Coagulation air floatation tank for industrial sewage treatment

Abstract

The utility model provides a coagulation air floatation tank for industrial sewage treatment, and relates to the technical field of industrial sewage treatment devices, the coagulation air floatation tank comprises a tank body, a coagulation cylinder, a sewage inlet pipe, an inner ring pipe, a chute, a slag scraping device and a drainage pipe, the coagulation cylinder is arranged in the tank body and is coaxial with the tank bottom, a scum area is arranged between the top opening of the coagulation cylinder and the top opening of the tank body, and the inner ring pipe is arranged in the tank body. An air flotation area is arranged between the tank body and the coagulation cylinder, the outlet end of the sewage inlet pipe penetrates through the tank wall and extends into the lower portion of the coagulation cylinder, the sewage inlet end of the sewage inlet pipe is connected with the pipeline mixer, the inner ring pipe is arranged in the middle of the air flotation area and connected with the dissolved air supply pipe, air distribution holes are evenly formed in the inner ring pipe, and the chute is installed on the tank wall of the scum area and communicated with the scum discharge pipe. The slag scraping device is mounted above the chute, and the drainage pipe is arranged on the tank wall below the inner ring pipe, so that the problems of non-uniform mixing of sewage and a flocculating agent, poor diffusivity in the tank and insufficient contact with dissolved air in an existing coagulation air floatation tank can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial sewage treatment devices, and particularly relates to a coagulation air flotation tank for industrial sewage treatment. Background Technique

[0002] Industrial sewage uses a coagulation air flotation tank to remove oils and suspended solids in the sewage. Flocculant PAC is first added to the coagulation air flotation tank, so that colloidal suspended particles or emulsified pollutants that are difficult to precipitate in water lose stability and agglomerate into micelles. Then, it enters the air flotation section, where fine bubbles adhere to the suspended particles in the water to form a "bubble - particle" complex with an overall density less than that of water, causing the suspended particles to float to the water surface together with the bubbles.

[0003] The disadvantages of the coagulation air flotation tank are that the equipment in the coagulation section and the air flotation section are relatively independent, occupying a large area and being difficult to operate. Therefore, coagulation air flotation tanks with higher integration have begun to appear on the market. However, the existing coagulation air flotation tanks have problems such as uneven mixing of sewage and flocculant, poor diffusivity in the tank, and insufficient contact with dissolved air. Therefore, this application proposes a coagulation air flotation tank for industrial sewage treatment. Content of the Utility Model

[0004] In order to overcome the problems in the background technique, the utility model provides a coagulation air flotation tank for industrial sewage treatment, which solves the problems of uneven mixing of sewage and flocculant, poor diffusivity in the tank, and insufficient contact with dissolved air existing in the existing coagulation air flotation tanks.

[0005] A coagulation air flotation tank for industrial sewage treatment includes a tank body, a coagulation cylinder, a sewage inlet pipe, an inner ring pipe, an inclined trough, a slag scraping device, and a drain pipe. The coagulation cylinder is coaxially arranged with the bottom of the tank body inside the tank. The top of the coagulation cylinder is open, and the area between the top opening of the coagulation cylinder and the top opening of the tank body is the scum area. The area between the tank body and the coagulation cylinder is the air flotation area. The outlet end of the sewage inlet pipe passes through the tank wall and extends into the lower part of the coagulation cylinder. The sewage inlet end of the sewage inlet pipe is connected to a pipeline mixer. The inner ring pipe is arranged in the middle of the air flotation area and is connected to a dissolved air supply pipe. The inner ring pipe is evenly provided with air distribution holes. The inclined trough is installed on the tank wall of the scum area and is communicated with a slag discharge pipe. The slag scraping device is installed above the inclined trough. The drain pipe is arranged on the tank wall below the inner ring pipe.

[0006] Further, the top of the coagulation cylinder is in the shape of an expanding flared opening.

[0007] Further, a support rod is coaxially installed inside the coagulation cylinder, and a spiral blade is rotatably installed on the support rod.

[0008] Further, the outlet end of the sewage inlet pipe is provided with a rotary spray head, which is arranged upward inside the coagulation cylinder, and the nozzle of the rotary spray head is tangentially arranged with the cylinder wall.

[0009] Further, the slag scraping device includes a motor and a slag scraping plate. The motor is installed on the open mouth of the tank body through a support plate. The slag scraping plate is connected to the power output end of the motor through a rotating shaft, and the bottom of the slag scraping plate is arranged adjacent to the notch of the inclined chute.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] This application is provided with a coagulation cylinder, a sewage inlet pipe and an inner ring pipe. Pollutants and flocculants can be fully mixed in the coagulation cylinder and then diffuse out, and contact with the dissolved air evenly supplied by the inner ring pipe, so that the suspended matter can fully contact with the dissolved air and float, improving the quality of the effluent, and solving the problems of uneven mixing of sewage and flocculants, poor diffusibility in the tank and insufficient contact with dissolved air existing in the existing coagulation air flotation tank. Description of the Drawings

[0012] In order to clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for the description of the embodiments are described.

[0013] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 It is a schematic top view structure of the present utility model;

[0015] Figure 3 It is a schematic front view structure of the present utility model.

[0016] 1 - Tank body, 2 - Coagulation cylinder, 21 - Support rod, 22 - Spiral blade, 3 - Sewage inlet pipe, 31 - Rotary nozzle, 4 - Inner ring pipe, 5 - Inclined chute, 6 - Slag scraping device, 61 - Motor, 62 - Slag scraping plate, 7 - Drain pipe, 8 - Pipe mixer. Detailed Embodiments

[0017] In order to make the purpose, technical solutions and beneficial effects of the present utility model clearer, the preferred embodiments of the present utility model will be described in detail below with reference to the drawings for the convenience of those skilled in the art to understand.

[0018] The present utility model provides a coagulation air flotation tank for industrial sewage treatment. Refer to Figures 1 - 3, A coagulation air flotation tank for industrial sewage treatment, comprising a tank body 1, a coagulation cylinder 2, a sewage inlet pipe 3, an inner ring pipe 4, an inclined chute 5, a scum scraping device 6 and a drain pipe 7. The coagulation cylinder 2 is coaxially arranged with the tank bottom inside the tank body 1. The space between the top opening of the coagulation cylinder 2 and the top opening of the tank body 1 is the scum area, and the space between the tank body 1 and the coagulation cylinder 2 is the air flotation area. The outlet end of the sewage inlet pipe 3 passes through the tank wall and extends into the lower part of the coagulation cylinder 2. The sewage inlet end of the sewage inlet pipe 3 is connected to a pipeline mixer 8. The inner ring pipe 4 is arranged in the middle of the air flotation area and connected to a dissolved air supply pipe. The inner ring pipe 4 is evenly provided with air distribution holes. The inclined chute 5 is installed on the tank wall of the scum area and communicated with a slag discharge pipe. The scum scraping device 6 is installed above the inclined chute 5. The drain pipe 7 is arranged on the tank wall below the inner ring pipe 4.

[0019] In the coagulation cylinder 2 of the tank body 1, sewage and flocculant premixed by the pipeline mixer 8 can be pumped in through the sewage inlet pipe 3. The sewage and flocculant entering the coagulation cylinder 2 diffuse while mixing and can escape through the top opening of the coagulation cylinder 2. The inner ring pipe 4 can be connected to the dissolved air supply pipe, and the dissolved air water is evenly distributed into the air flotation area through the air distribution holes, adheres to the flocculated suspended particles, and floats to the water surface together with the bubbles. The scum scraping device 6 can scrape the floating scum into the inclined chute 5 for collection and discharge, and the treated clear water is discharged through the drain pipe 7 at the lower part of the tank body 1.

[0020] Refer to Figures 1 - 3 , The top of the coagulation cylinder 2 is in the shape of an expanding flared mouth, which is convenient for the evenly diffusion of the flocculated suspended particles to contact with the dissolved air water.

[0021] Refer to Figures 1 - 3 , A support rod 21 is coaxially installed in the coagulation cylinder 2, and a spiral blade 22 is rotatably installed on the support rod 21. The sewage discharged from the sewage inlet pipe 3 can drive the spiral blade 22 to rotate during the flowing process, so that the flocculant contacts with the impurity components.

[0022] Refer to Figures 1 - 3 , The outlet end of the sewage inlet pipe 3 is provided with a rotary nozzle 31. The rotary nozzle 31 is arranged upward in the coagulation cylinder 2, and the nozzle of the rotary nozzle 31 is tangentially arranged with the cylinder wall, which can generate a vortex to enhance the coagulation effect.

[0023] Refer to Figures 1 - 3 , The scum scraping device 6 includes a motor 61 and a scum scraping plate 62. The motor 61 is installed on the open mouth of the tank body 1 through a support plate. The scum scraping plate 62 is connected to the power output end of the motor 61 through a rotating shaft. The bottom of the scum scraping plate 62 is adjacent to the notch of the inclined chute 5. The scum scraping plate 62 can scrape the floating scum into the inclined chute 5 under the drive of the scum scraping device 6.

[0024] Working process:

[0025] The sewage is pumped into the pipeline mixer 8 by a pipeline pump. The pipeline mixer 8 is connected to a flocculant dosing device. The sewage and the flocculant premixed by the pipeline mixer 8 enter the coagulation cylinder 2 through the sewage inlet pipe 3, diffuse while mixing and escape from the open top of the coagulation cylinder 2. The inner ring pipe 4 is connected to the dissolved air supply pipe, and distributes the dissolved air water evenly to the air flotation area through the air distribution holes, adheres to the flocculated suspended particles, and floats to the water surface together with the bubbles. The slag scraping device 6 scrapes the floating slag into the chute 5 for collection and discharge under the drive of the motor 61. The treated clear water is discharged through the drain pipe 7 at the lower part of the tank body 1.

[0026] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A coagulation flotation tank for industrial wastewater treatment, characterized in that: The invention comprises a tank body (1), a coagulation cylinder (2), a sewage inlet pipe (3), an inner ring pipe (4), a chute (5), a slag scraping device (6) and a drainage pipe (7). The coagulation cylinder (2) is coaxially arranged with the tank bottom in the tank body (1). The area between the top opening of the coagulation cylinder (2) and the top opening of the tank body (1) is a slag area. The area between the tank body (1) and the coagulation cylinder (2) is an air flotation area. The outlet end of the sewage inlet pipe (3) passes through the tank wall and extends into the lower part of the coagulation cylinder (2). The sewage inlet end of the sewage inlet pipe (3) is connected to a pipeline mixer (8). The inner ring pipe (4) is arranged in the middle of the air flotation area and is connected to a dissolved air supply pipe. The inner ring pipe (4) is evenly provided with air distribution holes. The chute (5) is installed on the tank wall in the slag area and is connected to the slag discharge pipe. The slag scraping device (6) is installed above the chute (5). The drainage pipe (7) is arranged on the tank wall below the inner ring pipe (4).

2. The coagulation flotation tank for industrial wastewater treatment according to claim 1, characterized in that: The top of the coagulation cylinder (2) is in the shape of an expanded trumpet.

3. The coagulation flotation tank for industrial wastewater treatment according to claim 1, characterized in that: A support rod (21) is coaxially mounted inside the coagulation cylinder (2), and a spiral blade (22) is rotatably mounted on the support rod (21).

4. The coagulation flotation tank for industrial wastewater treatment according to claim 1, characterized in that: The outlet end of the sewage inlet pipe (3) is provided with a rotating nozzle (31), the rotating nozzle (31) is arranged upward in the coagulation cylinder (2), and the nozzle of the rotating nozzle (31) is arranged tangentially to the cylinder wall.

5. The coagulation flotation tank for industrial wastewater treatment according to claim 1, characterized in that: The scraping device (6) comprises a motor (61) and a scraping plate (62). The motor (61) is mounted on the open opening of the tank body (1) via a support plate. The scraping plate (62) is connected to the power output end of the motor (61) via a rotating shaft. The bottom of the scraping plate (62) is arranged adjacent to the notch of the chute (5).

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