CN216863748U - Microbial fuel cell for synchronous sewage treatment based on A2/O process - Google Patents
Microbial fuel cell for synchronous sewage treatment based on A2/O process Download PDFInfo
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- CN216863748U CN216863748U CN202220485746.6U CN202220485746U CN216863748U CN 216863748 U CN216863748 U CN 216863748U CN 202220485746 U CN202220485746 U CN 202220485746U CN 216863748 U CN216863748 U CN 216863748U
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The utility model relates to a microbial fuel cell for synchronous sewage treatment based on an A2/O process, which comprises a cell main body, wherein a cylindrical inner cavity is coaxially arranged in the cell main body, a separator is arranged in the cylindrical inner cavity, an anaerobic zone is formed in the separator, two separating blocks are arranged outside the separator, and the two separating blocks divide the part between the separator and the cylindrical inner cavity into an anoxic zone and an aerobic zone; the separator comprises a proton exchange membrane, the separator is provided with a first through hole, one of the separator blocks is provided with a second through hole, and the battery main body is provided with a first sewage backflow structure; the anaerobic zone is provided with an anode electrode, the aerobic zone is provided with a cathode electrode, and the outside of the battery body is provided with a resistor which is connected with the anode electrode and the cathode electrode; the aerobic zone is internally provided with suspended fillers and is provided with an aeration device; the anode area is provided with an activated sludge layer; the anaerobic zone is arranged at the sewage main inlet and is provided with a hydrogen outlet, and the battery main body is also provided with a sewage main outlet. The utility model can realize a novel wastewater treatment technology combining wastewater treatment and biological power generation.
Description
Technical Field
The utility model relates to the field of batteries, in particular to a microbial fuel cell.
Background
At present, the energy crisis and the environmental pollution are becoming more severe, threatening the survival and development of human beings. The development of renewable energy sources and the sustainable development path become the focus of research of various national researchers. Domestic sewage and part of industrial wastewater contain abundant organic chemical energy, but the traditional wastewater treatment process cannot fully utilize organic substances in the sewage. Microbial Fuel Cells (MFCs) are devices that convert chemical energy of organic matter into electrical energy that can be utilized using microorganisms as biocatalysts. If the technology is applied to wastewater treatment, the technology can output electric energy while purifying wastewater, and becomes a novel wastewater treatment technology combining wastewater treatment and biological power generation.
Disclosure of Invention
The utility model aims to provide a microbial fuel cell for synchronous sewage treatment based on an A2/O process, so as to realize a novel wastewater treatment technology combining wastewater treatment and biological power generation.
The utility model relates to a microbial fuel cell for synchronous sewage treatment based on an A2/O process, which comprises a cylindrical cell main body, wherein the whole cell main body extends along the vertical direction in an axial line manner, a cylindrical inner cavity is coaxially arranged in the cell main body, a whole cylindrical separating body is coaxially arranged in the cylindrical inner cavity, the inner side part of the separating body forms an anaerobic zone of the A2/O process, the outer wall of the separating body is provided with two separating blocks which are circumferentially distributed, and the two separating blocks divide the part between the separating body and the cylindrical inner cavity into an anoxic zone and an aerobic zone of the A2/O process; the part of the separator facing the anoxic zone comprises a proton exchange membrane for transferring protons from the anoxic zone to the aerobic zone, the part of the separator facing the anoxic zone is provided with a first through hole for passing sewage, one of the two separating blocks is provided with a second through hole for passing sewage, and the side wall of the cell main body is provided with a first sewage backflow structure for returning sewage from the anoxic zone to the anoxic zone; an anode electrode is arranged in the anaerobic zone, a cathode electrode is arranged in the aerobic zone, a resistor is arranged outside the battery main body, and the resistor is respectively connected with the anode electrode and the cathode electrode through leads; the aerobic zone is internally provided with suspended fillers, and the bottom of the aerobic zone is provided with an aeration device; the bottom of the anode region is provided with an activated sludge layer for producing hydrogen and electricity; the bottom of the anaerobic zone is arranged at a sewage main inlet, the top of the anaerobic zone is provided with a hydrogen outlet, and the side wall of the cell main body is also provided with a sewage main outlet communicated with the aerobic zone.
Further, still including supplying sewage from the outside second sewage backflow structure that flows in anaerobic zone, second sewage backflow structure includes the second back flow, the one end of second back flow runs through from bottom to top battery body's bottom and stretches into anaerobic zone, the other end of second back flow with the sewage main entrance is linked together, be equipped with the second backwash pump on the second back flow.
Furthermore, the first sewage backflow structure comprises a first backflow pipe, one end of the first backflow pipe penetrates through the side wall of the battery main body and is communicated with the aerobic zone, the other end of the first backflow pipe penetrates through the side wall of the battery main body and is communicated with the anoxic zone, and a first backflow pump is arranged on the first backflow pipe.
Further, the anode electrode is a graphite brush electrode.
Further, the cathode electrode is made of any one of graphite, glassy carbon, carbon black, carbon felt, carbon paper or carbon cloth.
Furthermore, the section of the cathode electrode in the horizontal direction is in a sector ring shape coaxial with the separator, the shape of the proton exchange membrane is matched with the side wall of the separator, the proton exchange membrane is arranged in the part, facing the cathode electrode, of the separator, a plurality of inner through holes (22) communicated with the proton exchange membrane are formed in the inner side wall of the separator, and a plurality of outer through holes communicated with the proton exchange membrane are formed in the outer side wall of the separator.
Furthermore, be equipped with agitating unit in the anoxic zone, agitating unit includes that the axis is the (mixing) shaft that extends from top to bottom, be equipped with the stirring leaf on the (mixing) shaft.
Further, the portion of the separator facing the anoxic zone and both of the separating blocks are made of plexiglass.
The utility model has the beneficial effects that the sewage entering the anaerobic zone is decomposed into protons, electrons and acid substances under the action of anaerobic microorganisms, the acid substances are fermented into hydrogen under the action of hydrogen-producing flora, and the hydrogen escapes from a hydrogen outlet and is collected by an external hydrogen collecting device; meanwhile, the electrogenic bacteria transfer electrons to the anode electrode, the electrons are transferred to the cathode electrode through an external circuit, and as the aeration device is arranged in the aerobic zone, oxygen generated by the aeration device is used as an electron acceptor of the cathode electrode, the electron oxidation-reduction potential of the oxygen is higher than that of the anode electrode in reaction, so that electric energy is output outwards to generate electricity; the protons enter the aerobic zone through the proton exchange membrane to combine with the oxygen to form water; substances such as ammonia nitrogen in the sewage generate electrochemical nitrification and denitrification under the action of the anode electrode, so that a certain total nitrogen removal effect is realized in the anaerobic zone; sewage in the aerobic zone flows back to the anoxic zone through the first sewage backflow structure to form denitrification nitrogen removal of an A2/O process, and a stirring device is arranged in the anoxic zone, so that the nitrogen removal efficiency is higher; after entering the aerobic zone, the sewage is in full contact reaction with microorganisms on the suspended filler under the action of an aeration device to remove COD, and then is subjected to nitrification and dephosphorization reactions, and finally overflows from a sewage main outlet. The microbial fuel cell for synchronous sewage treatment based on the A2/O process synchronously realizes the functions of hydrogen production and electricity generation and sewage treatment, and is cleaner and more environment-friendly.
Drawings
FIG. 1 is a schematic structural diagram of a microbial fuel cell for synchronous sewage treatment based on A2/O process according to the present invention;
fig. 2 is a cross-sectional view of AA in fig. 1.
In the figure, 1-a battery body, 2-a separator, 3-an anaerobic zone, 4-a separator, 5-an anoxic zone, 6-an aerobic zone, 7-a proton exchange membrane, 8-a first via hole, 9-a second via hole, 10-an anode electrode, 11-a cathode electrode, 12-a resistor, 13-a lead, 14-a suspension filler, 15-an aeration device, 16-a sewage total inlet, 17-a hydrogen outlet, 18-a second return pipe, 19-a second return pump, 20-a first return pipe, 21-a first return pump, 22-an inner via hole, 23-an outer via hole, 24-a stirring shaft, 25-a stirring blade, 26-a sewage total outlet.
Detailed Description
The utility model will be further explained with reference to the drawings.
The microbial fuel cell for synchronous sewage treatment based on the A2/O process is shown in figures 1 and 2, arrows in figures 1 and 2 indicate the flow direction of sewage, and comprises a cylindrical cell main body 1 which integrally extends along the vertical direction, a cylindrical inner cavity is coaxially arranged in the cell main body 1, a separator 2 which is integrally cylindrical is coaxially arranged in the cylindrical inner cavity, the inner side part of the separator 2 forms an anaerobic zone 3 of the A2/O process, two separating blocks 4 which are circumferentially distributed are arranged on the outer wall of the separator 2, and the part between the separator 2 and the cylindrical inner cavity is divided into an anoxic zone 5 and an aerobic zone 6 of the A2/O process by the two separating blocks 4; the part of the separator 2 facing the aerobic zone 6 comprises a proton exchange membrane 7 for transferring protons from the anoxic zone 5 to the aerobic zone 6, the part of the separator 2 facing the anoxic zone 5 is provided with a first through hole 8 for passing sewage, one of the two separating blocks 4 is provided with a second through hole 9 for passing sewage, and the side wall of the cell main body 1 is provided with a first sewage backflow structure for returning the sewage from the aerobic zone 6 to the anoxic zone 5; an anode electrode 10 is arranged in the anaerobic zone 3, a cathode electrode 11 is arranged in the aerobic zone 6, a resistor 12 is arranged outside the battery body 1, and the resistor 12 is respectively connected with the anode electrode 10 and the cathode electrode 11 through leads 13; a suspended filler 14 is arranged in the aerobic zone 6, and an aeration device 15 is arranged at the bottom of the aerobic zone 6; the bottom of the anode area is provided with an activated sludge layer for generating hydrogen and electricity; the bottom of the anaerobic zone 3 is arranged at a sewage main inlet 16, the top of the anaerobic zone 3 is provided with a hydrogen outlet 17, and the side wall of the cell main body 1 is also provided with a sewage main outlet 26 communicated with the aerobic zone 6. The anaerobic zone 3, the anoxic zone 5, the aerobic zone 6 and the first sewage backflow structure jointly form a complete basic device of an A2/O process, the microbial fuel cell based on the A2/O process and synchronous sewage treatment firstly inoculates an electrogenesis hydrogen-producing flora on an active sludge layer by using sewage as a substrate, and then carries out heat treatment on the activated sludge layer, specifically, methanogenic bacteria are limited, clostridium and thermoanaerobacterium are reserved, anaerobic fermentation is controlled in a hydrogen production stage, the sewage entering the anaerobic zone 3 is decomposed into protons, electrons and acid substances under the action of anaerobic microorganisms, the acid substances are fermented into hydrogen under the action of the hydrogen-producing flora, and the hydrogen escapes from a hydrogen outlet 17 and is collected by an external hydrogen collecting device; meanwhile, the electrogenic bacteria transfer electrons to the anode electrode 10, the electrons are transferred to the cathode electrode 11 through an external circuit, and as the aeration device 15 is arranged in the aerobic zone 6, oxygen generated by the aeration device 15 is used as an electron acceptor of the cathode electrode 11, the electron oxidation-reduction potential of the oxygen is higher than that of the anode electrode 10, and thus electric energy is output outwards to generate electricity; the protons enter the aerobic zone 6 through the proton exchange membrane 7 to combine with the oxygen to form water; substances such as ammonia nitrogen in the sewage generate electrochemical nitrification and denitrification under the action of the anode electrode 10, so that a certain total nitrogen removal effect is realized in the anaerobic zone 3; the sewage in the aerobic zone 6 flows back to the anoxic zone 5 through the first sewage backflow structure to form denitrification of an A2/O process; after entering the aerobic zone 6, the sewage is in full contact reaction with microorganisms on the suspended filler 14 under the action of the aeration device 15 to remove COD, and then is subjected to nitrification and dephosphorization reaction, and finally overflows from a sewage main outlet 26. Preferably, the adding amount of the suspended filler 14 is 60 to 80 percent of the effective volume of the aerobic zone 6; the aeration rate of the aeration device 15 is limited to the extent that the dissolved oxygen concentration in the moving bed biofilm reactor reaches 1-3 mg/L.
Preferably, the device further comprises a second sewage backflow structure for sewage to flow out from the anaerobic zone 3, the second sewage backflow structure comprises a second backflow pipe 18, one end of the second backflow pipe 18 penetrates through the bottom of the battery body 1 from bottom to top and extends into the anaerobic zone 3, the other end of the second backflow pipe 18 is communicated with a sewage main inlet 16, and a second backflow pump 19 is arranged on the second backflow pipe 18. By the second sewage circulating structure, the sewage flows out of the battery body 1 through the second return pipe 18 and is mixed with the newly introduced sewage to enter the anaerobic zone 3 from the sewage main inlet 16, and the reaction time and effect in the anaerobic zone 3 can be increased by this sewage circulating structure.
Preferably, the first sewage backflow structure comprises a first backflow pipe 20, one end of the first backflow pipe 20 penetrates through the side wall of the cell body 1 and is communicated with the aerobic zone 6, the other end of the first backflow pipe 20 penetrates through the side wall of the cell body 1 and is communicated with the anoxic zone 5, and a first backflow pump 21 is arranged on the first backflow pipe 20. The effluent is withdrawn from the aerobic zone 6 and fed to the anoxic zone 5 by a first return pump 21.
Preferably, the anode electrode 10 is a graphite brush electrode. The contact area of the graphite brush electrode is larger, and the electricity generating effect is better.
Preferably, the cathode electrode 11 is made of any one of graphite, glassy carbon, carbon black, carbon felt, carbon paper or carbon cloth. The graphite, glassy carbon and other materials have the advantages of convenient processing, high discharge removal rate, small loss and the like.
Preferably, the section of the cathode electrode 11 in the horizontal direction is in a sector ring shape coaxial with the separator 2, the shape of the proton exchange membrane 7 is adapted to the side wall of the separator 2, the proton exchange membrane 7 is arranged in the part of the separator 2 facing the cathode electrode 11, a plurality of inner through holes 22 communicated with the proton exchange membrane 7 are arranged on the inner side wall of the separator 2, and a plurality of outer through holes 23 communicated with the proton exchange membrane 7 are arranged on the outer side wall of the separator 2. The section of the cathode electrode 11 in the horizontal direction is in a sector ring shape coaxial with the separator 2, the whole body is a curved surface, the contact area is larger, and the electricity generating effect is better. The proton exchange membrane 7 is arranged in the separator 2, has a more stable structure, and transfers protons through the inner via hole 22 and the outer via hole 23.
Preferably, a stirring device is arranged in the anoxic zone 5, the stirring device comprises a stirring shaft 24 with an axis extending in the vertical direction, and the stirring shaft 24 is provided with a stirring blade 25. The anoxic zone 5 is stirred by the stirring device, so that the sewage and the microorganisms are fully mixed, and the denitrification efficiency is higher.
Preferably, the part of the separating body 2 facing the anoxic zone 5 and the two separating blocks 4 are made of plexiglass. Plexiglass is a preferred.
The implementation mode of the utility model is that firstly, the active sludge layer is inoculated with an electrogenesis hydrogen-producing flora, then the active sludge layer is subjected to heat treatment, specifically, methanogenic bacteria are limited, clostridium and thermoanaerobium are reserved, anaerobic fermentation is controlled in a hydrogen production stage, sewage entering an anaerobic zone 3 is decomposed into protons, electrons and acid substances under the action of anaerobic microorganisms, the acid substances are fermented into hydrogen under the action of the hydrogen-producing flora, and the hydrogen escapes from a hydrogen outlet 17 and is collected by an external hydrogen collecting device; meanwhile, the electrogenic bacteria transfer electrons to the anode electrode 10, the electrons are transferred to the cathode electrode 11 through an external circuit, and as the aeration device 15 is arranged in the aerobic zone 6, oxygen generated by the aeration device 15 is used as an electron acceptor of the cathode electrode 11, the electron oxidation-reduction potential of the oxygen is higher than that of the anode electrode 10, and thus electric energy is output outwards to generate electricity; the protons enter the aerobic zone 6 through the proton exchange membrane 7 to combine with the oxygen to form water; substances such as ammonia nitrogen in the sewage generate electrochemical nitrification and denitrification under the action of the anode electrode 10, so that a certain total nitrogen removal effect is realized in the anaerobic zone 3; the sewage in the aerobic zone 6 flows back to the anoxic zone 5 through the first sewage backflow structure to form denitrification of an A2/O process, and a stirring device is arranged in the anoxic zone 5, so that the denitrification efficiency is higher; after entering the aerobic zone 6, the sewage is in full contact reaction with microorganisms on the suspended filler 14 under the action of the aeration device 15 to remove COD, and then is subjected to nitrification and dephosphorization reaction, and finally overflows from a sewage main outlet 26. The microbial fuel cell for synchronous sewage treatment based on the A2/O process synchronously realizes the functions of hydrogen production and electricity generation and sewage treatment, and is cleaner and more environment-friendly. Preferably, the hydraulic retention time of the sewage in the anaerobic zone is 2-3 hours, the hydraulic retention time of the sewage in the anoxic zone is 1.5-2 hours, and the hydraulic retention time of the sewage in the aerobic zone is 7-8 hours.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (8)
1. A microbial fuel cell for synchronous sewage treatment based on an A2/O process is characterized by comprising a cylindrical cell main body (1) which integrally extends in the vertical direction along the axis, a cylindrical inner cavity is coaxially arranged in the cell main body (1), a cylindrical separator (2) which is integrally cylindrical is coaxially arranged in the cylindrical inner cavity, the inner side part of the separator (2) forms an anaerobic zone (3) of the A2/O process, two separation blocks (4) which are circumferentially distributed are arranged on the outer wall of the separator (2), and the part between the separator (2) and the cylindrical inner cavity is divided into an anoxic zone (5) and an aerobic zone (6) of the A2/O process by the two separation blocks (4); the part, facing the aerobic zone (6), of the separator (2) comprises a proton exchange membrane (7) for proton transfer from the anoxic zone (5) to the aerobic zone (6), the part, facing the anoxic zone (5), of the separator (2) is provided with a first through hole (8) for sewage to pass through, one of the two separating blocks (4) is provided with a second through hole (9) for sewage to pass through, and the side wall of the cell main body (1) is provided with a first sewage backflow structure for sewage to flow back from the aerobic zone (6) to the anoxic zone (5); an anode electrode (10) is arranged in the anaerobic zone (3), a cathode electrode (11) is arranged in the aerobic zone (6), a resistor (12) is arranged outside the battery body (1), and the resistor (12) is respectively connected with the anode electrode (10) and the cathode electrode (11) through leads (13); a suspended filler (14) is arranged in the aerobic zone (6), and an aeration device (15) is arranged at the bottom of the aerobic zone (6); the bottom of the anode area is provided with an activated sludge layer for producing hydrogen and electricity; the bottom of the anaerobic zone (3) is arranged at a sewage main inlet (16), the top of the anaerobic zone (3) is provided with a hydrogen outlet (17), and a sewage main outlet (26) communicated with the aerobic zone (6) is also arranged on the side wall of the cell main body (1).
2. The microbial fuel cell for synchronous sewage treatment based on the A2/O process according to claim 1, further comprising a second sewage backflow structure for sewage to flow out from the anaerobic zone (3), wherein the second sewage backflow structure comprises a second backflow pipe (18), one end of the second backflow pipe (18) penetrates through the bottom of the cell body (1) from bottom to top and extends into the anaerobic zone (3), the other end of the second backflow pipe (18) is communicated with the sewage main inlet (16), and a second backflow pump (19) is arranged on the second backflow pipe (18).
3. The microbial fuel cell for synchronous sewage treatment based on the A2/O process according to claim 1, wherein the first sewage backflow structure comprises a first backflow pipe (20), one end of the first backflow pipe (20) penetrates through the side wall of the cell body (1) and is communicated with the aerobic zone (6), the other end of the first backflow pipe (20) penetrates through the side wall of the cell body (1) and is communicated with the anoxic zone (5), and a first backflow pump (21) is arranged on the first backflow pipe (20).
4. The microbial fuel cell for synchronous wastewater treatment based on A2/O process according to claim 1, wherein the anode electrode (10) is a graphite brush electrode.
5. The microbial fuel cell for synchronous wastewater treatment based on A2/O process according to claim 1, wherein the cathode electrode (11) is made of any one of graphite, glassy carbon, carbon black, carbon felt, carbon paper or carbon cloth.
6. The microbial fuel cell for the synchronous sewage treatment based on the A2/O process of claim 1, wherein the cross section of the cathode electrode (11) in the horizontal direction is in a fan-ring shape coaxial with the separator (2), the shape of the proton exchange membrane (7) is adapted to the side wall of the separator (2), the proton exchange membrane (7) is arranged in the part of the separator (2) facing the cathode electrode (11), the inner side wall of the separator (2) is provided with a plurality of inner through holes (22) communicated with the proton exchange membrane (7), and the outer side wall of the separator (2) is provided with a plurality of outer through holes (23) communicated with the proton exchange membrane (7).
7. The microbial fuel cell for synchronous sewage treatment based on the A2/O process according to claim 1, wherein a stirring device is arranged in the anoxic zone (5), the stirring device comprises a stirring shaft (24) with an axis extending in the up-down direction, and stirring blades (25) are arranged on the stirring shaft (24).
8. The microbial fuel cell for the simultaneous effluent treatment based on the a2/O process of claim 1, wherein the portion of the separator (2) facing the anoxic zone (5) and both of the separation blocks (4) are made of plexiglass.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220485746.6U CN216863748U (en) | 2022-03-08 | 2022-03-08 | Microbial fuel cell for synchronous sewage treatment based on A2/O process |
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| CN202220485746.6U CN216863748U (en) | 2022-03-08 | 2022-03-08 | Microbial fuel cell for synchronous sewage treatment based on A2/O process |
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| CN202220485746.6U Active CN216863748U (en) | 2022-03-08 | 2022-03-08 | Microbial fuel cell for synchronous sewage treatment based on A2/O process |
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- 2022-03-08 CN CN202220485746.6U patent/CN216863748U/en active Active
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