CN115159662A - Microbial fuel cell with cathode without power oxygenation and using method thereof - Google Patents

Microbial fuel cell with cathode without power oxygenation and using method thereof Download PDF

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Publication number
CN115159662A
CN115159662A CN202210164118.2A CN202210164118A CN115159662A CN 115159662 A CN115159662 A CN 115159662A CN 202210164118 A CN202210164118 A CN 202210164118A CN 115159662 A CN115159662 A CN 115159662A
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cathode
water
chamber
anode
cavity structure
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唐新华
姚晃
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/005—Combined electrochemical biological processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/16—Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The invention relates to a cathode unpowered oxygenation microbial fuel cell and a using method thereof, wherein the cathode unpowered oxygenation microbial fuel cell comprises an anode chamber, a cathode chamber and an ion exchange membrane arranged between the anode chamber and the cathode chamber; an anode is arranged in the anode chamber, a cathode is arranged in the cathode chamber, and the anode and the cathode form a loop through an external lead; the upper side of the cathode chamber is communicated with a cavity structure, the upper end of the cavity structure is open and communicated with the atmosphere, and a plurality of water dropping plates are horizontally arranged in the cavity structure from top to bottom in sequence; one end of each water dropping plate is arranged at intervals with the side wall of the cavity structure to form first channels, the first channels are staggered, and the other end parts of the water dropping plates are hermetically connected with the side wall of the cavity structure; adjacent drop plates are arranged at intervals to form a second channel, and the first channel and the second channel are sequentially communicated to form a drop oxygen charging area. According to the invention, the catholyte continuously drops through the water dropping plate and flows into the cathode chamber after being oxygenated, so that the dissolved oxygen concentration of the catholyte can be effectively improved, membrane pollution is reduced, and the power density of electricity generation is improved.

Description

Microbial fuel cell with cathode without power oxygenation and using method thereof
Technical Field
The invention belongs to the field of water pollution treatment, and particularly relates to a cathode unpowered oxygen-charging microbial fuel cell and a use method thereof.
Background
Microbial Fuel Cells (MFCs) are an environmental biotechnology that directly converts chemical energy into electrical energy by degrading organic matters in sewage through Microbial catalysis. The technology can generate electric energy while purifying sewage, so the technology is a green sewage treatment technology. The basic working principle of the MFC taking oxygen as an electron acceptor is that anode microorganisms degrade organic matters to release electrons and protons under the anaerobic condition, the electrons reach a cathode through an external circuit, the protons reach the cathode through an ion exchange membrane, and the oxygen of the cathode combines the electrons and the protons to react to generate water. At present, MFC is generally oxygenated by adopting a mechanical aeration mode, but the method needs continuous aeration and has high energy consumption. Patents [ yellow clouds; roc of the beam; making Wenwangcheng; a biological cathode natural oxygenation microbial fuel cell CN 1023245843B is a new biological cathode natural oxygenation microbial fuel cell CN 1023245843B, which provides a method without mechanical aeration, wherein oxygenation is performed in a trickling filtration mode, but the dissolved oxygen concentration is low (3.6-3.9 mg/L), and the existence of a cathode granular electrode and a cathode biological membrane easily causes chemical pollution and biological pollution of an ion exchange membrane, the membrane internal resistance is increased sharply (increased by 67.6 omega), and the electricity generation power density is low (28.6-118.1W/m) 3 ) And the like. Therefore, there is a great need to develop a new unpowered oxygenation technology, making MFC a more environmentally friendly sewage treatment technology.
Disclosure of Invention
The invention aims to overcome the technical defects and provide a microbial fuel cell with a cathode being subjected to unpowered oxygenation and a using method thereof, so that the energy consumption required by conventional mechanical aeration oxygenation is saved, and the electricity-generating power density is high.
In order to achieve the technical purpose, the technical scheme of the fuel cell is as follows:
the ion exchange membrane is arranged between the anode chamber and the cathode chamber; an anode chamber water inlet and an anode chamber water outlet are formed in the anode chamber, an anode is arranged in the anode chamber, a cathode chamber water outlet is formed in the cathode chamber, a cathode is arranged in the cathode chamber, and the anode and the cathode form a loop through an external lead;
the upper side of the cathode chamber is communicated with a cavity structure, the upper end of the cavity structure is open and communicated with the atmosphere, and a plurality of water dropping plates are sequentially arranged in the cavity structure from top to bottom; at least one end of each water dropping plate is arranged at intervals with the side wall of the cavity structure to form a first channel; the adjacent water dropping plates are arranged at intervals to form a second channel, and the first channel and the second channel are sequentially communicated to form a water dropping oxygen charging area; the upper part of the cavity structure is provided with a cathode chamber water inlet which is higher than the water dropping plate at the topmost part.
Further, drop the material of board and be aluminum alloy or organic glass.
Further, the drop plate is a flat plate or a folded plate; only one end of each water dropping plate is arranged at intervals with the side wall of the cavity structure, other end parts of the water dropping plates are hermetically connected with the side wall of the cavity structure, and formed first channels are arranged in a staggered manner; an included angle of 0-5 degrees is formed between the water dropping plate and the horizontal plane, and when the included angle is larger than 0 degree, the end part arranged at an interval with the side wall of the cavity structure is positioned at the lower side.
Furthermore, the number of the water dropping plates is 2-5, the height difference between the adjacent water dropping plates is 100-400mm, and the gap between the water dropping plate and the side wall of the water dropping oxygen charging area is 50-100 mm.
Furthermore, water falling holes are formed in the water falling plate, a water retaining weir plate is arranged at the end part of the water falling plate spaced from the side wall of the cavity structure, the diameter of each water falling hole is 2-5mm, and gaps between every two adjacent water falling holes and between the water falling holes and the water retaining weir plate are 10-20 mm.
Furthermore, a water passing pore plate is arranged between the cavity structure and the cathode chamber, and a plurality of water passing holes are uniformly arranged on the water passing pore plate.
Furthermore, the diameter of the water through hole is 1-20 mm.
Further, both the anode and the cathode are graphite felt.
Furthermore, the water inlet of the anode chamber is positioned below the water outlet of the anode chamber; the anode chamber is communicated with an anaerobic tank of an urban sewage treatment plant and is used for anode inoculation of anaerobic sludge; the cathode chamber adopts domestic wastewater as catholyte.
The invention also provides a technical scheme of a using method of the cathode unpowered oxygen charging microbial fuel cell, which comprises the following steps: the method comprises the following steps:
(1) Firstly, inoculating anaerobic sludge domestic sewage in an anode chamber, carrying out mechanical aeration or drop oxygenation on the sewage in a cathode chamber, connecting a cathode and an anode through an external circuit and externally connecting a resistor, and operating in a sequencing batch mode for 7-10 days to form a biological membrane on the surface of the anode;
(2) Stopping cathode mechanical aeration, carrying out continuous flow sewage treatment, enabling sewage to enter the anode chamber from the water inlet of the anode chamber, performing anode microbial degradation to generate electricity, enabling the sewage to flow out from the water outlet of the anode chamber, then sending the sewage into the cavity structure through the cathode water inlet, enabling the sewage to flow into the cathode chamber through the water dropping and oxygen charging area to provide dissolved oxygen for electricity generation of the microbial fuel cell, simultaneously performing aerobic degradation, and enabling the sewage to flow out from the water outlet of the cathode chamber.
Compared with the prior art, the invention has the beneficial effects that:
the water drop oxygenation area arranged in the invention comprises a plurality of water drop plates which are arranged at intervals, the height of the water drop oxygenation area is adjustable, the upper part of the water drop oxygenation area is completely open and is communicated with the atmosphere, catholyte enters from a water inlet of the cathode chamber and flows into the cathode chamber after being subjected to continuous water drop oxygenation through the water drop plates, and the unpowered oxygenation effect is achieved. The invention adopts drop water oxygenation, effectively improves the concentration of dissolved oxygen of catholyte (reaching 5.0mg/L or even higher), reduces membrane pollution, and improves the power density (reaching 124.6W/m) 3 Above), a large amount of energy consumption required by the traditional mechanical aeration oxygenation is saved, sufficient dissolved oxygen can be provided for the oxygen reduction reaction on the surface of the cathode, and meanwhile, the change of the internal resistance of the membrane is small (only 6 omega is increased or even lower after the membrane is operated for three months), so that the microbial fuel cell energy-saving technology has wide application value.
Furthermore, the aperture of the drop holes, the hole gaps, the number of the drop plates and the height difference of the drop plates on the drop plate are adjustable, and the oxygenation capacity of the drop is controlled by adjusting the aperture of the drop holes, the hole gaps and the number and the height difference of the drop plates on the drop plate.
Furthermore, the water passing pore plate is provided with small pores (the diameter is 1-20 mm) with adjustable pore diameters, so that drop water oxygenation and uniform water distribution are optimized.
Drawings
FIG. 1 is a schematic view of a cathode unpowered aerobic microbial fuel cell according to the present invention.
FIG. 2 is a schematic view of the cathode unpowered aerobic microbial fuel cell with the water-retaining weir plate added according to the present invention.
FIG. 3 is a top view of the drop aeration zone of the present invention.
The labels in the figure are: 1-anode chamber, 2-anode chamber water outlet, 3-anode, 4-anode chamber water inlet, 5-lead, 6-ion exchange membrane, 7-cathode chamber water inlet, 8-water dropping plate, 9-water dropping oxygen charging area, 10-water passing pore plate, 11-cathode chamber, 12-cathode, 13-cathode chamber water outlet, 14-water blocking weir plate and 15-water dropping hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the present invention comprises an anode chamber 1 and a cathode chamber 11, wherein an ion exchange membrane 6 is arranged between the anode chamber 1 and the cathode chamber 11, and the anode chamber 11 is separated from the anode chamber 1 by the ion exchange membrane 6; the lower end and the upper end of the anode chamber 1 are respectively provided with an anode chamber water inlet 4 and an anode chamber water outlet 2, the anode chamber water inlet 4 is positioned below the anode chamber water outlet 2, and an anode 3 is arranged in the anode chamber 1.
A cathode chamber water outlet 13 is formed in the cathode chamber 11, a cathode 12 is installed in the cathode chamber 11, and the anode 3 and the cathode 12 form a loop through an external lead.
The upper side of the cathode chamber 11 is communicated with a cavity structure, the upper end of the cavity structure is open and communicated with the atmosphere, and a plurality of water dropping plates 8 are sequentially arranged in the cavity structure from top to bottom; at least one end of each water dropping plate 8 is arranged at intervals with the side wall of the cavity structure, for example, one end, two opposite ends or three adjacent ends are arranged at intervals with the side wall of the cavity structure to form a first channel. Preferably, only one end of each water dropping plate 8 is arranged at a distance from the side wall of the cavity structure, and the other ends of the water dropping plates 8 are hermetically connected with the side wall of the cavity structure, so that the formed first channels are staggered.
The adjacent water dropping plates 8 are arranged at intervals to form a second channel, and the first channel and the second channel are sequentially communicated to form a water dropping oxygenation area 9; the upper part of the cavity structure is provided with a cathode chamber water inlet 7, and the cathode chamber water inlet 7 is higher than the topmost water dropping plate 8.
Specifically, the first channels may be uniformly located at opposite side walls in the cavity structure, and at this time, the drop aeration zone 9 of the present invention is an S-shaped channel structure; the first channel can also be positioned at the adjacent side wall in the cavity structure, and the drop water oxygenation zone 9 is a circular spiral structure.
The anode 3 is graphite felt, anaerobic sludge is inoculated, and a biological film is formed on the surface of the anode 3 by microorganisms for about 7-10 days. The cathode 12 is made of graphite felt, and oxygen in the catholyte flowing from the top of the cathode is subjected to reduction reaction on the electrode and then discharged from a water outlet 13 of the cathode chamber. Specifically, the anode chamber 1 is communicated with an anaerobic tank of an urban sewage treatment plant and is used for anode inoculation of anaerobic sludge; the cathode chamber 11 uses domestic wastewater as catholyte.
As a preferred embodiment, as shown in fig. 2 and 3, the water dropping plate 8 is provided with water dropping holes 15, and the end part of the water dropping plate 8 spaced from the side wall of the cavity structure is provided with a water blocking weir plate 14, preferably a wave-shaped weir plate composed of a plurality of triangular weirs, so as to facilitate uniform water discharge when the water amount is too large; the aperture of the water falling holes 15 is 2-5mm, the gaps between the adjacent water falling holes 15 and between the water falling holes 15 and the water baffle weir plate 14 are 10-20mm, and the water baffle weir plate 14 can block the catholyte so that the catholyte falls onto the next-stage water falling plate 8 through the water falling holes 15, the contact area with air is increased more effectively, and the oxygen content is increased.
The number of the water dropping plates 8 is 2-5, the height difference between the adjacent water dropping plates 8 is 100-400mm, and the gap between the water dropping plate 8 and the side wall of the cavity structure is 50-100 mm. By the arrangement, the height of the drop water oxygenation area 9 is adjustable, the upper part of the drop water oxygenation area is completely open and communicated with the atmosphere, and an adequate oxygen source is provided for the drop water area and the catholyte oxygenation.
Drop board 8's material is aluminum alloy or organic glass, and the shape is flat board or folded plate, has 0 ~ 5 contained angle between drop board and the horizontal plane, and when this contained angle was greater than 0, drop board 8 relative horizontal plane slope setting this moment, and its tip with cavity structure lateral wall interval setting is located the downside. The aperture and the hole clearance of the water dropping holes 15 on the water dropping plate 8 can be adjusted, meanwhile, the number and the height difference of the water dropping plates 8 can also be adjusted, and the water dropping oxygenation capacity is controlled by adjusting the aperture (2-5 mm) and the hole clearance (10-20 mm) of the water dropping plates 8, the number (2-5) of the water dropping plates 8 and the height difference (100-400 mm) of the adjacent water dropping plates 8.
A water passing pore plate 10 is arranged between the cavity structure and the cathode chamber 11, and a plurality of water passing holes are uniformly arranged on the water passing pore plate 10. The diameter of the water through hole is 1-20 mm. The water passing pore plate 10 is provided with a small pore (the diameter is 1-20 mm) with adjustable pore diameter, so as to optimize drop water oxygenation and uniformly distribute water.
The main working process and principle of the invention are as follows: a water drop oxygenation area 9 is arranged above the cathode chamber 11; after being processed by the anode, the sewage flows in from the water inlet 7 of the cathode chamber, is oxygenated by a series of water drops, oxygen in the air is transferred to catholyte, and finally flows into the cathode chamber 11 uniformly through the water pore plate 10 to provide enough dissolved oxygen for the oxygen reduction reaction of the cathode, so that the microbial fuel cell becomes a more environment-friendly sewage treatment biotechnology.
The use method of the microbial fuel cell comprises the following steps:
(1) Firstly, anaerobic sludge domestic sewage is inoculated in the anode chamber 1, the sewage in the cathode chamber is subjected to mechanical aeration (drop water oxygenation can also be directly adopted), the cathode and the anode are connected through an external circuit, a 1000-ohm resistor is externally connected, and a mature and stable biological membrane is formed on the surface of the anode 3 after the sequential batch operation for 7-10 days;
(2) Stopping cathode mechanical aeration, carrying out continuous flow sewage treatment, enabling sewage to be treated to enter an anode chamber 1 from an anode chamber water inlet 4, flowing out from an anode chamber water outlet 2 after being degraded by anode microorganisms, then sending into a cavity structure through a cathode chamber water inlet 7, flowing into a cathode chamber 11 through a water dropping and oxygen charging area 9, providing dissolved oxygen for power generation of the microbial fuel cell, and then flowing out through a cathode chamber water outlet 13;
(3) The sewage is subjected to anaerobic degradation by the anode to generate electricity, then flows into the cathode to provide dissolved oxygen for the microbial fuel cell, and is subjected to aerobic degradation. Thus, the anaerobic and aerobic treatment of the sewage is completed, the electric energy is recovered through an external circuit, and the energy consumption required by the cathode mechanical aeration is also avoided.
The present invention will be described in further detail below with reference to specific application examples.
Application example one
The method comprises the steps of arranging 4 water drop plates, wherein the aperture of each water drop hole in each water drop plate is 2mm, the hole gap is 20mm, the height difference between every two adjacent water drop plates is 200mm, the gap between each water drop plate 8 and the side wall of the cavity structure is 80mm, the aperture in each water passing hole plate is 3mm, the water inlet flow rate of a cathode and the water inlet flow rate of an anode are both 150mL/min, the anode of a microbial fuel cell is inoculated with anaerobic tank activated sludge of a municipal sewage treatment plant, cathode liquid is actual municipal domestic sewage (COD =220mg/L, ammonia nitrogen 30mg/L and total phosphorus 7 mg/L) and sodium acetate simulation wastewater (COD =200 mg/L), after 7-10 days, the anode forms a mature biomembrane, at the moment, the municipal domestic sewage or the simulation wastewater is introduced into the anode chamber, is reduced in the anode chamber, then is conveyed to the water inlet of the cathode chamber through the water outlet of the anode chamber, and enters the cathode chamber, and the microbial fuel cell stably generates electricity.
The dissolved oxygen concentration of the sewage at different positions in the cathode chamber is 4.6-6.1mg/L (the cathode chamber is oxygen-consuming reaction, oxygen-enriched sewage is just entering the cathode chamber, the dissolved oxygen concentration is highest, and the dissolved oxygen concentration is lowest at the water outlet of the cathode chamber), and the electricity-generating power density of the microbial fuel cell using the simulated wastewater and the actual urban domestic sewage as substrates can respectively reach 252.6W/m 3 、136.2W/m 3 The membrane pollution is slight in the operation process, and the membrane internal resistance is increased by only 5.9 omega after the operation for 3 months. The COD of the effluent is 26mg/L, and the removal rate of the COD is 88.2 percent; 2.6mg/L of ammonia nitrogen in effluent and 91.3% of ammonia nitrogen removal rate; the total phosphorus in the effluent is 0.39mg/L, and the total phosphorus removal rate is 94.4 percent. The three effluent water quality indexes reach the first-class A standard in discharge Standard of pollutants for municipal wastewater treatment plants (GB 18918-2002).
These data show that the drop oxygenation effect of the invention is obviously improved compared with the trickling filtration oxygenation adopted in the microbial fuel cell CN 1023245843B with natural oxygenation of a biological cathode, the long-term stable operation of the microbial fuel cell can be effectively ensured, and meanwhile, the sewage treatment effect is excellent, thus the drop oxygenation method is particularly suitable for sewage with single component.
Application example two
As shown in FIG. 1, the water drop holes and the water baffle are not arranged, other conditions are the same as the application example I, the dissolved oxygen concentration of the sewage at different positions in the cathode chamber is 2.7-5.0mg/L, and the electricity generation power density of the microbial fuel cell is 124.6W/m 3 The membrane pollution is slight in the operation process, and the membrane internal resistance is increased by only 6.0 omega after 3 months of operation. The COD removal rate of the effluent is 41mg/L and 81.4 percent; 2.9mg/L of ammonia nitrogen in effluent, and the removal rate of the ammonia nitrogen is 90.3 percent; the total phosphorus in the effluent is 0.58mg/L, and the total phosphorus removal rate is 91.7 percent.
Comparative example 1
The water drop plate and the water passing hole plate are not arranged, other conditions are the same as the application example one, and under the same flow rate, the electricity generating power density of the microbial fuel cell taking urban domestic wastewater (COD =220mg/L, ammonia nitrogen 30mg/L and total phosphorus 7 mg/L) as a substrate is 15.2W/m 3 The dissolved oxygen concentration of the solution in different positions in the cathode chamber is 0.5-3.6mg/L. Meanwhile, effluent COD is 157mg/L, and the removal rate of the COD is 28.6 percent; the ammonia nitrogen in the effluent is 13mg/L, and the ammonia nitrogen removal rate is 56.6 percent; the total phosphorus in the effluent is 3.8mg/L, and the total phosphorus removal rate is 45.7 percent. Comparing the two cases, the arrangement of the water drop plate and the water passing pore plate is explained, and the cathode dissolved oxygen, the electricity generation power density and the sewage treatment effect of the microbial fuel cell are greatly improved.
Comparative example No. two
The aperture of the water drop plate is 10mm, the other conditions are the same as the application example one, the dissolved oxygen concentration of the sewage at different positions in the cathode chamber is 2.6-4.8mg/L, and the electricity generating power density of the microbial fuel cell is 76.8W/m 3 The COD removal rate of the effluent is 86mg/L and 60.9 percent; the ammonia nitrogen in the effluent is 8.9mg/L, and the ammonia nitrogen removal rate is 70.3 percent; the total phosphorus in the effluent is 1.7mg/L, and the total phosphorus removal rate is 75.7 percent. Compared with the first application example, the quality of the three effluent water is much worse. The main reason is that the aperture size of the drop plate can affect the oxygenation capacity of the drop.
As can be seen from the above, the drop oxygenation area provided by the invention comprises a plurality of drop plates which are arranged at intervals, the height of the drop plates is adjustable, the upper part of the drop plates is completely open and is communicated with the atmosphere, catholyte enters from a water inlet of the cathode chamber, and flows into the cathode chamber after being subjected to continuous drop oxygenation through drop holes of the drop plates so as to achieve the purpose of no movementThe effect of forced oxygenation. The invention adopts drop water oxygenation to effectively improve the concentration of dissolved oxygen of catholyte (2.7-6.1 mg/L, up to 4.6-6.1 mg/L), reduce membrane pollution and improve the power density (up to 124.6-252.6W/m) 3 ) The microbial fuel cell saves a large amount of energy consumption required by the traditional mechanical aeration oxygenation, can provide sufficient dissolved oxygen for the oxygen reduction reaction on the surface of the cathode, has small change of membrane internal resistance (only increases 5.9 omega after running for three months), and is a microbial fuel cell energy-saving technology with wide application value.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The cathode unpowered oxygenation microbial fuel cell is characterized by comprising an anode chamber and a cathode chamber, wherein an ion exchange membrane is arranged between the anode chamber and the cathode chamber; an anode chamber water inlet and an anode chamber water outlet are formed in the anode chamber, an anode is arranged in the anode chamber, a cathode chamber water outlet is formed in the cathode chamber, a cathode is arranged in the cathode chamber, and the anode and the cathode form a loop through an external lead;
the upper side of the cathode chamber is communicated with a cavity structure, the upper end of the cavity structure is open and communicated with the atmosphere, and a plurality of water dropping plates are sequentially arranged in the cavity structure from top to bottom; at least one end of each water dropping plate is arranged at intervals with the side wall of the cavity structure to form a first channel; the adjacent water dropping plates are arranged at intervals to form a second channel, and the first channel and the second channel are sequentially communicated to form a water dropping oxygen charging area; the upper part of the cavity structure is provided with a cathode chamber water inlet which is higher than the water dropping plate at the topmost part.
2. The cathode unpowered aerobic microbial fuel cell according to claim 1, wherein the drop plate is made of aluminum alloy or organic glass.
3. The cathode unpowered oxygenated microbial fuel cell of claim 1, wherein the drop plate is a flat plate or a folded plate; only one end of each water dropping plate is arranged at intervals with the side wall of the cavity structure, the other end parts of the water dropping plates are hermetically connected with the side wall of the cavity structure, and formed first channels are arranged in a staggered manner; an included angle of 0-5 degrees is formed between the water dropping plate and the horizontal plane, and when the included angle is larger than 0 degree, the end part arranged at an interval with the side wall of the cavity structure is positioned at the lower side.
4. The cathode unpowered aerobic microbial fuel cell according to claim 1 or 3, wherein the number of the drop plates is 2-5, the height difference between the adjacent drop plates is 100-400mm, and the gap between the drop plate and the side wall of the drop aeration zone is 50-100 mm.
5. The cathode unpowered aerobic microbial fuel cell according to claim 1 or 3, wherein the water dropping plate is provided with water dropping holes, the end part of the water dropping plate spaced from the side wall of the cavity structure is provided with a water blocking weir plate, the diameter of each water dropping hole is 2-5mm, and gaps between adjacent water dropping holes and between each water dropping hole and the water blocking weir plate are 10-20 mm.
6. The cathode unpowered oxygenated microbial fuel cell of claim 1, wherein: a water passing pore plate is arranged between the cavity structure and the cathode chamber, and a plurality of water passing holes are uniformly arranged on the water passing pore plate.
7. The cathode unpowered aerobic microbial fuel cell according to claim 6, wherein the diameter of the water through holes is 1-20 mm.
8. The cathode unpowered oxygenated microbial fuel cell of claim 1 wherein the anode and cathode are graphite felt.
9. The cathode unpowered oxygenated microbial fuel cell of claim 1 wherein the anode chamber water inlet is located below the anode chamber water outlet; the anode chamber is communicated with an anaerobic tank of an urban sewage treatment plant and is used for anode inoculation of anaerobic sludge; the cathode chamber adopts domestic wastewater as catholyte.
10. The method of claim 1, comprising the steps of:
(1) Firstly, inoculating anaerobic sludge domestic sewage in an anode chamber, mechanically aerating or drop oxygenating the sewage in a cathode chamber, connecting a cathode and an anode through an external circuit and externally connecting a resistor, and operating in a sequencing batch mode for 7-10 days to form a biological membrane on the surface of the anode;
(2) Stopping cathode mechanical aeration, carrying out continuous flow sewage treatment, enabling sewage to enter the anode chamber from the water inlet of the anode chamber, performing anode microbial degradation to generate electricity, enabling the sewage to flow out from the water outlet of the anode chamber, then sending the sewage into the cavity structure through the cathode water inlet, enabling the sewage to flow into the cathode chamber through the water dropping and oxygen charging area to provide dissolved oxygen for electricity generation of the microbial fuel cell, simultaneously performing aerobic degradation, and enabling the sewage to flow out from the water outlet of the cathode chamber.
CN202210164118.2A 2022-02-22 2022-02-22 Microbial fuel cell with cathode without power oxygenation and using method thereof Pending CN115159662A (en)

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CN106374127A (en) * 2016-09-22 2017-02-01 大连理工大学 Drop aeration type microbial fuel cell
CN206156855U (en) * 2016-11-01 2017-05-10 浙江水利水电学院 Drop aeration and integrated anti -pollution device of anaerobic treatment

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US20050208343A1 (en) * 2002-05-14 2005-09-22 Korea Institute Of Science And Technology Membraneless and mediatorless microbial fuel cell
CN105470546A (en) * 2016-01-04 2016-04-06 武汉理工大学 Method for recovering sulfur in wastewater by using microbial fuel cell
CN106374127A (en) * 2016-09-22 2017-02-01 大连理工大学 Drop aeration type microbial fuel cell
CN206156855U (en) * 2016-11-01 2017-05-10 浙江水利水电学院 Drop aeration and integrated anti -pollution device of anaerobic treatment

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