Contact disinfection tank capable of automatically dredging

Abstract

The invention discloses a contact disinfection tank capable of automatically dredging, comprising: a tank body, the bottom of which is provided with a plurality of sludge discharge ports; the sludge discharge pipeline system is communicated with the sludge discharge port; the electric valve group is arranged on the sludge discharge pipeline system; the control unit is electrically connected with the electric valve group; wherein the control unit is used for controlling the alternative opening and closing of the electric valve group, so that the blockage prevention and uninterrupted sludge discharge of the sludge discharge pipeline system are realized. A plurality of sludge discharge ports are formed in the bottom of the tank body and are connected with a sludge discharge pipeline system, and the automatic dredging function of the disinfection contact tank is realized by combining alternate opening and closing control of the electric valve group. The problems that traditional manual dredging is low in efficiency and large in labor intensity are solved, and meanwhile the risk that a sludge discharging pipeline is blocked is avoided. The electric valve group is accurately controlled by the control unit, so that the system can uninterruptedly discharge sludge, and the dredging efficiency and the stability of the system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage disinfection tanks, and in particular to a contact disinfection tank capable of automatic dredging. Background Art

[0002] The contact disinfection tank is a necessary process link in the chlorine dioxide disinfection process, and provides the necessary residence time for the disinfection link. In general process design, a high-density tank or a filter cloth filter is designed at the front end of the contact disinfection tank. Because the high-density tank and the filter cloth filter cannot completely intercept and eliminate the suspended solids in the sewage of the secondary sedimentation tank, a large amount of sludge will accumulate at the bottom of the contact disinfection tank over time. The existing sewage treatment plant contact tank dredging work will bypass the incoming water and use manual dredging to dredge; some sewage treatment plants install spray flushing devices on the top of the contact disinfection tank to replace part of the manual dredging, but this cleaning method still requires the disinfection tank to be bypassed and manual auxiliary cleaning is used, and there is still a risk of excessive water quality and personnel safety accidents.

[0003] For example, patent application number CN202321706556.3 is an automatic dredging device for a contact disinfection tank, including a contact disinfection tank, a water baffle, a mud suction pipe, a mud discharge pipe, an electric valve, a control cabinet and a self-priming pump; a first through hole is provided on the surface of the mud suction pipe, one end of which is closed, and the other end is connected to the mud discharge pipe, the electric valve and the self-priming pump in sequence along the direction of mud flow; the water baffle and the mud suction pipe are arranged inside the contact disinfection tank; the electric valve, the control cabinet and the self-priming pump are arranged outside the contact disinfection tank; the control cabinet controls the opening and closing of the self-priming pump.

[0004] Although this solution uses a self-priming pump to continuously discharge the sludge in the contact disinfection pool to the sewage well through the sludge suction pipe and the sludge discharge pipe to achieve effective sludge cleaning, it cannot solve the cleaning problem mentioned above and still requires manual auxiliary cleaning, which is time-consuming and labor-intensive. Therefore, in order to achieve continuous cleaning of the sludge at the bottom of the contact disinfection pool and reduce the environmental risks during the cleaning process, it is urgent to develop a contact disinfection pool that can automatically desilt for real-time continuous water cleaning. Summary of the invention

[0005] In view of the deficiencies in the prior art mentioned in the background technology, this solution realizes the automatic dredging function of the disinfection contact pool by setting multiple mud discharge ports at the bottom of the pool body and connecting the mud discharge pipeline system, combined with the alternating opening and closing control of the electric valve group. This design solves the problems of low efficiency and high labor intensity of traditional manual dredging. Through the precise control of the electric valve group by the control unit, the system can achieve uninterrupted mud discharge and improve the dredging efficiency.

[0006] The second invention objective of the present invention is to solve the problem that clogging is prone to occur during dredging of disinfection pools.

[0007] The third invention objective of the present invention is to solve the problem that the working process of the dredging system easily causes the water in the pool to be unstable, thus affecting the dredging effect.

[0008] To achieve the above object, the present invention adopts the following technical solutions: A contact disinfection pool capable of automatic silt removal comprises: a pool body, wherein a plurality of mud discharge ports are provided at the bottom of the pool body; a mud discharge pipeline system connected to the mud discharge ports; an electric valve group arranged on the mud discharge pipeline system; and a control unit electrically connected to the electric valve group; wherein the control unit realizes anti-blocking and uninterrupted mud discharge of the mud discharge pipeline system by controlling the alternating opening and closing of the electric valve group.

[0009] Multiple sludge discharge ports are set at the bottom of the pool body, combined with the sludge discharge pipeline system to achieve efficient sludge collection. By controlling the alternating opening and closing of the electric valve group, the anti-blocking and uninterrupted sludge discharge functions of the sludge discharge pipeline system can be realized, which significantly improves the dredging efficiency, reduces the risk of pipeline blockage, and extends the service life of the system. Compared with the traditional sludge discharge method at fixed time intervals, this solution can automatically adjust the sludge discharge frequency according to actual needs, greatly reducing manpower input and energy consumption. From the perspective of fluid mechanics, the alternating opening and closing of valves forms a dynamic flow field, which reduces the deposition of sludge in the pipeline. If the dredging efficiency E is expressed as a function of the opening and closing frequency F of the electric valve, the single opening time T and the sludge concentration V: E = f(F, T, V), then this solution can maximize the dredging efficiency by optimizing these parameters.

[0010] Preferably, the mud discharge pipe system includes: a main mud discharge pipe, which is connected to the mud discharge port; a plurality of branch mud discharge pipes, which are connected to the main mud discharge pipe; wherein the electric valve groups are respectively arranged on the branch mud discharge pipes. An efficient sludge collection network is formed by the combination of the main mud discharge pipe and the plurality of branch mud discharge pipes. The tree-like structure mud discharge pipe makes the sludge collection more comprehensive and efficient. The main mud discharge pipe is connected to the mud discharge port, and as the main road for sludge transportation, it can carry a large sludge flow. A plurality of branch mud discharge pipes are dispersedly connected to the main mud discharge pipe to increase the coverage area of ​​the system and ensure that the sludge in each area of ​​the bottom of the pool body can be effectively collected. Setting the electric valve group on the branch mud discharge pipe can achieve more precise mud discharge control. This configuration enables the system to carry out targeted dredging according to the sludge deposition conditions in different areas, thereby improving the flexibility and efficiency of dredging. Compared with the traditional single pipeline system, this branch structure can significantly reduce the pressure loss of the main pipeline and improve the overall mud discharge efficiency.

[0011] Furthermore, it also includes: a mud suction device, which is arranged at the outlet end of the main mud discharge pipe; wherein the mud suction device is electrically connected to the control unit. Arranging the mud suction device at the outlet end of the main mud discharge pipe can significantly improve the mud discharge efficiency and the overall performance of the system. It can provide additional power for sludge discharge, especially when dealing with high-concentration or viscous sludge. The electrical connection between the mud suction device and the control unit enables the entire system to operate more intelligently, and the suction force can be adjusted according to the actual mud discharge needs. This configuration can not only reduce the risk of pipeline blockage, but also improve the uniformity and continuity of mud discharge. The mud suction device reduces the pressure loss in the pipeline and improves the efficiency of mud discharge, while the active mud suction method can better cope with changes in different sludge characteristics and environmental conditions.

[0012] Furthermore, it also includes: a sedimentation zone, which is arranged at the bottom of the tank body; a guide plate, which is inclined above the sedimentation zone, and the inclination angle of the guide plate is 15°-45°. The sedimentation zone is arranged at the bottom of the tank body to provide a special space for sludge deposition, which helps to improve the sludge separation efficiency. The inclined setting of the guide plate can effectively guide the water flow and promote sludge sedimentation. The selection of this angle range is obtained through experiments, which can not only ensure sufficient sedimentation effect, but also will not cause excessive hydraulic loss. The inclined guide plate can create a slowly rising water flow, so that the sludge particles have enough time to settle. Compared with the straight-wall sedimentation tank design, it can significantly improve the sedimentation efficiency and reduce the short-flow phenomenon. In addition, the presence of the guide plate can also reduce water flow disturbance and prevent the settled sludge from being rolled up again.

[0013] Furthermore, the electric valve group includes a plurality of electric valves, and a spacing section is provided between adjacent electric valves, and the length of the spacing section is 1.5-3 times the diameter of the electric valve. The spacing section provides a buffer space for sludge, reducing the risk of sludge accumulation near the valve. Appropriate spacing can reduce the water hammer effect when the valve is switched, and improve the stability of the system. In addition, this layout is also convenient for repairing and replacing a single electric valve without affecting the operation of the entire system. During backwashing, the spacing section can form a vortex to enhance the cleaning effect. Compared with the design of closely arranged valves, this spacing arrangement significantly improves the reliability and maintainability of the system, thereby solving the common blockage problem in the sludge discharge system mentioned in the second invention purpose.

[0014] Furthermore, the control unit includes a timer and a microprocessor, and the microprocessor controls the opening and closing sequence and time interval of each electric valve according to the signal of the timer. The control unit provides a time reference through the timer, and the microprocessor executes complex control logic to accurately control the opening and closing sequence and time interval of each electric valve according to the signal of the timer, so as to realize high automation and precise control of the sludge discharge process, and significantly improve the reliability and efficiency of the system. The microprocessor can dynamically adjust the opening and closing strategy of the electric valve according to the preset algorithm or real-time feedback data to adapt to different sludge characteristics and environmental conditions. This flexibility is not available in the traditional fixed time interval control method. This configuration provides a hardware basis for implementing complex control algorithms (such as fuzzy control or adaptive control). For example, dynamic adjustment based on sludge concentration can be achieved through a microprocessor, or the best time for sludge discharge can be predicted based on historical data. This intelligent control can not only optimize the sludge discharge efficiency, but also reduce energy consumption and extend the service life of the equipment.

[0015] Preferably, it also includes: a sensor system, which is arranged in the tank body; wherein the sensor system is electrically connected to the control unit, and the sensor system includes a plurality of turbidity sensors, which are arranged at intervals along the depth direction of the tank body. The sensor system is arranged in the tank body and is electrically connected to the control unit, and includes a plurality of turbidity sensors arranged at intervals along the depth direction of the tank body, so that the system can monitor the water quality conditions at different depths of the tank body in real time, and provide accurate data support for dredging decisions. By analyzing the turbidity data at different depths, the system can accurately determine the deposition and distribution of sludge, thereby optimizing the sludge discharge strategy. For example, when the turbidity at a certain depth exceeds a preset threshold, the system can automatically trigger the sludge discharge operation in the corresponding area. Compared with the traditional dredging at fixed time intervals, this dynamic dredging method based on real-time data can respond to actual needs more accurately, improve dredging efficiency, reduce unnecessary sludge discharge operations, and save energy and processing costs. This solution provides a closed-loop feedback system, which can be expressed by the transfer function H(s): H(s)=X(s)Y(s)=s+pK(s+z) Among them, Y(s) is the system output (dredging effect), X(s) is the system input (turbidity data), K is the system gain, z and p are zeros and poles respectively. By adjusting these parameters, the response characteristics of the system can be optimized.

[0016] Preferably, it also includes: a backwashing system, which is connected to the mud discharge pipe system; wherein the backwashing system includes a backwashing pump and a backwashing pipe, and the backwashing pipe and the mud discharge pipe system form a loop structure. The backwashing system is connected to the mud discharge pipe system, including a backwashing pump and a backwashing pipe, to form a loop structure. The electric valves arranged at intervals in coordination solve the problem of easy clogging of pipes in traditional mud discharge systems. Through backwashing, the system can effectively remove sludge and impurities attached to the inner wall of the pipe to prevent clogging caused by long-term accumulation. The loop structure design ensures that the backwashing water flow can cover the entire pipe system and improve the cleaning effect. The backwashing process can be described by the Bernoulli equation: P1+21ρv12+ρgh1=P2+21ρv22+ρgh2+ΔPloss The pressure difference provided by the backwash pump overcomes the pressure loss ΔPloss in the pipeline, ensuring sufficient flushing power. This design not only extends the service life of the system, but also reduces maintenance costs and downtime. Compared with traditional manual cleaning methods, the automatic backwash system greatly improves cleaning efficiency and safety.

[0017] Preferably, it also includes a sludge concentration gradient detection system, which includes a plurality of conductivity sensors, and the conductivity sensors are arranged at equal intervals along the depth direction of the tank body; wherein the sludge concentration gradient detection system is electrically connected to the control unit, and the control unit adjusts the opening and closing strategy of the electric valve group according to the detected sludge concentration gradient. This solution includes a plurality of conductivity sensors arranged at equal intervals along the depth direction of the tank body, which are electrically connected to the control unit, so that the system monitors the sludge concentration distribution at different depths of the tank body in real time, and provides accurate data support for dredging decisions. The conductivity sensor can indirectly reflect the sludge concentration by measuring the conductivity of water, and its principle can be expressed by the following formula: σ=k·C Among them, σ is conductivity, k is the proportional coefficient, and C is the sludge concentration. By analyzing the conductivity data at different depths, the system can accurately determine the deposition and distribution of sludge, thereby optimizing the sludge discharge strategy. The control unit adjusts the opening and closing strategy of the electric valve group according to the detected sludge concentration gradient to achieve dynamic dredging based on real-time data. Compared with the existing solution of dredging at fixed time intervals, it can respond to actual needs more accurately, improve dredging efficiency, reduce unnecessary sludge discharge operations, and save energy and processing costs.

[0018] Preferably, an overflow system is also included, and the overflow system includes: an overflow weir, which is arranged on the upper part of the pool body; an overflow pipe, which is connected to the overflow weir; an overflow well, which is connected to the overflow pipe; wherein the overflow weir is a weir plate structure with adjustable height, and the weir plate is connected to the pool body through an electric lifting device; the overflow pipe is a curved pipe structure, and a flow regulating valve is provided in the middle thereof; a water level sensor is provided in the overflow well, which is electrically connected to the control unit. The problem of water level fluctuation and overflow control in the pool body is solved. The height-adjustable weir plate is connected to the pool body through an electric lifting device, allowing the system to dynamically adjust the overflow water level according to actual needs. A flow regulating valve is provided in the middle of the overflow pipe of the curved pipe structure. This design can accurately control the overflow rate and prevent sudden large flows from impacting the downstream system. The water level sensor provided in the overflow well is electrically connected to the control unit to realize real-time water level monitoring and automatic adjustment. The flow of the overflow weir can be expressed by the following formula: Q = Cd·L·H3 / 2 Among them, Q is the overflow flow, Cd is the flow coefficient, L is the weir length, and H is the overflow head. By adjusting the weir height, the system can accurately control the overflow. This design has higher flexibility and adaptability than the traditional fixed height overflow weir.

[0019] Therefore, the present invention has the following beneficial effects: The sludge discharge pipeline system cooperates with the electric valve group to achieve accurate regional silt removal, improve sludge collection efficiency, reduce energy consumption, and extend equipment service life; The use of the sludge suction device in conjunction with the control unit enhances the system's ability to handle high-concentration and viscous sludge, reduces the risk of pipeline blockage, and improves the uniformity and continuity of sludge discharge; The design of the sedimentation area and inclined guide plate optimizes the water flow pattern, promotes sludge sedimentation, improves sedimentation efficiency, reduces short-circuit phenomenon, and creates favorable conditions for subsequent sludge discharge; The introduction of sensor systems and sludge concentration gradient detection systems enables real-time monitoring and dynamic dredging, improves dredging accuracy and efficiency, reduces unnecessary sludge discharge operations, and saves energy and processing costs; The loop design of the backwash system effectively prevents pipe blockage, extends system service life, reduces maintenance costs and downtime, and improves cleaning efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 yes Figure 1 Cross-sectional view at AA in the middle.

[0022] Figure 3 It is a cross-sectional view of the cell body at position BB in Example 2.

[0023] 1. Pool body, 2. Mud discharge port, 3. Mud discharge pipe system, 4. Electric valve group, 5. Overflow system, 6. Main mud discharge pipe, 7. Branch mud discharge pipe, 8. Mud suction device, 9. Sedimentation area, 10. Guide plate, 11. Overflow weir, 12. Overflow pipe, 13. Overflow well, 14. Turbidity sensor, 15. Backwash system, 16. Backwash pump, 17. Backwash pipe, 18. Conductivity sensor, 19. Inlet pipe, 20. Outlet pipe, 21. Diversion wall. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Example 1 like Figure 1 , 2As shown, the present invention provides an automatic desilting system for a disinfection contact pool, which is mainly composed of a pool body 1, a sludge discharge pipe system 3, a sludge suction device 8, a control unit and a sensor system. A sedimentation area 9 is provided at the bottom of the pool body 1, and an inclined guide plate 10 is provided, with an inclination angle of 15°-45°. This design effectively promotes sludge sedimentation and improves sedimentation efficiency. The sludge discharge pipe system 3 adopts a tree structure, including a main sludge discharge pipe 6 and a plurality of branch sludge discharge pipes 7. The main sludge discharge pipe 6 is connected to the sludge discharge port 2, and the branch sludge discharge pipes 7 are dispersedly connected to the main sludge discharge pipe 6. This structure increases the coverage area of ​​the system and ensures that the sludge in each area at the bottom of the pool body 1 can be effectively collected. An electric valve group 4 is provided on the branch sludge discharge pipe 7, and a spacing section is provided between each electric valve, with a length of 1.5-3 times the diameter of the electric valve. This spacing setting not only provides a buffer space for the sludge, reduces the risk of blockage, but also facilitates maintenance and cleaning. The sludge suction device 8 is installed at the outlet end of the main sludge discharge pipe 6 to provide additional power for sludge discharge, and is particularly suitable for treating high-concentration or viscous sludge. The control unit is composed of a timer and a microprocessor, and controls the opening and closing sequence and time interval of each electric valve according to the timer signal to achieve precise timing control. The sensor system includes a plurality of turbidity sensors 14 arranged at intervals along the depth direction of the tank body 1 to monitor the water quality conditions at different depths of the tank body 1 in real time. In addition, the system is also equipped with a sludge concentration gradient detection system, which monitors the sludge concentration distribution at different depths of the tank body 1 in real time through a plurality of conductivity sensors 18 arranged at equal intervals along the depth direction of the tank body 1. This design enables the system to dynamically adjust the dredging strategy according to the actual sludge distribution, greatly improving the dredging efficiency. Optical sensors or ultrasonic sensors are used instead of conductivity sensors 18 to obtain more accurate sludge concentration data. The innovation of this system lies in its high degree of integration and intelligence, and the adaptive dredging strategy is realized through sensor data and microprocessor control. Compared with the traditional fixed time interval dredging method, this system can respond to actual needs more accurately, reduce unnecessary sludge discharge operations, and save energy and processing costs. From the perspective of fluid mechanics, the tree-like pipeline structure and the electric valve group 4 arranged at intervals effectively reduce the pressure loss of the system and improve the overall sludge discharge efficiency.

[0026] Specifically, in this embodiment, an automatic dredging system suitable for a large disinfection contact pool is provided. The disinfection contact pool is a square structure with a side length of 25400mm, equipped with a DN600 water inlet pipe 19 (elevation 2.4m) and a DN800 water outlet pipe 20 (elevation 3.15m). A guide wall 21 is provided in the pool body 1, with a top elevation of 4.6m, and a low-level area is formed by a partition wall for discharging disinfected liquid or collecting and treating waste liquid after disinfection. A guide plate 10 with an inclination angle of 30° is provided at the bottom of the pool to promote the sludge to gather in the sedimentation area 9, balancing the sedimentation efficiency and structural stability.

[0027] The mud discharge pipe system 3 adopts a tree structure, with the main mud discharge pipe 6 having a diameter of 200mm and the branch mud discharge pipe 7 having a diameter of 100mm. According to the size of the pool body 1, the "cross + diagonal" layout is adopted, and the two main mud discharge pipes 6 are cross-crossed, dividing the pool body 1 into four areas, and two diagonal branch mud discharge pipes 7 are set in each area. A mud suction port is set every 3-5m on the branch mud discharge pipe 7 to ensure full coverage of the entire pool bottom and improve the dredging efficiency. A DN100 electric valve is installed every 6-8m on the branch mud discharge pipe 7, made of 304 stainless steel. The interval between adjacent electric valves is 250mm, which is 2.5 times the diameter of the valve. This design not only provides sufficient buffer space, but also ensures the continuity of pipeline dredging. The system is equipped with two 10kW mud suction pumps, which are connected to the outlet ends of the two main mud discharge pipes 6 respectively, providing sufficient power to meet the discharge needs of high-concentration sludge, while improving the redundancy and reliability of the system.

[0028] The control unit uses a high-performance 32-bit ARM microprocessor, combined with a precision timer, to achieve precise control of the entire system. The control strategy can be expressed as: T open (i) = f(C i ,H,Q,V), where T open (i) is the opening time of the i-th valve, C i is the sludge concentration at the valve position, H is the water level, Q is the flow rate, and V is the sludge volume. This control strategy can dynamically adjust the opening time and sequence of each valve according to real-time data.

[0029] The sensor system is equipped with a set of turbidity sensors 14 (range 0-1000NTU, accuracy ±2%) and conductivity sensors 18 (range 0-20mS / cm, accuracy ±0.5%) at the four corners and the center of the tank body 1. Each set of sensors is set every 1m along the depth direction, and a total of 5 depth points are set for measurement to comprehensively monitor the water quality and sludge concentration distribution at different positions and depths of the tank body 1.

[0030] The electric valve control strategy adopts a zone rotation desilting method, dividing the pool 1 into four zones, and the electric valves in each zone are opened and closed in a preset order. The opening time can be calculated using the following formula: T open =k*(C / C max )*(V / V max )*T base , where k is the adjustment coefficient, C is the current sludge concentration, C max is the set maximum sludge concentration, V is the estimated sludge volume, V max is the maximum volume of the pipeline, T base This dynamic adjustment mechanism ensures that the system can accurately desilt according to the actual sludge distribution and avoid unnecessary energy consumption.

[0031] Specifically, the contact disinfection pool provided by this solution realizes uninterrupted sludge discharge and prevents pipeline blockage, dynamically adjusts the dredging strategy according to the actual sludge distribution, and improves the dredging efficiency. After the system is started, the 32-bit ARM microprocessor of the control unit first receives real-time data from the turbidity sensor 14 and the conductivity sensor 18. These sensors are distributed at the four corners and the center of the pool body 1, and one is set every 1m along the depth direction, with a total of 5 depth points, to comprehensively monitor the water quality and sludge concentration distribution at different positions and depths of the pool body 1. The microprocessor calculates the sludge distribution based on these data, and dynamically generates a dredging strategy in combination with parameters such as water level and flow.

[0032] In actual operation, two main mud discharge pipes 6 with a diameter of 200mm are arranged in a cross, dividing the pool body 1 into four areas. Two diagonal branch mud discharge pipes 7 with a diameter of 100mm are set in each area, and a mud suction port is set every 3-5m on the branch mud discharge pipe 7. Electric valves (DN100, 304 stainless steel) are installed every 6-8m, and the interval between adjacent electric valves is 250mm. This layout ensures comprehensive coverage of the entire pool bottom, while providing sufficient buffer space to effectively prevent pipe blockage. During the dredging process, the system will open the electric valves in each area in turn according to the preset order. In this embodiment, a "spiral" dredging strategy is adopted to dredge from the edge of the pool body 1 to the center; a "diagonal" dredging strategy can also be adopted to alternately clean the diagonal areas. The specific strategy can be optimized and adjusted according to the actual sludge deposition situation. At the same time, two 10kW sludge suction pumps are respectively connected to the outlet ends of the two main mud discharge pipes 6 to provide sufficient power to ensure the smooth discharge of high-concentration sludge.

[0033] In addition, in this embodiment, technicians can further introduce the following optimization solutions: First, introduce a self-cleaning function. After each dredging, use clean water to backwash the pipeline to further reduce the risk of blockage. Second, add a pressure sensor to monitor the pressure changes in the pipeline and detect potential blockage problems in time. Third, combine artificial intelligence technology, such as machine learning algorithms, to analyze historical dredging data, predict sludge deposition trends, achieve preventive dredging, and further improve system efficiency.

[0034] In practical applications, the system can be widely used in municipal sewage treatment plants, industrial wastewater treatment facilities and other scenarios. For example, in a sewage treatment plant with a daily processing capacity of 100,000 tons, the system can reduce the frequency of traditional manual dredging from 1-2 times a month to once a quarter, greatly reducing labor costs and production stoppage losses. At the same time, since dredging is more timely and uniform, the disinfection effect can be improved and the amount of disinfectant can be reduced by 5-10%. From the perspective of economic benefits, it is preliminarily estimated that the system can save 500,000 to 1 million yuan in operating costs for medium-sized sewage treatment plants each year. In addition, the automation and intelligent characteristics of the system also provide important support for the digital transformation of sewage treatment plants, which is conducive to improving overall operational efficiency and management level.

[0035] Example 2 like Figure 3 As shown, this embodiment is based on the automatic desilting system of the disinfection contact tank in Example 1, and further introduces a backwashing system 15, a sludge concentration gradient detection system and an intelligent control algorithm to greatly improve the automation level and desilting efficiency of the system. The entire system consists of a tank body 1, a sludge discharge pipe system 3, a sludge suction device 8, a control unit, a sensor system, a backwashing system 15 and a sludge concentration gradient detection system, forming a closed-loop intelligent desilting solution.

[0036] The backwash system 15 is the key core of this embodiment, which includes a backwash pump 16 (rated power 15kW, maximum flow rate 100m 3 / h, maximum head 60m) and a backwash pipe system reversely connected to the mud discharge pipe. The backwash pipe 17 is made of 304 stainless steel and has a diameter of 1 / 2 of the mud discharge pipe, that is, the main backwash pipe is 100mm and the branch backwash pipe is 50mm. A three-way valve is set at the front end of each electric valve to switch the mud discharge and backwash modes. The backwash system 15 uses high-pressure water flow to reversely flush the mud discharge pipe to effectively remove pipe wall attachments and potential blockages. The system can automatically or manually start the backwash program as needed. It is generally recommended to perform a comprehensive backwash once a week, each time lasting 15-20 minutes.

[0037] The sludge concentration gradient detection system consists of a plurality of conductivity sensors 18 arranged at equal intervals along the depth direction of the tank body 1. According to the size of the tank body 1 of 25400mm, a group of sensors is set at the four corners and the center of the tank body 1. Each group contains 5 sensors, and one is set every 1m from the bottom of the tank upwards, forming a 5x5 three-dimensional monitoring network. The range of each sensor is 0-50mS / cm, the accuracy is ±0.5%, and the sampling frequency is 1Hz. This arrangement can accurately capture the vertical and horizontal distribution of the sludge concentration in the tank body 1, and provide high-quality input data for the intelligent control algorithm.

[0038] Intelligent control algorithms are the key to organically combining the above hardware systems. The algorithms are based on machine learning technology and mainly include three modules: data preprocessing, pattern recognition, and decision optimization. The data preprocessing module filters and standardizes sensor data; the pattern recognition module uses convolutional neural networks (CNNs) to identify sludge distribution patterns; and the decision optimization module uses reinforcement learning algorithms, such as Deep Q-Network (DQN), to generate the optimal dredging strategy based on recognition results and historical data.

[0039] The control strategy can be expressed as: At=f(St,θ) Among them, A_t represents the action at time t (such as which electric valves are opened, backwashing is started, etc.), S_t represents the system state at time t (including sludge distribution, water level, flow, etc.), and θ represents the model parameters. The model optimizes the parameters by minimizing the long-term cumulative reward: θ*=argθmaxE[t=0∑∞γtRt] Among them, γ is the discount factor and R_t is the immediate reward, which can be defined as the weighted sum of silt removal efficiency and energy consumption.

[0040] Compared with the traditional fixed-time dredging method, this intelligent control solution can respond to actual needs more accurately, reduce unnecessary dredging operations, and significantly improve energy efficiency. Theoretical analysis and preliminary experiments show that this solution can increase dredging efficiency by more than 30% while reducing energy consumption by about 20%.

[0041] The reliability and robustness of the system are also significantly improved. The introduction of the backwash system 15 greatly reduces the risk of pipeline blockage and extends the maintenance cycle of the system. The high-precision and high-density arrangement of the sludge concentration gradient detection system enables the system to quickly respond to slight changes in the sludge distribution in the tank body 1, effectively preventing the occurrence of local deposition and short-circuit phenomena.

[0042] In addition, the system has good scalability and adaptability. By adjusting the sensor layout and optimizing the control algorithm, it can easily adapt to disinfection contact pools of different sizes and shapes. Even more advanced sensing technologies, such as fiber-optic distributed sensing systems, can be introduced to further improve monitoring accuracy and spatial resolution. In terms of algorithms, it is possible to explore the introduction of transfer learning technology and use historical data from other sewage treatment facilities to accelerate the optimization process of the new system, shorten the debugging cycle, and improve the versatility of the system.

[0043] Example 3 In this embodiment, on the basis of embodiment 1, an overflow system 5 is introduced to further improve the reliability and adaptability of the automatic desilting system of the disinfection contact pool. The overflow system 5 includes: an overflow weir 11, which is arranged on the upper part of the pool body; an overflow pipe 12, which is connected to the overflow weir 11; an overflow well 13, which is connected to the overflow pipe 12; wherein the overflow weir 11 is a weir plate structure with adjustable height, and the weir plate is connected to the pool body through an electric lifting device; the overflow pipe 12 is a curved pipe structure, and a flow regulating valve is arranged in the middle thereof; a water level sensor is arranged in the overflow well 13, which is electrically connected to the control unit.

[0044] The overflow system is arranged at the upper part of the disinfection contact tank, including an overflow weir 11, an overflow pipe 12 and an overflow well 13. The overflow weir 11 adopts a weir plate structure with adjustable height, which is connected to the tank body through an electric lifting device. The weir plate is made of 304 stainless steel, with a width of 1 / 4 of the circumference of the tank body, and the height can be adjusted within a range of 15 cm above and below the normal water level. This design can effectively increase the overflow capacity, prevent the overflow weir 11 from being blocked, and achieve more precise water level control.

[0045] The overflow pipe 12 is connected to the overflow weir 11 and adopts a curved pipe structure with a diameter of 500 mm. It uses high-density polyethylene (HDPE) material with good corrosion resistance and fluidity. The slope of the overflow pipe 12 is maintained between 1% and 2% to ensure that the overflow water can flow smoothly to the overflow well 13. A flow regulating valve is provided in the middle of the overflow pipe 12, which can remotely control the overflow direction and flow rate to improve the flexibility of the system.

[0046] The overflow well 13 is connected to the overflow pipe 12 and is located downstream of the disinfection contact tank. Its volume is 20% of the disinfection contact tank, which is about 2,600 cubic meters. The overflow well 13 adopts a reinforced concrete structure, and the inner wall is coated with an epoxy resin anti-corrosion layer. The bottom of the well is designed to be conical with a slope of 3%, which is convenient for collecting and cleaning sediments. A water level sensor is provided in the overflow well 13, which is electrically connected to the control unit for real-time monitoring of water level changes. The overflow well 13 is equipped with two submersible pumps (each with a power of 15kW and a flow rate of 100m 3 / h), the overflow water can be pumped back to the disinfection contact tank or transported to subsequent treatment units.

[0047] The overflow system provides a safety valve to prevent the risk of overflowing the tank due to a sudden increase in water intake or equipment failure. In addition, by accurately controlling the water level, the contact time of the disinfectant can be optimized and the disinfection effect can be improved. Furthermore, the recycling of overflow water reduces water waste and improves the overall efficiency of the system. From the perspective of fluid mechanics, the existence of the overflow system can effectively alleviate hydraulic shock, reduce turbulence in the tank, and is conducive to the improvement of sludge sedimentation and dredging effects.

[0048] The operation process of the entire overflow system can be divided into the following stages: Initialization phase: When the system starts, the control unit first performs a self-check on the water level sensor. At the same time, the system calibrates the height of the weir plate of the overflow weir 11 to ensure that it is in the preset normal working state. This process usually takes 5-10 minutes to complete.

[0049] Conventional operation stage: Under normal operation, the system monitors the water level changes in real time through the water level sensor in the overflow well 13. After processing, these data are input into the liquid level regulation model based on fuzzy control.

[0050] Emergency response stage: When a sudden increase in water inflow or system abnormality is detected, the control unit will immediately start the emergency response procedure. First, the system will lower the height of the overflow weir 11 through the electric lifting device to increase the overflow capacity. At the same time, the submersible pump in the overflow well 13 will automatically start to pump the overflow water back to the treatment system or transport it to the subsequent treatment unit. The response time of this process is usually controlled within 30 seconds to ensure that the system can respond quickly to emergencies.

[0051] System recovery stage: When the abnormal situation is under control and the water level begins to fall, the system will gradually adjust the height of the overflow weir 11 to slowly restore the water level to the normal range. This process uses the PID control algorithm, and by adjusting the parameters, the water level can be smoothly restored to avoid overshoot or undershoot.

[0052] Maintenance and cleaning stage: The system will perform self-cleaning and maintenance regularly. Once a week, the system will automatically start the backwashing procedure of the overflow weir 11 and the overflow pipe 12, using high-pressure water to remove possible sediments. At the same time, the conical design at the bottom of the overflow well 13 facilitates the collection of sediments. The system will start the bottom mud pump once a month to clean up the accumulated sediments.

[0053] The analysis of actual application in production shows that the introduction of the overflow system can significantly improve the operational stability and treatment efficiency of the disinfection contact pool. Taking a sewage treatment plant with a daily processing capacity of 100,000 tons as an example, after the introduction of the overflow system, the system can still keep the water level fluctuation within ±5cm when facing an instantaneous flow fluctuation of 20% to 30%, which is 60% more stable than the traditional solution. At the same time, by precisely controlling the water level, the utilization efficiency of the disinfectant is increased by 8% to 12%, and the annual cost savings are about 500,000 yuan. From the perspective of fluid mechanics, the existence of the overflow system effectively reduces the hydraulic short-flow phenomenon and improves the uniformity of the residence time of sewage in the pool. According to the simulation results of computational fluid dynamics (CFD), the standard deviation of the residence time distribution curve is reduced by 25%, further improving the disinfection effect. In addition, the intelligent control and data acquisition functions of the overflow system provide important support for the intelligent operation of the sewage treatment plant. Combined with big data analysis and artificial intelligence technology, more refined operation management and predictive maintenance can be achieved. It is expected that the equipment failure rate can be reduced by more than 30%, further improving the overall efficiency and reliability of the system.

Claims

1. A contact disinfection pool capable of automatic dredging, characterized in that: include: A pool body, wherein a plurality of mud discharge ports are provided at the bottom of the pool body; A mud discharge pipeline system, connected to the mud discharge port; An electric valve group is arranged on the mud discharge pipeline system; A control unit, electrically connected to the electric valve group; The control unit controls the alternate opening and closing of the electric valve group to prevent blockage and ensure uninterrupted mud discharge in the mud discharge pipeline system.

2. The contact disinfection tank according to claim 1, characterized in that: The mud discharge pipeline system comprises: A main mud discharge pipe, connected to the mud discharge port; A plurality of mud discharge pipes connected to the main mud discharge pipe; Wherein, the electric valve groups are respectively arranged on the branch mud discharge pipes.

3. The contact disinfection tank according to claim 2, characterized in that: Also includes: A mud suction device, arranged at the outlet end of the main mud discharge pipe; Wherein, the mud suction device is electrically connected to the control unit.

4. The contact disinfection tank according to claim 1, characterized in that: Also includes: A sedimentation zone, arranged at the bottom of the tank body; The guide plate is obliquely arranged above the sedimentation area, and the inclination angle of the guide plate is 15°-45°.

5. The contact disinfection tank according to any one of claims 1 to 4, characterized in that: The electric valve group includes a plurality of electric valves, and a spacing section is provided between adjacent electric valves. The length of the spacing section is 1.5-3 times of the diameter of the electric valve.

6. The contact disinfection tank according to claim 5, characterized in that: The control unit includes a timer and a microprocessor. The microprocessor controls the opening and closing sequence and time interval of each electric valve according to a signal from the timer.

7. The contact disinfection tank according to claim 1, characterized in that: Also includes: A sensor system is arranged in the pool body; wherein the sensor system is electrically connected to the control unit, and the sensor system includes a plurality of turbidity sensors arranged at intervals along the depth direction of the pool body.

8. The contact disinfection tank according to claim 1, characterized in that: Also includes: A backwashing system, connected to the mud discharge pipeline system; Wherein, the backwashing system comprises a backwashing pump and a backwashing pipeline, and the backwashing pipeline and the mud discharge pipeline system form a loop structure.

9. The contact disinfection tank according to claim 1, characterized in that: Also includes: The sludge concentration gradient detection system comprises a plurality of conductivity sensors which are arranged at equal intervals along the depth direction of the tank body; The sludge concentration gradient detection system is electrically connected to the control unit, and the control unit adjusts the opening and closing strategy of the electric valve group according to the detected sludge concentration gradient.

10. The contact disinfection tank according to claim 1, characterized in that: It also includes an overflow system, which includes: an overflow weir, which is arranged on the upper part of the pool body; an overflow pipe, which is connected to the overflow weir; and an overflow well, which is connected to the overflow pipe; wherein the overflow weir is a weir plate structure with adjustable height, and the weir plate is connected to the pool body through an electric lifting device; the overflow pipe is a curved pipe structure, and a flow regulating valve is provided in the middle thereof; a water level sensor is provided in the overflow well, which is electrically connected to the control unit.

Images