Aerated grit chamber capable of sucking sand at fixed point

Abstract

The utility model discloses an aerated grit chamber capable of sucking sand at a fixed point, which comprises a grit chamber body and a grit chamber cover, the fixed-point sand suction system is arranged in the sand setting area and comprises a plurality of sand suction ports formed along the bottom of the sand setting area; the aeration system is arranged in the sand setting area and comprises a plurality of aeration holes which are staggered with the sand suction ports; and the intelligent control system is electrically connected with the fixed-point sand suction system and the aeration system and can adjust fixed-point sand suction and aeration parameters according to real-time monitoring data. According to the scheme, operation parameters can be dynamically adjusted according to changes of inlet water quality and sediment content, energy consumption is reduced, the treatment effect is improved, the system can accurately control the sand-water separation process, and the separation efficiency is improved. Meanwhile, the combination of fixed-point sand suction and local aeration can reduce hydraulic dead angles to the maximum extent, silt is prevented from being locally accumulated, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to sewage treatment tank construction field, especially to a point sand suction aeration grit chamber. BACKGROUND

[0002] Sewage in the process of migration, flow and collection will inevitably mix with mud and sand, and if the mud and sand are not separated in time, it will have a serious impact on the subsequent sewage treatment system, especially the wear and tear of pumps, the blockage of pipe networks and the interference and damage of biochemical treatment process. By reasonably designing the grit chamber, the particles with high density in the sewage can be effectively removed, which can significantly reduce equipment wear and tear, reduce energy consumption, prolong equipment service life and improve system stability and efficiency. At present, the pretreatment process using coarse and fine screens and aeration grit chamber performs stably in actual operation, is suitable for occasions with large water fluctuation and has good oil removal capacity, so it has a wide application prospect in sewage treatment. However, with the increasing demand for sewage treatment, it is inevitable to further optimize the process, improve the sand removal efficiency, reduce energy consumption and improve economic benefits.

[0003] For example, patent application No. CN201821635415.6 discloses a closed point sand suction aeration grit chamber, which comprises a sand collecting groove, a sand water propeller assembly, a point gas lifting device and a self-control system. The sand water propeller assembly comprises a plurality of propellers, each propeller comprises a hoisting frame, a slide support platform and a slide fixed seat, a slide is arranged between the slide support platform and the slide fixed seat, and a sand water propeller that can slide up and down on the slide is arranged on the slide. The self-control system comprises a controller, a sand accumulation detector and a water outlet sand content measuring instrument.

[0004] In the above scheme, there is no reciprocating sand suction pipe on the pool surface, and the pool surface can be fixedly and fully sealed, which solves the problems of difficult deodorization and sealing of the aeration grit chamber and overflow of the odor gas. However, there are still problems of low sand removal efficiency and inability to timely separate the mud and sand in the sewage, so the scheme needs to be optimized. Content of the utility model

[0005] In view of the problems of low sand removal efficiency and high energy consumption of the traditional grit chamber, the present scheme can dynamically adjust the operating parameters according to the changes of the water quality and the sand content, reduce the energy consumption, improve the treatment effect, and the system can accurately control the sand water separation process and improve the separation efficiency. At the same time, the combination of point sand suction and local aeration can maximize the reduction of hydraulic dead angle, avoid the accumulation of mud and sand in the local area, and prolong the service life of the equipment.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A point sand suction aeration grit chamber comprises a grit chamber body, and a grit setting area is arranged in the grit chamber body.

[0008] The point sand suction system is arranged in the sand settling area and comprises a plurality of sand suction ports arranged along the bottom of the sand settling area;

[0009] The aeration system is arranged in the sand settling area and comprises a plurality of aeration holes staggered with the sand suction ports;

[0010] The intelligent control system is electrically connected with the point sand suction system and the aeration system and can adjust the point sand suction and aeration parameters according to real-time monitoring data.

[0011] The aeration sand settling tank with point sand suction in the scheme can realize efficient sand separation through a unique structure. The sand settling area in the body of the sand settling tank is the core working area, and the point sand suction system and the aeration system work cooperatively in the area. The plurality of sand suction ports are distributed along the bottom to ensure comprehensive coverage of the sand settling area. The aeration holes are staggered with the sand suction ports to form local water flow disturbance, which helps to prevent sand deposition. The intelligent control system adjusts the sand suction and aeration parameters through real-time monitoring data to adapt to different working conditions. Compared with the traditional sand settling tank, the scheme can dynamically adjust the operating parameters according to the changes of the water quality and the sand content, reduce energy consumption, improve the treatment effect, and accurately control the sand-water separation process to improve the separation efficiency. At the same time, the combination of point sand suction and local aeration can minimize the hydraulic dead angle and avoid sand accumulation in the local area to prolong the service life of the equipment.

[0012] As a preferred, the point sand suction system comprises: a plurality of independently controlled sand suction pumps connected with the plurality of sand suction ports; a sand suction pipeline connected with the plurality of sand suction pumps; a plurality of electric control valves arranged on the sand suction pipeline; and the plurality of sand suction ports are distributed in a spiral shape along the bottom of the sand settling area. The deposited sand particles are transported to the subsequent processing unit through the sand suction pipeline, and the electric control valves are arranged on the sand suction pipeline to realize accurate control of each sand suction point. The sand suction ports are distributed in a spiral shape along the bottom of the sand settling area to ensure that the sand suction action effectively covers the entire sand settling area and avoids the occurrence of sand deposition dead angle. The sand suction pumps are independently controlled and cooperate with the electric valves to flexibly adjust the sand suction strength and frequency according to the sand deposition conditions of each area, thereby improving the adaptability and energy efficiency of the system. In particular, the spiral layout can also guide the water flow to form a spiral upward flow state, prolong the hydraulic retention time, and improve the sand settling efficiency. The point controllable sand suction mode proposed in the scheme can realize accurate sand suction according to the actual operation condition, reduce energy waste, and improve the sand settling effect.

[0013] Further, the aeration system comprises: a plurality of independently adjustable aeration units, each aeration unit comprising:

[0014] An aeration pipe, a plurality of adjustable aperture aeration holes arranged on the aeration pipe, and a variable frequency blower connected with the aeration pipe. The adjustable aperture aeration holes can change the size of the bubbles according to the needs, adapt to different aeration needs, and the variable frequency blower can adjust the aeration amount and pressure to realize energy consumption optimization. The independently adjustable aeration units cooperate with the intelligent control system to dynamically adjust the aeration parameters according to the real-time conditions such as water quality and sand deposition, improve the flexibility and processing efficiency of the system.

[0015] As a preferred, the bottom of the sand settling zone is multi-stage ladder-shaped, and the inclination angle of each stage is 5°-15°, and the inclination direction is towards the corresponding sand suction port. The inclined ladder structure uses gravity to make the deposited sand particles slide naturally towards the sand suction port, improving the sand suction efficiency. The inclination angle of 5°-15° is obtained through test calculation, which can ensure smooth sliding of sand particles and will not cause water flow disorder. In addition, the multi-stage ladder structure increases the sand settling area, prolongs the hydraulic retention time, improves the sand settling efficiency, and the ladder-shaped structure also reduces the dead angle at the bottom to avoid long-term accumulation of sand particles.

[0016] As a preferred, the intelligent control system includes: a plurality of turbidity sensors and flow rate sensors arranged at different positions and depths in the sand settling zone; a data acquisition module electrically connected with the sensors; a parameter optimization module based on machine learning algorithm, which can dynamically adjust the system operation parameters according to historical operation data and real-time monitoring data. By arranging turbidity sensors and flow rate sensors at different positions and depths in the sand settling zone, the changes of water quality and hydraulic conditions in the sand settling zone can be monitored in real time. The data acquisition module integrates these sensor data to provide comprehensive real-time information for system operation. The parameter optimization module based on machine learning algorithm is the core of the system, which can analyze the correlation between historical operation data and real-time monitoring data, and establish a mathematical model between sand settling efficiency and various operation parameters. This enables the system to automatically adjust key parameters such as sand suction frequency and aeration intensity according to changes in external conditions such as water quality and water quantity, to realize dynamic optimization of sand settling efficiency.

[0017] As a preferred, it also includes: a multi-stage slag scraping device arranged above the sand settling tank body; a staged slag removal system connected with the multi-stage slag scraping device; wherein the multi-stage slag scraping device and the staged slag removal system are electrically connected with the intelligent control system, and can complete the staged removal of different density floating slags. The multi-stage slag scraping device can scrape the floating slags in layers according to their density and distribution position, avoiding the disturbance and secondary suspension of light floating slags caused by traditional single slag scraping method. The staged slag removal system cooperates with the multi-stage slag scraping device to classify and collect and process floating slags of different densities, improving the possibility of resource utilization. The intelligent control system dynamically adjusts the slag scraping frequency and intensity by real-time monitoring of the thickness and density distribution of the floating slag layer, ensuring the removal effect and minimizing energy consumption, and better adapting to water quality fluctuations to improve overall processing efficiency and stability.

[0018] As a preferred, it further comprises: an adaptive water distribution device arranged at the water inlet end of the grit tank body, the adaptive water distribution device comprising a plurality of water distribution holes with adjustable opening degrees; a multi-stage water collecting device arranged at the water outlet end of the grit tank body. The adaptive water distribution device can dynamically adjust the water flow distribution according to the changes of water quality and quantity through the plurality of water distribution holes with adjustable opening degrees, ensure the uniformity of water flow in the grit area, avoid short flow and dead zone, and effectively improve the gritting efficiency, especially in the case of large water quantity fluctuation. The multi-stage water collecting device further optimizes the hydraulic conditions by collecting the outlet water in layers, and reduces the influence of water flow turbulence on the gritting effect. The intelligent control system can automatically adjust the opening degree of the water distribution hole and the height of the water collecting device according to the real-time monitoring data, and realize the precise control of the inlet and outlet water.

[0019] As a preferred, the fixed-point grit suction system further comprises: a sand-water separator; and a sand particle recovery system connected with the sand-water separator; wherein the sand particle recovery system can recover and utilize the separated sand particles according to the particle size. The sand-water separator uses centrifugal force or gravity settling to effectively separate the sand particles in the grit suction pipeline from the water, and the separated sand particles enter the sand particle recovery system for fine classification according to the particle size through screening or hydraulic classification. This grading recovery method allows sand particles of different sizes to be used for different purposes, such as coarse sand for building materials and fine sand for gardening or filter material. At the same time, the separated water can be returned to the grit tank, reducing water resource waste. The intelligent control system can dynamically adjust the separation and recovery parameters according to the inlet sand quantity and particle size distribution to ensure optimal separation effect and resource utilization rate.

[0020] As a preferred, it further comprises: a multi-parameter water quality monitoring system arranged in the grit tank body; and a water quality analysis module connected with the multi-parameter water quality monitoring system; wherein the water quality analysis module can automatically adjust the grit suction and aeration strategy according to real-time water quality data, and predict system maintenance requirements. By adding the multi-parameter water quality monitoring system and the water quality analysis module, precise control and predictive maintenance of the gritting process are realized. The multi-parameter water quality monitoring system arranges multiple sensors in the tank body to monitor key indicators such as pH value, turbidity, and dissolved oxygen in real time. The water quality analysis module processes these real-time data using advanced algorithms, establishes a water quality change model, and compares and analyzes with historical data. Based on these analysis results, the system can automatically adjust parameters such as grit suction frequency and aeration intensity to adapt to water quality fluctuations. For example, when the inlet water turbidity is detected to suddenly increase, the system will immediately increase the grit suction intensity and aeration amount to prevent sand particle accumulation. At the same time, through long-term data accumulation and trend analysis, the water quality analysis module can predict equipment wear and performance decline, and arrange maintenance in advance to avoid unexpected downtime.

[0021] Therefore, the present application has the following beneficial effects:

[0022] The grit chamber realizes precise and efficient grit removal through fixed-point grit suction and an intelligent aeration system, significantly improves gritting efficiency, reduces energy consumption, has strong adaptability, and can cope with various complex water quality conditions.

[0023] The multi-stage stepped bottom cooperates with the spiral distributed grit suction port to optimize the water flow path and gritting area, improve grit settling effect, reduce dead angles and short flow phenomenon, and ensure the overall performance of the grit chamber.

[0024] The intelligent control system combines multi-parameter water quality monitoring to realize real-time optimization and predictive maintenance of the gritting process, effectively improve operation stability, reduce manual operation errors and maintenance costs.

[0025] The sand-water separator and the staged recovery system are used in cooperation to realize resource utilization of grit, reduce waste disposal amount, create more economic value, and meet the concept of circular economy. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic view of the utility model.

[0027] Figure 2 is Figure 1 is a sectional view of A-A.

[0028] 1, grit chamber body; 2, gritting area; 3, grit suction port; 4, aeration hole; 5, grit suction pump; 6, grit suction pipeline; 7, electric control valve; 8, aeration pipe; 9, variable frequency air blower; 10, multi-stage slag removal device; 11, staged slag removal system; 12, stepped grid cleaner; 13, multi-stage water collecting device; 14, sand-water separator. DETAILED DESCRIPTION

[0029] The present application will be further described below in combination with the drawings and specific embodiments.

[0030] Example 1

[0031] As Figure 1 , 2As shown, the grit chamber body 1 is provided with a grit setting area 2, and the grit chamber body 1 is provided with a stepped grid cleaner 12, the bottom of which is multi-step, and the inclination angle of each step is 5-15°, and the inclination direction is towards the corresponding sand suction port 3. The present scheme utilizes gravity to promote sand settling, while avoiding dead angles and short flow phenomena. The fixed-point sand suction system includes a plurality of sand suction ports 3 distributed in a spiral along the bottom of the grit setting area 2, and each sand suction port 3 is connected to a sand suction pipeline 6 through an independently controlled sand suction pump 5 and an electrically controlled valve 7. The spiral distribution ensures comprehensive coverage of the grit setting area 2, and independent control allows precise adjustment of the grit setting conditions in different areas. The aeration system is composed of several independently adjustable aeration units, each unit including an aeration pipe 8, an aeration hole 4 with adjustable aperture, and a variable frequency blower 9. The aeration holes 4 are arranged alternately with the sand suction ports 3, and this layout can provide sufficient oxygen to promote organic matter degradation, and can prevent light organic matter from settling through gas-liquid stirring. The intelligent control system monitors water quality parameters in real time through turbidity sensors and flow rate sensors arranged at different positions and depths in the grit setting area 2. The parameter optimization module based on machine learning algorithm can dynamically adjust the sand suction frequency, aeration intensity and other operating parameters according to historical operation data and real-time monitoring data, realizing adaptive optimization of the system. In addition, the grit chamber is also equipped with a multi-stage slag scraping device 10 and a staged slag removal system 11, which can remove floating slag of different densities in stages. The adaptive water distribution device set at the inlet end includes a plurality of independently adjustable water distribution holes, and the outlet end adopts a multi-stage water collection device 13, which optimizes the hydraulic conditions together. The fixed-point sand suction system also includes a sand-water separator 14 and a sand particle recovery system, which can recover and utilize sand particles according to their particle size. The multi-parameter water quality monitoring system and water quality analysis module further enhance the intelligent level of the system, which can automatically adjust the operation strategy according to real-time water quality data and predict system maintenance needs.

[0032] Specifically, in the aeration grit chamber with fixed-point sand suction provided by the present application, the grit chamber body 1 adopts a reinforced concrete structure, and the interior is provided with a grit setting area 2, the length of which is 15-20 times the width of the inlet, and the width is 3-5 meters. The bottom of the grit setting area 2 is multi-step, and a total of 5-7 steps are provided, each step is about 1.5-2 meters long, the inclination angle is 5-15°, and the inclination direction is towards the corresponding sand suction port 3. The surface of the step is treated with wear-resistant material to ensure that it does not deform during long-term use.

[0033] The fixed-point sand suction system includes a plurality of sand suction ports 3 distributed in a spiral shape along the bottom of the sand settling area 2, with a spacing of 1-1.5 meters. Each sand suction port 3 has a diameter of about 100-150 mm and is made of wear-resistant alloy material, with a grid inside to prevent large particles from entering. The sand suction port 3 is connected to an independently controlled sand suction pump 5 through a DN80 stainless steel pipeline. The pump is a variable frequency speed regulating centrifugal pump with a flow range of 0-50 m³ / h. An electric ball valve is installed every 5 meters on the sand suction pipeline 6 to accurately control the sand suction area. The spiral distribution of the sand suction ports 3 is arranged in 1.5 circles from the center of the pool body outward, ensuring full coverage of the sand settling area 2.

[0034] The aeration system is composed of 6-8 independently adjustable aeration units, each covering an area of about 20-25 m². The aeration unit includes a main pipe (DN100) and several branch pipes (DN50), made of 316L stainless steel. An adjustable aperture aeration hole 4 (diameter 2-5 mm) is installed every 0.5 meters on the branch pipe, and the aperture can be adjusted by an electric fine adjustment device to achieve an accuracy of 0.1 mm. Each aeration unit is connected to a variable frequency air blower 9 (air volume 0-1000 m³ / h) through a DN80 pipeline. The aeration holes 4 and the sand suction ports 3 are arranged in a staggered manner in the plane, with a vertical distance of 0.3-0.5 meters. This three-dimensional staggered layout can not only provide sufficient oxygen to promote organic matter degradation, but also prevent lightweight organic matter from settling through gas-liquid stirring.

[0035] The intelligent control system adopts a distributed control architecture, with 12-15 turbidity sensors and 8-10 flow rate sensors installed at different positions and depths in the sand settling area 2. The sensors are connected to the data acquisition module through 4-20 mA signals, with a sampling frequency of up to 10 Hz. The parameter optimization module based on deep learning runs on an industrial-grade edge computing device with an 8-core CPU and 16 GB of memory, which can process massive sensor data in real time. This module can dynamically adjust the sand suction frequency, aeration intensity and other operating parameters every 5 minutes based on historical operation data and real-time monitoring data, achieving adaptive optimization of the system.

[0036] In addition, a three-stage chain plate type slag scraping device is installed on the top of the sand settling tank, with a scraping width of 1.5 meters per stage. The speed can be adjusted within the range of 0.1-0.5 m / min through a variable speed motor. The slag scraping device is connected to a staged slag discharge system 11, which includes three floating slag collection tanks with a volume of 2 m³, which can be collected according to the density of the floating slag. The adaptive water distribution device at the inlet end is composed of 5-7 electrically adjustable gates, each gate is 0.5-0.8 meters wide, and the opening can be adjusted steplessly within the range of 0-100%. The outlet end adopts a three-stage water collection tank design, with a length of 1 / 3 of the pool width, and the treated water is collected step by step through overflow.

[0037] The fixed-point sand suction system also includes a cyclone sand-water separator with a processing capacity of 50 m³ / h, and the separation efficiency can reach 95%. The separated sand particles are transported to the sand particle recovery system by a screw conveyor, including a three-stage vibrating screen mesh (pore sizes of 2 mm, 1 mm, and 0.5 mm), which can divide the sand particles into four grades for recycling.

[0038] The multi-parameter water quality monitoring system is equipped with one set of online monitoring equipment at each of the pool inlet and outlet, which can simultaneously monitor more than 10 indicators such as pH, COD, ammonia nitrogen, and total phosphorus. The water quality analysis module is based on artificial intelligence algorithms and can analyze the water quality trend in real time, predict the water quality change within 24 hours, and automatically adjust the operation strategy accordingly. At the same time, the module can also predict the system maintenance needs by analyzing equipment vibration, energy consumption, and other data, and issue a maintenance warning 3-5 days in advance.

[0039] The above-mentioned aeration grit chamber with fixed-point sand suction has the following operation process and use scheme:

[0040] First, before the system starts, the grit chamber needs to be cleaned and inspected to ensure that all equipment is in normal working condition. Start the intelligent control system, the system will automatically perform self-checking and initialization. Then, open the inlet gate, and sewage starts to enter the grit chamber. The self-adaptive water distribution device will automatically adjust the opening of 5-7 electric regulating gates according to the water quality and flow rate of the inlet water to ensure uniform distribution of the water flow.

[0041] As the sewage enters the grit chamber 2, the multi-parameter water quality monitoring system starts to monitor the inlet water quality in real time, including pH, COD, ammonia nitrogen, total phosphorus, and other indicators. The intelligent control system sets the aeration intensity and sand suction frequency based on the monitoring data and historical operation experience. The aeration system starts to work, and the 6-8 aeration units start to work. The frequency conversion blower 9 adjusts the air volume according to the set parameters, and the air is delivered to the water through the adjustable aperture aeration holes 4. This process not only provides oxygen for microorganisms but also prevents the settlement of light organic matter through gas-liquid stirring.

[0042] At the same time, the fixed-point sand suction system starts to work. The spiral-shaped distribution of the sand suction port 3 starts to work according to the preset program, and the frequency conversion speed regulating centrifugal pump controls the sand suction intensity. The electric ball valve is opened or closed as needed to accurately control the sand suction area. The sand-water mixture sucked out enters the cyclone sand-water separator, and the separated sand particles are transported to the sand particle recovery system by a screw conveyor and are classified and recycled by a three-stage vibrating screen mesh.

[0043] During operation, the intelligent control system continuously receives data from 12-15 turbidity sensors and 8-10 flow rate sensors. The parameter optimization module based on deep learning dynamically adjusts the operating parameters every 5 minutes, including adjusting the diameter of the aeration holes 4, changing the air volume of the blower, adjusting the flow rate of the sand suction pump 5, etc. This real-time optimization ensures that the system can adapt to changes in water quality and quantity, maintaining optimal treatment effects.

[0044] The three-stage chain plate type slag scraping device at the top of the tank body automatically adjusts the running speed (0.1-0.5 m / min) according to the accumulation of floating slag, and scrapes the floating slag of different densities into the corresponding floating slag collection tank. The staged slag discharge system 11 performs subsequent treatment or recycling according to the characteristics of the floating slag.

[0045] The treated water is collected step by step through the three-stage water collection tank, ensuring stable effluent water quality. The multi-parameter water quality monitoring system monitors the effluent in real time, and the water quality analysis module predicts the water quality trend within 24 hours based on artificial intelligence algorithms, and adjusts the operation strategy in advance accordingly.

[0046] In production applications, this embodiment can effectively handle the mixed treatment of industrial wastewater and domestic sewage. For example, in a wastewater treatment plant in a textile industrial park, facing water with large pH fluctuations and high organic load, the system can maintain stable treatment effects by adjusting the aeration intensity and sand suction frequency in real time. For wastewater with high salt content in coastal areas, consider replacing some of the pipelines and valves with corrosion-resistant materials to extend the service life of the equipment. When treating wastewater with high sand content in mining areas, a pre-sedimentation tank can be added to reduce the load on the main system.

[0047] Through long-term operation data analysis, this scheme can achieve a sand particle removal rate of more than 95% under standard working conditions (influent SS 200-300 mg / L, sand content 50-80 mL / L), while the COD removal rate can reach 15-20%. The energy consumption of the system is reduced by about 30% compared to traditional grit chambers, and the maintenance cycle is extended by 50%. These performance indicators make this technology have a significant advantage in wastewater treatment plant upgrading and new project construction.

[0048] Embodiment 2

[0049] Compared to Embodiment 1, this embodiment proposes an innovative multifunctional fixed-point sand suction aeration grit chamber system. By optimizing the hydraulic conditions and introducing intelligent control technology, it realizes efficient sand particle removal, organic matter degradation, and grease separation. This embodiment consists of two parallel rectangular grit chamber units, each with a length of 12-18 meters, a width of 3-4 meters, and a water depth of 3.5-4.5 meters. The bottom adopts a double-V structure with a central ridge and a slope of 6-10 degrees on both sides, forming a sand collection channel. Each unit is divided into four functional areas: an inlet uniform flow area, a main grit settling area 2, a grease separation area, and an effluent purification area, with a ratio of about 1:5:2:2.

[0050] A series of adjustable angle guide plates with a spacing of 0.6-1 meter are arranged in the water inlet uniform flow area for energy dissipation and uniform distribution of water flow. The main sand settling area 2 adopts an innovative "honeycomb type" water flow distribution structure, which forms a micro-scale directional flow field by installing multiple groups of hexagonal partition arrays in the pool body. This structure not only increases the water flow path and prolongs the residence time, but also creates a local low-speed area, which is beneficial to the settlement of fine sand particles. The hexagonal partition is made of high-strength composite material and coated with a self-cleaning nano coating on the surface to reduce organic matter accumulation and biofilm attachment.

[0051] The aeration system adopts a zoning variable frequency control strategy, dynamically adjusting the aeration intensity according to the needs of different functional areas. In the main sand settling area 2, multiple rows of micro-porous aeration pipes 8 with a pore size of 0.3-0.8 millimeters are installed at the bottom, which adopt a special telescopic diaphragm structure that can automatically adjust the opening according to the air pressure to ensure uniform distribution of air bubbles. The aeration intensity can be adjusted steplessly in the range of 0.6-2.5 cubic meters / (square meter·hour), and the air-water ratio is accurately controlled at 0.9-1.3. The water inlet uniform flow area and the water outlet purification area use medium pore aeration, mainly for preventing sedimentation and providing preliminary stirring. The oil separation area is provided with surface aeration devices to generate fine bubbles to promote oil floating.

[0052] The innovative sand particle collection system uses intelligent fixed-point sand suction technology. Multiple sand suction ports 3 with a diameter of 40-70 millimeters and a spacing of 1.2-1.8 meters are arranged at the bottom of the double-V-shaped pool. Each sand suction port 3 is connected to an independent air-lift pipe, which realizes intermittent sand particle transportation through pulse-type compressed air injection. The air-lift pipe adopts a special spiral inner groove structure to reduce wear and improve transportation efficiency. The intelligent control system automatically adjusts the operation frequency and duration of each sand suction point according to the real-time monitoring of sand accumulation, achieving precise sand cleaning.

[0053] The system integrates advanced multi-parameter online monitoring equipment, including high-precision laser particle size analyzers, oil concentration sensors, and organic matter rapid detectors. These data are transmitted in real time to the central control system for data analysis and prediction through deep learning algorithms to optimize operating parameters. The control system uses fuzzy PID control strategy to adjust the aeration intensity, sand suction frequency, and hydraulic retention time in real time according to the fluctuations in the water quality and treatment effect, ensuring that the system always operates in the best state.

[0054] To improve the oil removal efficiency, a gas flotation coagulation device is installed in the oil separation area. A large number of micro-bubbles with a diameter of 20-50 microns are generated by a micro-nano bubble generator, and high-efficiency organic flocculants are added to promote oil droplet aggregation and floating. The floating oil is collected by an adjustable overflow weir and enters an oil-water separator for further treatment.

[0055] Compared with traditional grit chamber, the embodiment has the following advantages: 1) high processing efficiency, the sand removal rate can reach more than 98%, and the removal rate of 30-80 μm fine sand can reach 90%; 2) low energy consumption, through intelligent partition aeration and optimization of hydraulic conditions, the energy consumption is reduced by 35-40% compared with traditional design; 3) strong adaptability, the "honeycomb type" flow field and intelligent control system enhance the adaptability of the system to water quality and quantity fluctuations; 4) simple maintenance, the intelligent fixed-point sand suction system greatly reduces the need for manual maintenance, and the maintenance cycle is extended by 80%; 5) strong comprehensive treatment capacity, good sand removal effect, and high efficient organic matter removal and grease retention capacity.

[0056] Theoretical analysis and pilot data show that under standard working conditions (influent SS 350-450 mg / L, sand content 100-150 mL / L, COD 300-400 mg / L), the system can achieve the following performance indicators: sand removal rate ≥98%, COD removal rate 25-30%, and grease removal rate ≥80%. The hydraulic retention time is 2.5-4 minutes, which is 30-40% shorter than traditional design. The energy consumption of the system is reduced by about 35-40% compared with traditional aerated grit chamber, and the occupied area is reduced by 25-30%. Through the "honeycomb type" flow field, a large number of micro low-speed areas are utilized to effectively reduce the critical particle size and improve the fine sand removal efficiency.

[0057] The embodiment is particularly suitable for treating complex industrial wastewater with high sand content, high organic load and high grease content. For example, in the mixed industrial area of food processing, petroleum chemical industry and textile printing and dyeing, the system can simultaneously treat complex wastewater with high sand content, high organic matter and high grease. By adjusting the structural parameters of the "honeycomb type" flow field and the algorithm of the intelligent control system, the system can also flexibly respond to seasonal changes and sudden pollution events of the influent water quality.

[0058] In practical application, the system can also be optimized according to specific needs. For example, for wastewater containing refractory organic matter, a high-level oxidation unit such as ozone or UV photocatalytic device can be integrated in the effluent purification zone to further improve the treatment effect. In addition, the modular design of the system allows flexible combination of different functional units according to actual treatment needs, such as adding phosphorus removal unit or heavy metal adsorption unit, to realize the synergistic removal of multiple pollutants.

[0059] The multifunctional fixed-point sand suction aerated grit chamber system proposed in the embodiment realizes efficient synergy of sand removal, organic matter degradation and grease separation through innovative hydraulic design, intelligent control strategy and integration of diversified treatment units, and provides a solution with high efficiency, economy and flexibility for complex industrial wastewater treatment.

Claims

1. A point-sandable grit chamber, characterized in that, The utility model relates to a sand trap, which comprises: a sand trap body, wherein a sand setting area is arranged in the sand trap body; a fixed-point sand suction system arranged in the sand setting area, comprising a plurality of sand suction ports arranged along the bottom of the sand setting area; an aeration system arranged in the sand setting area, comprising a plurality of aeration holes staggered with the sand suction ports; an intelligent control system electrically connected with the fixed-point sand suction system and the aeration system, capable of adjusting the fixed-point sand suction and aeration parameters according to real-time monitoring data.

2. The aerated grit chamber according to claim 1, wherein The fixed-point sand suction system comprises: a plurality of independently controlled sand suction pumps connected with the sand suction ports; a sand suction pipeline connected with the sand suction pumps; a plurality of electrically controlled valves arranged on the sand suction pipeline; the sand suction ports are arranged in a spiral manner along the bottom of the sand setting area.

3. The aerated grit chamber according to claim 1, wherein The aeration system comprises a plurality of independently adjustable aeration units, each aeration unit comprising: an aeration pipe; a plurality of aeration holes with adjustable aperture arranged on the aeration pipe; a variable frequency air blower connected with the aeration pipe.

4. The aerated grit chamber according to claim 1, wherein The bottom of the sand setting area is in a multi-stage ladder shape, and the inclination angle of each stage is 5°-15°, and the inclination direction is towards the corresponding sand suction port.

5. The aerated grit chamber according to claim 1, wherein, The intelligent control system comprises: a plurality of turbidity sensors and flow rate sensors arranged at different positions and depths in the sand setting area; a data acquisition module electrically connected with the sensors; a parameter optimization module based on a machine learning algorithm, capable of dynamically adjusting system operation parameters according to historical operation data and real-time monitoring data.

6. The aerated grit chamber according to any one of claims 1 to 5, wherein Further comprising: a multi-stage slag scraping device arranged above the sand trap body; a staged slag removal system connected with the multi-stage slag scraping device; wherein the multi-stage slag scraping device and the staged slag removal system are electrically connected with the intelligent control system, and can complete the staged removal of slags with different densities.

7. The aerated grit chamber according to any one of claims 1 to 5, wherein Further comprising: an adaptive water distribution device arranged at the water inlet end of the sand trap body, the adaptive water distribution device comprising a plurality of water distribution holes with independently adjustable opening degrees; a multi-stage water collection device arranged at the water outlet end of the sand trap body.

8. The aerated grit chamber according to any one of claims 1 to 5, wherein The fixed-point sand suction system further comprises: a sand-water separator; a sand particle recovery system connected with the sand-water separator; wherein the sand particle recovery system can perform staged recycling according to the particle size of separated sand particles.

9. The aerated grit chamber according to claim 1, wherein, Further comprising: a multi-parameter water quality monitoring system arranged in the sand trap body; a water quality analysis module connected with the multi-parameter water quality monitoring system; wherein the water quality analysis module can automatically adjust the sand suction and aeration strategies according to real-time water quality data, and predict system maintenance requirements.

Images