System for discharging accumulated sand in sewage pool without cutting off water supply

Abstract

The invention discloses a system for removing accumulated sand in a sewage pool without cutting off water, and belongs to the technical field of sewage treatment normalized operation and maintenance sand removal. Comprising a central processing unit, and the central processing unit is connected with a detection analysis unit, an accumulated sand suction unit, a sand-water separation unit and an electric control and accessory unit; the detection analysis unit is used for scanning a sewage pool by using a multi-beam sonar, acquiring high-density point cloud data in real time, and removing noise points caused by water bubbles and suspended solids by adopting dynamic threshold filtering; the accumulated sand suction unit is used for sucking accumulated sand and discharging the accumulated sand to the sand-water separation unit; the sand-water separation unit is used for separating sand grains and sewage; and the electric control and accessory unit is used for automatically regulating and controlling the functional unit and treating wastes generated by the functional unit. Sand cleaning operation can be directly carried out on the water treatment structure without emptying the pool body, normal operation of the biochemical pool is not affected in the sand cleaning process, the influence of emptying and pool cleaning on production is avoided, and the operation cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sand removal in normalized operation and maintenance of sewage treatment, and in particular to a system for removing accumulated sand from a sewage pool without stopping water. Background Art

[0002] my country's drainage network is affected by many factors such as construction quality and operation management, resulting in the common problems of low organic matter concentration and high sand content in the influent of urban sewage treatment plants. Most sewage treatment plants choose to cancel the primary sedimentation tank to reduce the loss of carbon sources in sewage, and rely on the grit chamber as the main measure to remove inorganic sand particles in the influent. The "Outdoor Drainage Design Standard" (GB50014-2021) stipulates that a grit chamber should be set up for sewage treatment, and the grit chamber 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 temporal and spatial differences in the sand content and particle size distribution of sewage in different cities. The existing standards lack universality for the sand content characteristics of urban sewage under different characteristic conditions, and cannot meet the sand content characteristics of the influent of different sewage treatment plants. The actual sand removal effect is not ideal. Relevant researchers conducted a one-year survey of the influent water quality of five sewage treatment plants in Jinan City and a survey of 10 grit chambers and found that the actual daily sand removal capacity of the grit chamber was only 10% of the theoretical value.

[0003] Other researchers conducted a survey and analysis on the sand removal of grit chambers in six sewage treatment plants in different cities in China. The weighted average sand removal rate of the aerated grit chamber and the Bischof cyclone grit chamber, which are currently more commonly used, is as high as 52%, and the lowest is less than 10%. A large amount of sand entering the subsequent sewage treatment system will accelerate the wear of equipment such as pumps and propellers. Smaller sand particles are easily entrained by activated sludge and eventually enter the sludge treatment system, reducing the proportion of organic matter in the sludge and increasing the difficulty of disposal.

[0004] On the other hand, the sand particles with larger particle sizes that enter the biochemical system are prone to siltation at the bottom of the structure where the mixing flow rate is insufficient or the flow is blocked, occupying the pool space, resulting in a reduction in the effective pool volume, reducing the treatment efficiency of the biochemical pool, and increasing the operating energy consumption. The long-term siltation of sand particles will also cause anaerobic gas production and other phenomena on the attached organic matter, increasing the carbon emissions of the sewage treatment process. Therefore, the sewage treatment plant needs to regularly remove the accumulated sand in the treatment structure. At present, the treatment method for the accumulated sand in the sewage pool is generally to stop the water regularly, empty the pool, and manually clean it according to experience, or use a suction truck to suck it. These methods have the following shortcomings: 1. Since the sand accumulation in the sewage treatment pool cannot generally be directly identified by vision, the amount of sand accumulation, the distribution of sand accumulation, and the dredging cycle can only be estimated based on experience. 2. The use of manual cleaning requires the water outage of the treatment structure and the emptying of the pool, which will affect normal production during the water outage and cleaning period. The water outage and cleaning are generally arranged in the season with low sewage treatment volume, otherwise it will be difficult to cope with the unexpected impact of increased sand volume in the flood season. 3. The manual cleaning of sewage treatment pools is labor-intensive, with poor sanitary conditions and exposure to toxic and harmful gases. The operating environment is harsh and poses a great risk to personnel safety. 4. If the pool is not emptied, it is difficult to achieve the required cleaning effect when using a suction truck. Emptying the pool will also affect production, and the accumulated sand sucked out has high moisture and organic content, which requires separate treatment and disposal.

[0005] At present, the dredging industry has some other methods for desilting river and lake bottom mud, but they are still not applicable for use in facilities such as sewage treatment structures. This is mainly reflected in the following aspects: the suction device cannot be applied to the refined operation requirements when a large number of underwater facilities and equipment are installed in the sewage treatment structure, which may cause damage to the underwater facilities and equipment; the separation accuracy of the sand and water separation of the extracted mud and sand cannot meet the standard requirements of the sewage treatment system; the equipment integration of the dredging facilities cannot meet the mobile operation requirements under the restricted conditions of the sewage plant area; it is not suitable for the complex conditions of gas, liquid and solid phases in the water operation of the sewage treatment structure and the effective identification of underwater three-dimensional space obstacles.

[0006] In summary, sewage treatment structures need to pump out accumulated sand without stopping the water. This requires accurate identification of the three-dimensional space with complex underwater conditions, refinement of the pumping and dredging operations, and high-precision separation of sand and water. At the same time, it is also necessary to meet the needs of mobile operations in confined space conditions. Summary of the invention

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

[0008] The objective of the present invention is achieved through the following technical solutions: a system for removing accumulated sand from a sewage pool without stopping the water supply, comprising a central processing unit, wherein the central processing unit is connected to a detection and analysis unit, a sand suction unit, a sand-water separation unit, an electronic control and ancillary units; 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 water bubbles and suspended matter; 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 particles and sewage; the electronic control and ancillary units are used to automatically control the functional units and process the waste generated by the functional units.

[0009] Preferably, the detection and analysis unit includes a three-dimensional scanning device, a feedback analysis and processing module, and an intelligent three-dimensional modeling module; When conducting detection and analysis, in the environmental optimization feature extraction layer of the sewage pool, the fixed targets are labeled as point clouds, and the identified equipment point clouds are automatically aligned with the preset BIM model library to generate a three-dimensional model of the pool body and equipment; the moving least squares method is used to generate a sand surface model, and the sand volume is calculated by voxelized grid integration; the three-dimensional model and data are displayed through WebGL or Unity, and cross-section analysis and dynamic rendering of sand thickness heat maps are performed.

[0010] Preferably, the accumulated sand suction unit comprises a water suction and sand suction head, a sand suction main pipe, and a sand suction pump; When the accumulated sand is sucked out, the sand pump sucks to form 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 draws 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 at the set frequency to maintain a stable suction flow.

[0011] Preferably, the sand-water separation unit comprises a buffer water tank, a sand settling device, a sand lifting pump, and a sand washing and separation device; When separating sand and water, the sand and water mixture pumped out 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 accumulation hopper at the bottom of the sand settling device and are continuously or intermittently pumped out of the tank body by the sand lifting pump and enter the sand washing and sand separation device to realize sand and water separation. The overflow sewage from the sand settling device and the return sewage from the sand washing and sand 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 sand separation are centrally disposed of together with the sand discharged from the sand settling tank of the sewage treatment plant.

[0012] Preferably, the sand-water separation unit controls the sand removal accuracy according to the particle size distribution characteristics of the influent sand of the sewage treatment plant.

[0013] Preferably, the electronic control and accessory units include a deodorizing device, a water pump frequency conversion control box, and a transportation platform; the water pump frequency conversion control box is used to automatically control the functional units; the deodorizing device is used to collect and process the odor generated by the sand-water separation unit; the transportation platform is used for the integrated work of the entire system and the transportation vehicle equipment.

[0014] Preferably, the process of removing the accumulated sand without stopping the water includes the following steps: During the sand accumulation detection and analysis phase of the structure, the interior of the sand removal structure is detected 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; During the sand cleaning work plan formulation stage, the detection and analysis results are combined to calculate the working time required for sand cleaning and suction, formulate the configuration parameters of the relevant equipment of the sand-water separation unit, and design the underwater sand cleaning work route. The configuration parameters include the specifications of the sand settling device and the sand washing and separation device, the water pump flow head and working frequency; During the sand extraction phase, the sand extraction work is carried out according to the proposed sand removal work plan, and the changes in the underwater sand accumulation surface of the structure are detected in real time, and the extraction route is revised in real time. While the sand is being extracted, sand settling, sand washing and sand separation work are carried out; During the 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.

[0015] The beneficial effects of the present invention are: 1) For water treatment structures, the tank body does not need to be emptied, and sand cleaning operations can be carried out directly. The sand cleaning process does not affect the normal operation of the biochemical pool, avoids the impact of emptying and cleaning the pool on production, and can reduce operating costs.

[0016] 2) The sand cleaning process does not require workers to go down to the bottom of the pool, but can be operated directly on the pool surface, which basically avoids direct contact between workers in the pool and sludge and possible toxic and harmful gas hazards, greatly reducing personnel safety risks.

[0017] 3) Through precise detection and intelligent modeling, an underwater three-dimensional space map is constructed, which can achieve precise positioning and suction, avoid collisions between the operation process and underwater facilities and equipment, and greatly improve processing efficiency.

[0018] 4) The system can simultaneously clean the extracted sand and water mixture and separate the sand and water with high precision, and the sewage will flow back to the treatment system. The sand particles that separate the organic matter and filter out the water can be directly disposed of together with the sand removal in the sewage treatment plant settling tank, reducing the additional treatment cost.

[0019] 5) It can accurately identify the changes in the amount of sand accumulated before and after the operation, and realize the quantitative evaluation of the operation effect.

[0020] 6) The invention is not only applicable to sewage treatment structures, but also to other similar pools or water bodies for suction and sand removal of accumulated sludge and sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Block diagram of a system for removing sand from a sewage pool without stopping the water flow; Figure 2 This is a schematic diagram of the water suction and sand extraction head structure; Figure 3 System workflow diagram for removing sand from sewage pool without stopping water; In the figure, 1. Sand extraction main pipe joint; 2. Sand extraction cover; 3. Water diversion pipe. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-Figure 3 The present invention provides a technical solution: a system for removing accumulated sand from a sewage pool without stopping the water flow, comprising a central processing unit, wherein the central processing unit is connected to a detection and analysis unit, a sand suction unit, a sand-water separation unit, an electric control and ancillary units; the detection and analysis unit is used to use a multi-beam sonar to scan the sewage pool, 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 the 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 electric control and ancillary units are used to automatically control the functional units and process the waste generated by the functional units.

[0024] In this embodiment, high-density point cloud data can acquire 10,000+ points per second. The system proposed by the present invention is suitable for accurately extracting sand accumulated at the bottom of water treatment structures in sewage treatment plants without emptying the water tanks or stopping production, and separating the sucked sand and water mixture according to the sand removal requirements of sewage treatment. The sewage after sand removal is returned to the treatment system, and the sand is transported out for disposal, which helps sewage treatment plants reduce operating costs and reduce carbon emissions from sewage treatment. The present invention can carry out sand cleaning work on the bottom of the pool when the sewage treatment structure is in normal operation, realize underwater detection, accurately locate the water-absorbed sand, and synchronously wash and separate the sand; the detection and analysis unit of the present invention is aimed at underwater detection in a complex environment of gas, liquid and solid phases, and adopts sonar technology + image recognition technology to perform real-time real-scene three-dimensional modeling with an error of ±1cm; it can realize instant scanning and real-time positioning during the sand pumping operation, and synchronously realize the synchronous correction of the three-dimensional model of the solid-liquid interface of the pool body; the sand-water separation unit of the present invention uses the cyclone principle to synchronously realize cyclone sand settling, cyclone cleaning and separation of sand and organic matter, and spiral sand separation for the sucked sand and water mixture, and the separation accuracy of cyclone sand settling can reach a sand removal rate of ≧85% with a specific gravity of ≧2.65 and a particle size of ≧0.075mm, a sand recovery rate of >90% for sand washing and separation, and a discharged sand organic matter content of ≦15% and a water content of <40%.

[0025] In some embodiments, the detection and analysis unit includes a three-dimensional scanning device, a feedback analysis processing module, and an intelligent three-dimensional modeling module; When conducting detection and analysis, in the environmental optimization feature extraction layer of the sewage pool, the fixed targets are labeled as point clouds, and the identified equipment point clouds are automatically aligned with the preset BIM model library to generate a three-dimensional model of the pool body and equipment; the moving least squares method is used to generate a sand surface model, and the sand volume is calculated by voxelized grid integration; the three-dimensional model and data are displayed through WebGL or Unity, and cross-section analysis and dynamic rendering of sand thickness heat maps are performed.

[0026] In this embodiment, the detection and analysis unit uses a multi-beam sonar to scan the sewage pool, obtains high-density point cloud data (10,000+ points per second) in real time, and uses dynamic threshold filtering to remove noise points caused by bubbles and suspended matter in the water. The feature extraction layer is optimized for the sewage pool environment, and the point clouds of fixed targets such as the pool wall, pipes, and pumps are labeled. The identified equipment point clouds are automatically aligned with the preset BIM model library (such as the pool body, sewage pump, and valve) to generate a three-dimensional model of fixed targets such as the pool body and equipment. The moving least squares method (MLS) is used to generate a sand settling surface model, and the sand settling volume is calculated by voxelized grid integration. The three-dimensional model and data are displayed through tools such as WebGL or Unity, supporting multi-view viewing, profile analysis, and dynamic rendering of sand thickness heat maps.

[0027] In some embodiments, the accumulated sand suction unit comprises a water suction sand suction head, a sand suction main pipe, and a sand suction pump; When the accumulated sand is sucked out, the sand pump forms a negative pressure in the sand pumping main pipe. When the sand pumping cover 2 of the water suction sand pumping head is inserted into the sand accumulation surface, the water diversion pipe 3 of the water suction sand pumping head drains the sewage in the pool from top to bottom and finally enters the sand pumping main pipe under the drive of the negative pressure. 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 3 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 2, thereby enhancing the fluidization and lifting effect of the accumulated sand; during the suction process, the sand pump works at the set frequency to maintain a stable suction flow.

[0028] In this embodiment, the water suction and sand extraction head is provided with four water diversion pipes 3, which, under the action of the suction negative pressure, divert the sewage in the water pool above the sand accumulation layer downward into the sand extraction cover 2 and enter the sand extraction main pipe, and form a local vortex in the sand extraction cover 2 to impact the sand accumulation layer, so that the accumulated sand is fluidized and enters the sand extraction main pipe with the water flow and is discharged to the sand-water separation unit. The end of the sand extraction head has the function of penetrating and loosening the compacted sand layer. The outlet at the lower end of the water diversion pipe 3 has a certain curvature and forms an annular deflection angle with the axial direction of the sand extraction main pipe, which helps the water flow to form a vortex in the sand extraction cover and enhance the effect of fluidization and lifting of the accumulated sand.

[0029] In some embodiments, the sand-water separation unit includes a buffer water tank, a sand settling device, a sand lifting pump, and a sand washing and separation device; When separating sand and water, the sand and water mixture pumped out 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 accumulation hopper at the bottom of the sand settling device and are continuously or intermittently pumped out of the tank body by the sand lifting pump and enter the sand washing and sand separation device to realize sand and water separation. The overflow sewage from the sand settling device and the return sewage from the sand washing and sand 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 sand separation are centrally disposed of together with the sand discharged from the sand settling tank of the sewage treatment plant.

[0030] In this embodiment, the sand-water mixture extracted by the sand suction unit is discharged into the sand settling device through the sand suction 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 pump to enter the sand washing and sand separation device to achieve the final sand and water separation. The overflow sewage of the sand settling device and the return sewage of the sand washing and sand separation device both enter the buffer water tank and are transported back to the sewage treatment structure by the water pump in the water tank. The sand particles separated by the sand washing and sand separation are centrally disposed together with the sand discharged from the sand settling tank of the sewage treatment plant. The sand-water separation unit can control the sand removal accuracy according to the particle size distribution characteristics of the sand particles in the sewage treatment plant. The design accuracy can reach a sand removal rate of ≥85% with a specific gravity of ≥2.65 and a particle size of ≥0.075mm, and an organic matter content of ≤15% and a water content of <40%.

[0031] In some embodiments, 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.

[0032] In some embodiments, the electronic control and auxiliary units include a deodorization device, a water pump frequency conversion control box, and a transportation platform; the water pump frequency conversion control box is used to automatically control the functional units; the deodorization device is used to collect and process the odor generated by the sand and water separation unit; the transportation platform is used for the integrated work of the entire system and the transportation vehicle equipment.

[0033] In this embodiment, the water pump frequency conversion control box realizes the automatic regulation of the sand pump and the return sewage pump. The deodorization device collects and treats the odor generated by the sand and water separation unit to achieve tail gas emission that meets the standards. The transportation platform is a vehicle equipment used for the integrated work and transportation of the whole system.

[0034] In some embodiments, the process of removing accumulated sand without stopping water includes the following steps: During the sand accumulation detection and analysis phase of the structure, the interior of the sand removal structure is detected 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; During the sand cleaning work plan formulation stage, the detection and analysis results are combined to calculate the working time required for sand cleaning and suction, formulate the configuration parameters of the relevant equipment of the sand-water separation unit, and design the underwater sand cleaning work route. The configuration parameters include the specifications of the sand settling device and the sand washing and separation device, the water pump flow head and working frequency; During the sand extraction phase, the sand extraction work is carried out according to the proposed sand removal work plan, and the changes in the underwater sand accumulation surface of the structure are detected in real time, and the extraction route is revised in real time. While the sand is being extracted, sand settling, sand washing and sand separation work are carried out; During the 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.

[0035] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and 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 through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A system for removing sand from a sewage pool without stopping the water flow, characterized in that: It includes a central processing unit, which is connected to a detection and analysis unit, a sand suction unit, a sand-water separation unit, an electric 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 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 accessory units are used to automatically control the functional units and process waste generated by the functional units.

2. The system for removing sand from a sewage pool without stopping water according to claim 1, characterized in that: The detection and analysis unit includes a three-dimensional scanning device, a feedback analysis and processing module, and an intelligent three-dimensional modeling module; When conducting detection and analysis, in the environmental optimization feature extraction layer of the sewage pool, the fixed targets are labeled as point clouds, and the identified equipment point clouds are automatically aligned with the preset BIM model library to generate a three-dimensional model of the pool body and equipment; the moving least squares method is used to generate a sand surface model, and the sand volume is calculated by voxelized grid integration; the three-dimensional model and data are displayed through WebGL or Unity, and cross-section analysis and dynamic rendering of sand thickness heat maps are performed.

3. The system for removing sand from a sewage pool without stopping water according to claim 1, characterized in that: The sand suction unit comprises a water suction sand suction head, a sand suction main pipe and a sand suction pump; When the accumulated sand is sucked out, the sand pump sucks to form 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 draws 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 at the set frequency to maintain a stable suction flow.

4. The system for removing sand from a sewage pool without stopping water according to claim 1, characterized in that: The sand-water separation unit comprises a buffer water tank, a sand settling device, a sand lifting pump, and a sand washing and separation device; When separating sand and water, the sand and water mixture pumped out 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 accumulation hopper at the bottom of the sand settling device and are continuously or intermittently pumped out of the tank body by the sand lifting pump and enter the sand washing and sand separation device to realize sand and water separation. The overflow sewage from the sand settling device and the return sewage from the sand washing and sand 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 sand separation are centrally disposed of together with the sand discharged from the sand settling tank of the sewage treatment plant.

5. The system for removing sand from a sewage pool without stopping water 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.

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

7. The system for removing sand from a sewage pool without stopping the water flow according to any one of claims 1 to 6, characterized in that: When removing the accumulated sand without stopping the water, the following steps are included: During the sand accumulation detection and analysis phase of the structure, the interior of the sand removal structure is detected 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; During the sand cleaning work plan formulation stage, the detection and analysis results are combined to calculate the working time required for sand cleaning and suction, formulate the configuration parameters of the relevant equipment of the sand-water separation unit, and design the underwater sand cleaning work route. The configuration parameters include the specifications of the sand settling device and the sand washing and separation device, the water pump flow head and working frequency; During the sand extraction phase, the sand extraction work is carried out according to the proposed sand removal work plan, and the changes in the underwater sand accumulation surface of the structure are detected in real time, and the extraction route is revised in real time. While the sand is being extracted, sand settling, sand washing and sand separation work are carried out; During the 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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