Multifunctional steady-flow micro-nano release device and water treatment system

Abstract

The invention relates to the field of wastewater treatment, in particular to a multifunctional steady-flow micro-nano release device and a water treatment system.The device comprises a first-stage pressure reduction chamber, a primary mixing chamber and a release chamber, the first-stage pressure reduction chamber is communicated with an air dissolving water pipe, and a second-stage pressure reduction chamber is arranged between the first-stage pressure reduction chamber and the primary mixing chamber; a secondary vortex chamber is arranged between the primary mixing chamber and the release chamber, a medicine inlet hole is formed in the wall of the primary mixing chamber, and the sectional area of the primary mixing chamber and the sectional area of the release chamber are both larger than the sectional area of the secondary vortex chamber; according to the invention, continuous pressure reduction is carried out on air-dissolved water through the first-stage pressure reduction chamber and the second-stage pressure reduction chamber, bubbles released into the reaction zone from the release device are ensured to be high in density, small in size and uniform, so that the air flotation effect is improved, the multi-stage mixing chamber is also arranged, bubble water and a flocculant solution are uniformly mixed and then are released to the reaction zone through the release chamber, and the air flotation effect is improved. The reaction efficiency of the flocculating agent is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wastewater treatment, in particular to a multifunctional steady flow micro-nano release device and a water treatment system. BACKGROUND

[0002] A large amount of white water is generated in the papermaking process. In order to make the white water purified for recycling or to meet the discharge standard, air is dissolved in raw water by a dissolved air device to form dissolved air water, and then the dissolved air water is decompressed by a dissolved air release device to form micro-bubble water, which is discharged into the reaction zone of a water treatment system, and chemicals such as flocculants are added to the reaction zone to make the fine fibers flocculate into flocs and then float to the water surface by the bubbles. In the white water treatment process, the existing dissolved air release device does not fully decompress when releasing the dissolved air water, the released bubbles are large and have low density, and because the released water flow has high pressure, vortexes and turbulence are generated in the reaction zone, which affects the combination of bubbles and suspended solids in water, resulting in poor air floatation effect. In addition, the flocculant solution is directly added to the reaction zone through a pipeline, and the bubbles in the reaction zone are not uniformly mixed with the flocculant, which not only affects the air floatation effect, but also causes problems such as large amount of flocculant addition and chemical residue in the treated clear liquid.

[0003] Therefore, the present application is proposed. SUMMARY

[0004] In view of the problems existing in the prior art, the present application provides a multifunctional steady flow micro-nano release device and a water treatment system. The device releases micro-nano bubble water without generating vortexes and turbulence through multi-stage decompression and multi-stage mixing, the released micro-nano bubbles have small size and high density, and the micro-nano bubble water is fully mixed with the flocculant solution during the release process.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: The present application provides a multifunctional steady flow micro-nano release device, which comprises a primary decompression chamber, a primary mixing chamber and a release chamber. The primary decompression chamber is in communication with a dissolved air water pipe, and a secondary decompression chamber is arranged between the primary decompression chamber and the primary mixing chamber. A secondary vortex chamber is arranged between the primary mixing chamber and the release chamber, and a medicine inlet hole is arranged on the wall of the primary mixing chamber. The cross-sectional area of the primary mixing chamber and the cross-sectional area of the release chamber are both greater than the cross-sectional area of the secondary vortex chamber. The primary decompression chamber is in a cylindrical shape.

[0006] Further, the primary decompression chamber is arranged inside the primary mixing chamber, and a water inlet is arranged at the bottom of the primary decompression chamber. The dissolved air water pipe is connected to the bottom of the primary mixing chamber, and the water outlet of the dissolved air water pipe is opposite to the water inlet of the primary decompression chamber. The secondary decompression chamber is sleeved between the primary decompression chamber and the primary mixing chamber, and the lower end of the secondary decompression chamber is in communication with the water inlet of the primary decompression chamber, and the upper end of the secondary decompression chamber is in communication with the primary mixing chamber.

[0007] Furthermore, the outlet of the primary pressure reducing chamber is provided with an outer edge, and the lower surface of the outer edge is provided with a plurality of guide grooves along its radial direction.

[0008] Furthermore, one end of the secondary vortex chamber is connected to the side wall of the primary mixing chamber, and the other end is connected to the release chamber.

[0009] Furthermore, multiple secondary vortex chambers are arranged at circumferential intervals on the side wall of the primary mixing chamber.

[0010] Furthermore, there are multiple drug inlets, and each of the multiple drug inlets corresponds to a multiple secondary vortex chamber.

[0011] Furthermore, the junctions between the secondary vortex chamber and the primary mixing chamber, as well as the junctions between the secondary vortex chamber and the release chamber, are all smoothly transitioned.

[0012] Furthermore, a buffer chamber is provided at the upper end of the primary mixing chamber, and the drug inlet is provided on the top wall of the primary mixing chamber. The upper end of the buffer chamber is connected to the drug inlet pipe, and the lower end is connected to the primary mixing chamber through the drug inlet.

[0013] This embodiment also proposes a water treatment system, including a reaction zone, in which the above-mentioned release device is provided, and the dissolved air water pipe is connected to a dissolved air device outside the reaction zone.

[0014] Furthermore, multiple release devices are spaced apart within the reaction zone.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This invention continuously depressurizes dissolved air water through a primary depressurization chamber and a secondary depressurization chamber, causing the dissolved air water to rapidly generate drastic pressure changes, so that the dissolved gas is released in the form of micro-nano-scale bubbles with higher density. This ensures that the bubbles released from the release device into the reaction zone have high density, small size and uniformity, thereby improving the flotation effect. This invention also sets up a multi-stage mixing chamber. After the bubble water and flocculant solution are mixed in the primary mixing chamber, they flow through the secondary vortex chamber for further uniform mixing, and then are released into the reaction zone through the release chamber. The design of the primary mixing chamber, the secondary vortex chamber and the release chamber utilizes Bernoulli's principle. The water flows from a channel with a larger cross-section to a channel with a smaller cross-section and then to a channel with a larger cross-section. At the same time as the flow velocity changes, a strong shear layer is generated between the high-velocity and low-velocity fluids at the connection between the primary mixing chamber and the secondary vortex chamber, and at the connection between the secondary vortex chamber and the release chamber, thereby generating vortices in the secondary vortex chamber. This allows the flocculant solution and bubble water to be further fully mixed, increasing the contact area between the flocculant and impurities in the water, which shortens the mixing time and improves the reaction efficiency of the flocculant.

[0016] (2) The present invention designs a stable release zone after the secondary vortex mixing chamber. By the difference in cross-sectional size between the release chamber and the secondary vortex chamber, the flow velocity of the water entering the release chamber is reduced, and no jetting occurs. The smoothly released water flow does not disturb the surrounding water body and does not affect the adsorption effect of micro-nano bubbles on suspended substances in the water body.

[0017] (3) The present invention sets the first-level decompression chamber inside the primary mixing chamber, and the second-level decompression chamber is nested between the first-level decompression chamber and the primary mixing chamber. A buffer chamber is also set at the upper end of the primary mixing chamber to provide a maturation space for the flocculant, so that the flocculant entering the primary mixing chamber through the inlet hole has a high degree of maturation. The present invention achieves a high degree of integration of the entire release device and occupies a small space by arranging each area. Attached Figure Description

[0018] Figure 1 This is a top view of the release device of the present invention; Figure 2 for Figure 1 Sectional view at point AA; Figure 3 This is a schematic diagram of the internal structure of the primary mixing chamber of the present invention; Figure 4 This is a schematic diagram of the internal structure of the buffer chamber of the present invention.

[0019] Reference numerals: 1. Primary decompression chamber; 101. Outer edge; 102. Guide channel; 2. Secondary decompression chamber; 3. Primary mixing chamber; 4. Secondary vortex chamber; 5. Release chamber; 6. Dissolved gas water pipe; 7. Drug inlet; 8. Drug inlet pipe; 9. Buffer chamber. Detailed Implementation

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

[0021] Example 1 refer to Figure 1 and Figure 2 This embodiment proposes a multifunctional steady-flow micro / nano release device, characterized in that it includes a primary pressure-reducing chamber 1, a primary mixing chamber 3, and a release chamber 5. The primary pressure-reducing chamber 1 is connected to a dissolved air water pipe 6, and a secondary pressure-reducing chamber 2 is provided between the primary pressure-reducing chamber 1 and the primary mixing chamber 3. A secondary vortex chamber 4 is provided between the primary mixing chamber 3 and the release chamber 5, and a drug inlet hole 7 is provided on the wall of the primary mixing chamber 3. The cross-sectional area of ​​the primary mixing chamber 3 and the cross-sectional area of ​​the release chamber 5 are both larger than the cross-sectional area of ​​the secondary vortex chamber 4. The primary pressure-reducing chamber 1 is preferably cylindrical for easy processing.

[0022] In this embodiment, during use, the release device is installed in the reaction zone containing white water. The dissolved air water from the dissolved air device enters the primary decompression chamber 1 and the secondary decompression chamber 2 sequentially through the dissolved air water pipe 6 to achieve continuous decompression, generating drastic pressure changes. This causes the dissolved air in the water to be released in the form of micro-nano bubbles, forming bubble water. The released bubbles have high density, small size, and uniformity. The bubble water from the secondary decompression chamber 2 flows into the primary mixing chamber 3 and mixes with the flocculant solution flowing into the primary mixing chamber 3 through the drug inlet 7. The mixed dissolved air water and flocculant solution then flow from the primary mixing chamber 3 sequentially through the secondary vortex chamber 4. The water released from release chamber 5 enters the reaction zone of the water treatment system, causing suspended solids in the white water of the reaction zone to flocculate and float to the surface. As the bubble-infused water flows from the primary mixing chamber 3 through the secondary vortex chamber 4 and release chamber 5, due to the Bernoulli effect, the bubble-infused water and flocculant solution mix rapidly and uniformly before entering the reaction zone, increasing the contact area between the flocculant and impurities in the water. This shortens the mixing time and improves the reaction efficiency of the flocculant. When the mixture of bubble-infused water and flocculant solution enters release chamber 5 from the secondary vortex chamber 4, the difference in cross-sectional size between release chamber 5 and secondary vortex chamber 4 reduces the flow velocity of the water entering release chamber 5, preventing jetting in the reaction zone. The smoothly released bubble-infused water does not disturb the surrounding water body and does not affect the adsorption effect of micro-nano bubbles on suspended solids in the water.

[0023] refer to Figure 2 and Figure 3 To improve the integration of the release device, the primary pressure reducing chamber 1 is located inside the primary mixing chamber 3, and its top is connected to the top of the primary mixing chamber 3. The bottom of the primary pressure reducing chamber 1 is provided with a water inlet, and a gap is left between it and the bottom of the primary mixing chamber 3. The dissolved air water pipe 6 is connected to the bottom of the primary mixing chamber 3, and the outlet of the dissolved air water pipe 6 is opposite to the inlet of the primary pressure reducing chamber 1. Preferably, the diameter of the outlet of the dissolved air water pipe 6 is smaller than the size of the inlet of the primary pressure reducing chamber 1, so as to ensure that all the dissolved air water sprayed from the outlet can enter the primary pressure reducing chamber 1. The secondary pressure reducing chamber 2 is fitted between the primary pressure reducing chamber 1 and the primary mixing chamber 3, and its lower end is connected to the inlet of the primary pressure reducing chamber 1, and its upper end is connected to the primary mixing chamber 3. This design can not only ensure that the dissolved air water flows efficiently through the primary pressure reducing chamber 1 and the secondary pressure reducing chamber 2, but also save installation space.

[0024] In order to make the density of gas forming nanobubbles in dissolved air water higher, the outlet of the first-stage depressurization chamber 1 is provided with an outer edge 101. The lower surface of the outer edge 101 is provided with a plurality of guide grooves 102 along its radial direction. When the dissolved air water in the first-stage depressurization chamber 1 enters the second-stage depressurization chamber 2, it flows through the guide grooves 102, which can generate eddies, allowing more gas in the water to be released in the form of micro-nanobubbles.

[0025] One end of the secondary vortex chamber 4 is connected to the side wall of the primary mixing chamber 3, and the other end is connected to the release chamber 5. In order to improve the release efficiency and uniformity of dissolved air water, multiple secondary vortex chambers 4 are arranged circumferentially on the side wall of the primary mixing chamber 3. In order to further ensure that the dissolved air water and flocculant solution can be mixed uniformly, multiple drug inlet holes 7 are arranged at intervals on the top wall of the primary mixing chamber 3. The multiple drug inlet holes 7 correspond one-to-one with the multiple secondary vortex chambers 4. In this embodiment, the number of drug inlet holes 7 and the number of secondary vortex chambers 4 are 8 each.

[0026] The junctions between the secondary vortex chamber 4 and the primary mixing chamber 3, as well as between the secondary vortex chamber 4 and the release chamber 5, are preferably smooth transitions, allowing the flow rate of the mixture of bubble water and flocculant solution to change rapidly, thereby ensuring the uniformity of the mixture and the stable flow effect during release.

[0027] refer to Figure 2 and Figure 4 In this embodiment, a buffer chamber 9 is also provided at the upper end of the primary mixing chamber 3. The inlet hole 7 is located on the top wall of the primary mixing chamber 3. The upper end of the buffer chamber 9 is connected to the inlet pipe 8, and the lower end is connected to the primary mixing chamber 3 through the inlet hole 7. When adding flocculant, the flocculant is first prepared in the mixing tank and then injected into the buffer chamber 9 through the inlet pipe 6. Since the amount of flocculant solution in the buffer chamber 9 is much greater than the amount flowing out from the inlet hole 7, the flocculant solution in the buffer chamber 9 has enough time to mature. The matured flocculant can play a better flocculation effect in the reaction zone.

[0028] Example 2 This embodiment proposes a water treatment system, including a reaction zone. A release device as described in Embodiment 1 is installed within the reaction zone. A dissolved air water pipe 6 is connected to a dissolved air device outside the reaction zone, injecting white water into the reaction zone. The dissolved air device draws in raw water and then dissolves air in the raw water under pressure to form dissolved air water. The dissolved air water from the dissolved air device enters the release device through the dissolved air water pipe. A buffer chamber 9 is connected to a mixing tank via a chemical inlet pipe 8. The flocculant solution in the mixing tank enters the release device through the chemical inlet pipe 8. The mixed solution in the release device enters the reaction zone through the release chamber 5. To ensure water treatment efficiency and uniformity, multiple release devices can be spaced out within the reaction zone, the number of which can be determined according to design requirements.

[0029] In the above embodiments, the flocculant solution is a PAM solution or other types. The flocculant solution can also be replaced with disinfectants or other chemicals. 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.

[0030] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. 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 the invention.

[0031] It should be understood that the present invention is not limited to the content already described above, and modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A multifunctional constant-current micro / nano release device, characterized in that, It includes a primary decompression chamber (1), a primary mixing chamber (3) and a release chamber (5). The primary decompression chamber (1) is connected to a dissolved air water pipe (6). A secondary decompression chamber (2) is provided between the primary decompression chamber (1) and the primary mixing chamber (3). A secondary vortex chamber (4) is provided between the primary mixing chamber (3) and the release chamber (5). A drug inlet hole (7) is provided on the wall of the primary mixing chamber (3). The cross-sectional area of ​​the primary mixing chamber (3) and the cross-sectional area of ​​the release chamber (5) are both greater than the cross-sectional area of ​​the secondary vortex chamber (4). The primary decompression chamber is cylindrical.

2. The multifunctional constant-current micro / nano release device according to claim 1, characterized in that, The first-stage decompression chamber (1) is located inside the primary mixing chamber (3), and the bottom of the first-stage decompression chamber (1) is provided with a water inlet. The dissolved air water pipe (6) is connected to the bottom of the primary mixing chamber (1), and the outlet of the dissolved air water pipe is opposite to the inlet of the first-stage decompression chamber (1). The second-stage decompression chamber (2) is fitted between the first-stage decompression chamber (1) and the primary mixing chamber (3), and its lower end is connected to the inlet of the first-stage decompression chamber (1), and its upper end is connected to the primary mixing chamber (3).

3. The multifunctional constant-current micro / nano release device according to claim 2, characterized in that, The outlet of the primary pressure reducing chamber (1) is provided with an outer edge (101), and the lower surface of the outer edge (101) is provided with a plurality of guide grooves (102) along its radial direction.

4. The multifunctional constant-current micro / nano release device according to claim 1, characterized in that, One end of the secondary vortex chamber (4) is connected to the side wall of the primary mixing chamber (3), and the other end is connected to the release chamber (5).

5. The multifunctional constant-current micro / nano release device according to claim 4, characterized in that, Multiple secondary vortex chambers (4) are arranged circumferentially on the side wall of the primary mixing chamber (3).

6. The multifunctional constant-current micro / nano release device according to claim 5, characterized in that, There are multiple drug inlet holes (7), and each of the multiple drug inlet holes (7) corresponds to a multiple secondary vortex chambers (4).

7. The multifunctional constant-current micro / nano release device according to claim 4, characterized in that, The junctions between the secondary vortex chamber (4) and the primary mixing chamber (3) and between the secondary vortex chamber (4) and the release chamber (5) are all smoothly transitioned.

8. The multifunctional constant-current micro / nano release device according to claim 2, characterized in that, The primary mixing chamber (3) is provided with a buffer chamber (9) at its upper end. The drug inlet (7) is located on the top wall of the primary mixing chamber (3). The upper end of the buffer chamber (9) is connected to the drug inlet pipe (8), and the lower end is connected to the primary mixing chamber (3) through the drug inlet (7).

9. A water treatment system, characterized in that, It includes a reaction zone, in which a release device as described in any one of claims 1 to 8 is provided, and the dissolved gas water pipe is connected to a dissolved gas device outside the reaction zone.

10. The water treatment system according to claim 9, characterized in that, Multiple release devices are spaced apart within the reaction zone.

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