An integrated electrocatalytic oxidation device

Abstract

An integrated electrocatalytic oxidation device belongs to the technical field of sewage deep treatment. The device includes a water reservoir, a booster pump, a reactor cleaning device, a tubular electrocatalytic oxidation reactor, a pressure controller and a DC power supply. The reactor cleaning device and the pressure controller are both electrically connected to an external power supply. The output port of the water reservoir and the output port of the reactor cleaning device are both connected to the input port of the booster pump through a one-way valve. The device provided by the present invention solves the technical problems of poor liquid phase mass transfer and low pollutant removal efficiency in the electrocatalytic oxidation device in the prior art by setting a tubular electrocatalytic oxidation reactor.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage deep treatment, and in particular to an integrated electrocatalytic oxidation device. Background Art

[0002] With the development of pharmaceutical, pesticide, dye, fine chemical and other industries, the number and types of highly toxic and difficult-to-degrade organic matter in wastewater are increasing. Electrocatalytic oxidation, as a kind of advanced oxygen method, has gradually attracted everyone's attention in recent years due to its advantages such as high treatment efficiency, no secondary pollution, small facility footprint, and strong parameter controllability. The liquid phase mass transfer step is an important part of the entire electrocatalytic process, because the reaction particles in the liquid phase need to be continuously transported to the electrode surface through liquid phase mass transfer, and the electrode reaction products need to leave the electrode surface through the liquid phase mass transfer process. Only in this way can the electrode process be guaranteed to proceed continuously. The liquid phase mass transfer step may become the controlling step of the electrocatalytic process, which determines the characteristics of the kinetics of the entire electrocatalytic process.

[0003] The electrodes of traditional electrocatalytic oxidation devices use flat electrodes. The result of this flow configuration will lead to a large hydrodynamic diffuse boundary layer. On the surface of the electrode, the liquid phase mass transfer effect is poor, thereby preventing the rapid removal of pollutants. Therefore, electrocatalytic oxidation requires a large number of parallel flat electrodes to obtain sufficient specific surface area to remove pollutants and reduce concentration polarization. Therefore, improving mass transfer effect, increasing electrode utilization efficiency, and reducing reaction energy consumption are the key to electrocatalytic oxidation devices. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes an integrated electrocatalytic oxidation device, which solves the technical problems of poor liquid phase mass transfer and low pollutant removal efficiency in the electrocatalytic oxidation device in the prior art by setting up a tubular electrocatalytic oxidation reactor.

[0005] The present invention provides an integrated electrocatalytic oxidation device, comprising a water reservoir, a booster pump, a reactor cleaning device, a tubular electrocatalytic oxidation reactor, a pressure controller and a DC power supply, wherein the reactor cleaning device and the pressure controller are both electrically connected to an external power supply, and the output port of the water reservoir and the output port of the reactor cleaning device are both connected to the input port of the booster pump through a one-way valve;

[0006] The tubular electrocatalytic oxidation reactor comprises a reactor shell, a stainless steel cathode, and a tubular membrane electrode. The reactor shell consists of three parts: a left part, a middle part, and a right part, and the reactor shell as a whole is a cylinder. A water inlet is provided at the bottom of the left part of the reactor shell, and the water inlet is connected to the output port of a booster pump through a pipeline. A reflux liquid outlet and a permeate water outlet are respectively provided at the top of the right part and the top of the middle part of the reactor shell, and the reflux liquid outlet and the water inlet are centrally symmetrical about the center position of the reactor shell. The output port of the reflux liquid outlet is connected to the input port of a water reservoir through a pressure controller. The permeate water outlet is connected to the input port of a water reservoir through a pressure controller. The output port of the reactor shell is directly connected to the input port of the water storage tank, a carbon felt cathode is pasted around the inner wall in the middle of the reactor shell, a tubular membrane electrode is provided at the center of the inner wall of the reactor shell, a stainless steel cathode is horizontally inserted at the center of the inner wall of the tubular membrane electrode, a stainless steel sheet is inserted between the middle and right parts of the reactor shell, and the tubular membrane electrode is electrically connected to the positive terminal of the DC power supply through the stainless steel sheet, and the stainless steel cathode is electrically connected to the negative terminal of the DC power supply, a conductive screw is screwed on the bottom of the outer wall of the reactor shell, and the conductive screw is tightly fitted with the carbon felt cathode, and the carbon felt cathode is electrically connected to the DC power supply through the conductive screw.

[0007] As a further improvement of the present invention, an air aerator is fixedly installed at the bottom of the water storage tank, and the air aerator is electrically connected to an external power supply.

[0008] As a further improvement of the present invention, the stainless steel sheet is located between the middle and right parts of the reactor, one side of which is connected to the tubular membrane electrode, and the other side of which is electrically connected to the positive terminal of the DC power supply through a wire.

[0009] As a further improvement of the present invention, the tubular membrane electrode is an anode tubular membrane electrode, and the average pore size of the tubular membrane electrode is 1-3 microns, the pore structure is developed, the pore ratio accounts for 20%-40%, and the sealing holes at both ends of the tubular membrane electrode are 1-2 centimeters.

[0010] As a further improvement of the present invention, the stainless steel cathode is a 316 type non-magnetic steel rod.

[0011] As a further improvement of the present invention, the portion of the stainless steel sheet connected to the tubular membrane electrode is coated with vaseline.

[0012] As a further improvement of the present invention, the shell of the reactor is made of organic glass, and the interface of the shell of the reactor is screwed and adhered with a sealing rubber pad.

[0013] As a further improvement of the present invention, the reactor cleaning device includes a clean water chamber and an ethanol chamber.

[0014] Beneficial effects: The present invention achieves stirring and oxygenation by installing an air aerator at the bottom of the water storage chamber, so that the carbon felt cathode can use oxygen to generate H2O2 oxidant in situ, and the present invention uses a tubular membrane electrode as an anode and utilizes a cross-flow filtration flow state, thereby greatly increasing the utilization area of ​​the electrocatalytic oxidation anode, while reducing energy consumption and improving the efficiency of the reaction treatment. The booster pump in the present invention will give a certain pressure to the incoming water flow, so that the membrane electrode is subjected to a normal force perpendicular to the membrane and a tangential force parallel to the membrane. The normal force allows water molecules to pass through the membrane, and the tangential force allows the water flow to flush away the retained substances on the membrane, and the permeability of the membrane can be restored. By controlling the pressure controller of the water outlet, the magnitude of the two forces is controlled so that the tubular membrane electrode maintains a certain permeability. At the same time, the reactor cleaning device installed in the present invention can clean the equipment and extend the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the integrated electrocatalytic oxidation device provided by the present invention;

[0016] Figure 2 It is a schematic structural diagram of a tubular electrocatalytic oxidation reactor in the integrated electrocatalytic oxidation device provided by the present invention.

[0017] In the figure: 1 is a water storage tank, 2 is an air aerator, 3 is a booster pump, 4 is a reactor cleaning device, 5 is a tubular electrocatalytic oxidation reactor, 501 is a reactor shell, 6 is a screw, 7 is a water inlet, 8 is a stainless steel cathode, 9 is a carbon felt cathode, 10 is a tubular membrane electrode, 11 is a pressure controller, 12 is a stainless steel sheet, 13 is a reflux liquid outlet, 14 is a permeate water outlet, 15 is a DC power supply, and 16 is a conductive screw. DETAILED DESCRIPTION

[0018] In order to further illustrate the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and embodiments, but they should not be understood as limiting the scope of protection of the present invention. In order to further illustrate the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and embodiments, but they should not be understood as limiting the scope of protection of the present invention.

[0019] Example: Figure 1 As shown, the present invention provides an integrated electrocatalytic oxidation device, including a water reservoir 1, a booster pump 3, a reactor cleaning device 4, a tubular electrocatalytic oxidation reactor 5, a pressure controller 11 and a DC power supply 15, the reactor cleaning device 4 and the pressure controller 11 are both electrically connected to an external power supply, and the output port of the water reservoir 1 and the output port of the reactor cleaning device 4 are both connected to the input port of the booster pump 3 through a one-way valve;

[0020] like Figure 2As shown, the tubular electrocatalytic oxidation reactor 5 includes a reactor shell 501, a stainless steel cathode 8, and a tubular membrane electrode 10. The reactor shell 501 is composed of three parts: a left part, a middle part, and a right part, and the reactor shell 501 is a cylindrical body as a whole. A water inlet 7 is provided on the left part of the reactor shell 501, and the water inlet 7 is connected to the output port of the booster pump 3 through a pipeline. Water flows from the water inlet 7 to the inside of the tubular electrocatalytic oxidation reactor 5 through the booster pump 3. The top of the right part and the top of the middle part of the reactor shell 501 are respectively provided with a reflux liquid outlet 13 and a permeate outlet 14. The outlet 14 of the reactor shell 501 is centrally symmetrical with the water inlet 7, and the water flowing out of the permeate outlet 14 is the water that permeates the tubular membrane. The output port of the reflux outlet 13 is connected to the input port of the water reservoir 1 through the pressure controller 11, and the water flows back to the water reservoir 1 from the reflux outlet 13. The output port of the permeate outlet 14 is directly connected to the input port of the water reservoir 1, and the water flows back to the water reservoir 1 from the permeate outlet 14. The inner wall of the middle part of the reactor shell 501 is pasted with carbon felt with a specific surface area of ​​10 mm thick. The cathode 9 realizes full utilization of the effective area of ​​the carbon felt cathode 9, and the oxygen in the water will produce H2O2 on the surface of the carbon felt cathode 9. A tubular membrane electrode 10 is provided at the center of the inner wall of the reactor shell 501, and a stainless steel cathode 8 is horizontally inserted at the center of the inner wall of the tubular membrane electrode 10. A stainless steel sheet 12 is inserted between the middle and right parts of the reactor shell 501, and the tubular membrane electrode 10 is electrically connected to the positive terminal of the DC power supply 15 through the stainless steel sheet 12, and the stainless steel cathode 8 is electrically connected to the negative terminal of the DC power supply 15. The bottom screw of the outer wall of the reactor shell 501 A conductive screw 16 is connected, and the conductive screw 16 is tightly fitted with the carbon felt cathode 9. The carbon felt cathode 9 is electrically connected to the DC power supply 15 through the conductive screw 16. When the booster pump 3 gives a certain pressure value, the water flow generates two forces on the surface of the tubular membrane electrode 10. One is the normal force perpendicular to the tubular membrane electrode 10, so that water molecules pass through the membrane, and the other is the tangential force parallel to the tubular membrane electrode 10, so that the water flow flushes the intercepted materials on the membrane. At the same time, the pressure controller 11 controls the flow ratio of the reflux liquid outlet 13 and the permeate outlet 14 to achieve better flushing of the tubular membrane electrode 10.

[0021] As a further improvement of the present invention, an air aerator 2 is fixedly installed at the bottom of the water storage tank 1, and the air aerator 2 is electrically connected to an external power supply. The air aerator 2 can blow air into the water body to increase the flow of the water body, thereby achieving oxygenation and stirring in the water body.

[0022] As a further improvement of the present invention, the stainless steel sheet is located between the middle and right parts of the reactor, one side of which is connected to the tubular membrane electrode, and the other side of which is electrically connected to the positive terminal of the DC power supply 15 through a wire.

[0023] As a further improvement of the present invention, the tubular membrane electrode 10 is an anode tubular membrane electrode 10, and the average pore size of the tubular membrane electrode 10 is 2 microns, the pore structure is developed and the pore ratio is 30%, and the sealing holes at both ends of the tubular membrane electrode 10 are 1.5 centimeters. The tubular membrane electrode 10 can realize the coupling of electrocatalysis and membrane action, so that the water quality of sewage permeating through the tubular membrane electrode 10 is greatly improved.

[0024] As a further improvement of the present invention, the stainless steel cathode 8 is a 316 type non-magnetic steel rod.

[0025] As a further improvement of the present invention, the portion of the stainless steel sheet connected to the tubular membrane electrode is coated with vaseline, thereby preventing the anode of the tubular membrane electrode 10 from contacting water and causing corrosion of the conductive medium.

[0026] As a further improvement of the present invention, the material of the reactor shell 501 is organic glass, and the interface of the reactor shell 501 is screwed by screws 6 and is pasted with a sealing pad.

[0027] As a further improvement of the present invention, the reactor cleaning device 4 includes a clean water chamber and an ethanol chamber. After the reaction is completed, a certain amount of clean water and ethanol in the reactor cleaning device 4 cleans the reactor, which can achieve self-cleaning of the device and extend the service life of the reactor.

[0028] Working principle: When the present invention is working, first connect the external power supply. During the reaction process, the air aerator 2 increases the flow of the water by blowing air into the water in the water reservoir 1, and stirs and oxygenates the water. At the same time, the booster pump 3 absorbs the water inside the water reservoir 1 into the tubular electrocatalytic oxidation reactor 5 through the water inlet 7, so that the tubular membrane electrode 10 is simultaneously subjected to a normal force perpendicular to the membrane and a tangential force parallel to the membrane. The normal force allows water molecules to pass through the tubular membrane electrode 10, and the tangential force allows the water flow to flush out the intercepted materials on the tubular membrane electrode 10, so that the permeability of the tubular membrane electrode 10 can be restored. By controlling the pressure controller 11 of the water outlet, the magnitude of the two forces is controlled, so that the tubular membrane electrode maintains a certain permeability. The carbon felt cathode 9 uses oxygen to generate H2O2 oxidant in situ. At the same time, the tubular membrane electrode 10 acts as an anode and uses the cross-flow filtration flow state to greatly increase the utilization area of ​​the electrocatalytic oxidation anode, thereby reducing energy consumption and improving the efficiency of the reaction treatment. After the reaction is finished, the clean water chamber and the ethanol chamber in the reactor cleaning device 4 repeatedly clean the tubular electrocatalytic oxidation reactor 5, thereby improving the cleaning efficiency of the device.

[0029] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An integrated electrocatalytic oxidation device, characterized in that: It comprises a water reservoir (1), a booster pump (3), a reactor cleaning device (4), a tubular electrocatalytic oxidation reactor (5), a pressure controller (11) and a DC power supply (15), wherein the reactor cleaning device (4) and the pressure controller (11) are both electrically connected to an external power supply, and the output port of the water reservoir (1) and the output port of the reactor cleaning device (4) are both connected to the input port of the booster pump (3) via a one-way valve; The tubular electrocatalytic oxidation reactor (5) comprises a reactor shell (501), a stainless steel cathode (8), and a tubular membrane electrode (10). The reactor shell (501) consists of three parts: a left part, a middle part, and a right part. The reactor shell (501) is cylindrical as a whole. A water inlet (7) is provided at the bottom of the left part of the reactor shell (501), and the water inlet (7) is connected to the output port of the booster pump (3) through a pipeline. The top of the right part and the top of the middle part of the reactor shell (501) are respectively provided with a reflux liquid outlet (13) and a The permeate outlet (14) is provided, and the reflux liquid outlet (13) and the water inlet (7) are centrally symmetrical about the center position of the reactor shell (501); the output port of the reflux liquid outlet (13) is connected to the input port of the water reservoir (1) through a pressure controller (11); the output port of the permeate outlet (14) is directly connected to the input port of the water reservoir (1); a carbon felt cathode (9) is adhered around the inner wall of the middle part of the reactor shell (501); and a tubular membrane electrode is provided at the center position of the inner wall of the reactor shell (501). The reactor shell (501) is provided with a conductive screw (16) which is screwed to the bottom of the outer wall of the reactor shell (501), and the conductive screw (16) is tightly fitted to the carbon felt cathode (9). The carbon felt cathode (9) is electrically connected to a DC power supply (15) via a conductive screw (16); an air aerator (2) is fixedly installed at the bottom of the water storage tank (1), and the air aerator (2) is electrically connected to an external power supply; the tubular membrane electrode (10) is an anode tubular membrane electrode (10), and the average pore size of the tubular membrane electrode (10) is 1-3 microns, the pore structure is well developed, and the pore ratio is 20%-40%, and the sealing holes at both ends of the tubular membrane electrode (10) are 1-2 centimeters; the reactor cleaning device (4) includes a clean water chamber and an ethanol chamber.

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