Passive defoaming device, sewage treatment plant tail end foam treatment system and control method

Abstract

The application relates to the technical field of wastewater treatment, in particular to a passive defoaming device, a sewage treatment plant tail end foam treatment system and a control method. The passive defoaming device, the active defoaming device, the chemical defoaming device and the control subsystem are arranged to realize the synergistic effect of passive defoaming, active defoaming and chemical defoaming, realize comprehensive defoaming, realize intelligent control of defoaming through the control subsystem, and realize efficient and low-consumption control of foam.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a passive defoaming device, a foam treatment system at the tail end of a wastewater treatment plant, and a control method. Background Technology

[0002] After being treated within the wastewater treatment plant, a major destination for urban wastewater is its discharge into rivers, lakes, and other water bodies for landscaping and environmental use. Even though the impurities in the water at this point meet treatment requirements, factors such as the presence of foaming substances or significant water flow can cause stable and continuous floating and accumulating foam near the discharge outlet. The obvious visibility of large amounts of floating foam easily raises public alarm and negatively impacts the stable operation of wastewater treatment plants. This includes increased labor intensity for manual defoaming; increased operating costs due to increased defoamer dosage within the plant; and water quality deterioration caused by excessive defoamer addition. Therefore, foam control at the effluent outlet of such wastewater treatment plants is particularly important.

[0003] Existing technologies primarily address foam control within wastewater treatment plant areas (biological tank areas). This type of foam can be broadly categorized into chemical foam and biological foam. Chemical foam is caused by foaming substances in wastewater (such as surfactants, certain suspended solids, etc.) under aeration or stirring conditions. Biological foam, on the other hand, is a stable three-phase system formed by air, water, and microorganisms. It is mainly caused by the large-scale proliferation of filamentous bacteria. Filamentous bacteria are often filamentous or branched, easily capturing suspended particles and air bubbles to float to the water surface, forming relatively stable biological foam.

[0004] The literature reports several methods for foam control in wastewater treatment plants, including: (1) Spraying water or pumping activated sludge back onto the foam surface. This method breaks up the bubbles on the surface of the liquid with water pressure. However, due to the high viscosity of activated sludge, the foam is not easy to break, and the spraying process may cause secondary foam problems. (2) Reducing the aeration rate to reduce foam generation. However, this method will reduce the dissolved oxygen content in the aeration tank, thus affecting the water quality after wastewater treatment. (3) Installing a foam breaker. This method involves installing a foam breaker at the bubbling point of the aeration tank. The equipment includes a fan-shaped impeller, a motor, and a frequency converter. However, the effect of this type of equipment is unstable, and it consumes a lot of electricity and has high operating costs. (4) Adding defoamer. Defoamer can quickly control the accumulation of foam, but it can only slow down the growth of foam and cannot completely eliminate the formation of foam. Therefore, repeated spraying is required, resulting in high defoaming costs. In addition, excessive use of defoamer may affect the activity of microorganisms in the biological treatment tank and remain in the water, which may cause secondary pollution.

[0005] In summary, existing foam control methods are all based on research on foam problems within wastewater treatment plant areas (biological tank areas), and are not suitable for foam control at the tail end of drainage. Furthermore, these methods themselves have many drawbacks.

[0006] Although existing research has not specifically addressed foam at the effluent tail end of wastewater treatment plants, some foam control systems or methods still offer valuable insights. Patent application number 201510141310.X (1) provides a device for addressing the problem of excessive foam accumulation in aerobic biological processes. The device includes a booster electric agitator and a set of stirring paddles. The stirring paddles are controlled by adjusting the speed of the booster electric agitator, and foam is broken through physical stirring. Patent application number 202110940606.3 (2) designs an artificial intelligence control system and method for controlling foam in coal gasification industrial wastewater. This patent reduces the foam volume in the biological treatment system by monitoring and controlling the influent COD concentration, sludge concentration, and dissolved oxygen concentration in the aerobic tank. Simultaneously, it improves the removal of COD and nitrogen / phosphorus during the biological treatment process. The added water spray system also contributes to foam reduction through hydraulic impact. Utility model patent (3) with application number 202320305568.9 provides a foam removal system for an aeration tank, including an aeration tank, a filter box, a foam scraper that can float on the water surface, a breaker, and a water pump. A propeller and multiple high-pressure nozzles are located above the aeration tank. The lower side of the propeller is fixedly connected to the foam scraper and can drive the foam scraper to move on the water surface. A connecting pipe is connected to the middle of the lower side of the foam scraper, and the free end of the connecting pipe is connected to the upper end of the breaker to allow the scraped foam to be fed into the breaker. The lower end of the breaker is connected to the upper end of the filter box. One end of the water pump is connected to the filter box, and the other end is connected to the high-pressure nozzles. This system also utilizes physical action to control foam.

[0007] However, the existing patents mentioned above also have problems such as system complexity, low defoaming efficiency, and high operating costs. Taking patent (2) as an example, the system needs to start from the biological pool treatment end, and the system has too many monitoring and control elements and is complicated to operate; taking hydraulic impact defoaming as an example, this process is difficult to completely eliminate foam and is prone to causing secondary foam; taking the foam breaking device as an example, it consumes a lot of electricity and has high operating costs during the recycling process. Summary of the Invention

[0008] To address the above technical issues, this application provides a passive defoaming device, a wastewater treatment plant tail-end foam treatment system, and a control method, which control the foam at the tail end of the wastewater treatment plant effluent through a combination of physical defoaming and intelligent chemical defoaming.

[0009] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0010] In a first aspect, a passive defoaming device is provided for eliminating foam in water. The device includes a first defoaming device disposed at a water outlet, wherein there is a potential difference between the first defoaming device and the water outlet, and the first defoaming device is provided with a foam-breaking mesh surface, which is arranged facing the water outlet. The device also includes a second defoaming device disposed downstream of the first defoaming device, wherein the second defoaming device includes multiple floats, and the multiple floats are connected in series by a connecting rod to form an interception space.

[0011] Furthermore, the first defoaming device also includes a support grid connected to the defoaming mesh surface. The support grid is connected to the side of the defoaming mesh surface away from the outlet, and a non-linear channel is provided in the support grid to communicate with the defoaming mesh surface.

[0012] Furthermore, the bubble-breaking mesh surface is composed of a plurality of corrugated bubble-breaking filaments arranged in a first direction and a second direction, wherein the first direction and the second direction are non-parallel directions.

[0013] Furthermore, the interception space is V-shaped.

[0014] Secondly, a wastewater treatment plant tail-end foam treatment system is provided for eliminating foam in the wastewater discharge from the wastewater treatment plant. The wastewater treatment plant is equipped with a tail-end pool for holding the wastewater, including a passive defoaming device based on any of the above-mentioned methods. The first defoaming device is located at the outlet of the tail-end pool. The system also includes a control subsystem and an active defoaming device and a chemical defoaming device electrically connected to the control subsystem. The active defoaming device is located within the interception space and outputs pressurized water flow. The chemical defoaming device is located at the tail-end pool and is used to inject defoaming agent into the tail-end pool. The control subsystem is used to control the opening and closing of the active defoaming device and the chemical defoaming device.

[0015] Furthermore, the control subsystem includes an image acquisition device positioned facing the interception space, and a server electrically connected to the image acquisition device. The image acquisition device is used to acquire regional images of the interception space and upload them to the server. The server identifies foam in the regional images and determines the proportion of foam in the interception space, and controls the opening and closing of the active defoaming device and / or the chemical defoaming device based on the foam proportion.

[0016] Furthermore, the active defoaming device includes a water pump and a water pipe connected to it, with multiple nozzles arranged on the water pipe, the multiple nozzles facing the interception space.

[0017] Thirdly, a method for controlling foam treatment at the tail end of a wastewater treatment plant is provided, applied to the control subsystem described in any one of the above-mentioned methods. The method includes: acquiring an image of the region according to an image acquisition time interval; segmenting the region image to determine the proportion of foam within the interception space; controlling the active defoaming device to activate within a preset time period when the foam proportion exceeds a preset foam proportion threshold; collecting the number of times the active defoaming device is activated within a control cycle; and controlling the activation of the chemical defoaming device based on a chemical defoaming control strategy when the number of activations exceeds a preset threshold.

[0018] Furthermore, the step of performing region segmentation on the region image to determine the proportion of foam within the interception space includes: performing grayscale processing on the region image to obtain a grayscale image, performing threshold segmentation on the grayscale image to separate the foam region from other regions, calculating the number of image pixels in the foam region, and determining the area proportion of the foam within the interception space based on the number of image pixels, wherein the area proportion is the proportion of foam.

[0019] Furthermore, the method of controlling the activation of the chemical defoaming device based on the chemical defoaming control strategy includes: obtaining the drainable volume of the tail end water tank and controlling the activation of the chemical defoaming device based on a preset defoamer injection ratio.

[0020] Fourthly, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the wastewater treatment plant tail-end foam treatment control method described in any of the preceding claims.

[0021] Fifthly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the wastewater treatment plant tail-end foam treatment control method described in any of the preceding claims.

[0022] In the technical solution provided in this application embodiment, passive defoaming device, active defoaming device, chemical defoaming device and control subsystem are set up to achieve comprehensive defoaming through the synergistic effect of passive defoaming, active defoaming and chemical defoaming, and intelligent defoaming control is achieved through control subsystem, so as to achieve efficient and low consumption control of foam. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] The methods, systems, and / or procedures shown in the accompanying drawings will be further described with reference to exemplary embodiments. These exemplary embodiments will be described in detail with reference to the drawings. These exemplary embodiments are non-limiting exemplary embodiments, wherein example figures represent similar mechanisms in the various views of the drawings.

[0025] Figure 1 This is a schematic diagram of the layout of the wastewater treatment plant tail-end foam treatment system provided in the embodiments of this application;

[0026] Figure 2 This is a schematic diagram of the structure of the first defoaming device provided in the embodiments of this application;

[0027] Figure 3 This is a first schematic diagram of the structure of the second defoaming device provided in the embodiments of this application;

[0028] Figure 4 This is a second schematic diagram of the structure of the second defoaming device provided in the embodiments of this application;

[0029] Figure 5 This is a schematic diagram of the active defoaming device provided in the embodiments of this application;

[0030] Figure 6 This is a schematic diagram of the process for controlling foam treatment at the tail end of a wastewater treatment plant, provided in an embodiment of this application.

[0031] Figure 7 This is a schematic diagram of the structure of the wastewater treatment plant tail-end foam treatment control device provided in the embodiments of this application;

[0032] Figure 8 This is a schematic diagram of the electronic device structure provided in the embodiments of this application.

[0033] Icon: 100 - Tail-end foam treatment system;

[0034] 110 - Tail end pool; 120 - Passive defoaming device; 130 - Active defoaming device; 140 - Chemical defoaming device; 150 - Control subsystem; 160 - Downpipe; 121 - First defoaming device; 122 - Second defoaming device; 131 - Image acquisition device; 132 - Water pump; 133 - Water pipe; 1211 - Defoaming mesh surface; 1212 - Foam mat; 1221 - Float; 1222 - Connecting rod; 1223 - Interception space; 1224 - Pull line; 1225 - Bottom anchor. Detailed Implementation

[0035] To better understand the above technical solutions, the technical solutions of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0036] In the detailed description below, numerous specific details are illustrated with examples to provide a comprehensive understanding of the relevant guidance. However, it will be apparent to those skilled in the art that this application can be practiced without these details. In other instances, well-known methods, procedures, systems, components, and / or circuits have been described at a relatively high level without detail to avoid unnecessarily obscuring aspects of this application.

[0037] This application uses flowcharts to illustrate the execution process performed by a system according to embodiments of this application. It should be clearly understood that the execution processes in the flowcharts may not be executed sequentially. Instead, these execution processes may be executed in reverse order or simultaneously. Additionally, at least one other execution process may be added to the flowchart. One or more execution processes may be deleted from the flowchart.

[0038] Before providing a further detailed description of the embodiments of the present invention, the nouns and terms involved in the embodiments of the present invention will be explained, and the nouns and terms involved in the embodiments of the present invention shall be interpreted as follows.

[0039] (1) In response to, used to indicate the conditions or states on which the operation is performed depends. When the conditions or states on which the operation is performed are met, one or more operations may be performed in real time or with a set delay. Unless otherwise specified, there is no restriction on the order in which the multiple operations are performed.

[0040] (2) Based on, used to indicate the conditions or states on which the operation is performed depends. When the conditions or states on which it depends are met, one or more operations can be performed in real time or with a set delay. Unless otherwise specified, there is no restriction on the order of execution of the multiple operations.

[0041] After being treated within the wastewater treatment plant, a major destination for urban wastewater is its discharge into rivers, lakes, and other water bodies for landscaping and environmental use. Even though the impurities in the water at this point meet treatment requirements, factors such as the presence of foaming substances or significant water flow can cause stable and continuous floating and accumulating foam near the discharge outlet. The obvious visibility of large amounts of floating foam easily raises public alarm and negatively impacts the stable operation of wastewater treatment plants. This includes increased labor intensity for manual defoaming; increased operating costs due to increased defoamer dosage within the plant; and water quality deterioration caused by excessive defoamer addition. Therefore, foam control at the effluent outlet of such wastewater treatment plants is particularly important.

[0042] This application provides a foam treatment system and a foam treatment control method at the tail end of a wastewater treatment plant, which eliminates foam in urban wastewater through a combination of physical and chemical methods.

[0043] The wastewater treatment plant tail-end foam treatment system in this embodiment includes a passive defoaming device, an active defoaming device, a chemical defoaming device, and a control subsystem. The passive and active defoaming devices eliminate foam in the discharged wastewater using physical defoaming methods. The passive defoaming device is a non-control device, meaning it does not require control to eliminate foam. The active defoaming device, however, requires electrical connection to the control subsystem and operates based on specific control logic and physical defoaming under specific scenarios. The chemical defoaming device differs from both passive and active defoaming devices in that it is a non-physical defoaming method, eliminating foam in the water through chemical treatment. However, like the active defoaming device, the chemical defoaming device's activation and deactivation require the control subsystem to operate based on specific control logic and specific scenarios.

[0044] In summary, the wastewater treatment plant tail-end foam treatment system in this application embodiment achieves the elimination of foam in wastewater by combining physical defoaming with chemical defoaming, and active defoaming with passive defoaming.

[0045] For details on the system's specific structure and layout, please refer to [link / reference]. Figure 1 , Figure 1A schematic diagram of the layout of a wastewater treatment plant's tail-end foam treatment system is disclosed. In this embodiment, the wastewater treatment plant includes a tail-end water tank for holding wastewater. The tail-end water tank discharges wastewater into a river or other water body receiving area via a drain pipe. In this embodiment, the receiving area for the wastewater is a river. Physical defoaming devices (passive and active defoaming devices) are located within the river. A chemical defoaming device is used to chemically defoam the wastewater and is specifically located within the tail-end water tank area to chemically defoam the wastewater in the tank.

[0046] The passive defoaming device in this application embodiment includes a first defoaming device and a second defoaming device. Both the first and second defoaming devices are installed in the river channel, and the second defoaming device is installed downstream of the first defoaming device. The tail end of the drainage is first passively defoamed by the first defoaming device and then passively defoamed by the second defoaming device.

[0047] Specifically, the first defoaming device is placed in the river channel at the outlet of the tail-end pool. Since the water from the tail-end pool is discharged via a downpipe, in this embodiment, the first defoaming device is positioned at the outlet of the downpipe, and there is a potential difference between the first defoaming device and the downpipe, which is a gravitational potential difference. Furthermore, the first defoaming device and the downpipe are aligned perpendicularly, meaning the water from the downpipe contacts the first defoaming device at a vertical angle.

[0048] See Figure 2 The first defoaming device includes a defoaming mesh surface that directly contacts the water outlet in the downpipe and a defoaming mesh pad connected to the defoaming mesh surface. The defoaming mesh surface is reinforced by a supporting grid and positioned at the water surface. The defoaming mesh pad has a certain thickness, with part of it floating above the water surface and part submerged. The water flowing down from the downpipe directly impacts the floating defoaming mesh surface, absorbing the energy of the water flow and acting as a buffer, thus reducing the intensity of ripples and splashes, effectively weakening foam and water droplet formation. After the water flows into the river channel, bubbles will still be generated, forming floating foam. However, the submerged defoaming mesh pad in the first defoaming device has channels that allow the foam to pass through, eliminating it and causing the foam size to decrease as it rises until it becomes difficult to form effective foam.

[0049] Furthermore, to increase the effectiveness of foam cutting within the defoaming mesh, the channels within the mesh are non-linear, featuring multiple angled bends that cut the foam at these bends. These channels can be corrugated with multiple acute angles to enhance cutting and defoaming capabilities.

[0050] In this embodiment, the shape of the first defoaming device can be set according to the water outlet shape of the water outlet pipe. That is, if the cross-section of the water outlet pipe is circular, the water outlet shape is also circular. Therefore, the shape of the first defoaming device, especially the shape of the defoaming mesh surface, is also circular, and the area of ​​the defoaming mesh surface is at least the same as the cross-sectional area of ​​the water outlet pipe. When the water drop area is small and approximately circular, a circular device is preferred; when the water drop area is large and non-circular, a rectangular wire device is preferred. The selection requirement is that the water completely falls on the wire mesh defoamer and covers a certain area around it.

[0051] To ensure the stability of the bubble-breaking mesh surface, a support grid can be installed in this embodiment to increase its stability. The support grid is a supporting structure that maintains the shape and stability of the bubble-breaking mesh surface and the bubble-breaking mesh pad. Pull wires are fixed to the sides or four corners of the support grid; these wires are used to fix the wire mesh bubble-breaking device at a suitable position on the water surface.

[0052] Figure 3 A structural schematic diagram of the second defoaming device is provided, wherein the second defoaming device is located in the river and downstream of the first defoaming device.

[0053] The second defoaming device consists of multiple floats connected in series by a connecting rod to form a V-shaped interception space. Foam that has not been eliminated by the first defoaming device flows with the river water into the interception space and accumulates.

[0054] Specifically, the floats can be floating objects with mass, such as buoys or float balls, and adjacent floats are closely arranged. The floats are the most important part of the second defoaming device, and their shapes include circular, cylindrical, and elliptical. Each float has a hole in its center, and several floats are connected together without gaps by connecting rods to form a float chain. Each float can float on the water surface, and the floats act as a barrier to contain foam within an interception space. In this embodiment, the floats are made of plastic.

[0055] See Figure 4The structure of the connecting rod shows that its function is to connect the floats in series to form a float chain and maintain the stability of the overall V-shaped structure. At the ends of the connecting rod, i.e., the three vertices of the V-shape, there are fixed guy lines with a certain telescopic length. The bottom end of the guy lines is connected to a fixed anchor or pier submerged in the water. Even if the water level changes, the floats can float under the traction of the telescopic guy lines, thus ensuring they float on the water surface to effectively block bubbles. In this embodiment, the connecting rod is made of plastic. The float chain is installed 2-5m downstream of the wire mesh bubble-breaking device, with the top opening of the V-shape as the reference point. The top vertices on one side of the V-shape are close to the bank, while the top vertices on the other side extend outwards at a distance K, which is K + (1-3) meters, depending on the distance K between the drain outlet and the riverbank.

[0056] In this embodiment, passive defoaming of foam is achieved through a first defoaming device and a second defoaming device. The second defoaming device only aggregates the foam to facilitate further defoaming. This embodiment also includes an active defoaming device, see reference [link to relevant documentation]. Figure 5 The active defoaming device includes a water pump and a water pipe connected to the water pump, wherein multiple nozzles are provided on the water pipe and the multiple nozzles are positioned facing the interception space.

[0057] The active defoaming device uses a water pump to draw river water and forms a pressurized water flow through water pipes and multiple nozzles. The water flow is sprayed into the interception space and the foam is broken and eliminated by external force, thereby achieving complete elimination of the accumulated foam.

[0058] In this embodiment, compared to a passive defoaming device, the active defoaming device operates on the principle of active defoaming control, meaning that active defoaming is only required when the foam concentration in the interception space is high. Therefore, in this embodiment, a control subsystem is provided to enable and disable the active defoaming device.

[0059] In this embodiment of the application, the control subsystem includes an image acquisition device facing the interception space and a server communicating with the image acquisition device. The image acquisition device is used to acquire regional images of the interception space and upload the regional images to the server. The server identifies the foam in the regional images and determines the proportion of foam in the interception space, and controls the opening and closing of the active defoaming device based on the proportion of foam.

[0060] The image acquisition device uses an industrial black-and-white camera. This camera captures images of specific areas and uploads them to a server. The server analyzes the grayscale information in the uploaded images to determine the proportion of foam in the area. When the foam proportion exceeds a preset threshold, the server sends an activation command to the water pump to start it and actively defoam. It's important to note that when the water pump is running, the image acquisition device no longer uploads images to the server. Upon receiving the command, the water pump draws water from the river, pressurizes it, pumps it into the pipe, and then sprays it out through multiple nozzles.

[0061] Specifically, when the water pump receives an active defoaming command from the server, it will automatically stop working after running for 20 to 60 seconds.

[0062] In the embodiments of this application, please refer to Figure 5 Regarding the structure of the water pipes and nozzles, the structure is set according to the V-shaped dimensions of the interception space, and is designed as an array of parallel water pipes from long to short according to the V-shaped gauge. Multiple nozzles are installed on the water pipes to spray the pumped water out in the form of small droplets, and the spraying area matches the area of ​​the V-shaped interception space.

[0063] In the embodiments of this application, the above structures all perform defoaming through physical defoaming methods. However, in practice, the following problem exists: physical defoaming alone cannot completely eliminate foam. To address this problem, a chemical defoaming device is used to achieve chemical defoaming. The chemical defoaming device is similar to the active defoaming device in that it also performs active defoaming; that is, the chemical defoaming device is electrically connected to the control subsystem and performs defoaming operations based on control commands issued by the control subsystem.

[0064] Among them, the chemical defoaming device includes an automatic defoamer dispenser arranged in the tail end pool area of ​​the sewage treatment plant. When the control subsystem sends a chemical defoaming command to the automatic defoamer dispenser, the automatic defoamer dispenser dispenses defoamer into the tail end pool area, and the water body with added defoamer can be defoamed in the tail end pool area.

[0065] In the embodiments of this application, silicone polyether defoamers are preferred as the type of defoamer.

[0066] See Figure 6 This application provides a control method for the defoaming operation of an active defoaming device and a chemical defoaming device in a control subsystem, for controlling the active defoaming device and the chemical defoaming device during the defoaming operation, wherein this method is configured in a server.

[0067] Specifically, this method includes the following steps:

[0068] Step S610. Acquire the region image according to the image acquisition time interval, and perform region segmentation on the region image to determine the proportion of foam in the interception space.

[0069] In this embodiment, the image acquisition device acquires images of the interception space based on a preset acquisition time to obtain a region image corresponding to the interception space. After receiving the region image, the server first performs grayscale processing on the region image to obtain a grayscale image, performs threshold segmentation on the grayscale image to separate the foam region from other regions, calculates the number of image pixels in the foam region, and determines the area ratio of the foam in the interception space based on the number of image pixels. The area ratio is the proportion of the foam.

[0070] Step S620. When the foam percentage exceeds a preset foam percentage threshold, control the active defoaming device to turn on within a preset time period.

[0071] Specifically, when the preset foam percentage threshold is 50% (i.e., when the foam area occupies 50% of the interception space), an activation command is sent to the water pump to perform active hydraulic defoaming. For details on the specific methods of active hydraulic defoaming, please refer to the instructions for the active defoaming device; further elaboration is unnecessary.

[0072] The preset time period is 20 to 60 seconds, meaning that the single working time of the active defoaming device is between 20 and 60 seconds.

[0073] Step S630. Collect the number of times the active defoaming device is turned on within the control cycle. When the number of times the device is turned on exceeds a preset threshold, control the turning on of the chemical defoaming device based on the chemical defoaming control strategy.

[0074] In this embodiment, the activation of the chemical defoaming device is based on the working result of the active defoaming device. That is, when the defoaming effect of the active defoaming device is not good, the chemical defoaming device is used to carry out defoaming operations to achieve complete foam elimination.

[0075] The defoaming effect of the active defoaming device is judged based on the number of times it is activated per unit time. When the number of times the active defoaming device is activated per unit time exceeds a preset threshold, the chemical defoaming device is activated for chemical defoaming.

[0076] Specifically, when the number of commands issued within 30 minutes reaches 10, the server sends a command to the automatic defoamer dispenser in the chemical defoaming device, and the defoamer is dispensed into the process tail end pools, such as the contact disinfection pool or clear water pool located in the sewage treatment plant area, which are close to the discharge outlet, according to the preset amount. Conversely, if the number of start commands issued to the water pump within 30 minutes is less than 10, the intelligent chemical foam control device does not need to be started, and the next 30-minute period will be recorded again.

[0077] The automatic defoamer dispensing machine incorporates a chemical defoaming control strategy. This strategy involves determining the drainable volume of the tail-end water tank during defoamer addition and controlling the activation of the chemical defoaming device based on a preset defoamer injection ratio. In this embodiment, the defoamer injection ratio is 10-200 ml per cubic meter.

[0078] See Figure 7 In this application embodiment, a wastewater treatment plant tail-end foam treatment control device 700 is also provided. This device is also applied to the server, and the device includes:

[0079] The foam proportion calculation module 710 is used to perform region segmentation on the region image to determine the foam proportion within the interception space;

[0080] The active defoaming control module 720 is used to control the active defoaming device to turn on within a preset time period when the foam ratio exceeds a preset foam ratio threshold.

[0081] The chemical defoaming control module 730 is used to collect the number of times the active defoaming device is turned on within the control cycle. When the number of times the device is turned on exceeds a preset threshold, the module controls the device to be turned on based on the chemical defoaming control strategy.

[0082] This application provides a foam control system and method for the tail end of a wastewater treatment plant, comprehensively utilizing multiple technologies to achieve efficient and low-consumption control of foam. Specifically, the system employs a wire mesh foam-breaking device to eliminate most of the foam; simultaneously, a fixed floating baffle effectively confines unbroken or re-aggregated foam within a small V-shaped area. Furthermore, the system is equipped with an intelligent hydraulic defoaming device that analyzes the degree of foam aggregation and activates the hydraulic impact defoaming function according to actual needs. When the above physical methods fail to effectively control the foam, a further instruction is sent to an intelligent chemical foam control device to inject defoamer into the tail end pool adjacent to the drainage outlet via an automatic defoamer dispenser, thereby enhancing the defoaming effect.

[0083] This integrated approach, combining physical and chemical methods, ensures both high efficiency and flexibility in foam control. The foam control system primarily utilizes low-cost physical foam control devices to meet daily foam control needs. When foam production is high, the system can accurately sense the degree of foam aggregation and, through intelligent control, automatically and intermittently activate the hydraulic impact defoaming device or add defoaming agents as needed for chemical enhancement and foam reduction. This intelligent control method not only reduces equipment energy consumption and reagent consumption but also enables the system to handle special situations such as sudden increases in foam at the effluent tail end of wastewater treatment plants. In summary, the foam control system proposed in this patent is characterized by high efficiency, low consumption, and strong scalability, providing a practical solution for foam control in wastewater treatment plants.

[0084] See Figure 8 Furthermore, the aforementioned wastewater treatment plant tail-end foam treatment control method can be integrated into the provided electronic device 800. Since the device can vary significantly due to different configurations or performance, it may include one or more processors 801 and memories 802. The memory 802 can store one or more application programs or data. The memory 802 can be temporary or permanent storage. The application programs stored in the memory 802 may include one or more modules (not shown in the figure), each module including a series of computer-executable instructions in the electronic device. Further, the processor 801 can be configured to communicate with the memory 802, and the electronic device executes the series of computer-executable instructions in the memory 802. The electronic device may also include one or more power supplies 803, one or more wired / wireless network interfaces 804, one or more input / output interfaces 805, one or more keyboards 806, etc.

[0085] In one specific embodiment, the electronic device includes a memory and one or more programs, wherein the one or more programs are stored in the memory, and the one or more programs may include one or more modules, and each module may include a series of computer-executable instructions for use in the electronic device, and is configured to be executed by one or more processors. The one or more programs include computer-executable instructions for performing the following:

[0086] The region image is acquired according to the image acquisition time interval, and the region image is segmented to determine the proportion of foam in the interception space;

[0087] When the foam percentage exceeds a preset foam percentage threshold, the active defoaming device is controlled to turn on within a preset time period.

[0088] The number of times the active defoaming device is turned on within the control cycle is collected. When the number of times the device is turned on exceeds a preset threshold, the chemical defoaming device is turned on based on a chemical defoaming control strategy.

[0089] The following is a detailed introduction to each component of the processor:

[0090] In this embodiment, the processor is an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application, such as one or more digital signal processors (DSPs), or one or more field-programmable gate arrays (FPGAs).

[0091] Optionally, the processor can perform various functions, such as the above-mentioned functions, by running or executing software programs stored in memory and by calling data stored in memory. Figure 2 The method shown.

[0092] In a specific implementation, as one example, the processor may include one or more microprocessors.

[0093] The memory is used to store the software program that executes the solution of this application, and the execution is controlled by the processor. The specific implementation method can be referred to the above method embodiment, which will not be repeated here.

[0094] Optionally, the memory can be read-only memory (ROM) or other types of static storage devices capable of storing static information and instructions, random access memory (RAM) or other types of dynamic storage devices capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. The memory can be integrated with the processor or exist independently and coupled to the processing unit through the processor's interface circuitry; this application embodiment does not specifically limit this.

[0095] It should be noted that the processor structure shown in this embodiment does not constitute a limitation on the device. The actual device may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0096] Furthermore, the technical effects of the processor can be referred to the technical effects of the methods described in the above-described method embodiments, and will not be repeated here.

[0097] It should be understood that the processor in the embodiments of this application may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0098] It should also be understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous DRAM (DDR SDRAM), enhanced synchronous DRAM (ESDRAM), synchronous linked DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0099] The above embodiments can be implemented, in whole or in part, by software, hardware (such as circuits), firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0100] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0101] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0102] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0103] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0104] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0105] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0106] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0107] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0108] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A wastewater treatment plant tail-end foam treatment system for eliminating foam in the wastewater discharge from the wastewater treatment plant, wherein the wastewater treatment plant is equipped with a tail-end pool for holding the wastewater, characterized in that, The system includes a passive defoaming device for eliminating foam in water. The passive defoaming device includes a first defoaming device located at the outlet, with a potential difference between the first defoaming device and the outlet. The first defoaming device has a foam-breaking mesh facing the outlet. It also includes a second defoaming device located downstream of the first defoaming device. The second defoaming device includes multiple floats connected in series via connecting rods to form an interception space. The first defoaming device further includes a foam-breaking mesh pad connected to the foam-breaking mesh, with the mesh pad connected to the side of the mesh away from the outlet. The mesh pad has multiple non-linear channels communicating with the mesh. The interception space is V-shaped. The non-linear channels are corrugated channels with multiple bends, cutting the foam through the bends. The first defoaming device is located at the outlet of the tail end pool. The system also includes a control subsystem and an active defoaming device and a chemical defoaming device electrically connected to the control subsystem. The active defoaming device is installed in the interception space and outputs pressurized water flow. The chemical defoaming device is installed at the tail end water tank and is used to inject defoaming agent into the tail end water tank. The control subsystem is used to control the opening and closing of the active defoaming device and the chemical defoaming device. The control subsystem includes an image acquisition device positioned facing the interception space, and a server electrically connected to the image acquisition device. The image acquisition device is used to acquire regional images of the interception space and upload them to the server.

2. The wastewater treatment plant tail-end foam treatment system according to claim 1, characterized in that, The server identifies foam in the area image and determines the proportion of foam in the interception space, and controls the opening and closing of the active defoaming device and / or the chemical defoaming device based on the foam proportion.

3. The wastewater treatment plant tail-end foam treatment system according to claim 2, characterized in that, The active defoaming device includes a water pump and a water pipe connected to the water pump. Multiple nozzles are provided on the water pipe, and the multiple nozzles are arranged facing the interception space.

4. A method for controlling foam treatment at the tail end of a wastewater treatment plant, characterized in that, The method, applied to the system of any one of claims 1-3, comprises: The region image is acquired according to the image acquisition time interval, and the region image is segmented to determine the proportion of foam in the interception space; When the foam percentage exceeds a preset foam percentage threshold, the active defoaming device is controlled to turn on within a preset time period. The number of times the active defoaming device is turned on within the control cycle is collected. When the number of times the device is turned on exceeds a preset threshold, the chemical defoaming device is turned on based on a chemical defoaming control strategy.

5. The method for controlling foam treatment at the tail end of a wastewater treatment plant according to claim 4, characterized in that, The step of segmenting the region image to determine the proportion of foam within the interception space includes: performing grayscale processing on the region image to obtain a grayscale image; performing threshold segmentation on the grayscale image to separate the foam region from other regions; calculating the number of image pixels in the foam region; and determining the area proportion of the foam within the interception space based on the number of image pixels, wherein the area proportion is the proportion of foam.

6. The method for controlling foam treatment at the tail end of a wastewater treatment plant according to claim 5, characterized in that, The method of controlling the activation of the chemical defoaming device based on the chemical defoaming control strategy includes: obtaining the drainable volume of the tail end water tank and controlling the activation of the chemical defoaming device based on a preset defoamer injection ratio.

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