Photocatalytic oxidation advanced treatment device and method of using same

Abstract

To provide an apparatus for advanced photocatalytic oxidation treatment and a method for using the same.SOLUTION: There are provided an apparatus and a method of use for advanced photocatalytic oxidation treatment including a shell, a water inlet pipe and a water outlet pipe, in which a light source in the upper half is installed in the inner wall of the shell, a photocatalytic turntable component is rotatably mounted within the shell, the photocatalytic turntable component includes a support made of transparent material, a spiral groove is formed in the support, a photocatalytic membrane is fixed to both sides of the support via brackets, incoming water in the water inlet pipe enters the spiral groove by the rotating action of the support and evenly distributed inside the photocatalytic membrane through centrifugal force to conduct photocatalytic oxidation reaction, the photocatalytic oxidation reaction is carried out by the catalytic turntable component, and new pollutants and other hard-to-decompose organic matter in sewage can be effectively decomposed, resulting in high-quality effluent and improving the safety of the discharged water.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an apparatus for advanced photocatalytic oxidation treatment and a method for using the same, and belongs to the field of environmental engineering. [Background technology]

[0002] Photocatalysis is a green technology with important applications in the energy and environmental fields. It was first discovered by Fujiwara in 1972, and Bard proposed to use semiconductor photocatalysis to treat harmful substances in industrial wastewater in 1977. Photocatalysis mainly involves absorbing energy higher than the forbidden band through semiconductor photocatalysts, after which electrons are excited to form holes, generating active free radicals, and then these free radicals attack the target pollutants, thereby achieving the purpose of catalytic decomposition. A large number of research reports at home and abroad have shown that photocatalytic oxidation method has good removal effect on halogenated hydrocarbons, carboxylic acids, surfactants, dyes, nitrogen-containing organic matter, organophosphorus pesticides, etc. in water, and even organic pollutants that are usually difficult to decompose can generally reach complete mineralization after continuous reaction. The photocatalysis process uses semiconductor materials as photocatalysts, which is carried out under normal temperature and pressure, and when sunlight is used as the light source, it can greatly reduce the cost of wastewater treatment. More importantly, photocatalysis technology can decompose pollutants into non-toxic inorganic small molecules and various corresponding inorganic ions to achieve detoxification, providing a new potential method for the treatment of water pollution.

[0003] The turntable described in Patent Document 1 performs photocatalytic oxidation reaction by directly loading photocatalyst and placing a glass sheet between two turntables. This method can improve the light utilization rate, but it is very limited, and the direct loading of photocatalyst on the turntable increases the operating cost of the device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese patent with publication number CN105330071A Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE PRESENT EMBODIMENT The present invention aims to provide an apparatus for photocatalytic oxidation advanced treatment and a method for using the same, in order to overcome the shortcomings and deficiencies of the prior art. [Means for solving the problem]

[0006] An apparatus for photocatalytic oxidation advanced treatment including a shell, an inlet pipe and an outlet pipe, The upper half of for ,light A source is installed, and a photocatalytic turntable component is rotatably mounted within the shell, and the photocatalytic turntable component is made of a transparent material. Cylindrical A support is provided with a spiral groove, Cylindrical Support Two bottom A photocatalytic membrane is fixed to the side of the water inlet pipe via a bracket, and the inflow water in the water inlet pipe is From a water inlet provided at the center of the support, By the rotational movement of the support The above Entering the spiral groove, through centrifugal force The spiral groove; Photocatalytic film The space formed by the surface The photocatalytic oxidation reaction is carried out through the photocatalytic turntable component, which can effectively decompose difficult-to-decompose organic matter such as new pollutants in sewage, thereby obtaining high-quality effluent water and improving the safety of the effluent water. In addition, the device uses green energy, does not produce secondary pollution, has good reusability of the photocatalytic membrane, and reduces the operating costs of the device.

[0007] Preferably, the light source is disposed in the upper half of the shell, a reflector is provided on the inner wall thereof, and the lower half is a water tank. be .

[0008] Furthermore, the light source is a xenon lamp using a cold light source, and an air-cooling device is arranged on the light source, and the light source is located on the inner wall around the upper half of the shell, and the light source is arranged on the inner wall around the upper half of the entire device shell to provide energy for the photocatalytic oxidation reaction.

[0009] Preferably, the material of the support is quartz, glass. S It is a transparent material ,before A discharge water outlet is installed on the edge of the support, and the support is connected to the shell via a rotating bearing and rotates counterclockwise. When the water flow is uniformly distributed inside the photocatalytic membrane by centrifugal force, the support is made of a transparent material, so that light can be transmitted to the inside of the photocatalytic membrane without losing light energy, thereby improving the light utilization efficiency.

[0010] Furthermore, the rotary bearing is a lower half of the shell. Apical center To the point It is fixed and detachably connected to the shell, and is fixed between the rotating bearing and the support via a fastener, and the fixing method is simple and quick to attach and detach, and the support can rotate smoothly within the shell.

[0011] Preferably, the bracket is divided into a positive part and a negative part, which have the same structure, and the bracket is adapted to fix the photocatalytic film. The cylindrical Support Two bottom surfaces and connected and fixed between the two parts of the bracket with a fastener, the fastener being detachably connected so that the photocatalytic film can be easily replaced.

[0012] Preferably, the photocatalyst in the photocatalyst film adopts modified graphite phase carbon nitride, and the photocatalyst film is hydrophilic, has good water permeability, and has good decomposition performance under visible light.

[0013] Furthermore, the inlet pipe is located at the top of the lower half of the shell and is connected to a valve and a peristaltic pump externally, the outlet pipe is located at the bottom of the lower half of the shell and is connected to a valve externally, and the outlet pipe and the inlet pipe are located at both ends of the shell, respectively.

[0014] Preferably, the material of the shell is stainless steel, plastic, glass fiber reinforced plastic. K It is composed of one or more of the following materials:

[0015] The present invention further provides a method for using the apparatus suitable for wastewater treatment, which is used for treatment. When the apparatus is operated, the photocatalytic membrane is first fixed to the surface of the support by the bracket, and then the wastewater is introduced into the water storage tank through the inlet pipe, the valve and the peristaltic pump, and 1 / 2 of the photocatalytic membrane is immersed in the water; Infiltrated photocatalyst The membrane is called the infiltration area, and the other part is the exposed area. The rotary bearing drives the rotation of the support when it starts to work. When the support rotates, the photocatalytic membrane on its surface adsorbs the wastewater in the water tank, and brings the wastewater from the infiltration area to the exposed area and performs photocatalytic oxidation reaction by irradiation with a light source. At the same time, there is a water inlet in the center of the support, which is connected to the water tank. The tail water in the water tank flows from the water inlet to the support. A spiral groove on the surface of a support created by a rotating motion As well as entering Applicable The spiral grooves and the centrifugal force generated when the turntable rotates push the tail water The spiral groove; photocatalytic membrane The surface of the After one reaction cycle is completed, the water is discharged from the outlet and the second cycle begins. Effect of the Invention

[0016] The beneficial effects of the present invention are as follows: by installing the photocatalytic turntable component, the photocatalytic film and the wastewater adsorbed on its surface can be periodically exposed to air, and the high light transmittance of air effectively improves the removal efficiency, and the suspended matter in the wastewater and the absorption loss of chromaticity to light can be avoided; the spiral groove installed in the support cleverly utilizes centrifugal force, and effectively improves the mass transfer efficiency of the wastewater; and the support in the photocatalytic turntable component is made of a transparent material, so that it can effectively transmit light, avoid loss, and improve purification efficiency. [Brief description of the drawings]

[0017] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the drawings necessary to be used in the description of the embodiments or the prior art will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present invention, and other drawings obtained from these drawings without creative efforts by those skilled in the art still belong to the scope of the present invention.

[0018] [Figure 1] FIG. 2 is a structural schematic diagram of the main body of the present invention; [Diagram 2] FIG. 2 is a structural schematic diagram of the photocatalytic turntable component in the present invention. [Diagram 3] FIG. 2 is a structural schematic diagram of a support member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings.

[0020] In addition, in the embodiments of the present invention, the expressions "first" and "second" are used to distinguish between two entities or parameters that are not the same but have the same name, and "first" and "second" are used only for convenience of expression, and should not be understood as limitations on the embodiments of the present invention, and the following embodiments will not describe them one by one.

[0021] The direction and position terms mentioned in the present invention, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "top", "bottom", "side", etc., are only directions or positions referring to the drawings. Therefore, the direction and position terms used are used to explain and understand the present invention, and are not limitations on the protection scope of the present invention.

[0022] As shown in Figures 1-3, this is an embodiment of the photocatalytic oxidation advanced treatment device of the present invention, which includes a shell 3, a water inlet pipe 1 and a water outlet pipe 2. The inner wall of the shell 3 is provided with a light source 4 in the upper half. A photocatalytic turntable component 5 is rotated and mounted inside the shell 3. The photocatalytic turntable component 5 includes a support 8 made of a transparent material, a spiral groove 11 is provided on the support 8, and a photocatalytic membrane 6 is fixed on both sides of the support 8 through a bracket 9. The inflow water in the water inlet pipe 1 enters the spiral groove 11 through the rotation of the support 8, and is uniformly distributed inside the photocatalytic membrane 6 through centrifugal force to carry out photocatalytic oxidation reaction. The photocatalytic turntable component 5 carries out photocatalytic oxidation reaction, which can effectively decompose the organic matter that is difficult to decompose, such as new pollutants in sewage, to obtain high-quality effluent water and improve the safety of the effluent water. In addition, the device uses green energy, does not generate secondary pollution, has good reusability of the photocatalytic membrane 6, and reduces the operating cost of the device.

[0023] A light source 4 is arranged in the upper half of the shell 3, a reflector is installed on its inner wall, and the lower half is a water tank 13, and a water-blocking layer is installed between the water tank 13 and the shell 3. The light source 4 is a xenon lamp using a cold light source 4, and an air-cooling device is arranged on the light source 4, and the light source 4 is arranged on the inner wall around the upper half of the shell 3, and the light source 4 is arranged on the inner wall around the upper half of the entire device shell 3, providing energy for the photocatalytic oxidation reaction.

[0024] The material of the support 8 is a transparent material such as quartz, glass, etc., and a water inlet 10 is provided at the center of the support 8, and a water outlet 12 is provided at the edge of the support 8. The support 8 is connected to the shell 3 through the rotary bearing 7 and rotates counterclockwise. When the water flow is uniformly distributed inside the photocatalytic film 6 through the centrifugal force, the support 8 is made of a transparent material, so that the light energy is not lost and the light is passed to the inside of the photocatalytic film 6 to perform a photocatalytic oxidation reaction, thereby improving the light utilization efficiency. The rotary bearing 7 is fixed to the apex of the center point of the lower half of the shell 3 and is detachably connected to the shell 3. The rotary bearing 7 is fixed between the rotary bearing 7 and the support 8 through a fastener, and the fixing method is simple and quick to attach and detach, and the support 8 can be smoothly rotated inside the shell 3.

[0025] The bracket 9 is divided into a positive part and a negative part, which have two identical structures, and the bracket 9 is disposed on the front and back sides of the support 8, respectively, to fix the photocatalytic membrane 6, and the two parts of the bracket 9 are connected and fixed by means of fasteners, which are detachably connected, and the photocatalytic membrane 6 can be easily replaced. The photocatalyst in the photocatalytic membrane 6 adopts modified graphite phase carbon nitride, and the photocatalytic membrane 6 is hydrophilic, has good water permeability, and has good decomposition performance under visible light.

[0026] The inlet pipe 1 is located at the top of the lower half of the shell 3 and is connected to a valve and a peristaltic pump externally, and the outlet pipe 2 is located at the bottom of the lower half of the shell 3 and is connected to a valve externally, and the outlet pipe 2 and the inlet pipe 1 are located at both ends of the shell 3, respectively.

[0027] The material of the shell 3 is one or more of stainless steel, plastic, glass fiber reinforced plastic, and the like.

[0028] The present invention further provides a method for using the apparatus suitable for wastewater treatment, the apparatus being used for treatment, the shell 3 having a size of 30cm*20cm*30cm and a volume of 18000cm 3 The stainless steel shell is selected as the

[0029] The light source 4 is a 200W cold-source xenon lamp.

[0030] The support 8 is made of quartz, has a thickness of 4 cm, a diameter of 20 cm, has spiral grooves 11 of width 1 cm and depth 1 cm distributed on its surface, and has a water inlet 10 of diameter 2.5 cm in the center of the support 8. The diameter of the photocatalyst film 6 is 20 cm.

[0031] The rotating bearing 7 is 20 cm long, the bracket 9 is made of stainless steel and is used to fix the photocatalytic film 6, its diameter is 20 cm, the diameter of the bracket 9 is 3 mm, and both have 6 stainless steel bars.

[0032] The water tank 13 is located in the lower half of the stainless steel shell 3, and a single layer of water impermeable layer is installed between the stainless steel shell 3 and the water tank 13. The size of the water tank 13 is 30cm x 20cm x 15cm, and the volume is 9000cm. 3 It is.

[0033] The device adopts photocatalytic oxidation to oxidize and decompose new pollutants in the tailwater. The stainless steel shell 3 is equipped with a water inlet pipe 1 and a water outlet pipe 2. The water flow is intermittent, that is, when water flows into the water inlet pipe 1, the water outlet pipe 2 is in a closed state. When the water level in the water storage tank 13 reaches 1 / 2 of the photocatalytic turntable component 5, the water inflow is stopped to carry out the photocatalytic oxidation reaction. After one reaction cycle is completed, the water outlet pipe 2 is opened to remove the water and carry out the next reaction cycle. The water inlet pipe 1 is located at the top of the water storage tank 13, and the water outlet pipe 2 is located at the bottom of the water storage tank 13. Both of them are equipped with valves to control the water flow. At the same time, a peristaltic pump is also installed in the water inlet pipe 1 to be used for water inflow. The rotary bearing 7 is connected to an external motor to provide power. The rotation of the photocatalytic turntable component 5 is driven by the rotary bearing 7. The water level in the water storage tank 13 is stopped by the photocatalytic turntable component 5. The photocatalytic turntable component 5 is rotated counterclockwise along the rotary bearing 7, and the rotating speed is determined according to the specific water quality conditions. When the photocatalytic turntable component 5 rotates, the tail water flows from the water inlet 10 into the groove 11, and then flows uniformly into the contact surface of the photocatalytic membrane 6 and the support 8 under the action of centrifugal force. The photocatalytic membrane 6 adsorbs the tail water in the water storage tank 13, and a layer of thin liquid film is left on the surface of the membrane. This layer of thin liquid film can carry out rapid photocatalytic oxidation reaction under the irradiation of the light source 4. The photocatalytic membrane 6 can be replaced independently as an independent part, which reduces the operation and management costs. At the same time, according to the different decomposition performance of the photocatalytic membrane 6, the whole device can be used in different actual scenarios, and the tail water can effectively decompose the concentration of new pollutants after passing through the above process.

[0034] In the system using the above-mentioned device of the present invention, the effluent reaches the first level B discharge standard specified in the "Pollutant Discharge Standards for Municipal Sewage Treatment Plants" (GB18918-2002), the tonnage operation costs are lower than those of general sewage treatment processes, the operation and management are simple, and the number of disease bacteria in the effluent is lower than the detection limit and meets the reuse standard.

[0035] The above disclosure is only the preferred embodiment of the present invention, and of course the scope of the claims of the present invention cannot be limited thereby, and therefore equivalent modifications according to the claims of the present invention also belong to the scope of the present invention.

[0036] While the present invention has been described with reference to certain specific embodiments, it is to be understood that the invention is not limited to the specific embodiments disclosed, and the invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. [Explanation of symbols]

[0037] 1. Water inlet pipe 2, Outlet pipe 3. Shell 4, light source 5. Photocatalytic turntable components 6, Photocatalytic membrane 7. Rotary bearing 8, support 9. Bracket 10. Water inlet 11, groove 12, water outlet 13. Water tank

Claims

1. A photocatalytic oxidation advanced treatment device comprising a shell, a water inlet pipe and a water outlet pipe, a light source is installed in the upper half of the inner wall of the shell, a photocatalytic turntable component is rotated and attached inside the shell, the photocatalytic turntable component includes a cylindrical support made of a transparent material, a spiral groove is installed in the support, a photocatalytic membrane is fixed to the two bottom sides of the cylindrical support via brackets, inflow water in the water inlet pipe enters the spiral groove from a water inlet provided in the center of the support by the rotation of the support, and is uniformly distributed in the space formed by the spiral groove and the surface of the photocatalytic membrane through centrifugal force, thereby carrying out a photocatalytic oxidation reaction.

2. 2. The photocatalytic oxidation advanced treatment device according to claim 1, wherein a light source is disposed in the upper half of the shell, a reflector is installed on the inner wall thereof, and the lower half is a water storage tank.

3. The photocatalytic oxidation advanced treatment device according to claim 2, characterized in that the light source uses a cold light source xenon lamp, and an air cooling device is arranged around the light source, and the light source is located on the inner wall around the upper half of the shell.

4. The photocatalytic oxidation advanced treatment device according to claim 1, characterized in that the material of the support is a transparent material such as quartz or glass, a water outlet is installed at the edge of the support, and the support is connected to the shell via a rotating bearing to rotate counterclockwise.

5. The photocatalytic oxidation advanced treatment device as described in claim 4, characterized in that the rotating bearing is fixed to the center point of the top end of the lower half of the shell, detachably connected to the shell, and fixed between the rotating bearing and the support via a fastener.

6. The photocatalytic oxidation advanced treatment device described in claim 1, characterized in that the bracket is divided into a front and a back part having two identical structures, the bracket is respectively arranged on the two bottom surfaces of the cylindrical support to fix the photocatalytic membrane, and the two parts of the bracket are connected and fixed with fasteners between them.

7. 7. The photocatalytic oxidation advanced treatment device according to claim 6, wherein the photocatalyst in the photocatalytic membrane is modified graphite phase carbon nitride.

8. The photocatalytic oxidation advanced treatment device as described in claim 1, characterized in that the inlet pipe is located at the top of the lower half of the shell and connected to a valve and a peristaltic pump externally, the outlet pipe is located at the bottom of the lower half of the shell and connected to a valve externally, and the outlet pipe and the inlet pipe are respectively located at both ends of the shell.

9. 2. The photocatalytic oxidation advanced treatment device according to claim 1, wherein the material of the shell is one or more of stainless steel, plastic, and glass fiber reinforced plastic.

10. When the device according to any one of claims 1 to 9 is used for treatment and operation, first, the photocatalytic film is fixed to the surface of the support via a bracket, and then the wastewater enters the water tank from the water inlet pipe through the valve and the peristaltic pump, and half of the photocatalytic film is infiltrated into the water, and the infiltrated photocatalytic film is called the infiltration area, and the other part becomes the exposed area. The rotary bearing drives the rotation of the support when it starts to operate, and when the support rotates, the photocatalytic film on its surface adsorbs the wastewater in the water tank, and the wastewater is brought from the infiltration area to the exposed area, where it undergoes photocatalytic oxidation reaction by irradiation with a light source. and at the same time, a water inlet is provided in the center of the support, which is connected to a water storage tank, and the tail water in the water storage tank enters the spiral groove on the surface of the support through the rotation of the support, and the tail water is uniformly distributed in the space formed by the spiral groove and the surface of the photocatalytic film by the centrifugal force generated when the spiral groove and the turntable rotate, thereby carrying out a photocatalytic oxidation reaction, and finally, after one reaction cycle is completed, the water flow is discharged from the water outlet, and a second cycle is started.

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