Aerated grit chamber with high sand discharge efficiency

Abstract

The application provides an efficient sand discharging aeration grit chamber, and relates to the technical field of sewage treatment, which comprises a sand collecting hopper, a bottom sand discharging pipe arranged in the sand collecting hopper, and the bottom sand discharging pipe being arranged along the length direction of the sand collecting hopper, wherein the bottom sand discharging pipe is arranged as a semi-circular pipe with an open top or a square pipe with an open top, a plurality of sand scraping plates are uniformly arranged in the bottom sand discharging pipe, the sand scraping plates are arranged to move along the length direction of the bottom sand discharging pipe to scrape the sand particles in the sand collecting hopper, the bottom sand discharging pipe is connected with a driving box through a conveying pipe, a driving gear is arranged in the driving box, the driving gear is connected with a first driver, the first driver is arranged to rotate in the positive direction and the reverse direction according to the signal feedback of a controller, and a sealing cover is arranged on the top plane of the aeration grit chamber to prevent the escape of odor. The application has the advantages of high sand discharging efficiency, prevention of odor escape and realization of sand removal at the bottom and slag removal at the top of the chamber.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to an aerated grit chamber for efficient sand removal. Background Technology

[0002] Wastewater treatment plants typically handle wastewater through three stages: primary wastewater treatment (pretreatment) primarily removes suspended particles and floating matter, usually through physical methods like filtration and sedimentation; secondary wastewater treatment (biochemical treatment) removes dissolved organic pollutants and colloidal pollutants, typically using chemical or biological methods; and tertiary wastewater treatment (advanced treatment) further treats recalcitrant organic matter and nutrients like nitrogen and phosphorus, often employing methods such as flocculation sedimentation, physical filtration, ion exchange, and ultrafiltration disinfection.

[0003] Grit chambers are part of the pretreatment process, located after the fine screen machinery and before the biochemical treatment tank in wastewater treatment. Their main function is to separate larger sand particles from the wastewater, reducing the load on the sedimentation tank and protecting the pumps of the subsequent wastewater treatment tanks from wear. Grit chambers come in various forms. Aerated grit chambers have aeration pipes installed on one longitudinal side of the tank. By adjusting the aeration rate, the rotation speed of the water flow is controlled, improving the stability of the settled sand. Aeration cleans the organic matter on the surface of the sand particles, making the settled sand clean and easy to handle.

[0004] Common aerated grit chambers typically use bridge-type sand suction machines for sand removal. However, these machines break down frequently and require extensive maintenance. Some aerated grit chambers also have deodorizing sealing devices at the top; the reciprocating motion of the bridge-type sand suction machine widens the gap between the chamber and the sealing device, leading to decreased sealing performance and odor leakage into the environment. Furthermore, the sand discharged by these suction devices has a high moisture content, resulting in low suction efficiency and high energy consumption. Therefore, a highly efficient aerated grit chamber with high sand removal efficiency, low moisture content, prevents odor escape, and simultaneously removes sand from the bottom and slag from the top is a pressing technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an aerated grit chamber for efficient sand removal.

[0006] The embodiments of the present invention are implemented as follows:

[0007] This invention provides an efficient aerated grit chamber for sand removal, comprising: a first slope and a second slope, the first slope being located above the second slope, and a sand collection hopper being disposed below the second slope. The sand collection hopper is located at the bottom of the aerated grit chamber, and a bottom sand discharge pipe is disposed within the sand collection hopper, extending along the length of the sand collection hopper. The bottom sand discharge pipe is configured as a semi-circular or square pipe with an open top. Multiple sand scrapers are evenly distributed within the bottom sand discharge pipe, and the sand scrapers are configured to move along the length of the bottom sand discharge pipe to scrape sand particles from the sand collection hopper. The bottom sand discharge pipe is connected to a drive housing via a conveying pipe. A drive gear is disposed within the drive housing, and the drive gear is connected to a first driver, which is configured to rotate in both directions according to signal feedback from a controller. A sealing cover is provided on the top surface of the aerated grit chamber to prevent odor from escaping.

[0008] In a preferred embodiment of the present invention, a torque sensor is provided on the first driver, the torque sensor is electrically connected to the controller, and the torque sensor transmits the currently detected torque value to the controller in real time; the controller is set with a torque threshold, and when the torque detected by the torque sensor reaches the set torque threshold, the controller controls the first driver to rotate in the reverse direction by a predetermined angle and then rotate in the forward direction again.

[0009] In a preferred embodiment of the present invention, a skimming pipe is provided in the upper space of the scum zone of the aerated grit chamber. The skimming pipe is configured to rotate in both directions according to the drive unit to skim the scum in the aerated grit chamber in both directions.

[0010] In a preferred embodiment of the present invention, a slag removal pipe is provided inside the slag skimming pipe. The slag removal pipe is coaxially arranged with the slag skimming pipe. The slag removal pipe is configured as a semi-circular pipe with an open top or a square pipe with an open top. Multiple scraping plates are evenly distributed inside the slag removal pipe. The scraping plates are configured to move along the length direction of the slag removal pipe to scrape off the floating slag inside the slag skimming pipe.

[0011] In a preferred embodiment of the present invention, a slag discharge channel is provided in the aerated grit chamber, and a slag discharge pipe is provided at the bottom of the slag discharge channel; the slag removal pipe is provided along the length direction of the aerated grit chamber, the slag removal pipe is located above the slag discharge channel, and a slag discharge port is provided below the slag removal pipe, and the floating slag in the slag removal pipe is discharged into the slag discharge channel along the slag discharge port.

[0012] In a preferred embodiment of the present invention, the drive housing is connected to the sand discharge hopper, the lowest point of the sand discharge hopper is lower than the lowest point of the drive housing; the sand discharge hopper has an inclined wall so that the sand in the drive housing falls into the drive housing, and a sand discharge pipe is provided at the bottom of the sand discharge hopper.

[0013] In a preferred embodiment of the present invention, an electric knife gate valve is provided on the sand discharge pipe. The electric knife gate valve is configured to open after a predetermined opening time according to the first actuator, and to close after a predetermined closing time according to the first actuator.

[0014] In a preferred embodiment of the present invention, a flushing pipe is provided above the aerated grit chamber, and multiple flushing nozzles are evenly distributed on the flushing pipe, which is arranged above the skimming pipe and the slag discharge well.

[0015] In a preferred embodiment of the present invention, an electric valve is provided on the flushing pipe, the electric valve is electrically connected to the controller, and the electric valve is configured to open or close synchronously with the first actuator.

[0016] In a preferred embodiment of the present invention, the bottom sand discharge pipe, the conveying pipe, the slag removal pipe, the drive housing, the connecting pipe, and the steering device are connected end to end to form a conveying pipe chain; the conveying pipe chain is internally arranged with sand scrapers and chains at intervals, and the drive gear is engaged with the chain and drives the sand scrapers to move circumferentially along the conveying pipe chain.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The first slope is located above the second slope, and the inclination angle of the first slope is smaller than that of the second slope. A sand collection hopper is provided below the second slope, and a bottom sand discharge pipe is provided inside the sand collection hopper. The bottom sand discharge pipe is laid along the length of the sand collection hopper. The bottom sand discharge pipe is configured as a semi-circular pipe or a square pipe with an open top, so that the sand in the aerated grit chamber falls into the bottom sand discharge pipe under the action of aeration gas. Multiple scraper blades are evenly distributed inside the bottom sand discharge pipe. The scraper blades are configured to move along the length of the bottom sand discharge pipe to scrape the sand particles in the sand collection hopper. The bottom sand discharge pipe is connected to the drive box through a conveying pipe. Compared with the existing bridge-type sand suction machine, the sand discharged by the bottom sand discharge pipe of this application has a low moisture content and high sand discharge efficiency.

[0019] 2. A skimming pipe is provided in the upper space of the scum zone of the aerated grit chamber. The skimming pipe is configured to rotate in both directions according to the drive unit to skim the scum in the scum zone of the aerated grit chamber in both directions. A slag removal pipe is provided inside the skimming pipe. The slag removal pipe is coaxially arranged with the skimming pipe. The slag removal pipe is configured as a semi-circular pipe with an open top or a square pipe with an open top. Multiple sand scrapers are evenly distributed inside the slag removal pipe. The sand scrapers are configured to move along the length of the slag removal pipe to scrape the scum inside the skimming pipe. The sand scrapers provided in the sand discharge pipe at the bottom of the tank move in the opposite direction to the sand scrapers provided in the skimming pipe, so as to realize sand removal at the bottom of the tank and slag removal at the top of the tank at the same time.

[0020] 3. The top plane of the aerated grit chamber is equipped with a sealing cover, which has a good sealing effect and prevents odor from escaping;

[0021] 4. The bottom sand discharge pipe is connected to the drive housing via a conveying pipe. A drive gear is installed inside the drive housing and is connected to the first driver. The first driver is configured to rotate in both directions according to the signal feedback from the controller. A torque sensor is installed on the first driver and is electrically connected to the controller. The torque sensor transmits the currently detected torque value to the controller in real time. The controller is set with a torque threshold. When the torque detected by the torque sensor reaches the set torque threshold, the controller controls the first driver to rotate in the reverse direction by a predetermined angle and then rotate in the forward direction again. This prevents excessive torque caused by sand particles getting stuck on the scraper and burning out the motor, reduces the probability of equipment damage, and improves the service life of the equipment. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is an overall schematic diagram of an aerated grit chamber for high-efficiency sand removal according to the present invention.

[0024] Figure 2 This is a schematic diagram of the internal structure of an aerated grit chamber for high-efficiency sand removal according to the present invention.

[0025] Figure 3 This is a top view schematic diagram of the internal structure of an aerated grit chamber for high-efficiency sand removal according to the present invention.

[0026] Figure 4This is a schematic diagram of the skimming pipe structure of an aerated grit chamber with high-efficiency sand removal according to the present invention.

[0027] Figure 5 This is a schematic diagram of a skimming pipe drive unit for an aerated grit chamber with high-efficiency sand removal according to the present invention.

[0028] Figure 6 This is a schematic diagram of a conveying pipe chain for an aerated grit chamber with high-efficiency sand removal according to the present invention.

[0029] Figure 7 This is a schematic diagram of the internal structure of the conveying pipe chain of an aerated grit chamber for high-efficiency sand removal according to the present invention.

[0030] Figure 8 This is a schematic cross-sectional view of the drive box of an aerated grit chamber for high-efficiency sand removal according to the present invention.

[0031] Attached icon numbers:

[0032] 1. Bottom sand discharge pipe; 2. Diverter; 3. Conveying pipe; 4. Drive housing; 5. Sand discharge hopper; 6. Sand discharge pipe; 7. Electric knife gate valve; 8. Drive unit; 9. Skimming pipe; 10. Support plate; 11. Slag removal pipe; 12. Flushing nozzle; 13. Flushing pipe; 14. Electric valve; 15. Slag discharge channel; 16. Vent valve; 17. Vent pipe; 18. Water outlet pipe; 19. First actuator; 20. Water outlet well; 21. First ramp; 22. Second ramp; 23. Torque sensor; 24. Sand scraper; 25. Chain; 26. Drive gear; 27. Sleeve; 28. Clamping ring; 29. ​​Second actuator; 30. Drive rod; 31. Slag discharge port; 32. Slag discharge pipe. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] This application provides an aerated grit chamber with high efficiency in sand removal, which solves the technical problems of odor emission, low sand suction efficiency of bridge-type sand suction machine and inability to achieve simultaneous sand removal and slag removal when using existing aerated grit chambers with bridge-type sand suction machine for sand removal; and provides the following specific embodiments for this purpose.

[0040] This embodiment provides an aerated grit chamber for efficient sand removal, referring to... Figures 1 to 8 This includes the first slope 21 and the second slope 22, as shown in the reference. Figure 3 The first slope 21 is located above the second slope 22. The slope of the first slope 21 is less than that of the second slope 22. A sand collecting hopper is provided below the second slope 22. The sand collecting hopper is located at the bottom of the aerated grit chamber so that when sand particles or larger particles slide along the slope, they have greater kinetic energy and can slide to the bottom of the aerated grit chamber.

[0041] An inlet is provided above one side wall of the aerated grit chamber, and the inlet is mechanically connected to the fine screen.

[0042] The aerated grit chamber is equipped with aeration pipes along its length, each with multiple aeration holes evenly distributed throughout. Aeration through these micropores causes wastewater to flow spirally forward along the chamber. Adjusting the aeration rate maintains a constant flow velocity, ensuring the wastewater's velocity remains constant regardless of flow rate variations. Furthermore, by adjusting the aeration rate, the rotation speed of the water flow can be controlled, resulting in a stable grit removal rate. Aeration also effectively separates organic matter from the surface of the sand particles, making the sand deposited at the bottom of the aerated grit chamber clean and easy to handle.

[0043] The sand collection hopper has vertical groove walls, allowing sand or larger particles to fall into it. A bottom sand discharge pipe 1 is installed inside the sand collection hopper, which abuts against the sand collection hopper and is laid along the length of the sand collection hopper. The bottom sand discharge pipe 1 is configured as a semi-circular pipe or a square pipe with an open top, so that sand or larger particles in the aerated sedimentation tank can fall into the sand collection hopper.

[0044] The sand discharge pipe 1 at the bottom of the pool is equipped with multiple sand scrapers 24 evenly distributed inside, as shown in the figure. Figure 3 and Figure 6 The scraper 24 is configured to move along the length of the bottom sand discharge pipe 1, and the outer contour of the scraper 24 is adapted to the inner contour of the bottom sand discharge pipe 1 so as to scrape sand particles in the sand collection hopper.

[0045] The bottom sand discharge pipe 1 is connected to the drive box 4 via the conveying pipe 3. The conveying pipe 3 is integrally formed with the bottom sand discharge pipe 1, and the inner and outer contours of the conveying pipe 3 are adapted to the inner and outer contours of the bottom sand discharge pipe 1. The conveying pipe 3 is connected to the drive box 4. The upper space of the conveying pipe 3 is higher than the liquid level of the aerated grit chamber. The drive box 4 is provided on the top of the conveying pipe 3 to prevent sewage in the aerated grit chamber from flowing back into the drive box 4.

[0046] The drive housing 4 is equipped with a drive gear 26, as shown in the reference. Figure 7 The drive gear 26 is connected to the first driver 19, which is configured to rotate in both directions according to the signal feedback from the controller. A torque sensor 23 is provided on the first driver 19, which is electrically connected to the controller. The torque sensor 23 detects the current torsional torque of the drive gear 26 in real time and transmits the detected torque value to the controller in real time.

[0047] Specifically, in this embodiment, the torque sensor 23 is configured to be a strain gauge type torque sensor, referring to... Figure 1 and Figure 3The strain gauge is attached to the force-bearing shaft. When the force-bearing shaft is subjected to external force and deforms, the strain gauge deforms synchronously. The elastic deformation of the strain gauge will cause the resistance value of the strain gauge to change, which in turn causes the voltage across the strain gauge to change, and thus the torque value across the strain gauge can be obtained.

[0048] The controller is set with a torque threshold. When the torque detected by the torque sensor 23 reaches the set torque threshold, the controller controls the first driver 19 to rotate in the reverse direction by a predetermined angle and then rotate in the forward direction again. This prevents the sand in the bottom sand discharge pipe 1 from sliding into the gap between the scraper 24 and the bottom sand discharge pipe 1, which would cause excessive torque and burn out the motor.

[0049] Specifically, the controller is equipped with a comparator that compares the torque value currently detected by the strain gauge with a torque threshold set by the controller. If the torque value currently detected by the torque sensor 23 reaches the set torque threshold, the controller controls the first driver 19 to rotate in the reverse direction by a predetermined angle, which is 90°, 180° or 360°. After rotating in the reverse direction by the predetermined angle, the first driver 19 rotates in the forward direction again.

[0050] If the torque detected by the torque sensor 23 is still greater than the set torque threshold when the first driver 19 rotates in the reverse direction by a predetermined angle and then rotates in the forward direction, the controller controls the first driver 19 to continue rotating in the reverse direction by a predetermined angle until the torque detected by the torque sensor 23 is within the set torque threshold range.

[0051] The controller is also equipped with a buzzer. If the torque detected by the torque sensor 23 is greater than the set torque threshold when the first driver 19 rotates in both the forward and reverse directions, the controller controls the buzzer to emit an alarm sound and controls the first driver 19 to turn off to avoid burning out the motor due to excessive torque.

[0052] One end of the sand discharge pipe 1 at the bottom of the pool is connected to the conveying pipe 3, as shown in the reference. Figure 6 The other end of the bottom sand discharge pipe 1 is connected to the steering device 2. The steering device 2 is equipped with a steering gear. The steering gear is rotatably connected to the steering device 2 via a rotating shaft. The rotating gear has multiple protruding pointed teeth evenly distributed on it. The pointed teeth are engaged in the gap of the chain 25, converting the horizontal movement of the sand scraper 24 into a vertical tilting movement.

[0053] The upper space of the scum zone in the aerated grit chamber is also equipped with a skimming pipe 9, as shown in the reference. Figures 2 to 4The slag removal pipe 9 is provided with a slag removal pipe 11, which is coaxially arranged with the slag removal pipe 9. The slag removal pipe 11 removes the floating slag in the slag removal pipe 9.

[0054] One end of the slag removal pipe 11 is connected to the drive housing 4 via a bend connector, and the other end of the slag removal pipe 11 is connected to the steering gear 2. The steering gear 2 is equipped with a steering gear, which is rotatably connected to the steering gear 2 via a rotating shaft. The rotating gear has multiple protruding pointed teeth evenly distributed on it. The pointed teeth are engaged in the gaps of the chain 25, converting the horizontal movement of the scraper 24 into a vertical tilting movement. The steering gear 2 connected to the slag removal pipe 11 and the steering gear 2 connected to the bottom sand discharge pipe 1 are symmetrically arranged. The two symmetrically arranged steering gears 2 are connected by a connecting pipe, and the inner and outer contours of the connecting pipe are adapted to the inner and outer contours of the bottom sand discharge pipe 1.

[0055] The bottom sand discharge pipe 1, conveying pipe 3, slag removal pipe 11, connecting pipe, steering device 2, and drive box 4 are connected end to end to form a conveying pipe chain, as shown in the figure. Figure 6 and Figure 7 The conveying pipe chain has chains 25 and scraper blades 24 arranged at intervals inside. The drive gear 26 is engaged with the chain 25 and drives the scraper blades 24 to move linearly or obliquely along the conveying pipe 3. The scraper blades 24 set in the slag removal pipe 11 and the scraper blades 24 set in the bottom sand discharge pipe 1 have a tendency to move in opposite directions, thereby simultaneously realizing the removal of sand at the bottom of the pool and the removal of slag at the top of the pool, resulting in high sand discharge efficiency.

[0056] The steering gear 2 and the drive housing 4 are installed in the external space of the aerated grit chamber, making equipment inspection and maintenance convenient. The pipes in the scum area and the bottom sand discharge area are set with open openings, allowing scum and sand to enter the pipes and be scraped off by the scraper, making it easy to observe. When the equipment needs maintenance, it can be maintained without stopping the water supply.

[0057] The cross-section of the conveying pipe of the conveying chain is set to be square or circular, and the sand scraper 24 is set to be square or circular to match the conveying pipe. The tops of the bottom sand discharge pipe 1 and the slag removal pipe 11 forming the conveying chain are both set to be open to facilitate the discharge of scum and sediment.

[0058] In addition, the conveying pipeline chain of this application can be customized according to the three-dimensional spatial dimensions of the existing aerated grit chamber to achieve three-dimensional spatial arrangement, and can be used for the project renovation of existing aerated grit chambers or the installation of integrated sand removal and slag discharge projects for newly built aerated grit chambers.

[0059] Preferably, the diverter 2, which is connected to the bottom sand discharge pipe 1, is equipped with a vent pipe 17. The vent pipe 17 is used to discharge wastewater from the aerated grit chamber when the chamber needs to be emptied. The vent pipe 17 is equipped with a vent valve 16, which is a gate valve. By manually opening the gate valve, the water in the aerated grit chamber can be controlled to flow out of the vent pipe 17 and into the plant's drainage network.

[0060] The top plane of the aerated grit chamber is equipped with a sealed cover, as shown in the reference. Figure 1 The sealing cover is fastened to the top plane of the aerated grit chamber to prevent odor from escaping; preferably, a sealing ring is provided below the sealing cover, and the sealing ring abuts against the top plane of the aerated grit chamber to improve the sealing performance of the aerated grit chamber.

[0061] A skimming pipe 9 is installed in the upper space of the scum zone of the aerated grit chamber, as per [reference]. Figure 2 , Figure 3 and Figure 4 The scum-skimming pipe 9 is rotatably connected to the scum discharge channel 15. A sleeve 27 is provided at the end of the scum discharge channel 15. The scum-skimming pipe 9 is rotatably connected inside the sleeve 27. The scum-skimming pipe 9 is a thin-walled cylindrical pipe. The top of the scum-skimming pipe 9 is provided with an intermittent opening, which can meet the strength requirements of the scum-skimming pipe 9 and remove the floating scum in the aerated grit chamber.

[0062] The skimming pipe 9 is configured to rotate in both directions according to the drive unit to remove scum from the aerated grit chamber. Specifically, the drive unit 8 includes a second driver 29, on which a pair of meshing gears are provided. One of the gears is fitted with a drive rod 30, the upper space of which is provided with an external thread, and the gear is provided with an internal thread that matches the drive rod. The drive rod 30 is configured to move up and down according to the rotation of the gear. The other gear is fixedly mounted on the output shaft of the second driver 29. After the second driver 29 is started, the meshing gears on the second driver 29 rotate synchronously, thereby driving the drive rod 30 on the gear to move up and down.

[0063] A convex block is provided below the drive rod 30, as shown in the reference. Figure 5 The convex block is hinged to the clamping ring 28, and the clamping ring 28 is fixedly connected to the skimming pipe 9. The skimming pipe 9 is rotatably connected to the aerated grit chamber. The skimming pipe 9 rotates in both directions according to the up and down movement of the drive rod 30, thereby skimming the scum in the aerated grit chamber in both directions, with high skimming efficiency.

[0064] Preferably, a handwheel is provided above the drive rod 30. Rotating the handwheel in both directions can also control the scum removal pipe 9 to rotate in both directions, thus manually controlling the removal of scum in the aerated grit chamber.

[0065] The aerated grit chamber is also provided with multiple support plates 10, and the support plates 10 are provided with through holes that are adapted to the skimming pipe 9 to assist in supporting the skimming pipe 9.

[0066] The slag skimming pipe 9 is equipped with a slag removal pipe 11, as shown in the reference. Figure 2 and Figure 3 The slag removal pipe 11 is coaxially arranged with the slag skimming pipe 9. The slag removal pipe 11 is configured as a semi-circular pipe with an open top or a square pipe with an open top. Multiple scraper plates 24 are evenly distributed inside the slag removal pipe 11. The scraper plates 24 are configured to move along the length of the slag removal pipe 11 to scrape off the floating slag inside the slag skimming pipe 9. The scraper plates 24 arranged on the slag removal pipe 11 move in opposite directions to the scraper plates 24 arranged on the bottom sand discharge pipe 1, so that when the first driver 19 is started, the settled sand in the bottom sand discharge pipe 1 and the floating slag in the slag removal pipe 11 are discharged synchronously.

[0067] Preferably, the aerated grit chamber is provided with a slag discharge channel 15, and a slag discharge pipe 32 is provided at the bottom of the slag discharge channel 15; the slag removal pipe 11 is provided along the length of the aerated grit chamber, the slag removal pipe 11 is located above the slag discharge channel 15, and a slag discharge port 31 is provided below the slag removal pipe 11. The slag discharge port 31 is directly opposite the slag discharge channel 15. The scum in the skimming pipe 9 is discharged into the slag discharge channel 15 along the slag discharge port 31 and finally discharged from the slag discharge pipe 32.

[0068] The aerated grit chamber is also equipped with an outlet well 20. The outlet well 20 is located on the side away from the drive box 4. One side wall of the outlet well 20 is lower than the outer wall of the aerated grit chamber. The wastewater treated by the aerated grit chamber flows to the outlet well 20. An outlet pipe 18 is provided below the outlet well 20. The water in the outlet well 20 is discharged through the outlet pipe 18.

[0069] One end of the drive housing 4 is connected to the conveying pipe 3, and a sand discharge hopper 5 is also connected to the drive housing 4. Figure 8The bottom of the sand discharge hopper 5 is provided with a sand discharge pipe 6, which is vertically arranged to discharge the sand that falls into the sand discharge hopper 5. Preferably, the sand discharge hopper 5 has an inclined wall, which is set at an acute angle to the horizontal direction. The lowest point of the sand discharge hopper 5 is lower than the lowest point of the drive housing 4, so that the sand conveyed by the scraper 24 in the conveying pipe 3 falls directly into the sand discharge hopper 5 and is discharged along the sand discharge pipe 6. During the lifting process of the conveying pipe 3, the scraper 24 automatically realizes sand-water separation, and the discharged sand has a low moisture content, eliminating the need for secondary separation by a sand-water separator, resulting in high sand discharge efficiency and reduced energy consumption for sand discharge.

[0070] The outlet of the sand discharge pipe 6 is connected to the sand collector to collect the sand discharged from the aerated sand settling tank.

[0071] Preferably, an electric knife gate valve 7 is provided on the sand discharge pipe 6. The electric knife gate valve 7 is electrically connected to the controller. The electric knife gate valve 7 is configured to open after the first driver 19 starts rotating for a predetermined time, and to close after the first driver 19 stops rotating for a predetermined time.

[0072] The predetermined time is the ratio of the length from the bottom sand discharge pipe 1 to the drive box 4 to the moving speed of the scraper 24.

[0073] The electric knife gate valve 7 includes a gate, a housing, a screw, and a drive motor. Both ends of the housing are connected to the sand discharge pipe 6. The housing has a cavity through which the gate passes, and the gate is slidably connected within the cavity. The other end of the gate is rotatably connected to the screw. The output shaft of the drive motor is connected to a pair of meshing bevel gears. The screw passes through one of the bevel gears, and the bevel gear has a threaded hole adapted to the screw. The screw is fitted into the threaded hole. The gate is configured to open or close the sand discharge pipe 6 according to the forward or reverse rotation of the drive motor. The drive motor is electrically connected to the controller and is configured to rotate forward or reverse according to a signal from the controller.

[0074] Preferably, the electric knife gate valve 7 is further provided with a switch position sensor to detect whether the electric knife gate valve 7 is fully open or fully closed.

[0075] A flushing pipe 13 is installed above the aerated grit chamber, as shown in the reference. Figure 1 and Figure 2 The flushing pipe 13 is evenly distributed with multiple flushing nozzles 12, which are arranged above the slag skimming pipe 9 and the water outlet well 20 to clean the slag removal pipe 11 and prevent scum and other fibrous materials from adhering.

[0076] An electric valve 14 is provided on the flushing pipe 13. The electric valve 14 is equipped with an open position sensor and a closed position sensor. The electric valve 14 is electrically connected to the controller. The electric valve 14 is set to open or close synchronously with the first driver 19 in order to remove the floating slag and other fibrous materials attached to the surface of the slag removal pipe 11 and the skimming pipe 9.

[0077] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An efficient aerated grit chamber for sand removal, comprising a first slope (21) and a second slope (22), wherein the first slope (21) is located above the second slope (22), and a sand collecting hopper is disposed below the second slope (22), the sand collecting hopper being disposed at the bottom of the aerated grit chamber, characterized in that, The sand collection hopper is equipped with a bottom sand discharge pipe (1), which is laid along the length of the sand collection hopper. The bottom sand discharge pipe (1) is configured as a semi-circular pipe or a square pipe with an open top. Multiple sand scrapers (24) are evenly distributed inside the bottom sand discharge pipe (1). The sand scrapers (24) are configured to move along the length of the bottom sand discharge pipe (1) to scrape sand particles in the sand collection hopper. The bottom sand discharge pipe (1) is connected to the drive housing (4) through a conveying pipe (3). The drive housing (4) is equipped with a drive gear (26), which is connected to a first driver (19). The first driver (19) is configured to respond to the signal feedback from the controller. Reverse rotation; a sealed cover is provided on the top plane of the aerated grit chamber to prevent odor from escaping; a skimming pipe (9) is provided in the upper space of the scum zone of the aerated grit chamber, and the skimming pipe (9) is configured to rotate forward and backward according to the drive of the drive unit to skim the scum in the aerated grit chamber in both directions; a slag removal pipe (11) is provided inside the skimming pipe (9), and the slag removal pipe (11) is coaxially arranged with the skimming pipe (9). The slag removal pipe (11) is configured as a semi-circular pipe with an open top or a square pipe with an open top. Multiple scraper plates (24) are evenly distributed inside the slag removal pipe (11), and the scraper plates (24) are configured to move along the length direction of the slag removal pipe (11) to scrape the scum inside the skimming pipe (9).

2. The aerated grit chamber for high-efficiency sand removal according to claim 1, characterized in that: The first driver (19) is provided with a torque sensor (23), which is electrically connected to the controller. The torque sensor (23) transmits the currently detected torque value to the controller in real time. The controller is set with a torque threshold. When the torque detected by the torque sensor (23) reaches the set torque threshold, the controller controls the first driver (19) to rotate in the reverse direction by a predetermined angle and then rotate in the forward direction again.

3. The aerated grit chamber for high-efficiency sand removal according to claim 1, characterized in that: The aerated grit chamber is provided with a slag discharge channel (15), and a slag discharge pipe (32) is provided at the bottom of the slag discharge channel (15); the slag removal pipe (11) is provided along the length of the aerated grit chamber, the slag removal pipe (11) is located above the slag discharge channel (15), and a slag discharge port (31) is provided below the slag removal pipe (11). The scum in the skimming pipe (9) is discharged into the slag discharge channel (15) along the slag discharge port (31).

4. The aerated grit chamber for high-efficiency sand removal according to claim 1, characterized in that: The drive housing (4) is connected to the sand discharge hopper (5), and the lowest point of the sand discharge hopper (5) is lower than the lowest point of the drive housing (4). The sand discharge hopper (5) has an inclined wall, so that the sand in the drive housing (4) falls into the drive housing (4). The bottom of the sand discharge hopper (5) is provided with a sand discharge pipe (6).

5. The aerated grit chamber for high-efficiency sand removal according to claim 4, characterized in that: An electric knife gate valve (7) is provided on the sand discharge pipe (6). The electric knife gate valve (7) is configured to open after a predetermined time when the first driver (19) opens, and to close after a predetermined time when the first driver (19) closes.

6. The aerated grit chamber for high-efficiency sand removal according to claim 1, characterized in that: A flushing pipe (13) is provided above the aerated grit chamber, and multiple flushing nozzles (12) are evenly distributed on the flushing pipe (13). The multiple flushing nozzles (12) are arranged above the skimming pipe (9) and the effluent well (20).

7. The aerated grit chamber for high-efficiency sand removal according to claim 6, characterized in that: An electric valve (14) is provided on the flushing pipe (13). The electric valve (14) is electrically connected to the controller. The electric valve (14) is configured to open or close synchronously with the first driver (19).

8. The aerated grit chamber for high-efficiency sand removal according to claim 1, characterized in that: The bottom sand discharge pipe (1), the conveying pipe (3), the slag removal pipe (11), the drive box (4), the connecting pipe and the steering device (2) are connected end to end to form a conveying pipe chain; the conveying pipe chain is internally arranged with sand scrapers (24) and chains (25), and the drive gear (26) is engaged with the chain (25) and drives the sand scrapers (24) to move circumferentially along the conveying pipe chain.

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