A microbubble dissolved air flotation device

Abstract

This invention belongs to the field of dissolved air flotation, specifically a microbubble dissolved air flotation device. Addressing the problems of existing devices failing to efficiently generate a large number of nanoscale microbubbles, and the resulting bubbles having short residence times in water and relatively low surface loading, leading to low adhesion efficiency of suspended solids and affecting turbidity removal efficiency and purification effect, the following solution is proposed. It includes a tank body, within which a stirring mechanism is installed in the reaction zone to agitate the water and aid flocculation. A dissolved air assembly is installed within the dissolved air tank body to generate microbubbles that adhere to suspended solids in the flocculated water within the dissolved air tank. In this invention, the dissolved air assembly efficiently generates a large number of nanoscale microbubbles. These microbubbles have longer residence times in water, higher surface loading, and can quickly adhere to the flocculated suspended solids, promoting their flotation and separation, thereby significantly improving the turbidity removal efficiency and purification effect of water treatment.

Description

Technical Field

[0001] This utility model relates to the field of dissolved air flotation technology, and in particular to a microbubble dissolved air flotation device. Background Technology

[0002] Dissolved air flotation (DAF) is a solid-liquid separation device that uses microbubbles generated by the equipment to contact suspended solids in wastewater, making the density of the suspended solids lower than that of water. This causes the suspended solids to float rapidly to the surface of the wastewater, thus removing suspended solids (including fine particles such as oils that are insoluble in water) from the water.

[0003] Currently, although existing dissolved air flotation devices can contact suspended solids in wastewater through microbubbles generated by the equipment, thereby reducing the density of the suspended solids and causing them to float to the water surface to achieve solid-liquid separation, they cannot efficiently generate a large number of nano-sized microbubbles. Moreover, the generated bubbles have a short residence time in water and a relatively low surface load, resulting in low attachment efficiency of suspended solids and affecting the turbidity removal efficiency and purification effect of water treatment. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the inability to efficiently generate a large number of nanoscale microbubbles, the short residence time of the generated bubbles in water, and the relatively low surface load, which leads to low adhesion efficiency of suspended matter and affects the turbidity removal efficiency and purification effect. Therefore, a microbubble dissolved air flotation device is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A microbubble dissolved air flotation device, comprising:

[0007] The pool body has a reaction zone and a dissolved gas tank inside. A partition is fixedly installed in the dissolved gas tank. A water supply connector is fixedly connected to one side of the pool body located in the reaction zone. The reaction zone is divided into two parts by a baffle. A sludge scraping device is fixedly installed on the top of the pool body.

[0008] The pool body is equipped with a stirring mechanism inside the reaction zone. The stirring mechanism is used to stir the water inside the reaction zone to aid flocculation. The pool body is equipped with a dissolved air assembly inside the dissolved air tank. The dissolved air assembly is used to generate microbubbles to attach suspended solids in the flocculated water inside the dissolved air tank.

[0009] In one possible design, the stirring mechanism includes two fixed seats symmetrically fixedly arranged on the tank body at the top of the reaction zone. The installation positions of the two fixed seats correspond to two locations separated by a baffle. A motor is fixedly installed on the top of each of the two fixed seats. A rotating rod extending into the interior of the reaction zone is fixedly installed at one end of the output shaft of each of the two motors. A stirring blade is fixedly installed on the outside of each of the two rotating rods.

[0010] In one possible design, the dissolved gas assembly includes a fixed pipe fixedly installed at the top of the dissolved gas tank. The bottom of the fixed pipe is uniformly and fixedly connected to two connecting seats. The bottom of each of the two connecting seats is fixedly connected to a connecting pipe extending into the interior of the dissolved gas tank. The bottom ends of the two connecting pipes are fixedly connected to the same dissolved gas pipe. One end of the dissolved gas pipe is fixedly connected to one of the locations in the reaction zone. The bottom ends of the two connecting pipes, located inside the dissolved gas pipe, are fixedly connected to a release device. A dissolved gas tank is fixedly installed on one side of the tank, and the bottom side of the dissolved gas tank is fixedly connected to the fixed pipe.

[0011] In one possible design, the dissolved air assembly includes an air compressor, the output end of which is fixedly connected to an air pipe, the top of the dissolved air tank is fixedly connected to a solenoid valve, one end of which is fixedly connected to one end of the air pipe, and a float level gauge is installed on the top of the dissolved air tank.

[0012] In one possible design, a slag storage bin is located away from the reaction zone within the tank. A slag discharge pipe, connected to the slag storage bin, is fixedly installed below the slag storage bin on one side of the tank. A clear water bin is located inside the tank next to the slag storage bin. A clear water pipe is fixedly installed inside the tank below the slag scraping device, with its other end extending into and connecting to the clear water bin. A reflux pump is fixedly installed below the bottom of the clear water bin. A suction pipe is fixedly connected to the input end of the reflux pump and is connected to the clear water bin. A delivery pipe is fixedly connected to the output end of the reflux pump, with one end of the delivery pipe fixedly connected to the dissolved gas tank. An outlet bin is located inside the tank next to the clear water bin and is fixedly connected to a drain connector.

[0013] In one possible design, a protective walkway is fixedly installed on one side of the pool.

[0014] In this application, when starting to use the device, first connect the entire device and the air compressor to the power supply, and then connect the water supply connector, slag discharge pipe and drainage connector to the corresponding pipes. At this time, the float level gauge on the dissolved gas tank is turned on to monitor the liquid level in the dissolved gas tank.

[0015] Then, the water to be treated is fed into the reaction zone of the tank through the water inlet connector (at this time, the water to be treated first enters a part of the reaction zone separated by a baffle, and flocculants or coagulants can be added to this part of the reaction zone at the same time). Then, the two motors on the fixed base are started. The output shafts of the two motors drive the rotating rod and the stirring blade to rotate. At this time, the stirring blades fully stir the water in the area where flocculants or coagulants are added, promoting the flocculants or coagulants to mix fully with the suspended solids in the water to form flocs. As the water volume increases, the stirred water overflows the baffle and flows into another part of the reaction zone. At this time, the motor in the other part drives the stirring blades to continue stirring the water, further promoting the flocculants or coagulants to mix fully with the suspended solids in the water to form flocs.

[0016] Simultaneously, the air compressor starts, delivering compressed air through the air pipe to the dissolved air tank (at this time, the solenoid valve opens). Water in the dissolved air tank forms dissolved air water under the action of the compressed air. When the float level gauge detects that the dissolved air water in the tank has reached the predetermined amount, the solenoid valve and air compressor close. At this point, the dissolved air tank delivers the air-saturated dissolved air water to the fixed pipe. The dissolved air water inside the fixed pipe is then delivered to the release device through the connecting seat and connecting pipe (at this time, the flocculated water located inside the reaction zone is delivered to the dissolved air pipe). The release device then instantaneously releases the pressure of the air-saturated dissolved air water, generating a large number of nano-sized microbubbles (microbubble particle size 10-30µm, longer residence time in water, and surface load as high as 10-30m³ / h). (m2:h) occupies less space. Nanoscale microbubbles are released from the emitter into the dissolved air pipe and come into contact with the flocculants flowing from the reaction zone. The microbubbles quickly attach to the flocculated suspended matter, causing the density of the suspended matter to gradually decrease to less than the density of water, automatically floating to the surface to form a scum layer. The water, after being dissolved and stratified, is discharged into the dissolved air tank through the dissolved air pipe. As the water volume inside the dissolved air tank increases, it overflows through the baffle and enters the tank below the scum scraper. The water, after being dissolved and stratified, enters the tank, with the clear water descending and the scum layer rising. During this process, the scum scraper is activated. The scum scraper is driven by a motor to rotate a rotating rod, which in turn drives a sprocket to rotate. The rotation of the wheel drives the meshing chain to move, and the chain movement drives the scraper installed on it to move. The scraper removes suspended solids from the water surface and collects them in the slag bin. The slag can be discharged from the pool through the slag discharge pipe. The clear water at the bottom after separation enters the clear water bin through the clear water pipe. At this time, the return pump starts. The input end of the return pump draws out part of the clear water in the clear water bin through the suction pipe and then transports it to the dissolved air tank through the delivery pipe as the water source for dissolved air water. The remaining clear water after being drawn out overflows from the clear water bin into the outlet bin. The clear water in the outlet bin can be discharged from the pool through the drain connector as the water source for the treated water.

[0017] This utility model has the following beneficial effects:

[0018] The present invention utilizes a stirring mechanism to effectively promote the thorough mixing of flocculants and coagulants with suspended solids in water, forming flocs, thereby improving the efficiency and effectiveness of water treatment.

[0019] In this invention, the dissolved air component enables the efficient generation of a large number of nano-sized microbubbles. These microbubbles have a longer residence time in water, a higher surface load, and can quickly attach to well-flocculated suspended matter, promoting its floating and separation, thereby significantly improving the turbidity removal efficiency and purification effect of water treatment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall main structure of a microbubble dissolved air flotation device proposed in this utility model;

[0021] Figure 2 This is a side view of the overall structure of a microbubble dissolved air flotation device proposed in this utility model;

[0022] Figure 3 This is a schematic cross-sectional view of the tank structure of a microbubble dissolved air flotation device proposed in this utility model;

[0023] Figure 4 This is a bottom view of the tank structure of a microbubble dissolved air flotation device proposed in this utility model;

[0024] Figure 5 This is an enlarged structural diagram of part A of the microbubble dissolved air flotation device proposed in this utility model.

[0025] In the diagram: 1. Protective walkway; 2. Pool body; 201. Reaction zone; 202. Dissolved gas tank; 203. Slag storage bin; 204. Clear water bin; 2041. Clear water pipe; 205. Outlet water bin; 3. Water supply connector; 4. Fixing base; 5. Motor; 6. Rotating rod; 7. Stirring blade; 8. Fixing pipe; 9. Connecting base; 10. Connecting pipe; 1001. Dissolved gas pipe; 11. Release device; 12. Baffle plate; 13. Dissolved gas tank; 14. Solenoid valve; 15. Air compressor; 16. Air pipe; 17. Float level gauge; 18. Return pump; 19. Suction pipe; 20. Conveying pipe; 21. Slag scraper. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0027] Reference Figure 1-5 An air flotation device, comprising:

[0028] The tank body 2 includes a stirring mechanism, dissolved air assembly, slag scraping device 21, slag storage bin 203, clear water bin 204, reflux pump 18, and effluent bin 205. Inside the tank body 2, there is a reaction zone 201 and a dissolved air tank 202, which are separated to ensure that their respective functional areas are independent and do not interfere with each other. The reaction zone 201 is further divided into two parts by a baffle to achieve multi-stage flocculation reaction. The baffle 12 can separate the dissolved air tank 202 and the slag scraping area. A protective walkway 1 is provided on the top of the tank body 2 for easy operation and maintenance.

[0029] At the top of the reaction zone 201, there are two fixed seats 4 symmetrically fixedly installed in the tank body 2. The installation positions of the two fixed seats 4 correspond to the two reaction zones 201 separated by baffles. A motor 5 is fixedly installed on the top of each fixed seat 4. The output shaft of the motor 5 is connected to the rotating rod 6 extending into the reaction zone 201 through a coupling. A stirring blade 7 is fixedly installed on the outside of the rotating rod 6. The shape and number of stirring blades 7 are designed according to actual needs to ensure good stirring effect. When the motor 5 is started, the output shaft drives the rotating rod 6 and stirring blades 7 to rotate, stirring the water inside the reaction zone 201, promoting the flocculant or coagulant aid to fully mix with the suspended solids in the water to form flocs.

[0030] At the top of the dissolved air tank 202, a fixed pipe 8 is fixedly installed in the tank body 2. Two connecting seats 9 are evenly and fixedly connected to the bottom of the fixed pipe 8. Each connecting seat 9 has a connecting pipe 10 extending into the dissolved air tank 202. The bottom ends of the two connecting pipes 10 are fixedly connected to the same dissolved air pipe 1001. One end of the dissolved air pipe 1001 is fixedly connected to one location in the reaction zone 201. Both the bottom ends of the two connecting pipes 10 are fixedly connected to a release device 11 inside the dissolved air pipe 1001. The release device 11 can instantly release the pressure of the air-saturated dissolved water, generating a large number of nano-sized microbubbles. A dissolved air tank 13 is fixedly installed on one side of the tank body 2. The bottom of the dissolved air tank 13 is fixedly connected to the fixed pipe 8. A solenoid valve 14 is fixedly connected to the top of the dissolved air tank 13. One end of the solenoid valve 14 is fixedly connected to the output end of the air compressor 15 through an air pipe 16. A float level indicator is installed on the dissolved air tank 13. The level gauge 17 is used to monitor the liquid level changes in the dissolved air tank 13. When the air compressor 15 starts, it delivers compressed air to the dissolved air tank 13 through the air pipe 16. The solenoid valve 14 opens, allowing the compressed air to enter the dissolved air tank 13. The water in the dissolved air tank 13 forms dissolved air water under the action of the compressed air. When the float level gauge 17 detects that the dissolved air water in the dissolved air tank 13 has reached the predetermined amount, the solenoid valve 14 and the air compressor 15 close, stopping the air supply and the preparation of dissolved air water. The dissolved air tank 13 delivers the dissolved air water saturated with air to the fixed pipe 8, and then delivers it to the release device 11 through the connecting seat 9 and the connecting pipe 10. The release device 11 instantly releases the pressure of the dissolved air water saturated with air, generating a large number of nano-sized microbubbles. These microbubbles enter the dissolved air pipe 1001 and come into contact with the flocs flowing from the reaction zone 201. They quickly attach to the flocculated suspended matter, making its density gradually less than that of water, and automatically float to the surface to form a scum layer.

[0031] The sludge scraping device 21 is fixedly installed at the top of the pool body 2, above the dissolved air tank 202. The sludge scraping device 21 includes components such as a motor, rotating rod, sprocket, chain, and scraper. When sludge scraping is required, the motor of the sludge scraping device 21 is started. The motor drives the rotating rod to rotate, which drives the sprocket to rotate. The rotation of the sprocket drives the meshing chain to move. At the same time, the chain moves the scraper installed on it. The scraper scrapes off the suspended matter on the water surface and scrapes it to the sludge storage bin 203 for collection. The sludge in the sludge storage bin 203 can be discharged from the pool body 2 through the sludge discharge pipe.

[0032] A slag storage bin 203 is located away from the reaction zone 201 inside the tank 2. A slag discharge pipe, connected to the slag storage bin 203, is fixedly installed below the slag storage bin 203 on one side of the tank 2. A clear water bin 204 is located inside the tank 2 next to the slag storage bin 203. A clear water pipe 2041 is fixedly installed inside the tank 2 below the slag scraping device 21. The other end of the clear water pipe 2041 extends into and connects to the clear water bin 204. A reflux pump 18 is fixedly installed below the bottom of the clear water bin 204 in the tank 2. A suction pipe 19 is fixedly connected to the input end of the reflux pump 18 and is connected to the clear water bin 204. A delivery pipe 20 is fixedly connected to the output end of the reflux pump 18. One end of 20 is fixedly connected to the dissolved air tank 13. Inside the pool body 2, next to the clear water tank 204, there is an outlet tank 205. The outlet tank 205 is fixedly connected to a drain connector. After the water that has passed through the dissolved air stratification enters the pool body 2, the clear water descends to the bottom, the scum layer rises to the surface, and the clear water enters the clear water tank 204 through the clear water pipe 2041. The return pump 18 is started to extract part of the clear water in the clear water tank 204 and transport it to the dissolved air tank 13 through the conveying pipe 20 as the water source for dissolved air water, so as to realize the recycling of clear water. The remaining clear water after being sucked out overflows from the clear water tank 204 to the outlet tank 205. The clear water in the outlet tank 205 can be discharged from the pool body 2 through the drain connector as the treated water source.

[0033] This application can be used in the field of microbubble dissolved air flotation device technology, and can also be used in other fields applicable to this application. Example

[0034] Based on Embodiment 1, Embodiment 2 further includes: a microbubble dissolved air flotation device, which is applied to the field of microbubble dissolved air flotation device technology. A protective walkway 1 is fixedly installed on one side of the pool body 2 to provide safe and convenient passage and operation space for operators.

[0035] However, as is well known to those skilled in the art, the working principles and wiring methods of the motor 5, release device 11 (which can be model TJ-3 / 5 / 10 or other compatible electrical components), solenoid valve 14 (which can be model ZCF51 or other compatible electrical components), air compressor 15 (which can be model DLX-ACC6022 or other compatible electrical components), float level gauge 17 (which can be model LFC-01 or other compatible electrical components), and reflux pump 18 are commonplace and belong to conventional methods or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0036] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A micro-bubble dissolved air flotation apparatus, characterized by, include: The pool body (2) has a reaction zone (201) and a dissolved air tank (202) inside. A partition (12) is fixedly installed at the dissolved air tank (202). A water supply connector (3) is fixedly connected to one side of the pool body (2) located in the reaction zone (201). The reaction zone (201) is divided into two parts by a baffle. A sludge scraping device (21) is fixedly installed on the top of the pool body (2). The pool body (2) is equipped with a stirring mechanism inside the reaction zone (201). The stirring mechanism is used to stir the water inside the reaction zone (201) to aid flocculation. The pool body (2) is equipped with a dissolved air component inside the dissolved air tank (202). The dissolved air component is used to generate microbubbles to attach suspended matter in the flocculated water inside the dissolved air tank (202).

2. The microbubble dissolved air flotation device according to claim 1, characterized in that, The stirring mechanism includes two fixed seats (4) symmetrically fixedly arranged on the top of the reaction zone (201) of the tank body (2). The installation positions of the two fixed seats (4) correspond to the two locations separated by the baffle. A motor (5) is fixedly arranged on the top of each of the two fixed seats (4). A rotating rod (6) extending into the interior of the reaction zone (201) is fixedly arranged at one end of the output shaft of each of the two motors (5). A stirring blade (7) is fixedly arranged on the outside of each of the two rotating rods (6).

3. The microbubble dissolved air flotation device according to claim 1, characterized in that, The dissolved gas assembly includes a fixed pipe (8) fixedly installed on the top of the dissolved gas tank (202) of the pool body (2). The bottom of the fixed pipe (8) is uniformly connected to two connecting seats (9). The bottom of the two connecting seats (9) is fixedly connected to a connecting pipe (10) extending into the interior of the dissolved gas tank (202). The bottom ends of the two connecting pipes (10) are fixedly connected to the same dissolved gas pipe (1001). One end of the dissolved gas pipe (1001) is fixedly connected to one of the reaction zones (201). The bottom ends of the two connecting pipes (10) are fixedly connected to a release device (11) inside the dissolved gas pipe (1001). A dissolved gas tank (13) is fixedly installed on one side of the pool body (2). The bottom side of the dissolved gas tank (13) is fixedly connected to the fixed pipe (8).

4. The microbubble dissolved air flotation device according to claim 3, characterized in that, The dissolved gas assembly includes an air compressor (15), the output end of which is fixedly connected to an air pipe (16), the top of the dissolved gas tank (13) is fixedly connected to a solenoid valve (14), one end of the solenoid valve (14) is fixedly connected to one end of the air pipe (16), and a float level gauge (17) is provided on the top of the dissolved gas tank (13).

5. The microbubble dissolved air flotation device according to claim 4, characterized in that, A slag storage bin (203) is located away from the reaction zone (201) inside the pool (2). A slag discharge pipe connected to the slag storage bin (203) is fixedly installed below the slag storage bin (203) on one side of the pool (2). A clear water bin (204) is located next to the slag storage bin (203) inside the pool (2). A clear water pipe (2041) is fixedly installed below the slag scraping device (21) inside the pool (2). The other end of the clear water pipe (2041) extends into and connects with the clear water bin (204). 2) A reflux pump (18) is fixedly installed below the bottom of the clear water tank (204). The input end of the reflux pump (18) is fixedly connected to a suction pipe (19). The suction pipe (19) is connected to the clear water tank (204). The output end of the reflux pump (18) is fixedly connected to a delivery pipe (20). One end of the delivery pipe (20) is fixedly connected to the dissolved air tank (13). Inside the pool body (2), next to the clear water tank (204), there is a water outlet tank (205). The water outlet tank (205) is fixedly connected to a drain connector.

6. The microbubble dissolved air flotation device according to claim 1, characterized in that, A protective walkway (1) is fixedly installed on one side of the pool body (2).

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