A microbial fuel cell circulation well system

Abstract

The application discloses a kind of microbial fuel cell circulating well systems, comprising: well body, pumping and injection water component and battery component.Septum is divided to form upper screen section and lower screen section by well body, pumping and injection water component is communicated with upper screen section and lower screen section, to realize the circulation of groundwater between the upper screen section and lower screen section of well body, battery component is set in upper screen section, battery component includes electrode structure, single-chamber cavity is equipped in electrode structure, one end of single-chamber cavity is communicated with gas delivery pump to be suitable for air inlet, so that the outer wall of electrode structure forms anode, the inner wall of electrode structure forms cathode, the electron generated by anode oxidation reaction does not need to pass through the resistance of external circuit, directly conducts to cathode, so as to reduce the loss of electron, so that battery component generates maximum current, so as to improve the oxidation degradation effect of organic matter in groundwater.Promote the degradation of organic pollutants by microorganisms, avoid the plugging of screen hole caused by bioremediation of organic pollutants.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil environment remediation, and particularly relates to a microbial fuel cell circulating well system. BACKGROUND

[0002] The groundwater circulating well remediation technology can combine various remediation technologies to be applied in the well to increase the groundwater influence radius, concentrate pollutants and realize the vertical regulation of groundwater. The main coupled remediation technologies include aeration technology, in-situ chemical oxidation technology, biological remediation technology and the like. However, the single hydraulic circulation has low remediation efficiency, and it is difficult to achieve the purpose and effect of short-period remediation. Therefore, the combination of the microbial enhanced remediation technology is an environmentally friendly and low-cost choice.

[0003] The bioelectrochemical technology is a promising technology, which can be applied in the groundwater pollution remediation, and the technology is easy to adapt to the existing groundwater circulating well setting. Therefore, the coupled application system of the bioelectrochemical technology and the groundwater circulating well technology has important environmental remediation potential.

[0004] The existing groundwater circulating well technology has slow degradation speed of the circulating well for the organic pollutants in the groundwater, and the large production of microorganisms or mineral precipitation is easy to cause the plugging of the circulating well screen hole, thereby affecting the normal operation of the circulating well. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the defects that the circulating well in the prior art has slow degradation speed for the organic pollutants in the groundwater, and the biological remediation process is easy to produce a large amount of biological membrane to cause biological plugging, so as to provide a microbial fuel cell circulating well system which can realize the efficient removal and conversion of pollutants.

[0006] To solve the above technical problems, the technical scheme of the present application is as follows:

[0007] The microbial fuel cell circulating well system comprises a well body, a water pumping and injecting assembly and a cell assembly; the top of the well body is provided with an end cover, and a packer is arranged in the well body, the packer is adapted to divide the well body into an upper screen section and a lower screen section, the side wall of the upper screen section is provided with upper screen holes, and the side wall of the lower screen section is provided with lower screen holes; one end of the water pumping and injecting assembly penetrates through the packer to extend to the cavity of the lower screen section, and the other end of the water pumping and injecting assembly is communicated with the cavity of the upper screen section, and the water pumping and injecting assembly is adapted to realize the water pumping and injecting circulation of the upper screen section and the lower screen section; the cell assembly comprises an electrode structure arranged in the upper screen section, a single-chamber cavity is arranged in the electrode structure, one end of the single-chamber cavity is communicated with a gas delivery pump to be adapted to introduce air, and the electrode structure comprises an electrode tube and an electrode disc, a first hollow cavity is formed in the electrode tube, the electrode disc is sleeved on the electrode tube, a second hollow cavity is formed in the electrode disc, and the first hollow cavity and the second hollow cavity are communicated to form the single-chamber cavity.

[0008] According to some embodiments of the present application, the electrode structure comprises an electrode tube and an electrode disc, a first hollow cavity is formed in the electrode tube, the electrode disc is sleeved on the electrode tube, a second hollow cavity is formed in the electrode disc, and the first hollow cavity and the second hollow cavity are communicated to form the single-chamber cavity.

[0009] According to some embodiments of the present application, the electrode tube and the electrode disc are both made of carbon-based materials.

[0010] According to some embodiments of the present application, the electrode disc is in a meshed disc structure, a plurality of electrode discs are arranged, and the electrode discs are sleeved on the electrode tube from top to bottom.

[0011] According to some embodiments of the present application, the electrode tube is in a U-shaped structure, one end of the electrode tube penetrates through the end cover to extend outside the well body and is communicated with the gas delivery pump, and the other end of the electrode tube is connected with an aeration structure.

[0012] According to some embodiments of the present application, the aeration structure comprises an aeration plate, the aeration plate is provided with a gas collecting cavity, the other end of the electrode tube is communicated with the gas collecting cavity, and the upper end surface of the aeration plate is provided with a plurality of aeration nozzles communicated with the gas collecting cavity.

[0013] According to some embodiments of the present application, the aeration nozzles are uniformly arranged on the upper end surface of the aeration plate, and the aeration nozzles are in a frustum shape.

[0014] According to some embodiments of the present application, the upper surface of the packer is fixedly mounted with a sludge tray, which is located below the battery assembly to accommodate anaerobic sludge.

[0015] According to some embodiments of the present application, the microbial fuel cell circulation well system further comprises a tail gas treatment assembly, which comprises a tail gas collection pipe, an air extraction pump and a gas separation device, the air extraction pump is arranged on the ground, one end of the tail gas collection pipe is arranged through the end cover to extend into the upper screen section, the other end of the tail gas collection pipe is in communication with the air inlet end of the air extraction pump, and the gas separation device is in communication with the air outlet end of the air extraction pump.

[0016] According to some embodiments of the present application, the gas separation device is adapted to separate and treat the tail gas, and one end of the single-chamber cavity is in communication with the oxygen output end of the gas separation device through the air supply pump.

[0017] The technical scheme of the present application has the following advantages:

[0018] 1. The microbial fuel cell circulation well system provided by the present application, the packer separates the well body to form an upper screen section and a lower screen section, the water extraction and injection assembly communicates the upper screen section and the lower screen section to realize the circulation of groundwater between the upper screen section and the lower screen section of the well body, the battery assembly is arranged in the upper screen section, the battery assembly comprises an electrode structure, a single-chamber cavity is arranged in the electrode structure, one end of the single-chamber cavity is in communication with an air supply pump to accommodate air, and the air directly contacts the electrode structure, so that the outer wall of the electrode structure forms an anode and the inner wall of the electrode structure forms a cathode, the cathode and the anode are directly connected without a wire, and the electrons generated by the oxidation reaction of the anode are directly transmitted to the cathode without passing through the resistance of an external circuit, thereby reducing the loss of electrons, generating maximum current of the battery assembly, and improving the oxidation and degradation effect of organic matter in the groundwater. The electroactive microorganisms in the groundwater are enriched on the outer surface of the electrode structure, i.e. the anode, and an electric field is formed on the surface of the electrode structure. The electric power is enhanced to promote the mixing and energy transmission between the microorganisms and the organic matter, so that the fixed microorganisms and the organic matter are resuspended, thereby enhancing the contact between the two, and the electrode structure promotes the biodegradation of the organic pollutants in the groundwater. The air is continuously introduced into the single-chamber cavity, and the oxygen in the air is reduced on the surface of the cathode as an electron acceptor to consume the electrons transferred from the anode, so as to promote the degradation of the organic pollutants by the microorganisms on the surface of the anode, avoid the blockage of the screen holes by the biofilm or activated sludge formed by the reproduction of the microorganisms, and prevent the blockage of the screen holes by the large accumulation of the microorganisms and the deposition of minerals in the screen holes.

[0019] 2. The microbial fuel cell circulation well system provided by the present application, the electrode structure comprises an electrode pipe and an electrode disc sleeved on the electrode pipe, a first hollow cavity of the electrode pipe and a second hollow cavity of the electrode disc are communicated to form a single-chamber air, and the electrode disc is arranged to increase the attachment area of the electroactive microorganisms, thereby improving the efficiency of biodegradation of the organic pollutants.

[0020] 3. The microbial fuel cell circulation well system provided by the present application, the groundwater extracted from the lower screen section is discharged into the upper screen section by the suction pump, the upper screen hole is arranged at the top side wall of the upper screen section, the groundwater rises from the bottom of the upper screen section to the upper screen hole for discharge, the electrode disc is arranged in a meshed disc structure, in the process of rising of the groundwater, the groundwater passes through the mesh holes of the electrode disc, and the electroactive microorganisms in the groundwater are attached to the electrode disc, so that the organic pollutants in the groundwater are biodegraded, and the sediment sludge formed after the degradation is deposited under the block of the mesh holes of the electrode disc, thereby avoiding the blockage of the upper screen hole caused by the sediment sludge after the oxidation degradation rising with the groundwater. A plurality of electrode discs are sleeved in a spaced manner from top to bottom, so as to improve the filtering capacity and effectively avoid the blockage of the upper screen hole.

[0021] 4. The microbial fuel cell circulation well system provided by the present application, the electrode pipe is arranged in a U-shaped pipe, and an aeration structure is connected to the other end of the electrode pipe, the arrangement of the U-shaped pipe can realize upward blowing, accelerate the lifting of the water level, promote the hydraulic circulation, at the same time, the aeration can blow off the soluble volatile organic pollutants, so as to accelerate the desorption of the adsorbed organic pollutants, and the oxygen in the air can enter the aquifer around the groundwater circulation well with the groundwater overflowing from the upper screen section, so as to promote the in-situ aerobic biodegradation of the organic pollutants in the aquifer and improve the degradation effect of the organic matter.

[0022] 5. The microbial fuel cell circulation well system provided by the present application, a sludge tray is fixedly installed on the upper surface of the packer, the sludge tray is used for loading the electroactive microorganism residues and the sediment of the organic pollutants falling from the electrode disc, an anaerobic environment is formed in the sludge tray to promote the growth of anaerobic microorganisms, so as to decompose the residues of the organic pollutants in the groundwater and realize the recycling of resources.

[0023] 6. The microbial fuel cell circulation well system provided by the present application, a tail gas treatment assembly is arranged to collect and separate the large amount of gas generated in the circulation well, the gas that can be reused is collected and utilized, so as to realize green production and avoid environmental pollution.

[0024] 7. The microbial fuel cell circulation well system provided by the present application, the tail gas in the circulation well is separated by the tail gas treatment assembly, and one end of the electrode structure is connected with the oxygen output end of the tail gas treatment assembly, so that the oxygen returns to the single-chamber cavity, the efficiency of the oxidation-reduction reaction is improved, and the other separated gases are used as resources. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0026] Figure 1 A simplified structure schematic diagram of the microbial fuel cell circulating well system in the working state is provided in some embodiments of the present application.

[0027] Figure 2 A simplified structure schematic diagram of the microbial fuel cell circulating well system is provided in some embodiments of the present application.

[0028] Figure 3 A structure schematic diagram of the battery assembly is provided in some embodiments of the present application.

[0029] Figure 4 A schematic diagram of microbial adhesion and oxidation when the battery assembly is running is provided in some embodiments of the present application.

[0030] Figure 5 A structure schematic diagram of the aeration assembly is provided in some embodiments of the present application.

[0031] Figure 6 A cross-sectional structure schematic diagram of the electrode disc of the battery assembly is provided in some embodiments of the present application.

[0032] Figure 7 A schematic diagram of the electrode tube and the electrode disc of the battery assembly in operation is provided in some embodiments of the present application.

[0033] BRIEF DESCRIPTION OF DRAWINGS 1, well body; 2, water pumping and injecting assembly; 3, battery assembly; 4, aeration assembly; 5, tail gas treatment assembly; 6, sludge tray; 11, upper screen section; 12, lower screen section; 13, packer; 14, end cap; 111, upper screen hole; 121, lower screen hole; 21, water pumping pipe; 22, water injecting pipe; 23, pumping and injecting pump; 31, electrode tube; 32, electrode disc; 41, aeration plate; 42, aeration nozzle; 51, tail gas collecting pipe; 52, air pump; 53, gas separation device. DETAILED DESCRIPTION

[0034] The technical solutions of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0035] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0038] Reference Figures 1 to 7 As shown in the drawings, the present application provides a microbial fuel cell circulating well system, comprising: a well body 1, a water pumping and injecting assembly 2 and a battery assembly 3; the top of the well body 1 is provided with an end cover 14, and a packer 13 is arranged in the well body 1, the packer 13 is adapted to divide the well body 1 into an upper screen section 11 and a lower screen section 12, the side wall of the upper screen section 11 is provided with upper screen holes 111, and the side wall of the lower screen section 12 is provided with lower screen holes 121; one end of the water pumping and injecting assembly 2 penetrates the packer 13 to extend to communicate with the cavity of the lower screen section 12, the other end of the water pumping and injecting assembly 2 communicates with the cavity of the upper screen section 11, and the water pumping and injecting assembly 2 is adapted to realize the water pumping and injecting circulation of the upper screen section 11 and the lower screen section 12; the battery assembly 3 comprises an electrode structure arranged in the upper screen section 11, a single-chamber cavity is arranged in the electrode structure, one end of the single-chamber cavity communicates with a gas conveying pump to adapt to the inlet of air, and the inner circumferential wall of the electrode structure is in contact connection with the cathode of the air introduced into the single-chamber cavity to form a potential difference, and electroactive microorganisms in underground water grow and attach to the outer circumferential wall of the electrode structure.

[0039] Specifically, refer to Figure 2 As shown in the figure, the packer 13 separates the well body 1 into the upper screen section 11 and the lower screen section 12, the pumping and injecting assembly 2 communicates the upper screen section 11 and the lower screen section 12 to realize the circulation of the underground water between the upper screen section 11 and the lower screen section 12 of the well body 1, the battery assembly 3 is arranged in the upper screen section 11, the battery assembly 3 includes an electrode structure, a single-chamber cavity is arranged in the electrode structure, one end of the single-chamber cavity is communicated with the air conveying pump to be suitable for the air to be introduced, and directly contacts with the electrode structure, so that the outer wall of the electrode structure forms an anode, the inner wall of the electrode structure forms a cathode, the cathode and the anode are directly conducted without the need of a wire connection, and the electrons generated by the anode oxidation reaction are directly conducted to the cathode without passing through the resistance of the external circuit, thereby reducing the electron loss, making the battery assembly 3 generate the maximum current, and thereby improving the oxidation and degradation effect of the organic matter in the underground water. The electroactive microorganisms in the underground water are enriched and produced on the outer surface of the electrode structure, i.e. the anode, and an electric field is formed on the surface of the electrode structure. The electric power enhancement can promote the mixing and energy transmission between the microorganisms and the organic matter, so that the fixed microorganisms and the organic matter are resuspended, thereby enhancing the contact between the two, and the electrode structure promotes the biodegradation of the organic pollutants in the underground water. The air is continuously introduced into the single-chamber cavity, and the oxygen in the air is reduced on the surface of the cathode as an electron acceptor to consume the electrons transferred from the anode, so as to promote the degradation of the organic pollutants by the microorganisms on the surface of the anode, avoid the blockage of the screen holes by the biofilm or active sludge formed by the reproduction of the microorganisms, and avoid the blockage of the screen holes caused by the large accumulation of the microorganisms and the deposition of the minerals in the screen holes.

[0040] It can be understood that the pumping and injecting assembly 2 includes a pumping pipe 21, a pumping and injecting pump 23 and an injecting pipe 22, wherein the pumping and injecting pump 23 is arranged on the ground, one end of the pumping pipe 21 is arranged through the end cap 14 and the packer 13 to extend into the lower screen section 12 and communicate with the inner cavity of the lower screen section 12, the other end of the pumping pipe 21 is communicated with the water inlet end of the pumping and injecting pump 23, and one end of the injecting pipe 22 is arranged through the end cap 14 to extend into the bottom of the upper screen section 11, and the other end of the injecting pipe 22 is communicated with the water outlet end of the pumping and injecting pump 23. The pumping and injecting assembly 2 realizes the mode of pumping from the lower and injecting from the upper, i.e. the underground water in the inner cavity of the lower screen section 12 is pumped out and injected into the upper screen section 11, the pressure in the inner cavity of the lower screen section 12 becomes smaller, the underground water in the aquifer layer enters the lower screen section 12 from the lower screen hole 121, and the underground water pumped out from the lower screen section 12 is injected into the bottom of the upper screen section 11 from the injecting pipe 22 through the pumping and injecting pump 23. It needs to be explained that the injecting pipe 22 extends to the bottom of the upper screen section 11, i.e. above the packer 13, the underground water rises from the bottom of the upper screen section 11, is degraded by the battery assembly 3, and is discharged from the upper screen hole 111 in the top side wall of the upper screen section 11.

[0041] It should be noted that traditional in-situ groundwater remediation technologies typically require the addition of expensive chemicals, nutrients, and oxygen, or the introduction / addition of specific microbial strains acclimated to the contaminated site. However, in some embodiments of this invention, a battery assembly 3 is installed within the upper sieve section 11. This battery assembly 3 includes an electrode structure with a single-chamber cavity. By introducing air into the single-chamber cavity, the oxygen in the air undergoes a reduction reaction, providing a permanent electron acceptor for the inner wall of the electrode structure. This results in the outer wall of the electrode structure forming the anode and the inner wall forming the cathode. The cathode and anode are directly connected, avoiding internal resistance caused by electrode segmentation, thus improving electron transfer capacity and increasing the degradation rate of organic pollutants.

[0042] The bioelectrochemical remediation of contaminated groundwater requires both electron donors and acceptors. In actual aquifers, the limited availability of electron acceptors restricts the oxidation of organic pollutants. Furthermore, insufficient mixing within the aquifer necessitates the replenishment of electron acceptors only at the physical boundaries of the contaminated plume. The reduction in electron donors / acceptors limits the degradation rate of pollutants, while the difficulty in the diffusion of electron acceptors and donors slows the metabolism and growth of electroactive microorganisms.

[0043] By introducing air into the single-chamber cavity, an oxidation-reduction reaction occurs within the air, causing the inner wall of the electrode structure to form a cathode and the outer wall to form an anode. Electron transfer occurs continuously between the electron acceptor and the electron donor, promoting the metabolism of electroactive microorganisms and their degradation of organic matter.

[0044] In some embodiments of the present invention, multiple sets of battery components 3 may be provided, depending on the specific dimensions of the circulation well. The number of battery components 3 is not a limitation of the present invention.

[0045] Reference Figure 3 and Figure 4 As shown, in some embodiments of the present invention, the electrode structure includes an electrode tube 31 and an electrode disk 32. A first hollow cavity is formed inside the electrode tube 31. The electrode disk 32 is sleeved on the electrode tube 31. A second hollow cavity is formed inside the electrode disk 32. The first hollow cavity and the second hollow cavity are connected to form a single-chamber cavity.

[0046] Specifically, the electrode structure includes an electrode tube 31 and an electrode disk 32 sleeved on the electrode tube 31. The first hollow chamber of the electrode tube 31 and the second hollow chamber of the electrode disk 32 are connected to form a single-chamber air. The electrode disk 32 increases the attachment area of ​​electroactive microorganisms, thereby improving oxidation efficiency and degradation efficiency of organic pollutants.

[0047] It can be understood that the diameter of the electrode disc 32 is smaller than the diameter of the upper screen pipe lumen, so as to facilitate replacement and maintenance.

[0048] It can be understood that the electrode structure can also be a serpentine tubular structure to increase the contact area of the underground water with the electrode structure and increase the attachment area of the electroactive microorganisms.

[0049] In some embodiments of the present application, the electrode tube 31 and the electrode disc 32 are both made of carbon-based materials.

[0050] Specifically, the electrode tube 31 and the electrode disc 32 are both made of carbon nanomaterials.

[0051] In some embodiments of the present application, the electrode disc 32 is in a meshed disc structure, as shown in Figure 6 The electrode disc 32 is provided with a plurality of meshed discs and is sleeved on the electrode tube 31 from top to bottom.

[0052] Specifically, the underground water sucked from the lower screen section 12 is discharged into the upper screen section 11 by the suction pump, the upper screen hole 111 is arranged on the top side wall of the upper screen section 11, the underground water rises from the bottom of the upper screen section 11 to the upper screen hole 111 for discharge, and the electrode disc 32 is arranged in a meshed disc structure. During the rising of the underground water, the underground water passes through the mesh holes of the electrode disc 32, and the electroactive microorganisms in the underground water are attached to the electrode disc 32, so as to biodegrade the organic pollutants in the underground water. The sediment sludge formed after the biodegradation is deposited under the blockage of the mesh holes of the electrode disc 32, so as to avoid the blockage of the upper screen hole 111 by the sediment sludge after the oxidation and degradation. The plurality of electrode discs 32 are sleeved from top to bottom, so as to improve the filtration capacity and effectively avoid the blockage of the upper screen hole 111.

[0053] As shown in Figure 5 In some embodiments of the present application, the electrode tube 31 is arranged in a U-shaped structure, one end of the electrode tube 31 is arranged in the end cover 14 to extend outside the well body 1 and communicate with the gas delivery pump, and the other end of the electrode tube 31 is connected with an aeration structure.

[0054] Specifically, the electrode tube 31 is arranged in a U-shaped structure, and the aeration structure is connected to the other end of the electrode tube 31. The arrangement of the U-shaped structure can realize upward blowing, accelerate the lifting of the water level, and promote the hydraulic circulation. At the same time, the aeration can blow off the soluble volatile organic pollutants, the fluctuation of the underground water can accelerate the resolution of the light non-aqueous phase liquid in the soil aeration zone and the underground water surface, and the oxygen in the air can enter the aquifer around the underground water circulation well with the underground water overflowing from the upper screen section 11, so as to promote the oxidation and biodegradation of the organic pollutants in the soil aeration zone and the aquifer.

[0055] In some embodiments of the present application, the aeration structure comprises an aeration plate 41 provided with a gas collection cavity, the other end of the electrode tube 31 communicates with the gas collection cavity, and the upper end surface of the aeration plate 41 is provided with a plurality of aeration nozzles 42 communicating with the gas collection cavity.

[0056] In some embodiments of the present application, the aeration nozzles 42 are uniformly arranged on the upper end surface of the aeration plate 41, and the aeration nozzles 42 are frustoconical.

[0057] Specifically, by arranging a plurality of aeration nozzles 42, the aeration nozzles 42 are uniformly distributed and frustoconical, which improves the aeration effect, forms a larger airflow pressure, and blows off the soluble volatile organic matter in the groundwater, speeds up the volatilization of the adsorbed organic pollutants in the upper screen section 11, and makes the oxygen enter the aquifer with the groundwater, thereby promoting the in-situ aerobic biodegradation of the organic pollutants in the aquifer.

[0058] In some embodiments of the present application, the upper surface of the packer 13 is fixedly installed with a sludge tray 6, and the sludge tray 6 is located below the battery assembly 3 to accommodate anaerobic sludge.

[0059] Referring to Figure 2 Specifically, the sludge tray 6 is fixedly installed on the upper surface of the packer 13, and is used to accommodate the electroactive microorganism debris and the deposition of organic pollutants falling from the electrode disc 32. The sludge tray 6 forms an anaerobic environment to promote the growth of anaerobic microorganisms, so as to decompose the debris of organic pollutants in the groundwater and realize recycling.

[0060] It can be understood that the battery assembly 3 forms a reactor similar to the upflow anaerobic sludge bed in the upper screen section 11. After the electroactive microorganisms degrade the organic pollutants, an anaerobic sludge bed with good sedimentation is formed in the sludge tray 6. Under the natural stirring of the water pumping and injecting assembly 2 and the aeration assembly 4, a part of the sludge forms a thin sludge suspension zone above the sludge tray 6, and part of the sludge adheres to the surface of the electrode structure. The anaerobic microorganisms in the sludge on the upper end of the packer 13 enter the aquifer with the groundwater, and decompose the organic pollutants in the aquifer. Under the anaerobic environment, the organic pollutants in the circulation well are decomposed to produce gas which rises up, and the release is accelerated under the promotion of the aeration assembly 4.

[0061] It can be understood that the sludge tray 6 is detachably connected between the packer 13, so as to facilitate the extraction and treatment of the sludge, and facilitate the replacement and cleaning of the sludge tray 6 and the up and down movement. In some embodiments of the present application, the sludge tray 6 is made of stainless steel, which has strong corrosion resistance and can delay the service life of the sludge tray 6.

[0062] Referring to Figure 1 and Figure 2As shown, in some embodiments of the present application, the microbial fuel cell circulation well system further comprises a tail gas treatment assembly 5, which comprises a tail gas collection pipe 51, a gas suction pump 52 and a gas separation device 53. The gas suction pump 52 is arranged on the ground, one end of the tail gas collection pipe 51 is arranged through the end cover 14 to extend into the upper screen section 11, the other end of the tail gas collection pipe 51 is in communication with the gas inlet end of the gas suction pump 52, and the gas separation device 53 is in communication with the gas outlet end of the gas suction pump 52.

[0063] Specifically, through the tail gas treatment assembly 5, the large amount of gas generated in the circulation well is collected and separated and treated, the gas that can be reused is collected and utilized, green production is achieved, and environmental pollution is avoided.

[0064] It can be understood that the mixed gas generated in the circulation well is decomposed and treated by the tail gas treatment assembly 5, and after separation, it is collected and recycled as a power fuel.

[0065] In some embodiments of the present application, the gas separation device 53 is adapted to separate and treat the tail gas, and one end of the single-chamber cavity is in communication with the oxygen output end of the gas separation device 53 through a gas conveying pump.

[0066] Specifically, the tail gas in the circulation well is separated by the tail gas treatment assembly 5, and by connecting one end of the electrode structure with the oxygen output end of the tail gas treatment assembly 5, the oxygen is returned to the single-chamber cavity, and the efficiency of the oxidation-reduction reaction is improved.

[0067] Obviously, the above embodiments are only examples for clearly illustrating, and are not intended to limit the implementation. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can also be made. Here, it is not necessary and impossible to enumerate all the implementation. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A microbial fuel cell circulation well system, characterized in that, include: Well body (1), the top of the well body (1) is covered with an end cap (14), the well body (1) is provided with a packer (13), the packer (13) is adapted to divide the well body (1) into an upper screen section (11) and a lower screen section (12), the side wall of the upper screen section (11) is provided with an upper screen hole (111), and the side wall of the lower screen section (12) is provided with a lower screen hole (121). A water injection assembly (2) is provided, with one end of the water injection assembly (2) passing through the packer (13) to extend to communicate with the cavity of the lower screen section (12), and the other end of the water injection assembly (2) communicating with the cavity of the upper screen section (11). The water injection assembly (2) is adapted to realize the water injection circulation between the upper screen section (11) and the lower screen section (12). The battery assembly (3) includes an electrode structure disposed within the upper screen section (11). A sludge tray (6) is fixedly installed on the upper surface of the packer (13). The sludge tray (6) is located below the battery assembly (3) to accommodate anaerobic sludge. The electrode structure includes an electrode tube (31) and an electrode disk (32). A first hollow chamber is formed inside the electrode tube (31). The electrode disk (32) is sleeved on the electrode tube (31). A second hollow chamber is formed inside the electrode disk (32). The first hollow chamber and the second hollow chamber are connected to form a single-chamber cavity. One end of the single-chamber cavity is connected to an air pump to allow air to be introduced and directly contact the electrode structure, so that the outer wall of the electrode structure forms the anode and the inner wall of the electrode structure forms the anode. A cathode is formed, and the cathode and anode are directly connected without the need for wire connection. Electroactive microorganisms in the groundwater attach and grow on the outer peripheral wall of the electrode structure. The electrode disk (32) has a mesh disk structure. Multiple electrode disks (32) are provided and are spaced from top to bottom on the electrode tube (31). The electrode tube (31) is U-shaped. One end of the electrode tube (31) passes through the end cap (14) to extend out of the outside of the well body (1) and communicate with the gas pump. The other end of the electrode tube (31) is connected to an aeration structure. The aeration structure includes an aeration plate (41). The aeration plate (41) is provided with a gas collection chamber. The other end of the electrode tube (31) is connected to the gas collection chamber. The upper surface of the aeration plate (41) is provided with multiple aeration nozzles (42) that communicate with the gas collection chamber.

2. The microbial fuel cell circulation well system according to claim 1, characterized in that, Both the electrode tube (31) and the electrode disk (32) are made of carbon-based materials.

3. The microbial fuel cell circulation well system according to claim 1, characterized in that, The aeration nozzles (42) are uniformly arranged on the upper surface of the aeration plate (41), and the aeration nozzles (42) are frustoconical in shape.

4. The microbial fuel cell circulation well system according to any one of claims 1 to 3, characterized in that, It also includes an exhaust gas treatment assembly (5), which includes an exhaust gas collection pipe (51), an air pump (52) and a gas separation device (53). The air pump (52) is located on the ground. One end of the exhaust gas collection pipe (51) passes through the end cap (14) to extend into the upper screen section (11). The other end of the exhaust gas collection pipe (51) is connected to the air inlet of the air pump (52). The gas separation device (53) is connected to the air outlet of the air pump (52).

5. The microbial fuel cell circulation well system according to claim 4, characterized in that, The gas separation device (53) is adapted to separate and process exhaust gas, and one end of the single-chamber cavity is connected to the oxygen output end of the gas separation device (53) through the gas pump.

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