CN107200376B - Turntable photocatalyst wastewater treatment device and method - Google Patents
Turntable photocatalyst wastewater treatment device and method Download PDFInfo
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- CN107200376B CN107200376B CN201710483590.1A CN201710483590A CN107200376B CN 107200376 B CN107200376 B CN 107200376B CN 201710483590 A CN201710483590 A CN 201710483590A CN 107200376 B CN107200376 B CN 107200376B
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The invention provides a turntable photocatalyst wastewater treatment device and a method, the device comprises a rotating motor and the like, wherein the rotating motor is connected with one end of a metal conductive rotating shaft, the other end of the metal conductive rotating shaft is provided with a fixed surface, and a circular conductive base photoanode turntable is attached to the fixed surface and is vertically connected with the metal conductive rotating shaft; the circular conductive base photo-anode turntable is wholly and horizontally immersed in wastewater to be treated in the wastewater reaction tank and is close to a quartz glass light-transmitting window which is arranged in parallel to the plane of the circular conductive base photo-anode turntable, and the ultraviolet irradiation light source is right opposite to the quartz glass light-transmitting window; and a conductive counter electrode is arranged on the outer side of the circular conductive base photo-anode turntable. The invention provides mechanical tangential speed by utilizing the rotation of the circular conductive base photo-anode turntable, enhances mass transfer and improves reaction efficiency.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a turntable photocatalyst wastewater treatment device and method.
Background
The industrial wastewater discharge reaching the standard is increasingly strict, the first-class B standard in GB18918-2002 is implemented in part of regions, the COD discharge index is only 60mg/L, and higher requirements are objectively put forward for the wastewater treatment technology. In the common industrial wastewater COD treatment method, coagulating sedimentation and ion exchange are auxiliary methods; the activated carbon adsorption is only used for end treatment, the treatment cost is very high, and the activated carbon is required to be regenerated after being adsorbed and saturated; the aerobic and anaerobic biochemical methods need to adjust the water quality in advance, so that the pH and COD load are suitable for microbial treatment, and most industrial wastewater, especially refractory industrial wastewater, cannot be treated to the required discharge index; the membrane separation process cannot effectively treat concentrated water. Therefore, advanced oxidation wastewater advanced treatment method for directly and completely mineralizing COD needs to be developed to meet the requirement of low COD treatment.
The existing mineralized COD advanced oxidation methods such as a Fenton reagent method and a supercritical oxidation method have own advantages and disadvantages, for example, the Fenton method needs to continuously add H2O2The supercritical method has high treatment cost and high equipment requirement, and the photocatalysis is carried outThe wastewater treatment technology can effectively react in acidic and alkaline wastewater media without adding chemical agents, can generate electric energy output by itself under the ultraviolet irradiation condition, converts chemical energy in pollutants in wastewater into electric energy for recycling, and theoretically has better economical efficiency. Such photocatalytic reactors capable of simultaneously generating electricity and degrading wastewater are collectively referred to as photocatalytic fuel cell reactors (PFCs). Different from photocatalytic wastewater treatment with powder as a photocatalyst, the photocatalytic fuel cell reactor needs to recover electric energy, and the photocatalyst needs to be loaded on a conductor so as to lead out electrons generated by photocatalytic reaction and supply power to the outside. Therefore, the photocatalyst must be supported to form a photocatalytic electrode (also called a photocatalytic anode). With TiO2The semiconductor photocatalyst is solid, pollutants in the wastewater are dispersed in the wastewater solution, and the pollutants need to diffuse to the surface of the solid electrode to be subjected to interface reaction with the excited holes on the photocatalyst, so that the semiconductor photocatalyst has the characteristic of typical interface reaction. When low-concentration COD wastewater is taken as a treatment object, the mass transfer resistance is a speed limiting step, so that one of the main difficulties which need to be overcome by how to overcome the mass transfer resistance in the wastewater treatment design of the photocatalytic fuel cell reactor.
The inclined plate reactor plays a role in reducing mass transfer resistance. However, the inclined plate reactor relies only on gravity flow for cutting, and the reaction rate is increased only to a limited extent. The existing photocatalytic rotary disc reactor is mainly used for reducing the light absorption loss of solution, and the mass transfer enhancement is also limited. For example, chinese patent No. CN102398955 proposes a double-turntable photoelectric liquid membrane reactor, in which wastewater degradation is performed by rotating a photo-anode turntable and a photo-cathode turntable simultaneously by a rotating shaft, half of the turntable is immersed in a solution, and a liquid film is formed on the surface by rotation, thereby reducing solution absorption and light reflection. And the liquid film rotates along with the rotating disc during the rotation of the rotating disc, so that the relative shear rate is avoided, the mass transfer enhancement is limited, and the improvement is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a turntable photocatalyst wastewater treatment device and a turntable photocatalyst wastewater treatment method.
According to one aspect of the invention, the invention provides a turntable photocatalyst wastewater treatment device which is characterized by comprising a rotary motor, a metal conductive rotating shaft, a circular conductive base photo-anode turntable, a conductive counter electrode, a wastewater reaction tank and an ultraviolet irradiation light source, wherein the rotary motor is connected with one end of the metal conductive rotating shaft, the other end of the metal conductive rotating shaft is provided with a fixed surface, and the circular conductive base photo-anode turntable is attached to the fixed surface and is vertically connected with the metal conductive rotating shaft; the circular conductive base photo-anode turntable is wholly and horizontally immersed in wastewater to be treated in the wastewater reaction tank and is close to a quartz glass light-transmitting window which is arranged in parallel to the plane of the circular conductive base photo-anode turntable, and the ultraviolet irradiation light source is right opposite to the quartz glass light-transmitting window; the outer side of the circular conductive base photo-anode turntable is provided with a conductive counter electrode, and the cross section central plane of the conductive counter electrode and the circular conductive base photo-anode turntable are on the same plane, namely are concentrically arranged with the circular conductive base photo-anode turntable electrode; a wastewater treatment slit area is formed among the circular conductive base photo-anode turntable, the conductive counter electrode and the quartz glass window; during operation, ultraviolet light of the ultraviolet irradiation light source is emitted from the quartz glass window and irradiates the surface of the circular conductive base photo-anode turntable, the circular conductive base photo-anode turntable is driven by the rotating motor to rotate, and wastewater enters from the bottom of the wastewater reaction tank and is discharged from the other side after passing through the wastewater treatment slit area.
Preferably, the circular conductive base photo-anode turntable synchronously irradiates and rotates in the wastewater to be treated, and the wastewater reacts with the interface of the high-speed rotating photo-catalytic electrode. Therefore, the waste water solution is cut in the process of high-speed rotation of the photo-anode turntable, pollutants are transferred to a photo-catalytic interface more quickly, and more free radicals are generated on the surface of a photocatalyst at two angles, so that mass transfer is enhanced simultaneously.
Preferably, the metal conductive rotating shaft is made of metal (including but not limited to copper, iron and aluminum), the fixed surface of the metal conductive rotating shaft is of a two-layer step structure, the width of the step at the bottom layer is larger than that of the step at the upper layer, the contact surface is attached to the circular conductive base photoanode turntable to play a role in fixing the circular conductive base photoanode turntable, the step at the upper layer is D-shaped and corresponds to a through hole of the circular conductive base photoanode turntable, and after the circular conductive base photoanode turntable is installed, the circular conductive base photoanode turntable cannot slide relative to the rotating shaft; and a concentric circular hole is drilled inwards at the center of the upper step, and internal threads are milled on the inner wall of the concentric circular hole and used for connecting a screw. Therefore, the photo-anode turntable can be fixed on the metal rotating shaft without relative sliding, and the turntable is ensured to be conductive.
Preferably, the circular conductive base photo-anode turntable is made of a metal conductive base material (including but not limited to titanium and stainless steel materials), the surface of the circular conductive base photo-anode turntable is circular, and a concentric through hole is reserved in the center of the circular conductive base photo-anode turntable and used for fixing the surface of the turntable; the side of the concentric through hole 3/4 is circular, the side 1/4 is linear, and the whole concentric through hole is D-shaped. Therefore, the photo-anode turntable can be fixed, and the turntable can not rotate relative to the metal rotating shaft.
Preferably, the conductive counter electrode is a circular copper ring with a rectangular cross section, the inner diameter of the conductive counter electrode is slightly larger than that of the circular conductive base photo-anode turntable, and the conductive counter electrode and the circular conductive base photo-anode turntable are concentrically arranged. Therefore, photoelectrons generated in the photocatalysis process can be transferred to the counter electrode, the recombination rate of the photoelectrons and photoproduction holes is reduced, and the catalysis efficiency is improved.
Preferably, the bottom of the wastewater reaction tank is provided with a water outlet and a water inlet. Therefore, the wastewater can enter from the bottom of the reaction tank through the water inlet and outlet and is discharged after passing through the treatment slit area between the turntable and the bottom of the reaction tank.
Preferably, a photocatalyst is arranged on one substrate of the circular conductive base photoanode turntable, and the photocatalyst is a visible light photocatalyst or an ultraviolet light photocatalyst. Therefore, the photocatalyst can be fixed, the catalyst is prevented from entering a water body, and the rotary disc can be directly recycled for secondary use.
The invention provides a turntable photocatalyst wastewater treatment method which is characterized by comprising the following steps:
firstly, uniformly preparing a layer of photocatalyst film on a cut circular conductive base photo-anode turntable by adopting a sol-gel or anodic oxidation or hydrothermal and solvothermal method, and cooling after sintering;
secondly, mounting and fixing the circular conductive base photoanode rotary table loaded with the photocatalyst on a metal conductive rotary shaft in the form of an O-shaped soft gasket, the circular conductive base photoanode rotary table and a screw;
thirdly, connecting the circular conductive base photo-anode turntable and the metal conductive rotating shaft with a rotating motor, and adjusting the height of the device to enable the circular conductive base photo-anode turntable to be horizontally arranged in a wastewater reaction tank;
fourthly, adding organic wastewater into the wastewater reaction tank, and respectively connecting the conductive counter electrode with the metal conductive rotating shaft through an external lead and a contact slide rail;
fifthly, turning on a rotating motor and a UV or visible light irradiation light source, adjusting the rotating speed through a speed regulator, keeping the circular conductive base photo-anode turntable rotating at a high speed under the irradiation condition, and cutting the wastewater solution;
and sixthly, opening an external circulating pump, feeding water from the water inlet, continuously treating the wastewater, and discharging the treated wastewater from the water outlet.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the invention provides mechanical tangential speed by utilizing the rotation of the circular conductive base photo-anode turntable, enhances mass transfer and improves reaction efficiency.
Secondly, the invention synchronously rotates under the irradiation condition, and enhances mass transfer from two angles of transferring pollutants to a photocatalysis interface and generating free radicals on the surface of a photocatalyst.
Thirdly, the invention can realize the efficient pollutant removal of the wastewater without using an external oxidant, and meets the wastewater discharge requirement.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of the structure of a turntable photocatalyst wastewater treatment device of the present invention.
FIG. 2 is a schematic structural diagram of the circular conductive base photo-anode turntable, the wastewater reaction tank and other elements in the invention.
Fig. 3 is a schematic structural diagram of elements such as a metal conductive rotating shaft.
Fig. 4 is a schematic structural diagram of the photoanode turntable.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1 to 4, the turntable photocatalyst wastewater treatment device of the present invention comprises a rotary motor 1, a metal conductive rotary shaft 10, a circular conductive base photo-anode turntable 3, a conductive counter electrode 4, a wastewater reaction tank 2, and an ultraviolet irradiation light source 7, wherein the rotary motor 1 is connected with one end of the metal conductive rotary shaft 10, the other end of the metal conductive rotary shaft is provided with a fixed surface, and the circular conductive base photo-anode turntable is attached to the fixed surface and is vertically connected with the metal conductive rotary shaft; the circular conductive base photo-anode turntable is wholly and horizontally immersed in wastewater to be treated in the wastewater reaction tank and is close to a quartz glass light-transmitting window 13 which is arranged in parallel with the plane of the circular conductive base photo-anode turntable, and the ultraviolet irradiation light source 7 is right opposite to the quartz glass light-transmitting window 13; the outer side of the circular conductive base photo-anode turntable is provided with a conductive counter electrode 4, and the cross section central plane of the conductive counter electrode and the circular conductive base photo-anode turntable are on the same plane, namely are concentrically arranged with the circular conductive base photo-anode turntable electrode; a wastewater treatment slit area is formed among the circular conductive base photo-anode turntable, the conductive counter electrode and the quartz glass window; during operation, ultraviolet light of the ultraviolet irradiation light source is emitted from the quartz glass window and irradiates the surface of the circular conductive base photo-anode turntable, the circular conductive base photo-anode turntable is driven by the rotating motor to rotate, and wastewater enters from the bottom of the wastewater reaction tank and is discharged from the other side after passing through the wastewater treatment slit area. The conductive counter electrode can be a copper ring counter electrode, so that the structure is simple and the cost is low.
The outer side of the ultraviolet radiation light source 7 is provided with an aluminum foil 8, so that reflection can be carried out, and the light source can be better utilized.
The bottom of the wastewater reaction tank is provided with a water outlet 5 and a water inlet 6 (the diameter is 2mm), and the wastewater reaction tank is used as a sampling port to take a water sample under a static condition. The bottom of the wastewater reaction tank is provided with quartz glass, and the ultraviolet irradiation light source can be two 11W ultraviolet lamps with the wavelength of 254nm and is arranged below the wastewater reaction tank.
A base of the round conductive base photo-anode turntable is provided with a photocatalyst 12, and the photocatalyst is a visible light photocatalyst or an ultraviolet light photocatalyst. A metal base conductive layer 11 is provided on the photocatalyst 12.
The circular conductive base photo-anode turntable is made of metal and has a circular disc surface. A concentric through hole 15 is reserved in the center of the rotary table and used for fixing the surface of the table. The aperture of the concentric through hole is 2-10 mm.
The conductive counter electrode is a circular copper ring with a rectangular cross section, the inner diameter of the conductive counter electrode is slightly larger than that of the circular turntable, and the conductive counter electrode and the optical anode turntable are concentrically arranged.
The stationary plane is two-layer stair structure, bottom stationary plane step broad, and the contact surface plays fixed circular electrically conductive base light anode carousel effect with the laminating of circular electrically conductive base light anode carousel, and the upper step is the D type, corresponds with the carousel through-hole, and after the carousel of packing into, the unable relative pivot of carousel slides. The center of the upper step is drilled with a concentric round hole 15, and the inner wall of the hole is milled with an internal thread for connecting a screw 14.
The turntable photocatalyst wastewater treatment method comprises the following steps:
firstly, uniformly preparing a layer of photocatalyst film on a cut circular conductive base photo-anode turntable by adopting a sol-gel or anodic oxidation or hydrothermal and solvothermal method, and cooling after sintering;
secondly, mounting and fixing the circular conductive base photoanode rotary table loaded with the photocatalyst on a metal conductive rotary shaft in the form of an O-shaped soft gasket, the circular conductive base photoanode rotary table and a screw;
thirdly, connecting the circular conductive base photo-anode turntable and the metal conductive rotating shaft with a rotating motor, and adjusting the height of the device to enable the circular conductive base photo-anode turntable to be horizontally arranged in a wastewater reaction tank;
fourthly, adding organic wastewater into the wastewater reaction tank, and respectively connecting the conductive counter electrode with the metal conductive rotating shaft through an external lead and a contact slide rail;
fifthly, turning on a rotating motor and a UV or visible light irradiation light source, adjusting the rotating speed through a speed regulator, keeping the circular conductive base photo-anode turntable rotating at a high speed under the irradiation condition, and cutting the wastewater solution;
sixthly, opening an external circulating pump under the dynamic condition, feeding water from a water inlet, continuously treating the wastewater, and discharging the treated wastewater from a water outlet; under the static condition, the water inlet is closed, the water outlet is sampled, the absorbance is measured again, and the chroma removal rate is calculated.
The circular conductive base photo-anode turntable is made of Ti serving as a base material, the diameter of the turntable is 20mm, the surface of the turntable is smooth, and a concentric central through hole is reserved in the middle of the turntable and used for fixing the turntable. The side of the through hole 3/4 is circular, and the aperture is 6 mm; 1/4 the side is linear and D-shaped as a whole. TiO is loaded on a photoanode turntable substrate by a sol-gel method and an anodic oxidation method2. The junction of the rotating shaft and the rotating disc is provided with a fixed surface which is two layers of steps, the bottom layer steps are wide, and the contact surface is attached to the rotating disc to play a role in fixing the rotating disc. The upper step is D-shaped, corresponds to the turntable through hole and penetrates through the turntable aperture after being installed. The central position of the step on the upper layer of the rotating shaft is concentrically milled with an internal thread with the diameter of 3mm and is used for connecting a screw. When the round conductive base photo-anode turntable is fixedly installed, the O-shaped soft gaskets 9 are installed on two surfaces of the round conductive base photo-anode turntable, then the round conductive base photo-anode turntable is installed on a fixing surface, and screws are screwed for fixing. After the fixing, the side-view turntable is 90 degrees with the rotating shaft, and the edge disturbance of the side-view turntable is not more than 5 degrees after the rotation. The height of the device is adjusted to enable the rotary table to be horizontally placed at the bottom of the reaction tank and close to the quartz glass window, and the distance between the rotary table and the quartz glass window is 3 mm. The counter electrode is a copper ring with the outer diameter of 30mm and the inner diameter of 25mm, is fixed at the bottom of the reaction tank, is concentrically installed with the photoanode turntable and does not rotate, and a through hole in the middle of the copper ring is an irradiation light source passage. The metal conductive rotating shaft and the copper ring counter electrode are connected with the rotating disk electrode through an external lead.
The metal conductive rotating shaft is fixedly provided with the circular conductive base photo-anode turntable, the rotating speed of the circular conductive base photo-anode turntable is adjusted to drive the photo-anode turntable to horizontally rotate and control the rotating speed, ultraviolet light emitted by the ultraviolet irradiation light source irradiates the surface of the photo-anode turntable from the lower part of the reaction tank, and the aluminum foil can be used for reflecting the ultraviolet light and improving the intensity of the ultraviolet light.
The application of photocatalyst rotary table deep treatment simulation dye wastewater with different rotating speeds. By adopting a turntable photocatalyst wastewater treatment device, as shown in figure 1, the treated object is 20mg/L rhodamine B (pH5.6,0.05mol/L Na)2SO4) The simulated wastewater has the equivalent COD concentration of 45.76mg/L and the wastewater volume of 10 mL. A titanium plate is used as a base of the photo-anode turntable, a disc with the diameter of 20mm is manufactured, and a concentric center through hole is reserved for fixing the turntable. The side of the through hole 3/4 is circular, and the aperture is 6 mm; 1/4 the edge is linear and the whole is D-shaped, and TiO is loaded on the substrate by a sol-gel method2And then the conductive rotating shaft is installed and fixed in the forms of an O-shaped gasket, a rotating disc, an O-shaped gasket and a 3mm screw. A copper ring with the outer diameter of 30mm and the inner diameter of 25mm is used as a counter electrode, and the copper ring is connected with a metal conductive rotating shaft and the counter electrode of the rotating disk electrode through an additional lead. Adding simulated wastewater into the reaction tank, adjusting the height of the device to ensure that the light anode turntable is completely immersed in the simulated wastewater, and placing the light anode turntable at the bottom of the reaction tank close to the quartz glass, wherein the distance between the light anode turntable and the quartz glass window is 3 mm. The copper ring counter electrode is placed at the bottom of the reaction tank and concentrically installed with the photo-anode turntable, a water outlet and a water inlet with the diameter of 2mm are arranged at the bottom of the reaction tank, the water inlet is closed under the static condition, and the water outlet is used as a sampling port. And starting the rotating disc electrode to enable the rotating disc to rotate horizontally, and adjusting the rotating speed to be 0rpm, 200 rpm, 400 rpm, 800 rpm and 1600rpm respectively. Two ultraviolet lamps with power of 11W and wavelength of 254nm are used as irradiation light sources to irradiate from the bottom of the reaction tank, so that the ultraviolet light penetrates through the quartz glass and the solution layer and irradiates to the surface of the photo-anode turntable. After 60min, a sample was taken and analyzed, and the absorbance at 563nm of the sample was measured to determine the degree of color removal (%). The results of the measurements of the invention at different rotational speeds are given in table 1 below:
TABLE 1
From the above results, it can be seen that the higher the rotation speed, the better the treatment effect.
A turntable photocatalyst wastewater treatment method with different reaction times. As shown in FIG. 1, 20mg/L rhodamine B (pH5.6,0.05mol/L Na) was used as a treatment target2SO4) The simulated wastewater has the equivalent COD concentration of 45.76mg/L and the wastewater volume of 10 mL. Adopting a titanium plate as a photo-anode turntable substrate, and adopting a sol-gel method to remove TiO2Loaded on the photoanode turntable substrate. The rotation speed of the rotating disk electrode was adjusted to 1600 rpm. The samples were sampled at 10, 20, 30, 40, 50 and 60min, and the absorbance was measured at 563nm to determine the degree of color removal (%) as shown in the following Table 2:
TABLE 2
| Time (min) | 10 | 20 | 30 | 40 | 50 | 60 |
| Chroma removal ratio (%) | 17.42 | 36.54 | 50.44 | 61.59 | 70.03 | 76.29 |
| Equivalent COD concentration (mg/L) | 37.79 | 29.04 | 22.68 | 17.58 | 13.71 | 10.85 |
From the above results, it can be seen that the treatment effect is improved as the reaction time is prolonged, and the treatment effect is better as the reaction time is prolonged.
A turntable photocatalyst wastewater treatment method with different membrane preparation modes. As shown in FIG. 1, 20mg/L rhodamine B (pH5.6,0.05mol/L Na) was used as a treatment target2SO4) The simulated wastewater has the equivalent COD concentration of 45.76mg/L and the wastewater volume of 10 mL. Adopting a titanium plate as a substrate of a photo-anode turntable, and respectively adopting four film-making methods of a sol-gel method, a sulfuric acid anodic oxidation method, a water phase anodic oxidation method and an organic phase anodic oxidation method to make TiO into a film2Loaded on the photoanode turntable substrate. The rotation speed of the rotary disk electrode was adjusted to 1600rpm, sampling was performed at 60min, and the absorbance was measured at a wavelength of 563nm to determine the degree of color removal (%). The results are given in table 3 below:
TABLE 3
From the above results, it can be seen that the film formation method has a good treatment effect, and the treatment effect by the aqueous phase anodic oxidation method is the best.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
1. A turntable photocatalyst wastewater treatment device is characterized by comprising a rotary motor, a metal conductive rotating shaft, a circular conductive base photo-anode turntable, a conductive counter electrode, a wastewater reaction tank and an ultraviolet irradiation light source, wherein the rotary motor is connected with one end of the metal conductive rotating shaft, the other end of the metal conductive rotating shaft is provided with a fixed surface, and the circular conductive base photo-anode turntable is attached to the fixed surface and is vertically connected with the metal conductive rotating shaft; the circular conductive base photo-anode turntable is wholly and horizontally immersed in wastewater to be treated in the wastewater reaction tank and is close to a quartz glass light-transmitting window which is arranged in parallel to the plane of the circular conductive base photo-anode turntable, and the ultraviolet irradiation light source is right opposite to the quartz glass light-transmitting window; the outer side of the circular conductive base photo-anode turntable is provided with a conductive counter electrode, and the cross section central plane of the conductive counter electrode and the circular conductive base photo-anode turntable are on the same plane, namely are concentrically arranged with the circular conductive base photo-anode turntable electrode; a wastewater treatment slit area is formed among the circular conductive base photo-anode turntable, the conductive counter electrode and the quartz glass light-transmitting window; during operation, ultraviolet light of an ultraviolet irradiation light source is emitted from the quartz glass light-transmitting window and irradiates the surface of the circular conductive base photo-anode turntable, the circular conductive base photo-anode turntable is driven by the rotating motor to rotate, and wastewater enters from the bottom of the wastewater reaction tank and is discharged from the other side after passing through the wastewater treatment slit area.
2. The rotary table photocatalyst wastewater treatment device as claimed in claim 1, wherein the circular conductive base photoanode rotary table is irradiated synchronously in the wastewater to be treated and rotated synchronously, and the wastewater is reacted with the circular conductive base photoanode rotary table interface rotating at high speed.
3. The turntable photo-catalytic wastewater treatment device according to claim 1, wherein the metal conductive rotating shaft is made of metal, the fixing surface of the metal conductive rotating shaft is a two-layer step structure, the width of the bottom step is larger than that of the upper step, the contact surface is attached to the circular conductive base photo-anode turntable to fix the circular conductive base photo-anode turntable, the upper step is D-shaped and corresponds to the through hole of the circular conductive base photo-anode turntable, and the circular conductive base photo-anode turntable cannot slide relative to the rotating shaft after being installed in the circular conductive base photo-anode turntable; and a concentric circular hole is drilled inwards at the center of the upper step, and internal threads are milled on the inner wall of the concentric circular hole and used for connecting a screw.
4. The turntable photocatalyst wastewater treatment device according to claim 1, wherein the circular conductive base photoanode turntable is made of a metal conductive base material, the surface of the circular conductive base photoanode turntable is circular, and a concentric through hole is reserved in the center of the circular conductive base photoanode turntable and used for fixing the surface of the turntable; the side of the concentric through hole 3/4 is circular, the side 1/4 is linear, and the whole concentric through hole is D-shaped.
5. The turntable photocatalyst wastewater treatment device according to claim 1, wherein the conductive counter electrode is a circular copper ring with a rectangular cross section, has an inner diameter slightly larger than that of the circular conductive base photo-anode turntable, and is concentrically mounted with the circular conductive base photo-anode turntable.
6. The turntable photocatalyst wastewater treatment device according to claim 1, wherein the wastewater reaction tank has a water outlet and a water inlet at the bottom.
7. The turntable photocatalyst wastewater treatment device as claimed in claim 1, wherein a photocatalyst is disposed on a substrate of the circular conductive-based photoanode turntable, and the photocatalyst is a visible light photocatalyst or an ultraviolet photocatalyst.
8. The turntable photocatalyst wastewater treatment device as claimed in claim 1, wherein an aluminum foil is disposed outside the ultraviolet irradiation light source.
9. A wastewater treatment method using the turntable photocatalyst wastewater treatment apparatus as defined in claims 1 to 8, comprising:
firstly, uniformly preparing a layer of photocatalyst film on a cut circular conductive base photo-anode turntable by adopting a sol-gel or anodic oxidation or hydrothermal and solvothermal method, and cooling after sintering;
secondly, mounting and fixing the circular conductive base photoanode rotary table loaded with the photocatalyst on a metal conductive rotary shaft in the form of an O-shaped soft gasket, the circular conductive base photoanode rotary table and a screw;
thirdly, connecting the circular conductive base photo-anode turntable and the metal conductive rotating shaft with a rotating motor, and adjusting the height of the device to enable the circular conductive base photo-anode turntable to be horizontally arranged in the wastewater reaction tank;
fourthly, adding organic wastewater into the wastewater reaction tank, and respectively connecting the conductive counter electrode with the metal conductive rotating shaft through an external lead and a contact slide rail;
fifthly, turning on a rotating motor and an ultraviolet irradiation light source, adjusting the rotating speed through a speed regulator, keeping the circular conductive base photo-anode turntable rotating at a high speed under the irradiation condition, and cutting the wastewater solution;
and sixthly, opening an external circulating pump, feeding water from the water inlet, continuously treating the wastewater, and discharging the treated wastewater from the water outlet.
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