A dual-cathode coupled electrocatalytic antibiotic wastewater treatment device

Abstract

This utility model relates to the field of wastewater treatment technology and discloses a dual-cathode coupled electrocatalytic antibiotic wastewater treatment device. The device includes a first electrolytic cell, a second electrolytic cell, a wastewater container, a purification container, and a power supply. The first electrolytic cell is equipped with an MMO electrode and a CB-PTFE / GF cracked electrode electrically connected to the power supply. The second electrolytic cell is equipped with a BDD electrode and a FeOCl / GF composite electrode electrically connected to the power supply. The first electrolytic cell has a first inlet and a first outlet connected to the wastewater container. The second electrolytic cell has a second outlet and a second inlet connected to the purification container. The first outlet is connected to the second inlet. This device is simple, produces no secondary pollution, requires no auxiliary devices, and can efficiently degrade antibiotic wastewater, achieving a removal rate of up to 80% for oxytetracycline, levofloxacin, and sulfamethoxazole.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a dual-cathode coupled electrocatalytic antibiotic wastewater treatment device. Background Technology

[0002] Advanced oxidation technologies are a supplementary wastewater treatment technology to traditional biological processes. They are often used to degrade persistent organic pollutants that are difficult to degrade biologically, such as the Fenton reaction, which utilizes Fe... 2+ H2O2 reacts with Fe under acidic conditions to generate highly oxidizing free radicals HO·, which indirectly oxidize recalcitrant pollutants in water. However, this technology has drawbacks such as the flammability and explosiveness of H2O2 during transport, its susceptibility to light and heat decomposition, and its limited pH range. Therefore, those skilled in the art have disclosed electro-Fenton technology, which generates H2O2 through in-situ electrocatalysis at the cathode, and can also simultaneously convert Fe... 3+ In-situ reduction to Fe 2 + , making Fe 3+ It can be recycled and regenerated. Compared with homogeneous reactions, heterogeneous electro-Fenton systems can catalyze the production of HO· from H2O2 at higher pH values ​​and a wider pH range, and no iron sludge is produced during the reaction.

[0003] In-situ electrochemical production of H2O2 relies on an effective oxygen supply. In in-situ H2O2 electrochemical systems, due to the difference in electron transfer between the anode (four-electron OER process) and the cathode (two-electron ORR process), the oxygen consumed by the cathode to produce H2O2 is twice that of conventional methods. Therefore, it is necessary to add equipment to aerate the water to increase the oxygen content. To solve the above problem, the prior art CN 114426320 B discloses a method for preparing a FeOCl / nitrogen-phosphorus self-doped biochar cathode and its application in wastewater treatment. This technical solution divides the cathode into three parts: a gas diffusion layer, a catalytic layer, and a FeOCl layer. It can directly generate H2O2 without aeration, and the generated H2O2 can be directly catalyzed by FeOCl to generate HO· on the electrode surface. At the same time, the anode material with a high oxygen evolution potential is used to form HO· from water molecules, forming an electrocatalytic system that simultaneously degrades organic matter at both the anode and cathode.

[0004] Furthermore, this invention discovers that in the two-electron ORR process, high-current-induced rapid electrowetting can disrupt the initial gas capture channel of the electrode, leading to O2 starvation at the electroactive interface, thereby reducing the efficiency of the electrochemical in-situ H2O2 production reaction and resulting in a decrease in electrocatalytic efficiency. Utility Model Content

[0005] This invention addresses the low reaction efficiency of existing electro-Fenton devices by providing a dual-cathode coupled electrocatalytic antibiotic wastewater treatment device. The device comprises a first electrolytic cell and a second electrolytic cell. The first electrolytic cell contains an MMO electrode and a CB-PTFE / GF cracked electrode, while the second electrolytic cell contains a BDD electrode and a FeOCl / GF composite electrode. The device produces oxygen via the MMO electrode, then produces H2O2 via the CB-PTFE / GF cracked electrode, and finally catalytically converts H2O2 to HO· via the FeOCl / GF composite electrode, while also removing Fe... 3+ Electroreduction to Fe 2+ To avoid the formation of iron sludge, this device is simple, produces no secondary pollution, requires no auxiliary equipment, and can efficiently degrade antibiotic wastewater.

[0006] The specific technical solution of this utility model is as follows:

[0007] A dual-cathode coupled electrocatalytic antibiotic wastewater treatment device includes a first electrolytic cell, a second electrolytic cell, a wastewater container, a purification container, and a power supply connected in sequence. The first electrolytic cell contains an MMO electrode and a CB-PTFE / GF crack electrode electrically connected to the power supply. The second electrolytic cell contains a BDD electrode and a FeOCl / GF composite electrode electrically connected to the power supply. The first electrolytic cell has a first inlet and a first outlet connected to the wastewater container. The second electrolytic cell has a second outlet and a second inlet connected to the purification container. The first outlet is connected to the second inlet. The CB-PTFE / GF crack electrode includes a substrate and a CB-PTFE membrane layer disposed on the substrate. The CB-PTFE membrane layer is a discontinuous membrane with microcracks penetrating through it.

[0008] This invention provides a dual-cathode coupled electrocatalytic antibiotic wastewater treatment device. The device comprises a first electrolytic cell, a second electrolytic cell, a wastewater container, a purification container, and a power supply. The first electrolytic cell contains an MMO electrode and a FeOCl / GF composite electrode, while the second electrolytic cell contains a BDD electrode and a CB-PTFE / GF cracked electrode. During operation, the MMO electrode generates O2, the CB-PTFE / GF cracked electrode converts O2 and water into H2O2, and the FeOCl / GF composite electrode catalyzes the H2O2 to form HO·, and the Fe·... 3+ Electroreduction to Fe 2+ The device is simple, produces no secondary pollution, requires no auxiliary equipment, and can efficiently degrade antibiotic wastewater.

[0009] The CB-PTFE / GF crack electrode of this device is formed by coating CB-PTFE catalyst onto the surface of graphite felt (GF) and then annealing it to form a discontinuous film with dense, penetrating microcracks on the GF surface. This electrode can overcome the problem that high-current-induced rapid electrowetting will destroy the initial gas capture channel and reduce the efficiency of H2O2 production. The weakening of the local electric field and liquid permeation capillary force caused by the spatial discontinuity of the discontinuous film, and the micron-sized film cracks can ensure the hydrophobicity of the electrode, allowing oxygen to diffuse freely in the crack channels. This enables the electrode to maintain high H2O2 production efficiency during high-current electrolysis, significantly broadening the application range of electrocatalytic devices.

[0010] The FeOCl / GF composite electrode is an electrode in which FeOCl catalyst is coated on the surface of GF and supported.

[0011] The material of the BDD electrode is BDD diamond.

[0012] The MMO electrode is either an MMO hybrid metal electrode or a ruthenium-iridium electrode.

[0013] The device has a first inlet and a first outlet on the first electrolytic cell, and a second inlet and a second outlet on the second electrolytic cell. Wastewater enters from the first inlet and exits from the second outlet. The liquids entering the first and second electrolytic cells can exchange liquids through the first outlet and the second inlet, so that the liquids in the electrolytic cells form a cycle, and the liquids in the first and second electrolytic cells are quickly mixed, thereby increasing the mass exchange rate of the first and second electrolytic cells and improving the oxidation efficiency of organic wastewater.

[0014] Preferably, the first electrolytic cell includes a first anode electrolytic cell and a first cathode electrolytic cell, with the MMO electrode located in the first anode electrolytic cell and the CB-PTFE / GF crack electrode located in the first cathode electrolytic cell.

[0015] Preferably, the first anode electrolytic cell is provided with a first anode support that is electrically connected to the power supply, and the MMO electrode is electrically connected to the first anode support.

[0016] Preferably, the first cathode electrolytic cell is provided with a first cathode support that is electrically connected to a power source, and the CB-PTFE / GF crack electrode is electrically connected to the first cathode support and the power source.

[0017] Preferably, the second electrolytic cell includes a second anode electrolytic cell and a second cathode electrolytic cell, with the BDD electrode located in the second anode electrolytic cell and the FeOCl / GF composite electrode located in the second cathode electrolytic cell.

[0018] Preferably, the second anode electrolytic cell is provided with a second anode support that is electrically connected to the power supply, and the BDD electrode is electrically connected to the second anode support.

[0019] Preferably, the second anode electrolytic cell is provided with a second cathode support that is electrically connected to the power supply, and the FeOCl / GF composite electrode is electrically connected to the second cathode support.

[0020] Preferably, the voltage of the power supply is 0~32 V and the current of the power supply is 0~3 A.

[0021] Preferably, the power source is a constant power source.

[0022] Preferably, the surface area ratio of the BDD electrode to the FeOCl / GF composite electrode is 1:1~5, and the surface area ratio of the MMO electrode to the CB-PTFE / GF crack electrode is 1:1~5.

[0023] Compared with the prior art, this application has the following technical effects:

[0024] (1) The device is simple in structure and easy to operate; all reaction processes are completed in a single reaction device without the need for other auxiliary equipment, resulting in low operating and operating costs. The device has high degradation efficiency, with a removal rate of more than 80% for antibiotic wastewater. The reaction product is water, with no harmful byproducts.

[0025] (2) The first cathode used in this device is a CB-PTFE / GF crack electrode. The gas diffusion layer of this electrode can efficiently utilize oxygen, thereby realizing a 2-electron reaction and producing H2O2 in situ with high efficiency.

[0026] (3) The second cathode used in this device is a FeOCl / GF composite electrode, which can not only efficiently activate the production of HO·, but also treat Fe 3+ Electroreduction is performed to avoid the formation of iron sludge and to achieve the recycling of iron ions. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating the present invention.

[0028] Figure 2 This is a cross-sectional view of the first and second electrolytic cells of this utility model.

[0029] In the figure, the components are: first electrolytic cell 1, MMO electrode 101, CB-PTFE / GF crack electrode 102, first inlet 103, first outlet 104, first anode electrolytic cell 105, first cathode electrolytic cell 106, first anode support 107, first cathode support 108, second electrolytic cell 2, BDD electrode 201, FeOCl / GF composite electrode 202, second inlet 203, second outlet 204, second anode electrolytic cell 205, second cathode electrolytic cell 206, second anode support 207, second cathode support 208, wastewater container 3, purification container 4, power supply 5, and peristaltic pump 6. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments.

[0031] Example 1:

[0032] like Figure 1 As shown, a dual-cathode coupled electrocatalytic antibiotic wastewater treatment device includes a first electrolytic cell 1, a second electrolytic cell 2, a wastewater container 3, a purification container 4, and a power supply 5.

[0033] like Figure 2 As shown, the first electrolytic cell includes a first anode electrolytic cell 105 and a first cathode electrolytic cell 106 disposed on the first anode electrolytic cell, and the second electrolytic cell includes a second cathode electrolytic cell 206 disposed on the first cathode electrolytic cell and a second anode electrolytic cell 205 disposed on the second cathode electrolytic cell;

[0034] The first anode electrolytic cell is provided with a first anode support 107, and an MMO electrode 101 is provided on the first anode support. The first anode support is electrically connected to the MMO electrode and the positive terminal of the power supply.

[0035] The first cathode electrolytic cell is provided with a first cathode support 108, and a CB-PTFE / GF crack electrode 102 is provided on the first cathode support. The first cathode support is electrically connected to the CB-PTFE / GF crack electrode and the negative terminal of the power supply.

[0036] The second anode electrolytic cell is provided with a second anode support 207, and a BDD electrode 201 is provided on the second anode support. The second anode support is electrically connected to the BDD electrode and the positive terminal of the power supply.

[0037] The second cathode electrolytic cell is provided with a second cathode support 208, and a FeOCl / GF composite electrode 202 is provided on the second cathode support. The second cathode support is electrically connected to the FeOCl / GF composite electrode and the negative terminal of the power supply.

[0038] The first anode electrolytic cell is provided with a first inlet 103 and a first outlet 104, and the second anode electrolytic cell is provided with a second inlet 203 and a second outlet 204; the wastewater container is connected to the first inlet through a delivery pipe and a peristaltic pump 6, and the purification container is connected to the second outlet through a pipe and a peristaltic pump 6. The first outlet and the second inlet are connected by a pipe and a peristaltic pump 6.

[0039] Example 2:

[0040] A dual-cathode coupled electrocatalytic antibiotic wastewater treatment device includes a first electrolytic cell 1, a second electrolytic cell 2, a wastewater container 3, a purification container 4, and a power supply 5. The power supply is a constant power supply DH1766A-1. The first electrolytic cell includes a first anode electrolytic cell 105 and a first cathode electrolytic cell 106 disposed on the first anode electrolytic cell. The second electrolytic cell includes a second cathode electrolytic cell 206 disposed on the first cathode electrolytic cell and a second anode electrolytic cell 205 disposed on the second cathode electrolytic cell.

[0041] The first anode electrolytic cell is equipped with a first anode support 107, on which an MMO electrode 101 is mounted. The first anode support is electrically connected to the MMO electrode and the positive terminal of the power supply. The area of ​​each MMO electrode is 9.62 cm². 2 ;

[0042] The first cathode electrolytic cell contains a first cathode support 108, on which a CB-PTFE / GF crack electrode 102 is mounted. The first cathode support is electrically connected to the CB-PTFE / GF crack electrode and the negative terminal of the power supply. The area of ​​the CB-PTFE / GF crack electrode is 9.62 cm². 2 ;

[0043] The second anode electrolytic cell is equipped with a second anode support 207, on which a BDD electrode 201 is mounted. The second anode support is electrically connected to the BDD electrode and the positive terminal of the power supply. The area of ​​the BDD electrode is 2 cm². 2 ;

[0044] The second cathode electrolytic cell is equipped with a second cathode support 208, on which a FeOCl / GF composite electrode 202 is mounted. The second cathode support is electrically connected to the FeOCl / GF composite electrode and the negative terminal of the power supply. The area of ​​the FeOCl / GF composite electrode is 2 cm². 2 ;

[0045] The first anode electrolytic cell is provided with a first inlet 103 and a first outlet 104, and the second anode electrolytic cell is provided with a second inlet 203 and a second outlet 204.

[0046] The wastewater container is connected to the first inlet via an infusion pipe and a peristaltic pump, and the purification container is connected to the second outlet via a pipe and a peristaltic pump. The first outlet and the second inlet are connected by a pipe and a peristaltic pump.

[0047] The aforementioned dual-cathode coupled electrocatalytic antibiotic wastewater treatment device was used to treat 20 mg / L oxytetracycline wastewater. 400 ml of wastewater was injected into a wastewater container, and the pH was adjusted to 3. The wastewater was then pumped from the container through a peristaltic pump into the first inlet and subsequently into the first and second electrolytic cells for electrolysis. After electrolysis, a peristaltic pump was used to pump the electrolyte from the second outlet into a purification container. A pump between the first and second outlets pumped the electrolyte from the first inlet into the second outlet to complete the exchange of electrolytes. A 5 mA cm⁻¹ flow rate was used for each outlet. -2 10 mA cm -2 15 mA cm -2 and 20 mA cm -2 The current density was used to test the wastewater, and the oxytetracycline content in the device was tested every ten minutes. The test results showed that the removal rate of oxytetracycline could reach up to 78% after 60 minutes of degradation treatment.

[0048] Example 3:

[0049] A dual-cathode coupled electrocatalytic antibiotic wastewater treatment device includes a first electrolytic cell 1, a second electrolytic cell 2, a wastewater container 3, a purification container 4, and a power supply 5. The power supply is a constant power supply DH1766A-1. The first electrolytic cell includes a first anode electrolytic cell 105 and a first cathode electrolytic cell 106 disposed on the first anode electrolytic cell. The second electrolytic cell includes a second cathode electrolytic cell 206 disposed on the first cathode electrolytic cell and a second anode electrolytic cell 205 disposed on the second cathode electrolytic cell.

[0050] The first anode electrolytic cell is equipped with a first anode support 107, on which an MMO electrode 101 is mounted. The first anode support is electrically connected to the MMO electrode and the positive terminal of the power supply. The area of ​​each MMO electrode is 9.62 cm². 2 ;

[0051] The first cathode electrolytic cell contains a first cathode support 108, on which a CB-PTFE / GF crack electrode 102 is mounted. The first cathode support is electrically connected to the CB-PTFE / GF crack electrode and the negative terminal of the power supply. The area of ​​the CB-PTFE / GF crack electrode is 9.62 cm². 2 ;

[0052] The second anode electrolytic cell is equipped with a second anode support 207, on which a BDD electrode 201 is mounted. The second anode support is electrically connected to the BDD electrode and the positive terminal of the power supply. The area of ​​the BDD electrode is 2 cm². 2 ;

[0053] The second cathode electrolytic cell is equipped with a second cathode support 208, on which a FeOCl / GF composite electrode 202 is mounted. The second cathode support is electrically connected to the FeOCl / GF composite electrode and the negative terminal of the power supply. The area of ​​the FeOCl / GF composite electrode is 2 cm². 2 ;

[0054] The first anode electrolytic cell is provided with a first inlet 103 and a first outlet 104, and the second anode electrolytic cell is provided with a second inlet 203 and a second outlet 204.

[0055] The wastewater container is connected to the first inlet via an infusion pipe and a peristaltic pump, and the purification container is connected to the second outlet via a pipe and a peristaltic pump. The first outlet and the second inlet are connected by a pipe and a peristaltic pump.

[0056] The aforementioned dual-cathode coupled electrocatalytic antibiotic wastewater treatment device was used to treat 15 mg / L levofloxacin wastewater. 400 ml of wastewater was injected into a wastewater container, and the pH was adjusted to 3. The wastewater was then pumped from the container through a peristaltic pump into the first inlet and subsequently into the first and second electrolytic cells for electrolysis. After electrolysis, a peristaltic pump was used to pump the electrolyte from the second outlet into a purification container. A pump between the first and second outlets pumped the electrolyte from the first inlet into the second outlet to complete the exchange of electrolytes. A 5 mA cm⁻¹ flow rate was used for each outlet. -2 10 mA cm -2 15 mA cm -2 and 20 mAcm -2 The current density was used to test the wastewater, and the levofloxacin content in the device was tested every ten minutes. The test results showed that the removal rate of levofloxacin could reach up to 75% after 60 minutes of degradation treatment.

[0057] Example 4:

[0058] A dual-cathode coupled electrocatalytic antibiotic wastewater treatment device includes a first electrolytic cell 1, a second electrolytic cell 2, a wastewater container 3, a purification container 4, and a power supply 5. The power supply is a constant power supply DH1766A-1. The first electrolytic cell includes a first anode electrolytic cell 105 and a first cathode electrolytic cell 106 disposed on the first anode electrolytic cell. The second electrolytic cell includes a second cathode electrolytic cell 206 disposed on the first cathode electrolytic cell and a second anode electrolytic cell 205 disposed on the second cathode electrolytic cell.

[0059] The first anode electrolytic cell is equipped with a first anode support 107, on which an MMO electrode 101 is mounted. The first anode support is electrically connected to the MMO electrode and the positive terminal of the power supply. The area of ​​each MMO electrode is 9.62 cm². 2 ;

[0060] The first cathode electrolytic cell contains a first cathode support 108, on which a CB-PTFE / GF crack electrode 102 is mounted. The first cathode support is electrically connected to the CB-PTFE / GF crack electrode and the negative terminal of the power supply. The area of ​​the CB-PTFE / GF crack electrode is 9.62 cm². 2 ;

[0061] The second anode electrolytic cell is equipped with a second anode support 207, on which a BDD electrode 201 is mounted. The second anode support is electrically connected to the BDD electrode and the positive terminal of the power supply. The area of ​​the BDD electrode is 2 cm². 2 ;

[0062] The second cathode electrolytic cell is equipped with a second cathode support 208, on which a FeOCl / GF composite electrode 202 is mounted. The second cathode support is electrically connected to the FeOCl / GF composite electrode and the negative terminal of the power supply. The area of ​​the FeOCl / GF composite electrode is 2 cm². 2 ;

[0063] The first anode electrolytic cell is provided with a first inlet 103 and a first outlet 104, and the second anode electrolytic cell is provided with a second inlet 203 and a second outlet 204.

[0064] The wastewater container is connected to the first inlet via an infusion pipe and a peristaltic pump, and the purification container is connected to the second outlet via a pipe and a peristaltic pump. The first outlet and the second inlet are connected by a pipe and a peristaltic pump.

[0065] The aforementioned dual-cathode coupled electrocatalytic antibiotic wastewater treatment device was used to treat 20 mg / L sulfamethoxazole wastewater. 400 ml of wastewater was injected into a wastewater container, and the pH was adjusted to 3. The wastewater was then pumped from the container through a peristaltic pump into the first inlet and subsequently into the first and second electrolytic cells for electrolysis. After electrolysis, a peristaltic pump was used to pump the electrolyte from the second outlet into a purification container. A pump between the first and second outlets pumped the electrolyte from the first inlet into the second outlet to complete the exchange of electrolytes. A 5 mA cm⁻¹ flow rate was used for each outlet. -2 10 mA cm -2 15 mA cm -2 and 20 mAcm -2 The current density was used to test the wastewater, and the sulfamethoxazole content in the device was tested every ten minutes. The test results showed that the removal rate of sulfamethoxazole could reach up to 89% after 60 minutes of degradation treatment.

[0066] Example 5:

[0067] A dual-cathode coupled electrocatalytic antibiotic wastewater treatment device includes a first electrolytic cell 1, a second electrolytic cell 2, a wastewater container 3, a purification container 4, and a power supply 5. The power supply is a constant power supply DH1766A-1. The first electrolytic cell includes a first anode electrolytic cell 105 and a first cathode electrolytic cell 106 disposed on the first anode electrolytic cell. The second electrolytic cell includes a second cathode electrolytic cell 206 disposed on the first cathode electrolytic cell and a second anode electrolytic cell 205 disposed on the second cathode electrolytic cell.

[0068] The first anode electrolytic cell is equipped with a first anode support 107, on which an MMO electrode 101 is mounted. The first anode support is electrically connected to the MMO electrode and the positive terminal of the power supply. The area of ​​each MMO electrode is 9.62 cm². 2 ;

[0069] The first cathode electrolytic cell contains a first cathode support 108, on which a CB-PTFE / GF crack electrode 102 is mounted. The first cathode support is electrically connected to the CB-PTFE / GF crack electrode and the negative terminal of the power supply. The area of ​​the CB-PTFE / GF crack electrode is 9.62 cm². 2 ;

[0070] The second anode electrolytic cell is equipped with a second anode support 207, on which a BDD electrode 201 is mounted. The second anode support is electrically connected to the BDD electrode and the positive terminal of the power supply. The area of ​​the BDD electrode is 2 cm². 2 ;

[0071] The second cathode electrolytic cell is equipped with a second cathode support 208, on which a FeOCl / GF composite electrode 202 is mounted. The second cathode support is electrically connected to the FeOCl / GF composite electrode and the negative terminal of the power supply. The area of ​​the FeOCl / GF composite electrode is 2 cm². 2 ;

[0072] The first anode electrolytic cell is provided with a first inlet 103 and a first outlet 104, and the second anode electrolytic cell is provided with a second inlet 203 and a second outlet 204.

[0073] The wastewater container is connected to the first inlet via an infusion pipe and a peristaltic pump, and the purification container is connected to the second outlet via a pipe and a peristaltic pump. The first outlet and the second inlet are connected by a pipe and a peristaltic pump.

[0074] The aforementioned dual-cathode coupled electrocatalytic antibiotic wastewater treatment device was used to treat 15 mg / L levofloxacin wastewater. 400 ml of wastewater was injected into a wastewater container, and the pH value was adjusted to 2, 3, 4, and 5 for testing. The wastewater was pumped from the wastewater container into the first inlet via a peristaltic pump, entering the first and second electrolytic cells for electrolysis. After electrolysis, a peristaltic pump was used to pump the electrolyte from the second outlet into a purification container. A pump between the first and second outlets pumped the electrolyte from the first inlet into the second outlet to complete the exchange of electrolytes. A 10 mA cm⁻¹ flow rate was used. -2 The current density was used to test the wastewater, and the levofloxacin content in the device was tested every ten minutes. The test results showed that the removal rate of levofloxacin could reach up to 78% after 60 minutes of degradation treatment.

[0075] Example 6:

[0076] A dual-cathode coupled electrocatalytic antibiotic wastewater treatment device includes a first electrolytic cell 1, a second electrolytic cell 2, a wastewater container 3, a purification container 4, and a power supply 5. The power supply is a constant power supply DH1766A-1. The first electrolytic cell includes a first anode electrolytic cell 105 and a first cathode electrolytic cell 106 disposed on the first anode electrolytic cell. The second electrolytic cell includes a second cathode electrolytic cell 206 disposed on the first cathode electrolytic cell and a second anode electrolytic cell 205 disposed on the second cathode electrolytic cell.

[0077] The first anode electrolytic cell is equipped with a first anode support 107, on which an MMO electrode 101 is mounted. The first anode support is electrically connected to the MMO electrode and the positive terminal of the power supply. The area of ​​each MMO electrode is 9.62 cm². 2 ;

[0078] The first cathode electrolytic cell contains a first cathode support 108, on which a CB-PTFE / GF crack electrode 102 is mounted. The first cathode support is electrically connected to the CB-PTFE / GF crack electrode and the negative terminal of the power supply. The area of ​​the CB-PTFE / GF crack electrode is 9.62 cm². 2 ;

[0079] The second anode electrolytic cell is equipped with a second anode support 207, on which a BDD electrode 201 is mounted. The second anode support is electrically connected to the BDD electrode and the positive terminal of the power supply. The area of ​​the BDD electrode is 2 cm². 2 ;

[0080] The second cathode electrolytic cell is equipped with a second cathode support 208, on which a FeOCl / GF composite electrode 202 is mounted. The second cathode support is electrically connected to the FeOCl / GF composite electrode and the negative terminal of the power supply. The area of ​​the FeOCl / GF composite electrode is 2 cm². 2;

[0081] The first anode electrolytic cell is provided with a first inlet 103 and a first outlet 104, and the second anode electrolytic cell is provided with a second inlet 203 and a second outlet 204.

[0082] The wastewater container is connected to the first inlet via an infusion pipe and a peristaltic pump, and the purification container is connected to the second outlet via a pipe and a peristaltic pump. The first outlet and the second inlet are connected by a pipe and a peristaltic pump.

[0083] The aforementioned dual-cathode coupled electrocatalytic antibiotic wastewater treatment device was used to treat 20 mg / L sulfamethoxazole wastewater. 400 ml of wastewater was injected into a wastewater container, and the pH value was adjusted to 2, 3, 4, and 5 for testing. The wastewater was pumped from the wastewater container into the first inlet via a peristaltic pump, entering the first and second electrolytic cells for electrolysis. After electrolysis, the electrolyte was pumped from the second outlet into a purification container using a peristaltic pump. A pump between the first and second outlets pumped the electrolyte from the first inlet into the second outlet to complete the exchange of electrolytes. A 10 mA cm⁻¹ flow rate was used. -2 The current density was used to test the wastewater, and the sulfamethoxazole content in the device was tested every ten minutes. The test results showed that the removal rate of sulfamethoxazole could reach up to 90% after 60 minutes of degradation treatment.

[0084] Example 7:

[0085] A dual-cathode coupled electrocatalytic antibiotic wastewater treatment device includes a first electrolytic cell 1, a second electrolytic cell 2, a wastewater container 3, a purification container 4, and a power supply 5. The power supply is a constant power supply DH1766A-1. The first electrolytic cell includes a first anode electrolytic cell 105 and a first cathode electrolytic cell 106 disposed on the first anode electrolytic cell. The second electrolytic cell includes a second cathode electrolytic cell 206 disposed on the first cathode electrolytic cell and a second anode electrolytic cell 205 disposed on the second cathode electrolytic cell.

[0086] The first anode electrolytic cell is equipped with a first anode support 107, on which an MMO electrode 101 is mounted. The first anode support is electrically connected to the MMO electrode and the positive terminal of the power supply. The area of ​​each MMO electrode is 9.62 cm². 2 ;

[0087] The first cathode electrolytic cell contains a first cathode support 108, on which a CB-PTFE / GF crack electrode 102 is mounted. The first cathode support is electrically connected to the CB-PTFE / GF crack electrode and the negative terminal of the power supply. The area of ​​the CB-PTFE / GF crack electrode is 9.62 cm². 2 ;

[0088] The second anode electrolytic cell is equipped with a second anode support 207, on which a BDD electrode 201 is mounted. The second anode support is electrically connected to the BDD electrode and the positive terminal of the power supply. The area of ​​the BDD electrode is 2 cm². 2 ;

[0089] The second cathode electrolytic cell is equipped with a second cathode support 208, on which a FeOCl / GF composite electrode 202 is mounted. The second cathode support is electrically connected to the FeOCl / GF composite electrode and the negative terminal of the power supply. The area of ​​the FeOCl / GF composite electrode is 2 cm². 2 ;

[0090] The first anode electrolytic cell is provided with a first inlet 103 and a first outlet 104, and the second anode electrolytic cell is provided with a second inlet 203 and a second outlet 204.

[0091] The wastewater container is connected to the first inlet via an infusion pipe and a peristaltic pump, and the purification container is connected to the second outlet via a pipe and a peristaltic pump. The first outlet and the second inlet are connected by a pipe and a peristaltic pump.

[0092] The aforementioned dual-cathode coupled electrocatalytic antibiotic wastewater treatment device was used to treat 20 mg / L oxytetracycline wastewater. 400 ml of wastewater was injected into a wastewater container, and the pH value was adjusted to 2, 3, 4, and 5 for testing. The wastewater was pumped from the wastewater container into the first and second electrolytic cells via a peristaltic pump through the first inlet. Then, a peristaltic pump pumped the electrolyte from the second outlet into the purification container. A pump between the first and second outlets pumped the electrolyte from the first inlet into the second outlet to complete the exchange of electrolytes. A 10 mA cm⁻¹ flow rate was used. -2 The current density was used to test the wastewater, and the oxytetracycline content in the device was tested every ten minutes. The test results showed that the removal rate of oxytetracycline could reach up to 75% after 60 minutes of degradation treatment.

[0093] Example 8:

[0094] A dual-cathode coupled electrocatalytic antibiotic wastewater treatment device includes a first electrolytic cell 1, a second electrolytic cell 2, a wastewater container 3, a purification container 4, and a power supply 5. The power supply is a constant power supply DH1766A-1. The first electrolytic cell includes a first anode electrolytic cell 105 and a first cathode electrolytic cell 106 disposed on the first anode electrolytic cell. The second electrolytic cell includes a second cathode electrolytic cell 206 disposed on the first cathode electrolytic cell and a second anode electrolytic cell 205 disposed on the second cathode electrolytic cell.

[0095] The first anode electrolytic cell is equipped with a first anode support 107, on which an MMO electrode 101 is mounted. The first anode support is electrically connected to the MMO electrode and the positive terminal of the power supply. The area of ​​each MMO electrode is 9.62 cm².2 ;

[0096] The first cathode electrolytic cell contains a first cathode support 108, on which a CB-PTFE / GF crack electrode 102 is mounted. The first cathode support is electrically connected to the CB-PTFE / GF crack electrode and the negative terminal of the power supply. The area of ​​the CB-PTFE / GF crack electrode is 9.62 cm². 2 ;

[0097] The second anode electrolytic cell is equipped with a second anode support 207, on which a BDD electrode 201 is mounted. The second anode support is electrically connected to the BDD electrode and the positive terminal of the power supply. The area of ​​the BDD electrode is 2 cm². 2 ;

[0098] The second cathode electrolytic cell is equipped with a second cathode support 208, on which a FeOCl / GF composite electrode 202 is mounted. The second cathode support is electrically connected to the FeOCl / GF composite electrode and the negative terminal of the power supply. The area of ​​the FeOCl / GF composite electrode is 2 cm². 2 ;

[0099] The first anode electrolytic cell is provided with a first inlet 103 and a first outlet 104, and the second anode electrolytic cell is provided with a second inlet 203 and a second outlet 204.

[0100] The wastewater container is connected to the first inlet via an infusion pipe and a peristaltic pump, and the purification container is connected to the second outlet via a pipe and a peristaltic pump. The first outlet and the second inlet are connected by a pipe and a peristaltic pump.

[0101] The aforementioned dual-cathode coupled electrocatalytic antibiotic wastewater treatment device was used to treat 400 ml of wastewater containing 20 mg / L oxytetracycline, 400 ml of 15 mg / L levofloxacin, and 400 ml of 20 mg / L sulfamethoxazole. The wastewater was injected into a wastewater container, and the pH was adjusted to 3 for testing. The wastewater was pumped from the container into the first and second electrolytic cells via a peristaltic pump through the first inlet for electrolysis. After electrolysis, the electrolyte was pumped from the second outlet into a purification container using a peristaltic pump. A pump between the first and second outlets pumped the electrolyte from the first inlet to the second outlet to complete the exchange of electrolytes. A 10 mA cm⁻¹ flow rate was used. -2 The current density was used to test the wastewater, and the oxytetracycline content in the device was tested every ten minutes. The test results showed that after 60 minutes of degradation treatment, the removal rate of oxytetracycline and levofloxacin could reach more than 80%, and the removal rate of sulfamethoxazole could reach more than 90%.

[0102] The results of the above embodiments show that the dual-cathode coupled electrocatalytic antibiotics provided by this invention have excellent degradation performance on oxytetracycline, levofloxacin and sulfamethoxazole, and can achieve a removal rate of more than 80% within 60 minutes.

[0103] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A dual cathode coupled electrocatalytic antibiotic wastewater device, characterized in that, The device includes a first electrolytic cell (1), a second electrolytic cell (2), a wastewater container (3), a purification container (4), and a power supply (5). The first electrolytic cell is equipped with an MMO electrode (101) and a CB-PTFE / GF crack electrode (102) electrically connected to the power supply. The second electrolytic cell is equipped with a BDD electrode (201) and a FeOCl / GF composite electrode (202) electrically connected to the power supply. The first electrolytic cell is equipped with a first inlet (103) and a first outlet (104) connected to the wastewater container. The second electrolytic cell is equipped with a second outlet (203) and a second inlet (204) connected to the purification container. The first outlet is connected to the second inlet.

2. The dual cathode coupled electrocatalytic antibiotic wastewater device of claim 1, wherein, The CB-PTFE / GF crack electrode includes a substrate and a CB-PTFE film layer disposed on the substrate. The CB-PTFE film layer is a discontinuous film that penetrates the microcrack. The first electrolytic cell includes a first anodic electrolytic cell (105) and a first cathodic electrolytic cell (106). The MMO electrode is located in the first anodic electrolytic cell, and the CB-PTFE / GF crack electrode is located in the first cathodic electrolytic cell.

3. The dual cathode coupled electrocatalytic antibiotic wastewater device of claim 2, wherein, The first anode electrolytic cell is provided with a first anode support (107) that is electrically connected to the power supply, and the MMO electrode is electrically connected to the first anode support.

4. The dual-cathode coupled electrocatalytic antibiotic wastewater treatment device according to claim 2, characterized in that, The first cathode electrolytic cell is provided with a first cathode support (108) that is electrically connected to a power source, and the CB-PTFE / GF crack electrode is electrically connected to the first cathode support and the power source.

5. The dual-cathode coupled electrocatalytic antibiotic wastewater treatment device according to claim 1, characterized in that, The second electrolytic cell includes a second anode electrolytic cell (205) and a second cathode electrolytic cell (206), with the BDD electrode located in the second anode electrolytic cell and the FeOCl / GF composite electrode located in the second cathode electrolytic cell.

6. The dual-cathode coupled electrocatalytic antibiotic wastewater treatment device according to claim 5, characterized in that, The second anode electrolytic cell is provided with a second anode support (207) that is electrically connected to the power supply, and the BDD electrode is electrically connected to the second anode support.

7. The dual-cathode coupled electrocatalytic antibiotic wastewater treatment device according to claim 5, characterized in that, The second anode electrolytic cell is equipped with a second cathode support (208) that is electrically connected to the power supply, and the FeOCl / GF composite electrode is electrically connected to the second cathode support.

8. The dual-cathode coupled electrocatalytic antibiotic wastewater treatment device according to claim 1, characterized in that, The voltage of the power supply is 0~32 V, and the current of the power supply is 0~3 A.

9. The dual-cathode coupled electrocatalytic antibiotic wastewater treatment device according to claim 1 or 8, characterized in that, The power source is a constant power source.

10. The dual-cathode coupled electrocatalytic antibiotic wastewater treatment device according to claim 1, characterized in that, The surface area ratio of the BDD electrode to the FeOCl / GF composite electrode is 1:1~5, and the surface area ratio of the MMO electrode to the CB-PTFE / GF crack electrode is 1:1~5.

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