Fiber suspension generating device and air floating apparatus

Abstract

The utility model relates to wastewater treatment field, concretely relates to a kind of fiber suspension generating device and air floatation equipment, the device includes lower plate, the middle part of lower plate is connected with dissolved air water pipe, upper plate is provided above lower plate, gap is equipped between upper plate and lower plate, the upper end of upper plate is provided with medicine mixing bin, dosing hole is provided at the top of medicine mixing bin, and outlet is provided at the bottom, one end of gap is communicated with outlet and dissolved air water pipe, the other end is communicated with air floatation reaction zone;The fiber suspension generating device provided by the utility model has high integration, simplifies raw water treatment process flow and makes the whole air floatation equipment occupy small space, and air floatation reaction zone can be injected after dissolved air water and flocculant solution are uniformly mixed, significantly improve air floatation effect, and impurities in white water can be removed more thoroughly.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, specifically to a fiber suspension generating device and air flotation equipment that can uniformly mix micro-nano bubble water and flocculant solution. Background Technology

[0002] In the treatment of recycled white water from papermaking, dissolved air flotation (DAF) technology is commonly used. To allow fine fibers and other suspended matter in the white water to float to the surface, flocculants and other chemicals are first added to the white water, causing the suspended matter to flocculate. The flocculated white water then enters the dissolved air release zone. The bubbles generated by the released dissolved air mix with the flocculated white water and flow into the flotation zone. In the flotation zone, the flocculated suspended matter in the white water floats to the surface with the bubbles and is collected for further treatment. To achieve this process, the white water flotation equipment needs to be divided into a flocculation zone, a dissolved air release zone, and a flotation zone (or the zones may not be clearly defined, but the actual treatment process involves flocculation, mixing with dissolved air, and flotation), increasing the space occupied by the white water flotation equipment and extending the treatment process. Meanwhile, due to space constraints, the flocculant added to the system often cannot be mixed evenly with the white water. In particular, when a viscous flocculant solution is added to the water, it mainly relies on diffusion, resulting in slow mixing, low mixing efficiency, and insufficient reaction. This not only affects the flocculation effect but also leads to problems such as increased flocculant dosage and chemical residues in the treated clarifier.

[0003] In view of this, this utility model is hereby proposed. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a fiber suspension generating device and an air flotation equipment. This device has a high degree of integration and excellent air flotation effect, aiming to solve the problems of existing white air flotation equipment (equipment) having a large space occupation, lengthy white water treatment process, large amount of flocculant used and easy to generate residue, and poor air flotation effect.

[0005] To achieve the above objectives, this utility model provides the following technical solution: This utility model proposes a fiber suspension generating device, characterized in that it includes a lower plate, the middle part of which is connected to a dissolved air water pipe, an upper plate above the lower plate, a gap between the upper plate and the lower plate, a drug mixing chamber at the upper end of the upper plate, a drug addition port at the top of the drug mixing chamber, a drug outlet at the bottom, one end of the gap communicating with the drug outlet and the dissolved air water pipe, and the other end communicating with the air flotation reaction zone.

[0006] Using the device proposed in this utility model, dissolved air water enters the gap through the dissolved air water pipe, increasing the flow rate and generating negative pressure at the contact point with the drug outlet. The flocculant solution is carried away through the drug outlet. The bubble water containing micro-nano bubbles and the flocculant solution are uniformly mixed during the flow within the gap of the device, and then released into the air flotation reaction zone. This shortens the white water treatment process and reduces the space occupied by the white air flotation equipment (equipment). The white air flotation equipment (equipment) does not require an additional flocculation zone. In the air flotation reaction zone, the flocculant rapidly diffuses in the water with the micro-nano bubbles, increasing the contact area between the flocculant and the suspended matter in the water. This allows fine fibers and other suspended matter to fully react and flocculate with the flocculant, and then be promptly floated to the water surface by the micro-nano bubbles, significantly improving the air flotation effect and avoiding flocculant residue.

[0007] Furthermore, the gap is a labyrinthine gap, in which dissolved air water is continuously depressurized and released to form bubble water containing a large number of micro-nano bubbles. On the one hand, this can improve the density of bubbles in the air flotation reaction zone and the dispersibility of flocculants, significantly improving the air flotation effect. On the other hand, when the bubble water is mixed with the cationic flocculant solution, the cationic ions in the flocculant will be attracted by the negatively charged surface of the micro-nano bubbles and neutralize the original negative charge on the bubble surface. Moreover, it can also form an excessive positive charge layer on the surface of the micro-nano bubbles, causing the micro-nano bubbles to undergo charge reversal, or directly adsorb onto the surface area of ​​the micro-nano bubbles that were originally uncharged but have adsorption sites. This results in white water containing both positively and negatively charged micro-nano bubbles, which can effectively adhere to pollutants carrying different charges in the white water and make them float to the surface.

[0008] Furthermore, the upper end of the lower plate is provided with a first annular boss and a second annular boss. The first annular boss is fitted around the outlet of the dissolved air water pipe, and the second annular boss is fitted around the first annular boss. The lower end of the upper plate is provided with a third annular boss, a fourth annular boss, and a fifth annular boss. The fourth annular boss is fitted around the third annular boss, and the fifth annular boss is fitted around the fourth annular boss. The first and second annular bosses are staggered with the third, fourth, and fifth annular bosses. The space enclosed by the upper plate, the lower plate, the first annular boss, the second annular boss, the third annular boss, the fourth annular boss, and the fifth annular boss forms a labyrinthine gap.

[0009] Furthermore, the first annular boss is located between the third and fourth annular bosses, and the second annular boss is located between the fourth and fifth annular bosses.

[0010] Furthermore, the distances between the first annular boss and the third annular boss, the fourth annular boss, and the upper plate, as well as the distances between the second annular boss and the fourth annular boss, the fifth annular boss, and the upper plate, are all less than the distance between the upper plate and the lower plate.

[0011] Furthermore, the inner diameter of the dissolved air water pipe outlet is smaller than the inner diameter of the third annular boss.

[0012] Furthermore, the dispensing hole is located between the third annular boss and the first annular boss.

[0013] Furthermore, the drug mixing chamber includes a mixing chamber and a matching top cover, the top cover being provided with a drug addition port.

[0014] This utility model also proposes an air flotation device, including an air flotation reaction zone, which is connected to a white water conveying pipeline. The air flotation reaction zone is equipped with the aforementioned fiber suspension generating device. The dissolved air water pipe is connected to a dissolved air device outside the air flotation reaction zone. The dosing port is connected to a mixing tank.

[0015] Furthermore, multiple fiber suspension generating devices are spaced apart within the air flotation reaction zone.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) A gap is provided between the upper plate and the lower plate of this utility model. The dissolved air water pipe passes through the lower plate and communicates with the gap. The drug mixing chamber is integrated and set at the upper end of the upper plate. The bottom of the drug mixing chamber is provided with a drug outlet hole communicating with the gap. During use, the flocculant solution prepared in the mixing tank is pumped into the drug mixing chamber by a pressure pump. When the flocculant solution enters the mixing chamber, it will collide with the bottom of the mixing chamber, which will accelerate the maturation of the flocculant. At the same time, since the flow rate of the drug outlet is very small, the flocculant solution buffered in the mixing chamber can be further fully matured, thereby improving the flocculation effect. When the dissolved air water passes through the gap between the upper plate and the lower plate, the flow rate is relatively fast and the pressure is relatively low. A negative pressure is generated at the contact position with the drug outlet hole, and the flocculant solution is carried away through the drug outlet hole. The dissolved air water and the flocculant solution flow together in the gap and are mixed before being released into the air flotation reaction zone. This can improve the dispersion speed and uniformity of the flocculant in the white water, improve the air flotation effect, reduce the amount of flocculant used, and avoid flocculant residue.

[0017] (2) The gap between the upper plate and the lower plate of this utility model is a labyrinth. When the dissolved air water and the flocculant solution are mixed and flow in the labyrinth gap, a vortex effect will be generated at the corner. On the one hand, the pressure of the mixed liquid decreases sharply, and the air in the mixed liquid is released in the form of micro-nano bubbles, generating bubble water, which can improve the bubble density and flocculant dispersion in the air flotation reaction zone, thereby improving the air flotation effect. On the other hand, when the bubble water is mixed with the cationic flocculant solution, it can make the white water contain both positively charged micro-nano bubbles and negatively charged micro-nano bubbles. This can effectively adhere to pollutants carrying different charges in the wastewater and make them float to the surface, making the treatment of white water more thorough. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the fiber suspension generating device of this utility model; Figure 2 This is a front view of the fiber suspension generating device of this utility model; Figure 3 This is a top view of the fiber suspension generating device of this utility model; Figure 4 for Figure 3 Sectional view at point AA; Figure 5 for Figure 3 Cross-sectional view at point BB; Figure 6 This is a bottom view of the fiber suspension generating device of this utility model.

[0019] Reference numerals: 1. Dissolved gas water pipe; 2. Lower plate; 201. First annular boss; 202. Second annular boss; 3. Gap; 4. Upper plate; 401. Third annular boss; 402. Fourth annular boss; 403. Fifth annular boss; 5. Drug mixing chamber; 501. Dosing port; 502. Top cover; 503. Mixing chamber; 504. Drug outlet; 6. Connecting rib. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0021] Example 1 refer to Figures 1 to 6 This embodiment proposes a fiber suspension generating device, including a lower plate 2, the middle of which is connected to a dissolved air water pipe 1. An upper plate 4 is provided above the lower plate 2, and a gap 3 is provided between the upper plate 4 and the lower plate 2. The upper plate 4 and the lower plate 2 can be connected by a connecting structure such as a connecting rib 6 or a connecting column arranged at intervals. A drug mixing chamber 5 is provided at the upper end of the upper plate 4. A drug addition port 501 is provided at the top of the drug mixing chamber 5, and a drug outlet 504 is provided at the bottom. One end of the gap 3 is connected to the drug outlet 504 and the dissolved air water pipe 1, and the other end is connected to the air flotation reaction zone.

[0022] When using the fiber suspension generating device proposed in this embodiment, the fiber suspension generating device is set in the dissolved air water release zone of the air flotation equipment. The flocculant solution is pumped into the drug mixing chamber 5 from the dosing port 501 by a pressure pump. After the dissolved air device pumps the dissolved air water into the gap 3 between the upper plate 4 and the lower plate 2 through the dissolved air water pipe 1, the flow rate of the dissolved air water increases, and a negative pressure is formed at the contact point with the dosing port 504, which also carries the flocculant solution into the gap 3. After the dissolved air water and the flocculant solution flow and mix in the gap 3, they are released into the air flotation reaction zone. In the air flotation reaction zone, the air bubbles will carry the flocculant to be quickly and evenly dispersed in the white water, which increases the contact area between the flocculant and the suspended matter, allowing the flocculant and the suspended matter to react fully. This can significantly improve the air flotation effect, reduce the amount of flocculant used, and avoid flocculant residue.

[0023] refer to Figure 4 and Figure 5 In this embodiment, the gap 3 between the upper plate 4 and the lower plate 2 is preferably a labyrinth gap 3. When the mixture of dissolved air water and flocculant solution flows in the labyrinth gap 3, a vortex effect will be generated at the corner. On the one hand, the pressure of the mixture decreases sharply, and the air in the mixture is released in the form of micro-nano bubbles to form bubble water, which can increase the bubble density in the air flotation reaction zone and make the dissolved air water and flocculant solution mix more evenly. On the other hand, a "bubble-agent" copolymer is formed, so that the released micro-nano bubbles have both positive and negative surface charges, which can effectively adhere to pollutants with different charges in the wastewater and make them float to the surface. The flocculant copolymer carrying micro-nano bubbles is more evenly dispersed in the white water with the bubbles, and fully contacts and reacts with suspended matter such as fine fibers, further improving the air flotation effect, reducing the amount of flocculant used, and avoiding flocculant residue.

[0024] To create a labyrinthine gap 3 between the upper plate 4 and the lower plate 2, the upper end of the lower plate 2 is provided with a first annular boss 201 and a second annular boss 202. The first annular boss 201 is fitted around the outlet of the dissolved air water pipe 1, and the second annular boss 202 is fitted around the first annular boss 201. The lower end of the upper plate 4 is provided with a third annular boss 401, a fourth annular boss 402, and a fifth annular boss 403. The fourth annular boss 402 is fitted around the third annular boss 403. The fifth annular boss 403 is fitted around the fourth annular boss 402, surrounding the boss 401. The first and second annular bosses 201 and 202 are staggered with the third, fourth, and fifth annular bosses 401, 402, and 403. This creates a labyrinthine gap 3 within the space formed by the upper plate 4, lower plate 2, first annular boss 201, second annular boss 202, third annular boss 401, fourth annular boss 402, and fifth annular boss 403. Alternatively, other shapes of labyrinthine gaps 3 can be formed between the upper plate 4 and lower plate 2, as long as the purpose of this invention is achieved. For example, a multi-claw design could be used, with each claw forming a labyrinthine gap 3.

[0025] The staggered arrangement of the first annular boss 201 and the second annular boss 202 with the third annular boss 401, the fourth annular boss 402 and the fifth annular boss 403 can be determined according to the requirements. In this embodiment, the first annular boss 201 is located between the third annular boss 401 and the fourth annular boss 402, and the second annular boss 202 is located between the fourth annular boss 402 and the fifth annular boss 403.

[0026] To ensure rapid flow of dissolved air water within gap 3 and further increase the density of micro-nano bubbles in the flotation reaction zone, in this embodiment, the distance between the first annular protrusion 201 and the third annular protrusion 401, the fourth annular protrusion 402, and the upper plate 4 is less than the distance d between the upper plate 4 and the lower plate 2. Similarly, the distance between the second annular protrusion 202 and the fourth annular protrusion 402, the fifth annular protrusion 403, and the upper plate 4 is also less than the distance d between the upper plate 4 and the lower plate 2. Preferably, the distance between the first annular protrusion 201 and the third annular protrusion 402 is less than the distance d between the upper plate 4 and the lower plate 2. The distances between boss 401, fourth annular boss 402, and upper plate 4, and the distances between second annular boss 202 and fourth annular boss 402, fifth annular boss 403, and upper plate 4 are equal. The outlet of dissolved air water pipe 1 is opposite to the interior of third annular boss 401, and the inner diameter of the outlet of dissolved air water pipe 1 is smaller than the inner diameter of third annular boss 401. Thus, after the dissolved air water comes out of dissolved air water pipe 1, it first enters the third annular boss 401, and then flows out from the gap 3 between the third annular boss 401 and lower plate 2. Because the inner diameter of the outlet of dissolved air water pipe 1 is smaller than that of third annular boss 401, the dissolved air water will be depressurized instantly when it enters the third annular boss 401, causing some of the air in the dissolved air water to be released in the form of micro-nano bubbles. Because the distance between the third annular boss 401 and lower plate 2 is small, it can ensure that the dissolved air water flows rapidly in the labyrinthine gap 3, better carrying away the flocculant solution.

[0027] To further ensure that the dissolved air water and flocculant solution are mixed evenly before entering the dissolved air water release zone, the drug outlet 504 of the drug mixing chamber 5 is located between the third annular protrusion 401 and the first annular protrusion 201, ensuring that the flocculant solution has a longer distance to travel after being carried away and is fully mixed with the dissolved air water.

[0028] To facilitate the inspection and maintenance of the inside of the drug mixing chamber 5, the drug mixing chamber 5 in this embodiment includes a mixing chamber 503 and a top cover 502 that matches the mixing chamber 503. The top cover 502 is provided with a drug addition port 501. When it is necessary to clean or inspect the inside of the mixing chamber 503, the top cover 502 can be removed.

[0029] In order to firmly connect the upper plate 4 and the lower plate 2 without affecting the release of dissolved air water and flocculant solution, connecting ribs 6 can be set at intervals along the circumference of the edge of the lower plate 2. The lower end of the connecting rib 6 is fixedly connected to the lower plate 2, and the upper end can be directly connected to the upper plate 4 by bolts, or it can be connected to the upper plate 4 by the fifth annular boss 403, as long as it does not affect the release of liquid in the gap 3.

[0030] In this embodiment, the width of each part of the gap 3 can be designed according to factors such as dissolved air water flow rate and flow velocity. The shape of the upper plate 4 and the lower plate 2, as well as the number and shape of the annular protrusions, can be determined according to design requirements. In addition to flocculants, disinfectants and other chemicals can also be added through the drug mixing chamber 5 as needed. The flocculant solution is PAM solution or other types.

[0031] Example 2 This embodiment proposes an air flotation device, including an air flotation reaction zone connected to a white water conveying pipeline. A fiber suspension generating device as described in Embodiment 1 is installed within the air flotation reaction zone. A dissolved air water pipe 1 is connected to a dissolved air device outside the air flotation reaction zone. A dosing port 501 is connected to a mixing tank. Raw water treated by the dissolved air device enters the fiber suspension generating device through the dissolved air water pipe 1, and after treatment by the fiber suspension generating device, is released into the air flotation reaction zone. To ensure water treatment efficiency, multiple fiber suspension generating devices can be evenly spaced within the air flotation reaction zone, the number of which can be determined according to design requirements.

[0032] In the above embodiments, the dissolved gas device can be a dissolved gas pump, a device consisting of an air compressor and a pressure vessel, or other commercially available dissolved gas devices that meet the requirements.

[0033] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0034] It should be understood that this utility model is not limited to the content already described above, and modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A fiber suspension generating device, characterized in that, Includes a lower plate (2), the middle part of which is connected to the dissolved air water pipe (1), an upper plate (4) is provided above the lower plate (2), a gap (3) is provided between the upper plate (4) and the lower plate (2), a drug mixing chamber (5) is provided at the upper end of the upper plate (4), a drug addition port (501) is provided at the top of the drug mixing chamber (5), and a drug outlet (504) is provided at the bottom. One end of the gap (3) is connected to the drug outlet (504) and the dissolved air water pipe (1), and the other end is connected to the air flotation reaction zone.

2. The fiber suspension generating device according to claim 1, characterized in that, The gap (3) is a labyrinthine gap.

3. The fiber suspension generating device according to claim 2, characterized in that, The lower plate is provided with a first annular boss (201) and a second annular boss (202) at its upper end. The first annular boss (201) is fitted around the outlet of the dissolved air water pipe (1), and the second annular boss (202) is fitted around the first annular boss (201). The upper plate (4) is provided with a third annular boss (401), a fourth annular boss (402), and a fifth annular boss (403) at its lower end. The fourth annular boss (402) is fitted around the third annular boss (401), and the fifth annular boss... (403) is fitted around the fourth annular boss (402). The first annular boss (201) and the second annular boss (202) are arranged in a staggered manner with the third annular boss (401), the fourth annular boss (402) and the fifth annular boss (403). The space enclosed by the upper plate (4), the lower plate (2), the first annular boss (201), the second annular boss (202), the third annular boss (401), the fourth annular boss (402) and the fifth annular boss (403) forms a maze-like gap (3).

4. The fiber suspension generating device according to claim 3, characterized in that, The first annular boss (201) is located between the third annular boss (401) and the fourth annular boss (402), and the second annular boss (202) is located between the fourth annular boss (402) and the fifth annular boss (403).

5. The fiber suspension generating device according to claim 3, characterized in that, The distances between the first annular boss (201) and the third annular boss (401), the fourth annular boss (402), and the upper plate (4), as well as the distances between the second annular boss (202) and the fourth annular boss (402), the fifth annular boss (403), and the upper plate (4), are all less than the distance between the upper plate (4) and the lower plate (2).

6. The fiber suspension generating device according to claim 3, characterized in that, The inner diameter of the outlet of the dissolved air water pipe (1) is smaller than the inner diameter of the third annular boss (401).

7. The fiber suspension generating device according to claim 3, characterized in that, The dispensing hole (504) is located between the third annular boss (401) and the first annular boss (201).

8. The fiber suspension generating device according to claim 1, characterized in that, The drug mixing chamber (5) includes a mixing chamber (503) and a top cover (502) that matches the mixing chamber (503), and the top cover (502) is provided with a drug addition port (501).

9. An air flotation device, characterized in that, It includes an air flotation reaction zone, which is connected to a white water conveying pipeline. The air flotation reaction zone is equipped with a fiber suspension generating device as described in any one of claims 1 to 8. The dissolved air water pipe (1) is connected to a dissolved air device outside the air flotation reaction zone. The dosing port (501) is connected to a mixing tank.

10. The air flotation device according to claim 9, characterized in that, Multiple fiber suspension generating devices are spaced apart within the air flotation reaction zone.

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