A sewage treatment device integrating acidification treatment and microbial fuel cell

Abstract

The present invention relates to a manure treatment device that integrates acidification treatment and a microbial fuel cell. The device comprises a support frame, an acidification reservoir mounted on the support frame, and a microbial fuel cell power generation device. The acidification reservoir comprises a first acidification tank, an intermediate channel, and a second acidification tank. The microbial fuel cell power generation device is located between the first and second acidification tanks. One end of the intermediate channel communicates with the first acidification tank, and the other end passes through the microbial fuel cell power generation device and communicates with the second acidification tank. The top of the first acidification tank defines a manure feed inlet, and the bottom of the second acidification tank defines a precipitate outlet. The intermediate channel is provided with an acidification liquid outlet, which communicates with the reaction chamber within the microbial fuel cell power generation device through the acidification liquid outlet. The present invention not only treats manure but also provides energy supplementation for farm infrastructure, saving energy consumption.

Description

Technical Field

[0001] The invention relates to a manure treatment device integrating acidification treatment and microbial fuel cell, belonging to the technical field of power generation devices. Background Art

[0002] Existing liquid manure from livestock and poultry farming is mostly treated anaerobically using biogas projects. This process not only renders the manure harmless but also produces biogas, which, after dehydration and desulfurization, can be used for power generation, lighting, and cooking. Currently, anaerobic fermentation technology for biogas is mature and has been widely adopted worldwide, including in China. However, biogas projects have stringent technical requirements and high operating costs. The storage space required for biogas slurry is large, and its low nutrient content and unsuitability for long-distance transportation make it difficult to digest the slurry, creating bottlenecks that hinder the sustainable operation of biogas projects. Scientifically addressing the problem of liquid manure from livestock and poultry farming is a major challenge for the sustainable development of China's livestock and poultry farming industry.

[0003] Microbial fuel cells (MFCs) are a novel bioprocess tool that uses electrogenic microorganisms as biocatalysts to convert chemical energy in organic wastewater into electricity, simultaneously treating the wastewater while generating electricity. The energy generated by MFCs in organic wastewater treatment not only maintains the normal operation of the entire system but also enables energy recovery and storage, alleviating my country's current energy shortage.

[0004] Livestock and poultry manure contains energy and exists in the form of biodegradable organic matter. However, after microbial acidification, the manure produces a large amount of sediment, which can clog the channels between the microbial fuel cell boxes and cause system instability. Existing microbial fuel cells are also expensive to produce and have low recycling rates, making them difficult to promote and apply on a large scale. Given the current difficulties in treating liquid livestock and poultry manure in my country, a microbial fuel cell device was developed that both recovers the energy from the manure and ensures that the treated liquid manure meets the standards for return to farmland or discharge. Summary of the Invention

[0005] The purpose of the present invention is to provide a manure treatment device integrating acidification treatment and microbial fuel cell to solve or improve the problems existing in the recovery of livestock and poultry manure.

[0006] The technical solution provided by the present invention is as follows: a manure and sewage treatment device integrating acidification treatment and microbial fuel cell, comprising a support frame, an acidification storage and a microbial fuel cell power generation device mounted on the support frame, the acidification storage comprising a first acidification tank, an intermediate channel and a second acidification tank, the microbial fuel cell power generation device being located between the first and second acidification tanks, one end of the intermediate channel being connected to the first acidification tank, and the other end passing through the microbial fuel cell power generation device and connected to the second acidification tank, a manure and sewage feed inlet being provided at the top of the first acidification tank, a sediment outlet being provided at the bottom of the second acidification tank, an acidification liquid outlet being provided on the intermediate channel, and the intermediate channel being connected to a reaction chamber in the microbial fuel cell power generation device via the acidification liquid outlet.

[0007] Furthermore, the microbial fuel cell power generation device includes a battery box, which is provided with a through cavity for the intermediate channel to pass through and a plurality of reaction chambers separated by partitions. The plurality of reaction chambers are distributed around the circumference of the through cavity, and a through hole is provided on the partition between two adjacent reaction chambers. A reaction liquid outlet is also opened outside the battery box.

[0008] The beneficial effect of adopting the above further scheme is that the through hole is used to enter the acidifying liquid so that the acidifying liquid is evenly distributed in each reaction chamber, and the reaction liquid outlet is used to discharge the reaction liquid in the reaction chamber. Livestock and poultry manure is used as a substrate for power generation. After anaerobic acidification, livestock and poultry manure will produce a large amount of fatty acids, which are the reactants of the anode reaction.

[0009] Furthermore, an acidizing liquid inlet is provided on the inner side wall of the battery box, and the battery box can move up and down along the middle channel, and the acidizing liquid inlet and the acidizing liquid outlet are opened and closed by the up and down movement of the battery box.

[0010] The beneficial effect of adopting the above further solution is that when the battery box is moved to a position where the acidizing liquid inlet and the acidizing liquid outlet are aligned, the acidizing liquid inlet and the acidizing liquid outlet are both opened; when the battery box is moved to a position where the acidizing liquid inlet and the acidizing liquid outlet are staggered, the acidizing liquid inlet and the acidizing liquid outlet are both closed.

[0011] Furthermore, the microbial fuel cell power generation device is suspended below the first acidification tank via a plurality of springs.

[0012] The beneficial effect of adopting the above further solution is that the battery box can be moved up and down by the elastic force of the spring.

[0013] Furthermore, a slide rail is provided on the middle channel, and a slider is provided on the side wall of the through cavity, and the slider is installed in cooperation with the slide rail.

[0014] The beneficial effect of adopting the above further solution is that the cooperation between the slider and the slide rail can enable the battery box to move up and down along the middle channel, thereby preventing the battery box from being misplaced during the up and down movement.

[0015] Furthermore, each reaction chamber is provided with an anode and a cathode.

[0016] Furthermore, an electrode hole is provided on the top of each reaction chamber, and an air cathode ventilation hole is provided on the outer side of each reaction chamber.

[0017] The beneficial effect of adopting the above further solution is that the electrode holes can not only be connected to external wires, but can also be used as exhaust holes, and the air cathode ventilation holes are used for cathode reactions.

[0018] Furthermore, an exhaust hole is provided on the top of the first acidification tank.

[0019] The beneficial effect of adopting the above further solution is that the exhaust hole is connected to the air bag for observing the gas production of the acidification storage device.

[0020] Furthermore, an acidity sensor is provided inside the acidification storage tank, and a temperature sensor is also provided inside the microbial fuel cell power generation device.

[0021] Furthermore, the bottom of the first acidification box is made of transparent material, and an ultraviolet lamp is installed at the bottom of the first acidification box.

[0022] The beneficial effect of adopting the above further solution is that the ultraviolet lamp is used to treat the acidified liquid in the first acidification box, and the ultraviolet lamp can inactivate bacteria such as methanogens that compete with electrogenic bacteria, and only retain highly active electrogenic bacteria.

[0023] Furthermore, the battery box is made of a non-transparent material, or a light shield is provided above the battery box.

[0024] The beneficial effect of adopting the above further solution is to prevent the ultraviolet lamp from irradiating the electrogenic bacteria in the reaction chamber and accidentally killing the electrogenic bacteria.

[0025] Furthermore, a voltage monitoring system is provided on the microbial fuel cell power generation device.

[0026] The beneficial effect of adopting the above further solution is that it can be used to detect the voltage of the microbial fuel cell power generation device at any time.

[0027] Furthermore, an energy management system is provided on the microbial fuel cell power generation device, and an energy collection device is provided in the energy management system.

[0028] The beneficial effect of adopting the above further solution is that the functions of the energy collection device include boosting and power supply, and after the output voltage is increased, it can directly provide energy for small-scale lighting.

[0029] Furthermore, it also includes a PLC control system, and the temperature sensor and acidity sensor are electrically connected to the PLC control system. The PLC control system is provided with a control panel, and the control panel is provided with a display screen for displaying temperature and acidity, thereby realizing the real-time temperature and acidity detection function of the manure treatment device during the power generation process.

[0030] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0031] 1. The microbial fuel cell power generation device of the present invention is located between a first acidification tank and a second acidification tank. The reaction chamber in the microbial fuel cell power generation device is connected to an intermediate channel. Acidified liquid produced by microbial acidification of livestock and poultry manure enters the reaction chamber through the intermediate channel. The resulting precipitate settles into the second acidification tank and can be discharged from the bottom of the second acidification tank. Therefore, the precipitate does not block the channel between the microbial fuel cell tanks, ensuring smooth operation of the system.

[0032] 2. The manure and sewage treatment device of the present invention realizes miniaturized and integrated manure and sewage treatment, which not only achieves efficient manure and sewage treatment, but also utilizes the electricity-generating characteristics of electrogenic microorganisms to achieve energy recovery and utilization, thus controlling costs and reducing energy losses caused by scale expansion, while achieving efficient electricity generation and treatment.

[0033] 3. The manure treatment device integrating acidification treatment and microbial fuel cell of the present invention is suitable for popularization and application. It not only realizes the treatment of manure and reduces pollution, but also provides energy supplement for the infrastructure in the farm and saves energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the integrated manure and sewage treatment device of the present invention;

[0035] Figure 2 It is a schematic diagram of the three-dimensional structure of the acidification storage device of the present invention;

[0036] Figure 3 Schematic diagram of the installation structure of the ultraviolet lamp of the present invention;

[0037] Figure 4 It is a schematic diagram of the three-dimensional structure of the microbial fuel cell power generation device of the present invention;

[0038] Figure 5 This is a schematic diagram of the internal structure of the microbial fuel cell power generation device of the present invention;

[0039] Figure 6 Schematic diagram of the internal structure of the battery box of the present invention;

[0040] Figure 7 Schematic diagram of power generation principle of a reaction chamber of the present invention;

[0041] In the figure, 1. Acidification storage tank; 101. First acidification box; 102. Middle channel; 103. Second acidification box; 2. Microbial fuel cell power generation device; 201. Battery box; 3. Exhaust hole; 4. Manure feed port; 5. Reaction liquid outlet; 6. Electrode hole; 7. Roller-pressed air cathode; 801. Voltage monitoring system; 802. Energy management system; 9. Spring; 10. Support frame; 11. Precipitation material outlet; 12. Slider; 13. Through cavity; 14. Acidification liquid outlet; 15. Slide rail; 16. Acidity sensor; 17. Through hole; 18. Air cathode ventilation hole; 19. Reaction chamber; 20. Carbon fiber brush anode; 21. Partition; 22. Acidification liquid inlet; 23. Ultraviolet lamp. DETAILED DESCRIPTION

[0042] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0043] like Figures 1 to 6As shown, a manure treatment device integrating acidification treatment and microbial fuel cell comprises a support frame 10, an acidification storage 1 and a microbial fuel cell power generation device 2 mounted on the support frame 10, wherein the acidification storage 1 is used to store livestock and poultry manure, and the microbial fuel cell power generation device 2 is an air cathode multi-anode chamber microbial fuel cell power generation device 2, wherein the acidification storage 1 comprises a first acidification box 101, an intermediate channel 102 and a second acidification box 103, wherein the first acidification box 101, the intermediate channel 102 and the second acidification box 103 are in the shape of an "I", and the microbial fuel cell power generation device 2 is located between the first acidification tank 101 and the second acidification tank 103. One end of the intermediate channel 102 is connected to the first acidification tank 101, and the other end passes through the microbial fuel cell power generation device 2 and is connected to the second acidification tank 103. The top of the first acidification tank 101 is provided with a manure feed port 4, which is connected to the manure pipe. The bottom of the second acidification tank 103 is provided with a sediment outlet 11. The sediment produced after the acidification reaction in the acidification storage 1 is discharged from the sediment outlet 11. The sediment outlet 11 is provided with a discharge valve. When discharging, the discharge valve is opened to discharge the sediment. The intermediate channel 102 is provided with an acidification liquid outlet 14, and the inner wall of the battery box 201 is provided with an acidification liquid inlet 22. The battery box 201 can move up and down along the intermediate channel 102, and the acidification liquid inlet 22 and the acidification liquid outlet 14 are opened and closed by the up and down movement of the battery box 201. When the battery box 201 moves to a position where the acidizing liquid inlet 22 and the acidizing liquid outlet 14 overlap, the acidizing liquid inlet 22 and the acidizing liquid outlet 14 are opened; when the battery box 201 moves to a position where the acidizing liquid inlet 22 and the acidizing liquid outlet 14 are staggered, the acidizing liquid inlet 22 and the acidizing liquid outlet 14 are closed.

[0044] The microbial fuel cell power generation device 2 includes a battery box 201, which is in the shape of a "U". The middle of the battery box 201 is provided with a through cavity 13 for the intermediate channel 102 to pass through and a plurality of reaction chambers 19 separated by a partition 21. The plurality of reaction chambers 19 are distributed around the circumference of the through cavity 13. A through hole 17 is provided on the partition 21 between two adjacent reaction chambers 19. A reaction liquid outlet 5 is also provided on the outside of the battery box 201. In this embodiment, the reaction chambers 19 include eight. Of course, the reaction chambers 19 can be more or less, and the number of reaction chambers 19 is set according to the requirements of feces treatment.

[0045] The microbial fuel cell power generation device 2 is suspended below the first acidification tank 101 via a plurality of springs 9 . Before feeding, the weight of the microbial fuel cell power generation device 2 is balanced with the tension of the spring 9. At this time, the acidification liquid feed port and the acidification liquid discharge port are aligned, and the acidification liquid feed port and the acidification liquid discharge port are in an open state. During feeding, the acidification liquid enters the reaction chamber 19 from the middle channel 102, the weight of the reaction chamber 19 increases, the spring 9 is pulled, and the microbial fuel cell power generation device 2 is lowered as a whole. After the reaction chamber 19 is fully loaded, the acidification liquid feed port and the acidification liquid discharge port are completely offset, and feeding stops. During feeding, the reaction liquid is discharged through the reaction liquid outlet 5, the weight in the reaction chamber 19 decreases, the spring 9 retracts, the microbial fuel cell power generation device 2 is raised as a whole, the acidification liquid feed port and the acidification liquid discharge port are aligned, the acidification liquid enters the reaction chamber 19, the spring 9 is stretched, the microbial fuel cell power generation device 2 is lowered as a whole, and after the reaction chamber 19 is fully loaded, the acidification liquid feed port and the acidification liquid discharge port are completely offset, feeding stops, and feeding is completed and acidification continues. The battery box 201 and the middle channel 102 are tightly fitted together to prevent the acidified liquid from flowing out of the gap between the middle channel 102 and the battery box 201 .

[0046] A slide rail 15 is provided on the intermediate channel 102 , and a slider 12 is provided on the side wall of the through cavity 13 . The slider 12 is installed in coordination with the slide rail 15 .

[0047] Each reaction chamber 19 of the microbial fuel cell power generation device 2 is provided with an anode and a cathode. Due to the participation of microorganisms and chemical substances, the reaction at the anode of the microbial fuel cell will be more complicated. Therefore, the anode material must also have good biocompatibility, excellent electrical conductivity, corrosion resistance, high specific surface area and high porosity. In this embodiment, the anode adopts a carbon fiber brush anode 20, and the carbon fiber brush anode 20 can be made of T700-12K carbon fiber and pure titanium wire (diameter 1mm) made by Toray Industries, Japan in the same style as a spiral test tube brush. The bristle part is 6cm long, the bristle diameter is 6cm long, and the brush handle is 24cm long. The specific surface area is about 18000m 2 / m 3 . The carbon brush needs to be rinsed with deionized water before use, soaked in acetone solution overnight for activation, then rinsed with deionized water and dried, placed in a 370-degree Celsius muffle furnace for two hours, taken out, and assembled after cooling. The cathode adopts a roller-pressed air cathode 7, using conductive carbon black and 60-mesh stainless steel mesh as the substrate, and conductive activated carbon powder as the catalyst. No precious metal catalyst is used in the whole process, which greatly reduces the production cost. The preparation method of the cathode using a roller-pressed air cathode 7 can refer to the doctoral dissertation entitled "Research on the Operation and Community Characteristics of Flat Anode Microbial Fuel Cells" published by Jiang Qingqing of Harbin Institute of Technology in 2019, pages 38-42 on the part of electrode preparation.

[0048] Each reaction chamber 19 has an electrode hole 6 formed above it, and an air cathode vent 18 formed on the outer side of each reaction chamber 19. The electrode hole 6 can be connected to an external wire and can also be used as an exhaust hole 3. The air cathode vent 18 is used for the reaction of the roller-pressed air cathode 7.

[0049] The top of the first acidification tank 101 is provided with an exhaust hole 3. The exhaust hole 3 is connected to an air bag for observing the gas production of the acidification storage 1.

[0050] An acidity sensor 16 is provided inside the acidification storage 1 , and a temperature sensor is also provided inside the microbial fuel cell power generation device 2 .

[0051] The bottom of the first acidification tank 101 is made of a transparent material and is equipped with an ultraviolet lamp 23. The ultraviolet lamp 23 is used to treat the acidified liquid within the first acidification tank 101. It sterilizes bacteria, such as methanogens, that compete with electrogenic bacteria, leaving only active electrogenic bacteria. The battery box 201 is made of a non-transparent material, or a light shield is provided above the battery box 201 to prevent the ultraviolet lamp 23 from irradiating the electrogenic bacteria within the reaction chamber 19 and accidentally killing those that are currently generating electricity.

[0052] An ultraviolet lamp 23 is installed at the bottom of the first acidification tank 101 to treat the acidified liquid. Under the irradiation of ultraviolet light, bacteria such as methanogens that compete with electrogenic bacteria are inactivated, leaving only the highly active electrogenic bacteria, thus maintaining stable battery performance.

[0053] The microbial fuel cell power generation device 2 is provided with a voltage monitoring system 801 for detecting the voltage of the microbial fuel cell power generation device 2 at any time.

[0054] An energy management system 802 is provided on the microbial fuel cell power generation device 2. An energy collection device is provided in the energy management system 802. The energy collection device can be directly connected to a capacitor. The functions of the energy collection device include boosting and power supply. After the output voltage is increased, it can directly provide energy for small-scale lighting.

[0055] The manure treatment device also includes a PLC control system. The temperature sensor and acidity sensor 16 are both electrically connected to the PLC control system. The PLC control system is provided with a control panel, and the control panel is provided with a display screen for displaying temperature and acidity, thereby realizing the real-time temperature and acidity detection function of the manure treatment device during power generation.

[0056] The power generation principle of a reaction chamber 19 of the microbial fuel cell power generation device 2 of the present invention is referenced Figure 7 .

[0057] The method of using the manure treatment device of the present invention is as follows:

[0058] In the initial state of the microbial fuel cell, the acidification liquid inlet 22 is aligned with the acidification liquid outlet 14, and the acidification liquid inlet 22 and the acidification liquid outlet 14 are in an open state. When manure is added from the manure feed inlet 4 into the first acidification tank 101 and the second acidification tank 103 of the acidification storage 1, the fecal water and inoculum in the manure enter the reaction chamber 19 through the acidification liquid inlet 22 and the acidification liquid outlet 14. As the acidification liquid flows in, the microbial fuel cell power generation device 2 slowly slides downward due to the increase in gravity, and the acidification liquid outlet 14 and the acidification liquid inlet 22 gradually shift. When the microbial fuel cell power generation device 2 is fully filled with acidification liquid, the acidification liquid outlet 14 and the acidification liquid inlet 22 are completely shifted, and the acidification liquid inlet 22 and the acidification liquid outlet 14 are closed, and feeding stops. The acidification stage is carried out simultaneously with the microbial fuel cell startup stage. When the acidification storage 1 begins to produce gas, the ultraviolet lamp 23 is turned on and turned on for a certain period of time before being turned off. After a certain period of reaction, the reaction liquid outlet 5 is opened to discharge the reaction liquid in the reaction chamber 19. Under the action of the elastic restoring force of the spring 9, the microbial fuel cell power generation device 2 discharges the reaction liquid and slides upward. The acidification liquid inlet 22 is connected to the acidification liquid outlet 14 and opened. Acidification liquid is then replenished into the microbial fuel cell power generation device 2. After the reaction chamber 19 is fully loaded, it slides downward, the acidification liquid inlet 22 and the acidification liquid outlet 14 are closed, and power generation continues after the material is replenished.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sewage treatment device integrating acidification treatment and microbial fuel cell, comprising a support frame (10), characterized in that: The invention also includes an acidification storage device (1) and a microbial fuel cell power generation device (2) mounted on the support frame (10), wherein the acidification storage device (1) includes a first acidification box (101), an intermediate channel (102) and a second acidification box (103), wherein the microbial fuel cell power generation device (2) is located between the first acidification box (101) and the second acidification box (103), wherein one end of the intermediate channel (102) is connected to the first acidification box (101), and the other end passes through the microbial fuel cell power generation device (2) and is connected to the second acidification box (103), wherein a manure feed port (4) is provided at the top of the first acidification box (101), and a sediment outlet (11) is provided at the bottom of the second acidification box (103), wherein an acidification liquid outlet (14) is provided on the intermediate channel (102), and wherein the intermediate channel (102) is connected to the reaction chamber (19) in the microbial fuel cell power generation device (2) through the acidification liquid outlet (14); The microbial fuel cell power generation device (2) comprises a battery box (201), wherein the battery box (201) is provided with a through cavity (13) for the intermediate channel (102) to pass through and a plurality of reaction chambers (19) separated by partitions (21).

2. The sewage treatment device integrating acidification treatment and microbial fuel cell according to claim 1, characterized in that: The plurality of reaction chambers (19) are distributed around the circumference of the through cavity (13), a through hole (17) is provided on the partition (21) between two adjacent reaction chambers (19), and a reaction liquid outlet (5) is also provided outside the battery box (201).

3. The sewage treatment device integrating acidification treatment and microbial fuel cell according to claim 2, characterized in that: An acidizing liquid inlet (22) is provided on the inner side wall of the battery box (201), and the battery box (201) is capable of moving up and down along the middle channel (102). The opening and closing of the acidizing liquid inlet (22) and the acidizing liquid outlet (14) are achieved by the up and down movement of the battery box (201).

4. The sewage treatment device integrating acidification treatment and microbial fuel cell according to claim 1, characterized in that: The microbial fuel cell power generation device (2) is suspended below the first acidification tank (101) via a spring (9).

5. The sewage treatment device integrating acidification treatment and microbial fuel cell according to claim 2, characterized in that: A slide rail (15) is provided on the intermediate channel (102), a slider (12) is provided on the side wall of the through cavity (13), and the slider (12) is mounted in cooperation with the slide rail (15).

6. The sewage treatment device integrating acidification treatment and microbial fuel cell according to claim 2, characterized in that: Each reaction chamber (19) is provided with an anode and a cathode.

7. The sewage treatment device integrating acidification treatment and microbial fuel cell according to claim 6, characterized in that: An electrode hole (6) is provided above each reaction chamber (19), and an air cathode ventilation hole (18) is provided on the outer side of each reaction chamber (19).

8. The sewage treatment device integrating acidification treatment and microbial fuel cell according to claim 1, characterized in that: An exhaust hole (3) is provided on the top of the first acidification box (101).

9. The sewage treatment device integrating acidification treatment and microbial fuel cell according to claim 1, characterized in that: An acidity sensor (16) is provided inside the acidification storage container (1), and a temperature sensor is also provided inside the microbial fuel cell power generation device (2).

10. The manure treatment device integrating acidification treatment and microbial fuel cell according to claim 1, characterized in that: The bottom of the first acidification box (101) is made of a transparent material, and an ultraviolet lamp (23) is installed on the bottom of the first acidification box (101).

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