Wastewater treatment apparatus based on catalytically activated electrode plates

Abstract

The application relates to the technical field of wastewater treatment, in particular to a wastewater treatment device based on a catalytic activation electrode plate, which comprises a wastewater tower, a multistage electrolysis unit and an oxygen solubility increasing unit. The multistage electrolysis unit is provided with a plurality of electrolysis assemblies arranged in an inner cavity from bottom to top. The oxygen solubility increasing unit is provided with a water pump and a reflux pipe. The multistage electrolysis unit is used to realize multistage electrocatalytic treatment of pollutants in water. The catalytic activation electrode plate can also introduce air or ozone according to water quality changes while realizing electrocatalytic treatment, so as to realize chemical oxidation treatment of the pollutants in water. Part of the wastewater after electrocatalytic treatment and chemical oxidation treatment is discharged from a water outlet, and the other part of the wastewater is pumped back to the lower end of the inner cavity by the oxygen solubility increasing unit, so as to promote the flow of the wastewater, supplement oxygen in the form of air through the first Venturi structure in the reflux, and play a coordinating role in the electrocatalytic treatment process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a wastewater treatment device based on a catalytically activated electrode plate. BACKGROUND

[0002] Water treatment catalyst is a material for treating harmful substances in water. The material can catalyze chemical reactions to convert harmful chemical substances into harmless chemical substances, thereby purifying water quality. These catalysts are usually composed of active substances and carriers. The active substance can be metal, oxide or carbon-based material, etc., and the carrier can be alumina, silica gel or activated carbon, etc.; these catalysts can catalyze oxidizing agents such as ozone and hydrogen peroxide to produce hydroxyl radicals, and the oxidation-reduction potential of hydroxyl radical is 2.8V, only next to fluorine. However, a large amount of hydroxyl radicals need to be generated by using a suitable catalyst and a corresponding device.

[0003] Currently, there are the following methods to generate hydroxyl radicals:

[0004] (1) Electro-Fenton method, which uses electricity to generate a combination of Fe 2+ and H2O2. It can effectively oxidize and degrade organic pollutants in wastewater.

[0005] (2) Electrolytic oxidation method, under the action of an external electric field, the anode can directly or indirectly generate hydroxyl radicals with strong oxidation activity.

[0006] (3) Semiconductor electrocatalysis method, because some semiconductor materials have good photochemical properties and active electrochemical behavior, in recent years, the use of semiconductor materials to make electrodes in organic wastewater has attracted the attention of many researchers.

[0007] (4) Photoelectrocatalysis method, under the irradiation of ultraviolet light and the action of an external electric field, there will also be a "hole" effect in the TiO2 semiconductor. This method of generating ·OH by combining light and electricity is also called photoelectrocatalysis method.

[0008] Different technologies use different catalytic materials. Even if the same material is used, the macroscopic morphology of the material is also very different. It is impossible to realize the timely change of multiple different treatment methods in the same reactor according to the different water quality. Because the water quality of wastewater is changing all the time, especially the same equipment may have to cope with different water quality at any time, especially in some chemical industrial parks, different factories discharge different pollutants, some factories discharge in the morning, and some factories discharge in the afternoon, so the water quality will be obviously different at different times. According to different water quality, the general reaction device cannot adjust the treatment mode, especially the biochemical reaction tank, which cannot be adjusted according to the change of water quality. SUMMARY

[0009] The technical problem solved by the present application is: in order to solve the deficiencies in the prior art, the present application provides a wastewater treatment device based on catalytically activated electrode plate.

[0010] The technical solution adopted by the present application to solve its technical problem is: a wastewater treatment device based on catalytically activated electrode plate, comprising:

[0011] The wastewater tower has an inner cavity for containing wastewater, the lower end of the inner cavity is provided with a water inlet, and the upper end of the inner cavity is provided with a water outlet;

[0012] The multistage electrolysis unit has a plurality of electrolysis assemblies arranged in the inner cavity from bottom to top, the height of the uppermost electrolysis assembly is lower than the height of the water outlet, the electrolysis assembly comprises positive and negative electrode plates spaced from each other, the positive and negative electrode plates are both catalytically activated electrode plates, the catalytically activated electrode plate has a metal substrate, an embedded pipe and a porous layer body for catalytic oxidation of organic matter in wastewater, the upper and lower surfaces of the metal substrate are both provided with the porous layer body, the inlet of the embedded pipe is located outside the wastewater tower, the outlet of the embedded pipe extends to the metal substrate, and the fluid flowing out of the outlet of the embedded pipe enters the inner cavity through the porous layer body;

[0013] And an oxygen solubility increasing unit has a water pump and a reflux pipe, the inlet of the water pump is communicated with the region above the uppermost electrolysis assembly in the inner cavity, the outlet of the water pump is communicated with one end of the reflux pipe, the other end of the reflux pipe has a pipe opening extending into the inner cavity from top to bottom and located below the lowermost electrolysis assembly, and the part of the reflux pipe located outside the inner cavity has a first Venturi structure for inhaling air.

[0014] Further, the material of the porous layer body is metal, and the surface of the porous layer body is loaded with manganese dioxide, the porous layer body has a plurality of pores, the fluid flowing out of the outlet of the embedded pipe enters the inner cavity through the pores, and the inner wall of at least part of the pores is loaded with catalyst particles.

[0015] Further, the porous layer body is formed by pressing a plurality of metal shavings loaded with manganese dioxide, and the catalyst particles are clamped in the porous layer body by the metal shavings.

[0016] Further, the upper surface of the metal substrate is penetrated downwardly by a plurality of overflow holes.

[0017] Further, the metal substrate has an air cavity communicated with the embedded pipe, the inner wall of the air cavity is penetrated by a plurality of air bubble holes, the porous layer body on the upper surface of the metal substrate covers the air bubble holes on the upper surface of the metal substrate, and the porous layer body on the lower surface of the metal substrate covers the air bubble holes on the lower surface of the metal substrate.

[0018] Further, the multi-stage electrolysis unit has at least three electrolysis assemblies, i.e., a first-stage electrolysis assembly, a second-stage electrolysis assembly and a third-stage electrolysis assembly;

[0019] The first-stage electrolysis assembly, the second-stage electrolysis assembly and the third-stage electrolysis assembly are arranged in the inner cavity in sequence from bottom to top;

[0020] The height of the first-stage electrolysis assembly is higher than the height of the water inlet, and the height of the third-stage electrolysis assembly is lower than the height of the water outlet;

[0021] Further, the first Venturi structure comprises a first contraction pipe section, a first throat pipe section and a first expansion pipe section which are connected in sequence along the axial direction of the reflux pipe from top to bottom, and the first throat pipe section is provided with an external air pipe which is in communication with the first throat pipe section at one end and with the outside at the other end.

[0022] Further, the reflux pipe has a second Venturi structure at the position between the first-stage electrolysis assembly and the second-stage electrolysis assembly in the inner cavity;

[0023] The second Venturi structure comprises a second contraction pipe section, a second throat pipe section and a second expansion pipe section which are connected in sequence along the axial direction of the reflux pipe from top to bottom;

[0024] The second Venturi structure is provided with a hollow pipe, and a cavity is formed between the inner pipe wall of the hollow pipe, the outer pipe wall of the second contraction pipe section, the outer pipe wall of the second throat pipe section and the outer pipe wall of the second expansion pipe section, the outer peripheral wall of the hollow pipe has a plurality of hollow holes which are in communication with the cavity, and the inner pipe wall of the second expansion pipe section has a plurality of inner holes which are in communication with the cavity.

[0025] Further, the part of the reflux pipe which passes through the first-stage electrolysis assembly is a first variable-diameter pipe section, and the part of the reflux pipe which passes through the second-stage electrolysis assembly is a second variable-diameter pipe section, and the cross-sectional area of the first variable-diameter pipe section and the cross-sectional area of the second variable-diameter pipe section gradually increase from top to bottom;

[0026] The part of the reflux pipe which is between the first-stage electrolysis assembly and the second-stage electrolysis assembly has a sudden change pipe section which has a large upper end and a small lower end, the upper end face of the sudden change pipe section has an upper pipe opening and a communication hole, the upper pipe opening is in communication with the lower end of the second variable-diameter pipe section, the communication hole is located on the outer side of the upper pipe opening and is in communication with the inner cavity and the sudden change pipe section respectively, the lower end of the sudden change pipe section is in communication with the upper end of the first variable-diameter pipe section, and the maximum cross-sectional area of the upper end of the sudden change pipe section is larger than the maximum cross-sectional area of the lower end of the second variable-diameter pipe section.

[0027] Further, the upper end of the wastewater tower is provided with a reflux pool, the inner cavity is in communication with the reflux pool through a reflux port, the height of the reflux port is lower than the height of the water outlet, and the water pump is arranged in the reflux pool.

[0028] The beneficial effects of the present application are: the present application utilizes multi-stage electrolysis units to realize multi-stage electro-catalytic treatment of pollutants in water, reduce COD in wastewater, and the catalytic activation electrode plate of the multi-stage electrolysis unit can pass in air or ozone according to water quality changes while realizing electro-catalytic treatment, realize chemical oxidation treatment of pollutants in water, part of the wastewater after electro-catalytic treatment and chemical oxidation treatment is discharged from the drain, and the other part of the wastewater is pumped back to the lower end of the inner cavity by the oxygen solubility increasing unit, which can promote the flow of wastewater, and can also supplement oxygen in the reflux by the first Venturi structure in the form of air suction, and play a coordinating role with the electro-catalytic treatment process.

[0029] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, which description should be taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The present application is further described below in conjunction with the drawings and examples.

[0031] Figure 1 is a schematic diagram of the wastewater treatment device of the present application based on catalytically activated electrode plate.

[0032] Figure 2 is a schematic diagram of the catalytically activated electrode plate in the present application;

[0033] Figure 3 is a schematic diagram of the return pipe at the first Venturi structure in the present application;

[0034] Figure 4 is a schematic diagram of the return pipe at the second Venturi structure in the present application;

[0035] Figure 5 is a schematic diagram of the return pipe at the first variable diameter pipe section in the present application.

[0036] In the figure: 1, first-stage electrolysis assembly;

[0037] 2, second-stage electrolysis assembly;

[0038] 3, third-stage electrolysis assembly;

[0039] 4, wastewater tower, 41, inner cavity, 42, water inlet, 43, drain;

[0040] 5, catalytically activated electrode plate, 51, metal substrate, 511, overflow hole, 512, air cavity, 513, bubble hole, 52, built-in pipe, 53, porous layer;

[0041] 6, water pump;

[0042] 7, reflux pipe, 71, first venturi structure, 711, first convergent pipe section, 712, first throat pipe section, 7121, external air pipe, 713, first divergent pipe section; 72, second venturi structure, 721, second convergent pipe section, 722, second throat pipe section, 7221, inner hole, 723, second divergent pipe section; 73, first reducing pipe section, 74, sudden change pipe section, 741, upper pipe opening, 742, communication hole, 75, second reducing pipe section;

[0043] 8, hollow pipe, 81, hollow hole, 82, partition cavity;

[0044] 9, reflux pool. DETAILED DESCRIPTION

[0045] The application will now be described in further detail with reference to the drawings. These drawings are simplified schematic illustrations of the basic structure of the application and are therefore only to show the features relevant to the application, and the directions and references (e.g. up, down, left, right, etc.) can only be used to facilitate the description of the features in the drawings. The following detailed description is therefore not to be taken in a limiting sense and the scope of the subject matter sought to be protected is defined only by the claims that follow and equivalents thereof.

[0046] As shown in the drawings, a wastewater treatment device based on catalytically activated electrode plates comprises: Figures 1-5

[0047] A wastewater tower 4 has an inner cavity 41 for containing wastewater, the lower end of the inner cavity 41 is provided with a water inlet 42, the upper end of the inner cavity 41 is provided with a water outlet 43, and the upper end of the inner cavity 41 can be provided with a vent opening to the outside;

[0048] A multi-stage electrolysis unit has a plurality of electrolysis assemblies arranged in the inner cavity 41 from bottom to top, the height of the uppermost electrolysis assembly is lower than the height of the water outlet 43, the electrolysis assembly comprises positive and negative electrode plates arranged vertically, the spacing between the positive and negative electrode plates of the same electrolysis assembly can be 15±5 cm, the spacing between the adjacent two electrolysis assemblies is greater than the spacing between the positive and negative electrode plates of the same electrolysis assembly, the positive and negative electrode plates of the same electrolysis assembly are respectively electrically connected to the positive and negative poles of a direct current power supply, the positive and negative electrode plates are both catalytically activated electrode plates 5, the catalytically activated electrode plate 5 has a metal substrate 51, an embedded pipe 52 and a porous layer body 53 for catalytic oxidation of organic matter in wastewater, the upper and lower surfaces of the metal substrate 51 are both provided with the porous layer body 53, the inlet of the embedded pipe 52 is located outside the wastewater tower 4, the outlet of the embedded pipe 52 extends to the metal substrate 51, and the fluid flowing out of the outlet of the embedded pipe 52 enters the inner cavity 41 through the porous layer body 53;

[0049] ​and an oxygen solubility increasing unit having a water pump 6 and a reflux pipe 7, the inlet of the water pump 6 and a region above the uppermost electrolytic assembly in the inner cavity 41 are communicated, the outlet of the water pump 6 and one end of the reflux pipe 7 are communicated, the other end of the reflux pipe 7 has a nozzle extending into the inner cavity 41 from top to bottom and located below the lowermost electrolytic assembly, and the reflux pipe 7 has a first Venturi structure 71 outside the inner cavity 41 for inhaling air.

[0050] In the embodiment, the wastewater in the inner cavity 41 passes through the multiple-stage electrolytic units in sequence upwards, so that the pollutants in the water are subjected to multi-stage electrocatalytic treatment, and the COD in the wastewater is reduced. The catalytically activated electrode plate 5 of the multiple-stage electrolytic unit can not only achieve electrocatalytic treatment, but also can pass in air or ozone according to the change of water quality, so as to achieve chemical oxidation treatment of the pollutants in the water. After the electrocatalytic treatment and the chemical oxidation treatment, part of the wastewater is discharged from the water outlet 43, and the other part of the wastewater is pumped back to the lower end of the inner cavity 41 by the oxygen solubility increasing unit, so as to promote the flow of the wastewater, and the oxygen can be supplemented in the reflux pipe 7 by the first Venturi structure 71 inhaling air, which plays a coordinating role in the electrocatalytic treatment process.

[0051] The specific advantages of the embodiment can be, but are not limited to, the following points:

[0052] First, the catalytically activated electrode plate 5 is formed by arranging the porous layer body 53 and the built-in pipe 52 on the metal base plate 51. The catalytically activated electrode plate 5 can not only play an electrocatalytic function, but also can pass in air or ozone from the built-in pipe 52 according to the change of water quality to form a chemical oxidation effect, so as to adapt to different treatment requirements. Therefore, the catalytically activated electrode plate 5 can be adjusted at any time according to the change of water quality, and has better adaptability. The built-in pipe 52 can also pass in clean water for cleaning.

[0053] Second, the porous layer body 53 can make the air or oxidant injected into the built-in pipe 52 fully diffuse. When the fluid injected into the built-in pipe 52 is air or gaseous oxidant (for example, ozone), the porous layer body 53 can make the fluid form bubbles and enter the inner cavity 41. Even the porous layer body 53 can make the fluid form many tiny bubbles. The built-in pipe 52 can also be connected to a direct current power supply and electrically connected to the catalytically activated electrode plate 5 where the built-in pipe 52 is located, that is, the built-in pipe 52 becomes a lead wire of the catalytically activated electrode plate 5.

[0054] Third, the reflux process realized by the oxygen solubility increasing unit can not only promote the reflux of the wastewater, but also supplement oxygen in the reflux process, which coordinates with the electrocatalytic process, so that hydrogen peroxide can be generated on the surface of the catalytically activated electrode plate 5. The hydrogen peroxide reacts with the catalyst particles in the porous layer body 53 to form hydroxyl radicals, which degrade the organic matter in the wastewater.

[0055] In some examples, as Figure 2As shown, the porous layer body 53 is made of metal, the surface of the porous layer body 53 is loaded with manganese dioxide, the fluid flowing out of the outlet of the built-in tube 52 enters the inner cavity 41 through the pores, and the inner wall of at least part of the pores is loaded with catalyst particles.

[0056] The porous layer body 53 is formed by pressing a plurality of metal shavings loaded with manganese dioxide, the catalyst particles are clamped in the porous layer body 53 by the metal shavings, the pores can be naturally formed during the pressing process of the porous layer body 53, or can be formed by machining;

[0057] The porous layer body 53 is formed by pressing metal shavings, which can fix catalyst particles, expand the specific surface area, and enable the catalytic activated electrode plate 5 to have a synergistic catalytic ability of two or more catalysts;

[0058] For example, the fixed catalyst particles are electrically conductive activated carbon particles loaded with catalyst, and the activated carbon particles are in contact with the electrode, which can turn the activated carbon particles into a porous electrode to expand the electrode area.

[0059] The catalyst particles can also increase the roughness of the pores, making it easier for pollutants in wastewater to contact the catalyst particles;

[0060] Due to the presence of catalyst particles, even if a large force is used for pressing, there will always be gaps between the metal shavings and the catalyst particles, which can allow airflow or water flow to pass through.

[0061] The metal shavings in the porous layer body 53 can include copper shavings and iron shavings, and the copper shavings and iron shavings are mixed and pressed to form the porous layer body 53, which enables the catalytic activated electrode plate 5 to form an in-situ electrode.

[0062] In actual use, the porous layer body 53 in the embodiment can be simply regarded as an ozone catalytic filler, can be an electrocatalytic electrode material, can be an aeration electrocatalytic electrode plate, can be an iron-copper micro-electrolysis material, or can be used in combination with two or more functions, according to different water quality, one or more technologies can be used to degrade organic matter, so that the same reactor can have multiple superimposed functions.

[0063] It is worth noting that the catalyst particles can also be fixed to the inner wall of the pores by means of glue.

[0064] For example, the metal shavings are derived from mechanical processing scraps, which can be copper, steel or stainless steel, or mixed shavings of multiple materials. After removing surface oil, the shavings are placed in a mixed solution of MnSO4 and KMnO4 for hydrothermal reaction. After the reaction, the shavings are naturally cooled to room temperature, cleaned and obtained as manganese dioxide loaded metal shavings. Specifically, the metal shavings are iron shavings, which are surface treated to have catalytic oxidation ability.

[0065] The mixed solution of MnSO4 and KMnO4 has a molar ratio of 3:2-1, wherein the concentration of MnSO4 is 0.5-3.0 mMol / L, and preferably 2 mMol / L. The hydrothermal reaction is carried out at a temperature of 120-200°C, and preferably 200°C, for 20-24 hours, and preferably 24 hours.

[0066] The manganese dioxide loaded metal shavings are sprayed with water-soluble glue, and the catalyst particles are adhered to the surface of the metal shavings while the glue is still wet. Then the metal shavings are pressed into a block-shaped porous layer 53, and the porous layer 53 is fixedly connected to the metal substrate 51 by screwing, welding or riveting. Alternatively, metal shavings are laid on both upper and lower sides of the metal substrate 51, and the metal shavings are adhered with catalyst particles by spraying water-soluble glue, and then pressed and compacted. During the pressing process, the water-soluble glue is dissolved in hot water, and the metal shavings are compacted so that the catalyst particles are completely trapped inside the pressed catalytically activated electrode plate 5.

[0067] The catalyst particles are commercially available or synthesized according to public information, and have obvious activation effect on hydrogen peroxide, persulfate and sodium hypochlorite. The catalyst particles can be cobalt oxide, cobaltate, copper oxide or ferrate, etc.

[0068] In some examples, the upper surface of the metal substrate 51 is penetrated by a plurality of overflow holes 511, so that the wastewater in the inner cavity 41 can increase the contact rate with the catalytically activated electrode plate 5 when flowing upward.

[0069] In some examples, the metal substrate 51 has a gas cavity 512 in communication with the built-in pipe 52, and the inner wall of the gas cavity 512 is penetrated by a plurality of bubble holes 513. The porous layer 53 on the upper surface of the metal substrate 51 covers the bubble holes 513 on the upper surface of the metal substrate 51, and the porous layer 53 on the lower surface of the metal substrate 51 covers the bubble holes 513 on the lower surface of the metal substrate 51. The gas in the built-in pipe 52 reaches the gas cavity 512, and then reaches each bubble hole 513 from the gas cavity 512 relatively uniformly. Then the gas reaches the porous layer 53 from the bubble holes 513, and finally enters the inner cavity 41 from the pores of the porous layer 53.

[0070] In some examples, the multi-stage electrolysis unit has at least three electrolysis assemblies, namely a first-stage electrolysis assembly 1, a second-stage electrolysis assembly 2, and a third-stage electrolysis assembly 3;

[0071] The first-stage electrolysis assembly 1, the second-stage electrolysis assembly 2, and the third-stage electrolysis assembly 3 are arranged in the inner cavity 41 from bottom to top; the return pipe 7 passes through the third-stage electrolysis assembly 3, the second-stage electrolysis assembly 2, and the first-stage electrolysis assembly 1 in sequence from bottom to top, and the inlet of the water pump 6 is in communication with a region in the inner cavity 41 above the third-stage electrolysis assembly 3;

[0072] The height of the first-stage electrolysis assembly 1 is higher than the height of the water inlet 42, and the height of the third-stage electrolysis assembly 3 is lower than the height of the water outlet 43. The catalyst particles on different electrolysis assemblies can be different to better treat different water quality.

[0073] In some examples, as shown in Figure 3 The first Venturi structure 71 includes a first contraction pipe segment 711, a first throat pipe segment 712, and a first expansion pipe segment 713 connected in sequence from bottom to top on the return pipe 7 along the axial direction of the return pipe 7. The cross-sectional area of the first contraction pipe segment 711 gradually decreases from bottom to top, the cross-sectional area of the first expansion pipe segment 713 gradually increases from bottom to top, the minimum aperture of the first contraction pipe segment 711 and the first expansion pipe segment 713 are equal to the aperture of the first throat pipe segment 712, and the first throat pipe segment 712 is provided with an external air pipe 7121, one end of the external air pipe 7121 is in communication with the first throat pipe segment 712, and the other end is in communication with the outside;

[0074] Thus, when the wastewater is returned from the return pipe 7 to the inner cavity 41, air can be sucked into the first throat pipe segment 712 through the external air pipe 7121, the oxygen solubility in the wastewater in the return pipe 7 is increased, and oxygen can be supplemented in the process of return, so that the water can generate hydrogen peroxide on the surface of the catalytically activated electrode plate 5, the hydrogen peroxide reacts with the catalyst particles at the metal shavings to form hydroxyl radicals, and the organic matter in the wastewater is degraded.

[0075] In some examples, as shown in Figure 1 and 4 The part of the return pipe 7 between the first-stage electrolysis assembly 1 and the second-stage electrolysis assembly 2 in the inner cavity 41 has a second Venturi structure 72;

[0076] The second Venturi structure 72 includes a second contraction section 721, a second throat section 722, and a second expansion section 723 located on the return pipe 7 and connected downwards along the axis of the return pipe 7. The cross-sectional area of ​​the second contraction section 721 gradually decreases downwards, while the cross-sectional area of ​​the second expansion section 723 gradually increases downwards. The minimum aperture of both the second contraction section 721 and the second expansion section 723 is equal to the aperture of the second throat section 722. The second Venturi structure 72 can draw in wastewater from the inner hole 7221, promoting water recirculation.

[0077] The second Venturi structure 72 is fitted with a perforated tube 8. A cavity 82 is formed between the inner wall of the perforated tube 8, the outer wall of the second contraction section 721, the outer wall of the second throat section 722, and the outer wall of the second expansion section 723. The outer peripheral wall of the perforated tube 8 has several perforated holes 81 that communicate with the cavity 82. The inner wall of the second throat section 722 has several inner holes 7221 that communicate with the cavity 82. The perforated tube 8 is fitted over the second Venturi structure 72, which can ensure strength and allow water in the inner cavity 41 to be drawn into the return tube 7 in a relatively gentle manner.

[0078] In some examples, such as Figure 5 As shown, the part of the return pipe 7 that passes through the primary electrolysis component 1 is the first variable diameter pipe section 73, and the part that passes through the secondary electrolysis component 2 is the second variable diameter pipe section 75. The cross-sectional area of ​​the first variable diameter pipe section 73 and the cross-sectional area of ​​the second variable diameter pipe section 75 gradually increase from top to bottom.

[0079] The reflux pipe 7 has a transitional tube segment 74 located between the primary electrolysis unit 1 and the secondary electrolysis unit 2, which is larger at the top and smaller at the bottom. Multiple transitional tube segments 74 can also be provided. The upper end face of the transitional tube segment 74 has an upper pipe opening 741 and a connecting hole 742. Multiple connecting holes 742 are arranged at intervals around the upper pipe opening 741. The upper pipe opening 741 is connected to the lower end of the second reducing pipe segment 75. The lower end of the transitional tube segment 74 is connected to the upper end of the first reducing pipe segment 73. The maximum cross-sectional area of ​​the upper end of the transitional tube segment 74 is greater than the maximum cross-sectional area of ​​the lower end of the second reducing pipe segment 75. The first reducing pipe segment 73, the transitional tube segment 74, and the second reducing pipe segment 75 can all be conical.

[0080] When wastewater flows downwards through the thickened second reducing pipe section 75, the wastewater near the inner wall of the second reducing pipe section 75 exhibits slow flow, creating turbulence and eddies. Some dissolved oxygen escapes from this area, forming small bubbles. These small bubbles, carried by the wastewater through the abrupt change pipe section 74, easily float to the upper corner of the abrupt change pipe section 74 and move upwards through the connecting hole 742 into the inner cavity 41, increasing the dissolved oxygen concentration at the electrolysis assembly. Figure 5 As shown, Figure 5The middle dotted arrow represents the flow path of the small bubbles, and the realization arrow represents the flow direction of the wastewater;

[0081] The wastewater continues to flow downward to the first gradually thickening pipe section 73, and turbulence also occurs, forming eddies, and a portion of the dissolved oxygen escapes from here to form small bubbles, which eventually flow out from the bottom. The reflux pipe 7 can be spliced from an upper pipe section and a lower pipe section, for example, the upper pipe section and the lower pipe section are threadedly connected, the first Venturi structure 71, the second Venturi structure 72, the second gradually thickening pipe section 75, the sudden change pipe section 74, and the first gradually thickening pipe section 73 are coaxially arranged and sequentially communicated, and the first Venturi structure 71, the second Venturi structure 72, and the second gradually thickening pipe section 75 are formed on the upper pipe section, and the sudden change pipe section 74 and the first gradually thickening pipe section 73 are formed on the lower pipe section.

[0082] In some examples, the upper end of the wastewater tower 4 is provided with a reflux pool 9, the inner cavity 41 is communicated with the reflux pool 9 through a reflux port, the height of the reflux port is lower than the height of the water outlet 43, and the water pump 6 is arranged in the reflux pool 9. The water pump 6 can be a submersible pump 6, the wastewater at the upper end of the inner cavity 41 enters the reflux pool 9 through the reflux port, and then is pumped back to the lower end of the inner cavity 41 by the reflux pump through the reflux pipe 7.

[0083] The principle of the wastewater treatment device based on the catalytic activation electrode plate is as follows:

[0084] The direct current power supply of the first electrolysis assembly 1, the second electrolysis assembly 2, and the third electrolysis assembly 3 is turned on, and the wastewater inlet 42 enters the lower end of the inner cavity 41; air or ozone is introduced into the built-in pipe 52 according to the water quality to be treated;

[0085] For example, when the water quality to be treated is food production wastewater or papermaking production wastewater, air is introduced into the built-in pipe 52;

[0086] When the water quality to be treated is chemical or printing and dyeing production wastewater, ozone is introduced into the built-in pipe 52;

[0087] The wastewater at the lower end of the inner cavity 41 flows upward and sequentially passes through the first electrolysis assembly 1, the second electrolysis assembly 2, and the third electrolysis assembly 3, and then is discharged from the water outlet 43, and a portion of the wastewater enters the reflux pool 9 and is pumped into the reflux pipe 7 by the water pump 6. When the wastewater in the reflux pipe 7 passes through the first Venturi structure 71, it will suck in the external air to the second Venturi structure 72 and then suck in the wastewater to be treated. In this stage, the oxygen solubility in the water is increased, and a phased reflux is formed;

[0088] When the wastewater flows to the second gradually thickening pipe section 75, the wastewater near the inner wall of the second gradually thickening pipe section 75 appears to flow slowly, turbulence occurs, vortexes are formed, and a portion of the dissolved oxygen escapes therefrom to form small bubbles. The small bubbles are carried by the wastewater to the abrupt change pipe section 74 and are easily floated to the corner at the upper end of the abrupt change pipe section 74 and move upward from the communication hole 742 into the inner cavity 41 to increase the dissolved oxygen concentration at the electrolysis assembly, and then the wastewater in the reflux pipe 7 reaches the abrupt change pipe section 74.

[0089] The wastewater in the abrupt change pipe section 74 continues to flow downward to the first gradually thickening pipe section 73. Since the first gradually thickening pipe section 73 gradually thickens, turbulence occurs, vortexes are formed, and a portion of the dissolved oxygen escapes therefrom to form small bubbles, which eventually flow out from the bottom to the lower side of the first electrolysis assembly 1. This enables the electrolysis assembly to be periodically oxygenated, and enables hydrogen peroxide to be generated on the surface of the catalytically activated electrode plate 5, and the hydrogen peroxide reacts with the catalyst in the metal shavings to form hydroxyl radicals, which degrade the organic matter in the wastewater.

[0090] The manganese dioxide loaded on the porous layer body 53 as a catalyst can improve the utilization efficiency and reaction rate of ozone, making the ozone oxidation process more efficient and rapid. The manganese dioxide catalyst has good stability and a long service life, and is not easily destroyed or deactivated in the ozone catalytic oxidation process, and can continuously exert a catalytic effect. The manganese dioxide is a non-toxic and harmless catalyst, and is harmless to the environment and the human body. In the ozone catalytic oxidation process, the use of manganese dioxide does not cause secondary pollution and has good compatibility with the environment.

[0091] The above-described ideal embodiments according to the present application are for illustration, and through the above-described description, relevant personnel can make various changes and modifications without deviating from the technical concept of the present application. The technical scope of the present application is not limited to the contents of the specification, and must be determined by the scope of the claims.

Claims

1. A wastewater treatment device based on a catalytically activated electrode plate, characterized in that: include: Wastewater tower (4) has an inner cavity (41) for containing wastewater, with an inlet (42) at the lower end of the inner cavity (41) and a drain (43) at the upper end of the inner cavity (41). The multi-stage electrolysis unit has multiple electrolysis components arranged sequentially from bottom to top in the inner cavity (41). The height of the uppermost electrolysis component is lower than the height of the drain outlet (43). The electrolysis component includes positive and negative electrode plates that are spaced apart from each other. Both the positive and negative electrode plates are catalytic activation electrode plates (5). The catalytic activation electrode plate (5) has a metal substrate (51), an internal tube (52), and a porous layer (53) for catalytic oxidation of organic matter in wastewater. The porous layer (53) is provided on both the upper and lower surfaces of the metal substrate (51). The inlet of the internal tube (52) is located outside the wastewater tower (4), and the outlet of the internal tube (52) extends to the metal substrate (51). The fluid flowing out of the outlet of the internal tube (52) enters the inner cavity (41) through the porous layer (53). And an oxygen solubility increasing unit, having a water pump (6) and a return pipe (7), the inlet of the water pump (6) being connected to the area above the uppermost electrolysis component in the inner cavity (41), the outlet of the water pump (6) being connected to one end of the return pipe (7), the other end of the return pipe (7) extending downward into the inner cavity (41) and located below the lowermost electrolysis component, the portion of the return pipe (7) outside the inner cavity (41) having a first Venturi structure (71) for drawing in air. The porous layer (53) is made of metal and the surface of the porous layer (53) is loaded with manganese dioxide. The porous layer (53) has several channels. The fluid flowing out of the outlet of the built-in tube (52) enters the inner cavity (41) through the channels. At least a portion of the inner wall of the channels is loaded with catalyst particles. The metal substrate (51) has an air cavity (512) that communicates with the built-in tube (52). The inner wall of the air cavity (512) has a plurality of bubble holes (513). The porous layer (53) on the upper surface of the metal substrate (51) covers the bubble holes (513) on the upper surface of the metal substrate (51). The porous layer (53) on the lower surface of the metal substrate (51) covers the bubble holes (513) on the lower surface of the metal substrate (51).

2. The wastewater treatment device based on a catalytically activated electrode plate according to claim 1, characterized in that: The porous layer (53) is formed by pressing several metal shavings loaded with manganese dioxide, and the catalyst particles are sandwiched in the porous layer (53) by the metal shavings.

3. The wastewater treatment device based on a catalytically activated electrode plate according to claim 1, characterized in that: The upper surface of the metal substrate (51) has a plurality of flow holes (511) extending downward.

4. The wastewater treatment device based on a catalytically activated electrode plate according to claim 1, characterized in that: The multi-stage electrolysis unit has at least three electrolysis components, namely a primary electrolysis component (1), a secondary electrolysis component (2), and a tertiary electrolysis component (3). The primary electrolysis unit (1), the secondary electrolysis unit (2) and the tertiary electrolysis unit (3) are arranged sequentially from bottom to top in the inner cavity (41); The height of the first-stage electrolysis unit (1) is higher than the height of the inlet (42), and the height of the third-stage electrolysis unit (3) is lower than the height of the outlet (43).

5. The wastewater treatment device based on a catalytically activated electrode plate according to claim 1, characterized in that: The first Venturi structure (71) includes a first contraction tube section (711), a first throat section (712) and a first expansion tube section (713) located on the return tube (7) and connected downward along the axis of the return tube (7). The first throat section (712) is provided with an external air tube (7121). One end of the external air tube (7121) is connected to the first throat section (712), and the other end is connected to the outside.

6. The wastewater treatment device based on a catalytically activated electrode plate according to claim 5, characterized in that: The portion of the return pipe (7) located between the primary electrolysis assembly (1) and the secondary electrolysis assembly (2) in the inner cavity (41) has a second Venturi structure (72). The second Venturi structure (72) includes a second contraction tube section (721), a second throat section (722) and a second expansion tube section (723) located on the return tube (7) and connected downward in sequence along the axial direction of the return tube (7). The second Venturi structure (72) is covered with a perforated tube (8). A cavity (82) is formed between the inner wall of the perforated tube (8), the outer wall of the second contraction section (721), the outer wall of the second throat section (722), and the outer wall of the second expansion section (723). The outer peripheral wall of the perforated tube (8) has several perforated holes (81) communicating with the cavity (82). The inner wall of the second expansion section (723) has several inner holes (7231) communicating with the cavity (82).

7. The wastewater treatment device based on a catalytically activated electrode plate according to claim 5, characterized in that: The part of the return pipe (7) that passes through the primary electrolysis component (1) is the first variable diameter pipe section (73), and the part that passes through the secondary electrolysis component (2) is the second variable diameter pipe section (75). The cross-sectional area of ​​the first variable diameter pipe section (73) and the cross-sectional area of ​​the second variable diameter pipe section (75) gradually increase from top to bottom. The reflux pipe (7) has a sudden change pipe section (74) located between the primary electrolysis component (1) and the secondary electrolysis component (2), with the upper end being larger than the lower end. The upper end face of the sudden change pipe section (74) has an upper pipe opening (741) and a connecting hole (742). The upper pipe opening (741) is connected to the lower end of the second variable diameter pipe section (75). The connecting hole (742) is located outside the upper pipe opening (741) and is connected to the inner cavity (41) and the sudden change pipe section (74) respectively. The lower end of the sudden change pipe section (74) is connected to the upper end of the first variable diameter pipe section (73). The maximum cross-sectional area of ​​the upper end of the sudden change pipe section (74) is greater than the maximum cross-sectional area of ​​the lower end of the second variable diameter pipe section (75).

8. The wastewater treatment device based on a catalytically activated electrode plate according to claim 1, characterized in that: The wastewater tower (4) is provided with a reflux pool (9) at its upper end. The inner cavity (41) is connected to the reflux pool (9) through the reflux port. The height of the reflux port is lower than the height of the drain outlet (43). The water pump (6) is installed in the reflux pool (9).

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