CN114180687A - Device and method for treating refractory organic wastewater through photoelectric coupling advanced oxidation - Google Patents
Device and method for treating refractory organic wastewater through photoelectric coupling advanced oxidation Download PDFInfo
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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
- C02F1/30—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
- C02F1/325—Irradiation devices or lamp constructions
-
- 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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
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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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physical Water Treatments (AREA)
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Abstract
The invention discloses a device and a method for treating refractory organic wastewater by photoelectric coupling advanced oxidation, the device is a photoelectrocatalysis water treatment device which utilizes perovskite load to prepare a composite electrode material on a titanium dioxide nanotube, the device is designed as an integral cylindrical internal spiral reactor and comprises an electrolytic bath, a direct current power supply, an aeration device and an illumination device, the interior of the electrolytic cell is provided with a spiral plate which divides the interior space of the electrolytic cell into a unidirectional spiral passage from the edge to the center, the spiral plate is formed by connecting a cathode plate, organic glass and an anode plate, the cathode plate and the anode plate are connected with a direct current power supply, organic wastewater enters from a water inlet arranged at the upper part of the electrolytic cell, flows to the center along a one-way spiral channel formed by the spiral plate, and finally flows out from a water outlet arranged at the bottom of the center of the electrolytic cell. The device has the advantages of simple structure, capability of effectively improving the catalytic efficiency, easiness in replacement and high utilization efficiency.
Description
Technical Field
The invention relates to a sewage treatment device, which is suitable for treating reclaimed water containing steroid estrogen, in particular to a photoelectric coupling treatment device.
Background
In recent years, the focus of environmental chemistry research has gradually shifted from traditional pollutants to trace emerging organic pollutants, wherein the more highly focused category is Steroid Estrogens (SEs) mainly comprising estrone (E1), 17 β -estradiol (E2), estriol (E3), 17 α -ethinyl estradiol (EE 2), and the like. SEs have a very significant environmental endocrine disrupting effect and can affect the reproduction, development or behaviour of an organism at very low concentrations (1 ng/L) in the environment. SEs are mainly from domestic sewage, however, the SEs cannot be completely removed by the traditional sewage treatment process, and once the SEs are discharged into a natural water body, certain risks are caused to the ecological environment.
In photocatalytic studies, nano TiO2Is favored by low price, easy availability, corrosion resistance, stable photochemical property and stronger photocatalytic oxidation capability, and particularly has remarkable effect on the aspect of degrading SEs. Due to the nanometer TiO2Can only be excited by ultraviolet light, and the photo-generated electron-hole pairs are easy to recombine. In order to improve the photocatalytic degradation efficiency, TiO needs to be treated2Doping modification is carried out to introduce impurity energy level and enhance TiO2Can further improve the absorption of visible light and TiO2Photocatalytic activity of (1). The recombination rate of photon-generated carriers can be reduced by doping metal or nonmetal, and the nano TiO is prepared2The light absorption of (a) extends into the visible region.
The Electrochemical (EC) oxidation method has the advantages of strong oxidation performance, environmental friendliness and the like, becomes one of effective methods for treating refractory organic pollutants, and is also a method for efficiently removing SEs. Recently, as a typical perovskite material, studies have shown BiFeO3Exhibits iron and magnetic polarization and is also an important visible light photocatalyst, which is considered to be one of the third generation photocatalysts because of its narrow band gap. This is achieved byIn addition, BiFeO3The ferroelectric properties of (a) can help to improve the separation efficiency of photo-generated charges and their reactivity.
Photocatalysis and electrocatalysis have different forms of energy conversion as advanced oxidation technologies with remarkable catalytic properties. In recent years, a Photoelectrocatalysis (PEC) degradation technology combining two technical advantages has become a focus of research, a photoelectrocatalysis system is increasingly applied to degradation of persistent organic pollutants and removal of heavy metals and the like, and the photoelectrocatalysis system plays an effective role in removal of SEs. PECs have proven to be a viable approach to solving the problem of recombination between photogenerated electron-hole pairs. The key technology of PEC is the preparation of electrode materials with both good optical and electrocatalytic properties photocatalytic and electrocatalytic properties with different forms of energy conversion as advanced oxidation technologies with remarkable catalytic properties. In recent years, a Photoelectrocatalysis (PEC) degradation technology combining two technical advantages has become a focus of research, a photoelectrocatalysis system is increasingly applied to degradation of persistent organic pollutants and removal of heavy metals and the like, and the photoelectrocatalysis system plays an effective role in removal of SEs. PECs have proven to be a viable approach to solving the problem of recombination between photogenerated electron-hole pairs. The key technology of PEC is the preparation of electrode materials with both good optical and electrocatalytic properties.
Deposition of BiFeO-loaded material by ultrasonic immersion3Modified TiO2TNTs have significantly improved surface photovoltage, broadened optical response range and improved visible light utilization. In addition, BiFeO3/TiO2The TNTs composite electrode shows better photoelectrocatalysis activity in the process of degrading organic pollutants under visible light. BiFeO3The nanoparticles facilitate the generation of photo-generated charges upon excitation by visible light. Thus, BiFeO3Nanoparticle-bound TiO2The composite electrode after the nanotube has higher photoelectrocatalysis performance.
Disclosure of Invention
The invention aims to provide a device for treating refractory organic wastewater by photoelectric coupling advanced oxidation, which is used for efficiently removing pollutants in regenerated water by combining the characteristics of photocatalysis and electrocatalysis.
The invention is realized by the following technical scheme, the device for treating refractory organic wastewater by photoelectric coupling advanced oxidation comprises an electrolytic tank (2), a direct current power supply (13), an aeration device (12), a circulating device and a lighting device (1), wherein a spiral plate is arranged in the electrolytic tank (2), the spiral plate divides the inner space of the electrolytic tank (2) into a one-way spiral channel from the edge to the center, the spiral plate is formed by connecting a cathode plate (3), organic glass (5) and an anode plate (6), the cathode plate (3) and the anode plate (6) are connected with the direct current power supply (13), organic wastewater enters from a water inlet (4) arranged at the upper part of the electrolytic tank (2), flows to the center along the one-way spiral channel formed by the spiral plate, and finally flows out from a water outlet (8) arranged at the bottom of the center of the electrolytic tank (2), a drain valve (9) is arranged at the water outlet (8), an aeration pipe (11) is inserted between the spiral plates, the aeration pipe (11) is connected with an aeration device (12), a light source is arranged in the electrolytic tank (2), the light source is vertically arranged at the center of the electrolytic tank (2) through a lamp tube support (10), and a device support (7) is arranged at the bottom of the device to support the whole device.
Preferably, the light source is an LED lamp tube (1) or an ultraviolet lamp.
Preferably, the spiral plate is movably connected with the bottom of the electrolytic bath (2), and the movable connection is a clamping groove connection or a hinge connection.
Preferably, the anode electrode plate adopts BiFeO3/TiO2TNTs, preparing a titanium dioxide nanotube from a high-purity titanium plate by electrochemical anodic oxidation, and preparing BiFeO by sol-gel3Loaded on the titanium dioxide nanotube; the cathode electrode plate is made of carbon cross-linked polytetrafluoroethylene (C-PTFE) and can be prepared by a sol-gel method.
Preferably, the anode plate (6) is BiFeO3/TiO2-TNTs plate, said BiFeO3/TiO2The preparation method of the TNTs comprises the following steps:
(1) ultrasonically cleaning a titanium foil through acetone and absolute ethyl alcohol respectively, and drying the titanium foil through nitrogen for later use;
(2) oxidizing a high-purity titanium plate serving as a cathode and a titanium foil serving as an anode for 2 h at a voltage of 20V, cleaning and drying the oxidized titanium plate and the oxidized titanium foil, and baking the oxidized titanium plate and the dried titanium foil for 0.5 h at a temperature of 600 ℃ to obtain TiO2A nanotube;
(3) configuration of BiFeO3Precursor solution of TiO2Placing the nanotube in the ultrasonic soaking machine for 1 h, drying at 150 deg.C, and repeating for 3 times;
(4) loading BiFeO obtained in the step (3)3Of TiO 22Placing the nanotube in a muffle furnace to bake for 2 h at 500 ℃ to prepare BiFeO3/TiO2—TNTs。
Preferably, the cathode plate (3) is a C-PTFE plate; the preparation method of the C-PTFE comprises the following steps: weighing a proper amount of carbon black, adding absolute ethyl alcohol and Polytetrafluoroethylene (PTFE) into the carbon black, stirring the mixture into paste, then using a small tablet machine to prepare the paste into sheets, cutting the sheets into rectangular blocks with the same area, respectively attaching the cut carbon black sheets to two sides of a cleaned nickel net, and pressing and forming the carbon black sheets; and finally, putting the pressed electrode into a muffle furnace to bake for 1 h at 350 ℃ to obtain the C-PTFE.
Preferably, the length and width of the cathode plate (3) are 10cm multiplied by 8cm, the length and width of the anode plate (6) are 11cm multiplied by 8cm, and the cathode plate and the anode plate are both made into a semi-arc shape; the cathode plate (3) is connected with the negative electrode of the direct current power supply (13), and the anode plate (6) is connected with the positive electrode of the direct current power supply (13); the polar plate interval of spiral board is in 1~3 cm.
Preferably, the voltage of the direct current power supply (13) is 5-30V, and the current density is 1-5 mA/cm2。
Preferably, the aeration pipes (11) of the aeration device (12) are inserted between the cathode plate and the anode plate and between the anode plate (6) and the LED lamp tube (1), the gas of the aeration device is pure oxygen or air, and the gas flow rate is 0.2-0.6L/min.
Preferably, the water outlet (8) is connected with a water outlet pipe, the other end of the water outlet pipe can return to the water inlet (4), and a circulating peristaltic pump is arranged between the water outlet pipes.
The method for treating the refractory organic wastewater by photoelectric coupling advanced oxidation comprises the following steps:
(1) starting a direct current power supply and a light source power supply, enabling the organic wastewater to be treated to enter an electrolytic bath from a water inlet and flow to the center along a one-way spiral channel formed by a spiral plate, wherein the flow rate is 20-100 mL/min, and the hydraulic retention time is 5-30 min;
(2) the treated wastewater flows out from a water outlet arranged at the bottom of the center of the electrolytic cell, and the obtained wastewater can be returned to a water inlet through a water drain pipe for circular treatment or directly discharged after reaching the standard.
The working principle of the device is as follows: the device uses BiFeO3/TiO2The photoelectric coupling catalytic system with TNTs as anode and C-PTFE as cathode has strong photoelectric catalytic activity. The cathode can generate H under the action of current2O2(ii) a The anode will generate electron-hole pair separation, and the photo-generated electrons may circulate along the external electric field under the action of the external electric field, thereby reducing the recombination rate of the electron-hole pairs and realizing the photoelectric coupling effect. In the photocoupling catalytic system, there are four processes that generate the active species hydroxyl radical (. OH): firstly, under the action of an electric field, the anode can generate a large amount of OH; second, the cathode generates H under conduction2O2And H is2O2Generating OH under illumination; thirdly, the anode is subject to electron-hole pair separation under light conditions, and these holes h+Will decompose water molecule to generate hydroxyl radical (. OH) and photo-generated electron e-A handle O2Reduction to oxygen ion radical (O)2 •−) Etc.; in addition, the device also contains Fe3+Heterogeneous Fenton system of (2), H2O2In Fe3+OH is produced by the catalytic action of (3). The concentration of active free radicals in a photoelectric coupling system is greatly improved, and the oxidative degradation of organic pollutants in the regenerated water is enhanced.
The device is designed as an integral cylindrical internal spiral reactor, the integral design is that sewage containing steroid estrogen enters from the upper part of an outer ring, flows to the center along an annular gap at a certain speed, and finally flows out from an outlet at the bottom of the center, and the design is continuousA flow reactor. The outer ring is a C-PTFE cathode, the inner ring is a photoelectrocatalysis anode, and the anode adopts BiFeO prepared by a sol-gel method3/TiO2TNTs, ultraviolet lamps or LED lamps are used in the middle. The specific mechanism is that the inlet water is firstly catalyzed by a cathode and an anode electrode, and H is generated at the cathode2O2The anode generates free radicals through the dimensionally stable electrode, and the free radicals have the effects of degrading pollutants and sterilizing microorganisms. H generated by cathode after sewage enters the inner ring2O2And the anode inner layer material generates active substances after being respectively irradiated by light, and the sewage is further degraded and sterilized by the irradiation of the light. The design maximizes the cathode and anode utilization area without interfering with cathode H production2O2The efficiency of the method can fully play the mechanism and the action of each part of a photoelectric system, simultaneously can reduce the recombination rate of photo-generated electron-hole pairs to the maximum extent, and greatly improves the effects of pollutant degradation and microbial sterilization in sewage treatment.
Compared with the prior art, the invention has the following remarkable advantages:
the device has simple structure, and has good synergistic effect by combining the electrocatalytic reaction and the photocatalytic reaction; the cathode plate and the anode plate are flexibly connected through the clamping groove and can be replaced regularly, and the design ensures that the cathode plate and the anode plate have the largest utilization area and do not interfere the cathode to generate H2O2The efficiency of (c); the device has advanced application technology, simple operation and stable operation, can remove steroid estrogen in sewage and perform synergistic sterilization.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic top view of the apparatus of the present invention;
in the figure: 1-LED lamp tube; 2-an electrolytic cell; 3-cathode plate; 4-a water inlet; 5-anode plate; 6-organic glass partition board; 7-a device holder; 8-a water outlet; 9-a drain valve; 10-lamp tube support; 11-an aerator pipe; 12-an aeration device; 13-a direct current power supply; 14-Lamp tube plug.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
Example 1: with reference to fig. 1 and 2, the device for treating refractory organic wastewater by photoelectric coupling advanced oxidation comprises an LED lamp tube 1, an electrolytic bath 2, a cathode plate 3, a water inlet 4, an organic glass partition plate 5, an anode plate 6, a device support 7, a water outlet 8, a water discharge valve 9, a lamp tube support 10, an aeration tube 11, an aeration device 12, a direct-current power supply 13 and a lamp tube plug 14.
The electrolytic cell is a circular cavity with the diameter of 10cm and the height of 10cm, the bottom of the electrolytic cell is provided with an annular clamping groove of a cathode plate and an anode plate and a conical water outlet, three supports are arranged below the bottom, a water inlet is arranged 2 cm away from the upper part of the electrolytic cell shell, and a lamp tube support is arranged on the conical water outlet; cathode C-PTFE and anode BiFeO3/TiO2The sizes of the TNTs are respectively 10cm multiplied by 8cm multiplied by 0.3 mm and 11cm multiplied by 8cm multiplied by 0.3 mm, the TNTs are made into an arc shape through the action of external force, and finally the TNTs are vertically inserted into a clamping groove of an electrolytic cell, the annular gap of a polar plate is 1-3 cm, a negative plate is connected with a negative electrode of a direct current stabilized power supply, and an anode plate is connected with a positive electrode of the direct current stabilized power supply; the LED lamp tube or the ultraviolet lamp tube is vertically inserted into a lamp tube bracket in the electrolytic bath and is connected with a power supply, and the power of the LED is 5W; the aeration device leads the oxygen to pass through the aeration pipe2Or the air is aerated between the cathode plate and the anode plate of the electrolytic cell, and the aeration rate is 0.1-0.8L/min; the sewage entering the reactor enters from the upper part of the outer ring, flows to the center at a certain speed along the annular gap, and finally flows out from the outlet at the bottom of the center, and the sewage is circulated in the device through the intelligent filling peristaltic pump in the process, wherein the flow rate is 20-500 mL/min.
Example 2: the method for treating sewage by using the device in the embodiment 1 comprises the following steps:
sewage containing EE2 (EE 2 initial concentration 1.35 mg/L, pH = 6.2) was fed from the top of the outer ring of the apparatus, flowed down the annular gap towards the center at a rate of 20 mL/min, then flowed out of the bottom outlet of the center, and finally returned to the water inlet by the circulation pump. Under the radiation of the LED lamp, the sewage in the reaction tank is subjected to photochemical reaction, electrochemical reaction and heterogeneous electro-Fenton-like reaction, so that the refractory organic pollutants in the reaction tank are efficiently degraded, the photoelectric Fenton treatment time is 60 min, and the sewage is finally discharged from the water outlet.
The concentrations of the sewage in the reactor after being treated under different voltages are detected and analyzed, and the results are shown in table 1:
watch (A)
Degradation rate of EE2 at different voltages
From the test results in table 1, it can be seen that the removal rate of EE2 by the photo-electro heterogeneous fenton reaction gradually increases with the increase of voltage within 60 min, and the removal rate reaches 100% at 30V.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a device of difficult degradation organic waste water of photoelectric coupling advanced oxidation treatment which characterized in that: comprises an electrolytic tank (2), a direct current power supply (13), an aeration device (12), a circulating device and an illumination device (1), wherein a spiral plate is arranged in the electrolytic tank (2), the spiral plate divides the inner space of the electrolytic tank (2) into one-way spiral channels from the edge to the center, the spiral plate is formed by connecting a cathode polar plate (3), organic glass (5) and an anode polar plate (6), the cathode polar plate (3) and the anode polar plate (6) are connected with the direct current power supply (13), organic wastewater enters from a water inlet (4) arranged at the upper part of the electrolytic tank (2), flows to the center along the one-way spiral channel formed by the spiral plate and finally flows out from a water outlet (8) arranged at the bottom of the center of the electrolytic tank (2), a drain valve (9) is arranged at the position of the water outlet (8), the aeration pipe (11) is inserted between the spiral plates, and the aeration pipe (11) is connected with the aeration device (12), a light source is arranged in the electrolytic cell (2), the light source is vertically arranged at the center of the electrolytic cell (2) through a lamp tube bracket (10), and a device bracket (7) is arranged at the bottom of the device to support the whole device.
2. The device for treating refractory organic wastewater by photoelectric coupling advanced oxidation according to claim 1, wherein the light source is an LED lamp tube (1) or an ultraviolet lamp.
3. The device for treating refractory organic wastewater through photoelectric coupling advanced oxidation according to claim 1, wherein the spiral plate is movably connected with the bottom of the electrolytic cell (2), and the movable connection is a clamping groove connection or a hinge connection.
4. The device for treating refractory organic wastewater by photoelectric coupled advanced oxidation according to claim 1, wherein the anode plate (6) is BiFeO3/TiO2-TNTs plate, said BiFeO3/TiO2The preparation method of the TNTs comprises the following steps:
(1) ultrasonically cleaning a titanium foil through acetone and absolute ethyl alcohol respectively, and drying the titanium foil through nitrogen for later use;
(2) oxidizing a high-purity titanium plate serving as a cathode and a titanium foil serving as an anode for 2 h at a voltage of 20V, cleaning and drying the oxidized titanium plate and the oxidized titanium foil, and baking the oxidized titanium plate and the dried titanium foil for 0.5 h at a temperature of 600 ℃ to obtain TiO2A nanotube;
(3) configuration of BiFeO3Precursor solution of TiO2Placing the nanotube in the ultrasonic soaking machine for 1 h, drying at 150 deg.C, and repeating for 3 times;
(4) loading BiFeO obtained in the step (3)3Of TiO 22Placing the nanotube in a muffle furnace to bake for 2 h at 500 ℃ to prepare BiFeO3/TiO2-TNTs。
5. The device for treating refractory organic wastewater by photoelectric coupling advanced oxidation according to claim 1, wherein the cathode plate (3) is a C-PTFE (carbon-polytetrafluoroethylene) plate; the preparation method of the C-PTFE comprises the following steps: weighing carbon black, adding absolute ethyl alcohol and Polytetrafluoroethylene (PTFE) and stirring into paste, then making the paste into sheets by a small tablet machine, cutting the sheets into rectangular blocks with the same area, respectively attaching the cut carbon black sheets to two sides of a cleaned nickel screen, and pressing and forming; and finally, putting the pressed electrode into a muffle furnace to bake for 1 h at 350 ℃ to obtain the C-PTFE.
6. The device for treating refractory organic wastewater by photoelectric coupling advanced oxidation according to claim 1, wherein the cathode plate (3) has a length and width of 10cm x 8cm, and the anode plate (6) has a length and width of 11cm x 8cm, and are both made into a semi-arc shape; the cathode plate (3) is connected with the negative electrode of the direct current power supply (13), and the anode plate (6) is connected with the positive electrode of the direct current power supply (13); the polar plate interval of spiral board is in 1~3 cm.
7. The apparatus for treating refractory organic wastewater by photoelectric coupled advanced oxidation according to claim 1, wherein: the voltage of the direct current power supply (13) is 5-30V, and the current density is 1-5 mA/cm2。
8. The apparatus for treating refractory organic wastewater by photoelectric coupled advanced oxidation according to claim 1, wherein: the aeration pipes (11) of the aeration device (12) are inserted between the cathode plate and the anode plate and between the anode plate (6) and the LED lamp tube (1), the gas of the aeration device is pure oxygen or air, and the gas flow is 0.2-0.6L/min.
9. The apparatus for treating refractory organic wastewater by photoelectric coupled advanced oxidation according to claim 1, wherein: the water outlet (8) is connected with a water outlet pipe, the other end of the water outlet pipe can return to the water inlet (4), and a circulating peristaltic pump is installed between the water outlet pipes.
10. A method for treating refractory organic wastewater by photoelectric coupling advanced oxidation according to any one of claims 1 to 9, characterized by comprising the following steps:
(1) starting a direct current power supply and a light source power supply, enabling the organic wastewater to be treated to enter an electrolytic bath from a water inlet and flow to the center along a one-way spiral channel formed by a spiral plate, wherein the flow rate is 20-100 mL/min, and the hydraulic retention time is 5-30 min;
(2) the treated wastewater flows out from a water outlet arranged at the bottom of the center of the electrolytic cell, and the obtained wastewater can be returned to a water inlet through a water drain pipe for circular treatment or directly discharged after reaching the standard.
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| CN1600697A (en) * | 2004-09-29 | 2005-03-30 | 浙江大学 | Equipment and method of homogeneous photochemistry and electrochemical oxidation unit for processing organic waste water |
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| CN103908969A (en) * | 2013-11-15 | 2014-07-09 | 大连理工大学 | Preparation method of BiFeO3 nano particle compounded TiO2 nanotube array electrode material |
| CN111115916A (en) * | 2018-10-31 | 2020-05-08 | 中石化节能环保工程科技有限公司 | Device and method for treating fracturing flow-back fluid of oil and gas field |
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| CN1600697A (en) * | 2004-09-29 | 2005-03-30 | 浙江大学 | Equipment and method of homogeneous photochemistry and electrochemical oxidation unit for processing organic waste water |
| CN101817576A (en) * | 2010-06-03 | 2010-09-01 | 哈尔滨工业大学（威海） | Seawater electrofiltration desalting method and device |
| CN103908969A (en) * | 2013-11-15 | 2014-07-09 | 大连理工大学 | Preparation method of BiFeO3 nano particle compounded TiO2 nanotube array electrode material |
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