological treatment tank. The strip nozzle structure significantly reduces the clogging rate, the ring water distribution network shortens the water supply path and reduces energy consumption, the variable diameter structure ensures uniform flow in each nozzle, and the inclined spray angle enhances the shearing effect of the water flow on the foam layer.

[0029] This application further proposes the following quantitative relationship for the water distribution pipeline system 2: one main water distribution pipe 21 supplies only one biological treatment tank 200; one outlet pipe 13 can be used to install multiple main water distribution pipes 21 to accommodate multiple sewage treatment biological treatment tanks 200; one main water distribution pipe 21 connects to two branch water distribution pipes 22, and one branch water distribution pipe 22 connects to multiple defoaming spray pipes 24. The spray surfaces of adjacent defoaming spray pipes 24 are interconnected to cover the entire surface of the sewage treatment biological treatment tank. The main water distribution pipe 21 refers to the main delivery pipe connecting to the outlet pipe 13, which can be made of PVC material and is used to evenly distribute defoaming water to each branch water distribution pipe 22. Its pipe diameter can be adjusted according to the scale of the biological treatment tank. The defoaming spray pipes 24 are connected to the branch water distribution pipes 22 to achieve spatial distribution of defoaming water. The defoaming spray pipe 24 refers to a spray unit with a strip-shaped nozzle at the end, used to form a spray water flow at a specific angle. Interconnected spray surfaces refer to the fact that the spraying ranges of adjacent defoaming nozzles 24 partially overlap on the horizontal plane. This can be achieved by adjusting the nozzle spacing and spray angle, thereby eliminating blind spots in coverage.

[0030] The main water distribution pipe 21, branch water distribution pipe 22, and defoaming spray pipe 24 are all equipped with water volume regulating valves, which can flexibly adjust the defoaming water volume and accurately defoam.

[0031] Furthermore, the central angle corresponding to the "I"-shaped nozzle 251 is 85-95 degrees, with 90 degrees being preferred. The central angle refers to the angle range corresponding to the nozzle opening in the circumferential direction of the pipe. Specifically, it can be achieved by adjusting the mold forming angle or cutting trajectory. This angle range can control the coverage area of ​​the water flow diffusion. By limiting the range of the central angle, the water flow diffusion pattern is precisely controlled, and the spray surfaces of adjacent nozzles can be seamlessly connected, covering the entire pool surface without increasing the number of nozzles.

[0032] It also includes a secondary nozzle 252, which is also a straight nozzle with a central angle of 40-45 degrees. The spray direction of the secondary nozzle 252 forms a 30-35 degree angle with the spray direction of the straight nozzle 251, creating a cross-spray. The straight nozzle 251 serves as the main nozzle, while the secondary nozzle 252 refers to the auxiliary spray structure installed on the defoaming nozzle pipe 24. It can be implemented using the same processing method as the main nozzle, and its smaller central angle design can create a concentrated water flow to enhance local impact. The cross-spray refers to the composite water flow coverage pattern formed by the main and secondary nozzles 252 arranged at a specific angle, which can be achieved by adjusting the pipe connection angle. This design allows the two water flows to form complementary coverage areas in space. The secondary nozzle 252 generates a dense water jet with a small diffusion angle of 40-45 degrees, and its spray direction forms a 30-35 degree angle with the main nozzle. When the two water streams operate simultaneously, the wide coverage of the main nozzle and the directional impact of the secondary nozzle 252 form an interwoven water network on the pool surface. While the main stream handles large-area defoaming, the secondary stream penetrates stubborn foam layers not completely eliminated by the main stream. This dual-mode synergy ensures overall coverage efficiency while targeting high-viscosity foam areas. The cross-spray structure, through the synergistic effect of two independent nozzles, expands the coverage of single-point spraying without increasing pipeline complexity, and enhances the impact intensity in key areas through the superposition effect of water flow. Compared to simply increasing nozzle size or the number of nozzles, this design improves defoaming efficiency while avoiding the risk of pipeline blockage.

[0033] The secondary nozzle 252 is controlled to open and close by a miniature solenoid valve 253. The miniature solenoid valve 253 is a valve that controls the flow of fluid by electromagnetic force. Specifically, a normally closed solenoid valve can be used. It has a fast response speed and good sealing performance. It is used to dynamically adjust the opening and closing state of the secondary nozzle 252 according to the amount of foam. When there is a lot of high-viscosity foam, it is controlled to open to avoid energy consumption caused by continuous opening.

[0034] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A defoaming device for a wastewater treatment biological treatment tank, characterized in that: include: The water inlet device includes a defoaming pump, an inlet pipe, an outlet pipe, and a filter screen; the defoaming pump is connected to the inlet pipe and the outlet pipe respectively, and the filter screen is located at the inlet end of the inlet pipe; The water distribution pipeline system includes a main water distribution pipe, branch water distribution pipes, diversion branch pipes, and defoaming spray pipes; the main water distribution pipe is connected to the outlet pipe; the branch water distribution pipes are connected to the main water distribution pipes, and the branch water distribution pipes are ring pipes, which are arranged above the edge of the sewage treatment biological treatment tank; the diversion branch pipes are connected to the branch water distribution pipes; the defoaming spray pipes are connected to the branch water distribution pipes and are at an angle of 30-50 degrees to the horizontal plane; The defoaming spray nozzle includes a reducing tee, a De50 pipe clamp, a 45° De50 elbow, a De50 ball valve, a De50 / 32 reducing straight connector, a De32 union, a De32 plug, several De50 PVC pipes, and several De32 PVC pipes. The reducing tee and the De50 pipe clamp, the De50 pipe clamp and the 45° De50 elbow, the 45° De50 elbow and the De50 ball valve, and the De50 ball valve and the De50 / 32 reducing straight connector are all connected via the De50 PVC pipes. The De50 / 32 reducing straight connector and the De32 union, and the De32 union and the De32 plug are all connected via the De32 PVC pipes. Furthermore, each De32 PVC pipe has a vertically axially oriented "I"-shaped nozzle at a distance of 20-30 cm from the plug, and the width of the "I"-shaped nozzle is 2-4 mm.

2. The defoaming device for a wastewater treatment biological treatment tank as described in claim 1, characterized in that: The quantitative relationship of the water distribution pipeline system is as follows: one outlet pipe connects to multiple main water distribution pipes, one main water distribution pipe connects to two branch water distribution pipes; one branch water distribution pipe connects to multiple defoaming spray pipes, and the spray surfaces of adjacent defoaming spray pipes are interconnected to cover the entire surface of the sewage treatment biological treatment tank.

3. The defoaming device for a wastewater treatment biological tank as described in claim 1, characterized in that: Water volume regulating valves are installed on the main water distribution pipe, branch water distribution pipe, and defoaming spray pipe.

4. The defoaming device for a wastewater treatment biological treatment tank as described in claim 1, characterized in that: The central angle corresponding to the "I"-shaped nozzle is 85-95 degrees.

5. The defoaming device for a wastewater treatment biological treatment tank as described in claim 4, characterized in that: It also includes a secondary nozzle, which is also a straight nozzle with a corresponding central angle of 40-45 degrees; and the angle between the spray direction of the secondary nozzle and the spray direction of the straight nozzle is 30-35 degrees, forming a cross spray.

6. The defoaming device for a wastewater treatment biological treatment tank as described in claim 5, characterized in that: The secondary nozzle is controlled to open and close via a miniature solenoid valve.

7. The defoaming device for a wastewater treatment biological treatment tank as described in claim 1, characterized in that: The filter screen is a stainless steel filter screen.

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