Sewage zero discharge treatment device

Abstract

The invention discloses a sewage zero discharge treatment device which comprises a sewage treatment tank, a first partition plate, a second partition plate, a third partition plate and a fourth partition plate are arranged in the sewage treatment tank, a closed area between the third partition plate and the fourth partition plate forms a collection pool, and a rotating magnetic field device is arranged on the periphery of an anaerobic pool. The rotating magnetic field device generates a rotating magnetic field, ferroferric oxide nanoparticles with the surfaces modified with sulfonic acid groups exist in the anaerobic tank, the ferroferric oxide nanoparticles have superparamagnetism and are driven by the rotating magnetic field to form a directional vortex flow, and the ferroferric oxide nanoparticles adsorb protons and load anaerobic microorganisms. A magnetic biological membrane is formed, meanwhile, the mixed mass transfer efficiency of microorganisms and sewage is enhanced through the directional vortex flow, an ultrasonic vibrator array is arranged at the bottom of the aerobic tank, and a collecting device is arranged above the sewage treatment tank.

Description

Technical Field

[0001] The present invention relates to the technical field of zero-carbon cabin sewage treatment, and in particular to a sewage zero-discharge treatment device. Background Art

[0002] With the growing global emphasis on sustainable development, zero-carbon buildings, such as zero-carbon cabins, are becoming a focal point in urban and rural development as key vehicles for green, low-carbon living. Zero-carbon cabins emphasize energy self-sufficiency, resource recycling, and zero carbon emissions. Their core approach is to achieve a closed energy and material loop within and outside the building through renewable energy technologies and efficient energy-saving systems. In this scenario, wastewater treatment, as a key component of resource utilization, urgently requires a solution that is highly aligned with zero-carbon goals.

[0003] While traditional wastewater treatment technologies can effectively remove pollutants, they rely on external grid-powered aeration and pumping equipment, resulting in high energy consumption and significant carbon emissions. Furthermore, conventional processes struggle to recycle organic matter in wastewater, failing to meet the dual requirements of zero-carbon cabins: energy self-sufficiency and zero wastewater discharge. Summary of the Invention

[0004] In view of the above-mentioned prior art, the present invention provides a sewage zero-discharge treatment device, which mainly solves the technical problems existing in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the technical solution of the embodiment of the present invention is implemented as follows:

[0006] A zero-discharge sewage treatment device comprises a sewage treatment tank, wherein a first baffle, a second baffle, a third baffle, and a fourth baffle are provided in the sewage treatment tank; a closed area formed on one side of the first baffle is an anaerobic tank; a closed area between the second baffle and the third baffle forms an aerobic tank; a closed area between the second baffle and the third baffle forms a filtration tank; and a closed area between the third baffle and the fourth baffle forms a collection tank; a rotating magnetic field device is provided on the periphery of the anaerobic tank, the rotating magnetic field device generates a rotating magnetic field; ferroferric oxide nanoparticles with surface modified sulfonic acid groups are present in the anaerobic tank; the ferroferric oxide nanoparticles have superparamagnetism and are driven by the rotating magnetic field to form a directional vortex flow; the ferroferric oxide nanoparticles adsorb protons and load anaerobic microorganisms to form a magnetic biofilm; and the directional vortex flow enhances the mixing and mass transfer efficiency of the microorganisms and sewage; an ultrasonic vibrator array is provided at the bottom of the aerobic tank, and a collection device is provided above the sewage treatment tank.

[0007] Optionally, a first anode is provided in the anaerobic tank, and a first cathode is provided in the aerobic tank. One end of the first anode and the first cathode are connected by a wire, and the wire extends to a battery. The first anode and the first cathode constitute a fuel cell.

[0008] Optionally, micropores with a diameter not exceeding 2 μm are provided on the first separator, and conductive nanowires for transferring protons are embedded in some of the micropores.

[0009] Optionally, the rotating magnetic field device includes an electromagnetic coil array, a three-phase AC power supply module, and a magnetic field sensor. The electromagnetic coil array includes multiple electromagnetic coils, and the multiple electromagnetic coils are arranged in a ring. The three-phase AC power supply module is electrically connected to the electromagnetic coil array. The three-phase AC power supply module provides the coil with three-phase AC power with a phase difference of 120°. The electromagnetic coil array generates a controllable rotating magnetic field based on the three-phase AC power. The magnetic field sensor is arranged in the anaerobic tank to monitor the magnetic field conditions in the anaerobic tank.

[0010] Optionally, a first inlet and a first outlet are provided on one side of the sewage treatment tank. The first outlet is connected to the aerobic tank through a return pipe. A first sewage pump is provided on the return pipe. The first sewage pump is used to pump sewage from the anaerobic tank to the aerobic tank.

[0011] Optionally, a fan pump is provided on the top of the aerobic pool, a ventilation pipe is connected to the fan pump, a plurality of ventilation nozzles are provided on the ventilation pipe, and the ventilation pipe extends to the bottom of the aerobic pool.

[0012] Optionally, a plurality of filter plates are arranged in the filter pool from bottom to top.

[0013] Optionally, the collection device includes a box, a guide rail arranged in the box, a linear motor arranged on the guide rail, and an electric telescopic rod arranged on the linear motor. An iron core is provided at the end of the electric telescopic rod, and multiple coils are wound around the iron core. The iron core and the coils form an electromagnet. The electric telescopic rod drives the iron core to fall into the collection pool through a through hole located on the surface of the sewage treatment tank shell, and the electromagnet adsorbs the ferroferric oxide nanoparticles after being energized.

[0014] Optionally, the positive terminal and the negative terminal of the battery are connected to the liquid in the collection tank through wires, and a current sensor is provided on the negative terminal, the current sensor is connected to the central controller signal, and the central controller is connected to the collection device signal.

[0015] The beneficial effects of the present invention are as follows: by introducing ferroferric oxide nanoparticles with surface modifications of sulfonic acid groups into an anaerobic tank and using a rotating magnetic field device to generate a rotating magnetic field to drive them into a directional vortex flow, the ferroferric oxide nanoparticles are not only able to adsorb protons and load anaerobic microorganisms to form a magnetic biofilm, increasing microbial density and activity, but also, with the help of the directional vortex flow, enhance the mixed mass transfer efficiency of microorganisms and sewage, and accelerate the degradation process of organic matter. At the same time, an ultrasonic vibrator array is set at the bottom of the aerobic tank to break down difficult-to-degrade organic matter through the cavitation effect, promote the generation of free radicals, strengthen the oxidation reaction, and increase the dissolved oxygen concentration, further enhancing the metabolic activity of aerobic microorganisms. The synergistic effect of these multiple aspects greatly improves the overall efficiency of sewage treatment.

[0016] The first anode in the anaerobic tank and the first cathode in the aerobic tank form a fuel cell. While oxidizing and decomposing organic matter in the sewage, they can store the generated electricity in the battery through wires, providing power support for the operation of some equipment in the device, reducing dependence on the external power grid, which is in line with the energy self-sufficiency concept of the zero-carbon cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural diagram of a sewage zero-discharge treatment device provided by the present invention

[0018] Figure 2 A schematic diagram of a first separator provided by the present invention;

[0019] Description of Figure Numbers:

[0020] 1. Sewage treatment tank; 2. First partition; 3. Second partition; 4. Third partition; 5. Fourth partition; 6. Anaerobic tank; 7. Aerobic tank; 8. Filter tank; 9. Collection tank; 10. Ultrasonic vibrator array; 11. First anode; 12. First cathode; 13. Electromagnetic coil; 16. Filter plate; 17. First outlet; 18. Return pipe; 19. First sewage pump; 20. Fan pump; 21. Ventilation pipe; 22. Box; 23. Guide rail; 24. Linear motor; 25. Electric telescopic rod; 26. Iron core; 27. Multiple coils; 28. Micropores; 29. ​​Conductive nanowires. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further elaborated in detail below in conjunction with the drawings and specific embodiments of the specification. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In the following description, reference is made to "some embodiments", which describes a subset of all possible embodiments, but it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0022] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0023] It should be understood that the present invention can be implemented in different forms and should not be interpreted as being limited to the embodiments proposed herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. And the purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the terms "comprising" and / or "comprising" when used in this specification determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0024] It should also be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0025] In order to fully understand the present invention, a detailed structure will be provided in the following description to illustrate the technical solution proposed by the present invention. Optional embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other implementations.

[0026] Example 1

[0027] Please refer to the attached Figures 1 to 2 The present application provides a zero-discharge sewage treatment device, which includes a sewage treatment tank 1. The sewage treatment tank 1 is provided with a first baffle 2, a second baffle 3, a third baffle 4 and a fourth baffle 5. The enclosed area formed on one side of the first baffle 2 is an anaerobic tank 6, the enclosed area between the second baffle 3 and the third baffle 4 forms an aerobic tank 7, the enclosed area between the second baffle 3 and the third baffle 4 forms a filtration tank 8, and the enclosed area between the third baffle 4 and the fourth baffle 5 forms a collection tank 9. A rotating magnetic field device is provided on the periphery of the anaerobic tank 6, and the rotating magnetic field device generates a rotating magnetic field. There are ferroferric oxide nanoparticles with surface modified sulfonic acid groups in the anaerobic tank 6. The ferroferric oxide nanoparticles have superparamagnetism and are driven by the rotating magnetic field to form a directional vortex flow. The ferroferric oxide nanoparticles adsorb protons and load anaerobic microorganisms to form a magnetic biofilm. At the same time, the directional vortex flow enhances the mixing and mass transfer efficiency of microorganisms and sewage. An ultrasonic vibrator array 10 is provided at the bottom of the aerobic tank 7, and a collection device is provided above the sewage treatment tank 1.

[0028] Specifically, the present application provides a zero-discharge sewage treatment device, which is used in a zero-carbon cabin to treat the domestic sewage generated during daily living in the zero-carbon cabin and generate reusable return water. Its energy comes from the clean energy in the zero-carbon cabin, such as solar energy or wind energy. It divides the interior of the sewage treatment tank 1 into an anaerobic tank 6, an aerobic tank 7, a filter tank 8, and a collection tank 9 through a first partition 2, a second partition 3, a third partition 4, and a fourth partition 5. The external sewage first enters the anaerobic tank 6, stays in the anaerobic tank 6 for a period of time, and then is transported to the aerobic tank 7. During the stay, ferroferric oxide nanoparticles with surface modified sulfonic acid groups are added to the anaerobic tank 6, and the surface of the particles can load or adsorb anaerobic microorganisms. , such as methanogens, form magnetic biofilms, increase microbial density and activity, and at the same time, the rotating magnetic field device generates an alternating rotating magnetic field with a frequency of 5-50Hz and an intensity of 0.1-0.5T. In addition, the alternating magnetic field stimulates the permeability of microbial cell membranes through magnetic-induced biological effects, promotes enzyme activity and ATP synthesis, thereby improving the degradation efficiency of anaerobic microorganisms on organic matter in sewage. At the same time, the superparamagnetism of ferroferric oxide nanoparticles causes the particles to form a directional vortex flow under the drive of the rotating magnetic field. The center of the directional vortex flow forms a low-pressure area due to centrifugal force, which enhances the mixing and mass transfer efficiency of microorganisms and sewage. Through the action of the vortex flow, the organic matter in the sewage can be more effectively mixed and contacted with the anaerobic microorganisms, thereby accelerating the degradation process of organic matter;

[0029] After the domestic sewage is treated in the anaerobic tank 6 and flows into the aerobic tank 7, the ultrasonic vibrator array 10 arranged at the bottom of the aerobic tank 7 emits 20-100kHz high-frequency sound waves, which break down the refractory organic matter through the cavitation effect, promote the generation of free radicals, and strengthen the oxidation reaction. The ultrasonic waves also increase the dissolved oxygen concentration and promote the metabolic activity of aerobic microorganisms, such as nitrifying bacteria.

[0030] The sewage treated in the anaerobic tank 6 and the aerobic tank 7 enters the filter tank 8, where flocculent sediments or colloids are formed and harmful substances are removed. The clean water treated in the filter tank 8 flows into the collection tank 9, and the ferroferric oxide particles in the sewage are adsorbed by the collection device arranged above the sewage treatment tank 1. The recovered particles are regenerated by acid washing and then put back into the anaerobic tank 6, forming a closed and stable cycle.

[0031] In an optional embodiment, a first anode 11 is provided in the anaerobic tank 6, and a first cathode 12 is provided in the aerobic tank 7. One end of the first anode 11 and the first cathode 12 are connected by a wire, and the wire extends to the battery.

[0032] Specifically, the first anode 11 in the anaerobic tank 6 adopts a porous carbon brush electrode, and its three-dimensional network structure provides an attachment carrier with a high specific surface area for anaerobic microorganisms. The nitrogen-doped carbon layer modified on the electrode surface can reduce the electron transfer impedance and promote the efficient transfer of electrons generated by microbial metabolism. The first cathode 12 in the aerobic tank 7 is a titanium-based platinum-carbon catalytic electrode. The nano-platinum particles loaded on its surface form a porous structure through chemical vapor deposition, which significantly improves the catalytic activity of the oxygen reduction reaction. The first anode 11 and the first cathode 12 are connected by a flexible graphene composite wire. The outer layer of the wire is coated with a corrosion-resistant polytetrafluoroethylene insulation layer, and the copper core is embedded in it to enhance conductivity. The end of the wire is connected to a lithium iron phosphate battery pack to realize energy storage. In the anaerobic environment of the anaerobic tank 6, organic matter decomposes and releases electrons and protons under the action of microorganisms. The electrons are directly transferred to the wire through the surface of the first anode 11, and in the directional vortex flow Under the action of the low-pressure area formed by the centrifugal force, the protons are adsorbed by the sulfonic acid group-modified ferroferric oxide nanoparticles and move to the surface of the first partition 2 with the vortex flow. Since the first partition 2 is provided with micropores 28 with a diameter not exceeding 2 μm, the protons adsorbed by the sulfonic acid group-modified ferroferric oxide nanoparticles can flow into the aerobic tank 7 through some micropores 28, and then be transferred to the first cathode 12 to form current. The obtained current is output to the lithium iron phosphate battery pack through the wire for storage. In the above manner, through the above arrangement, electrical energy is obtained while oxidizing and decomposing pollutants based on the principle of fuel cells.

[0033] Furthermore, the diameter of the micropores 28 on the first separator 2 in this application is 1-2 μm, much smaller than the particle size of suspended solids in sewage (typically >10 μm). According to the Hagen-Poiseuille law, the flow rate of fluid through the micropores 28 is proportional to the fourth power of the pore diameter. At this size, the sewage flow resistance is extremely high, and the measured flow rate is only 0.05 mm / s, which is insufficient to cause substantial leakage. The design of the micropores 28 is precisely calculated and material optimized to ensure efficient proton transfer while effectively preventing sewage from flowing from the anaerobic tank 6 into the aerobic tank 7.

[0034] In an optional embodiment, the rotating magnetic field device includes an electromagnetic coil 13 array, a three-phase AC power supply module, and a magnetic field sensor. The number of electromagnetic coils 13 in the electromagnetic coil 13 array is multiple, and the multiple electromagnetic coils 13 are arranged in a ring. The three-phase AC power supply module is electrically connected to the electromagnetic coil 13 array. The three-phase AC power supply module provides the coil with three-phase AC power with a phase difference of 120°. The electromagnetic coil 13 array generates a controllable rotating magnetic field based on the three-phase AC power. The magnetic field sensor is arranged in the anaerobic tank 6 for monitoring the magnetic field conditions in the anaerobic tank 6.

[0035] Specifically, the electromagnetic coil array 13 is composed of multiple electromagnetic coils 13, which are arranged in a ring shape and evenly distributed around the periphery of the anaerobic tank 6, that is, some electromagnetic coils 13 are set around the periphery of the sewage treatment tank 1, and some electromagnetic coils 13 are embedded in the first partition 2. The three-phase AC power supply module is electrically connected to the electromagnetic coil array 13, providing the coils with three-phase AC power with a phase difference of 120°. When the three-phase AC power is input into the electromagnetic coil array 13, based on the principle of electromagnetic induction, vector synthesis is generated inside the anaerobic tank 6 under the action of the three-phase current to generate an alternating rotating magnetic field with a frequency of 5-50 Hz and an intensity of 0.1-0.5 T. The direction of rotation is switched forward and reverse by adjusting the phase sequence. The magnetic field sensor monitors the magnetic field conditions in the anaerobic tank 6 in real time to ensure that the magnetic field strength and direction meet the preset requirements, so as to achieve effective driving of the ferroferric oxide nanoparticles. These nanoparticles form a directional vortex flow under the action of the rotating magnetic field, and the sulfonic acid groups on their surface adsorb protons, while loading anaerobic microorganisms to form a magnetic biofilm. The vortex flow enhances the mixing and mass transfer between microorganisms and sewage, and improves the efficiency of organic matter degradation.

[0036] In an optional embodiment, after the sewage enters the filter tank 8, a flocculant is added to the filter tank 8. The flocculant can promote the aggregation of fine particles in the sewage to form larger flocs, which are easier to be retained by the filter plate 16. There are multiple filter plates 16 arranged from bottom to top in the filter tank 8. The precipitate or colloid formed will be intercepted by the multiple filter plates 16 and will always be below the filter tank 8. The treated clean water is transported to the collection tank 9.

[0037] In an optional embodiment, the collecting device includes a box body 22, a guide rail 23 arranged in the box body 22, a linear motor 24 arranged on the guide rail 23, and an electric telescopic rod 25 arranged on the linear motor 24. An iron core 26 is provided at the end of the electric telescopic rod 25, and multiple coils are wound around the iron core 26. The iron core 26 and the coils form an electromagnet. The electric telescopic rod 25 drives the iron core 26 to fall into the collection pool 9 from the through hole located on the surface of the outer shell of the sewage treatment tank 1, and the ferroferric oxide nanoparticles are adsorbed after the electromagnet is energized.

[0038] Specifically, its linear motor 24 is a permanent magnet synchronous type with a rated thrust of 200N. When the device is started, the linear motor 24 drives the electric telescopic rod 25 to move along the guide rail 23. After reaching the preset position, the electric telescopic rod 25 moves downward, and the iron core 26 on it passes through the Φ55mm ceramic sealed through hole prefabricated on the side wall of the sewage treatment tank 1 and enters the liquid surface of the collection tank 9. The multiple coils on the iron core 26 are energized to form an electromagnet to generate a magnetic field. Under the action of the Lorentz force, the ferroferric oxide nanoparticles are adsorbed to the surface of the iron core 26. After the adsorption is completed, the electric telescopic rod 25 rises, driving the ferroferric oxide nanoparticles to leave the water, and then the linear motor 24 drives the electric telescopic rod 25 to move along the guide rail 23, so that the electromagnet moves to the collection box inside the box 22. After the power supply of the coil is stopped, the ferroferric oxide nanoparticles fall into the collection box inside the box 22. The ferroferric oxide nanoparticles in the collection box can be reused after the user takes them out for pickling.

[0039] In an optional embodiment, a first inlet and a first outlet 17 are provided on one side of the sewage treatment tank 1. The first outlet 17 is connected to the aerobic tank 7 through a return pipe 18. A first sewage pump 19 is provided on the return pipe 18. The first sewage pump 19 is used to pump sewage in the anaerobic tank 6 to the aerobic tank 7.

[0040] Furthermore, a fan pump 20 is provided on the top of the aerobic pool 7 , a ventilation pipe 21 is connected to the fan pump 20 , a plurality of ventilation nozzles are provided on the ventilation pipe 21 , and the ventilation pipe 21 extends to the bottom of the aerobic pool 7 .

[0041] Specifically, a first outlet 17 is provided on one side of the sewage treatment tank 1. This outlet 17 is connected to the aerobic tank 7 via a return pipe 18. This return pipe 18 is equipped with a first sewage pump 19, which pumps sewage from the anaerobic tank 6 into the aerobic tank 7, thereby circulating the sewage between the different treatment areas. A fan pump 20 is installed at the top of the aerobic tank 7, connected to a ventilation pipe 21. Ventilation pipe 21 is equipped with several ventilation nozzles and extends to the bottom of the aerobic tank 7, providing sufficient oxygen for the aerobic microorganisms to maintain their activity and treatment efficiency.

[0042] In an optional embodiment, the positive terminal and the negative terminal of the battery are connected to the liquid in the collection tank 9 through wires, and a current sensor is provided on the negative terminal, the current sensor is connected to the central controller signal, and the central controller is connected to the collection device signal.

[0043] Specifically, the current sensor is used to monitor the current flowing through the negative terminal in real time. The current sensor transmits the monitored current signal to the central controller. The positive and negative terminals of the battery are both connected to the liquid in the collection tank 9 via wires. Because the ferroferric oxide nanoparticles enhance the conductivity of the liquid in the collection tank 9, the positive and negative terminals of the battery and the liquid in the collection tank 9 form a closed circuit. Therefore, when the current value detected by the current sensor exceeds a threshold value, it indicates that the ferroferric oxide nanoparticles in the liquid in the collection tank 9 need to continue to be adsorbed.

[0044] In addition, the battery can also supply power to other electrical equipment in the zero-carbon cabin.

[0045] Example 2

[0046] The difference between Example 2 and Example 1 is that, in order to enhance the transfer efficiency, conductive nanowires 29 for transferring protons are embedded in some of the micropores 28. The protons adsorbed by the ferrosoferric oxide nanoparticles in the anaerobic tank dissociate into the conductive nanowires 29 through the sulfonic acid groups and migrate to the aerobic tank by a jumping mechanism driven by the potential difference, which is 12 times higher than the traditional diffusion method.

[0047] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. The scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A sewage zero-discharge treatment device, characterized in that: The device includes a sewage treatment tank, which is provided with a first baffle, a second baffle, a third baffle, and a fourth baffle. The enclosed area formed on one side of the first baffle is an anaerobic tank, the enclosed area between the second baffle and the third baffle forms an aerobic tank, the enclosed area between the second baffle and the third baffle forms a filtration tank, and the enclosed area between the third baffle and the fourth baffle forms a collection tank. A rotating magnetic field device is provided on the periphery of the anaerobic tank, and the rotating magnetic field device generates a rotating magnetic field. Surface-modified sulfonic acid group-containing ferroferric oxide nanoparticles exist in the anaerobic tank. The ferroferric oxide nanoparticles have superparamagnetism and are driven by the rotating magnetic field to form a directional vortex flow. The ferroferric oxide nanoparticles adsorb protons and load anaerobic microorganisms to form a magnetic biofilm. At the same time, the directional vortex flow enhances the mixing and mass transfer efficiency of microorganisms and sewage. An ultrasonic vibrator array is provided at the bottom of the aerobic tank, and a collection device is provided above the sewage treatment tank.

2. A sewage zero-discharge treatment device according to claim 1, characterized in that: The anaerobic tank is provided with a first anode, the aerobic tank is provided with a first cathode, one end of the first anode and the first cathode are connected by a wire, and the wire extends to the battery. The first anode and the first cathode constitute a fuel cell.

3. A sewage zero-discharge treatment device according to claim 2, characterized in that: The first separator is provided with micropores with a diameter not exceeding 2 μm, and conductive nanowires for transferring protons are embedded in some of the micropores.

4. A sewage zero-discharge treatment device according to claim 1 or 3, characterized in that: The rotating magnetic field device includes an electromagnetic coil array, a three-phase AC power supply module, and a magnetic field sensor. The electromagnetic coil array includes multiple electromagnetic coils, and the multiple electromagnetic coils are arranged in a ring. The three-phase AC power supply module is electrically connected to the electromagnetic coil array. The three-phase AC power supply module provides the coil with three-phase AC power with a phase difference of 120°. The electromagnetic coil array generates a controllable rotating magnetic field based on the three-phase AC power. The magnetic field sensor is arranged in the anaerobic tank to monitor the magnetic field conditions in the anaerobic tank.

5. The sewage zero-discharge treatment device according to claim 1, characterized in that: A first inlet and a first outlet are provided on one side of the sewage treatment tank. The first outlet is connected to the aerobic tank through a return pipe. A first sewage pump is provided on the return pipe. The first sewage pump is used to pump sewage from the anaerobic tank to the aerobic tank.

6. A sewage zero-discharge treatment device according to claim 5, characterized in that: A fan pump is provided on the top of the aerobic pool, a ventilation pipe is connected to the fan pump, a plurality of ventilation nozzles are provided on the ventilation pipe, and the ventilation pipe extends to the bottom of the aerobic pool.

7. The sewage zero-discharge treatment device according to claim 5, characterized in that: A plurality of filter plates are arranged in the filter pool from bottom to top.

8. The sewage zero-discharge treatment device according to claim 1, characterized in that: The collection device includes a box, a guide rail arranged in the box, a linear motor arranged on the guide rail, and an electric telescopic rod arranged on the linear motor. An iron core is provided at the end of the electric telescopic rod, and multiple coils are wound around the iron core. The iron core and the coils form an electromagnet. The electric telescopic rod drives the iron core to fall into the collection pool through a through hole located on the surface of the sewage treatment tank shell. When the electromagnet is energized, the iron oxide nanoparticles are adsorbed.

9. The sewage zero-discharge treatment device according to claim 1, characterized in that: The positive terminal and the negative terminal of the battery are both connected to the liquid in the collection tank through wires, and a current sensor is provided on the negative terminal. The current sensor is connected to the central controller signal, and the central controller is connected to the collection device signal.

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