Electrocatalytic oxidation degradation precision treatment device

Abstract

The invention relates to an electrocatalytic oxidation degradation fine treatment device, and relates to the technical field of sewage treatment. The electrocatalytic oxidation degradation fine treatment device comprises a wastewater unit, a water production unit and an electrocatalytic oxidation module, the electrocatalytic oxidation module comprises an anode plate, an anode catalyst partition plate, a cation membrane, a cathode catalyst partition plate and a cathode plate which are arranged in sequence, and the anode plate and the cathode plate are connected with an electric power unit. The anode catalyst partition plate and the cathode catalyst partition plate are in fluid communication, an inlet of the anode catalyst partition plate is connected with the wastewater unit, an outlet of the cathode catalyst partition plate is connected with the water production unit, an anode chamber catalyst chamber is arranged in the anode catalyst partition plate, and a cathode chamber catalyst chamber is arranged in the cathode catalyst partition plate. A cathode catalyst chamber is arranged in the cathode catalyst partition plate; and the anode catalyst chamber and the cathode catalyst chamber are respectively filled with catalyst fillers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to an electro-catalytic oxidation degradation polishing device. BACKGROUND

[0002] Industrial wastewater contains not only high concentration of salt substances, but also high concentration of organic matter. Chemical oxygen demand (COD) is often used as an index to measure the content of organic matter in water. The so-called chemical oxygen demand (COD) refers to the amount of oxidizing agent consumed when a water sample is treated with a certain strong oxidizing agent under certain conditions, which is an index to measure the amount of reducing substances in water.

[0003] At present, it is difficult to use conventional biochemical methods to treat low-concentration COD wastewater, and the use of advanced oxidation methods for treatment has problems such as high operating cost and high investment (such as ozone method). For example, municipal wastewater treatment, water reuse, and treatment of wastewater containing high-concentration organic matter. The treatment efficiency and power consumption of the existing electro-catalytic oxidation reactor for treating industrial wastewater need to be further improved. SUMMARY

[0004] The present application provides an electro-catalytic oxidation degradation polishing device to solve at least one of the above technical problems.

[0005] The present application provides an electro-catalytic oxidation degradation polishing device, comprising a wastewater unit, a water production unit, and an electro-catalytic oxidation module, the electro-catalytic oxidation module comprising an anode plate, an anode catalyst partition plate, a cation membrane, a cathode catalyst partition plate, and a cathode plate arranged in sequence, the anode plate and the cathode plate being connected to an electric power unit, the inlet of the anode catalyst partition plate being connected to the wastewater unit, the outlet of the anode catalyst partition plate and the inlet of the cathode catalyst partition plate being connected by a connecting pipeline, and the outlet of the cathode catalyst partition plate being connected to the water production unit.

[0006] In the anode catalyst partition plate and / or the cathode catalyst partition plate, a catalyst filler is filled.

[0007] In one embodiment, the catalyst filler comprises a carrier loaded with a catalyst, the carrier being spherical alumina, and the catalyst being manganese dioxide, iron, or copper.

[0008] In one embodiment, the anode catalyst partition plate is further provided with an anode catalyst flow channel, the anode catalyst flow channel comprising an anode catalyst main flow channel, the inlet of the anode catalyst main flow channel being connected to the wastewater unit, and the anode catalyst main flow channel being connected to the anode catalyst chamber, so that the wastewater in the wastewater unit enters the anode catalyst chamber through the anode catalyst main flow channel.

[0009] The cathode catalyst flow channel comprises a cathode catalyst main flow channel, and an outlet of the cathode catalyst main flow channel is connected with the water production unit, and the cathode catalyst main flow channel is communicated with the cathode catalyst chamber, and water produced in the cathode catalyst chamber enters the water production unit through the cathode catalyst main flow channel.

[0010] The outlet of the anode catalyst main flow channel and the inlet of the cathode catalyst main flow channel are communicated through the connecting pipeline.

[0011] In one embodiment, the anode catalyst main flow channel comprises a first main flow channel and a second main flow channel respectively located at the upper part and the lower part of the anode catalyst separator, and the cathode catalyst main flow channel comprises a third main flow channel and a fourth main flow channel respectively located at the upper part and the lower part of the cathode catalyst separator.

[0012] The inlet of the second main flow channel is connected with the waste water unit, the outlet of the first main flow channel is connected with the inlet of the fourth main flow channel, and the third main flow channel is connected with the water production unit.

[0013] In one embodiment, the anode catalyst flow channel comprises a plurality of anode catalyst branch flow channels, each of which is communicated with the anode catalyst main flow channel, and each of which is communicated with the anode catalyst chamber, and the waste water in the waste water unit enters the anode catalyst chamber through the anode catalyst main flow channel and the plurality of anode catalyst branch flow channels.

[0014] In one embodiment, the cathode catalyst flow channel comprises a plurality of cathode catalyst branch flow channels, each of which is communicated with the cathode catalyst main flow channel, and each of which is communicated with the cathode catalyst chamber, and the water produced in the cathode catalyst chamber enters the water production unit through the plurality of cathode catalyst branch flow channels and the cathode catalyst main flow channel.

[0015] In one embodiment, the materials of the anode plate and the cathode plate are the same, and both are made of titanium plate coated with a noble metal coating, and the noble metal is ruthenium or iridium.

[0016] In one embodiment, a protective net is arranged between the cation membrane and the anode catalyst separator and between the cation membrane and the cathode catalyst separator, and a gasket and a separator net are arranged on the side of the anode catalyst separator away from the cation membrane and on the side of the cathode catalyst separator away from the cation membrane.

[0017] In one embodiment, the electro-catalytic oxidation module further comprises an anode end plate and a cathode end plate, the anode end plate is located at the side of the anode catalyst separator far away from the cation membrane, the cathode end plate is located at the side of the cathode catalyst separator far away from the cation membrane, and the side of the anode end plate close to the anode catalyst separator and the side of the cathode end plate close to the cathode catalyst separator are respectively provided with a gasket.

[0018] In one embodiment, the anode catalyst separator is not filled with catalyst filler, and the cathode catalyst separator is filled with catalyst filler, and the water inlet end of the connecting pipeline close to the cathode catalyst separator is further connected with a pH value adjusting device.

[0019] Compared with the prior art, the advantages of the present application are that by arranging catalyst fillers in the anode chamber catalyst chamber and the cathode chamber catalyst chamber, the COD in the wastewater can be efficiently oxidized and degraded by the hydroxyl generated by the anode plate under the action of the catalyst when the wastewater flows through the anode chamber catalyst chamber filled with catalyst fillers, and oxygen is generated in the anode chamber defined by the anode catalyst separator and the cation membrane; when the wastewater flows through the cathode chamber catalyst chamber filled with catalyst fillers, the oxygen generated in the anode chamber is brought into the cathode chamber defined by the cation membrane and the cathode catalyst separator, and the oxygen is reduced to produce hydrogen peroxide under the action of the catalyst coated on the cathode plate in the cathode chamber, and the hydrogen peroxide and the COD in the wastewater are efficiently oxidized and degraded under the action of the catalyst in the cathode chamber catalyst chamber, so that the undegraded organic matter is further oxidized and degraded, thereby greatly improving the removal rate of the COD in the wastewater. In the present application, by filling the catalyst fillers in the anode catalyst separator and the cathode catalyst separator, the removal rate of the COD can reach more than 90%. BRIEF DESCRIPTION OF DRAWINGS

[0020] Hereinafter, the present application will be described in more detail based on examples and with reference to the accompanying drawings.

[0021] Figure 1 is a structural schematic view of an electro-catalytic oxidation degradation fine treatment device in an embodiment of the present application;

[0022] Figure 2 is Figure 1 a structural schematic view of an electro-catalytic oxidation module in the present application;

[0023] Figure 3 is Figure 2 a front view of an anode end plate in the present application;

[0024] Figure 4 is Figure 2 a front view of a cathode end plate in the present application;

[0025] Figure 5 is Figure 2Front view of the middle anode catalyst baffle;

[0026] Figure 6 is Figure 2 Side view of the middle anode catalyst baffle;

[0027] Figure 7 is Figure 2 Front view of the middle cathode catalyst baffle;

[0028] Figure 8 is Figure 2 Side view of the middle cathode catalyst baffle.

[0029] Reference signs:

[0030] 100, wastewater unit; 200, water production unit; 300, electro-catalytic oxidation module; 400, power unit;

[0031] 101, wastewater pump;

[0032] 301, anode end plate; 302, gasket; 303, anode plate; 304, separator net; 305, anode catalyst baffle; 306, protection net; 307, cation membrane; 308, cathode catalyst baffle; 309, cathode plate; 310, cathode end plate; 311, connecting pipeline; 312, catalyst filling;

[0033] 3031, anode plate terminal; 3091, cathode plate terminal;

[0034] 3051, anode chamber catalyst chamber; 3052, anode catalyst flow channel; 3053, anode catalyst main flow channel; 3054, anode catalyst branch flow channel;

[0035] 3081, cathode chamber catalyst chamber; 3082, cathode catalyst flow channel; 3083, cathode catalyst main flow channel; 3084, cathode catalyst branch flow channel. DETAILED DESCRIPTION

[0036] The application will be further described below in conjunction with the drawings.

[0037] As shown in Figure 1 and Figure 2 , the application provides an electro-catalytic oxidation degradation polishing device, which comprises a wastewater unit 100, a water production unit 200, an electro-catalytic oxidation module 300 and a power unit 400. As shown in Figure 2As shown, the electro-catalytic oxidation module 300 comprises an anode plate 303, an anode catalyst partition 305, a cation membrane 307, a cathode catalyst partition 308 and a cathode plate 309 arranged in sequence, the anode plate 303 and the cathode plate 309 are connected with the power unit 400 respectively, the inlet of the anode catalyst partition 305 is connected with the wastewater unit 100, the outlet of the anode catalyst partition 305 and the inlet of the cathode catalyst partition 308 are in fluid communication through a connecting pipeline 311, and the outlet of the cathode catalyst partition 308 is connected with the water production unit 200.

[0038] The anode catalyst partition 305 and / or the cathode catalyst partition 308 are filled with catalyst fillers 312.

[0039] In one embodiment, the anode catalyst partition 305 and the cathode catalyst partition 308 are both filled with catalyst fillers 312. As shown, Figure 2 The anode catalyst partition 305 is provided with an anode chamber catalyst chamber 3051, and the cathode catalyst partition 308 is provided with a cathode chamber catalyst chamber 3081, and the anode chamber catalyst chamber 3051 and the cathode chamber catalyst chamber 3081 are respectively filled with catalyst fillers 312.

[0040] In addition, the catalyst fillers 312 in the anode chamber catalyst chamber 3051 occupy at least 90% of the volume of the anode chamber catalyst chamber 3051, and the catalyst fillers 312 in the cathode chamber catalyst chamber 3081 occupy at least 90% of the volume of the cathode chamber catalyst chamber 3081.

[0041] In one embodiment, the anode catalyst partition 305 is not filled with catalyst fillers 312, and the cathode catalyst partition 308 is filled with catalyst fillers 312. For example, the anode catalyst partition 305 can not be provided with an anode chamber catalyst chamber 3051, so as not to be filled with catalyst fillers 312, or the anode catalyst partition 305 is provided with an anode chamber catalyst chamber 3051, but the anode chamber catalyst chamber 3051 is not filled with catalyst fillers 312. And the cathode catalyst partition 308 is provided with a cathode chamber catalyst chamber 3081, and the cathode chamber catalyst chamber 3081 is filled with catalyst fillers 312. Among them, the catalyst fillers 312 in the cathode chamber catalyst chamber 3081 occupy at least 90% of the volume of the cathode chamber catalyst chamber 3081.

[0042] The anode chamber catalyst chamber 3051 can be a chamber / slot extending along the depth direction of the surface (e.g. the first surface) of the anode catalyst partition 305. For example, the thickness of the anode catalyst partition 305 is 3mm or more, which is used to accommodate the catalyst fillers 312. That is, the anode chamber catalyst chamber 3051 is a chamber / slot extending through the thickness direction of the anode catalyst partition 305.

[0043] As shown, Figure 5As shown, preferably, the catalyst packing 312 in the cation chamber catalyst chamber 3051 occupies more than 90% of the volume of the cation chamber catalyst chamber 3051, that is, the cation chamber catalyst chamber 3051 is filled or substantially filled by the catalyst packing 312.

[0044] Similarly, the cathode catalyst chamber 3081 can be a chamber / tank extending along its depth direction on the surface (e.g., its first surface) of the cathode catalyst separator 308. For example, the cathode catalyst separator 308 has a thickness of 3 mm or more and is used to accommodate the catalyst packing 312. That is, the cathode catalyst chamber 3081 is a chamber / tank extending through the thickness direction of the anode catalyst separator 305.

[0045] like Figure 7 As shown, preferably, the catalyst packing 312 in the anion catalyst chamber 3081 occupies more than 90% of the volume of the anion catalyst chamber 3081, that is, the anion catalyst chamber 3081 is filled or substantially filled by the catalyst packing 312.

[0046] A protective mesh 306 and a cation exchange membrane 307 are sequentially disposed between the anode catalyst separator 305 and the cathode catalyst separator 308. The surface of the anode catalyst separator 305 where the cation chamber catalyst chamber 3051 is disposed (e.g., its first surface) and the surface of the cathode catalyst separator 308 where the anion chamber catalyst chamber 3081 is disposed (e.g., its first surface) are disposed back-to-back with each other, that is, both the cation chamber catalyst chamber 3051 and the anion chamber catalyst chamber 3081 are away from the cation exchange membrane 307.

[0047] One protective mesh 306 is located between the anode catalyst separator 305 and the cation exchange membrane 307, and the other protective mesh 306 is located between the cathode catalyst separator 308 and the cation exchange membrane 307. Therefore, the protective mesh 306 can protect the cation exchange membrane 307 to prevent it from being scratched by particles in the catalyst packing 312.

[0048] A cation exchange membrane 307 is located between two protective barriers 306 and is constructed as a membrane structure capable of selectively permeating cations. The anode catalyst separator 305 and the cation exchange membrane 307 define the cation chamber, while the cation exchange membrane 307 and the cathode catalyst separator 308 define the anion chamber. Therefore, the cations (H+) in the cation chamber... + It can pass through the cation membrane 307 and enter the anion chamber.

[0049] like Figure 5 and Figure 7 As shown, the catalyst packing 312 includes a support and a catalyst. The support is spherical alumina, and the catalyst is manganese dioxide, iron, or copper.

[0050] like Figure 5 and Figure 6As shown, the anode catalyst partition plate 305 is further provided with an anode catalyst flow channel 3052, which includes an anode catalyst main flow channel 3053 and a plurality of anode catalyst branch flow channels 3054. The inlet of the anode catalyst main flow channel 3053 is connected to the wastewater unit 100. Each of the anode catalyst branch flow channels 3054 is in communication with the anode catalyst main flow channel 3053 and the anode catalyst chamber 3051. The wastewater in the wastewater unit 100 flows into the anode catalyst chamber 3051 through the anode catalyst main flow channel 3053 and the plurality of anode catalyst branch flow channels 3054.

[0051] The anode catalyst main flow channel 3053 can be a groove formed on the side of the anode catalyst partition plate 305 (e.g., the side of the first face where the anode catalyst chamber 3051 is located).

[0052] The anode catalyst branch flow channels 3054 can be grooves extending in a direction perpendicular to the extension direction of the anode catalyst main flow channel 3053. The plurality of anode catalyst branch flow channels 3054 are arranged in sequence and at intervals in the extension direction of the anode catalyst main flow channel 3053, and are in communication with the anode catalyst main flow channel 3053 and the anode catalyst chamber 3051, respectively. Therefore, the fluid can flow through each of the anode catalyst branch flow channels 3054 through the anode catalyst main flow channel 3053 and into the anode catalyst chamber 3051.

[0053] As shown in Figure 5 and Figure 6 The anode catalyst main flow channel 3053 can include a first main flow channel formed near the upper side of the anode catalyst partition plate 305 and a second main flow channel formed near the lower side of the anode catalyst partition plate 305. Some of the anode catalyst branch flow channels 3054 are in communication with the first main flow channel near the upper side of the anode catalyst partition plate 305, and the others are in communication with the second main flow channel near the lower side of the anode catalyst partition plate 305.

[0054] As shown in Figure 7 and Figure 8 The cathode catalyst partition plate 308 is further provided with a cathode catalyst flow channel 3082, which includes a cathode catalyst main flow channel 3083 and a plurality of cathode catalyst branch flow channels 3084. The cathode catalyst main flow channel 3083 is connected to the water production unit 200. Each of the cathode catalyst branch flow channels 3084 is in communication with the cathode catalyst main flow channel 3083 and the cathode catalyst chamber 3081. The water produced in the cathode catalyst chamber 3081 flows into the water production unit 200 through the plurality of cathode catalyst branch flow channels 3084 and the outlet of the cathode catalyst main flow channel 3083.

[0055] The cathode catalyst main channel 3083 can be a groove opened on the side of the cathode catalyst partition 308 (e.g., the side of the first surface where the cathode catalyst chamber 3081 is located).

[0056] The cathode catalyst branch flow channel 3084 can be a tank extending in a direction perpendicular to the extension direction of the cathode catalyst main flow channel 3083. Multiple cathode catalyst branch flow channels 3084 are sequentially and spaced apart in the extension direction of the cathode catalyst main flow channel 3083, and are respectively connected to the cathode catalyst main flow channel 3083 and the cathode catalyst chamber 3081. Therefore, fluid can flow through the cathode catalyst main flow channel 3083, through each cathode catalyst branch flow channel 3084, and into the cathode catalyst chamber 3081.

[0057] like Figure 7 and Figure 8 As shown, the cathode catalyst main flow channel 3083 may include a third main flow channel located near the upper side of the cathode catalyst partition 308 and a fourth main flow channel located near the lower side of the cathode catalyst partition 308. A portion of each cathode catalyst branch flow channel 3084 communicates with the third main flow channel near the upper side of the cathode catalyst partition 308, and another portion communicates with the fourth main flow channel near the lower side of the cathode catalyst partition 308.

[0058] like Figure 1 , Figure 5 and Figure 7 As shown, the outlet of the anode catalyst main channel 3053 and the inlet of the cathode catalyst main channel 3083 are connected by a connecting pipe 311. Therefore, wastewater in wastewater unit 100 is pumped into the anode catalyst main channel 3053 in the anode catalyst partition 305 by wastewater pump 101, and flows into the anode catalyst chamber 3051 through each anode catalyst branch channel 3054, and then flows to the cathode catalyst chamber 3081 through the connecting pipe 311. The wastewater undergoes a reaction in the anode catalyst chamber 3051 and the cathode catalyst chamber 3081 to remove COD from the wastewater, and the product water after the reaction can be transported to the product water unit 200 by a product water pump.

[0059] More specifically, the outlet of the first main flow channel at the upper portion of the anode catalyst separator 305 is connected to the inlet of the fourth main flow channel at the lower portion of the cathode catalyst separator 308, the inlet of the second main flow channel at the lower portion of the anode catalyst separator 305 is connected to the wastewater unit 100, and the outlet of the third main flow channel at the upper portion of the cathode catalyst separator 308 is connected to the water production unit 200. That is, the upper outlet of the anode catalyst main flow channel 3053 and the lower inlet of the cathode catalyst main flow channel 3083 are connected by the connecting pipe 311, the wastewater unit 100 is connected to the lower inlet of the anode catalyst main flow channel 3053 by a pipe, and the upper inlet of the cathode catalyst main flow channel 3083 is connected to the water production unit 200 by a pipe. Therefore, the wastewater enters the anode catalyst main flow channel 3053 from the lower portion, and flows through the anode catalyst chamber 3051 from bottom to top via the anode catalyst branch flow channels 3054, so that the wastewater can react in the anode chamber under the action of the catalyst therein. Correspondingly, the water after the anode chamber reaction enters the cathode catalyst main flow channel 3083 from the upper outlet of the anode catalyst main flow channel 3053 and the lower inlet of the cathode catalyst main flow channel 3083, and flows through the cathode catalyst chamber 3081 from bottom to top via the cathode catalyst branch flow channels 3084, so that the water can react in the cathode chamber under the action of the catalyst therein. Therefore, the path of the wastewater flowing through the anode catalyst chamber 3051 and the cathode catalyst chamber 3081 can be increased, and the residence time in the anode catalyst chamber 3051 and the cathode catalyst chamber 3081 can be increased, so that the wastewater has sufficient reaction time in the anode chamber and the cathode chamber, thereby improving the removal rate of COD in the wastewater.

[0060] In the embodiment in which the anode catalyst separator 305 does not provide the anode catalyst chamber 3051, the thickness of the anode catalyst separator 305 can be correspondingly thinner, for example, the thickness can be 1 mm. And the corresponding anode catalyst branch flow channels 3054 can not be provided, but only the anode catalyst main flow channel 3053 is connected to the wastewater unit 100 and the fourth main flow channel at the lower portion of the cathode catalyst separator 308 respectively to realize the water inlet and outlet of the anode chamber.

[0061] The materials of the anode plate 303 and the cathode plate 309 are the same, for example, both are made of titanium plate coated with a noble metal coating. The noble metal can be, for example, ruthenium or iridium, or other noble metals.

[0062] As Figure 2As shown, the gasket 302 and the screen 304 are arranged on the side of the anode catalyst partition plate 305 away from the cation membrane 307, and on the side of the cathode catalyst partition plate 308 away from the cation membrane 307. In addition, the electro-catalytic oxidation module further comprises an anode end plate 301 and a cathode end plate 310, the anode end plate 301 is arranged on the side of the anode catalyst partition plate 305 away from the cation membrane 307, and the cathode end plate 310 is arranged on the side of the cathode catalyst partition plate 308 away from the cation membrane 307, and the gasket 302 is arranged on the side of the anode end plate 301 close to the anode catalyst partition plate 305 and on the side of the cathode end plate 310 close to the cathode catalyst partition plate 308.

[0063] That is, the electro-catalytic oxidation module is sequentially arranged with the anode end plate 301, the gasket 302 (first gasket), the anode plate 303, the screen 304 (first screen), the gasket 302 (second gasket), the anode catalyst partition plate 305, the protective screen 306 (first protective screen), the cation membrane 307, the protective screen 306 (second protective screen), the cathode catalyst partition plate 308, the gasket 302 (third gasket), the screen 304 (second screen), the cathode plate 309, the gasket 302 (fourth gasket), and the cathode end plate 310.

[0064] The gasket 302 can play a role of sealing connection. The gasket 302 on the side of the anode catalyst partition plate 305 abuts against the anode catalyst partition plate 305, so as to keep the catalyst filler 312 in the anode chamber catalyst chamber 3051. Similarly, the gasket 302 on the side of the cathode catalyst partition plate 308 abuts against the cathode catalyst partition plate 308, so as to keep the catalyst filler 312 in the cathode chamber catalyst chamber 3081.

[0065] Therefore, it can be known that the catalyst filler 312 is contained in the anode chamber catalyst chamber 3051 of the anode catalyst partition plate 305, the protective screen 306 is arranged on the side of the anode catalyst partition plate 305 close to the cation membrane 307, and the gasket 302 is arranged on the side of the anode catalyst partition plate 305 away from the cation membrane 307, so that the gasket 302 and the protective screen 306 can block the catalyst filler 312 in the anode chamber catalyst chamber 3051 from both sides of the anode catalyst partition plate 305; and the protective screen 306 is a mesh structure with mesh, so that the wastewater can be reacted in the anode chamber defined by the anode catalyst partition plate 305 and the cation membrane 307.

[0066] Similarly, the gasket 302 and the protective screen 306 on both sides of the cathode catalyst partition plate 308 can block the catalyst filler 312 in the cathode chamber catalyst chamber 3081 from both sides of the cathode catalyst partition plate 308, so that the wastewater can be reacted in the cathode chamber defined by the cathode catalyst partition plate 308 and the cation membrane 307.

[0067] Wherein, the anode plate 303 and the cathode plate 309 are connected with the positive and negative poles of the power unit 400, which can be a direct current power supply for example. As shown in the figure, two or more anode plate connecting posts 3031 are arranged on the anode plate 303, which are connected with the positive pole of the power unit 400. Figure 3 As shown in the figure, two or more cathode plate connecting posts 3091 are arranged on the cathode plate 309, which are connected with the negative pole of the power unit 400. Figure 4 As shown in the figure, two or more cathode plate connecting posts 3091 are arranged on the cathode plate 309, which are connected with the negative pole of the power unit 400.

[0068] The anode end plate 301 and the cathode end plate 310 are used to press-fit the above-mentioned components, which can be tightly pressed by connecting members penetrating through the above-mentioned components to form a sealed whole, so that the fluid can flow therein.

[0069] Therefore, it can be known that the anode catalyst separator 305 and the cation membrane 307 define an anode chamber for oxidation reaction, and the cation membrane 307 and the cathode catalyst separator 308 define a cathode chamber for reduction reaction.

[0070] After the anode plate 303 and the cathode plate 309 are connected with the direct current power supply, hydrogen can be generated in the cathode chamber, and oxygen and a large amount of hydroxyl radicals (·OH) can be generated in the anode chamber. The hydroxyl radicals have strong oxidizing property, and the bacteria and viruses in the waste water (such as medical waste water) can be killed by the hydroxyl oxidation. In addition, since the catalyst filler 312 is filled in the anode catalyst separator 305, the waste water is subjected to catalytic oxidation reaction at the interface of the anode plate 303 under the action of the catalyst, and the generated hydroxyl and the catalyst in the catalyst filler 312 synergistically act on the organic matter to continuously oxidize and decompose the organic matter, so that the organic matter is finally oxidized and decomposed into carbon dioxide and water, and the ammonia nitrogen and other substances are removed. The reaction formula in the anode chamber is 2H2O-2e - →2·OH+2H + .

[0071] The cations (H + ) in the anode chamber can pass through the cation membrane 307 into the cathode chamber, and the oxygen generated in the anode chamber is brought into the cathode chamber along with the waste water flowing through the connecting pipeline 311, and the oxygen is subjected to O2 reduction reaction to generate hydrogen peroxide (H2O2) or HO2- under the action of the catalyst coated on the cathode plate. The hydrogen peroxide and the COD in the waste water are subjected to efficient oxidation and degradation reaction under the action of the catalyst in the cathode catalyst chamber, so that the undegraded organic matter is further subjected to oxidation and degradation treatment.

[0072] Therefore, the oxygen generated in the anode chamber can flow from the anode chamber to the cathode chamber with the wastewater through the connecting pipeline 311, so that the reduction reaction can occur in the cathode chamber to generate hydrogen peroxide, thereby achieving the purpose of degrading COD. Therefore, the present application does not need to actively add oxygen to the cathode chamber, but uses the oxygen generated in the anode chamber directly, so that the treatment efficiency of the present application is higher and the cost is lower.

[0073] In the prior art, the anode chamber and the cathode chamber are separated by an ion exchange membrane in an electrolytic device such as an H-shaped electrolytic cell. Although such an electrolytic device has a relatively simple structure, it has the problem of limited mass transfer (especially the difficulty of oxygen diffusion to the cathode). By connecting the anode catalyst partition plate 305 and the cathode catalyst partition plate 308, the wastewater flowing from the anode catalyst partition plate 305 to the cathode catalyst partition plate 308 can carry the oxygen generated by the anode and flow to the cathode catalyst partition plate 308 together, and diffuse to the cathode catalyst chamber 3081 and the cathode chamber through the cathode catalyst main flow channel 3083 and the cathode catalyst branch flow channel 3084. Therefore, the present application can make the oxygen diffuse to the cathode chamber simply, conveniently and efficiently, so as to facilitate the efficient reaction in the cathode chamber.

[0074] In one specific embodiment, the wastewater unit 100 has a wastewater conductivity of 300 us / cm, a COD of 21 ppm, and an ammonia nitrogen concentration of 15 ppm. The wastewater unit 100 has an inlet flow of 250 l / h to the anode catalyst partition plate 305, and after the wastewater flows into the anode catalyst partition plate 305 (the area of the cation membrane 307 is 0.5 m 2 ), the anode plate 303 and the cathode plate 309 are connected to the positive and negative electrodes of the power unit 400 respectively, and when the voltage of the power unit 400 (direct current power supply) is 6V and the current is 3.8A, the COD of the outlet water of the anode chamber is 9.5ppm, and the ammonia nitrogen concentration is 7.2ppm; the COD of the outlet water of the cathode chamber is 0.0ppm, and the ammonia nitrogen concentration is only 1.2ppm, so the COD removal rate is 100%. In addition, in this embodiment, the power consumption per ton of water is about 0.09 degrees, so the power consumption can be greatly saved.

[0075] The process of treating wastewater by the electro-catalytic oxidation and degradation fine treatment device of the present application is as follows:

[0076] The anode plate 303 and the cathode plate 309 are connected to the positive and negative poles of a direct current power supply respectively, and the anode chamber generates hydroxyl and oxygen. The wastewater in the wastewater unit 100 is pumped into the anode catalyst partition plate 305 by the wastewater pump 101, and the wastewater is oxidized in the anode catalyst partition plate 305 and the anode chamber defined by the anion membrane 307, and the COD in the wastewater is efficiently oxidized and degraded by the hydroxyl under the action of the catalyst filler 312 in the anode catalyst partition plate 305, and the COD is oxidized and degraded into carbon dioxide and water, and the ammonia nitrogen and other substances are oxidized into nitrogen, and the wastewater flows through the anode chamber and enters the cathode chamber defined by the anion membrane 307 and the cathode catalyst partition plate 308 through the connecting pipeline 311, and the oxygen carried by the wastewater is reduced to generate hydrogen peroxide by reacting with water, and the hydrogen peroxide further degrades the COD by reacting with the catalyst filler 312 in the cathode catalyst partition plate 308 to obtain water meeting the requirements, and the water produced in the cathode catalyst partition plate 308 can be input into the water production unit 200.

[0077] In the embodiment in which the anode catalyst partition plate 305 is not filled with the catalyst filler 312 and the cathode catalyst partition plate 308 is filled with the catalyst filler 312, the pH adjusting device is further connected to the water inlet end of the cathode catalyst partition plate 308 on the connecting pipeline 311. The pH adjusting device can add acid or alkali to the cathode chamber to change the acid-base environment of the electrolyte in the cathode chamber. In this embodiment, the catalyst filler 312 includes a carrier and a catalyst, the carrier is spherical alumina, and the catalyst is manganese dioxide, iron or copper.

[0078] Because the reaction in the cathode chamber is essentially the process that oxygen obtains electrons on the surface of the cathode plate 309 to be reduced to generate hydrogen peroxide ion (HO2-) or hydrogen peroxide (H2O2). The reaction can be carried out by a two-electron pathway or a four-electron pathway.

[0079] For example, NaOH or KOH solution can be added to the cathode chamber to make the cathode chamber an alkaline environment. At this time, the reaction formula in the cathode chamber is a two-electron pathway (target reaction): O2+H2O+2e - →HO2-+OH-; or a four-electron pathway (competitive reaction): O2+2H2O+4e - →4OH-.

[0080] The two-electron oxygen reduction reaction is more advantageous in an alkaline medium, and the cathode chamber is in an alkaline environment, which can make the H2O2 generated in the cathode chamber relatively stable (in the form of HO2-) in the alkaline environment.

[0081] Or H2SO4 solution can also be added to the cathode chamber to make the cathode chamber an acidic environment. At this time, the reaction formula in the cathode chamber is a two-electron pathway (target reaction): O2+2H + +2e -→ H2O2; or four-electron pathway (competing reaction): O2+ 4H + + 4e - → 2H2O.

[0082] In an acidic environment, H2O2 can be directly produced, so the product does not need to be converted, and some catalysts are more stable in an acidic environment. However, the kinetics of the two-electron oxygen reduction reaction described above is usually slower, and the catalyst requirements are higher.

[0083] Alternatively, the cathode chamber can be in a neutral solution, for example, Na2SO4, KHCO3, etc. can be added to the cathode chamber, which is more friendly in application scenarios.

[0084] The noble metal catalyst (such as ruthenium, iridium, etc.) coated on the cathode plate 309 can greatly improve the two-electron O2 reduction reaction and maximize the inhibition of the four-electron pathway (water production). The oxygen generated when the wastewater flows through the anode chamber is taken into the cathode chamber together, and the reduction reaction occurs in the cathode chamber to generate hydrogen peroxide. The hydrogen peroxide reacts with the catalyst filler 312 in the cathode catalyst separator 308 to efficiently oxidize and degrade COD to obtain the required product water.

[0085] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the application, and equivalent components can be substituted therein. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrocatalytic oxidation degradation purification device, characterized in that, The device includes a wastewater treatment unit, a product water treatment unit, and an electrocatalytic oxidation module. The electrocatalytic oxidation module includes an anode plate, an anode catalyst separator, a cation exchange membrane, a cathode catalyst separator, and a cathode plate arranged sequentially. The anode plate and the cathode plate are respectively connected to a power supply unit. The inlet of the anode catalyst separator is connected to the wastewater treatment unit. The outlet of the anode catalyst separator and the inlet of the cathode catalyst separator are connected through a connecting pipe. The outlet of the cathode catalyst separator is connected to the product water treatment unit. The anode catalyst separator and / or the cathode catalyst separator are filled with catalyst packing material.

2. The electrocatalytic oxidation degradation purification device according to claim 1, characterized in that, The catalyst packing includes a support carrying the catalyst, wherein the support is spherical alumina, and the catalyst is manganese dioxide, iron, or copper.

3. The electrocatalytic oxidation degradation refining device according to claim 1 or 2, characterized in that, The anode catalyst partition is further provided with an anode catalyst chamber and an anode catalyst flow channel. The anode catalyst flow channel includes an anode catalyst main channel. The inlet of the anode catalyst main channel is connected to the wastewater unit, and the anode catalyst main channel is connected to the anode catalyst chamber. Wastewater in the wastewater unit enters the anode catalyst chamber through the anode catalyst main channel. The cathode catalyst partition is further provided with an anion catalyst chamber and a cathode catalyst flow channel. The cathode catalyst flow channel includes a cathode catalyst main channel. The outlet of the cathode catalyst main channel is connected to the water production unit, and the cathode catalyst main channel is connected to the anion catalyst chamber. The water generated in the anion catalyst chamber enters the water production unit through the cathode catalyst main channel. The outlet of the anode catalyst main channel and the inlet of the cathode catalyst main channel are connected through the connecting pipeline.

4. The electrocatalytic oxidation degradation purification device according to claim 2, characterized in that, The anode catalyst main channel includes a first main channel and a second main channel located at the upper and lower parts of the anode catalyst partition, respectively; the cathode catalyst main channel includes a third main channel and a fourth main channel located at the upper and lower parts of the cathode catalyst partition, respectively. The inlet of the second main channel is connected to the wastewater unit, the outlet of the first main channel is connected to the inlet of the fourth main channel, and the outlet of the third main channel is connected to the water production unit.

5. The electrocatalytic oxidation degradation purification device according to claim 3, characterized in that, The anode catalyst flow channel includes multiple anode catalyst branch flow channels, each of which is connected to the main anode catalyst flow channel and is also connected to the anode catalyst chamber. Wastewater in the wastewater unit enters the anode catalyst chamber via the main anode catalyst flow channel and the multiple anode catalyst branch flow channels.

6. The electrocatalytic oxidation degradation purification device according to claim 3, characterized in that, The cathode catalyst flow channel includes multiple cathode catalyst branch flow channels, each of which is connected to the cathode catalyst main flow channel, and each of which is connected to the anion catalyst chamber. Water generated in the anion catalyst chamber enters the water production unit through the multiple cathode catalyst branch flow channels and the cathode catalyst main flow channel.

7. The electrocatalytic oxidation degradation purification apparatus according to claim 1 or 2, characterized in that, The anode plate and the cathode plate are made of the same material, both of which are made of titanium plates coated with a precious metal, namely ruthenium or iridium.

8. The electrocatalytic oxidation degradation purification apparatus according to claim 1 or 2, characterized in that, Protective nets are respectively provided between the cation membrane and the anode catalyst separator, and between the cation membrane and the cathode catalyst separator. Gaskets and separators are provided on the side of the anode catalyst separator away from the cation membrane and on the side of the cathode catalyst separator away from the cation membrane.

9. The electrocatalytic oxidation degradation refining device according to claim 1 or 2, characterized in that, The electrocatalytic oxidation module further includes an anode plate and a cathode plate. The anode plate is located on the side of the anode catalyst separator away from the cation membrane, and the cathode plate is located on the side of the cathode catalyst separator away from the cation membrane. Gaskets are respectively provided on the side of the anode plate near the anode catalyst separator and the side of the cathode plate near the cathode catalyst separator.

10. The electrocatalytic oxidation degradation purification device according to claim 1, characterized in that, When the anode catalyst partition is not filled with catalyst filler and the cathode catalyst partition is filled with catalyst filler, a pH adjustment device is also connected to the water inlet end of the connecting pipe near the cathode catalyst partition.

Images