Electrolysis coupled oxidation wastewater treatment device

Abstract

The electrolytic coupled oxidation wastewater treatment device comprises a container, wherein an inner vertical pipe is arranged in the container along the vertical direction, the bottom end of the inner vertical pipe is fixed on the bottom plate of the container, a flow guide sleeve is arranged on the outer side of the inner vertical pipe along the vertical direction, the top end of the flow guide sleeve is fixed on the top plate of the container, an outer vertical pipe is arranged on the outer side of the flow guide sleeve along the vertical direction, the bottom end of the outer vertical pipe is fixed on the bottom plate of the container; an inner layer ascending channel is arranged in the inner vertical pipe, the inner layer ascending channel is connected with the top of the inner layer descending channel through the top of the inner vertical pipe, the inner layer descending channel is located between the inner side wall of the flow guide sleeve and the outer side wall of the inner vertical pipe, and the horizontal cross section of the inner layer descending channel is annular. The purpose is to provide an electrolytic coupled oxidation wastewater treatment device suitable for deep treatment of difficult-to-degrade wastewater such as printing and dyeing, chemical, pharmaceutical, papermaking and other wastewater or algae removal, sterilization and disinfection of industrial circulating cooling water, with good wastewater treatment effect, high reaction efficiency and short reaction time.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection chemical industry, and in particular to an electrolysis coupled oxidation wastewater treatment device. Background Art

[0002] Most industrial wastewater contains organic pollutants with complex components, high concentrations, strong toxicity and poor biodegradability. Conventional treatment methods are difficult to treat them to meet standards. The discharge of such wastewater not only seriously pollutes water bodies, but also restricts the survival and development of enterprises. Therefore, it is very important to seek economical and efficient advanced oxidation treatment technology for wastewater.

[0003] Wastewater oxidation technology mainly refers to the use of various physical and chemical methods such as light, electricity, magnetism, and catalysts to produce a large number of strongly oxidizing free radicals (such as hydroxyl radicals. OH and oxygen atoms), thereby oxidizing and decomposing organic matter.

[0004] Ultraviolet photon energy can destroy various bacteria, viruses and pathogenic microorganisms in the water, causing the structural parts of their genetic material to break or undergo optical polymerization reactions, thus having the ability to disinfect and sterilize. Ultraviolet disinfection is fast, has a broad spectrum, and produces few disinfection by-products, but it does not have the ability to disinfect continuously and usually needs to be used in conjunction with chemical disinfection methods.

[0005] Ozone has a high redox potential, mild reaction conditions, fast reaction speed, and can treat a wide variety of pollutants. However, the reaction of ozone with organic matter is selective, and it cannot completely oxidize and decompose organic matter into carbon dioxide and water. The intermediate products produced will restrict further oxidation of ozone. Therefore, in wastewater treatment, ozone oxidation is usually used together with other treatment processes, such as photocatalytic ozone oxidation, ozone / ultrasound method, ozone / bioactivated carbon adsorption method, etc.

[0006] Electrochemical oxidation refers to the oxidation and decomposition of organic matter adsorbed on the anode by ·OH generated by electrolysis on the anode surface. Electrochemical oxidation does not require the addition of oxidants and can generally be carried out at room temperature and pressure. The reaction process has the effects of degradation, flotation, flocculation, and sterilization. The advantage is that the reaction is more thorough, and the disadvantage is the improvement of electrolysis efficiency and the problem of electrode life. For organic wastewater of different types and different degrees of pollution, the combination of electrochemistry and other water treatment technologies can effectively improve the treatment effect and reduce energy consumption and costs.

[0007] In view of the difficult-to-degrade characteristic of wastewater, the present invention uses electrocatalysis coupled ozone oxidation and ultraviolet photolysis to deeply treat the wastewater. Summary of the invention

[0008] The purpose of the present invention is to provide an electrolytic coupled oxidation wastewater treatment device with a small size and compact structure, which is suitable for deep treatment of difficult-to-degrade wastewater such as wastewater from printing and dyeing, chemical industry, pharmaceutical industry, papermaking, etc., or algae removal, sterilization and disinfection of industrial circulating cooling water, and has good wastewater treatment effect, high reaction efficiency and short reaction time.

[0009] The electrolytic coupled oxidation wastewater treatment device of the present invention comprises a container, wherein an inner vertical pipe is arranged in the container along the vertical direction, the bottom end of the inner vertical pipe is fixed to the bottom plate of the container, a flow guide sleeve is arranged on the outer side of the inner vertical pipe along the vertical direction, the top end of the flow guide sleeve is fixed to the top plate of the container, an outer vertical pipe is arranged on the outer side of the flow guide sleeve along the vertical direction, and the bottom end of the outer vertical pipe is fixed to the bottom plate of the container;

[0010] An inner layer ascending channel is provided in the inner riser, and the inner layer ascending channel communicates with the top of the inner layer descending channel through the top of the inner riser. The inner layer descending channel is located between the inner side wall of the guide sleeve and the outer side wall of the inner riser, and the horizontal cross section of the inner layer descending channel is annular;

[0011] The lower part of the inner layer descending channel is communicated with the lower part of the outer layer ascending channel. The outer layer ascending channel is located between the outer side wall of the flow guide sleeve and the inner side wall of the outer riser. The horizontal cross section of the outer layer ascending channel is annular.

[0012] The upper part of the outer ascending channel is communicated with the upper part of the outer descending channel, the outer descending channel is located between the inner wall of the container and the outer wall of the outer riser, and the horizontal cross section of the outer descending channel is annular;

[0013] The lower part of the inner vertical pipe is communicated with the liquid outlet of the liquid inlet pipe, the lower part of the outer side wall of the container is provided with a liquid outlet pipe, the inner layer ascending channel and the outer layer ascending channel are respectively provided with ultraviolet lamp tubes, the lower part of the inner layer ascending channel and the lower part of the outer layer ascending channel are respectively provided with aerators, the aerators are communicated with the gas outlet of the air inlet pipe, the air inlet of the air inlet pipe is communicated with the ozone source, and the top of the container is provided with a gas exhaust pipe;

[0014] The inner wall of the container and the inner wall of the flow guide sleeve are external electrodes, the outer wall of the inner riser and the outer wall of the flow guide sleeve are internal electrodes, the external electrode is electrically connected to a positive electrode or a negative electrode of the power supply, and the internal electrode is electrically connected to the other electrode of the power supply.

[0015] Preferably, the container, the inner riser, the flow guide sleeve and the outer riser are cylindrical, the axes of the container, the inner riser, the flow guide sleeve and the outer riser are located in the vertical direction, and the axes of the container, the inner riser, the flow guide sleeve and the outer riser coincide with each other;

[0016] A plurality of inner riser baffles that can be used as electrodes are fixed around the outer wall of the inner riser, the plate surface of the inner riser baffles is arranged radially, and the dimension spacing between the outer end side edge of the inner riser baffle and the inner wall of the flow guide sleeve is greater than 3mm. A flow guide sleeve baffle that can be used as an electrode is arranged between adjacent inner riser baffles, the plate surface of the flow guide sleeve baffle is arranged radially, the outer end side edge of the flow guide sleeve baffle is fixedly connected to the inner wall of the flow guide sleeve, and the dimension spacing between the inner end side edge of the flow guide sleeve baffle and the outer wall of the inner riser is greater than 3mm;

[0017] A plurality of external riser partitions that can be used as electrodes are fixed around the outer wall of the external riser, the plate surface of the external riser partition is arranged radially, and the dimension spacing between the outer end side edge of the external riser partition and the inner wall of the container is greater than 3mm. Container partitions that can be used as electrodes are arranged between adjacent external riser partitions, the plate surface of the container partition is arranged radially, the outer end side edge of the container partition is fixedly connected to the inner wall of the container, and the dimension spacing between the inner end side edge of the container partition and the outer wall of the external riser is greater than 3mm.

[0018] Preferably, a defoaming device is provided at the liquid outlet pipe.

[0019] Preferably, the ultraviolet lamp is a dual-band ultraviolet lamp capable of emitting electromagnetic waves with a wavelength of 185 nm or 254 nm, and the length of the light-emitting portion of the ultraviolet lamp is 70%-80% of the length of the inner riser.

[0020] Preferably, the internal electrode includes the bottom plate of the container, and an annular insulating plate is provided between the bottom plate and the cylinder of the container. The voltage for electrolytic catalytic oxidation between the external electrode and the internal electrode is 5 to 24 V, the ozone concentration in the air intake pipe is 10 mg / L to 50 mg / L, and the reaction residence time of the wastewater is 30 min to 150 min.

[0021] Preferably, the voltage for electrolytic catalytic oxidation between the external electrode and the internal electrode is 8 to 20 V, the ozone concentration in the air intake pipe is 20 mg / L to 40 mg / L, and the reaction residence time of the wastewater is 50 min to 120 min.

[0022] Preferably, the voltage for electrolytic catalytic oxidation between the external electrode and the internal electrode is 12 to 18 V, the ozone concentration in the air intake pipe is 25 mg / L to 35 mg / L, and the reaction residence time of the wastewater is 80 min to 100 min.

[0023] Preferably, the outer electrode is made of stainless steel, the inner electrode is made of metal titanium, and the surface of the inner electrode is coated with a precious metal oxide coating.

[0024] When the electrolytic coupled oxidation wastewater treatment device of the present invention is in use, the pretreated wastewater can enter the inner ascending channel provided in the inner riser through the liquid inlet pipe, and then the wastewater will flow upward through the inner ascending channel and enter the inner descending channel, and then flow downward through the inner descending channel into the outer ascending channel, and then flow upward through the outer ascending channel into the outer descending channel, and then flow downward through the outer descending channel to the liquid outlet pipe, and be discharged from the container through the liquid outlet pipe. During this process, the aerator and the air inlet pipe will input the ozone-containing gas from the ozone gas source into the lower part of the inner ascending channel and the lower part of the outer ascending channel, and then move upward along the inner ascending channel and the outer ascending channel. During this process, the ozone will oxidize and decompose the wastewater, and then The remaining ozone gas will be discharged through the gas exhaust pipes at the top of the inner and outer ascending channels, and the ultraviolet lamps respectively arranged in the inner and outer ascending channels will simultaneously emit ultraviolet light to irradiate the wastewater. Since the treatment process of ultraviolet photolysis and ozone oxidation is concentrated inside the inner and outer ascending channels, the ultraviolet light intensity can be very high and the ozone concentration can be large, which can greatly enhance the photolysis effect of ultraviolet light and the treatment effect of ozone oxidation, so that the organic matter that is difficult to degrade in the wastewater can be degraded more efficiently; in addition, aeration of the inner and outer ascending channels using ozone-containing gas will generate a large number of bubbles, forming a gas-liquid mixed state, which is conducive to the penetration of ultraviolet light into the water body and increasing the ultraviolet light photolysis effect. At the same time, ultraviolet light promotes the decomposition of ozone in the bubbles into more active free radicals, improves the utilization rate of ozone, reduces the amount of ozone added, and has a good sterilization and disinfection effect on bacteria, fungi, mycoplasma and other microorganisms in the water body. When the wastewater after ozone and ultraviolet catalytic oxidation passes through the inner layer descending channel and the outer layer descending channel, since the inner side wall of the container and the inner side wall of the guide sleeve are external electrodes, the outer side wall of the inner riser and the outer side wall of the guide sleeve are internal electrodes, the external electrode is electrically connected to a positive electrode or a negative electrode of the power supply, and the internal electrode is electrically connected to the other electrode of the power supply, the wastewater can be further electrolytically oxidized in the inner layer descending channel and the outer layer descending channel, and the wastewater after ozone-coupled photoelectric advanced oxidation treatment will flow out through the liquid outlet pipe. After the wastewater after ozone-coupled photoelectric advanced oxidation treatment meets the discharge standard, it can be discharged or recycled. Therefore, the electrolytic coupled oxidation wastewater treatment device of the present invention is suitable for deep treatment of difficult-to-degrade wastewater such as wastewater from printing and dyeing, chemical industry, pharmaceutical industry, papermaking, etc., or algae removal, sterilization, and disinfection of industrial circulating cooling water, and has the characteristics of good treatment effect on wastewater, high reaction efficiency, and short reaction time.

[0025] The electrolytic coupled oxidation wastewater treatment device of the present invention combines ozone with ultraviolet light decomposition and electrolysis to achieve effective degradation of refractory organic matter. It also has good sterilization and disinfection effects on microorganisms such as bacteria, fungi, and mycoplasma in water bodies, and has the advantages of high efficiency and cleaning while strengthening the treatment effect. The electrolytic coupled oxidation wastewater treatment device of the present invention can simultaneously achieve ozone oxidation, ultraviolet light catalysis, and electrolytic oxidation. Compared with traditional equipment, when achieving the same treatment effect, it has the advantages of simple operation, saving equipment cost investment, and small footprint.

[0026] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front cross-sectional view of the structural schematic diagram of the electrolysis coupled oxidation wastewater treatment device of the present invention;

[0028] Figure 2 for Figure 1 A top view of a cross section;

[0029] Figure 3 It is a front view of another embodiment of the electrolysis coupled oxidation wastewater treatment device of the present invention;

[0030] Figure 4 for Figure 3 A top view of a cross section;

[0031] Figure 5 for Figure 3 A three-dimensional view of the middle container, the container partition, the flow guide sleeve and the flow guide sleeve partition portion;

[0032] Figure 6 for Figure 3 A three-dimensional view of the outer riser, outer riser baffle, inner riser and inner riser baffle. DETAILED DESCRIPTION

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, the electrolytic coupled oxidation wastewater treatment device of the present invention comprises a container 1, an inner vertical pipe 2 is arranged in the container 1 along the vertical direction, the bottom end of the inner vertical pipe 2 is fixed to the bottom plate of the container 1, a flow guide sleeve 3 is arranged on the outer side of the inner vertical pipe 2 along the vertical direction, the top end of the flow guide sleeve 3 is fixed to the top plate of the container 1, an outer vertical pipe 4 is arranged on the outer side of the flow guide sleeve 3 along the vertical direction, and the bottom end of the outer vertical pipe 4 is fixed to the bottom plate of the container 1;

[0034] An inner layer upward passage 5 is provided in the inner riser 2, and the inner layer upward passage 5 communicates with the top of the inner layer downward passage 6 through the top of the inner riser 2. The inner layer downward passage 6 is located between the inner side wall of the flow guide sleeve 3 and the outer side wall of the inner riser 2, and the horizontal cross section of the inner layer downward passage 6 is annular;

[0035] The lower part of the inner layer descending channel 6 is communicated with the lower part of the outer layer ascending channel 7. The outer layer ascending channel 7 is located between the outer side wall of the flow guide sleeve 3 and the inner side wall of the outer riser 4. The horizontal cross section of the outer layer ascending channel 7 is annular.

[0036] The upper part of the outer layer ascending channel 7 is communicated with the upper part of the outer layer descending channel 9. The outer layer descending channel 9 is located between the inner wall of the container 1 and the outer wall of the outer standpipe 4. The horizontal cross section of the outer layer descending channel 9 is annular.

[0037] The lower part of the inner riser 2 is communicated with the liquid outlet of the liquid inlet pipe 10, the lower part of the outer wall of the container 1 is provided with a liquid outlet pipe 11, the inner layer ascending channel 5 and the outer layer ascending channel 7 are respectively provided with ultraviolet lamps 12, the lower part of the inner layer ascending channel 5 and the lower part of the outer layer ascending channel 7 are respectively provided with aerators 13, the aerator 13 is communicated with the gas outlet of the air inlet pipe, the air inlet of the air inlet pipe is communicated with an ozone source (not shown in the figure), and the top of the container is provided with a gas exhaust pipe 8;

[0038] The aerator 13 can allow more ozone to dissolve into the wastewater to improve the oxidation treatment effect of ozone.

[0039] The inner wall of the container 1 and the inner wall of the flow guide sleeve 3 are external electrodes 15, the outer wall of the inner riser 2 and the outer wall of the flow guide sleeve 3 are internal electrodes 16, the external electrode 15 is electrically connected to a positive electrode or a negative electrode of the power supply, and the internal electrode 16 is electrically connected to the other electrode of the power supply.

[0040] As a further improvement of the present invention, the above-mentioned container 1, inner riser 2, flow guide sleeve 3 and outer riser 4 are cylindrical, and the axes of the container 1, inner riser 2, flow guide sleeve 3 and outer riser 4 are located in the vertical direction, and the axes of the container 1, inner riser 2, flow guide sleeve 3 and outer riser 4 coincide with each other.

[0041] like Figure 4 , Figure 5 and Figure 6 As shown, and refer to Figure 1 , a plurality of inner riser baffles 17 that can be used as electrodes can be fixed around the outer wall of the inner riser 2, the plate surface of the inner riser baffles 17 is arranged radially, and the dimension spacing between the outer end side edge of the inner riser baffles 17 and the inner side wall of the flow guide sleeve 3 is greater than 3mm, and a flow guide sleeve baffle 18 that can be used as an electrode is provided between adjacent inner riser baffles 17, the plate surface of the flow guide sleeve baffle 18 is arranged radially, the outer end side edge of the flow guide sleeve baffle 18 is fixedly connected to the inner side wall of the flow guide sleeve 3, and the dimension spacing between the inner end side edge of the flow guide sleeve baffle 18 and the outer side wall of the inner riser 2 is greater than 3mm;

[0042] A plurality of external riser partitions 19 that can be used as electrodes are fixed around the outer wall of the external riser 4, the plate surface of the external riser partition 19 is arranged radially, and the dimension spacing between the outer end side edge of the external riser partition 19 and the inner wall of the container 1 is greater than 3 mm. A container partition 20 that can be used as an electrode is arranged between adjacent external riser partitions 19, the plate surface of the container partition 20 is arranged radially, the outer end side edge of the container partition 20 is fixedly connected to the inner wall of the container 1, and the dimension spacing between the inner end side edge of the container partition 20 and the outer wall of the external riser 4 is greater than 3 mm.

[0043] The design of the above-mentioned container partition 20 and the outer riser partition 19, as well as the inner riser partition 17 and the guide sleeve partition 18 can increase the electrolysis area and reduce the distance between the positive electrode and the negative electrode, thereby improving the efficiency of electrolyzing wastewater in the outer descending channel 9 and the inner descending channel 6 and reducing the energy consumption of electrolyzing wastewater.

[0044] As a further improvement of the present invention, a defoaming device is provided at the liquid outlet pipe 11 .

[0045] As a further improvement of the present invention, the ultraviolet lamp tube 12 is a dual-band ultraviolet lamp tube capable of emitting electromagnetic waves with a wavelength of 185nm or 254nm, and the length of the light-emitting portion of the ultraviolet lamp tube 12 is 70%-80% of the length of the inner riser 2.

[0046] As a further improvement of the present invention, the above-mentioned internal electrode 16 includes a bottom plate 21 of the container 1, and an annular insulating plate 22 is provided between the bottom plate 21 and the cylinder of the container 1. The voltage for electrolytic catalytic oxidation between the external electrode 15 and the internal electrode 16 is 5 to 24 V, the ozone concentration in the intake pipe is 10 mg / L to 50 mg / L, and the reaction residence time of the wastewater is 30 min to 150 min.

[0047] The insulating plate 22 is used to prevent a short circuit between the external electrode 15 and the internal electrode 16 .

[0048] The ozone concentration in the above-mentioned liquid and air inlet pipe 6 is only 10mg / L~50mg / L, which can achieve a good ozone oxidation effect on the difficult-to-degrade organic matter in the wastewater. This is because the ultraviolet lamp in the inner vertical pipe will emit ultraviolet rays to irradiate the wastewater, and at the same time, ozone will also oxidize and decompose the wastewater. Since the treatment processes of ultraviolet photolysis and ozone oxidation are concentrated inside the inner vertical pipe, the ultraviolet light intensity can be very high and the utilization rate of ozone is high, which can greatly enhance the photolysis effect of ultraviolet light and the treatment effect of ozone oxidation, so that the difficult-to-degrade organic matter in the wastewater can be degraded more efficiently.

[0049] As a further improvement of the present invention, the voltage for electrolytic catalytic oxidation between the external electrode 15 and the internal electrode 16 is 8 to 20 V, the ozone concentration in the intake pipe is 20 mg / L to 40 mg / L, and the reaction residence time of the wastewater is 50 min to 120 min.

[0050] As a further improvement of the present invention, the voltage for electrolytic catalytic oxidation between the external electrode 15 and the internal electrode 16 is 12 to 18 V, the ozone concentration in the intake pipe is 25 mg / L to 35 mg / L, and the reaction residence time of the wastewater is 80 min to 100 min.

[0051] As a further improvement of the present invention, the external electrode 15 is made of stainless steel, the internal electrode 16 is made of metal titanium, and the surface of the internal electrode 16 is coated with a precious metal oxide coating.

[0052] When the electrolytic coupled oxidation wastewater treatment device of the present invention is in use, the pretreated wastewater can enter the inner layer ascending channel 5 provided in the inner riser 2 through the liquid inlet pipe 10, and then the wastewater will flow upward through the inner layer ascending channel 5 and enter the inner layer descending channel 6, and then flow downward through the inner layer descending channel 6 into the outer layer ascending channel 7, and then flow upward through the outer layer ascending channel 7 into the outer layer descending channel 9, and then flow downward through the outer layer descending channel 9 to the liquid outlet pipe 11, and be discharged from the container 1 through the liquid outlet pipe 11. During this process, the aerator 13 and the air inlet pipe will input the ozone-containing gas from the ozone gas source into the lower part of the inner layer ascending channel 5 and the lower part of the outer layer ascending channel 7, and then move upward along the inner layer ascending channel 5 and the outer layer ascending channel 7. During this process, the ozone will oxidize and decompose the wastewater, and then the remaining The ozone gas will be discharged through the gas exhaust pipe 8 at the top of the inner upward channel 5 and the outer upward channel 7, and the ultraviolet lamp tube 12 respectively arranged in the inner upward channel 5 and the outer upward channel 7 will simultaneously emit electromagnetic waves with a wavelength of 185nm or 254nm to irradiate the wastewater. Since the treatment processes of ultraviolet photolysis and ozone oxidation are concentrated in the inner upward channel 5 and the outer upward channel 7, the ultraviolet light intensity can be very high and the ozone concentration is large, thereby greatly enhancing the photolysis effect of ultraviolet light and the treatment effect of ozone oxidation, so that the difficult-to-degrade organic matter in the wastewater can be degraded more efficiently; in addition, aeration using ozone-containing gas in the inner upward channel 5 and the outer upward channel 7 will produce a large number of bubbles, forming a gas-liquid mixture, which is beneficial for ultraviolet light to penetrate the water body and increase the ultraviolet photolysis effect. At the same time, ultraviolet light promotes the decomposition of ozone in the bubbles into more active free radicals, improves the utilization rate of ozone, reduces the amount of ozone added, and has a good bactericidal and disinfecting effect on bacteria, fungi, mycoplasma and other microorganisms in the water.

[0053] When the wastewater after ozone and ultraviolet light catalytic oxidation passes through the inner descending channel 6 and the outer descending channel 9, since the inner wall of the container 1 and the inner wall of the guide sleeve 3 are the external electrode 15, the outer wall of the inner riser 2 and the outer wall of the guide sleeve 3 are the internal electrode 16, the external electrode 15 is electrically connected to a positive electrode or a negative electrode of the power supply, and the internal electrode 16 is electrically connected to the other electrode of the power supply, the wastewater can be further electrolytically oxidized in the inner descending channel 6 and the outer descending channel 9, and the wastewater after ozone-coupled photoelectric advanced oxidation treatment will flow out through the liquid outlet pipe 11. After the wastewater after ozone-coupled photoelectric advanced oxidation treatment meets the discharge standard, it can be discharged or recycled.

[0054] Ozone oxidation has a high redox potential, produces a large number of free radicals, and oxidizes and degrades organic matter in the water. However, ozone is selective in its reaction to organic matter and it is difficult to effectively decompose the organic matter. The present invention can achieve efficient oxidation and degradation of organic matter in wastewater under the dual effects of ozone and ultraviolet light by turning on the power switch of the ultraviolet lamp.

[0055] Ultraviolet disinfection has a broad spectrum, and the ultraviolet photon energy destroys the genetic system structure of various viruses, bacteria and pathogenic microorganisms in the water, achieving the purpose of disinfection and sterilization.

[0056] Ultraviolet light photolysis promotes the decomposition of ozone in bubbles into more active free radicals, which can effectively improve the utilization rate of ozone and reduce the amount of ozone added. Due to the presence of a large number of bubbles in ozone aeration, the mixed state of bubble liquid is conducive to the penetration of ultraviolet light into the water body and increases the effect of ultraviolet light photolysis.

[0057] After the wastewater is oxidized and decomposed by ultraviolet light and ozone, a voltage of 5 to 24V is applied to it for electrolytic catalytic oxidation. Hydroxyl free radicals are generated through electrolysis, which further realizes the catalytic degradation of pollutants, especially difficult-to-degrade organic matter such as phenol. After sufficient reaction, the wastewater is discharged from the outlet pipe.

[0058] After the ozone gas in the reaction device reacts, it is discharged through the gas exhaust pipe 8 at the top of the reaction device and subjected to ozone tail gas treatment. The ozone tail gas is destroyed by a thermal catalytic process to prevent ozone leakage and environmental pollution before being discharged.

[0059] The device of the present invention combines ozone oxidation with ultraviolet photocatalysis and electrolysis technology. It realizes wastewater ozone oxidation and photocatalysis, electrolytic catalysis and other advanced oxidation linkage treatment in the same device, greatly improving the treatment efficiency and reducing the footprint of the device. It can be widely used in the deep treatment of high-concentration, difficult-to-degrade organic wastewater.

[0060] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineers and technicians in the field should all fall within the protection scope of the claims of the present invention.

Claims

1. Electrolysis coupled oxidation wastewater treatment device, characterized by: The invention comprises a container (1), wherein an inner vertical pipe (2) is arranged in the container (1) in a vertical direction, the bottom end of the inner vertical pipe (2) is fixed on the bottom plate of the container (1), a flow guide sleeve (3) is arranged on the outer side of the inner vertical pipe (2) in a vertical direction, the top end of the flow guide sleeve (3) is fixed on the top plate of the container (1), an outer vertical pipe (4) is arranged on the outer side of the flow guide sleeve (3) in a vertical direction, and the bottom end of the outer vertical pipe (4) is fixed on the bottom plate of the container (1); An inner layer ascending channel (5) is provided in the inner riser (2). The inner layer ascending channel (5) communicates with the top of the inner layer descending channel (6) through the top of the inner riser (2). The inner layer descending channel (6) is located between the inner side wall of the flow guide sleeve (3) and the outer side wall of the inner riser (2). The horizontal cross section of the inner layer descending channel (6) is annular. The lower part of the inner layer descending channel (6) is communicated with the lower part of the outer layer ascending channel (7), the outer layer ascending channel (7) is located between the outer side wall of the flow guide sleeve (3) and the inner side wall of the outer riser (4), and the horizontal cross section of the outer layer ascending channel (7) is annular; The upper part of the outer ascending channel (7) is communicated with the upper part of the outer descending channel (9), the outer descending channel (9) is located between the inner wall of the container (1) and the outer wall of the outer standpipe (4), and the horizontal cross section of the outer descending channel (9) is annular; The lower part of the inner vertical pipe (2) is communicated with the liquid outlet of the liquid inlet pipe (10), the lower part of the outer wall of the container (1) is provided with a liquid outlet pipe (11), the inner layer ascending channel (5) and the outer layer ascending channel (7) are respectively provided with ultraviolet lamp tubes (12), the lower part of the inner layer ascending channel (5) and the lower part of the outer layer ascending channel (7) are respectively provided with aerators (13), the aerator (13) is communicated with the gas outlet of the air inlet pipe, the air inlet of the air inlet pipe is communicated with the ozone source, and the top of the container (1) is provided with a gas discharge pipe (8); The inner wall of the container (1) and the inner wall of the flow guide sleeve (3) are external electrodes (15), the outer wall of the inner riser (2) and the outer wall of the flow guide sleeve (3) are internal electrodes (16), the external electrode (15) is electrically connected to a positive electrode or a negative electrode of a power source, and the internal electrode (16) is electrically connected to another electrode of the power source.

2. The electrolytic coupled oxidation wastewater treatment device according to claim 1, characterized in that: The container (1), the inner stand pipe (2), the flow guide sleeve (3) and the outer stand pipe (4) are cylindrical, and the axes of the container (1), the inner stand pipe (2), the flow guide sleeve (3) and the outer stand pipe (4) are located in the vertical direction; A plurality of inner riser baffles (17) that can be used as electrodes are fixed around the outer wall of the inner riser (2), the plate surface of the inner riser baffles (17) is arranged radially, and the dimension spacing between the outer end side edge of the inner riser baffles (17) and the inner side wall of the guide sleeve (3) is greater than 3 mm. A guide sleeve baffle (18) that can be used as an electrode is arranged between adjacent inner riser baffles (17), the plate surface of the guide sleeve baffle (18) is arranged radially, the outer end side edge of the guide sleeve baffle (18) is fixedly connected to the inner side wall of the guide sleeve (3), and the dimension spacing between the inner end side edge of the guide sleeve baffle (18) and the outer side wall of the inner riser (2) is greater than 3 mm. A plurality of external tube partitions (19) that can be used as electrodes are fixedly disposed around the outer wall of the external tube (4), the plate surface of the external tube partition (19) being arranged radially, and the dimension spacing between the outer end side edge of the external tube partition (19) and the inner wall of the container (1) being greater than 3 mm. A container partition (20) that can be used as an electrode is disposed between adjacent external tube partitions (19), the plate surface of the container partition (20) being arranged radially, the outer end side edge of the container partition (20) being fixedly connected to the inner wall of the container (1), and the dimension spacing between the inner end side edge of the container partition (20) and the outer wall of the external tube (4) being greater than 3 mm.

3. The electrolytic coupled oxidation wastewater treatment device according to claim 2, characterized in that: The liquid outlet pipe (11) is provided with a foam removal device.

4. The electrolytic coupled oxidation wastewater treatment device according to claim 3, characterized in that: The ultraviolet lamp tube (12) is a dual-band ultraviolet lamp tube capable of emitting electromagnetic waves with a wavelength of 185nm or 254nm. The length of the light-emitting portion of the ultraviolet lamp tube (12) is 70%-80% of the length of the inner riser (2).

5. The electrolytic coupled oxidation wastewater treatment device according to any one of claims 1 to 4, characterized in that: The internal electrode (16) includes a bottom plate (21) of the container (1), and an annular insulating plate (22) is provided between the bottom plate (21) and the cylinder of the container (1). The voltage for electrolytic catalytic oxidation between the external electrode (15) and the internal electrode (16) is 5 to 24 V, the ozone concentration in the air intake pipe is 10 mg / L to 50 mg / L, and the reaction residence time of the wastewater is 30 min to 150 min.

6. The electrolytic coupled oxidation wastewater treatment device according to claim 5, characterized in that: The voltage for electrolytic catalytic oxidation between the external electrode (15) and the internal electrode (16) is 8 to 20 V, the ozone concentration in the air intake pipe is 20 mg / L to 40 mg / L, and the reaction residence time of the wastewater is 50 min to 120 min.

7. The electrolytic coupled oxidation wastewater treatment device according to claim 6, characterized in that: The voltage for electrolytic catalytic oxidation between the external electrode (15) and the internal electrode (16) is 12 to 18 V, the ozone concentration in the air intake pipe is 25 mg / L to 35 mg / L, and the reaction residence time of the wastewater is 80 min to 100 min.

8. The electrolytic coupled oxidation wastewater treatment device according to claim 7, characterized in that: The external electrode (15) is made of stainless steel, the internal electrode (16) is made of metal titanium, and the surface of the internal electrode (16) is coated with a precious metal oxide coating.

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