A micro-vortex piezoelectric oxidation and flocculation component

Abstract

The present application provides a micro-vortex piezoelectric oxidation and flocculation assembly, belonging to the technical field of flocculation or precipitation of suspended impurities in sewage and wastewater. It includes a cylinder installed in a grid flocculation tank. The cylinder is in the shape of an hourglass with both ends open, and its top opening and / or bottom opening are adaptively installed at the grid of the grid flocculation tank. A number of through holes communicating both sides of the side wall are provided on the side wall of the cylinder, and a piezoelectric coating is provided on the inner wall of the cylinder. The micro-vortex piezoelectric oxidation and flocculation assembly in this case combines both the optimized flocculation and enhanced coagulation strategies. Without destructive transformation of the original water purification plant, the micro-vortex technology can be introduced into it, saving costs; and the internal plating of the piezoelectric coating on the flocculation assembly can endow it with the function of in-situ enhanced coagulation, avoiding the risks and additional costs brought by external agents.

Description

Technical Field

[0001] The present application relates to a micro-vortex piezoelectric oxidation flocculation component, belonging to the technical field of flocculation or precipitation of suspended impurities in sewage and wastewater. Background Art

[0002] Flocculation is an indispensable process in conventional water treatment processes, mainly used to remove suspended solid impurities in water to reduce water turbidity. However, the deterioration of raw water quality and the continuous improvement of drinking water safety standards have posed great challenges to traditional flocculation technologies. To meet modern water supply requirements, some new flocculation technologies have been proposed and applied in actual production.

[0003] The development of flocculation technology can be divided into two directions. One is to optimize flocculation technology, such as optimizing the hydraulic conditions of common flocculation basins including partition flocculation basins, folded plate flocculation basins, mechanical agitation flocculation basins, grid / bar flocculation basins, etc., or developing new flocculation basins to improve the turbidity removal efficiency of water treatment structures; the other is to strengthen flocculation technology, such as adding excessive flocculants, new flocculants or coagulant aids, or other chemicals during flocculation treatment, and by strengthening the flocculation effect, making the conventional treatment process remove as much organic matter, precursors of disinfection by-products, and algae in water as possible.

[0004] For the optimization of flocculation technology, based on the fact that a large number of existing water purification plants cannot meet the current water quality standards, the general solution is to transform the existing flocculation basins. For example, by setting through holes with different orientations to form a vortex plate to optimize the flow field and flow pattern, but the final effect of this method is not significant. And demolishing the original flocculation basin and building a new micro-vortex flocculation basin has too high a cost and is difficult to balance high standards and economy.

[0005] For the strengthening of flocculation technology, although adding different chemical substances in water can greatly improve the flocculation effect of the flocculation basin, the chemical reaction by-products remaining in the water have brought pressure to the subsequent treatment process. Summary of the Invention

[0006] In view of this, the present application provides a micro-vortex piezoelectric oxidation flocculation component, which can be directly used in the existing grid flocculation basin to realize the transformation of its structure and working mechanism, with low investment cost and convenient use.

[0007] Specifically, the present application is realized through the following solutions:

[0008] A micro-vortex piezoelectric oxidation flocculation component includes a cylinder installed in a grid flocculation basin. The cylinder is in a sandglass-shaped structure with both ends not closed, and its top opening and / or bottom opening are adaptively installed at the grid of the grid flocculation basin. A number of through holes communicating both sides of the side wall are provided on the side wall of the cylinder.

[0009] The above solution uses a cylindrical body with an hourglass structure as the main component, which is installed in cooperation with a grid flocculation tank. When water flows through the grid, a part of the water overflows from the through holes and diffuses outward to form micro-vortices, thereby promoting the collision, aggregation, adsorption and flocculation of impurity particles in the water. Thus, the effect of enhanced flocculation is achieved by virtue of its special structure. Another part passes through the cylindrical body. During this process, due to the hourglass structure of the cylindrical body from the top opening to the bottom opening, the water flow shows the effect of repeated convergence and bunching when passing through, strengthening the intensity of the water flow. The flocculation component of the above solution can be directly installed on the grid of the grid flocculation tank (at this time, the top opening is connected to the grid, or the bottom opening is connected to the grid) or between the upper and lower layers of the grid (at this time, the top opening is connected to the upper layer of the grid, and the bottom opening is connected to the lower layer of the grid). Without changing the structure of the grid flocculation tank, the water flow can form a vortex around the component, realizing the enhancement and promotion of the flocculation effect, with simple operation and low use cost.

[0010] Furthermore, as a preference:

[0011] The cylindrical body has a stepped structure, and the side walls of its top opening towards the center of the cylindrical body and its bottom opening towards the center of the cylindrical body respectively form multiple steps. Installing the hourglass-shaped cylindrical body in the stepped form between the upper and lower layers of the grid, when the water flow passes through its interior, on the one hand, it will be gradually contracted under the control of the inner wall of the cylindrical body, and on the other hand, it will form a jet flow through the through holes, intensifying the collision of flocs, and effectively forming a turbulent flow of the water flow to optimize the flow pattern of the internal flow field of the water flow.

[0012] The cylindrical body includes an upper cylindrical body and a lower cylindrical body. Both the upper cylindrical body and the lower cylindrical body have a pagoda-shaped structure. The pagoda shape makes the cylindrical body present a multi-level structure. When the water flow enters the upper cylindrical body from the top opening of the upper cylindrical body, and then enters the top opening of the lower cylindrical body through the bottom opening of the upper cylindrical body, and finally is output through the bottom opening of the lower cylindrical body, the state of the water flow constantly changes in the vertical direction. With the jet action of the through holes opened on the side walls, it effectively promotes the contact between the water flow and the medicament.

[0013] The cylindrical body includes an upper cylindrical body and a lower cylindrical body. Both the upper cylindrical body and the lower cylindrical body are square pyramids. The square pyramids are stacked to form a pagoda-shaped structure, and the inside is set in a stepped shape. After the water flow enters the flocculation component, a part passes through from the top opening of the square pyramid, and another part passes out through the through holes on the surface of the square pyramid and forms micro-vortices, optimizing the flocculation effect.

[0014] The through holes are arranged perpendicular to the side walls or horizontally penetrate the side walls. The through holes are opened in a direction different from the direction of the gravity of the water flow, which is beneficial to promoting the jet action when the water flow overflows through the through holes.

[0015] The cylinder body further includes a mounting frame, and the cylinder body is installed in the grid of the grid flocculation tank through the mounting frame. More preferably, the grid flocculation tank includes a mesh plate and a plurality of grids formed by the mesh plate, and the mounting frame is fixed to the mesh plate to achieve a relatively detachable installation between the cylinder body and the grid.

[0016] One or more of the cylinder bodies are stacked and installed between the upper grid and the lower grid.

[0017] In the above solution, a piezoelectric coating is provided on the inner wall of the cylinder body. The water waves generated by the intense water flow in the cylinder body friction the piezoelectric coating on the inner wall of the cylinder body to generate a piezoelectric effect, and then generate active free radicals, which not only degrade soluble organic matter in water and reduce the subsequent treatment load, but also can destroy the algal cell wall, making it easier to be flocculated and settled by the flocculant, realizing in-situ enhanced flocculation. More preferably, the piezoelectric coating is a polyvinylidene fluoride composite molybdenum sulfide piezoelectric coating, and its composition method is as follows:

[0018] Step 1, weigh citric acid and urea and ultrasonically dissolve them in ultrapure water;

[0019] Step 2, transfer the solution obtained in the first step to a high-pressure reaction kettle and hydrothermally react to synthesize carbon quantum dots with high conductivity;

[0020] Step 3, dissolve sodium molybdate dihydrate and thiourea in 1-butyl-3-methylimidazolium chloride;

[0021] Step 4, dilute hydrochloric acid and add the solution obtained in Step 2 to it;

[0022] Step 5, dropwise add the solution obtained in Step 4 into the solution obtained in Step 3 under strong stirring;

[0023] Step 6, transfer the solution obtained in Step 5 to a high-pressure reaction kettle, filter, wash, dry and crush the product obtained by hydrothermal reaction to obtain carbon quantum dot-doped molybdenum sulfide;

[0024] Step 7, dissolve polyvinylidene fluoride powder in N,N-dimethylformamide, and add the product obtained in Step 6 to it for ultrasonic dispersion after the solution is clarified;

[0025] Step 8, pour the suspension obtained by dispersing in Step 7 along the side wall into the flocculation component until the inside is gradually completely covered with the suspension;

[0026] Step 9, immerse the flocculation component obtained in Step 8 in ultrapure water for soaking, use the phase inversion of polyvinylidene fluoride in water to fix the carbon quantum dot-doped molybdenum sulfide and coat the film inside the flocculation component to obtain the piezoelectric coating.

[0027] The above method not only realizes the turbulent flow in the flocculation process, but also realizes the piezoelectric effect, and combines the two strategies of optimizing flocculation and strengthening flocculation. Without modifying the existing equipment, micro-vortex turbulent flow can be introduced into the flocculation treatment, with low cost; and the setting of the piezoelectric coating also realizes in-situ strengthening of flocculation, without adding external drugs, and there is no risk and additional cost caused by adding external drugs. Description of the Drawings

[0028] Figure 1 Schematic three-dimensional structure diagram of the present application;

[0029] Figure 2 Top view of the present application;

[0030] Figure 3 Side view of the present application;

[0031] Figure 4 Schematic diagram of the usage state of the present application;

[0032] Figure 5 Another schematic diagram of the usage state of the present application;

[0033] Figure 6 Side view of another usage state of the present application;

[0034] Figure 7 Schematic diagram of the working principle of the present application.

[0035] Reference numerals in the drawings: 1. upper cylinder; 11. first large section; 12. first small section; 13. upper mounting frame; 14. first step; 15. second step; 16. bottom opening; 2. lower cylinder; 21. second large section; 22. second small section; 23. lower mounting frame; 24. threaded hole; 3. piezoelectric coating; 4. through hole; 5. grid flocculation tank; 5a. upper layer grid; 5b. lower layer grid; 51. grid; 52. mesh plate. Detailed Implementation Modes Example 1

[0036] A micro-vortex piezoelectric oxygen flocculation component in this example is combined with Figure 1 . This component is a barrel in the shape of an hourglass with both ends open, and the top opening and / or bottom opening of the barrel is adaptively installed at the grid of the grid flocculation tank. A number of through holes 4 are provided on the side wall of the barrel to connect the inside and outside of the barrel on both sides of the side wall, and a piezoelectric coating 3 is provided on the inner wall of the barrel. In this solution, the through hole 4 can be set as a micro-hole with a diameter d of 15 mm.

[0037] The above solution takes the barrel in the shape of an hourglass as the main body of the component in this case, and installs it in cooperation with the grid flocculation tank 5, combined with Figure 4When water flows through the grid 51, a part of the water flows out of the through hole 3 in the direction of the arrow and diffuses outward to form micro-eddies, thereby promoting the collision, agglomeration and adsorption flocculation of impurity particles in the water. In this way, the special structure achieves the effect of enhanced flocculation. The other part passes through the cylinder 1. The water waves generated by the intense water flow in the cylinder rub the piezoelectric coating 3 on the inner wall of the cylinder to produce a piezoelectric effect, thereby generating active free radicals, which not only degrades soluble organic matter in the water and reduces the subsequent treatment load, but also destroys the algae cell wall, making it easier to be flocculated and settled by the flocculant, thereby achieving in-situ enhanced flocculation. In this process, due to the hourglass structure of the cylinder from the top opening (not marked in the figure) to the bottom opening 16, the water flow presents a repeated contraction and bunching effect when passing through, thereby enhancing the intensity of the water flow.

[0038] The flocculation component of the above scheme can be directly installed on the grid 51 of the grid flocculation tank 5 without changing the structure of the grid flocculation tank 5, so that the water flow can form a vortex around the component, thereby enhancing and promoting the flocculation effect, being easy to operate and having low use cost. Example 2

[0039] The configuration of this embodiment is the same as that of embodiment 1, except that: Figure 2 and Figure 3 The cylinder can adopt a stepped structure, with multiple steps arranged in the inner wall, such as Figure 2 As shown, step 14 and step 2 15 provided on the inner wall of the cylinder form two steps, and water flows out through the top opening, step 14, step 2 15, and bottom opening 16 in sequence.

[0040] The above scheme is characterized by an overall hourglass shape and a stepped shape on the inside. When the cylinder is installed in the grid flocculation tank 5, the water flows through the inside thereof. On the one hand, it will be controlled by the hourglass structure of the cylinder and gradually shrink. On the other hand, it will form a jet shape through the through hole 4, intensifying the collision of the flocs, which can effectively form a turbulent flow in the water flow and optimize the internal flow field and flow state of the water flow. Example 3

[0041] The configuration of this embodiment is the same as that of embodiment 1, except that: Figure 1 and Figure 3 The cylinder includes an upper cylinder 1 and a lower cylinder 2. Both the upper cylinder 1 and the lower cylinder 2 are pagoda-shaped structures. The pagoda shape makes the cylinder present a multi-level structure.

[0042] The water first enters the upper cylinder 1 from the top opening of the upper cylinder 1, then enters the top opening of the lower cylinder 2 through the bottom opening 16 of the upper cylinder 1, and is finally output through the bottom opening of the lower cylinder 2, so that the flow state of the water flow in the vertical direction constantly changes, and the jet effect of the through hole 4 opened in the side wall effectively promotes the contact between the water flow and the medicine.

[0043] In the above solution, the upper cylinder 1 and the lower cylinder 2 can also adopt a square pyramid structure. Two square pyramids are stacked to form a pagoda-shaped structure, and the inside is set in a stepped shape. After the water flow enters this flocculation component, a part of it passes through the opening at the top of the square pyramid, and the other part passes through the through holes 4 on the surface of the square pyramid and forms micro-vortices, optimizing the flocculation effect.

[0044] A conventional grid flocculation tank 5 generally includes a net plate 52 and a number of grids 51 formed by the intersection of the net plates 52, Figure 4 Taking the grid 51 with a side length D of 100 mm (100×100 mm) as an example, the distance H between two layers of grids can be set to be around 120 mm. Combining Figure 3 , the cone angle θ of the square pyramid is 60°. Both the upper cylinder 1 and the lower cylinder 2 include a large section and a small section: the large section 11 is square, with a side length D1 of 100 mm (i.e., 100×100 mm) and a height H1 of 30 mm; the small section 12 is square, with a side length D2 of 80 mm (i.e., 80×80 mm) and a height H2 of 30 mm; the large section 21 is the same as the large section 11 in specifications, and the small section 22 is the same as the small section 12 in specifications. The total height H3 of the cylinder is 120 mm. Fix the top of the upper cylinder 1 at the upper layer grid 5a, and fix the bottom of the lower cylinder 2 at the corresponding lower layer grid 5b. When the water flow enters the grid flocculation tank, the water flow passes through the grid 51 of the grid flocculation tank and enters the upper cylinder 1 through the top opening, then flows out through the bottom opening 16, the top opening of the lower cylinder 2, and the bottom opening of the lower cylinder, and is repeatedly converged and diffused in this process; at the same time, under the constraint of the pagoda structure of the cylinder, the water flow is sent out in a jet form through the through holes 4 on the side wall and interacts with the water flow outside the cylinder to form micro-vortices.

[0045] In the above solution, the through holes 4 can be directly set in a way perpendicular to the side wall, or can be set in a way that horizontally penetrates the side wall. The through holes 4 are opened in a direction different from the direction of the water flow gravity, which is beneficial to promoting the jet action when the water flow overflows through the through holes.

[0046] For the convenience of installing the component, an installation frame can also be set, such as Figure 2 the upper installation frame 13 and the lower installation frame 23 in [[ ]]. The cylinder is fixed to the upper layer grid 5a through the upper installation frame 13 and fixed to the lower layer grid 5b through the lower installation frame 23, realizing the installation of the cylinder in the grid 5 of the grid flocculation tank 5; when the flocculation component does not need to be used or needs to be replaced, the relative detachable installation of the cylinder and the grid 51 can be realized by screwing out screws and the like from the threaded holes 24.

[0047] During installation, when the distance H between the upper layer grid 5a and the lower layer grid 5b happens to be adaptable to the total height H3 of the entire cylinder, it can be like Figure 3 、 Figure 4As shown in the figure, a cylinder is arranged between the upper grid 5a and the lower grid 5b. At this time, the top opening is connected to the upper grid 5a through the upper mounting bracket 13, and the bottom opening 16 is connected to the lower grid 5b through the lower mounting bracket 23.

[0048] When the distance H between the upper grid 5a and the lower grid 5b is not exactly compatible with the height H3 of a single cylinder, either only the top opening can be connected to the grid 51 through the upper mounting bracket 13, or only the bottom opening 16 can be connected to the grid 51 through the lower mounting bracket 23; it is also possible to Figures 5 to 7 As shown in the figure, multiple cylinders are arranged. The multiple cylinders are stacked and installed between the upper grid 5a and the lower grid 5b, as shown in Figure 5 、 Figure 6 For two cylinders stacked, there are two upper cylinders 1 and two lower cylinders 2 in the structure. Correspondingly, there are also two large sections 11 and small sections 12, and two large sections 21 and small sections 22. At this time, the distance H is approximately twice the height H3 of the cylinder (that is, H3 is about 120 mm and H is around 240 mm).

[0049] When multiple cylinders are stacked, the lower connecting part of the upper cylinder is connected to the upper connecting part of the lower cylinder to complete the stacking and fixing.

[0050] In the above solution, the piezoelectric coating 3 can adopt a polyvinylidene fluoride composite molybdenum disulfide piezoelectric coating, and its cooperation process with the above cylinder is as follows:

[0051] Step 1: Weigh 3 g of citric acid and 1 g of urea, and dissolve them ultrasonically in 50 mL of ultrapure water;

[0052] Step 2: Transfer the solution obtained in Step 1 to a high-pressure reaction kettle, and carry out a hydrothermal reaction at 180 °C for 5 h to synthesize carbon quantum dots with high conductivity;

[0053] Step 3: Dissolve 0.72 g of sodium molybdate dihydrate and 0.69 g of thiourea in 1 mL of 1-butyl-3-methylimidazolium chloride with a concentration of 1 M;

[0054] Step 4: Dilute 1 ml of hydrochloric acid to 60 mL, and add 500 μL of the solution obtained in Step 2 to it;

[0055] Step 5: Dropwise add the solution obtained in Step 4 into the solution obtained in Step 3 under strong stirring;

[0056] Step 6: Transfer the solution obtained in Step 5 to a high-pressure reaction kettle, carry out a hydrothermal reaction at 220 °C for 24 h, filter, wash, dry, and crush the obtained product to obtain carbon quantum dot-doped molybdenum disulfide;

[0057] Step 7: Dissolve 5 g of polyvinylidene fluoride powder in 45 g of N,N-dimethylformamide. After the solution becomes clear, add the product obtained in Step 6 and ultrasonically disperse for 2 h.

[0058] Step 8: Pour the suspension obtained by dispersion in Step 7 along the side wall into the flocculation assembly until the interior is gradually completely covered with the suspension.

[0059] Step 9: Immerse the flocculation assembly obtained in Step 8 in ultrapure water and soak for 5 min. Use the phase inversion of polyvinylidene fluoride in water to fix carbon quantum dot-doped molybdenum sulfide and coat the interior of the flocculation assembly to obtain the piezoelectric coating.

[0060] The above method not only realizes the turbulent flow in the flocculation process, but also realizes the piezoelectric effect. At the same time, it combines the two strategies of optimizing flocculation and strengthening flocculation. Without modifying the existing equipment, micro-vortex turbulent flow can be introduced into the flocculation treatment, with low cost; and the setting of the piezoelectric coating also realizes in-situ strengthening of flocculation, without adding external agents, and there are no risks and additional costs caused by adding external agents.

Claims

1. A micro-vortex piezoelectric oxidation and flocculation component, characterized in that: It includes a cylinder installed in a grid flocculation tank. The cylinder is in the shape of an hourglass with both ends open, and its top opening and / or bottom opening are adaptively installed at the grid of the grid flocculation tank. A number of through holes communicating both sides of the side wall are provided on the side wall of the cylinder. A piezoelectric coating is provided on the inner wall of the cylinder. The piezoelectric coating is a polyvinylidene fluoride composite molybdenum sulfide piezoelectric coating, and the forming process is as follows: Step 1, weigh citric acid and urea and ultrasonically dissolve them in ultrapure water. Step 2, transfer the solution obtained in the first step to a high-pressure reaction kettle and hydrothermally react to synthesize carbon quantum dots with high conductivity. Step 3, dissolve sodium molybdate dihydrate and thiourea in 1-butyl-3-methylimidazolium chloride. Step 4, dilute hydrochloric acid and add the solution obtained in Step 2 to it. Step 5, dropwise add the solution obtained in Step 4 into the solution obtained in Step 3 under strong stirring. Step 6, transfer the solution obtained in Step 5 to a high-pressure reaction kettle, filter, wash, dry and crush the product obtained by hydrothermal reaction to obtain carbon quantum dot-doped molybdenum sulfide. Step 7, dissolve polyvinylidene fluoride powder in N,N-dimethylformamide, and add the product obtained in Step 6 to it for ultrasonic dispersion after the solution becomes clear. Step 8, pour the suspension obtained by dispersing in Step 7 along the side wall into the flocculation component until the inside is gradually completely covered with the suspension. Step 9, immerse the flocculation component obtained in Step 8 in ultrapure water for soaking, and use the phase inversion of polyvinylidene fluoride in water to fix the carbon quantum dot-doped molybdenum sulfide and coat the inside of the flocculation component, that is, obtain a micro-vortex piezoelectric oxidation flocculation component with a piezoelectric coating.

2. The micro-vortex piezoelectric oxidation and flocculation assembly according to claim 1, characterized in that: The cylinder is in a stepped structure, and the side walls of its top opening towards the center of the cylinder and bottom opening towards the center of the cylinder respectively form multiple steps.

3. The micro-vortex piezoelectric oxidation and flocculation assembly according to claim 1, characterized in that: The cylinder includes an upper cylinder and a lower cylinder, and both the upper cylinder and the lower cylinder are in the shape of a pagoda.

4. A micro-vortex piezoelectric oxidation and flocculation assembly according to claim 1, characterized in that: The cylinder includes an upper cylinder and a lower cylinder, both the upper cylinder and the lower cylinder are square pyramids, and the square pyramids are stacked to form a pagoda-shaped structure, and the inside is set in a stepped shape.

5. The micro-vortex piezoelectric oxidation and flocculation assembly according to claim 1, characterized in that: The through holes are arranged perpendicular to the side wall or horizontally penetrate the side wall.

6. The micro-vortex piezoelectric oxidation and flocculation assembly according to claim 1, characterized in that: The cylinder further includes a mounting rack, and the cylinder is installed in the grid of the grid flocculation tank through the mounting rack.

7. The micro-vortex piezoelectric oxidation and flocculation assembly according to claim 6, wherein: The grid flocculation tank includes a mesh plate and a number of grids formed by the intersection of the mesh plates. The installation method of the cylinder and the grid flocculation tank selects any one of the following three: The first one, an upper mounting rack is provided at the top opening, and the upper mounting rack is connected to the mesh plate. The second one, a lower mounting rack is provided at the bottom opening, and the lower mounting rack is connected to the mesh plate. The third one, an upper mounting rack is provided at the top opening, a lower mounting rack is provided at the bottom opening, the upper connecting rack is connected to the upper grid, and the lower connecting rack is connected to the lower grid.

8. The micro-vortex piezoelectric oxidation and flocculation assembly according to claim 7, wherein: One or more of the cylinders are stacked and installed between the upper grid and the lower grid.

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