Electrocatalytic treatment device for saline organic wastewater

Abstract

The present invention relates to the technical field of salt-containing organic wastewater, in particular to an electrocatalytic treatment device for salt-containing organic wastewater, comprising a treatment tank and an aeration unit, wherein an A electrode, a B electrode, a C electrode and a D electrode are sequentially arranged in a treatment chamber along a direction from a water inlet to a water outlet; the A electrode is an anode, comprising an A electrode substrate made of titanium or a titanium alloy and a ruthenium oxide layer or a lead oxide layer arranged on the surface of the A electrode substrate; the B electrode is a cathode; the aeration unit is used to introduce air into the B electrode; the C electrode is an anode, the B electrode and the C electrode are made of iron material; the D electrode is a cathode; and the present invention utilizes Fe 2+ The active oxidative species in the / HClO electrochemical system is Fe IV O 2+ , its redox potential is higher than that of HClO and Cl2· ‑ High, but lower than Cl· ‑ , thus effectively avoiding the formation of chlorinated by-products; the air diffusion cathode and the functionalized cathode can also interact at different optimal working current densities to achieve efficient H2O2 and reactive oxygen species production simultaneously.

Description

Technical Field

[0001] The invention relates to the technical field of saline organic wastewater, in particular to an electrocatalytic treatment device for saline organic wastewater. Background Art

[0002] Salty organic wastewater refers to wastewater containing both organic matter and dissolved salts, mainly from industrial production that directly utilizes seawater, domestic water and food processing plants, chemical plants, and the collection and processing of oil and natural gas. In addition to organic pollutants, these wastewaters also contain a large amount of inorganic salts, such as Cl - , SO4 2- , Na + , Ca 2+ Plasma. If discharged directly without treatment, it will inevitably cause significant harm to aquatic organisms, domestic drinking water, and industrial and agricultural production water. However, the brine concentration in conventional treatment methods cannot be too high. The presence of salt will affect the function of microorganisms and significantly reduce the efficiency of biological treatment. Therefore, it is necessary to develop a process technology that can simultaneously degrade microorganisms and desalinate.

[0003] Currently, conventional treatment processes include: 1. Low-temperature, multi-effect plate-type evaporation and concentration desalination of high-salinity wastewater, which is extremely energy-intensive. 2. Physical and chemical methods, including evaporation, electrochemistry, ion exchange, adsorption, and membrane separation, can remove salt and organic matter from wastewater in some applications, but they generally come with high costs and can easily cause secondary contamination of recycled wastewater.

[0004] The traditional electrochlorination method can oxidize some pollutants, but when oxidizing organic pollutants, the generated Cl·- has a high redox potential and is easy to produce chlorinated toxic byproducts with organic matter, so its application is limited.

[0005] In traditional electro-Fenton technology, the required potentials for producing hydrogen peroxide and hydroxyl radicals are significantly different. Therefore, if the reactions are carried out under the same potential difference, antagonism is likely to occur, which limits the degradation efficiency. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: in order to solve the deficiencies in the prior art, an electrocatalytic treatment device for saline organic wastewater is provided.

[0007] The technical solution adopted by the present invention to solve the technical problem is: an electrocatalytic treatment device for salt-containing organic wastewater, comprising a treatment tank and an aeration unit, wherein the treatment tank has a treatment chamber, an inner wall of one end of the treatment chamber is provided with a water inlet, and an inner wall of the other end is provided with a water outlet, and an electrode A, an electrode B, an electrode C, and an electrode D are arranged in sequence in the direction from the water inlet to the water outlet in the treatment chamber;

[0008] The A electrode is an anode, and the A electrode includes an A electrode substrate made of titanium or titanium alloy and a ruthenium oxide layer or a lead oxide layer provided on the surface of the A electrode substrate. The A electrode is used to generate chlorine gas on the surface of the A electrode when energized;

[0009] The B electrode is a cathode and is made of iron. The aeration unit is used to introduce air into the B electrode so that oxygen forms hydrogen peroxide around the B electrode after power is applied to the B electrode.

[0010] The C electrode is an anode, and the material of the C electrode is iron material. The C electrode is used to form ferrous ions after being energized, and form Fe IV O 2+ ;

[0011] The D electrode is a cathode, and is used to react hydrogen peroxide and ferrous ions flowing through the D electrode to generate hydroxyl radicals after power is applied.

[0012] Furthermore, an E electrode and a plastic shell are provided in the treatment chamber, and the D electrode and the E electrode are arranged in sequence from the water inlet to the water outlet;

[0013] The E electrode is an anode, and the E electrode includes an E electrode substrate made of titanium or titanium alloy and a ruthenium oxide layer or a lead oxide layer provided on the surface of the E electrode substrate. The E electrode is used to generate chlorine gas on the surface of the E electrode when energized.

[0014] The plastic shell is disposed in the treatment chamber, the plastic shell having an inner cavity, the inner wall of the inner cavity being penetrated by a plurality of convection holes communicating with the treatment chamber, the E electrode being disposed in the inner cavity, and a gas collecting cavity being formed between the upper end of the inner cavity and the liquid surface of the saline organic wastewater in the inner cavity;

[0015] The aeration unit includes a blower, an air inlet pipe, an air outlet pipe and an aeration pipe. The inlet of the blower is connected to the air collecting chamber through the air inlet pipe, the outlet of the blower is connected to the air outlet pipe, and the outlet of the air outlet pipe faces the B electrode. One end of the aeration pipe is connected to the air collecting chamber, and the other end is connected to the outside world.

[0016] Furthermore, the A electrode is used to be electrically connected to the positive electrode of the first power supply, and the B electrode is used to be electrically connected to the negative electrode of the first power supply;

[0017] The C electrode and the E electrode are both used to be electrically connected to the positive electrode of the second power supply, and the D electrode is used to be electrically connected to the negative electrode of the second power supply.

[0018] Furthermore, an electric heating module is installed on the outer surface of the E electrode or the inner wall of the plastic shell on a side away from the D electrode.

[0019] Furthermore, the gas collecting cavity is connected to an absorption box, and the absorption box is filled with quicklime particles.

[0020] Furthermore, the B electrode is provided with an aeration chamber, the outlet of the blower is connected to the aeration chamber through an air outlet pipe, a plurality of through holes are provided on the outer surface of the B electrode, and at least a part of the through holes on the outer surface of the B electrode is connected to the aeration chamber.

[0021] Furthermore, it also includes a water pipe and a water pump, one end of the water pipe is connected to the part between the A electrode and the B electrode in the processing chamber, and the other end of the water pipe is connected to the part between the D electrode and the plastic shell in the processing chamber, and the water pump is connected in series to the water pipe.

[0022] Furthermore, the distance between the A electrode and the B electrode is L1, the distance between the B electrode and the C electrode is L2, the distance between the C electrode and the D electrode is L3, and the distance between the D electrode and the E electrode is L4, and L1, L3 and L4 are all smaller than L2.

[0023] Furthermore, the potential difference between the A electrode and the B electrode is greater than the potential difference between the C electrode and the D electrode, and the potential difference between the A electrode and the B electrode is greater than the potential difference between the D electrode and the E electrode.

[0024] The beneficial effects of the present invention are as follows: the electrocatalytic treatment device for salt-containing organic wastewater of the present invention utilizes Fe 2+ The active oxidative species in the / HClO electrochemical system is Fe IV O 2+ , its redox potential is higher than that of HClO and Cl2· - (dichloro radical) is higher, but lower than Cl· - (chlorine radicals), thus effectively avoiding the formation of chlorinated by-products; the air diffusion cathode (B electrode) and the functionalized cathode (C electrode) can also interact at different optimal working current densities to achieve efficient H2O2 and reactive oxygen species production simultaneously.

[0025] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and examples.

[0027] Figure 1 It is a schematic diagram of the electrocatalytic treatment device for saline organic wastewater of the present invention.

[0028] In the figure: 1, treatment tank, 1-1, treatment chamber, 1-2, water inlet, 1-3, water outlet;

[0029] 4. Electrode A, 5. Electrode B, 5-1. Aeration chamber, 6. Electrode C, 7. Electrode D, 8. Electrode E;

[0030] 9. Plastic shell, 9-1. Inner cavity;

[0031] 10. Gas collecting chamber, 11. Blower, 12. Air inlet pipe, 13. Air outlet pipe, 14. Aeration pipe, 15. Electric heating module, 16. Absorption box, 17. Water pipe, 18. Water pump. DETAILED DESCRIPTION

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention only in a schematic manner. Therefore, they only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) may be used solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0033] like Figure 1 As shown, an electrocatalytic treatment device for saline organic wastewater includes a treatment tank 1 and an aeration unit. The treatment tank 1 has a treatment chamber 1-1. An inlet 1-2 is provided on the inner wall of one end of the treatment chamber 1-1, and an outlet 1-3 is provided on the inner wall of the other end. An electrode A 4, an electrode B 5, an electrode C 6, and an electrode D 7 are sequentially arranged in the treatment chamber 1-1 from the inlet 1-2 to the outlet 1-3.

[0034] The A electrode 4 is an anode, and includes an A electrode substrate made of titanium or titanium alloy and a ruthenium oxide layer, a lead oxide layer, or a composite layer of ruthenium oxide and lead oxide provided on the surface of the A electrode substrate. The A electrode 4 is used to generate chlorine gas on the surface of the A electrode 4 when energized.

[0035] Electrode B 5 is a cathode. Electrode B 5 is made of iron. The aeration unit is used to introduce air into electrode B 5 so that oxygen forms hydrogen peroxide around electrode B 5 after power is applied. Electrode B 5 is an air diffusion cathode.

[0036] The C electrode 6 is an anode. The material of the C electrode 6 is iron. The C electrode 6 is used to form ferrous ions and Fe IV O 2+ ; C electrode 6 is a functional cathode;

[0037] The D electrode 7 is a cathode. The material of the D electrode 7 is iron material, and can also be stainless steel. The D electrode 7 is used to react the hydrogen peroxide flowing through the D electrode 7 with ferrous ions to generate hydroxyl radicals after power is applied.

[0038] The saline organic wastewater in this embodiment refers to wastewater containing both organic matter and dissolved salts. It mainly comes from industrial production that directly utilizes seawater, domestic water, food processing plants, chemical plants, and the collection and processing of oil and natural gas. In addition to organic pollutants, these wastewaters also contain a large amount of inorganic salts, such as Cl - , SO4 2- , Na + , Ca 2+ Plasma.

[0039] The electrocatalytic treatment device for salt-containing organic wastewater uses electrode A 4 to make the chloride ions in the salt-containing organic wastewater generate chlorine on the surface of electrode A 4. The oxygen in the air from the aeration unit to electrode B 5 forms hydrogen peroxide around electrode B 5. Under the action of the electric field, electrode C 6 self-consumes to form ferrous ions. The chlorine generated by electrode A 4 dissolves in water to form HClO. When it flows to electrode C 6, HClO reacts with ferrous ions to generate Fe IV O 2+ , Fe IV O 2+ It has a high oxidation capacity, can oxidize organic matter in saline organic wastewater and avoid the production of chlorine-containing by-products. The iron is finally converted into trivalent iron, which has a certain flocculation effect to flocculate and precipitate particulate matter in the saline organic wastewater; at the same time, the hydrogen peroxide produced by the B electrode 5 and the ferrous ions produced by the C electrode 6 react to generate hydroxyl radicals. The hydroxyl radicals have a strong oxidation capacity and have a better oxidation effect on organic pollutants.

[0040] In some examples, an E electrode 8 and a plastic shell 9 are further provided in the processing chamber 1 - 1 , and the D electrode 7 and the E electrode 8 are arranged in sequence from the water inlet 1 - 2 to the water outlet 1 - 3 ;

[0041] The E-electrode 8 is an anode. The E-electrode 8 includes an E-electrode substrate made of titanium or titanium alloy and a ruthenium oxide layer, a lead oxide layer, or a composite layer of ruthenium oxide and lead oxide provided on the surface of the E-electrode substrate. The E-electrode 8 is used to generate chlorine gas on the surface of the E-electrode 8 when energized, by causing chloride ions in the saline organic wastewater to generate chlorine gas.

[0042] A plastic shell 9 is disposed in the treatment chamber 1-1. The plastic shell 9 has an inner cavity 9-1. A plurality of convection holes communicating with the treatment chamber 1-1 are penetrated on the inner wall of the inner cavity 9-1. The inner cavity 9-1 may have a plurality of convection holes communicating with the treatment chamber 1-1 on both inner walls from the water inlet 1-2 to the water outlet 1-3. When the saline organic wastewater enters the inner cavity 9-1 through the convection holes, the saline organic wastewater in the inner cavity 9-1 is disturbed, making it easy for chlorine generated around the E electrode 8 to escape from the surface of the E electrode 8. The E electrode 8 is disposed in the inner cavity 9-1. A gas collecting chamber 10 is formed between the upper end of the inner cavity 9-1 and the liquid surface of the saline organic wastewater in the inner cavity 9-1.

[0043] The aeration unit includes a blower 11, an air inlet pipe 12, an air outlet pipe 13 and an aeration pipe 14. The inlet of the blower 11 is connected to the gas collecting chamber 10 through the air inlet pipe 12, and the outlet of the blower 11 is connected to the air outlet pipe 13. The outlet of the air outlet pipe 13 faces the B electrode 5. One end of the aeration pipe 14 is connected to the gas collecting chamber 10, and the other end is connected to the outside world. In order to prevent the chlorine in the gas collecting chamber 10 from flowing out from the aeration pipe 14, a one-way valve can also be provided on the aeration pipe 14, and the outside air can enter the gas collecting chamber 10 through the one-way valve.

[0044] The E electrode 8 causes the chloride ions in the saline organic wastewater to generate chlorine gas on the surface of the A electrode 4. Part of the chlorine gas will gather in the gas collecting cavity 10 of the plastic shell 9. The blower 11 will send the air and chlorine gas in the gas collecting cavity 10 to the B electrode 5 through the air inlet pipe 12 and the air outlet pipe 13. In this way, when the chloride ion concentration in the saline organic wastewater is low, the chlorine gas generated around the E electrode 8 will continue to be used to the B electrode 5 to generate HClO, thereby generating more Fe IV O 2+ .

[0045] In some examples, the A electrode 4 is used to be electrically connected to the positive electrode of the first power source, and the B electrode 5 is used to be electrically connected to the negative electrode of the first power source;

[0046] The C electrode 6 and the E electrode 8 are both used to be electrically connected to the positive electrode of the second power supply, and the D electrode 7 is used to be electrically connected to the negative electrode of the second power supply. Both the first power supply and the second power supply are DC power supplies.

[0047] In some examples, an electric heating module 15 is installed on the outer surface of the E electrode 8 or the inner wall of the plastic shell 9 on the side away from the D electrode 7; the electric heating module 15 can be an electric heating tube, and the electric heating module 15 can heat the salt-containing organic wastewater in the plastic shell 9 to 30-60°C to prevent the chlorine in the plastic shell 9 from dissolving in water to form HClO, so that the chlorine formed by the E electrode 8 moves upward and gathers in the gas collecting cavity 10.

[0048] In some examples, the gas collecting chamber 10 is connected to an absorption box 16, which is filled with quicklime particles; when the blower 11 is not turned on, the chlorine gas generated by the gas collecting chamber 10 can be slowly absorbed by the quicklime particles in the absorption box 16; when the blower 11 is turned on, most of the chlorine gas generated by the gas collecting chamber 10 will be transported to the B electrode 5 together with the air by the blower.

[0049] In some examples, the B electrode 5 is provided with an aeration chamber 5-1, and the outlet of the blower 11 is connected to the aeration chamber 5-1 through the air outlet pipe 13. A plurality of through holes are provided on the outer surface of the B electrode 5, and at least a portion of the through holes on the outer surface of the B electrode 5 is connected to the aeration chamber 5-1, so that the air and chlorine can be relatively evenly dispersed at the B electrode 5;

[0050] In order to increase the fluidity of the saline organic wastewater in the treatment chamber 1 - 1 , the A electrode 4 , the B electrode 5 , the C electrode 6 , the D electrode 7 and the E electrode 8 may be provided with through holes.

[0051] In some examples, a water pipe 17 and a water pump 18 are further included. One end of the water pipe 17 is connected to a portion of the processing chamber 1-1 between the A electrode 4 and the B electrode 5, and the other end of the water pipe 17 is connected to a portion of the processing chamber 1-1 between the D electrode 7 and the plastic shell 9. The water pump 18 is connected in series to the water pipe 17.

[0052] The excess hydrogen peroxide between the D electrode 7 and the E electrode 8, that is, the hydrogen peroxide that has not been fully utilized, is passed through the water pump 18 to return a part of the salt-containing organic wastewater between the D electrode 7 and the E electrode 8 to between the A electrode 4 and the B electrode 5, thereby fully utilizing the hydrogen peroxide.

[0053] In some examples, the spacing between the A electrode 4 and the B electrode 5 is L1, which may be 5cm-10cm, the spacing between the B electrode 5 and the C electrode 6 is L2, which may be 20cm-40cm, the spacing between the C electrode 6 and the D electrode 7 is L3, which may be 5cm-10cm, and the spacing between the D electrode 7 and the E electrode 8 is L4, which may be 5cm-10cm. L1, L3 and L4 are all smaller than L2.

[0054] In some examples, the potential difference between the A electrode 4 and the B electrode 5 is greater than the potential difference between the C electrode 6 and the D electrode 7 , and the potential difference between the A electrode 4 and the B electrode 5 is greater than the potential difference between the D electrode 7 and the E electrode 8 ;

[0055] The potential difference between the A electrode 4 and the B electrode 5 may be 55V to 75V, the potential difference between the C electrode 6 and the D electrode 7 may be 25V to 35V, and the potential difference between the D electrode 7 and the E electrode 8 may be 25V to 35V.

[0056] The working principle of the electrocatalytic treatment device for the above-mentioned saline organic wastewater is as follows:

[0057] Organic wastewater continuously enters the treatment chamber 1-1 from the water inlet 1-2, passes through the A electrode 4, the B electrode 5, the C electrode 6, the D electrode 7 and the E electrode 8 in sequence, and finally flows out from the water outlet 1-3;

[0058] When the saline organic wastewater passes through electrode A 4, the chloride ions in the saline organic wastewater generate chlorine on the surface of electrode A 4; the oxygen in the air from the aeration unit to electrode B 5 forms hydrogen peroxide around electrode B 5, and electrode C 6 self-consumes to form ferrous ions under the action of the electric field. The chlorine generated by electrode A 4 dissolves in water to form HClO, and when it flows to electrode C 6, HClO reacts with ferrous ions to generate Fe IV O 2+, Fe IV O 2+ It has a high oxidation capacity and can oxidize organic matter in saline organic wastewater while avoiding the generation of chlorine-containing by-products. The iron is finally converted into trivalent iron, which has a certain flocculation effect, so as to flocculate and precipitate the particulate matter in the saline organic wastewater. At the same time, the hydrogen peroxide produced by the B electrode 5 and the ferrous ions produced by the C electrode 6 react to generate hydroxyl radicals. The hydroxyl radicals have a strong oxidation capacity and have a better oxidation effect on organic pollutants. As a result, the organic matter in the saline organic wastewater is removed through multiple oxidation processes, and the chloride ions are converted into chlorine gas and absorbed and removed.

[0059] The E electrode 8 causes the chloride ions in the saline organic wastewater to generate chlorine gas on the surface of the A electrode 4. Part of the chlorine gas will gather in the gas collecting cavity 10 of the plastic shell 9. The blower 11 will send the air and chlorine gas in the gas collecting cavity 10 to the B electrode 5 through the air inlet pipe 12 and the air outlet pipe 13. In this way, when the chloride ion concentration in the saline organic wastewater is low, the chlorine gas generated around the E electrode 8 will continue to be used to the B electrode 5 to generate HClO, thereby generating more Fe IV O 2 ;

[0060] As a result, the organic matter in the saline organic wastewater is removed through multiple oxidations, and the chloride ions are converted into chlorine gas and absorbed and removed.

[0061] The above description of the preferred embodiments of the present invention is intended to serve as a guide. Based on the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. An electrocatalytic treatment device for saline organic wastewater, characterized by: The invention comprises a treatment tank (1) and an aeration unit, wherein the treatment tank (1) has a treatment chamber (1-1), a water inlet (1-2) is provided on the inner wall of one end of the treatment chamber (1-1), and a water outlet (1-3) is provided on the inner wall of the other end of the treatment chamber (1-1), and an A electrode (4), a B electrode (5), a C electrode (6) and a D electrode (7) are sequentially arranged in the treatment chamber (1-1) along the direction from the water inlet (1-2) to the water outlet (1-3); The A electrode (4) is an anode, and the A electrode (4) comprises an A electrode substrate made of titanium or a titanium alloy and a ruthenium oxide layer or a lead oxide layer provided on the surface of the A electrode substrate. The A electrode (4) is used to generate chlorine gas on the surface of the A electrode (4) from chloride ions in the salt-containing organic wastewater after power is applied. The B electrode (5) is a cathode, and the material of the B electrode (5) is an iron material. The aeration unit is used to introduce air into the B electrode (5), so that oxygen forms hydrogen peroxide around the B electrode (5) after the B electrode (5) is energized; The C electrode (6) is an anode, and the material of the C electrode (6) is an iron material. The C electrode (6) is used to form ferrous ions after being energized, and to form Fe IV O 2+ ; The D electrode (7) is a cathode, and the D electrode (7) is used to react hydrogen peroxide and ferrous ions flowing through the D electrode (7) to generate hydroxyl radicals after power is applied; An E electrode (8) and a plastic shell (9) are also provided in the treatment chamber (1-1), and the D electrode (7) and the E electrode (8) are arranged in sequence along the direction from the water inlet (1-2) to the water outlet (1-3); The E electrode (8) is an anode. The E electrode (8) includes an E electrode substrate made of titanium or titanium alloy and a ruthenium oxide layer or a lead oxide layer provided on the surface of the E electrode substrate. The E electrode (8) is used to generate chlorine gas on the surface of the E electrode (8) from chloride ions in the saline organic wastewater after power is applied. The plastic shell (9) is arranged in the processing chamber (1-1), the plastic shell (9) has an inner cavity (9-1), the inner wall of the inner cavity (9-1) is penetrated by a plurality of convection holes connected to the processing chamber (1-1), the E electrode (8) is arranged in the inner cavity (9-1), and a gas collecting chamber (10) is formed between the upper end of the inner cavity (9-1) and the liquid surface of the salt-containing organic wastewater in the inner cavity (9-1); The aeration unit comprises a blower (11), an air inlet pipe (12), an air outlet pipe (13) and an aeration pipe (14); the inlet of the blower (11) is connected to the air collecting chamber (10) through the air inlet pipe (12); the outlet of the blower (11) is connected to the air outlet pipe (13); the outlet of the air outlet pipe (13) faces the B electrode (5); one end of the aeration pipe (14) is connected to the air collecting chamber (10), and the other end is connected to the outside.

2. The electrocatalytic treatment device for saline organic wastewater according to claim 1, characterized in that: The A electrode (4) is used to be electrically connected to the positive electrode of the first power supply, and the B electrode (5) is used to be electrically connected to the negative electrode of the first power supply; The C electrode (6) and the E electrode (8) are both used to be electrically connected to the positive electrode of the second power supply, and the D electrode (7) is used to be electrically connected to the negative electrode of the second power supply.

3. The electrocatalytic treatment device for saline organic wastewater according to claim 1, characterized in that: An electric heating module (15) is installed on the outer surface of the E electrode (8) or the inner wall of the plastic shell (9) on a side away from the D electrode (7).

4. The electrocatalytic treatment device for saline organic wastewater according to claim 1, characterized in that: The gas collecting cavity (10) is connected to an absorption box (16), and the absorption box (16) is filled with quicklime particles.

5. The electrocatalytic treatment device for saline organic wastewater according to claim 1, characterized in that: The B electrode (5) is provided with an aeration chamber (5-1), the outlet of the blower (11) is connected to the aeration chamber (5-1) via an air outlet pipe (13), a plurality of through holes are provided on the outer surface of the B electrode (5), and at least a portion of the through holes on the outer surface of the B electrode (5) is connected to the aeration chamber (5-1).

6. The electrocatalytic treatment device for saline organic wastewater according to claim 1, characterized in that: It also includes a water pipe (17) and a water pump (18), one end of the water pipe (17) is connected to a portion of the processing chamber (1-1) between the A electrode (4) and the B electrode (5), and the other end of the water pipe (17) is connected to a portion of the processing chamber (1-1) between the D electrode (7) and the plastic shell (9), and the water pump (18) is connected in series to the water pipe (17).

7. The electrocatalytic treatment device for saline organic wastewater according to claim 1, characterized in that: The distance between the A electrode (4) and the B electrode (5) is L1, the distance between the B electrode (5) and the C electrode (6) is L2, the distance between the C electrode (6) and the D electrode (7) is L3, and the distance between the D electrode (7) and the E electrode (8) is L4. L1, L3 and L4 are all smaller than L2.

8. The electrocatalytic treatment device for saline organic wastewater according to claim 1, characterized in that: The potential difference between the A electrode (4) and the B electrode (5) is greater than the potential difference between the C electrode (6) and the D electrode (7), and the potential difference between the A electrode (4) and the B electrode (5) is greater than the potential difference between the D electrode (7) and the E electrode (8).

Images