A microbial fuel cell coupled with a constructed wetland series electrolytic cell device

Abstract

The application discloses a microbial fuel cell coupled artificial wetland series electrolytic cell device, which comprises a shell, an artificial wetland unit, a microbial fuel cell unit and a calcium carbonate electrolytic cell unit. The artificial wetland unit comprises a water distribution layer and an intermediate substrate layer which are sequentially laid in the shell from bottom to top, and plants are planted in the intermediate substrate layer; a water inlet is arranged at the bottom of one side of the water distribution layer; the microbial fuel cell unit comprises an anode layer and a cathode layer, the anode layer and the cathode layer are electrically connected through an external circuit, the anode layer is located between the water distribution layer and the intermediate substrate layer, the cathode layer is located above the intermediate substrate layer, the top of the plants penetrates through the cathode layer and extends out of the shell, and a water outlet is arranged above the cathode layer; the electrolytic cell unit comprises an electrode and a calcium carbonate flow bed. The microbial fuel cell unit, the artificial wetland unit and the electrolytic cell unit are coupled, the electric energy of the microbial fuel cell unit is reasonably utilized, common pollutants such as total phosphorus are efficiently removed, new pollutants such as antibiotics and resistance genes can be removed, and more economical and environment-friendly environmental remediation is realized.

Description

Technical Field

[0001] This invention relates to the field of water pollution control technology, and in particular to a microbial fuel cell coupled with an artificial wetland series electrolysis cell device, which is suitable for the purification and treatment of water containing complex pollutants such as nitrogen, phosphorus, organic matter and antibiotics. Background Technology

[0002] Microbial fuel cells can simultaneously treat pollutants and recover electricity through the action of electrogenic bacteria, making them an environmentally friendly pollution control technology. They use microorganisms as the anode catalyst and consist of a bioanode and a chemical annode. However, conventional microbial fuel cells require the artificial preparation of a biological nutrient solution to maintain the activity of the electrogenic microorganisms, and the power generation voltage is generally less than 2 volts, limiting their application scenarios.

[0003] Constructed wetlands have become a commonly used technology for water treatment due to their advantages such as ease of construction, low cost, and environmental friendliness. They can remove common pollutants in water bodies through the synergistic effect of microorganisms, plants, and substrates. Vertical flow constructed wetlands, in particular, have the potential to remove both common and emerging pollutants. However, constructed wetlands operating alone are not very effective at removing complex pollutants such as heavy metal ions and antibiotics, and the naturally occurring electrogenic bacteria and electrolytes within the wetland are not effectively utilized, resulting in low resource utilization.

[0004] Electrolytic cell technology can remove environmental pollutants by ionizing or electrocatalyzing active materials. It can also precipitate oxyacid anions by electrolyzing specific substances (such as precipitating phosphate anions by releasing calcium ions during electrolysis), showing good removal efficiency for high-concentration pollutants. However, standalone electrolytic cells require additional power, resulting in high operating costs, and their removal efficiency for low-concentration pollutants is relatively low. To address this, a high-efficiency pollution removal device combining a microbial fuel cell with a constructed wetland and a series electrolytic cell is proposed.

[0005] To address the shortcomings of single devices in existing technologies, this invention couples and connects microbial fuel cells, constructed wetlands, and electrolysis cells in series, integrating their advantages to solve problems such as limited pollution removal capacity, low resource utilization, and high operating costs of single devices, thereby achieving efficient removal of complex pollutants and energy self-sufficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a microbial fuel cell coupled with an artificial wetland and a series electrolyzer device, which integrates the technical advantages of microbial fuel cells, artificial wetlands, and electrolyzers to achieve simultaneous and efficient removal of common pollutants such as nitrogen, phosphorus, and organic matter, as well as new pollutants such as antibiotics and resistance genes in water bodies. At the same time, the microbial fuel cell provides energy to the electrolyzer by itself, eliminating the need for an additional power supply, reducing operating costs, and improving the economic efficiency and environmental friendliness of environmental remediation.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A high-efficiency decontamination device for microbial fuel cell coupled with constructed wetland series electrolysis cell includes a first shell, a second shell, a constructed wetland unit, a microbial fuel cell unit, and an electrolysis cell unit;

[0009] The first housing has a first water inlet at the bottom and a water outlet at the top; the second housing has a second water inlet at the bottom, which is connected to the water outlet of the first housing; the constructed wetland unit and the microbial fuel cell unit are both housed within the first housing, and the electrolytic cell unit is housed within the second housing; a first water distribution layer is laid at the bottom of the first housing, and above the first water distribution layer, from bottom to top, are arranged the anode layer of the microbial fuel cell unit, the intermediate matrix layer of the constructed wetland unit, and the cathode layer of the microbial fuel cell unit; emergent plants are planted in the intermediate matrix layer, with the tops of the plants penetrating the cathode layer and extending beyond the first housing; nylon cloth is laid on both the upper and lower sides of the intermediate matrix layer to separate the matrix from the electrode layer and ensure water permeability; the microorganisms... The anode and cathode layers of the fuel cell unit are electrically connected via an external circuit, which forms a closed loop with the electrolytic cell unit to supply power to the electrolytic cell unit. The electrolytic cell unit includes, from bottom to top, a second water distribution layer, electrodes, a calcium carbonate fluidized bed, and a return flow device. The second water distribution layer is connected to a second water inlet and is also connected to an air inlet to mix water and air before feeding them into the fluidized bed. The electrodes are immersed in the calcium carbonate fluidized bed and are electrically connected to the external circuit. The calcium carbonate fluidized bed is filled with calcium carbonate powder. The return flow device includes an external mechanical housing and an internal filter element. A filter membrane is laid at the front end of the filter element. The return flow device is used to separate the effluent from the calcium carbonate fluidized bed, discharge the clarified liquid from the device, and simultaneously return the solid matter to the calcium carbonate fluidized bed.

[0010] Preferably, the anode layer includes a plurality of anode graphite particles and a composite electrode of anode carbon felt and titanium wire, the composite electrode of anode carbon felt and titanium wire being laid between the anode graphite particles, and the anode graphite particles being laid entirely between the first water distribution layer and the intermediate matrix layer; the cathode layer includes a plurality of cathode graphite particles and a composite electrode of cathode carbon felt and titanium wire, the composite electrode of cathode carbon felt and titanium wire being laid between the cathode graphite particles, and the cathode graphite particles being laid entirely above the intermediate matrix layer; the composite electrode of anode carbon felt and titanium wire and the composite electrode of cathode carbon felt and titanium wire are electrically connected through an external circuit, and the top of the emergent plant extends out of the first shell sequentially through the cathode graphite particles and the composite electrode of cathode carbon felt and titanium wire.

[0011] Preferably, the external circuit includes a cathode wire, an anode wire, a voltage workstation, and a variable resistor; the anode wire is electrically connected to the anode carbon felt-titanium wire composite electrode, and the cathode wire is electrically connected to the cathode carbon felt-titanium wire composite electrode; both the cathode wire and the anode wire extend out of the first housing and are both electrically connected to the voltage workstation; the variable resistor is connected in parallel with the voltage workstation and is electrically connected to the electrodes of the electrolytic cell unit, used to measure the internal resistance of the device and adjust the circuit voltage; both the cathode wire and the anode wire are made of inert copper wire.

[0012] Preferably, both the first and second water distribution layers are made of porous corrosion-resistant materials with a thickness of 0.5-5cm. Their function is to uniformly disperse the water flow and reduce the water flow velocity. The second water distribution layer can also achieve full mixing of water flow and air flow, providing power for the mixing of materials in the calcium carbonate fluidized bed.

[0013] Preferably, the thickness of the anode graphite particles and the cathode graphite particles is 2-10 cm, and the particle size is 1-8 mm; the thickness of the intermediate matrix layer is 10-30 cm; the thickness of the calcium carbonate fluidized bed is 5-50 cm, and the particle size of the calcium carbonate powder and calcium phosphate powder filled in it is ≤ 2 mm.

[0014] Preferably, the plant is a canna lily, whose roots penetrate deep into the intermediate matrix layer and can pass through the gap between the anode layer and the cathode layer, delivering oxygen to each level of the device, enhancing the pollutant removal effect and the power generation efficiency of the electrogenic microorganisms. At the same time, the plant roots can enhance the structural stability of each packing layer of the device.

[0015] Preferably, the first shell is made of plexiglass, and the outside of the first shell is wrapped with aluminum foil to block light and prevent detection interference caused by photodegradation of pollutants such as antibiotics. At the same time, it simulates the lightless matrix environment of natural wetlands to ensure the normal growth of electrogenic microorganisms.

[0016] Preferably, the air inlet can be connected to an external pressurized reflux water pump. Both the pressurized reflux water pump and the air inlet device can achieve the mixing of liquid in the calcium carbonate fluidized bed, and can be switched according to actual operating requirements.

[0017] This invention discloses the following technical effects: Wastewater is introduced into the first housing through the first inlet, and then passes through the first water distribution layer, the anode layer, the intermediate matrix layer, and the cathode layer in sequence, finally flowing out through the outlet. Common pollutants in the wastewater can be removed through the anode layer, the cathode layer, the intermediate matrix layer, and plants. The anode layer is rich in electrogenic microorganisms, and the growth of plants will simultaneously stimulate the growth of electrogenic microorganisms. Organic pollutants in the wastewater provide carbon sources for microorganisms, thereby avoiding the need for additional microbial nutrient solution to maintain electrogenic microorganisms. Electrogenic microorganisms will attach to the anode and cathode layers. Electrogenic microorganisms in and around the anode layer will oxidize organic pollutants and generate electrons. Using the potential difference provided by the microbial fuel cell, calcium ions in the calcium carbonate fluidized bed are driven to release, which combine with phosphate ions in the wastewater to form calcium phosphate precipitate, removing phosphate ions, antibiotics, and other complex pollutants from the wastewater, thus completing the pollutant removal process, as well as the electricity generation and utilization process. This invention couples a microbial fuel cell unit, an artificial wetland unit, and an electrolysis cell unit, integrating the advantages of all three. It can not only remove common pollutants but also remove new pollutants such as antibiotics, improving pollutant removal capabilities. At the same time, it enhances the activity of electrogenic microorganisms in the artificial wetland, thereby increasing the power generation capacity of the microbial fuel cell and achieving a more economical input-output ratio. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the processing system provided in an embodiment of the present invention;

[0020] Figure 2 This is a data distribution diagram showing the removal rate of sulfadiazine according to the present invention;

[0021] Figure 3 This is a data distribution diagram of the generated voltage in this invention;

[0022] Figure 4 This is a data distribution diagram of the chemical oxygen demand removal rate according to the present invention;

[0023] Figure 5 This is a data distribution diagram of the total phosphorus removal rate according to the present invention;

[0024] Figure 6 This is a data distribution diagram of the total nitrogen removal rate according to the present invention.

[0025] In the diagram: 1. First shell; 2. First inlet; 3. Outlet; 4. Second shell; 5. Second inlet; 6. First water distribution layer; 7. Intermediate matrix layer; 8. Plant; 9. Anode layer; 10. Cathode layer; 11. Second water distribution layer; 12. Electrode; 13. Flow bed; 14. Recirculator; 15. Air inlet; 16. Anode graphite particles; 17. Anode carbon felt and titanium wire composite electrode; 18. Cathode graphite particles; 19. Cathode carbon felt and titanium wire composite electrode; 20. Calcium carbonate powder; 21. Calcium phosphate powder; 22. External mechanical shell; 23. Internal filter element; 24. Cathode wire; 25. Anode wire; 26. Voltage workstation; 27. Nylon cloth; 28. Filter membrane. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figure 1 This invention provides a microbial fuel cell coupled with an artificial wetland series electrolyzer device, comprising:

[0029] The first housing 1 is made of plexiglass and wrapped with aluminum foil. It has a first water inlet 2 at the bottom and a water outlet 3 at the top. The second housing 4 has a second water inlet 5 at the bottom, and the second water inlet 5 and the water outlet 3 are connected by a pipe.

[0030] The bottom of the first shell 1 is covered with a first water distribution layer 6 with a thickness of 2 cm. Above the first water distribution layer 6, anode graphite particles 16 with a thickness of 5 cm and a particle size of 3-8 mm are laid. Anode carbon felt and titanium wire composite electrode 17 are laid between the anode graphite particles 16 to form the anode layer 9.

[0031] A nylon cloth 27 is laid on top of the anode layer 9. A 20 cm thick intermediate matrix layer 7 is laid on top of the nylon cloth 27. Canna lilies (plant 8) are planted in the intermediate matrix layer 7, and the roots of the canna lilies penetrate into the intermediate matrix layer 7. Another layer of nylon cloth 27 is laid on top of the intermediate matrix layer 7. A cathode graphite particles 18 with a thickness of 5 cm and a particle size of 3-8 mm are laid on top of the nylon cloth 27. A cathode carbon felt and titanium wire composite electrode 19 is laid between the cathode graphite particles 18 to form the cathode layer 10.

[0032] The cathode carbon felt and titanium wire composite electrode 19 is connected to the cathode wire 24, and the anode carbon felt and titanium wire composite electrode 17 is connected to the anode wire 25. Both the cathode wire 24 and the anode wire 25 extend out of the first housing 1 and are connected to the voltage workstation 26. The variable resistor is connected in parallel with the voltage workstation 26 and is connected to the electrode 12 inside the second housing 4.

[0033] The bottom of the second housing 4 is covered with a second water distribution layer 11 with a thickness of 2 cm. The second water distribution layer 11 is connected to the second water inlet 5 and is connected to the air inlet 15. An electrode 12 (titanium column composite graphite carbon felt) is set above the second water distribution layer 11. The electrode 12 is immersed in a calcium carbonate fluidized bed 13 with a thickness of 30 cm and is filled with calcium carbonate powder 20 with a particle size ≤ 2 mm. A return flow device 14 is set above the calcium carbonate fluidized bed 13. A filter membrane 28 is laid at the front end of the internal filter element 23 of the return flow device 14.

[0034] Artificially prepared wastewater containing antibiotics, nitrogen, phosphorus, and organic matter, meeting the national Class V wastewater standard, is introduced into the first shell through the first inlet. The wastewater sequentially passes through the first water distribution layer, the anode layer, the intermediate matrix layer, and the cathode layer, finally flowing out through the outlet. The intermediate matrix layer and plants remove common pollutants from the wastewater. The intermediate matrix layer is rich in electrogenic microorganisms, and the growth of the plants simultaneously stimulates the growth of these microorganisms. Organic pollutants in the wastewater provide a carbon source for the microorganisms, thus eliminating the need for additional nutrient solutions to maintain them. The electrogenic microorganisms attach to the anode and cathode layers. In the anode layer and its vicinity, these microorganisms oxidize organic pollutants and generate electrons. These electrons travel through the external circuit to the cathode layer, thereby removing pollutants from the wastewater and completing both the pollutant removal and electricity generation processes. The potential difference between the anode and cathode layers provides energy to the electrolytic cell electrodes, promoting the reaction of calcium carbonate and phosphate ions in the fluidized bed to produce calcium phosphate. This invention couples a microbial fuel cell unit, an artificial wetland unit, and an electrolyzer, integrating the advantages of all three. It can not only remove common pollutants but also complex pollutants such as antibiotics, improving pollutant removal capacity. At the same time, it enhances the activity of electrogenic microorganisms in the artificial wetland, thereby increasing the power generation capacity of the microbial fuel cell and achieving a more economical input-output ratio.

[0035] Further optimization schemes include the first water distribution layer (6) and water distributor 2 (11) having a thickness of 0.5-5cm, made of corrosion-resistant material with a porous structure, including but not limited to reducing the thickness of water distributor 1 (6) and water distributor 2 (11) by improving it to a shower-type water distributor.

[0036] Further optimization involves wastewater flowing into the first water distribution layer from the first inlet. This layer reduces the wastewater flow velocity and disperses the flow direction. Water emanating from the first shell flows into the second water distribution layer from the second inlet of the second shell. This second layer, while reducing the wastewater flow velocity, mixes water and air, providing power for material mixing within the fluidized bed. The air intake device (not shown in the figure) can be replaced with a pressurized reflux pump (not shown in the figure). Both the air intake device and the pressurized reflux pump have the ability to mix liquids within the fluidized bed.

[0037] The scheme is further optimized. The anode layer includes several anode graphite particles and a composite electrode of anode carbon felt and titanium wire. The composite electrode of anode carbon felt and titanium wire is laid between several anode graphite particles. Several anode graphite particles are laid between water distributor 1 and intermediate matrix layer.

[0038] The cathode layer includes several cathode graphite particles 9 and cathode carbon felt and titanium wire composite electrode 19. The cathode carbon felt and titanium wire composite electrode 19 is laid between several cathode graphite particles 9. Several cathode graphite particles 9 are laid on top of the intermediate matrix layer. Anode carbon felt and titanium wire composite electrode 8 and cathode carbon felt and titanium wire composite electrode 19 are electrically connected through an external circuit. Several cathode graphite particles 9 and cathode carbon felt and titanium wire composite electrode 19 pass through the top of the plant 8. The water outlet 3 is located above several cathode graphite particles 9.

[0039] Using a composite electrode of carbon felt and titanium wire as the anode and cathode can increase the contact area between the electrode and water pollutants and electrogenic microorganisms. The graphite particles expand the specific surface area of ​​the actual electrode, allowing more microorganisms to attach to the electrode, thereby improving power generation efficiency. Moreover, the cathode graphite particles 9 and the anode graphite particles 7 exist in particle form and will not hinder the growth of plants 8.

[0040] The scheme is further optimized so that the intermediate matrix layer includes a second soil layer, which is located between a number of anode graphite particles 7 and a number of cathode graphite particles 9, and the plant 8 is planted in the second soil layer.

[0041] The second soil layer, serving as the growth substrate for plant 8, provides a more natural growth environment for plant 8 and microorganisms, which is conducive to their growth. The natural soil substrate allows for a wider range of plant 8 options and a longer operating time, thereby improving the removal efficiency of pollutants in wastewater.

[0042] In a further optimized design, the external circuit includes a cathode wire 12 and an anode wire 13. The anode wire 13 is electrically connected to the anode carbon felt and titanium wire composite electrode 8, and the cathode wire 12 is electrically connected to the cathode carbon felt and titanium wire composite electrode 19. Both the cathode wire 12 and the anode wire 13 extend outside the first housing and are electrically connected to a voltage workstation 26. A variable resistor 15 is electrically connected between the anode wire 13 and the cathode wire 12. The variable resistor 15 is connected in parallel with the voltage workstation 26. The parallel connection of the voltage workstation 26 and the variable resistor 15 can measure the internal resistance of the device. In this embodiment, the cathode wire 12 and the anode wire 13 are inert copper wires.

[0043] The scheme was further optimized so that the roots of the plant penetrated the second soil layer, several anode graphite particles 7 and anode carbon felt and titanium wire composite electrode 8 in sequence, and extended into the gravel layer 5.

[0044] The roots of plant 8 carry oxygen to all levels, enhancing the removal of pollutants and the efficiency of power generation. At the same time, the roots of plant 8 will enhance the stability of each layer of the device.

[0045] Further optimization of the scheme: the thickness of the anode graphite particles 7 is 2-6cm, the thickness of the cathode graphite particles 9 is 2-6cm, and the thickness of the gravel layer 5 is 1-5cm.

[0046] The thickness of each filler layer can be adjusted according to the pollutants that need to be removed. If more reducing substances need to be removed, the thickness of the anode graphite particles 7 can be increased. If more oxidizing substances need to be removed, the thickness of the cathode graphite particles 9 can be increased. If more common pollutants need to be removed by the intermediate matrix layer and plants 8, the thickness of the second soil layer can be increased.

[0047] Further optimization of the scheme resulted in gravel particles of 2-8mm in gravel layer 5.

[0048] Further optimization of the scheme resulted in cathode graphite particles 9 and anode graphite particles 7 having a particle size of 3-8 mm.

[0049] To further optimize the scheme, nylon cloth is laid between the gravel layer 5 and the first soil layer, between the first soil layer and several anode graphite particles 7, between several anode graphite particles 7 and the second soil layer, and between the second soil layer and several cathode graphite particles 9; thereby increasing the stability of each layer.

[0050] A certain concentration of sulfadiazine antibiotic, potassium nitrate, ammonium chloride, potassium dihydrogen phosphate, and sodium acetate are added to artificially prepared wastewater. The prepared wastewater is then pumped into the first shell (1) through the first inlet (2) via an external peristaltic pump (not shown in the figure), and finally flows out through the outlet (3) into the fluidized bed (13) in the second shell (4). Finally, it enters the return flow device (14), where the turbid liquid returns to the fluidized bed and the clear liquid leaves the device. The operating cycle is about 120 days. Within 20 days, the antibiotic removal rate can reach 97%; the power generation voltage can reach 900mV; the chemical oxygen demand (COD) removal rate reaches 97%; the total phosphorus (TP) removal rate reaches 97%; the total nitrogen (TN) removal rate reaches 97%, and the plants (8) can grow stably.

[0051] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0052] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A microbial fuel cell coupled with an artificial wetland series electrolyzer device, characterized in that, include: A first housing, having a first water inlet at the lower part and a water outlet at the upper part; The second housing has a second water inlet at its lower part; The bottom of the first housing is provided with a water distribution layer, and an anode layer, an intermediate matrix layer and a cathode layer are arranged sequentially above the water distribution layer; plants are planted in the intermediate matrix layer, and the top of the plants penetrates the cathode layer and extends out of the first housing; the anode layer and the cathode layer are connected to the electrolytic cell unit through an external circuit to form a circuit. The electrolytic cell unit is disposed within the first housing and includes a water distribution layer, electrodes, a fluidized bed, and a return flow device. The water distribution layer is connected to the water outlet and the second water inlet, and is connected to the air inlet. The electrodes are immersed in the fluidized bed and are connected to the microbial fuel cell unit through an external circuit to form a loop. The return flow device is used to separate the clarified liquid and return the solid matter to the fluidized bed.

2. The microbial fuel cell coupled with an artificial wetland series electrolyzer device according to claim 1, characterized in that: The first and second water distribution layers are both made of porous corrosion-resistant materials, with a thickness of 0.5-5 cm; the anode graphite particles and cathode graphite particles are laid with a thickness of 2-10 cm and a particle size of 1-8 mm.

3. The microbial fuel cell coupled with an artificial wetland series electrolyzer device according to claim 1, characterized in that: The thickness of the intermediate matrix layer is 10-30 cm; the thickness of the calcium carbonate fluidized bed is 5-50 cm; and the particle size of the calcium carbonate powder is ≤2 mm.

4. The microbial fuel cell coupled with an artificial wetland series electrolyzer device according to claim 1, characterized in that: The first housing is made of plexiglass, and the outside of the first housing is wrapped with aluminum foil.

5. The microbial fuel cell coupled with an artificial wetland series electrolyzer device according to claim 1, characterized in that: The air inlet can be connected to an external pressurized reflux water pump to achieve homogenization of the liquid in the calcium carbonate fluidized bed.

6. The microbial fuel cell coupled with an artificial wetland series electrolyzer device according to claim 1, characterized in that: The plant root system passes through the cathode layer, several cathode graphite particles, the cathode carbon felt and titanium wire composite electrode, and the intermediate matrix layer in sequence at the bottom.

7. The microbial fuel cell coupled with an artificial wetland series electrolyzer device according to claim 1, characterized in that: The anode layer includes a plurality of anode graphite particles and anode carbon felt and titanium wire composite electrodes, wherein the anode carbon felt and titanium wire composite electrodes are laid between the anode graphite particles, and the anode graphite particles are laid between the first water distribution layer and the intermediate matrix layer.

8. The microbial fuel cell coupled with an artificial wetland series electrolyzer device according to claim 1, characterized in that: The external circuit includes a cathode wire, an anode wire, a voltage workstation, and a variable resistor; the anode wire is electrically connected to the anode carbon felt-titanium wire composite electrode, and the cathode wire is electrically connected to the cathode carbon felt-titanium wire composite electrode; both the cathode wire and the anode wire extend out of the first housing and are electrically connected to the voltage workstation; the variable resistor is connected in parallel with the voltage workstation and is electrically connected to the electrodes of the electrolytic cell unit; both the cathode wire and the anode wire are inert copper wires.

9. The microbial fuel cell coupled with an artificial wetland series electrolyzer device according to claim 1, characterized in that: The anode carbon felt and titanium wire composite electrode and the cathode carbon felt and titanium wire composite electrode are electrically connected through an external circuit.

10. The device for coupling a microbial fuel cell with an artificial wetland series electrolyzer according to claim 1, characterized in that: The wastewater to be purified passes sequentially through the first water distribution layer, the anode layer, the intermediate matrix layer, the cathode layer, the second water distribution layer, the fluidized bed, and the return flow device. Nylon cloth is laid on both the upper and lower sides of the intermediate matrix layer, and a filter membrane is laid at the front end of the filter element inside the return flow device.

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