Novel air floatation equipment

Abstract

The utility model relates to novel air flotation equipment, and aims to efficiently treat sediments with relatively large specific gravity in sewage, simplify a sludge cleaning process and improve operation convenience. The equipment mainly comprises an air floatation tank, a dissolved air pump, a medicine supply system and a sludge hopper. The internal structure of the air floatation tank is optimized, a contact area, an air floatation separation area, a sludge concentration tank and a clear water area are arranged, a first water inlet is formed in the left side, and a slag scraper is arranged on the right side. The gas dissolving pump is arranged on the side wall, the chemical supply system is composed of a plurality of pipelines, and the sludge hopper is arranged below the tank. According to the equipment, through an integrated medicine supply system and an automatic slag scraping mechanism, manual operation is reduced, and the operation efficiency and convenience are improved. The design of the dissolved air pump ensures that dissolved air and water are uniformly mixed, and the air flotation effect is improved. The sludge thickening tank and the sludge hopper are arranged, so that effective collection and cleaning of the sludge are realized, and the stability and efficiency of the equipment are improved.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, specifically a novel air flotation device. Background Technology

[0002] An air flotation (AF) unit is a physical treatment device used to separate suspended solids and liquids. It utilizes air bubbles to adhere to solid particles, causing these particles to float to the liquid surface, where they are then removed by a scraper or scum system. Existing AF units typically consist of a tank, dissolved air tank, air compressor, and return water pump, and are controlled by an electrical control box. These devices are highly effective in treating fine suspended solids and grease in wastewater, but their capacity is limited in treating relatively heavy sediments, and they require regular cleaning of bottom sludge, making operation inconvenient. Utility Model Content

[0003] The purpose of this application is to provide a novel air flotation device that can treat relatively heavy sediments in wastewater, simplify the sludge cleaning process, and improve operational convenience. To achieve the above objective, this application provides the following technical solution: A novel air flotation device, comprising:

[0004] The dissolved air flotation (DAF) tank comprises, from left to right, a contact zone, a flotation separation zone, a sludge thickening tank, and a clear water zone. A first inlet is located on the left side of the DAF tank and is connected to a wastewater source. The sludge thickening tank is located between the flotation separation zone and the clear water zone. A sludge scraper is located above the flotation separation zone, and the scraper blades of the sludge scraper extend into the flotation separation zone to scrape the sludge into the sludge thickening tank.

[0005] A dissolved air pump is installed on the side wall of the flotation tank, and the air inlet of the dissolved air pump is connected to an air compressor. Its water inlet is connected to the clear water area via a water pump, and the dissolved air water it outputs is discharged to the contact area through a pipeline.

[0006] The drug supply system consists of multiple independent drug supply pipelines, each of which connects a drug tank and a metering pump in series to the contact area via a pipe.

[0007] A sludge hopper is provided below the flotation tank and communicates with the flotation tank. The sludge hopper is provided with a sludge inlet, which is connected to a sludge pump.

[0008] In a preferred embodiment of this technical solution, a second water inlet is further included, and an ejector is connected to the outside of the second water inlet, the ejector being connected to a sewage source.

[0009] In a preferred embodiment of this technical solution, a water inlet pipe is also included. The water inlet pipe is π-shaped, and the branch pipes of the water inlet pipe are respectively connected to the first water inlet and the second water inlet. The main pipe of the water inlet pipe is arranged longitudinally in the contact area, and the main pipe of the water inlet pipe is designed with openings at both ends.

[0010] In a preferred embodiment, this technical solution further includes a dissolved gas release device, which is disposed at the end of the dissolved gas water release pipe and located within the contact area.

[0011] In a preferred embodiment, this technical solution also includes a stirrer, which is fixedly disposed on the top of each medicine container and extends into the medicine container.

[0012] In a preferred embodiment, this technical solution further includes a mixer, which is disposed above the contact area, and the stirring device of the mixer extends into the contact area.

[0013] In a preferred embodiment of this technical solution, a guide plate is also included, which is disposed between the air flotation separation zone and the sludge thickening tank, and the guide plate is composed of two downwardly inclined plates connected together.

[0014] In a preferred embodiment, this technical solution also includes an overflow zone, which is located above the clear water zone and has an outlet to guide the effluent into a subsequent treatment device.

[0015] In a preferred embodiment, this technical solution also includes a diversion channel, which is disposed on the side plate connecting the overflow area and the clear water area.

[0016] In a preferred embodiment, this technical solution further includes a fixed plate, an adjustable baffle, a screw, and a turntable. The fixed plate is disposed at the top of the overflow area and has a through hole. The adjustable baffle is disposed in the drainage channel and has a screw connected to it. The screw passes through the through hole and is threadedly connected to the turntable. Rotating the turntable can drive the adjustable baffle to rise and fall.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] This novel dissolved air flotation (DAF) equipment features multiple chemical supply pipelines specifically designed to treat relatively heavy sediments in wastewater. By optimizing the internal structure and process flow of the DAF tank, the removal efficiency of these sediments is effectively improved. An integrated chemical supply system and an automated sludge scraping mechanism reduce the need for manual operation, enhancing the overall operating efficiency and ease of use. The dissolved air pump design ensures that dissolved air water is evenly discharged to the contact zone, thoroughly mixing with the wastewater and improving the flotation effect, thereby more effectively removing suspended solids and grease from the wastewater. Through precise control of chemical dosage and optimized flotation process, this new DAF equipment achieves higher water quality treatment standards and meets stricter environmental requirements. A sludge thickening tank facilitates sludge collection and discharge. The sludge hopper ensures timely cleaning of sludge accumulated at the bottom of the DAF tank, improving the flotation effect and ensuring its efficiency and stability. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a novel air flotation device proposed in the embodiments of this application;

[0020] Figure 2 This is a front view of a novel air flotation device proposed in the embodiments of this application;

[0021] Figure 3 This is another perspective view of a novel air flotation device proposed in the embodiments of this application;

[0022] Figure 4 This is a partial three-dimensional schematic diagram of a novel air flotation device proposed in the embodiments of this application;

[0023] Figure 5 for Figure 4 Top view;

[0024] Figure 6 for Figure 4 Another perspective of the 3D diagram;

[0025] In the diagram: 1. Dissolved air flotation tank; 2. Contact zone; 3. Dissolved air flotation separation zone; 4. Sludge thickening tank; 5. Clear water zone; 6. First inlet; 7. Sludge scraper; 8. Scraper; 9. Dissolved air pump; 10. Water pump; 11. Chemical supply system; 12. Chemical tank; 13. Metering pump; 14. Sludge hopper; 15. Sludge inlet; 16. Sludge pump; 17. Second inlet; 18. Jet ejector; 19. Inlet pipe; 20. Dissolved air release device; 21. Mixer; 22. Guide plate; 23. Overflow zone; 24. Diversion channel; 25. Fixed plate; 26. Adjustable baffle; 27. Screw; 28. Turntable; 29. ​​Through hole; 30. Agitator. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that in the description of this application, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale; for example, the thickness or width of some layers may be exaggerated relative to other layers.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0030] In order to solve the technical problems in the background art, such as Figure 1-6 As shown, this application provides a technical solution: a novel air flotation device, characterized as follows:

[0031] The dissolved air flotation (DAF) tank 1 is rectangular or rectangular in shape, and its internal structure, from left to right, is divided into a contact zone 2, a flotation separation zone 3, a sludge thickening tank 4, and a clear water zone 5. Each adjacent zone is separated by a partition. The contact zone 2 is mainly used for mixing wastewater with chemicals and dissolved air water, allowing suspended solids in the wastewater to fully contact with the gas and form bubbles. The flotation separation zone 3, located to the right of the contact zone 2, is used to achieve the flotation separation of suspended solids. The sludge thickening tank 4 is located between the flotation separation zone 3 and the clear water zone 5, and is used to collect the sludge after flotation separation. The clear water zone 5, located on the far right of the DAF tank 1, is used to collect the treated clear water. A first inlet 6 is located on the left side of the DAF tank 1, connected to an external wastewater source, for introducing the wastewater to be treated. The sludge thickening tank 4, located between the flotation separation zone 3 and the clear water zone 5, is used to collect and thicken the separated sludge. The sludge thickening tank 4 is equipped with a sludge discharge outlet to directly discharge the collected sludge. A scum scraper 7 is installed above the flotation separation zone 3. The scraper 7 is equipped with scraper blades 8 that extend into the flotation separation zone 3 to scrape scum into the sludge thickening tank 4. The scum scraper 7 helps improve the treatment efficiency of the flotation equipment and reduces scum contamination of the clear water zone 5. A dissolved air pump 9 is installed on the side wall of the flotation tank 1. The air inlet of the dissolved air pump 9 is connected to an air compressor, and the water inlet is connected to the clear water zone 5 via a water pump 10. The dissolved air water output by the dissolved air pump 9 is discharged to the contact zone 2 through a pipeline to provide the necessary air bubbles for flotation. The chemical supply system 11 consists of multiple independent chemical supply lines. Each chemical supply line connects a chemical tank 12 and a metering pump 13 in series to the contact zone 2. Each chemical tank 12 contains different chemicals for different pollutants, such as grease and heavy metals. The chemical supply system 11 is used to add appropriate amounts of chemicals to the contact zone 2 to improve the flotation effect. The chemical tank 12 is used to store chemical reagents, and the metering pump 13 is used to precisely control the dosage of the reagents. A sludge hopper 14 is installed below the flotation tank 1, connected to the flotation tank 1, to collect sludge that has settled after prolonged use. A sludge inlet 15 is provided on the sludge hopper 14, connected to a sludge pump 16, to remove sludge from the sludge hopper 14, preventing it from affecting the subsequent flotation effect and improving the stability of the mechanism. The sludge pump 16 can be used intermittently as needed to clean the sludge hopper 14.

[0032] In operation, the wastewater to be treated flows into the contact zone 2 of the flotation tank 1 through the first inlet 6. The metering pump 13 in the chemical supply system 11 adds chemical agents to the contact zone 2 according to the set dosage. The dissolved air pump 9 delivers dissolved air water into the contact zone 2, where it mixes with the wastewater and chemical agents to form bubbles. The mixed wastewater enters the flotation separation zone 3, where the bubbles adhere to the suspended solids, causing them to float to the liquid surface and form scum. The scraper 8 of the scum scraper 7 scrapes the scum into the sludge thickening tank 4. The sludge and scum in the sludge thickening tank 4 are discharged through its independent outlet, while the clean water enters the clear water zone 5 and then flows through the overflow zone 23 and the outlet into the subsequent treatment process. After long-term use, a small amount of sludge settled in the sludge hopper 14 is periodically cleaned by the sludge pump 16.

[0033] Furthermore, a second inlet 17 is added at an appropriate location in the dissolved air flotation (DAF) tank 1. This inlet is located next to the first inlet 6, allowing it to be activated in case of problems with the dissolved air tank. An ejector 18 is connected to the outside of the second inlet 17. One end of the ejector 18 is connected to the wastewater source, and the other end is connected to the second inlet 17 via a pipe, ensuring that wastewater and air can enter the DAF tank 1 simultaneously. The ejector 18 uses high-speed water flow to generate negative pressure, thereby drawing in air, increasing the dissolved gas content in the water, and enhancing the flotation effect. The second inlet 17 serves as a backup system and is an auxiliary system; it is normally not activated. When the second inlet 17 is activated, the ejector 18 begins to work, drawing in air to provide the necessary bubbles to maintain the flotation effect.

[0034] It should be noted that a π-shaped inlet pipe 19 is designed, consisting of two branch pipes and one main pipe. The two branch pipes of the inlet pipe 19 are connected to the first inlet 6 and the second inlet 17, respectively. The first inlet 6 serves as the main inlet, while the second inlet 17 serves as a backup inlet and is normally kept closed. The main pipe of the inlet pipe 19 is longitudinally positioned within the contact area 2, and its design with open ends ensures that wastewater can flow evenly into the contact area 2. This design helps to achieve uniform distribution of wastewater within the contact area 2 of the flotation tank 1, facilitates thorough mixing of wastewater with dissolved air and chemical agents, and improves the flotation effect.

[0035] It is worth noting that a dissolved air release device 20 is installed at the end of the dissolved air water release pipe, located within the contact zone 2. The function of the dissolved air release device 20 is to uniformly and effectively release the dissolved air water output from the dissolved air pump 9 into the contact zone 2 to provide the necessary air bubbles for flotation. The dissolved air release device 20 is designed to generate fine bubbles that can better adhere to suspended solid particles in wastewater, improving flotation efficiency. The dissolved air release device 20 is prior art, and its specific structure will not be described in detail here.

[0036] It should be noted that a stirrer 30 is fixedly installed on the top of each medicine tank 12, extending deep into the interior of the medicine tank 12, for stirring and mixing the chemical agents in the medicine tank 12. The main function of the stirrer 30 is to ensure that the chemical agents in the medicine tank 12 are uniformly mixed, preventing precipitation or stratification, thereby ensuring that the metering pump 13 can accurately extract the agents. The stirrer 30 can be electric or pneumatic, and the appropriate stirring speed and force are selected according to the size of the medicine tank 12 and the properties of the agents. The stirrer 30 is fixed to the top of the medicine tank 12, and its stirring shaft extends deep into the interior of the medicine tank 12, usually located in the center of the medicine tank 12 or slightly off-center to avoid friction or wear with the side wall of the medicine tank 12. Before the metering pump 13 extracts the agents, the stirrer 30 is activated first to ensure that the agents are fully mixed.

[0037] Furthermore, a mixer 21 is installed above the contact zone 2. Its agitator is designed to penetrate deep into the contact zone 2 to ensure thorough mixing of wastewater, dissolved air, and chemicals within the contact zone 2, thereby improving the contact efficiency between air bubbles and suspended solid particles during the flotation process and thus enhancing the flotation effect. The mixer 21 is electrically powered, and the appropriate agitation speed and force are selected based on the size of the contact zone 2 and the treatment requirements. The mixer 21 is fixed to the structure above the contact zone 2, with its agitator penetrating deep into the contact zone 2, typically located at the center of the contact zone 2. The mixer 21 operates simultaneously with the dissolved air releaser 20 releasing dissolved air and the chemical supply system 11 adding chemicals, ensuring thorough mixing of these additives with the wastewater.

[0038] It should be noted that the guide plate 22 is installed between the air flotation separation zone 3 and the sludge thickening tank 4, and is composed of two downwardly inclined plates connected together. It is used to guide the scum from the air flotation separation zone 3 to the sludge thickening tank 4. The main function of the guide plate 22 is to guide and concentrate the scum, ensuring that the scum can be smoothly transferred from the air flotation separation zone 3 to the sludge thickening tank 4, while reducing the diffusion of scum within the air flotation tank 1. The inclination angle and length of the guide plate 22 should be optimized to reduce the disturbance of the scum by the water flow and prevent separated scum from re-entering the air flotation separation zone 3. The guide plate 22 is installed at the junction of the air flotation separation zone 3 and the sludge thickening tank 4, with the connection of the two plates forming an inverted V-shaped path to guide the scum to the sludge thickening tank 4. The design of the guide plate 22 should be coordinated with the movement of the scraper 8 of the scraper 7 to ensure that the scraper 8 can smoothly scrape the scum into the channel formed by the guide plate 22, and then into the sludge thickening tank 4.

[0039] Furthermore, an overflow zone 23 is provided above the clear water zone 5 to collect the clean water after flotation treatment and guide it to the subsequent treatment unit. The main function of the overflow zone 23 is to collect the effluent from the clear water zone 5 and ensure that the effluent maintains a stable and uniform flow rate before flowing into the subsequent treatment unit. The overflow zone 23 can be designed as a simple trough-shaped structure, the size and shape of which are determined according to the area of ​​the clear water zone 5 and the effluent flow rate. An outlet is provided at the bottom of the side wall of the overflow zone 23, and the outlet is connected to the subsequent treatment unit. The outlet can be equipped with a regulating valve or gate to control the effluent flow rate and ensure matching with the subsequent treatment unit. The overflow zone 23 should work in conjunction with the water level control of the clear water zone 5 to ensure that an appropriate water level is maintained under different treatment loads, preventing overflow or excessively low water levels.

[0040] It should be noted that a diversion channel 24 is installed on the side plate at the connection between the overflow zone 23 and the clear water zone 5 to smoothly guide the water in the clear water zone 5 to the overflow zone 23. The main function of the diversion channel 24 is to ensure that the water effluent from the clear water zone 5 can flow smoothly into the overflow zone 23, while reducing the disturbance of the water flow to the water quality in the clear water zone 5 and maintaining the stability of the water quality. The diversion channel 24 can be designed as a rectangular opening structure, and its size and shape are determined according to the area of ​​the clear water zone 5 and the outflow rate.

[0041] It is worth noting that the fixed plate 25 is installed on top of the overflow zone 23 as a stable support structure for installing and fixing other components. A through hole 29 is provided on the fixed plate 25 for the screw 27 to pass through, allowing connection and adjustment of the position of the adjustable baffle 26. The adjustable baffle 26 is installed on the diversion channel 24 to regulate the water flow in the channel 24, controlling the flow rate and velocity of the water from the clear water zone 5 to the overflow zone 23. The screw 27 connects the adjustable baffle 26 and the turntable 28 for adjusting the height of the baffle. The turntable 28 is installed on the fixed plate 25, and the screw 27 is threadedly connected to the turntable 28 after passing through the through hole 29. By rotating the turntable 28, the screw 27 can be driven to move up and down, thereby raising and lowering the adjustable baffle 26. The adjustable baffle 26 allows the operator to adjust the water flow in the diversion channel 24 according to treatment needs and flow rate changes to optimize the operating efficiency and effluent quality of the flotation equipment.

[0042] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel air flotation device, characterized in that, include: The air flotation tank (1) has a contact zone (2), an air flotation separation zone (3), a sludge thickening tank (4), and a clear water zone (5) inside from left to right. A first inlet (6) is provided on the left side of the air flotation tank (1), and the first inlet (6) is connected to the sewage source. The sludge thickening tank (4) is located between the air flotation separation zone (3) and the clear water zone (5). A sludge scraper (7) is provided above the air flotation separation zone (3). The scraper (8) of the sludge scraper (7) extends into the air flotation separation zone (3) and scrapes the sludge into the sludge thickening tank (4). Dissolved air pump (9), the dissolved air pump (9) is installed on the side wall of the flotation tank (1), and the air inlet of the dissolved air pump (9) is connected to the air compressor, and its water inlet is connected to the clear water area (5) via the water pump (10), and the dissolved air water output by the pump is extended through the pipeline to the contact area (2). The drug supply system (11) consists of multiple independent drug supply pipelines, each of which connects the drug tank (12) and the metering pump (13) in series to the contact area (2). A sludge hopper (14) is provided below the flotation tank (1) and is connected to the flotation tank (1). The sludge hopper (14) is provided with a sludge inlet (15) and the sludge inlet (15) is connected to a sludge pump (16).

2. The novel air flotation device according to claim 1, characterized in that, It also includes a second inlet (17), which is externally connected to a jet nozzle (18), which is connected to a sewage source.

3. The novel air flotation device according to claim 2, characterized in that, It also includes a water inlet pipe (19), which is π-shaped. The branch pipes of the water inlet pipe (19) are connected to the first water inlet (6) and the second water inlet (17) respectively. The main pipe of the water inlet pipe (19) is arranged longitudinally in the contact area (2). The main pipe of the water inlet pipe (19) is designed with openings at both ends.

4. The novel air flotation device according to claim 3, characterized in that, It also includes a dissolved gas release device (20), which is disposed at the end of the dissolved gas water release pipe and located within the contact area (2).

5. The novel air flotation device according to claim 1, characterized in that, It also includes a stirrer (30), which is fixedly disposed on the top of each of the medicine containers (12) and extends into the medicine container (12).

6. The novel air flotation device according to claim 1, characterized in that, It also includes a mixer (21) disposed above the contact area (2), wherein the stirring device of the mixer (21) extends into the contact area (2).

7. The novel air flotation device according to claim 1, characterized in that, It also includes a guide plate (22), which is disposed between the air flotation separation zone (3) and the sludge thickening tank (4). The guide plate (22) is composed of two downwardly inclined plates connected together.

8. The novel air flotation device according to any one of claims 1-7, characterized in that, It also includes an overflow area (23), which is located above the clear water area (5). The overflow area (23) is provided with an outlet to introduce the water into the subsequent treatment device.

9. The novel air flotation device according to claim 8, characterized in that, It also includes a diversion channel (24), which is disposed on the side plate connecting the overflow area (23) and the clear water area (5).

10. The novel air flotation device according to claim 9, characterized in that, It also includes a fixed plate (25), an adjustable baffle (26), a screw (27), and a turntable (28). The fixed plate (25) is located on the top of the overflow area (23) and has a through hole (29). The adjustable baffle (26) is located on the drainage channel (24) and is connected to the screw (27). The screw (27) passes through the through hole (29) and is threadedly connected to the turntable (28). Rotating the turntable (28) can drive the adjustable baffle (26) to rise and fall.

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