CN113860424A - Compound sewage treatment plant of electro-catalysis photocatalysis - Google Patents
Compound sewage treatment plant of electro-catalysis photocatalysis Download PDFInfo
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- CN113860424A CN113860424A CN202111365031.3A CN202111365031A CN113860424A CN 113860424 A CN113860424 A CN 113860424A CN 202111365031 A CN202111365031 A CN 202111365031A CN 113860424 A CN113860424 A CN 113860424A
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- 239000010865 sewage Substances 0.000 title claims abstract description 25
- 238000007146 photocatalysis Methods 0.000 title claims abstract description 23
- 238000006555 catalytic reaction Methods 0.000 title abstract description 7
- 150000001875 compounds Chemical class 0.000 title description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011521 glass Substances 0.000 claims abstract description 15
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 15
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
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Images
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
- 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
-
- 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
- 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
-
- 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
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention relates to the technical field of photocatalytic treatment of water pollutants, in particular to an electrocatalytic photocatalytic composite sewage treatment device, which comprises a reaction cavity; the first reflecting layer is attached to the inner wall of the reaction cavity; a plurality of reflectors which are arranged in parallel and are arranged in the reaction cavity and between the first reflecting layers; a plurality of photoelectrocatalysis electrodes which are arranged between the two reflectors and between the reflectors and the first reflecting layer, and each photoelectrocatalysis electrode comprises a graphene photocatalysis net, an organic glass substrate and a loaded nano TiO which are sequentially arranged from top to bottom2Titanium metal mesh and a light; the photoelectrocatalysis electrode is electrically connected with power supply equipment, and the power supply equipment is arranged at the opening of the reaction cavity; the reaction cavity is also provided with a water inlet and a water outlet. The electro-catalysis photo-catalysis composite sewage treatment device realizes electro-catalysis photo-catalysisIndustrial extension of catalysis.
Description
Technical Field
The invention relates to the technical field of photocatalytic treatment of water pollutants, in particular to an electrocatalytic photocatalytic composite sewage treatment device.
Background
With the continuous development of industry, industrial wastewater, which refers to wastewater, sewage and waste liquid generated in industrial production process, contains industrial production materials, intermediate products and products lost with water and pollutants generated in the production process, is discharged in large quantity. Because industrial wastewater contains a large amount of water-insoluble particulate matters and water-soluble chemical pollutants, if the industrial wastewater is directly discharged to the outside, the industrial wastewater is bound to pollute the environment and influence human health.
However, organic substances and heavy metal particles with toxicity and heavy odor in the industrial wastewater cannot achieve a good treatment effect on the pollutants by the traditional water purification process, and when people drink tap water, the pollutants are accumulated in the human body, so that the pollutants are harmful to the health of people and even cause cancer.
In the prior art, ozone or peroxygen water is often adopted to treat wastewater, but the method has great demand on ozone or peroxygen water, high raw material cost and low treatment efficiency; the method has lower cost than the prior method because the microbes are easy to culture, but has small application range, different microbes have great requirements on the pH, temperature and material components of the water, and the general use of microbial degradation is limited by the harsh environmental requirements and the low efficiency of degrading highly toxic organic matters.
In recent years, some oxidation technologies, such as electrocatalytic photocatalysis, have been developed, which have the following advantages: (1) no secondary pollution, and can thoroughly degrade organic pollutants until the organic pollutants are completely mineralized; (2) the process is flexible, and can be simply processed and matched with other processing processes; (3) as a physical and chemical process, the method is easy to control, can meet different treatment requirements, and has gradually gained attention from academic circles at home and abroad.
In the prior art, most researches on catalytic reactions by using an electro-catalytic photocatalysis method are still in a laboratory stage, and mainly pay attention to how to improve the efficiency of the electro-catalytic photocatalysis, and the area of a used electrode is small (1-10 cm)2) The electrode is also a multi-step fine synthesized electrode, so the cost is higher, the wastewater treatment capacity is limited, and the difference with the actual wastewater treatment application is large, and the basic research of a laboratory and the engineering application cannot be combined.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the electrocatalytic photocatalytic composite sewage treatment device which can be produced in a large scale and realizes the industrial extension of electrocatalytic photocatalysis.
In order to solve the technical problems, the invention adopts the following technical scheme:
an electrocatalytic photocatalytic composite sewage treatment device, comprising: the left end and the right end are provided with open reaction cavities;
the first reflecting layer is attached to the inner wall of the reaction cavity;
the plurality of reflectors are arranged in parallel, arranged in the reaction cavity and arranged between the first reflecting layers;
a plurality of photoelectrocatalysis electrodes, it sets up in two the reflector panel, and the reflector panel with between the first reflector layer, photoelectrocatalysis electrode is including the graphite alkene photocatalysis net, organic glass base, the load nanometer TiO that set gradually from top to bottom2Titanium metal mesh and a light;
the photoelectrocatalysis electrode is electrically connected with power supply equipment, and the power supply equipment is arranged at the opening of the reaction cavity;
the reaction cavity is also provided with a water inlet and a water outlet, and valves are arranged on the water inlet and the water outlet.
Preferably, the reaction chamber is composed of two symmetrically arranged chamber units, and the cross section of each chamber unit is trapezoidal.
Preferably, the reflector includes:
the organic glass plate is arranged in the reaction cavity;
and the second light reflecting layers are attached to two sides of the organic glass plate.
Preferably, the first reflective layer and the second reflective layer are both an organ-type pleated tin foil layer, and the organ-type pleated tin foil layer is formed by folding sheet-shaped tin foil paper in an accordion manner.
Preferably, the power supply equipment is solar power supply equipment, the solar power supply equipment comprises a solar electric plate and an automatic control storage battery, the graphene photocatalysis net supports the nano TiO2The titanium metal net and the lighting lamp are respectively electrically connected with the automatic control storage battery.
Preferably, the light emitter is a light emitting diode.
Preferably, flow channels for water circulation are reserved between the photoelectrocatalysis electrode and the reflecting plate, and between the reflecting plate and the reaction cavity.
Preferably, a circulating pipe is further arranged outside the reaction cavity and between the water inlet and the water outlet, and a circulating pump is arranged on the circulating pipe
Compared with the prior art, the invention has the beneficial effects that:
1. the invention is provided with a first reflecting layer and a reflecting plate, wherein the first reflecting layer and the reflecting plate are respectively used for reflecting a tube of a light illuminator, so that light is uniformly dispersed in a reaction cavity and sufficient light sources are provided for a photoelectrocatalysis electrode;
to load nano TiO2The titanium metal net is used as an anode, the graphene photocatalysis net is used as a cathode, the light lamp is used for providing a light source, the organic glass substrate is used for loading the anode and the cathode, when sunlight irradiates the graphene photocatalysis net, the photocatalysis material loaded on the net can generate a photo-generated carrier and a photo-generated cavity to generate an oxidation reduction reaction, the water quality is purified, the black water can be changed into green water, and the graphene photocatalysis net is suitable for micro waterBiological growth, namely, a large amount of high-activity oxidation intermediates are generated on the surfaces of the graphene photocatalytic network and the photoelectric catalyst by ultraviolet irradiation and external bias voltage, so that thorough mineralization of pollutants is realized; meanwhile, the nano titanium dioxide is irradiated by light to carry out water electrolytic reaction, water or oxygen in the air is catalyzed into hydroxyl free radicals with oxidation capability, superoxide anion free radicals, active oxygen and other photoproduction active groups with oxidation capability, the energy of the photoproduction active groups is equivalent to the high temperature of 3600K, and the photoproduction active groups have strong oxidation property.
2. The invention is also provided with a circulating pipe which is used for water circulation, increases the mass transfer effect inside the reaction cavity, improves the binding capacity of the photoelectric catalyst and pollutants in water, and avoids the concentration polarization phenomenon of the polar plate due to strong disturbance on the surface of the graphene photocatalytic net.
3. The anode material, the cathode material and the illuminator used in the invention are all cheap materials in the prior art; the solar power supply equipment provides electric energy, so that the cost is saved to a certain extent; the photoelectrocatalysis electrodes are distributed in the reaction cavity in a point mode, and compared with the sewage treatment device in the prior art which adopts a large number of photoelectrocatalysis electrodes, the photoelectrocatalysis electrodes save the cost to a certain extent; the tin foil layer is used for realizing sufficient and sufficient dispersion of the light source, and then the efficient electrocatalytic photocatalytic performance of the photoelectrocatalysis electrode is realized.
Drawings
FIG. 1 is a sectional view showing the internal structure of an electrocatalytic photocatalytic composite sewage treatment apparatus according to the present invention;
FIG. 2 is a sectional view of the internal structure of a photoelectrocatalysis electrode of the electrocatalysis photocatalysis composite sewage treatment device of the invention;
description of reference numerals:
1. a reaction chamber; 2. a first light-reflecting layer; 3. a reflector; 4. a graphene photocatalytic network; 5. an organic glass substrate; 6. loaded nano TiO2The titanium metal mesh of (1); 7. a light; 8. a water inlet; 9. a water outlet; 10. a cavity unit; 11. an organic glass plate; 12. a second light-reflecting layer; 13. a solar panel; 14. a self-controlled storage battery; 15. a photoelectrocatalytic electrode; 16. a circulation pipe.
Detailed Description
The following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. The experimental methods described in the examples of the present invention are all conventional methods unless otherwise specified.
An electrocatalytic photocatalytic composite sewage treatment device comprises a reaction cavity 1, wherein an electrocatalytic photocatalytic reaction is carried out in the reaction cavity 1;
the first reflecting layer 2 is attached to the inner wall of the reaction cavity 1, and the first reflecting layer 2 is used for realizing the omnibearing reflecting effect in the reaction cavity 1;
the light reflecting plates 3 are arranged in parallel, and the light reflecting plates 3 comprise organic glass plates 11 which are arranged in the reaction cavity 1; a second light reflecting layer 12 attached to both sides of the organic glass plate 11; the organic glass plate 11 is used for bearing a second reflecting layer 12, the plurality of reflecting plates 3 are arranged in the reaction cavity 1 and between the first reflecting layers 2, and the second reflecting layer 12 and the first reflecting layers 2 interact with each other to form omnibearing uniform illumination;
a plurality of photoelectrocatalysis electrodes 15, photoelectrocatalysis electrode 15 are used for carrying out the electro-catalysis photocatalysis to industrial waste water, and it sets up in two reflector panel 3 and reflector panel 3 with between the first reflector layer 2, photoelectrocatalysis electrode 15 is including the graphite alkene photocatalysis net 4, organic glass base 5, the load nanometer TiO that set gradually from top to bottom2 Titanium metal mesh 6 and illuminating lamp 7 to load nano TiO2The titanium metal net 6 is used as an anode, the graphene photocatalytic net 4 is used as a cathode, the illuminator 7 is used for providing a light source, the organic glass substrate 5 is used for loading the anode and the cathode, and a large amount of high-activity oxidation intermediates are generated on the surfaces of the graphene photocatalytic net and the photoelectric catalyst through ultraviolet irradiation and external bias voltage, so that thorough mineralization of pollutants is realized;
the illuminating lamp 7 is a light emitting diode which is low in power consumption and long in service life, and the generated wavelength is less than 300nm, so that sufficient ultraviolet light can be provided;
the reaction chamber 1 is also provided with a water inlet 8 and a water outlet 9, valves are arranged on the water inlet 8 and the water outlet 9, the water is discharged from the water inlet 8 and then subjected to electrocatalytic photocatalytic reaction in the reaction chamber 1, and the water is discharged from the water outlet 9 after the reaction; a circulating pipe 16 is further arranged outside the reaction cavity 1 and between the water inlet 8 and the water outlet 9, a circulating pump is arranged on the circulating pipe 16, the circulating pump realizes the circulation of water in the circulating pipe 16, the mass transfer effect inside the reaction cavity 1 is increased, the binding capacity of the photoelectric catalyst and pollutants in water is improved, and meanwhile, the strong disturbance of the surface of the graphene photocatalytic net 4 avoids the phenomenon of concentration polarization of a polar plate;
and flow channels for water circulation are reserved between the photoelectrocatalysis electrode 15 and the reflecting plate 3 and between the reflecting plate 3 and the reaction cavity 1, so that the aim of omnibearing water purification is fulfilled.
Further, the reaction chamber 1 is composed of two cavity units 10 which are symmetrically arranged, and the cross section of each cavity unit 10 is trapezoidal, so that the installation of the reflector 3 and the photoelectrocatalysis electrode 15 is facilitated.
Further, the first reflective layer 2 and the second reflective layer 12 are both an organ-type pleated tin foil layer, the organ-type pleated tin foil layer is formed by folding sheet-shaped tin foil paper in an accordion manner, the organ-type pleated tin foil layer increases the contact area with light, and effective light reflection is realized.
The use principle is as follows:
when the device is used, industrial wastewater is discharged into the reaction cavity 1 through the water inlet 8, the circulating pump is started after the wastewater stays in the reaction cavity 1 for 1-2 hours, the industrial wastewater stays again after circulating in the reaction cavity 1 under the action of the circulating pump, a photocatalytic material loaded on the graphene photocatalytic network 4 can generate a photo-generated carrier and a photo-generated hole on the surface of the graphene photocatalytic network 4, an oxidation reduction reaction is generated, water quality is purified, and a large amount of high-activity oxidation intermediates are generated on the surfaces of the graphene photocatalytic network 4 and a photoelectric catalyst through ultraviolet irradiation and external bias voltage, so that pollutants are thoroughly mineralized; on the support of nano TiO2The surface of the titanium metal mesh 6 is subjected to an electrolytic reaction of water, water or oxygen in the air is catalyzed into hydroxyl radicals with oxidation capability, superoxide anion radicals, active oxygen and other photoproduction active groups with oxidation capability, and the cyclic photocatalytic electrocatalysis is repeated.
The following industrial wastewater treatment is carried out by adopting the electrocatalytic photocatalytic composite sewage treatment device of the invention, and the treatment results are as follows:
case (2): a certain coke-oven plant of inner Mongolia;
content of wastewater: reverse osmosis concentrated water quantity: 360m3D; the COD of the wastewater is 650-910 mg/L, and the ammonia nitrogen content is 25-40 mg/L;
the method comprises the following steps of performing advanced treatment on effluent of a coking plant by using the electrocatalytic photocatalytic composite sewage treatment device, allowing wastewater to stay in the electrocatalytic photocatalytic composite sewage treatment device for 1-2 hours, then performing water circulation by using a circulating pump, allowing the wastewater to stay for 1-2 hours again, repeating the stay and circulation operations for 3-5 times, wherein the total stay time is 8.5 hours, and after the treatment by using the treatment device disclosed by the invention, the COD (chemical oxygen demand) of the effluent is 58-79 mg/L, the ammonia nitrogen is 6-10mg/L, and the effluent meets the discharge requirement in GB16171-2012 (discharge standard for pollutants for coking chemical industry); the results show that the electrocatalytic photocatalytic composite sewage treatment device prepared by the invention realizes the treatment of industrial wastewater.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. An electrocatalytic photocatalytic composite sewage treatment device is characterized by comprising a reaction cavity (1);
the first light reflecting layer (2) is attached to the inner wall of the reaction cavity (1);
a plurality of reflectors (3) arranged in parallel, arranged in the reaction chamber (1), and arranged between the first reflective layers (2);
a plurality of photoelectrocatalysis electrodes (15), it sets up in two reflector panel (3) and reflector panel (3) with between first reflector layer (2), photoelectrocatalysis electrode (15) are including graphite alkene photocatalysis net (4), organic glass basement (5), load nanometer TiO that from top to bottom set gradually2A titanium metal mesh (6) and a light (7);
the photoelectrocatalysis electrode (15) is electrically connected with power supply equipment, and the power supply equipment is arranged at the opening of the reaction cavity (1);
the reaction cavity (1) is also provided with a water inlet (8) and a water outlet (9).
2. The device for treating sewage by combining electrocatalysis and photocatalysis according to claim 1, characterized in that the reaction chamber (1) is composed of two chamber units (10) which are symmetrically arranged, and the cross section of each chamber unit (10) is trapezoidal.
3. The electrocatalytic photocatalytic composite sewage treatment device according to claim 1, wherein the reflector (3) comprises:
an organic glass plate (11) arranged in the reaction chamber (1);
and the second light reflecting layer (12) is attached to two sides of the organic glass plate (11).
4. The electrocatalytic photocatalytic composite sewage treatment device according to claim 1, wherein the first reflective layer (2) and the second reflective layer (12) are both accordion-pleated tin foil layers formed by folding sheet-like tin foil paper in a pleated manner.
5. The sewage treatment plant with composite electrocatalysis and photocatalysis as claimed in claim 1, wherein the power supply equipment is solar power supply equipment which comprises a solar electric plate (13) and a self-control storage battery (14), the graphene photocatalysis net (4) and the loaded nano TiO are arranged in the sewage treatment plant2The titanium metal net (6) and the lighting lamp (7) are respectively electrically connected with the self-control storage battery (14).
6. The electrocatalytic photocatalytic composite sewage treatment device according to claim 1, wherein the light lamps (7) are light emitting diodes.
7. The device for treating sewage by combining electrocatalysis and photocatalysis according to claim 1, wherein flow channels for water circulation are reserved between the photoelectrocatalysis electrode (15) and the reflecting plate (3) and between the reflecting plate (3) and the reaction cavity (1).
8. The electrocatalytic photocatalytic composite sewage treatment device according to claim 1, wherein a circulating pipe (16) is further disposed outside the reaction chamber (1) and between the water inlet (8) and the water outlet (9), and a circulating pump is disposed on the circulating pipe (16).
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| CN202111365031.3A CN113860424B (en) | 2021-11-17 | 2021-11-17 | Electrocatalytic photocatalytic composite sewage treatment device |
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| CN202111365031.3A CN113860424B (en) | 2021-11-17 | 2021-11-17 | Electrocatalytic photocatalytic composite sewage treatment device |
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| CN107952464A (en) * | 2017-12-13 | 2018-04-24 | 大连理工大学 | A kind of novel photocatalysis material and double photochemical catalyst electrode automatic bias pollution control systems |
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