A system for removing sand from a sewage pool without stopping water

Abstract

The present invention discloses a system for removing accumulated sand from a sewage pool without stopping the water supply, and belongs to the technical field of sand removal in normalized operation and maintenance of sewage treatment. The system comprises a central processing unit, which is connected to a detection and analysis unit, a sand suction unit, a sand-water separation unit, an electrical control unit, and an auxiliary unit; the detection and analysis unit is used to scan the sewage pool using a multi-beam sonar, obtain high-density point cloud data in real time, and use dynamic threshold filtering to remove noise points caused by bubbles and suspended matter in the water body; the sand suction unit is used to suck accumulated sand and discharge it to the sand-water separation unit; the sand-water separation unit is used to separate sand particles and sewage; the electrical control unit and the auxiliary unit are used to automatically control the functional units and process the waste generated by the functional units. The present invention can directly remove sand from water treatment structures without emptying the pool body. The normal operation of the biochemical pool is not affected during the sand cleaning process, the impact of emptying and cleaning the pool on production is avoided, and the operating cost can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment normalization operation and sand removal, and particularly relates to a system for removing accumulated sand in a sewage pool without stopping water supply. BACKGROUND

[0002] Due to the influence of construction quality and operation management and other factors, the influent of urban sewage plants in China generally has low organic matter concentration and high sand content. Most sewage treatment plants choose to cancel the primary sedimentation tank to reduce the loss of carbon source in sewage, and rely on the sand trap as the main measure to remove inorganic sand particles in the influent. In the "Outdoor Drainage Design Standard" (GB50014-2021), it is stipulated that a sand trap should be set for sewage treatment, and the sand trap should be designed to remove sand particles with a relative density of 2.65 and a particle size of 0.2 mm or more. However, there are significant spatial and temporal differences in sand content and particle size distribution of urban sewage in different cities. The existing standard lacks universality for the sand characteristics of urban sewage under different conditions, and cannot meet the sand characteristics of the influent of different sewage plants. The actual sand removal effect is not ideal. Some researchers conducted a one-year investigation on the influent quality of five sewage plants in Jinan City and a survey of 10 sand traps, and found that the actual daily operation sand removal amount of the sand trap was only 10% of the theoretical value.

[0003] Some other researchers conducted a survey and analysis of the sand removal of six sewage treatment plants in different cities in China. The currently widely used aeration sand trap and Buss cyclone sand trap have a weighted average sand removal rate of the sand removal system of up to 52%, and the lowest is less than 10%. A large number of sand particles entering the subsequent sewage treatment system will accelerate the wear of pumps, propellers and other equipment, and smaller sand particles are easily wrapped by activated sludge and eventually enter the sludge treatment system, reducing the proportion of organic matter in the sludge and increasing the disposal difficulty.

[0004] On the other hand, the sand particles with a larger particle size entering the biochemical system are prone to accumulate at the bottom of the area where the mixing flow rate of the structure is insufficient or the flow is blocked, occupy the pool space, reduce the effective pool capacity, reduce the treatment efficiency of the biochemical pool, and increase the operation energy consumption. Long-term accumulation of sand particles can also cause anaerobic gas production of the attached organic matter, increasing the carbon emissions of the wastewater treatment process. Therefore, the wastewater treatment plant needs to regularly remove the accumulated sand in the treatment structure. At present, the method for treating the accumulated sand in the wastewater pool is generally to manually remove the accumulated sand by stopping water and emptying the pool according to experience, or to use a sewage suction vehicle for suction operation. These methods have the following disadvantages: 1. The accumulated sand in the wastewater treatment pool cannot be directly identified visually, and the amount of accumulated sand, the distribution of accumulated sand and the desilting period can only be estimated by experience. 2. Manual removal needs to stop water treatment and empty the pool, which will affect normal production during the stoppage for removal. The stoppage for removal is generally arranged in the season with low wastewater treatment capacity, otherwise it is difficult to cope with the unexpected increase in sand amount in the wet season. 3. Manual removal of the wastewater treatment pool has a large amount of operation labor, poor sanitary conditions, harmful gases, poor operation environment and high personnel safety risk. 4. If the pool is not emptied, the suction vehicle cannot achieve the desired cleaning effect, and if the pool is emptied, it will also affect production, and the accumulated sand sucked out has high water content and organic matter content, which needs to be separately treated and disposed.

[0005] At present, the dredging industry also has some other methods for river and lake sediment desilting, but they are not suitable for use in wastewater treatment structures and other facilities, mainly in the following aspects: the suction device cannot be used for fine operation under the condition that a large number of underwater facilities and equipment are installed in the wastewater treatment structure, which may cause damage to the underwater facilities and equipment; the separation precision of the sand-water separation of the suctioned mud and sand cannot meet the standard requirements of the wastewater treatment system; the equipment integration of the desilting facility cannot meet the mobile operation demand of the limited conditions in the wastewater treatment plant; it is not suitable for the effective identification operation of the complex conditions of gas, liquid and solid three-phase in the water operation of the wastewater treatment structure and the three-dimensional space obstacles under water.

[0006] In summary, the wastewater treatment structure needs to accurately identify the three-dimensional space of the complex underwater conditions, fine suction desilting operation, high-precision sand-water separation, and meet the mobile operation demand of the limited space conditions. SUMMARY

[0007] The purpose of the present application is to overcome the shortcomings of the prior art and provide a system for removing accumulated sand in a wastewater pool without stopping water.

[0008] The application aims at realizing the technical scheme of a system for removing accumulated sand in a sewage pool without stopping water supply, comprising a central processing unit connected with a detection and analysis unit, an accumulated sand suction unit, a sand-water separation unit, an electric control and auxiliary unit; the detection and analysis unit is used for scanning the sewage pool by using a multi-beam sonar, acquiring real-time high-density point cloud data, and removing noise points caused by water body bubbles and suspended matters by using dynamic threshold filtering; the accumulated sand suction unit is used for sucking and discharging accumulated sand to the sand-water separation unit; the sand-water separation unit is used for separating sand particles and sewage; the electric control and auxiliary unit is used for automatically controlling the detection and analysis unit, the accumulated sand suction unit and the sand-water separation unit, and processing waste generated by the detection and analysis unit, the accumulated sand suction unit and the sand-water separation unit.

[0009] Preferably, the detection and analysis unit comprises a three-dimensional scanning device, an echo analysis processing module and an intelligent three-dimensional modeling module.

[0010] When performing detection and analysis, the environmental optimization feature extraction layer of the sewage pool labels the point cloud of the fixed target, automatically aligns the recognized equipment point cloud with the preset BIM model library, generates a three-dimensional model of the pool body and equipment, generates a sand setting surface model by using a moving least square method, calculates the sand setting volume by voxelization grid integration, displays the three-dimensional model and data by using WebGL or Unity, and performs cross-section analysis and dynamic rendering of the sand thickness heat map.

[0011] Preferably, the accumulated sand suction unit comprises a water suction and sand suction head, a sand suction main pipe and a sand suction pump.

[0012] When performing accumulated sand suction, the sand suction pump forms negative pressure in the sand suction main pipe, the water suction and sand suction head of the sand suction cover is inserted into the accumulated sand surface, the water suction and sand suction head of the water suction pipe is driven by the negative pressure to flow the sewage in the pool from top to bottom and finally into the sand suction main pipe, and the sand at the bottom of the pool is fluidized under the impact of the sewage flow and enters the sand suction main pipe to be discharged to the sand-water separation unit; the outlet of the water suction pipe is axially formed with a ring-shaped angle with the sand suction main pipe, so that the water flow forms a vortex in the sand suction cover, enhancing the fluidization and lifting effect of the accumulated sand; during the suction process, the sand suction pump works at a set frequency to maintain stable suction flow.

[0013] Preferably, the sand-water separation unit comprises a buffer tank, a sand setting device, a sand lifting pump and a sand washing and separating device.

[0014] When sand-water separation is performed, the sand-water mixture sucked by the accumulated sand suction unit is discharged into the sand setting device through the sand suction main pipe, and under the action of the shallow layer setting and vortex sweeping of the sand setting device, the sand particles are settled to the sand accumulation hopper at the bottom of the sand setting device, and are continuously or intermittently sucked out of the pool body by the sand pumping pump to enter the sand washing and separating device to realize sand-water separation; the overflow sewage of the sand setting device and the backflow sewage of the sand washing and separating device are both discharged into the buffer tank, and the sand particles separated by the sand washing and separating device are concentrated and disposed together with the sand discharge of the sand setting pool of the sewage treatment plant.

[0015] Preferably, the sand-water separation unit controls the sand removal precision according to the particle size distribution characteristics of the sand in the influent of the sewage treatment plant.

[0016] Preferably, the electric control and accessory unit comprises a deodorization device, a water pump frequency conversion control box and a transportation platform; the water pump frequency conversion control box is used for automatically regulating and controlling the functional units; the deodorization device is used for collecting and treating the odor generated by the sand-water separation unit; and the transportation platform is used for integrated work and transportation vehicle equipment of the whole system.

[0017] Preferably, when the accumulated sand is removed without stopping water, the following steps are included:

[0018] The construction sand accumulation detection and analysis stage: the inside of the sand removal construction is detected and the underwater sand accumulation distribution, position and depth are clearly located, the relative spatial position of the underwater obstacles is detected, three-dimensional modeling is performed, and the sand accumulation amount is analyzed and counted;

[0019] The sand removal work plan drafting stage: the sand removal suction required work duration is calculated, the configuration parameters of the sand-water separation unit and the related equipment are determined, and the underwater sand removal work route is designed, and the configuration parameters include the specifications of the sand setting device and the sand washing and separating device, the water pump flow head and the working frequency;

[0020] The sand suction stage: the sand suction work is carried out according to the sand removal work plan, the change of the underwater sand accumulation surface of the construction is detected in real time, the suction route is revised in real time, and the sand setting, sand washing and sand separating work are carried out at the same time;

[0021] The effect evaluation stage: after the sand removal work plan is completed, the inside of the construction is detected again and compared with the initial modeling data, the sand removal effect is evaluated and the actual sand removal amount is determined.

[0022] The beneficial effects of the present application are:

[0023] 1) For the water treatment construction, the pool body can be directly subjected to sand removal operation without emptying, the normal operation of the biochemical pool is not affected during the sand removal process, the influence of emptying and cleaning on production is avoided, and the operation cost can be reduced.

[0024] 2) The sand removal process does not require workers to go to the bottom of the pool, and the operation is directly on the pool surface, which basically avoids the direct contact of workers with sludge and possible toxic and harmful gas hazards, greatly reducing the safety risk of personnel.

[0025] 3) By precise detection and intelligent modeling, a three-dimensional underwater space map is constructed, precise positioning of suction is realized, collision with underwater facilities and equipment during operation is avoided, and the processing efficiency is greatly improved.

[0026] 4) The system simultaneously realizes cleaning and high-precision sand-water separation of the extracted sand-water mixture, and the sewage is returned to the treatment system. The sand particles separated from the organic matter and water can be directly disposed of with the sand removal of the sewage plant, reducing the additional treatment cost.

[0027] 5) It can accurately identify the change of sand accumulation before and after operation, and realize the measurement and evaluation of operation effect.

[0028] 6) The invention is not only suitable for sewage treatment structures, but also suitable for other similar silt and sand suction and removal operations in pools or water bodies. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 System block diagram for removing accumulated sand in a sewage pool without stopping water;

[0030] Fig. 2 Structure diagram of the water suction sand suction head;

[0031] Fig. 3 System workflow diagram for removing accumulated sand in a sewage pool without stopping water;

[0032] In the figure, 1 is a sand suction main pipe joint; 2 is a sand suction cover; and 3 is a water inlet pipe. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0034] Reference Figs. 1-3The application provides a technical scheme: a system for removing accumulated sand in a sewage pool without stopping water supply, comprising a central processing unit connected with a detection and analysis unit, an accumulated sand suction unit, a sand-water separation unit, an electric control and auxiliary unit; the detection and analysis unit is used for scanning the sewage pool by using a multi-beam sonar, acquiring real-time high-density point cloud data, and removing noise points caused by water body bubbles and suspended solids by using dynamic threshold filtering; the accumulated sand suction unit is used for sucking and discharging accumulated sand to the sand-water separation unit; the sand-water separation unit is used for separating sand particles and sewage; and the electric control and auxiliary unit is used for automatically regulating and controlling the detection and analysis unit, the accumulated sand suction unit and the sand-water separation unit, and processing waste generated by the detection and analysis unit, the accumulated sand suction unit and the sand-water separation unit.

[0035] In the embodiment, the high-density point cloud data can reach 10,000+ points per second, the system provided by the application is suitable for accurately sucking accumulated sand at the bottom of a water treatment structure of a sewage treatment plant without emptying the pool and stopping production, and can realize sand-water separation of the sucked sand-water mixture according to the sand removal requirements of sewage treatment, so that the sewage after sand removal is returned to the treatment system, the sand particles are transported out for disposal, which helps to reduce the operation cost of the sewage plant and reduce the carbon emission of sewage treatment. The application can carry out pool bottom sand removal work in the normal operation state of the sewage treatment structure, realize underwater detection, accurate positioning of sand suction with water, and synchronous sand washing and separation; the detection and analysis unit of the application adopts sonar technology + image recognition technology for real-time real scene three-dimensional modeling in the underwater detection of the complex environment of gas, liquid and solid three phases, and the error is ±1cm; the sand suction operation process can realize instant scanning, real-time positioning and synchronous correction of the three-dimensional model of the pool body solid-liquid interface; the sand-water separation unit of the application utilizes the cyclone principle to realize synchronous cyclone sand setting, cyclone cleaning separation of sand particles and organic matters and spiral sand separation of the sand-water mixture sucked out, and the separation precision of the cyclone sand setting can reach a sand particle removal rate of >85% with specific gravity >2.65 and particle size >0.075mm, the sand particle recovery rate of the sand washing and separation is >90%, the organic matter content of the discharged sand particles is <15%, and the water content is <40%.

[0036] In some embodiments, the detection and analysis unit comprises a three-dimensional scanning device, an echo analysis processing module and an intelligent three-dimensional modeling module.

[0037] When performing detection and analysis, the environmental optimization feature extraction layer of the sewage pool labels the point cloud of the fixed target, automatically aligns the recognized equipment point cloud with the preset BIM model library, generates a three-dimensional model of the pool body and equipment, generates a sand setting surface model by using a moving least square method, and calculates the sand volume by integrating the voxel grid; the three-dimensional model and data are displayed by using WebGL or Unity, and the cross section analysis and dynamic rendering of the sand thickness heat map are performed.

[0038] In this embodiment, the probe analysis unit uses a multi-beam sonar to scan the sewage pool, and obtains high-density point cloud data (10,000+ points per second) in real time. Dynamic threshold filtering is used to remove noise points caused by water bubbles and suspended solids. The feature extraction layer is optimized for the sewage pool environment. The pool wall, pipeline, pump, and other fixed targets are labeled with point clouds. The identified device point cloud is automatically aligned with the preset BIM model library (such as the pool body, sewage pump, and valve). A three-dimensional model of the pool body and fixed targets such as equipment is generated. The moving least squares method (MLS) is used to generate a sand setting surface model. The sand volume is calculated by voxelizing the grid integral. The three-dimensional model and data are displayed using WebGL or Unity tools, supporting multi-angle viewing, profile analysis, dynamic rendering of sand thickness heat maps, and other functions.

[0039] In some embodiments, the sand accumulation suction unit includes a water suction sand suction head, a sand suction main pipe, and a sand suction pump.

[0040] During sand accumulation suction, the sand suction pump forms a negative pressure in the sand suction main pipe. When the sand suction cover 2 of the water suction sand suction head is inserted into the sand accumulation surface, the water guide pipe 3 of the water suction sand suction head is driven by the negative pressure to guide the sewage in the pool from top to bottom and finally into the sand suction main pipe. At the same time, under the impact of the sewage flow, the sand at the bottom of the pool is fluidized and enters the sand suction main pipe to be discharged to the sand-water separation unit. The lower end outlet of the water guide pipe 3 forms an angular offset with the axial direction of the sand suction main pipe, which forms a vortex in the sand suction cover 2 and enhances the fluidization and lifting effect of the sand accumulation. During the suction process, the sand suction pump works at a set frequency to maintain stable suction flow.

[0041] In this embodiment, the water suction sand suction head is provided with four water guide pipes 3. Under the action of suction negative pressure, the water guide pipes 3 guide the sewage in the upper part of the sand accumulation layer downward into the sand suction cover 2 and the sand suction main pipe, and form a local rotational flow in the sand suction cover 2 to impact the sand accumulation layer, fluidize the sand accumulation, and enter the sand suction main pipe to be discharged to the sand-water separation unit. The end of the sand suction head has a piercing and loosening effect on the hardened sand layer. The lower end outlet of the water guide pipe 3 has a certain arc and forms an angular offset with the axial direction of the sand suction main pipe, which helps to form a vortex in the sand suction cover and enhances the fluidization and lifting effect of the sand accumulation.

[0042] In some embodiments, the sand-water separation unit includes a buffer tank, a sand setting device, a sand lifting pump, and a sand washing and separating device.

[0043] When sand-water separation is performed, the sand-water mixture extracted by the accumulated sand suction unit is discharged into the sand settling device through the sand suction main pipe, and under the action of shallow layer sedimentation and vortex sweeping of the sand settling device, the sand particles settle in the sand accumulation hopper at the bottom of the sand settling device, and are continuously or intermittently sucked out of the pool body by the sand pumping pump to enter the sand washing and separating device to realize sand-water separation; the overflow sewage of the sand settling device and the backflow sewage of the sand washing and separating device are both discharged into the buffer tank, and are transported back to the sewage treatment structure by the water pump in the buffer tank, and the sand particles separated by the sand washing and separating device are disposed together with the sand particles discharged from the sand settling tank of the sewage treatment plant.

[0044] In the embodiment, the sand-water mixture extracted by the accumulated sand suction unit is discharged into the sand settling device through the sand suction main pipe, and under the action of shallow layer sedimentation and vortex sweeping of the sand settling device, the sand particles settle in the sand accumulation hopper at the bottom of the sand settling device, and are continuously or intermittently sucked out of the pool body by the sand pumping pump to enter the sand washing and separating device to realize the final sand-water separation. The overflow sewage of the sand settling device and the backflow sewage of the sand washing and separating device are both discharged into the buffer tank, and are transported back to the sewage treatment structure by the water pump in the buffer tank, and the sand particles separated by the sand washing and separating device are disposed together with the sand particles discharged from the sand settling tank of the sewage treatment plant. The sand-water separation unit can control the sand removal precision according to the sand particle size distribution characteristics of the influent of the sewage treatment plant, and the design precision can reach a sand particle removal rate of > 85% for sand particles with specific gravity > 2.65 and particle size > 0.075 mm, and an organic matter content of < 15% and a water content of < 40%.

[0045] In some embodiments, the sand-water separation unit controls the sand removal precision according to the sand particle size distribution characteristics of the influent of the sewage treatment plant.

[0046] In some embodiments, the electric control and auxiliary unit includes a deodorization device, a water pump frequency conversion control box, and a transportation platform; the water pump frequency conversion control box is used for automatic regulation and control of the functional units; the deodorization device is used for collecting and processing the odor generated by the sand-water separation unit; and the transportation platform is used for integrated work and transportation of the whole system.

[0047] In the embodiment, the water pump frequency conversion control box realizes automatic regulation and control of the sand suction pump and the backflow sewage pump. The deodorization device collects and processes the odor generated by the sand-water separation unit to realize standard emission of tail gas. The transportation platform is a vehicle device for integrated work and transportation of the whole system.

[0048] In some embodiments, when accumulated sand is removed without stopping water, the following steps are included:

[0049] The structure accumulated sand detection and analysis stage: the inside of the sand cleaning structure is detected and the distribution, position and depth of the underwater accumulated sand are clearly located, the relative spatial position of the underwater obstacles is detected, three-dimensional modeling is performed, and the amount of accumulated sand is analyzed and counted;

[0050] Sand cleaning work plan drafting stage: combined with the detection analysis results, the sand pumping work time is calculated, the configuration parameters of each related equipment of the sand-water separation unit are formulated, and the underwater sand cleaning work route is designed. The configuration parameters include the specifications of the sand setting device and the sand washing and separating device, the flow rate, head and working frequency of the water pump;

[0051] Sand pumping stage: according to the formulated sand cleaning work plan, the sand pumping work is carried out, the change of the underwater accumulated sand surface of the structure is detected in real time, the sand pumping route is revised in real time, and the sand setting, sand washing and sand separating work is carried out at the same time;

[0052] Effect evaluation stage: after the sand cleaning work plan is completed, the structure is detected again and compared with the initial modeling data, the sand cleaning effect is evaluated and the actual sand cleaning amount is checked.

[0053] The above is only the preferred embodiment of the present application, it should be understood that the present application is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein, by the above teaching or related art or knowledge. The modification and change made by the person skilled in the art without departing from the spirit and scope of the present application shall be within the protection scope of the appended claims of the present application.

Claims

1. A system for removing sand from a sewage pool without stopping the water flow, characterized by: The system comprises a central processing unit, which is connected to a detection and analysis unit, a sand suction unit, a sand-water separation unit, an electronic control unit and an auxiliary unit; the detection and analysis unit is used to scan the sewage pool using a multi-beam sonar, obtain high-density point cloud data in real time, and use dynamic threshold filtering to remove noise points caused by bubbles and suspended matter in the water; the sand suction unit is used to suck the accumulated sand and discharge it to the sand-water separation unit; The sand-water separation unit is used to separate sand and sewage; The electric control and auxiliary units are used to automatically control the detection and analysis unit, the accumulated sand suction unit and the sand-water separation unit, and process the waste generated by the detection and analysis unit, the accumulated sand suction unit and the sand-water separation unit; The detection and analysis unit includes a three-dimensional scanning device, an echo analysis and processing module, and an intelligent three-dimensional modeling module; During detection and analysis, fixed targets are labeled as point clouds in the sewage tank's environmental optimization feature extraction layer. The identified equipment point clouds are automatically aligned with the preset BIM model library to generate a 3D model of the tank and equipment. A moving least squares method is used to generate a sand surface model, and the sand volume is calculated through voxelized grid integration. The 3D model and data are displayed using WebGL or Unity, and cross-section analysis and dynamic rendering of sand thickness heat maps are performed. The sand suction unit includes a water suction and sand pumping head, a sand pumping main pipe, and a sand pumping pump; When sucking accumulated sand, the sand pump suction forms a negative pressure in the sand pumping main pipe. When the sand pumping cover of the water suction sand pumping head is inserted into the sand accumulation surface, the water diversion pipe of the water suction sand pumping head drains the sewage in the pool from top to bottom under the drive of the negative pressure and finally enters the sand pumping main pipe. At the same time, under the impact of the sewage flow, the sand accumulated at the bottom of the pool is fluidized and enters the sand pumping main pipe with the water flow and is discharged to the sand-water separation unit; the outlet at the lower end of the water diversion pipe forms an annular deflection angle with the axial direction of the sand pumping main pipe, so that the water flow forms a vortex in the sand pumping cover, thereby enhancing the fluidization and lifting effect of the accumulated sand; during the suction process, the sand pump works according to the set frequency to maintain a stable suction flow.

2. The system for removing accumulated sand from a sewage pool without stopping water supply according to claim 1, characterized in that: The sand-water separation unit includes a buffer water tank, a sand settling device, a sand lifting pump, and a sand washing and separating device; During sand-water separation, the sand-water mixture extracted by the sand suction unit is discharged into the sand settling device through the sand pumping main pipe. Under the shallow sedimentation and vortex sweeping action of the sand settling device, the sand particles settle into the sand hopper at the bottom of the sand settling device and are continuously or intermittently sucked out of the tank body by the sand lifting pump and enter the sand washing and separation device to realize sand-water separation. The overflow sewage of the sand settling device and the return sewage of the sand washing and separation device both enter the buffer water tank and are transported back to the sewage treatment structure by the water pump in the buffer water tank. The sand particles separated by the sand washing and separation are centrally disposed of together with the sand discharged from the grit tank of the sewage treatment plant.

3. The system for removing sand from a sewage pool without stopping water supply according to claim 1, characterized in that: The sand-water separation unit controls the sand removal accuracy according to the particle size distribution characteristics of the sand particles in the sewage treatment plant inlet.

4. The system for removing accumulated sand from a sewage pool without stopping water supply according to claim 1, characterized in that: The electronic control and auxiliary units include a deodorizing device, a water pump frequency conversion control box, and a transport platform; the water pump frequency conversion control box is used to automatically control the functional units; the deodorizing device is used to collect and treat the odor generated by the sand-water separation unit; the transport platform is used for the integrated work of the entire system and the transportation vehicle equipment.

5. The system for removing accumulated sand from a sewage pool without stopping water flow according to any one of claims 1 to 4, characterized in that: When removing accumulated sand without stopping water, the following steps are included: Sand accumulation detection and analysis phase: Detection is conducted inside the sand removal structure to clearly locate the distribution, location, and depth of underwater sand accumulation, detect the relative spatial position of underwater obstacles, conduct three-dimensional modeling, and analyze and count the amount of sand accumulation; Sand cleaning work plan formulation stage: Based on the detection and analysis results, calculate the working time required for sand cleaning and suction, formulate the configuration parameters of the relevant equipment of the sand and water separation unit, and design the underwater sand cleaning work route. The configuration parameters include the specifications of the sand settling device and sand washing and sand separation device, the water pump flow rate, head and operating frequency; Sand extraction stage: carry out sand extraction according to the planned sand removal plan, detect the changes of the underwater sand accumulation surface of the structure in real time, revise the extraction route in real time, and carry out sand settling, sand washing and sand separation work at the same time as sand extraction; Effect evaluation stage: After the sand cleaning work plan is completed, the interior of the structure is probed again and compared with the initial modeling data to evaluate the sand cleaning effect and verify the actual amount of sand removed.

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