Super-efficient shallow air flotation machine for sewage treatment and treatment process

Abstract

The application discloses a kind of for sewage treatment ultra-efficient shallow air floaters and processing technology, its ultra-efficient shallow air floater includes pool body, cloth liquid unit, mounting bracket and drive unit, pool body inserts with sewage pipe and inlet pipe, sewage pipe is connected with sewage pipe, inlet pipe is connected with Venturi jet and is connected with its water inlet, the air pipe and the dissolved air water pipe are connected with the air inlet and the water outlet of Venturi jet respectively;Cloth liquid unit includes mixing pipe and cloth liquid pipe, mixing pipe is connected with sewage pipe, dissolved air water pipe, cloth liquid pipe is connected on mixing pipe, mounting bracket is arranged on sewage pipe, and mounting bracket is provided with scraper;Drive unit drives mounting bracket to rotate;Pool body is equipped with scum cylinder, scum cylinder is equipped with scum box, the height of front side box wall of scum box is greater than rear side box wall, mounting bracket is equipped with bending assembly for bending scraper, and the scraper after bending restores original shape after passing through low side box wall of scum box.The ultra-efficient shallow air floater provided by the application can improve the efficiency of the scraper to remove scum.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an ultra-efficient shallow air flotation machine and treatment process for wastewater treatment. Background Technology

[0002] Wastewater treatment refers to the process of purifying wastewater to meet the water quality requirements for discharge into a water body or for reuse. Wastewater treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscaping, medical care, and catering. Various equipment is used in the wastewater treatment process, among which dissolved air flotation (DAF) machines are one. A DAF machine uses a dissolved air system to generate a large number of microbubbles in water, causing air to adhere to suspended particles in the form of highly dispersed microbubbles. These microbubbles create a density less than water, allowing the particles to float on the surface using the principle of buoyancy, thus achieving solid-liquid separation in wastewater treatment.

[0003] Some existing shallow dissolved air flotation (DAF) machines have scrapers and collection tanks for collecting scum. The scrapers for removing scum are generally positioned at or above the surface of the wastewater. The scrapers themselves have limited effectiveness in removing scum. In order to prevent the inflow of wastewater, the walls of the collection tank must be higher than the surface of the liquid. This causes the scrapers to come into contact with the walls of the collection tank when they pass by, causing the scrapers to bend away from the collection tank. This makes it difficult for the scrapers to effectively push or scrape the scum into the collection tank, resulting in low efficiency in removing scum from the DAF machine and affecting the wastewater treatment efficiency. Summary of the Invention

[0004] This invention provides an ultra-efficient shallow air flotation machine and treatment process for wastewater treatment, which can improve the efficiency of the air flotation machine in removing scum and increase the speed of wastewater treatment.

[0005] The present invention provides an efficient shallow air flotation machine and treatment process for wastewater treatment, which adopts the following technical solution: An efficient shallow dissolved air flotation (DAF) machine for wastewater treatment includes a tank, a liquid distribution unit, a mounting frame, and a drive unit. A wastewater pipe and an inlet pipe are inserted in the middle of the tank. One end of the wastewater pipe is rotatably connected to a sludge pipe whose axis is parallel to the radial direction of the tank. The inlet pipe passes through the wastewater pipe, penetrates the sludge pipe, and is connected to a Venturi jet injector. The inlet pipe is connected to the inlet of the Venturi jet injector. The air inlet and outlet of the Venturi jet injector are respectively connected to an air pipe and a dissolved air water pipe. The liquid distribution unit includes a mixing pipe and a distribution pipe. The mixing pipe is connected to the sludge pipe and the dissolved air water pipe via a tee pipe. The mixing pipe is located below the sludge pipe. The distribution pipe is connected to the mixing pipe and flows into the tank. The distribution pipe has distribution holes. The mounting frame is mounted on the sludge pipe and has scrapers parallel to the radial direction of the tank. The drive unit is located between the mounting frame and the tank and is used to drive the mounting frame to rotate around the central axis of the tank. The pool is equipped with a scum cylinder and a rotating cylinder that are coaxial with the pool body. The bottom of the scum cylinder is connected to a scum discharge pipe leading to the outside of the pool body. A scum box is provided on the scum cylinder. The two side walls of the scum box are parallel to the radial direction of the pool body. In the rotation direction of the mounting frame, the height of the front side wall of the scum box is greater than the height of its rear side wall. The rotating cylinder is sleeved on the outside of the scum cylinder and is rotatably connected to the pool body. A clean water pipe is connected to the side wall of the rotating cylinder. A water collection hole is opened on the clean water pipe. The bottom of the rotating cylinder is connected to an external water collection device through a water outlet pipe. The mounting frame is equipped with a bending assembly for bending the scraper in the direction of rotation of the mounting frame. The bent scraper can pass through the lower side wall of the scum box as the mounting frame rotates, and returns to its original shape before rotating to the upper side wall of the scum box. The liquid level of the wastewater and dissolved air water mixture introduced into the tank through the liquid distribution pipe is located below the top of the two side walls of the scum box.

[0006] Furthermore, a drain hole is provided at the bottom of the pool body, the length direction of which is parallel to the radial direction of the pool body, and a drain pipe connected to the drain hole is provided at the bottom of the pool body; a drain rod parallel to the radial direction of the pool body is fixed at one end of the liquid distribution pipe that extends into the pool body, and the drain rod is in contact with the inner bottom surface of the pool body.

[0007] Furthermore, the drive unit includes a motor and a drive wheel. The motor is mounted on the mounting frame, and the drive wheel is rotatably mounted on the mounting frame. The surface of the drive wheel abuts against the top end face of the pool body. A drive wheel is mounted on the output shaft of the motor, and the drive wheel drives the drive wheel to rotate through a transmission belt. When the drive wheel moves along the top end face of the pool body, the drive wheel drives the mounting frame to rotate around the central axis of the pool body.

[0008] Furthermore, the rotating drum includes a rotating part and a fixed part. The rotating part is rotatably disposed on the inner bottom surface of the pool body, the clear water pipe is fixed on the side wall of the rotating part, the fixed part is rotatably connected to the top of the rotating part, and the fixed part is fixedly connected to the scum box. The fixed part is used to prevent sewage and dissolved air water mixture in the pool body from flowing into the rotating drum.

[0009] Furthermore, the bending assembly includes a rotating rod, a first pull rope, a lever, a deflector, and a stop bar. The rotating rod is rotatably mounted on the mounting frame, and its axial direction is parallel to the length direction of the scraper. The lever is fixed to the rotating rod. One end of the first pull rope is connected to the end of the lever away from the rotating rod, and the other end is connected to the side of the scraper away from the mounting frame. The deflector is fixed to the side of the rotating rod facing the central axis of the pool. The stop bar is fixed to the rod wall through which the inlet pipe passes through the drain pipe. As the mounting frame rotates axially around the rotating cylinder with the drain pipe, the deflector can abut against the stop bar. When the deflector abuts against the stop bar and the mounting frame continues to rotate, the deflector drives the rotating rod to rotate, causing the first pull rope to bend the scraper in the direction of the mounting frame's rotation.

[0010] Furthermore, the scraper is provided in multiple pieces, which are distributed at equal angles around the central axis of the pool on the bottom surface of the mounting frame. A second pull rope is connected between adjacent scrapers, and the second pull rope is in a slack state.

[0011] Furthermore, the water pipe is provided in multiple parts, and the axial direction of each water pipe is parallel to the radial direction of the pool body. The water pipes are spaced apart from the bottom surface of the pool body, and the water pipes are close to the bottom surface of the pool body on the rotating drum.

[0012] Furthermore, the liquid distribution pipe is provided with multiple liquid distribution pipes, which are evenly distributed along the axial direction of the mixing pipe, and the axial direction of the liquid distribution pipes is perpendicular to the axial direction of the mixing pipe.

[0013] A wastewater treatment process, applied in the aforementioned high-efficiency shallow air flotation unit, includes the following steps: Step 1: Sewage, clean water, and air are respectively introduced into the sewage pipe, the water inlet pipe, and the air inlet pipe, so that the mixed liquid in the mixing pipe flows into the pool body through the distribution hole on the distribution pipe; Step 2: Drive the mounting frame to rotate around the central axis of the pool body through the drive unit. When the mounting frame rotates, the scraper bends to one side of the rotation direction through the bending assembly to scoop up the scum mixture in the pool body. After scooping up the scum mixture, the scraper rotates between the two side walls of the scum box and returns to its original shape, so that the scum mixture scooped up by the scraper is poured into the scum box. Step 3: When the scraper rotates to the high side wall of the scum box, the scraper is bent in the opposite direction of rotation by the counter-pushing force of the high side wall, so that the scum mixture adhering to the side of the scraper facing the direction of rotation is scraped off by the wall of the scum box and into the scum box. Step 4: When the mounting frame rotates, the water pipe rotates accordingly, which is used to flow the water in the pool into the rotating drum through the water pipe, and then transport it to the external water collection device through the water outlet pipe.

[0014] Furthermore, in steps two and three, the scum mixture in the scum box flows into the scum cylinder and flows out of the pool through the scum discharge pipe connected to the bottom of the scum cylinder.

[0015] The beneficial effects of this invention are: The present invention provides an ultra-efficient shallow air flotation machine for sewage treatment, in which water introduced into the inlet pipe and air passing through the air pipe can mix in the Venturi jet to form dissolved air water, which flows into the tank through the dissolved air water pipe, and the dissolved air water and sewage are mixed to achieve solid-liquid separation of sewage. The scraper can rotate in the pool with the mounting frame. During the rotation of the scraper, it can push the scum in the pool towards the scum box. Under the action of the bending component, the scraper can bend in the direction of rotation of the mounting frame, so that the scum accumulated on one side of the scraper rotation direction is scooped out of the mixture of sewage and dissolved air water by the bent scraper. After the scraper enters the area between the two side walls of the scum box, the scraper returns to its original shape, so that the scum scooped up by the scraper falls into the scum box, realizing the collection of scum. Compared with the existing operation of forcibly pushing scum into the scum box with a scraper, it not only has a higher scum removal efficiency but also causes less damage to the scum box and the scraper, which can make the invention have a longer service life. Moreover, when the scraper passes over the high side wall of the scum box, the top of the high side wall can scrape off the scum and other impurities that are stuck to the scraper on the side facing its rotation direction and let them fall into the scum trough, thus preventing the scum and other impurities stuck to the scraper from re-entering the pool and achieving further cleaning of scum and garbage in the pool. Furthermore, the drain rod can clean the bottom surface of the pool as it rotates with the liquid distribution pipe, pushing the sludge and other impurities that have settled on the bottom surface of the pool to the drain hole, making the clean water discharged from the pool through the clean water pipe cleaner. Furthermore, in the rotation direction of the mounting frame, when the scraper passes the high side wall of the scum box, it can drive the adjacent scraper behind it to bend in the rotation direction of the mounting frame through the second pull rope, thereby realizing the collection of scum in the pool by the adjacent scrapers, and thus realizing the cleaning of scum in the pool by all scrapers. Except for the scraper on the frontmost side, the remaining scrapers are automatically bent by the second pull rope. The linkage structure between multiple scrapers is simple and low cost.

[0016] The present invention provides a wastewater treatment process that is applied to the aforementioned high-efficiency shallow air flotation machine. The process steps are clear and straightforward, and the aforementioned high-efficiency shallow air flotation machine can treat wastewater according to this process. Attached Figure Description

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

[0018] Figure 1 This is a schematic diagram of the structure of an ultra-efficient shallow air flotation machine for wastewater treatment provided in an embodiment of the present invention; Figure 2 A side view of an ultra-efficient shallow air flotation machine for wastewater treatment provided in an embodiment of the present invention; Figure 3 A top view of an ultra-efficient shallow air flotation machine for wastewater treatment provided in an embodiment of the present invention; Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure along the AA direction; Figure 5 for Figure 4 A magnified structural diagram of part B in the middle section; Figure 6 This is a schematic diagram of the structure of a high-efficiency shallow air flotation machine for sewage treatment provided in an embodiment of the present invention, showing the actuating plate abutting against the stop bar. Figure 7 for Figure 6 A magnified structural diagram of section C; Figure 8 This is a top view of a high-efficiency shallow air flotation machine for sewage treatment provided in an embodiment of the present invention, showing the actuating plate abutting against the stop bar. Figure 9 for Figure 8 A schematic diagram of the cross-sectional structure along the DD direction; Figure 10 for Figure 9 A magnified structural diagram of section E in the middle; Figure 11 This is a top view of a super-efficient shallow air flotation machine for wastewater treatment provided in an embodiment of the present invention, showing the scraper passing over the high side wall of the scum box; Figure 12 for Figure 11 A schematic diagram of the cross-sectional structure along the FF direction; Figure 13 for Figure 12 A magnified structural diagram of section G in the middle; Figure 14 This is a schematic diagram of the mounting frame in an ultra-efficient shallow air flotation machine for wastewater treatment provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of the connection structure between multiple scrapers in an ultra-efficient shallow air flotation machine for sewage treatment, provided as an embodiment of the present invention.

[0019] In the diagram: 100, pool body; 110, sewage pipe; 120, inlet pipe; 130, drain pipe; 140, Venturi jet injector; 150, air pipe; 160, dissolved air water pipe; 170, scum cylinder; 171, scum discharge pipe; 172, scum box; 1721, lower side wall; 1722, upper side wall; 180, rotating drum; 181, rotating part; 1811, clear water pipe; 1812, outlet pipe; 182, fixed. Components: 190, drain hole; 191, drain pipe; 200, liquid distribution unit; 210, mixing pipe; 220, liquid distribution pipe; 221, drain rod; 300, mounting bracket; 310, scraper; 400, drive unit; 410, motor; 420, drive wheel; 500, tee pipe; 610, rotating rod; 620, first pull rope; 630, lever; 640, actuating plate; 650, stop bar; 700, second pull rope. Detailed Implementation

[0020] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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 limiting the invention.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] like Figures 1 to 15 As shown in the figure, an embodiment of the present invention provides an ultra-efficient shallow air flotation machine for sewage treatment, comprising a tank body 100, a liquid distribution unit 200, a mounting frame 300, and a drive unit 400. The tank body 100 has a cylindrical structure, and a steel structure support is installed at the bottom of the tank body 100. A sewage pipe 110 and an inlet pipe 120 are inserted in the middle of the tank body 100.

[0024] The sewage pipe 110 includes a horizontal section and a vertical section, which are connected in a zigzag shape. The horizontal section of the sewage pipe 110 is connected to the sewage source, and the vertical section of the sewage pipe 110 is inserted into the tank body 100 and rotatably connected to a drain pipe 130 whose axial direction is parallel to the radial direction of the tank body 100. One end of the drain pipe 130 has a swivel, one end of which is rotatably connected to the end of the sewage pipe 110 inserted into the tank body 100, and the other end of the swivel is a closed end. The end of the drain pipe 130 away from the swivel extends towards the side away from the central axis of the tank body 100.

[0025] One end of the inlet pipe 120 is connected to an external water supply pump, and the other end is inserted into the vertical section of the sewage pipe 110 and passes through the swivel closed end of the sewage pipe 130. The end of the inlet pipe 120 that passes through the sewage pipe 130 is connected to a Venturi jet injector 140. The inlet of the Venturi jet injector 140 is fixedly connected to the end of the inlet pipe 120 that passes through the top of the swivel. The air inlet and water outlet of the Venturi jet injector 140 are respectively connected to an air pipe 150 and a dissolved air water pipe 160. The end of the air pipe 150 away from the Venturi jet injector 140 is connected to an external air supply pump.

[0026] Water inlet pipe 120 and air inlet pipe 150 respectively introduce clean water and air into the water inlet and air inlet of Venturi jet 140. The clean water and air can mix in Venturi jet 140 to form dissolved air water. The dissolved air water is introduced to the pool body 100 through dissolved air water pipe 160. The axis of dissolved air water pipe 160 is parallel to the axis of sewage pipe 130, and the dissolved air water pipe 160 is located above sewage pipe 130.

[0027] It should be noted that before the water inlet pipe 120 introduces clean water into the inlet of the Venturi jet 140, a certain amount of flocculant can be added to the clean water in advance. Then, the clean water with flocculant added is introduced into the Venturi jet 140 so that it can be mixed with the air introduced into the Venturi jet 140 to form dissolved air water.

[0028] The liquid distribution unit 200 includes a mixing pipe 210 and a distribution pipe 220. The mixing pipe 210 is connected to the drain pipe 130 and the dissolved air water pipe 160 via a tee pipe 500, and is located below the drain pipe 130. The tee pipe 500 is an "E"-shaped fitting, with two ends connected to the drain pipe 130 and the dissolved air water pipe 160 respectively, and the other end connected to the mixing pipe 210. The mixing pipe 210 is parallel to the axis of the drain pipe 130. The distribution pipe 220 is connected to the mixing pipe 210, and its axis is perpendicular to the axis of the mixing pipe 210. The end of the distribution pipe 220 away from the mixing pipe 210 leads to the bottom of the tank body 100. Multiple distribution pipes 220 can be provided, and they are evenly distributed along the axis of the mixing pipe 210. Multiple liquid distribution pipes 220 are provided with liquid distribution holes. The multiple liquid distribution holes are evenly distributed on the liquid distribution pipes 220 along the axial direction of the liquid distribution pipes 220.

[0029] The mounting bracket 300 is installed on the drain pipe 130 and located above the pool body 100. The mounting bracket 300 can be a fan-shaped frame coaxial with the pool body 100. A scraper 310 with its length direction parallel to the radial direction of the pool body 100 is fixed at the bottom of the mounting bracket 300. The scraper 310 can be a rubber plate with a certain degree of elasticity, and the end of the scraper 310 away from the mounting bracket 300 extends into the pool body 100.

[0030] The drive unit 400 is disposed between the mounting bracket 300 and the pool body 100. Specifically, it can be between the arc-shaped end of the mounting bracket 300 away from the central axis of the pool body 100 and the top of the corresponding side plate of the pool body 100. The drive unit 400 is used to drive the mounting bracket 300 to rotate around the central axis of the pool body 100.

[0031] The pool body 100 is equipped with a scum cylinder 170 and a rotating cylinder 180 coaxial with the pool body 100. The scum cylinder 170 is fixed to the inner bottom surface of the pool body 100, and a scum discharge pipe 171 leading to the outside of the pool body 100 is connected to the bottom of the scum cylinder 170. A scum box 172 is installed on the scum cylinder 170. The two side walls of the scum box 172 are parallel to two radii of the cross-section of the pool body 100, respectively. In the rotation direction of the mounting frame 300, the height of the front wall of the scum box 172 is greater than the height of the rear wall. The rotating cylinder 180 is sleeved on the outside of the scum cylinder 170 and rotatably connected to the inner bottom surface of the pool body 100. A clear water pipe 1811 is connected to the side wall of the rotating cylinder 180. The axial direction of the clear water pipe 1811 is parallel to the radial direction of the pool body 100, and the clear water pipe 1811 is located on the side wall of the rotating cylinder 180 close to the inner bottom surface of the pool body 100.

[0032] Multiple water pipes 1811 are evenly arranged around the axis of the rotating drum 180. Each water pipe 1811 has multiple water collection holes facing the inner bottom surface of the pool body 100. The multiple water collection holes are evenly distributed along the axis of the water pipes 1811. A water outlet pipe 1812 leading to the outside of the pool body 100 is connected to the bottom of the rotating drum 180. The end of the water outlet pipe 1812 away from the rotating drum 180 is connected to an external water collection device.

[0033] The mounting frame 300 is provided with a bending assembly, which is used to bend the scraper 310 in the direction of rotation of the mounting frame 300. When the bent scraper 310 rotates with the mounting frame 300, it can pass through the lower side wall 1721 of the scum box 172 and return to its original shape before rotating to the higher side wall 1722 of the scum box 172. The liquid level of the wastewater and dissolved air water mixture introduced into the tank 100 through the liquid distribution pipe 220 is located below the top of the two side walls of the scum box 172.

[0034] The operating principle of this invention is as follows: First, wastewater to be treated and clean water are introduced into the sewage pipe 110 and the inlet pipe 120 respectively by different water pumps. At the same time, air is introduced into the air pipe 150 by an air pump. The wastewater introduced into the sewage pipe 110 flows to the tee pipe 500 through the sewage pipe 130. The clean water and air are introduced into the Venturi jet 140 through the inlet pipe 120 and the air pipe 150. Dissolved air water is formed at the outlet of the Venturi jet 140. The dissolved air water flows to the tee pipe 500 through the dissolved air water pipe 160. The wastewater flowing into the tee pipe 500 and the dissolved air water pipe 160 mix and can flow out from the mixing pipe 210 connected to the tee pipe 500, and then flow into the pool body 100 from the distribution hole of the distribution pipe 220. When the liquid level of the sewage and dissolved air water mixture in the tank 100 is between the bottom of the scraper 310 and the top of the lower side wall 1721 of the scum box 172, the drive unit 400 drives the mounting frame 300 to rotate around the central axis of the tank 100. When the mounting frame 300 rotates, it drives the drain pipe 130 and the scraper 310 to rotate synchronously. During the rotation of the mounting frame 300, the scraper 310 can be bent in the direction of rotation of the mounting frame 300 under the action of the bending assembly, and the bent scraper 310 can pass over the lower side wall 1721 of the scum box 172 and enter the area between the two side walls of the scum box 172. As the scraper 310 continues to rotate with the mounting frame 300 in the area between the two side walls of the scum box 172, the bent scraper 310 can return to its original shape. After the scraper 310 returns to its original shape, as it continues to rotate with the mounting frame 300, the end of the high side wall 1722 of the scum box 172 can abut against the scraper 310, causing the scraper 310 to bend in the direction away from the rotation of the mounting frame 300. After the scraper 310 passes the high side wall 1722 of the scum box 172, it returns to its original shape. As the scraper 310 rotates around the central axis of the tank 100 with the mounting frame 300, it can push the scum in the tank 100 toward the direction closer to the scum box 172. During the process of pushing the scum to move, under the action of the bending component, the scraper 310 bends toward the rotation direction of the mounting frame 300, so that the scum accumulated on one side of the rotation direction of the scraper 310 is scooped out from the sewage and dissolved air water mixture in the tank 100 by the bent scraper 310. As the scraper 310 rotates between the two side walls of the scum box 172, the bending component can release the bending of the scraper 310. The released scraper 310 can pour the scum it scoops into the scum box 172, and then flow into the scum cylinder 170 through the scum box 172, thereby realizing the collection of scum in the pool 100. Since the mixed liquid introduced into the tank 100 is a mixture of sewage and dissolved air water, the dissolved air water can efficiently adsorb impurity particles in the sewage and reduce the density of the impurity particles. The impurity particles with reduced density float to the surface, thereby achieving solid-liquid separation of sewage. At the same time, the dissolved air water can also efficiently adsorb emulsions in the sewage, which greatly reduces the oil content in the sewage. Finally, the oil and impurity particles form scum that floats on the water surface. The purified water can flow into the rotating drum 180 through the water collection hole on the clear water pipe 1811, and then out of the tank 100 through the water outlet pipe 1812 connected to the rotating drum 180. The water flowing out of the tank 100 through the water outlet pipe 1812 can be reused multiple times as water introduced into the water inlet pipe 120, which can reduce water waste.

[0035] In this invention, the scraper 310 fixed below the mounting frame 300 can be immersed below the liquid surface of the pool 100. As the mounting frame 300 rotates, the scraper 310 can bend towards its rotation direction under the action of the bending assembly. The bent scraper 310 can scoop up the scum accumulated on one side of the scraper 310, and after scooping up the scum, it moves between the two side walls of the scum box 172. When the scraper 310 rotates between the two side walls of the scum box 172... Under the action of the bending component, the scraper 310 returns to its original shape. The scraper 310, which has returned to its original shape, continues to rotate under the drive of the mounting frame 300. When the scraper 310 passes the high side wall 1722 on the scum box 172, the scraper 310 abuts against the corresponding box wall. The end of the corresponding box wall can scrape off the impurities and garbage adhering to one side of the rotation direction of the scraper 310 and let them fall into the scum box 172, thereby realizing the cleaning of the scum in the pool 100 by the scraper 310.

[0036] In this invention, since the scraper 310 scoops up the scum by bending before rotating into the scum box 172, and the scraper 310 can pass directly over the lower side wall 1721 of the scum box 172 and enter the scum box 172 after bending, compared with the existing operation of the forced scraper 310 pushing the scum into the scum box 172, the scum removal efficiency is higher and the damage to the scum box 172 and the scraper 310 is less, which makes the invention have a longer service life.

[0037] It should be noted that this invention utilizes the zero-speed principle found in existing air flotation machines. Specifically, in this invention, the orientation of the liquid distribution holes is opposite to the rotation direction of the mounting frame 300 on the tank body 100. The rotation speed of the mounting frame 300 on the tank body 100 is controlled by the drive unit 400, thereby ensuring that the liquid inflow speed of the liquid distribution holes in the tank body 100 is consistent with the liquid outflow speed of the water collection holes on the clear water pipe 1811. This creates a "zero-speed zone" in the tank body 100, keeping the liquid in the tank body 100 relatively still. This is more conducive to the combination of dissolved air water with suspended particles and emulsions in the wastewater, making it easier for scum to float in the tank body 100 and facilitating the cleaning of scum by the scraper 310.

[0038] Furthermore, a drain hole 190 is provided at the bottom of the pool body 100. The length direction of the drain hole 190 is parallel to the radial direction of the pool body 100. A drain pipe 191 communicating with the drain hole 190 is connected to the bottom of the pool body 100. A drain rod 221 parallel to the radial direction of the pool body 100 is fixed at one end of the liquid distribution pipe 220 that extends into the pool body 100. The drain rod 221 contacts the inner bottom surface of the pool body 100.

[0039] In this embodiment, the drain hole 190 is located on the bottom surface of the pool body 100, between the side wall of the rotating cylinder 180 and the side wall of the pool body 100. The drain hole 190 can be a conical hole with a rectangular opening at its larger end and a round opening at its smaller end. The rectangular opening is located between the outer side wall of the rotating cylinder 180 and the inner side wall of the pool body 100, and the length direction of the rectangular opening is parallel to the radial direction of the pool body 100. The round opening is connected to a sludge discharge pipe for transporting the sediment entering the drain hole 190 to the outside of the pool body 100.

[0040] The discharge rod 221 is a rod parallel to the mixing pipe 210 in its length direction. The discharge rod 221 can rotate synchronously with the liquid distribution pipe 220 around the central axis of the tank body 100. When the discharge rod 221 rotates, it will push the sludge and other impurities settled on the bottom surface of the tank body 100. When the sludge and other impurities are pushed to the discharge hole 190, they can enter the sludge discharge pipe through the discharge hole 190, so as to clean the settled sludge in the tank body 100. This greatly reduces the sediment in the tank body 100 and helps to improve the cleanliness of the clean water discharged from the clear water pipe 1811.

[0041] In some embodiments, the drive unit 400 includes a motor 410 and a drive wheel 420. The motor 410 is mounted on the mounting frame 300, and the drive wheel 420 is rotatably mounted on the mounting frame 300. The wheel surface of the drive wheel 420 abuts against the top end face of the pool body 100. A drive wheel is mounted on the output shaft of the motor 410, and the drive wheel drives the drive wheel 420 to rotate through a transmission belt. When the drive wheel 420 moves along the top end face of the pool body 100, the drive wheel 420 drives the mounting frame 300 to rotate around the central axis of the pool body 100.

[0042] Specifically, the motor 410 can be a servo motor 410 or a stepper motor 410, which is more conducive to controlling the speed and direction of rotation, so that the liquid inlet speed of the liquid distribution hole in the pool 100 is consistent with the liquid outlet speed of the water collection hole on the clear water pipe 1811, so as to form a "zero speed zone" in the pool 100 and ensure the stable implementation of the present invention.

[0043] Furthermore, the rotating drum 180 includes a rotating part 181 and a fixed part 182. Both the rotating part 181 and the fixed part 182 are cylindrical structural components. The rotating part 181 is rotatably connected to the inner bottom surface of the pool body 100, and the fixed part 182 is rotatably connected to the top of the rotating part 181. The fixed part 182 and the rotating part 181 are sealed together.

[0044] Specifically, multiple clean water pipes 1811 are fixed to the side wall of the rotating part 181, and the fixing part 182 is fixedly connected to the scum box 172. Specifically, one end of the scum box 172 facing the central axis of the pool body 100 passes through the side wall of the fixing part 182 and extends into the scum cylinder 170. The end of the fixing part 182 away from the rotating part 181 is located above the liquid surface of the pool body 100, which can prevent sewage, dissolved air water mixture and impurities such as scum in the pool body 100 from flowing into the rotating cylinder 180, thereby realizing solid-liquid separation of sewage.

[0045] In some embodiments, the bending assembly includes a rotating rod 610, a first pull rope 620, a lever 630, a toggle piece 640, and a stop bar 650. The rotating rod 610 is rotatably mounted on the mounting bracket 300, and the axial direction of the rotating rod 610 is parallel to the length direction of the scraper 310. The lever 630 is fixed to the rotating rod 610. One end of the first pull rope 620 is connected to the end of the lever 630 away from the rotating rod 610, and the other end is connected to the end of the scraper 310 away from the mounting bracket 300. The toggle piece 640 is fixed to the end of the rotating rod 610 facing the central axis of the pool body 100, and the stop bar 650 is fixed to the rod wall through which the water inlet pipe 120 passes through the sewage pipe 130.

[0046] As the mounting bracket 300 rotates axially around the rotating drum 180 with the drain pipe 130, the actuating plate 640 can abut against the stop bar 650. When the actuating plate 640 abuts against the stop bar 650 and the mounting bracket 300 continues to rotate, the first pull rope 620 fixed on the rotating rod 610 can drive the scraper 310 to bend in the direction of rotation of the mounting bracket 300.

[0047] Specifically, in the rotation direction of the mounting bracket 300, the rotating rod 610 is located on the side of the mounting bracket 300 facing its rotation direction, and the scraper 310 is at the bottom of the mounting bracket 300 and close to the rotating rod 610. Multiple levers 630 are provided on the rotating rod 610, and these levers 630 are evenly distributed along the axial direction of the rotating rod 610. The length direction of each lever 630 is perpendicular to the axial direction of the rotating rod 610. Multiple first pull ropes 620 are provided, and each first pull rope 620 is fixedly connected to one of the levers 630. The ends of each first pull rope 620 away from the corresponding lever 630 are connected to the side of the scraper 310 away from the mounting bracket 300. The levers 630 can cause the scraper 310 to bend via the first pull ropes 620.

[0048] The stop bar 650 can be an L-shaped rod fixed to the water inlet pipe 120, with its bent portion away from the water inlet pipe 120. The actuating plate 640 is fixed to one end of the rotating rod 610 facing the central axis of the pool body 100. During the rotation of the mounting frame 300, the actuating plate 640 can always abut against the stop bar 650. When the actuating plate 640 abuts against the stop bar 650 and the mounting frame 300 continues to rotate, the actuating plate 640 can drive the rotating rod 610 to rotate, the rotating rod 610 drives the lever 630 to rotate, and the lever 630 drives the scraper 310 to bend the end away from the mounting frame 300 in the direction of rotation of the mounting frame 300 through the first pull rope 620, so that the scraper 310 can form a plate with a J-shaped cross section. The J-shaped plate can scoop up the floating scum in the pool 100. When the agitator 640 passes around the baffle 650, the scraper 310 can rotate between the two side walls of the scum box 172 and return to its original shape due to the elasticity of the scraper 310 itself.

[0049] When the scraper 310 returns to its original position, it can pour the scum it scooped up into the scum box 172, thereby collecting the scum in the pool 100. As the mounting frame 300 continues to rotate on the pool 100, each time the scraper 310 passes through the scum box 172, it can pour the scum it scooped up into the scum box 172, thus cleaning the scum in the pool 100.

[0050] Compared to the existing method of forcefully pushing scum into the scum box 172 using a scraper 310, in this embodiment, the scraper 310 can be bent into a J-shaped plate by the first pull rope 620 before rotating to the scum box 172. This allows the scraper 310 to scoop up the scum pushed by the scraper 310. The bent scraper 310 can pour the scum into the scum box 172 without pushing the lower side wall 1721 of the scum box 172. Compared to the existing method of forcefully pushing scum into the scum box 172 using a scraper 310, this method not only causes less damage to the scum box 172, but also prevents the scraper 310 from being blocked by the lower side wall 1721 when passing through it. This makes the scraper 310 clean the scum in the pool 100 more thoroughly and with higher cleaning efficiency.

[0051] Furthermore, multiple scraper blades 310 are provided, and the multiple scraper blades 310 are distributed at equal angles around the central axis of the pool body 100 on the bottom surface of the mounting frame 300. A second pull rope 700 is connected between adjacent scraper blades 310, and the second pull rope 700 is in a slack state.

[0052] Specifically, the two ends of the second pull rope 700 are respectively connected to two adjacent scraper blades 310, and each is fixedly connected to the end of the corresponding scraper blade 310 away from the mounting frame 300. Multiple second pull ropes 700 are provided between two adjacent scraper blades 310, and the multiple second pull ropes 700 are evenly distributed along the length direction of the scraper blade 310.

[0053] In the rotation direction of the mounting frame 300, when the scraper 310 passes the high side wall 1722 of the scum box 172, the high side wall 1722 of the scum box 172 can push the scraper 310 in the opposite direction to the rotation direction of the mounting frame 300 and bend it in the opposite direction. When bending, the second pull rope 700 drives the other scraper 310 on its rear side to bend in the rotation direction of the mounting frame 300, thereby causing the two adjacent scrapers 310 to bend in a direction closer to each other.

[0054] As the scraper 310 passes through the high side wall 1722 of the scum box 172, the second pull rope 700 connected to the scraper 310 gradually straightens and begins to apply tension to the adjacent scraper 310 behind it. The adjacent scraper 310 behind it begins to bend in the direction of rotation of the mounting frame 300 under the tension of the second pull rope 700, and gradually passes through the low side wall 1721 of the scum box 172. When scraper 310 passes the high side wall 1722 of scum box 172, the other scraper 310 adjacent to it has passed the low side wall 1721 of scum box 172 after bending and entered between the two side walls of scum box 172. After the scraper 310 passes through the high side wall 1722 of the scum box 172, it can return to its original shape in a short time under the action of the recovery elasticity of the scraper 310. The tension of the adjacent scraper 310 on the rear side decreases instantaneously, and it will also return to its original shape in a short time. When the two adjacent scrapers 310 have returned to their original shape, the second pull rope 700 between the two scrapers 310 rests on the top of the high side wall 1722 of the scum box 172 and is in a taut state. Subsequently, the scrapers 310 located between the two side walls of the scum box 172 will repeat the above actions until all the scrapers 310 on the mounting frame 300 have passed through the scum box 172. Each scraper 310 can pour the scum scooped up by the scraper 310 into the scum box 172 when it passes through the scum box 172. Multiple scrapers 310 can clean the scum in the pool 100 more quickly, making the scum cleaning efficiency of the present invention higher and more conducive to achieving solid-liquid separation of sewage.

[0055] In addition, when the mounting frame 300 rotates, in its rotation direction, the rotating rod 610 only needs to drive the scraper 310 at the front of the mounting frame 300 to bend through the lever 630 and the first pull rope 620. The scrapers 310 located after the front scraper 310 can be automatically bent by the second pull rope 700 when the front scraper 310 passes the scum box 172. The linkage structure between multiple scrapers 310 is simple and low in cost.

[0056] The second pull rope 700 ensures that the multiple scrapers 310 are bent when passing the lower side wall 1721 of the scum box 172, and that the bent scrapers 310 return to their original shape after entering between the two side walls of the scum box 172. This allows the mounting bracket 300 to rotate, causing the multiple scrapers 310 to bend via the first pull rope 620 and the second pull rope 700. When the scrapers 310 bend, they can scoop up the scum floating on the surface of the liquid in the pool 100. When the scrapers 310 rotate between the two side walls of the scum box 172, the first pull rope 620 and the second pull rope 700 are no longer under force, the scrapers 310 no longer bend, and the scum scooped up by the scrapers 310 slides into the scum box 172, achieving the collection of scum in the pool 100 and facilitating solid-liquid separation of wastewater.

[0057] Of course, before wastewater treatment, some testing instruments can be used to measure the impurity content in the wastewater, and the number of scrapers 310 can be adjusted appropriately according to the impurity content. For example, when the impurity content in the wastewater is low, fewer scrapers 310 are set, which is more conducive to the rotation of the scrapers 310 in the tank 100. Compared with more scrapers 310, fewer scrapers 310 rotate faster in the tank 100, thus enabling faster removal of scum in the tank 100 and improving the scum removal efficiency.

[0058] A wastewater treatment process, applied in the aforementioned high-efficiency shallow air flotation unit, includes the following steps: Step 1: Sewage, clean water and air are introduced into sewage pipe 110, water inlet pipe 120 and air pipe 150 respectively, so that the mixed liquid in mixing pipe 210 flows into pool body 100 through the distribution hole on distribution pipe 220.

[0059] Specifically, a sewage pump is installed at the sewage source, a water purification pump is installed at the water purification source, and an air pump is installed at the air source. Sewage, water purification, and high-pressure air are introduced into the sewage pipe 110, water inlet pipe 120, and air pipe 150 respectively through the sewage pump, water purification pump, and air pump. After passing through the sewage pipe 110 and the sewage pipe 130, the sewage enters the tee pipe 500. The water purification and high-pressure air are mixed in the Venturi jet 140 to form dissolved air water. The dissolved air water enters the tee pipe 500 through the dissolved air water pipe 160. The sewage and dissolved air water are mixed in the tee pipe 500 and flow to another pipe connected to the tee pipe 500, namely the mixing pipe 210. Then, the water flows into the pool body 100 through the liquid distribution pipe 220 connected in the mixing pipe 210.

[0060] Step 2: Drive the mounting frame 300 to rotate around the central axis of the pool body 100 via the drive unit 400. When the mounting frame 300 rotates, the scraper 310 bends to one side of the rotation direction via the bending assembly to scoop up the scum mixture in the pool body 100. After scooping up the scum mixture, the scraper 310 rotates to the space between the two side walls of the scum box 172 and returns to its original shape, so that the scum mixture scooped up by the scraper 310 is poured into the scum box 172.

[0061] Specifically, before the scraper 310 rotates to the scum box 172, the actuating plate 640 connected to the rotating rod 610 can abut against the stop bar 650 connected to the water inlet pipe 120. As the mounting frame 300 continues to rotate, the actuating plate 640 drives the rotating rod 610 to rotate. The rotating rod 610 can drive the scraper 310 to bend to the side of its rotation through the lever 630 and the first pull rope 620, thereby scooping up the scum pushed by the scraper 310 and realizing the collection of scum. When the scraper 310 passes the scum box 172, the actuating plate 640 can bypass the stop bar 650, thereby making the scraper 310 return to its original state, realizing the collection and cleaning of scum in the pool 100 by the scraper 310.

[0062] Step 3: When the scraper 310 rotates to the high side wall 1722 of the scum box 172, the scraper 310 is bent in the opposite direction of rotation, so that the scum mixture adhering to the side of the scraper 310 facing the direction of rotation is scraped off by the wall of the scum box 172 and placed inside the scum box 172.

[0063] Step 4: When the mounting bracket 300 rotates, the clean water pipe 1811 rotates accordingly, which is used to flow the clean water in the pool 100 into the rotating drum 180 through the clean water pipe 1811, and then transport it to the external water collection device through the water outlet pipe 1812.

[0064] After performing steps two and three of the present invention, the scum mixture falling into the scum box 172 can flow into the scum cylinder 170 and flow out of the pool body 100 through the scum discharge pipe 171 connected to the bottom of the scum cylinder 170. In conjunction with step four of the present invention, solid-liquid separation can be achieved within the pool body 100.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A highly efficient shallow air flotation machine for wastewater treatment, characterized in that, include: The pool body has a sewage pipe and an inlet pipe inserted in the middle. One end of the sewage pipe is rotatably connected to a sludge pipe whose axis is parallel to the radial direction of the pool body. The inlet pipe passes through the sewage pipe, passes through the sludge pipe and is connected to a Venturi jet. The inlet pipe is connected to the inlet of the Venturi jet. The air inlet and outlet of the Venturi jet are respectively connected to an air pipe and a dissolved air water pipe. The liquid distribution unit includes a mixing pipe and a liquid distribution pipe. The mixing pipe is connected to the sewage pipe and the dissolved air water pipe through a tee pipe. The mixing pipe is located below the sewage pipe. The liquid distribution pipe is connected to the mixing pipe and enters the tank body. The liquid distribution pipe has liquid distribution holes. The mounting frame is installed on the drain pipe, and the mounting frame is equipped with a scraper parallel to the radial direction of the pool body; The drive unit is located between the mounting frame and the pool body and is used to drive the mounting frame to rotate around the central axis of the pool body. The pool is equipped with a scum cylinder and a rotating cylinder that are coaxial with the pool body. The bottom of the scum cylinder is connected to a scum discharge pipe leading to the outside of the pool body. A scum box is provided on the scum cylinder. The two side walls of the scum box are parallel to the radial direction of the pool body. In the rotation direction of the mounting frame, the height of the front side wall of the scum box is greater than the height of its rear side wall. The rotating cylinder is sleeved on the outside of the scum cylinder and is rotatably connected to the pool body. A clean water pipe is connected to the side wall of the rotating cylinder. A water collection hole is opened on the clean water pipe. The bottom of the rotating cylinder is connected to an external water collection device through a water outlet pipe. The mounting frame is equipped with a bending assembly for bending the scraper in the direction of rotation of the mounting frame. The bent scraper can pass through the lower side wall of the scum box as the mounting frame rotates, and returns to its original shape before rotating to the upper side wall of the scum box. The liquid level of the wastewater and dissolved air water mixture introduced into the tank through the liquid distribution pipe is located below the top of the two side walls of the scum box.

2. The ultra-efficient shallow air flotation machine for wastewater treatment according to claim 1, characterized in that: The bottom of the pool is provided with a drain hole, the length of which is parallel to the radial direction of the pool. A drain pipe connected to the drain hole is connected to the bottom of the pool. One end of the liquid distribution pipe that extends into the pool body is fixed with a drain rod that is radially parallel to the pool body, and the drain rod is in contact with the inner bottom surface of the pool body.

3. The ultra-efficient shallow air flotation machine for wastewater treatment according to claim 1, characterized in that: The drive unit includes a motor and a drive wheel. The motor is mounted on a mounting frame, and the drive wheel is rotatably mounted on the mounting frame. The surface of the drive wheel abuts against the top end face of the pool body. A drive wheel is mounted on the output shaft of the motor, and the drive wheel is connected to the drive wheel through a transmission belt. When the drive wheel moves along the top end face of the pool body, the drive wheel drives the mounting frame to rotate around the central axis of the pool body.

4. The ultra-efficient shallow air flotation machine for wastewater treatment according to claim 1, characterized in that: The rotating drum includes a rotating part and a fixed part. The rotating part is rotatably disposed on the inner bottom surface of the pool body. The clear water pipe is fixed on the side wall of the rotating part. The fixed part is rotatably connected to the top of the rotating part and is fixedly connected to the scum box. The fixed part is used to prevent sewage and dissolved air water mixture in the pool body from flowing into the rotating drum.

5. The ultra-efficient shallow air flotation machine for wastewater treatment according to claim 1, characterized in that: The bending assembly includes a rotating rod, a first pull rope, a lever, a deflector, and a stop bar. The rotating rod is rotatably mounted on the mounting frame, and the axial direction of the rotating rod is parallel to the length direction of the scraper. The lever is fixed on the rotating rod. One end of the first pull rope is connected to the end of the lever away from the rotating rod, and the other end is connected to the end of the scraper away from the mounting frame. The deflector is fixed on the side of the rotating rod facing the central axis of the pool. The stop bar is fixed on the rod wall through which the water inlet pipe passes through the sewage pipe. As the mounting bracket rotates axially around the rotating drum along with the sewage pipe, the actuating plate can abut against the stop bar. When the actuating plate abuts against the stop bar and the mounting bracket continues to rotate, the actuating plate drives the rotating rod to rotate, causing the first pull rope to drive the scraper to bend in the direction of the mounting bracket's rotation.

6. The ultra-efficient shallow air flotation machine for wastewater treatment according to claim 1, characterized in that: The scraper is provided in multiple pieces, which are distributed at equal angles around the central axis of the pool on the bottom surface of the mounting frame. A second pull rope is connected between adjacent scrapers, and the second pull rope is in a slack state.

7. The ultra-efficient shallow air flotation machine for wastewater treatment according to claim 1, characterized in that: The system has multiple water pipes, and the axial direction of each water pipe is parallel to the radial direction of the pool body. The water pipes are spaced apart from the bottom surface of the pool body, and the water pipes are close to the bottom surface of the pool body on the rotating drum.

8. The ultra-efficient shallow air flotation machine for wastewater treatment according to claim 1, characterized in that: The liquid distribution pipe is provided with multiple pipes, which are evenly distributed along the axial direction of the mixing pipe, and the axial direction of the liquid distribution pipe is perpendicular to the axial direction of the mixing pipe.

9. A wastewater treatment process, applied in the ultra-efficient shallow air flotation unit as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Sewage, clean water, and air are respectively introduced into the sewage pipe, the water inlet pipe, and the air inlet pipe, so that the mixed liquid in the mixing pipe flows into the pool body through the distribution hole on the distribution pipe; Step 2: Drive the mounting frame to rotate around the central axis of the pool body through the drive unit. When the mounting frame rotates, the scraper bends to one side of the rotation direction through the bending assembly to scoop up the scum mixture in the pool body. After scooping up the scum mixture, the scraper rotates between the two side walls of the scum box and returns to its original shape, so that the scum mixture scooped up by the scraper is poured into the scum box. Step 3: When the scraper rotates to the high side wall of the scum box, the scraper is bent in the opposite direction of rotation by the counter-pushing force of the high side wall, so that the scum mixture adhering to the side of the scraper facing the direction of rotation is scraped off by the wall of the scum box and into the scum box. Step 4: When the mounting frame rotates, the water pipe rotates accordingly, which is used to flow the water in the pool into the rotating drum through the water pipe, and then transport it to the external water collection device through the water outlet pipe.

10. A wastewater treatment process according to claim 9, characterized in that: In steps two and three, the scum mixture in the scum box flows into the scum cylinder and flows out of the pool through the scum discharge pipe connected to the bottom of the scum cylinder.

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