Photocatalytic wastewater treatment device

Abstract

The invention relates to a photocatalytic wastewater treatment device which is characterized in that the photocatalytic wastewater treatment device comprises a multi-section cross flow mixing pipeline, an ultrasonic tank and a photocatalytic reactor, and the photocatalytic reactor is composed of a tubular reactor provided with an ultraviolet lamp and a baffle embedded in the tubular reactor; wherein the cross-flow mixing pipelines are distributed in a tree shape, each cross-flow mixing pipeline comprises a water inlet main pipeline, a branch pipe and a water outlet main pipeline, wastewater enters from the water inlet main pipeline and enters the branch pipes through multi-stage shunting, and materials in the branch pipes enter the water outlet main pipelines through multi-stage cross convergence and enter the adjacent cross-flow mixing pipelines. The thought of combining the micro-channel reactor and the Tesla valve is adopted, a liquid-liquid or gas-liquid mixture is subjected to multi-stage shunting and then converged, materials can be effectively promoted to be uniformly mixed, and the design can meet various mixing requirements of liquid-liquid mixing, liquid-gas mixing and liquid-liquid-gas mixing.

Description

Technical Field

[0001] This application belongs to the field of photocatalytic materials and wastewater treatment technology, specifically relating to a high-efficiency photocatalytic reaction device that can uniformly mix liquid-liquid, gas-liquid, and liquid-gas-liquid media. Background Technology

[0002] The photocatalytic wastewater treatment process first requires ultraviolet light to excite the oxidant and generate oxidizing free radicals. Therefore, the mixing effect between the oxidant and the wastewater is closely related to the treatment effect. Oxidants are usually in liquid or gaseous state, and the photocatalytic wastewater treatment process involves liquid-liquid, gas-liquid, or liquid-gas-liquid mixing. Conventional liquid-liquid mixing uses a single pipe mixer or tank stirring method, resulting in poor mixing efficiency and inability to achieve the desired effect in a short time. Gas-liquid mixing typically uses aeration or Venturi tubes, but the bubbles in the water are relatively large, leading to low gas utilization.

[0003] The internal space of a photocatalytic tubular reactor is limited. Without water distribution treatment, eddies will form in the internal flow field, making it impossible to effectively utilize the internal space. Commonly used water distribution baffles are baffles with uniform orifice diameter and density. These baffles have three problems: First, if the orifice diameter is large, water will flow out from the lower part of the baffle, and the top of the baffle is a cavity, resulting in uneven water distribution and ineffective utilization of the internal space. Second, if the orifice diameter is small, although water distribution can be more uniform, the pressure at the baffle is too high, which places higher demands on the materials and manufacturing process of the device, and also increases energy consumption. Third, commonly used water distribution baffles do not have orifices on the outermost side, which further reduces the already low near-wall fluid velocity, making it unfavorable for uniform flow field distribution. Summary of the Invention

[0004] This application aims to address the problems mentioned in the background section.

[0005] The present invention provides a photocatalytic wastewater treatment device, characterized in that it comprises a multi-section cross-flow mixing pipe, an ultrasonic tank and a photocatalytic reactor, wherein the photocatalytic reactor comprises a tubular reactor equipped with an ultraviolet lamp and a baffle embedded inside the tubular reactor. The cross-flow mixing pipes are arranged in a tree-like pattern. The cross-flow mixing pipes include an inlet main pipe, branch pipes, and an outlet main pipe. Wastewater enters through the inlet main pipe, is diverted through multiple stages, enters the branch pipes, and the material in the branch pipes is then converged through multiple stages to enter the outlet main pipe and then enters the adjacent cross-flow mixing pipes.

[0006] In one specific embodiment, each branch pipe converging point is provided with a side channel, which is used to reduce water flow resistance and prevent backflow after water flow converges; wherein the included angle between the two branch pipes at the branch pipe converging point is 15-45 degrees.

[0007] In one specific embodiment, the inlet of the first cross-flow mixing pipe is provided with two inlet pipes, one of which is equipped with a venturi tube and is used for liquid-gas mixing, and the other inlet pipe is equipped with a pipe mixer for liquid-liquid mixing.

[0008] In one specific embodiment, the ultrasonic tank is a closed water tank with ultrasonic rods arranged inside, the front end of the ultrasonic tank is connected to a cross-flow mixing pipe, and the rear end is connected to a photocatalytic reactor.

[0009] In one specific embodiment, the photocatalytic reactor is a tubular reactor with water entering from one side and exiting from the other side. A water distribution baffle is arranged at the water inlet end and an outlet baffle is arranged at the water outlet end.

[0010] In one specific embodiment, the opening areas of the water distribution baffle and the water outlet baffle are divided into four regions according to the change of cross-sectional pressure. The regions are named as the first region, the second region, the third region, and the fourth region respectively, from low to high pressure. The openings in each region correspond to different diameters. The aperture of the first region is between the minimum and maximum diameters, the second region is the minimum diameter aperture, the third region is the maximum diameter aperture, and the fourth region is a fully open region.

[0011] In one specific embodiment, the first region is from the bottom of the baffle to 1 / 4-1 / 5 of its height, the second region is from 1 / 4-1 / 5 of its height to 3 / 5-3 / 4 of its height, the third region is from 3 / 5-3 / 4 of its height to 4 / 5-3.5 / 4 of its height, and the fourth region is from 4 / 5-3.5 / 4 of its height to the top.

[0012] In one specific embodiment, the water distribution baffle and the water outlet baffle have semi-circular openings at the connection points with the tubular reactor, and the diameter of the openings is consistent with the corresponding area. The water distribution baffle and the water outlet baffle have elliptical openings at their bottoms. The height of the openings is 1%-2.5% of the total height of the water outlet baffles, and the width of the openings is 2-5 times the height of the openings.

[0013] The total open area of ​​the water distribution baffle is 2%-10% of the total baffle area, and the total open area of ​​the water outlet baffle is 5%-20% of the total baffle area. Beneficial effects

[0014] (1) By combining a microchannel reactor with a Tesla valve, liquid-liquid or gas-liquid mixtures are diverted and then reconverged in multiple stages, which can effectively promote uniform mixing of materials. Setting a side channel similar to a Tesla valve at the material cross-convergence point can significantly reduce pipeline resistance and prevent material backflow. The multi-stage diversion and reconvergence method improves the mixing tolerance, and good mixing can be achieved even if the device manufacturing precision is slightly poor. Moreover, this design can meet various mixing requirements such as liquid-liquid mixing, liquid-gas mixing, and liquid-liquid-gas mixing.

[0015] (2) After the material is cross-mixed in multiple stages, it enters the ultrasonic tank, which has many beneficial effects such as further homogenizing the material, further dispersing microbubbles, and making pollutants more hydrophilic.

[0016] (3) The water distribution baffle is divided into multiple zones according to the cross-sectional pressure, with each zone corresponding to a different orifice diameter, which can make the flow rate of each zone more consistent and significantly improve the water distribution effect; a semi-circular orifice is arranged at the outermost contact point of the baffle with the reactor wall, which can effectively increase the material flow velocity near the wall and balance the flow field distribution. In addition, an elliptical orifice is set at the bottom of the baffle to completely drain the reaction water and reduce the direct influence between different batches of experiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a photocatalytic treatment device according to the present invention; Figure 2 This is a front view of the cross-flow mixing pipe in this invention; Figure 3 This is a front view of the water distribution baffle in this invention; Figure 4 This is the main view of the water outlet baffle in this invention.

[0018] Wherein: 1-Inlet pipe; 2-Venturi tube; 3-Another inlet pipe; 4-Pipe mixer; 5-Valve; 6-Cross-flow mixing pipe; 7-Pipe; 8-Ultrasonic tank; 9-Ultrasonic rod; 10-Photocatalytic reactor inlet; 11-UV lamp; 12-UV lamp tube seal; 13-Water distribution baffle; 14-Outlet baffle; 15-Photocatalytic reactor outlet; 16-First-stage diversion port; 17-Second-stage diversion port; 18-Third-stage diversion port; 19-First-stage confluence port; 20-Second-stage confluence port; 21-Third-stage confluence port; 22-Side channel of confluence port; 23-First zone; 24-Second zone; 25-Third zone; 26-Fourth zone; 27-Water distribution baffle opening; 28-Water distribution baffle elliptical hole; 29-Outlet baffle opening; 30-Outlet baffle elliptical hole. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "counterclockwise," "clockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example

[0022] See Figures 1-4 The present invention discloses a photocatalytic wastewater treatment device comprising a multi-section cross-flow mixing pipe, an ultrasonic tank 8, and a photocatalytic reactor. The photocatalytic reactor consists of a tubular reactor equipped with an ultraviolet lamp 11 and a baffle embedded inside the tubular reactor. The ultraviolet lamp 11 is equipped with an ultraviolet lamp seal 12 for waterproofing. The cross-flow mixing pipe is arranged in a tree-like pattern and includes an inlet main pipe, branch pipes, and an outlet main pipe. Wastewater enters through the inlet main pipe, undergoes multi-stage diversion into the branch pipes, and the material in the branch pipes then undergoes multi-stage cross-convergence into the outlet main pipe and enters the adjacent cross-flow mixing pipe.

[0023] See Figure 1 Each branch pipe converging point is provided with a side channel, which is used to reduce water flow resistance and prevent backflow after water flow converges; the included angle between the two branch pipes at the converging point is 15-45 degrees.

[0024] See also Figure 1The first cross-flow mixing pipeline has two inlet pipes 1 at its inlet. One inlet pipe 1 is equipped with a venturi tube 2. The pipes 7 are connected to each other by a valve 5 and are used for liquid-gas mixing. The other inlet pipe 3 is equipped with a pipe mixer 4 for liquid-liquid mixing. The multi-section cross-flow mixing pipeline includes a primary diversion port 16, a secondary diversion port 17, a tertiary diversion port 18, a primary convergence port 19, a secondary convergence port 20, a tertiary convergence port 21, and a convergence port side channel 22.

[0025] The ultrasonic tank 8 is a closed water tank with ultrasonic rods 9 arranged inside. The front end of the ultrasonic tank 8 is connected to a cross-flow mixing pipe, and the rear end is connected to a photocatalytic reactor.

[0026] See Figure 1 The photocatalytic reactor is a tubular reactor with water entering from one side and exiting from the other side. The photocatalytic reactor has a photocatalytic reactor inlet 10 and an outlet 15. A water distribution baffle 13 is arranged at the water inlet end of the reactor, and an outlet baffle 14 is arranged at the water outlet end.

[0027] See Figure 2 The opening areas of the water distribution baffle 13 and the water outlet baffle 14 are divided into four regions according to the change of cross-sectional pressure. The regions are named as first region 23, second region 24, third region 25 and fourth region 26 respectively, from low to high pressure. The openings in each region correspond to different diameters. The aperture of the first region is between the minimum and maximum diameters, the second region is the minimum diameter aperture, the third region is the maximum diameter aperture, and the fourth region is a fully open region.

[0028] See Figure 3 The first area is from the bottom of the baffle to 1 / 4-1 / 5 of its height; the second area is from 1 / 4-1 / 5 of its height to 3 / 5-3 / 4 of its height; the third area is from 3 / 5-3 / 4 of its height to 4 / 5-3.5 / 4 of its height; and the fourth area is from 4 / 5-3.5 / 4 of its height to the top.

[0029] See Figure 3 and Figure 4 The water distribution baffle 13 and the water outlet baffle 14 have water distribution baffle openings 27 and 29 at their connection with the tubular reactor, with the opening diameters consistent with their respective areas. The bottom of the water distribution baffle 13 and the water outlet baffle 14 have elliptical water distribution baffle openings 28 and elliptical water outlet baffle openings 30, with opening heights of 1%-2.5% of the total height of the water outlet baffle 14 and opening widths of 2-5 times the opening height. The total opening area of ​​the water distribution baffle 13 is 2%-10% of the total baffle area, and the total opening area of ​​the water outlet baffle 14 is 5%-20% of the total baffle area.

[0030] This embodiment of the photocatalytic wastewater treatment device employs a combination of a microchannel reactor and a Tesla valve. The liquid-liquid or gas-liquid mixture undergoes multi-stage diversion and reconvergence, effectively promoting uniform material mixing. Side channels, similar to Tesla valves, are installed at the material cross-convergence points to significantly reduce pipeline resistance and prevent backflow. The multi-stage diversion and reconvergence method improves the mixing tolerance, achieving good mixing even with slightly lower device manufacturing precision. This design can meet various mixing requirements, including liquid-liquid, liquid-gas, and liquid-liquid-gas mixing. Furthermore, the material enters the ultrasonic tank after multi-stage cross-mixing, further homogenizing the material, dispersing microbubbles, and making pollutants more hydrophilic. By dividing the water distribution baffle into multiple zones based on cross-sectional pressure, each zone corresponding to a different orifice diameter, the flow rate in each zone tends to be consistent, significantly improving the water distribution effect. Semi-circular orifices are arranged at the outermost contact point between the baffle and the reactor wall, effectively increasing the material velocity near the wall and balancing the flow field distribution. In addition, the bottom of the baffle is equipped with an elliptical opening, which can completely drain the reaction water and reduce the direct impact between different batches of experiments.

[0031] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A photocatalytic wastewater treatment device, characterized in that, include: It consists of a multi-section cross-flow mixing pipe, an ultrasonic tank, and a photocatalytic reactor, wherein the photocatalytic reactor consists of a tubular reactor equipped with ultraviolet lamps and baffles embedded inside the tubular reactor. The cross-flow mixing pipes are arranged in a tree-like pattern. The cross-flow mixing pipes include an inlet main pipe, branch pipes, and an outlet main pipe. Wastewater enters through the inlet main pipe, is diverted through multiple stages, enters the branch pipes, and the material in the branch pipes is then converged through multiple stages to enter the outlet main pipe and then enters the adjacent cross-flow mixing pipes.

2. The photocatalytic wastewater treatment device as described in claim 1, characterized in that: in, Each branch pipe converging point is equipped with a side channel, which is used to reduce water flow resistance and prevent backflow after the water flows converge; The angle between the two branches at the confluence point is 15-45 degrees.

3. The photocatalytic wastewater treatment device as described in claim 1, characterized in that: The first cross-flow mixing pipeline has two inlet pipes at the inlet. One inlet pipe is equipped with a venturi tube and is used for liquid-gas mixing, while the other inlet pipe is equipped with a pipeline mixer for liquid-liquid mixing.

4. The photocatalytic wastewater treatment device as described in claim 1, characterized in that: in, The ultrasonic tank is a closed water tank with ultrasonic rods arranged inside. The front end of the ultrasonic tank is connected to a cross-flow mixing pipe, and the rear end is connected to a photocatalytic reactor.

5. The photocatalytic wastewater treatment device as described in claim 1, characterized in that: The photocatalytic reactor is a tubular reactor with water entering from one side and exiting from the other side. A water distribution baffle is arranged at the water inlet end and an outlet baffle is arranged at the water outlet end.

6. The photocatalytic wastewater treatment device as described in claim 5, characterized in that: in, The opening areas of the water distribution baffle and the water outlet baffle are divided into 4 regions according to the change of cross-sectional pressure. The regions are named as the first region, the second region, the third region, and the fourth region respectively, from low to high pressure. The openings in each region correspond to different diameters. The aperture of the first region is between the minimum and maximum diameters, the second region is the minimum diameter aperture, the third region is the maximum diameter aperture, and the fourth region is a fully open region.

7. The photocatalytic wastewater treatment device as described in claim 5, characterized in that: The first zone is from the bottom of the baffle to 1 / 4-1 / 5 of its height; the second zone is from 1 / 4-1 / 5 of its height to 3 / 5-3 / 4 of its height; the third zone is from 3 / 5-3 / 4 of its height to 4 / 5-3.5 / 4 of its height; and the fourth zone is from 4 / 5-3.5 / 4 of its height to the top.

8. The photocatalytic wastewater treatment device as described in claim 7, characterized in that: in, The water distribution baffle and the water outlet baffle are connected to the tubular reactor with semi-circular openings, the diameter of which is consistent with the area to which they belong. Among them, the bottom of the water distribution baffle and the water outlet baffle has an elliptical opening, the opening height is 1%-2.5% of the total height of the water outlet baffle, and the opening width is 2-5 times the opening height; The total open area of ​​the water distribution baffle is 2%-10% of the total baffle area, and the total open area of ​​the water outlet baffle is 5%-20% of the total baffle area.

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