Sewage treatment sedimentation tank and sewage treatment system

Abstract

The present application relates to the technical field of sedimentation tank, and specifically relates to a sewage treatment sedimentation tank, which comprises a tank body, a water inlet base body and a cleaning body, the water inlet base body is fixedly installed at the center of the tank body, a water inlet flow channel is formed in the water inlet base body, and the cleaning body is rotatably installed below the water inlet base body, the water inlet flow channel comprises, in sequence along the water inlet direction, a water inlet energy dissipation section, a horizontal flow section and a impurity interception section, the water inlet energy dissipation section is a vertically arranged wave structure, the cross section of the impurity interception section is funnel-shaped, a reagent cavity is formed in the side wall of the water inlet flow channel and is connected with the water inlet flow channel, a moving wall is slidably installed on the side of the reagent cavity close to the water inlet flow channel, the cleaning body is rotatably installed below the water inlet base body, the cleaning body extrudes the moving wall to move vertically and intermittently connects the water inlet flow channel and the reagent cavity to intermittently inject reagents, and the cleaning body moves relatively to extrude and pierce the sludge while extruding the moving arm; the problem that the increase of suspended matter caused by the floating of sludge filled with gas in the sedimentation tank affects water quality is solved.

Description

Technical Field

[0001] This invention relates to the field of sedimentation tank technology, specifically a wastewater treatment sedimentation tank and wastewater treatment system. Background Technology

[0002] In the process of treating wastewater in existing sedimentation tanks, anaerobic microorganisms at the bottom of the sedimentation tank decompose organic matter through metabolism such as fermentation, thereby producing gases such as carbon dioxide, methane, or nitrogen. These gases fill the sludge, causing it to expand and reduce its density, which in turn causes the sludge to float to the surface. Ultimately, this leads to an increase in suspended solids in the sedimentation tank, affecting water quality.

[0003] Therefore, the present invention provides a wastewater treatment sedimentation tank and a wastewater treatment system to solve the above-mentioned problems. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the sludge in the sedimentation tank is filled with gas and floats to the surface, which increases the amount of suspended solids and affects the water quality.

[0005] This invention provides the following technical solution: a wastewater treatment sedimentation tank, comprising a tank body, an inlet substrate, and a cleaning body. The inlet substrate is fixedly installed at the center of the tank body, and an inlet channel is formed inside the inlet substrate. The cleaning body is rotatably installed below the inlet substrate. The inlet channel includes an inlet energy dissipation section, a horizontal flow section, and an impurity interception section connected sequentially along the inlet direction. The inlet energy dissipation section is a vertically arranged wave structure, the horizontal flow section is a horizontal structure, and the impurity interception section has a funnel-shaped cross-section. A reagent chamber is formed on the side wall of the inlet channel, which is connected to the inlet channel. A movable wall is vertically slidably installed near the side of the inlet channel in the reagent chamber. The cleaning body is rotatably installed below the inlet substrate. During rotation, the cleaning body squeezes the movable wall to move vertically and intermittently connects the inlet channel and the reagent chamber for intermittent chemical injection. While squeezing the movable wall, the cleaning body also moves relative to itself to squeeze and pierce the sludge. After the sewage enters the impurity interception section, the solid impurities in the slow-flowing sewage are located in the lower layer of the sewage and are thus intercepted at the lowest level of the funnel-shaped impurity interception section. This improves the water quality of the sewage entering the sedimentation tank and helps to improve the sewage treatment effect of the sedimentation tank.

[0006] The cleaning assembly includes a drive motor, a cleaning body, and an extrusion body. The drive motor is fixedly installed below the tank body, and a drive gear is fixedly installed on the output shaft of the drive motor. The cleaning body is rotatably installed on the outside of the inlet pipe. A driven gear ring is axially fixedly installed below the cleaning body, and the drive gear meshes with the driven gear ring. The extrusion body is hinged to the surface of the cleaning body, and a hydraulic damper is hinged between the cleaning body and the extrusion body. The extrusion body compresses the sludge and impurities between the cleaning body and the extrusion body. On the one hand, this compresses the sludge, increasing its density and cohesion to prevent it from floating, thereby improving the wastewater treatment efficiency of the sedimentation tank. On the other hand, it discharges nitrogen gas produced by the nitrification reaction of microorganisms in the sludge, preventing the sludge from expanding, loosening, and floating again.

[0007] The impurity interception section comprises a front section, a middle section, and a rear section fixedly connected sequentially along the water inlet direction. The rear section has a greater horizontal height and length than the front section. This allows the wastewater to overflow as it flows through the rear section, causing impurities in the wastewater to be intercepted and rolled down into the middle section for storage due to their own weight. This reduces the amount of impurities entering the sedimentation tank, thus improving the wastewater treatment efficiency of the sedimentation tank.

[0008] The rear section has a trapezoidal structure, and the width of the front section is equal to or less than the shortest parallel side of the trapezoidal structure of the rear section. The rear section, with its trapezoidal structure, has a larger space than the front section, thereby reducing the sewage flow velocity by filling the suddenly expanded space. In this way, with the sewage inflow rate remaining constant, the reduced sewage flow velocity further improves the sedimentation effect of impurities and makes it easier for impurities to be intercepted and rolled back to the middle section by reducing their kinetic energy.

[0009] The surface of the movable wall has a connecting hole that connects the water inlet channel and the reagent chamber. An inclined body that intermittently contacts the cleaning body is fixedly installed below the movable wall, and the inclined body passes through the water inlet substrate.

[0010] A sliding body with a matching inclined body is slidably installed above the extrusion body. Both the upper and lower ends of the sliding body are inclined structures. A moving plate is slidably installed on the lower inclined structure side of the sliding body. The end of the moving plate near the sliding body is a matching inclined structure. Multiple blades are fixedly installed on the surface of the moving plate. The blades slide through the extrusion body.

[0011] The cleaning body includes a main body and a collecting rod. The main body is rotatably mounted on the surface of the inlet substrate, and the collecting rod is fixedly mounted on the front section of the main body along the direction of rotation. The collecting rod is installed at an angle to the main body. The inclined angle guides the sludge to move towards the center of the sedimentation tank, so that it can be discharged through the sludge outlet opened in the center of the sedimentation tank, which is beneficial for the cleaning body to clean and discharge the sludge.

[0012] The collecting rod is divided into a squeezing section and an extension section. An extension section is fixedly installed at the end of the squeezing section near the side wall of the sedimentation tank, and the included angle of the extension section is larger than that of the squeezing section. The squeezing section and the squeezing body work together to lightly compress the sludge, thereby slightly increasing the sludge density and expelling air from the sludge, thus preventing the sludge from floating and reducing suspended solids in the sedimentation tank. The larger included angle of the extension section compared to the squeezing section increases the sludge's movement speed towards the center of the sedimentation tank while maintaining a constant speed, thereby improving the efficiency of sludge cleaning.

[0013] The middle section is arranged at an angle with the water inlet direction perpendicular to the water inlet direction, and a sewage outlet is opened at the lower horizontal end of the middle section.

[0014] The present invention also provides a wastewater treatment system including the aforementioned wastewater treatment sedimentation tank, wherein a pretreatment tank is connected in front of the wastewater treatment sedimentation tank, and a post-treatment tank and a sludge treatment tank are arranged in parallel behind the wastewater treatment sedimentation tank. The pretreatment tank is provided with multiple sets of bar screens along the wastewater flow direction, and the bar spacing in the multiple sets of bar screens decreases sequentially. The post-treatment tank includes an aeration tank and a biofilm reactor connected in parallel, and a parallel pipeline connects the aeration tank and the biofilm reactor.

[0015] The beneficial effects of this invention are as follows: 1. In this invention, the cleaning component can cooperate with the influent substrate during the cleaning of sludge at the bottom of the sedimentation tank. This allows for the automatic and quantitative addition of chemicals to the wastewater entering the influent substrate while cleaning the sludge. The chemicals begin mixing and flocculation as soon as the wastewater enters, improving sedimentation efficiency and mixing uniformity, thereby enhancing the quality of the effluent from the sedimentation tank. Furthermore, while automatically adding chemicals to the wastewater entering the influent substrate, the component also squeezes and punctures the sludge at the bottom of the sedimentation tank, releasing air from the sludge to prevent it from floating, thus reducing suspended solids in the sedimentation tank and improving the quality of the effluent.

[0016] 2. By combining the inlet energy dissipation section, the horizontal flow section, and the impurity interception section in the inlet substrate, this invention can intercept and filter impurities in the sewage before it enters the sedimentation tank, thereby improving the quality of the sewage in the sedimentation tank and improving the quality of the effluent from the sedimentation tank. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the cleaning component of the present invention; Figure 4 This is a top cross-sectional view of the water inlet channel and reagent chamber in the water inlet matrix of the present invention; Figure 5 This is a schematic cross-sectional view of the interconnected water inlet substrate and reagent chamber of the present invention. Figure 6 This is a schematic cross-sectional view of the movable wall repositioning barrier between the water inlet substrate and the reagent chamber of the present invention. Figure 7 This is a schematic diagram of the inclined plane structure in which the inclined body, sliding body, and moving plate cooperate with each other in this invention; Figure 8 This is a schematic cross-sectional view of the extruded body of the present invention; Figure 9 This is a schematic cross-sectional view of the impurity interception section of the present invention; Figure 10 This is a schematic diagram of the wastewater treatment process of the wastewater treatment system of the present invention.

[0019] In the diagram: 1. Pool body; 11. Inlet pipe; 12. Drain pipe; 2. Inlet substrate; 21. Inlet energy dissipation section; 211. Liquid inlet hole; 22. Horizontal flow section; 23. Impurity interception section; 231. Front section; 232. Middle section; 233. Rear section; 24. Reagent chamber; 25. Moving wall; 251. Connecting hole; 252. Inclined body; 26. Slide chute; 3. Cleaning assembly; 31. Drive motor; 311. Drive gear; 32. Cleaning body; 321. Driven gear ring; 322. Body; 323. Collecting rod; 324. Extrusion section; 325. Extension section; 33. Extrusion body; 331. Sliding body; 332. Moving plate; 333. Spring; 334. Blade body; 34. Hydraulic damping; 4. Slag discharge plate; 41. Slag discharge port. Detailed Implementation

[0020] 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, not all, of the embodiments of the present invention. Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] 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.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and "back side," 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 in which the product of this invention is conventionally placed during use. These terms are used only for the convenience of describing the invention and for 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; therefore, they should not be construed as limitations on the invention.

[0023] It should also be noted that, in the description of this invention, 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 according to the specific circumstances.

[0024] Example 1: Based on the technical problem of sludge in sedimentation tanks becoming filled with gas and floating upwards, leading to an increase in suspended solids and affecting water quality, see [reference needed]. Figure 1 and 2 A wastewater treatment sedimentation tank and wastewater treatment system are disclosed, comprising a tank body 1, an inlet substrate 2, and a cleaning assembly 3. The inlet substrate 2 is fixedly installed at the center of the tank body 1, and an inlet flow channel is formed inside the inlet substrate 2. The cleaning assembly 3 is rotatably installed below the inlet substrate 2. The inlet flow channel includes an inlet energy dissipation section 21, a horizontal flow section 22, and an impurity interception section 23 connected sequentially along the inlet direction. The inlet energy dissipation section 21 is a vertically arranged wave structure, and the horizontal flow section 22 is a horizontal structure. The cross-section of the impurity interception section 23 is funnel-shaped. A reagent chamber 24 communicating with the water inlet channel is provided on the side wall of the water inlet channel. A movable wall 25 is vertically slidably installed on the side of the reagent chamber 24 near the water inlet channel. A cleaning component 3 is rotatably installed below the water inlet substrate 2. The cleaning component 3 squeezes the movable wall 25 to move vertically during rotation, intermittently communicating the water inlet channel and the reagent chamber 24 to inject chemicals intermittently. While squeezing the movable arm, the cleaning component 3 moves relative to itself to squeeze and puncture the sludge.

[0025] See Figure 5 and 6The water inlet energy dissipation section 21 has an inlet hole 211 near the reagent chamber 24, and the moving wall 25 has a connecting hole 251 on its surface. After the moving wall 25 moves upward, the connecting hole 251 will align with the inlet hole 211, thereby connecting the reagent chamber 24 and the water inlet energy dissipation section 21, and thus allowing the addition of reagents to the water inlet energy dissipation section 21.

[0026] See Figure 1 A water inlet pipe 11 for conveying sewage into the water inlet substrate 2 is fixedly installed below the pool body 1, and a sewage discharge pipe 12 for discharging sludge from the bottom of the pool body 1 is fixedly installed at the center below the pool body 1.

[0027] See Figure 2 , Figure 4 and Figure 6 It should be noted that the movable wall 25 is installed in the reagent chamber 24 by opening a sliding groove 26 on the opposite side, and the two ends of the sliding groove 26 are the stop points for the movable wall 25 to move up and down.

[0028] See Figure 1 It should be noted that the scum on the surface of the sedimentation tank is collected by the scum discharge plate 4 in the prior art and discharged through the scum discharge port 41, which will not be elaborated on here.

[0029] Wastewater is input through the inlet substrate 2 at the center of tank 1. In the inlet channel, the wastewater first enters the vertical wave-structured inlet energy dissipation section 21. This section slows down and eliminates the kinetic energy of the wastewater, reducing its flow velocity and facilitating the sedimentation of solid impurities. After passing through the vertical wave-structured inlet energy dissipation section 21, the wastewater enters the horizontal flow section 22, and then from there into the impurity interception section 23. Here, the solid impurities in the slow-flowing wastewater are located at the lower layer and are intercepted at the lowest horizontal position of the funnel-shaped impurity interception section 23. This improves the water quality entering the sedimentation tank of tank 1, enhancing the wastewater treatment efficiency of the sedimentation tank.

[0030] After the wastewater enters the sedimentation tank, the cleaning component 3 can rotate to clean and scrape away impurities, such as sludge, that have settled at the bottom of the sedimentation tank. The impurities cleaned by the cleaning component 3 can be collected through a sludge storage tank in the prior art, with some being transported off-site and some being recycled.

[0031] During the rotation of the cleaning component 3, the slidingly mounted movable wall 25 moves up and down, intermittently connecting the inlet channel and the reagent chamber 24, thereby achieving intermittent injection of the agent. The agent described in this embodiment is a flocculant used in the prior art for treating wastewater. By intermittently controlling the up-and-down movement of the movable wall 25 through the movement of the cleaning component 3, the injection of the agent can be quantitatively controlled during the cleaning process of the cleaning component 3 cleaning impurities at the bottom of the sedimentation tank. This facilitates stable and quantitative injection of the flocculant, improving the sedimentation tank's ability to treat impurities.

[0032] See Figure 2 and 3 The cleaning assembly 3 includes a drive motor 31, a cleaning body 32, and an extrusion body 33. The drive motor 31 is fixedly installed below the tank body 1. A drive gear 311 is fixedly installed on the output shaft of the drive motor 31. The cleaning body 32 is rotatably installed on the outside of the water inlet pipe 11. A driven gear ring 321 is axially fixed below the cleaning body 32. The drive gear 311 meshes with the driven gear ring 321. The extrusion body 33 is hinged to the surface of the cleaning body 32, and a hydraulic damper 34 is hinged between the cleaning body 32 and the extrusion body 33. After the drive motor 31 starts, the drive gear 311 on the output shaft meshes with the driven gear ring 321, driving the cleaning body 32 to rotate and scrape away the sludge at the bottom of the sedimentation tank.

[0033] During the rotation of the cleaning body 32 and the squeezing body 33, the upper side of the squeezing body 33 intermittently contacts the lower side of the moving wall 25, thereby driving the moving wall 25 to move upward and connect the water inlet channel and the reagent chamber 24. After the moving wall 25 moves upward, it stops moving, and the squeezing body 33 is obstructed from rotating and moves closer to the cleaning body 32. This allows the squeezing body 33 to squeeze the sludge and impurities between the cleaning body 32 and the squeezing body 33. On the one hand, it can squeeze the sludge to increase its density and cohesion to prevent it from floating, thereby improving the effect of the sedimentation tank in treating sewage. On the other hand, it can discharge the nitrogen gas produced by the nitrification reaction of microorganisms in the sludge, preventing the sludge from expanding, loosening, and floating again.

[0034] After the extrusion body 33 rotates and releases contact with the lower part of the moving wall 25, the extrusion body 33 slowly resets via hydraulic damping 34 to prevent agitation of sludge at the bottom of the sedimentation tank. Furthermore, the hydraulic damping 34 limits the angle at which the extrusion body 33 rotates towards the cleaning body 32, thereby preventing excessive extrusion of the sludge by the extrusion body 33, which could lead to excessive sludge agglomeration and make the sludge too hard for subsequent transport and processing. This ensures that the sludge remains moderately loose after extrusion, facilitating discharge and transport, and preventing it from easily floating.

[0035] It should be noted that during the process of the extrusion body 33 contacting the moving wall 25, the moving wall 25 and the extrusion body 33 exert forces on each other. Since the hydraulic damping rod 34 fixedly installed between the extrusion body 33 and the cleaning body 32 can provide a certain supporting force, during the process of the moving wall 25 and the extrusion body 33 contacting each other, the moving wall 25 moves upward first, and then the moving wall 25 moves upward and presses against the extrusion body 33 and applies resistance, thereby stopping the extrusion body 33 from moving while the cleaning body 32 continues to rotate, thus causing the extrusion body 33 and the moving body to approach each other and extrude sludge.

[0036] It should be noted that the movable wall 25 can be reset and moved downward by its own weight after moving upward.

[0037] See Figure 2 and 9 The impurity interception section 23 includes a front section 231, a middle section 232, and a rear section 233, which are fixedly connected in sequence along the water inlet direction. The horizontal height and length of the rear section 233 are both greater than those of the front section 231. When sewage enters the impurity interception section 23 after passing through the inlet energy dissipation section 21 and the horizontal flow section 22, it first enters the front section 231. Since the cross-section of the front section 231, the middle section 232, and the rear section 233 forms a funnel shape, and the horizontal height and length of the rear section 233 are both greater than those of the front section 231, the sewage overflows as it flows through the rear section 233. This causes impurities in the sewage to be intercepted and rolled down into the middle section 232 for storage due to their own weight. This reduces the amount of impurities entering the sedimentation tank, thus improving the sewage treatment efficiency of the sedimentation tank.

[0038] See Figure 9 The rear section 233 has a trapezoidal structure, and the width of the front section 231 is equal to or less than the shortest parallel side of the trapezoidal structure of the rear section 233. This allows sewage to enter the space expansion area as it flows from the front section 231 to the rear section 233. The trapezoidal structure of the rear section 233 is larger than the space of the front section 231, thereby reducing the sewage flow velocity by filling the expanded space. Furthermore, with a constant sewage flow rate, the reduced sewage flow velocity further improves the sedimentation effect of impurities and makes it easier for impurities to be intercepted and rolled back to the middle section 232 by the rear section 233.

[0039] See Figure 5 and 6The movable wall 25 has a connecting hole 251 on its surface that connects the water inlet channel and the reagent chamber 24. An inclined body 252, which intermittently contacts the cleaning body 32, is fixedly installed below the movable wall 25. The inclined body 252 passes through the water inlet base 2. A sliding body 331, which cooperates with the inclined body 252, is slidably installed above the squeezing body 33. A one-way valve is fixedly installed inside the connecting hole 251 to prevent wastewater from entering the reagent chamber 24.

[0040] During the rotation of the extrusion body 33 and the cleaning body 32, the sliding body 331 above the extrusion body 33 contacts the inclined body 252 and drives the inclined body 252 and the moving wall 25 to move upward. Thus, the upward-moving inclined body 252 drives the moving wall 25 to move upward, connecting the water inlet channel and the reagent chamber 24. This allows the reagent in the reagent chamber 24 to enter the water inlet channel and mix with the sewage. In this way, the sedimentation effect of impurities in the sewage can be improved by adding reagents, thereby improving the sewage treatment effect of the sedimentation tank.

[0041] See Figure 3 The sliding body 331 has inclined structures at both its upper and lower ends. A movable plate 332 is slidably mounted on the inclined structure at the lower end of the sliding body 331. The end of the movable plate 332 near the sliding body 331 has a mutually cooperating inclined structure. A spring 333 is fixedly installed between the movable plate 332 and the extrusion body 33. A plurality of blades 334 are fixedly installed on the surface of the movable plate 332. The blades 334 slide through the extrusion body 33.

[0042] As the sliding body 331 above the extrusion body 33 contacts the inclined body 252 on the lower side of the moving wall 25, and the moving wall 25 moves upward to the stop point, causing the extrusion body 33 to rotate and approach the cleaning body 32 to extrude sludge, the extrusion body 33 is supported by the hydraulic damping rod 34 and stops moving. This increases the force on the sliding body 331 during the contact between the sliding body 331 and the inclined body 252, causing the sliding body 331 to continue moving downward, overcoming the resistance of the spring 333 to extrude the inclined structure of the moving plate 332 and move horizontally. This causes the moving plate 332 and the blade 334 to move horizontally. As the extrusion body 33 approaches the cleaning body 32, the blade 334 can extend and pierce the sludge, thereby further releasing the gas in the sludge and preventing the sludge from floating.

[0043] See Figure 3The cleaning body 32 includes a main body 322 and a collecting rod 323. The main body 322 is rotatably mounted on the surface of the water inlet substrate 2. The collecting rod 323 is fixedly mounted on the front section 231 of the main body 322 along the rotation direction. The collecting rod 323 is installed at an angle to the main body 322. During the sludge cleaning process, the collecting rod 323 can guide the sludge towards the center of the sedimentation tank through the angled inclination, so that it can be discharged through the discharge port opened in the center of the sedimentation tank, which is beneficial for the cleaning body 32 to clean and discharge the sludge.

[0044] See Figure 3 The collecting rod 323 is divided into a squeezing section 324 and an extension section 325. The extension section 325 is fixedly installed at the end of the squeezing section 324 near the side wall of the sedimentation tank, and the included angle of the extension section 325 is greater than that of the squeezing section 324. The squeezing section 324 and the squeezing body 33 are parallel to each other at the position closest to the cleaning body 32, so that the squeezing section 324 and the squeezing body 33 cooperate to perform light squeezing on the sludge, thereby slightly increasing the sludge density and expelling air from the sludge, thus preventing the sludge from floating and reducing suspended solids in the sedimentation tank. The included angle of the extension section 325 is greater than that of the squeezing section 324, which can increase the movement speed of the sludge towards the center of the sedimentation tank while maintaining the same speed, thereby improving the efficiency of sludge cleaning.

[0045] It should be noted that the length of the extrusion body 33 is the same as that of the extrusion section 324.

[0046] The middle section 232 is arranged at an angle perpendicular to the water inlet direction, and a sewage outlet is provided at its horizontal lower end. The angled middle section 232 facilitates the movement of sludge towards the sewage outlet, thereby facilitating sludge discharge. It should be noted that the specific operational methods for discharging and cleaning sludge from the sewage outlet are existing technologies and will not be elaborated upon here.

[0047] It should be noted that the sewage inflow, sludge discharge, and purified water discharge in the embodiments of this disclosure are all prior art, and will not be elaborated further here.

[0048] See Figure 10 This disclosure also provides a wastewater treatment system including the aforementioned wastewater treatment sedimentation tank. A pretreatment tank is connected in front of the wastewater treatment sedimentation tank, and a post-treatment tank and a sludge treatment tank are arranged in parallel behind the wastewater treatment sedimentation tank. The pretreatment tank is provided with multiple sets of screens along the wastewater flow direction, and the spacing of the multiple sets of screens decreases sequentially. The post-treatment tank includes an aeration tank and a biofilm reactor connected in parallel, and a parallel pipe connects the aeration tank and the biofilm reactor.

[0049] Multiple sets of grids with progressively decreasing spacing can filter impurities of different volumes in layers while ensuring filtration effectiveness, thereby avoiding reducing the pressure on the grid filtration and preventing the grid from becoming clogged when filtering impurities.

[0050] The parallel connection of the aeration tank and biofilm reactor allows for selection based on water quality, thereby improving wastewater treatment efficiency. A parallel pipeline connects the aeration tank and the biofilm reactor, enabling wastewater to be sequentially processed by both the aeration tank and the biofilm reactor after sedimentation, further enhancing wastewater treatment effectiveness.

[0051] It should be noted that the specific structures of the bar screen for intercepting impurities, the aeration tank, and the biofilm reactor are existing technologies and will not be elaborated upon here.

[0052] Work process: In the process of treating wastewater in the sedimentation tank, wastewater enters the inlet column 2 in the middle of the sedimentation tank through the inlet pipe at the bottom of the sedimentation tank. In the inlet column 2, the wastewater first enters the vertical wave-structured inlet energy dissipation section 21. This section slows down and eliminates the kinetic energy of the wastewater, thereby reducing the wastewater flow velocity and facilitating the sedimentation of solid impurities. After passing through the vertical wave-structured inlet energy dissipation section 21, the wastewater enters the horizontal flow section 22, and then from there enters the impurity interception section 23. In the impurity interception section 23, the solid impurities in the slow-flowing wastewater are located at the lower layer, causing the wastewater to overflow as it flows through the latter section 233. This allows the impurities in the wastewater to be intercepted and rolled down by their own weight into the middle section 232 for storage. This reduces the amount of impurities entering the sedimentation tank, thus improving the wastewater treatment efficiency of the sedimentation tank.

[0053] Furthermore, the width of the front section 231 is equal to or less than the shortest parallel side of the trapezoidal structure of the rear section 233. This allows sewage to enter the space expansion area as it flows from the front section 231 to the rear section 233. The rear section 233, with its trapezoidal structure, has a larger space than the front section 231, thus filling the expanded space and reducing the sewage flow velocity. This further improves the sedimentation effect of impurities while maintaining a constant sewage inflow rate, and reduces the kinetic energy of impurities, making them easier for the rear section 233 to trap and roll back to the middle section 232. The middle section 232, arranged at an angle perpendicular to the inlet direction, facilitates the movement of sludge towards the discharge outlet, thus facilitating sludge discharge.

[0054] During the process of sewage entering the sedimentation tank, after the drive motor 31 is started, the drive gear 311 on the output shaft meshes with the driven gear ring 321, driving the cleaning body 32 and the squeezing body 33 to rotate, thereby scraping away and cleaning the sludge at the bottom of the sedimentation tank. During the rotation of the cleaning body 32 and the squeezing body 33, the sliding body 331 above the squeezing body 33 contacts the inclined body 252 and drives the inclined body 252 and the moving wall 25 to move upward. After the moving wall 25 moves to the stop point, it connects the water inlet channel and the reagent chamber 24, so that the reagent in the reagent chamber 24 enters the water inlet channel and mixes with the sewage. In this way, the sedimentation effect of impurities in the sewage can be improved by adding reagents, thereby improving the sewage treatment effect of the sedimentation tank.

[0055] After the moving wall 25 reaches its stop point, it cannot move further. The inclined body 252 of the moving wall 25 blocks the sliding body 331 and the squeezing body 33. At this time, the spring 333 and the moving plate 332 exert force on the sliding body 331, keeping the sliding body 331 in place and preventing it from moving down. This causes the squeezing body 33 to stop rotating while the cleaning body 32 continues to rotate. As a result, the squeezing body 33 moves closer to the cleaning body 32 and works with the squeezing section 324 to lightly squeeze the sludge, thereby slightly increasing the sludge density and expelling air from the sludge, thus preventing the sludge from floating and reducing suspended solids in the sedimentation tank.

[0056] After the extrusion body 33 rotates and approaches the cleaning body 32 to extrude sludge, the extrusion body 33 stops moving due to the support of the hydraulic damping rod 34. This increases the force on the sliding body 331 during the contact between the sliding body 331 and the inclined body 252, causing the sliding body 331 to overcome the resistance of the spring 333 and the moving plate 332 and continue to move downward. This causes the inclined structure of the moving plate 332 to move horizontally, thereby driving the moving plate 332 and the blade 334 to move horizontally. As the extrusion body 33 approaches the cleaning body 32, the blade 334 can extend to extrude and pierce the sludge, further releasing the gas in the sludge, preventing the sludge from floating, which is beneficial to improving the sewage treatment effect of the sedimentation tank and improving the effluent quality.

[0057] The sludge in the sedimentation tank is collected by the cleaning body 32 and discharged using existing technology, while the clarified water is discharged through the existing slag baffles and triangular weirs around the perimeter via overflow.

[0058] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment sedimentation tank, comprising a tank body (1), an inlet substrate (2), and a cleaning assembly (3), wherein the inlet substrate (2) is fixedly installed at the center of the tank body (1), an inlet channel is provided inside the inlet substrate (2), and the cleaning assembly (3) is rotatably installed below the inlet substrate (2), characterized in that: The water inlet channel includes a water inlet energy dissipation section (21), a horizontal flow section (22), and an impurity interception section (23) connected sequentially along the water inlet direction. The water inlet energy dissipation section (21) is a vertically arranged wave structure, the horizontal flow section (22) is a horizontal structure, and the cross-section of the impurity interception section (23) is funnel-shaped. A reagent chamber (24) is opened on the side wall of the water inlet channel to connect with the water inlet channel. A movable wall (25) is vertically slidably installed near the side of the water inlet channel in the reagent chamber (24). A cleaning component (3) is rotatably installed below the water inlet substrate (2). The cleaning component (3) squeezes the movable wall (25) during rotation and intermittently connects the water inlet channel and the reagent chamber (24) to intermittently inject drugs. The cleaning component (3) moves relative to itself while squeezing the movable arm to squeeze and puncture the sludge. The cleaning assembly (3) includes a drive motor (31), a cleaning body (32), and an extrusion body (33). The drive motor (31) is fixedly installed below the pool body (1). A drive gear (311) is fixedly installed on the output shaft of the drive motor (31). An inlet pipe (11) for conveying sewage to the inlet substrate (2) is fixedly installed below the pool body (1). The cleaning body (32) is rotatably installed on the outside of the inlet pipe (11). A driven gear ring (321) is axially fixedly installed below the cleaning body (32). The drive gear (311) meshes with the driven gear ring (321). An extrusion body (33) is hinged to the surface of the cleaning body (32). A hydraulic damper (34) is hinged between the cleaning body (32) and the extrusion body (33). The impurity interception section (23) includes a front section (231), a middle section (232) and a rear section (233) that are fixedly connected in sequence along the water inlet direction. The horizontal height and length of the rear section (233) are both greater than those of the front section (231). The rear section (233) has a trapezoidal structure, and the width of the front section (231) is equal to or less than the shortest parallel side of the trapezoidal structure of the rear section (233). The surface of the movable wall (25) is provided with a connecting hole (251) that connects the water inlet channel and the reagent chamber (24). An inclined body (252) that intermittently contacts the cleaning body (32) is fixedly installed below the movable wall (25). The inclined body (252) passes through the water inlet substrate (2). A sliding body (331) with a matching inclined body (252) is slidably installed above the extrusion body (33). Both the upper and lower ends of the sliding body (331) are inclined structures. A moving plate (332) is slidably installed on the lower inclined structure side of the sliding body (331). The end of the moving plate (332) near the sliding body (331) is a matching inclined structure. Multiple blades (334) are fixedly installed on the surface of the moving plate (332). The blades (334) slide through the extrusion body (33). The cleaning body (32) includes a main body (322) and a collecting rod (323). The main body (322) is rotatably mounted on the surface of the water inlet substrate (2). The collecting rod (323) is fixedly mounted on the front section (231) of the main body (322) along the rotation direction. The collecting rod (323) is installed at an angle to the main body (322). The collecting rod (323) is divided into a squeezing section (324) and an extension section (325). The extension section (325) is fixedly installed at the end of the squeezing section (324) near the side wall of the sedimentation tank. The included angle of the extension section (325) is greater than that of the squeezing section (324). The middle section (232) is arranged at an angle with the vertical water inlet direction, and a sewage outlet is opened at the horizontal low end of the middle section (232).

2. A wastewater treatment system, characterized in that: The wastewater treatment sedimentation tank as described in claim 1 is provided with a pretreatment tank connected in front of it, and a posttreatment tank and a sludge treatment tank connected in parallel behind it. The pretreatment tank is provided with multiple sets of bar screens along the wastewater flow direction, and the spacing between the bar screens in the multiple sets of bar screens decreases sequentially. The posttreatment tank includes an aeration tank and a biofilm reactor connected in parallel, and a parallel pipeline connects the aeration tank and the biofilm reactor.

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