A microbial fuel cell, system and optimization method for simultaneous nitrification and denitrification

Abstract

The present invention relates to a microbial fuel cell, system, and optimization method for synchronous nitrification and denitrification. The microbial fuel cell for synchronous nitrification and denitrification includes: a reactor body, a microbial fuel cell anode electrode sheet, and a microbial fuel cell cathode electrode sheet. The microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet are both fixed to the interior of the reactor body by nylon bolts. One end of the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet are each rotatably connected to a first knob, and the other end of the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet are each rotatably connected to a second knob. The outer surface of the reactor body is respectively connected to a reaction water inlet pipe and a reaction water outlet pipe, and the position of the reaction water outlet pipe is higher than that of the reaction water inlet pipe. The present application improves denitrification efficiency and reduces energy consumption, while saving space and cost, and reducing resource waste or secondary pollution of resources.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a microbial fuel cell, system and optimization method for simultaneous nitrification and denitrification. Background Art

[0002] With the advancement of science and technology, people have gradually realized the importance of environmental protection. Therefore, the pollution of water environment has attracted much attention, especially the treatment of ammonia nitrogen wastewater. Ammonia nitrogen wastewater mainly comes from fertilizers, industrial and domestic sewage, landfill leachate and pharmaceutical waste liquid, and ammonia nitrogen wastewater can cause serious water environment pollution, which in turn harms the human body and affects production and life.

[0003] Traditional ammonia nitrogen denitrification technology generally adopts the double-chamber electrode membrane denitrification method. However, due to the presence of two layers of electrode membranes in the double-chamber electrode membrane denitrification method, a larger processing space is invisibly occupied, resulting in low denitrification efficiency and energy consumption, which in turn leads to higher processing costs. In addition, the materials after denitrification cannot be reused, thus causing waste of resources or secondary pollution. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a microbial fuel cell, system and optimization method for simultaneous nitrification and denitrification. The technical problem to be solved by this application is to overcome the problems of low efficiency, high energy consumption, large space occupation, waste of resources and secondary pollution of resources existing in traditional ammonia nitrogen technology in the prior art, improve the denitrification efficiency and reduce energy consumption, while saving space and cost, reducing resource waste or secondary pollution of resources.

[0005] To solve the above technical problems, the present invention provides a microbial fuel cell, system, and optimization method for simultaneous nitrification and denitrification. The microbial fuel cell for simultaneous nitrification and denitrification includes: a reactor body, a microbial fuel cell anode electrode sheet, a microbial fuel cell cathode electrode sheet, a reaction water inlet pipe, a reaction water outlet pipe, a first knob, and a second knob. The microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet are both fixed to the reactor body by nylon bolts, and the microbial fuel cell cathode electrode sheet is located above the microbial fuel cell anode electrode sheet. One end of the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet are each rotatably connected to a first knob, and the other end of the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet are each rotatably connected to a second knob. The first knob and the second knob are used to control the rotation of the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet within the reactor body to adjust the electrode distance between the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet.

[0006] The outer surface of the reactor body is respectively connected to the reaction water inlet pipe and the reaction water outlet pipe. The position of the reaction water outlet pipe is higher than that of the reaction water inlet pipe, and the reaction water inlet pipe and the reaction water outlet pipe are not on the same vertical plane. The reaction water inlet pipe and the first knob are on the same vertical plane, and the reaction water outlet pipe and the second knob are on the same vertical plane. The anode electrode sheet and the cathode electrode sheet of the microbial fuel cell are located in the vertical range between the reaction water inlet pipe and the reaction water outlet pipe.

[0007] In one embodiment of the present invention, the simultaneous nitrification and denitrification microbial fuel cell further comprises a peristaltic pump, which is installed on the reaction water inlet pipe.

[0008] In one embodiment of the present invention, the simultaneous nitrification and denitrification microbial fuel cell further comprises an overflow weir, and the overflow weir is fixedly connected to the cathode electrode sheet of the microbial fuel cell.

[0009] An embodiment of the present application also provides a simultaneous nitrification and denitrification microbial fuel cell system, comprising a simultaneous nitrification and denitrification microbial fuel cell, an external electrical device, and a voltage and current data collector, wherein the cathode electrode sheet of the microbial fuel cell in the simultaneous nitrification and denitrification microbial fuel cell is electrically connected to one end of the external electrical device, and the other end of the external electrical device and the anode electrode sheet of the microbial fuel cell in the simultaneous nitrification and denitrification microbial fuel cell are both electrically connected to the voltage and current data collector.

[0010] The present application also provides an optimization method for a microbial fuel cell system with simultaneous nitrification and denitrification. The optimization method for a microbial fuel cell system with simultaneous nitrification and denitrification includes:

[0011] Place the target bacterial suspension into the reactor body;

[0012] The target liquid to be treated is fed into the anode electrode sheet of the microbial fuel cell through the reaction water inlet pipe to undergo nitrification reaction to generate primary reactants;

[0013] The primary reactant is input into the cathode electrode sheet of the microbial fuel cell to carry out a denitrification reaction to generate a target reactant;

[0014] Rotate the first knob and the second knob to adjust the electrode spacing between the anode electrode sheet and the cathode electrode sheet of the microbial fuel cell to determine the target reaction efficiency and target power generation performance of the simultaneous nitrification and denitrification microbial fuel cell at different electrode spacings;

[0015] Based on the target reaction efficiency and target electricity production performance, the optimal electrode spacing is determined to complete the optimization of the simultaneous nitrification and denitrification microbial fuel cell system.

[0016] In one embodiment of the present invention, determining the optimal electrode spacing based on the target reaction efficiency and target power generation performance includes:

[0017] Each target reaction efficiency and each target power generation performance are screened according to a preset priority rule to determine the optimal electrode spacing of the simultaneous nitrification and denitrification microbial fuel cell.

[0018] The above technical solution of the present invention has the following advantages over the prior art:

[0019] The present application provides an embodiment in which a reactor body is combined with a microbial fuel cell anode electrode sheet and a microbial fuel cell cathode electrode sheet to achieve simultaneous nitrification and denitrification reactions in the same chamber, thereby improving denitrification efficiency and reducing energy consumption, saving space and cost while reducing resource waste or secondary pollution of resources.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic structural diagram of a microbial fuel cell system for simultaneous nitrification and denitrification provided in an embodiment of the present application is shown;

[0023] Figure 2 A cross-sectional view of a simultaneous nitrification and denitrification microbial fuel cell system provided in an embodiment of the present application is shown;

[0024] Figure 3 A structural block diagram of an optimization method for a microbial fuel cell system with simultaneous nitrification and denitrification provided in an embodiment of the present application is shown.

[0025] In the picture:

[0026] 100-microbial fuel cell system for simultaneous nitrification and denitrification; 101-microbial fuel cell for simultaneous nitrification and denitrification; 1011-reactor body; 1012-anode electrode sheet for microbial fuel cell; 1013-cathode electrode sheet for microbial fuel cell; 1014-reaction water inlet pipe; 1015-reaction water outlet pipe; 1016-first knob; 1017-second knob; 102-external electrical equipment; 103-voltage and current data collector; 400-optimization device for the microbial fuel cell system for simultaneous nitrification and denitrification. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for which protection is claimed, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work falls within the scope of protection of the present application.

[0028] First, the application scenarios to which this application is applicable are introduced. This application can be applied in the field of waste gas treatment technology.

[0029] Research has found that in the existing technology, traditional ammonia nitrogen denitrification technology generally adopts the denitrification method of double-chamber electrode membrane. Since the double-chamber electrode membrane denitrification method has two layers of electrode membranes, it invisibly occupies a larger processing space, resulting in low denitrification efficiency and energy consumption, which in turn leads to higher processing costs. In addition, the materials after denitrification treatment cannot be reused, thus causing waste of resources or secondary pollution.

[0030] Based on this, the embodiments of the present application provide a microbial fuel cell, system and optimization method for simultaneous nitrification and denitrification, which improves denitrification efficiency and reduces energy consumption, while saving space and cost, and reducing resource waste or secondary pollution of resources.

[0031] See also Figure 1 , Figure 1This is a structural schematic diagram of a simultaneous nitrification and denitrification microbial fuel cell system provided in an embodiment of the present application. The simultaneous nitrification and denitrification microbial fuel cell system 100 includes a simultaneous nitrification and denitrification microbial fuel cell 101, an external electrical device 102, and a voltage and current data collector 103. The microbial fuel cell cathode electrode sheet 1013 in the simultaneous nitrification and denitrification microbial fuel cell 101 is electrically connected to one end of the external electrical device 102, and the other end of the external electrical device 102 and the microbial fuel cell anode electrode sheet 1012 in the simultaneous nitrification and denitrification microbial fuel cell 101 are both electrically connected to the voltage and current data collector 103.

[0032] In the above, the embodiment provided in the present application uses a current data collector to centrifugally measure the ammonia nitrogen, nitrate nitrogen and COD content in the inlet and outlet liquids every 24 hours.

[0033] The microbial fuel cell 101 for simultaneous nitrification and denitrification includes: a reactor body 1011, a microbial fuel cell anode electrode sheet 1012, a microbial fuel cell cathode electrode sheet 1013, a reaction water inlet pipe 1014, a reaction water outlet pipe 1015, a first knob 1016, and a second knob 1017. The microbial fuel cell anode electrode sheet 1012 and the microbial fuel cell cathode electrode sheet 1013 are both fixed to the interior of the reactor body 1011 by nylon bolts, and the microbial fuel cell cathode electrode sheet 1013 is located above the microbial fuel cell anode electrode sheet 1012. One end of the microbial fuel cell anode electrode sheet 1012 and the microbial fuel cell cathode electrode sheet 1013 are each rotatably connected to a first knob 1016, and the other end of the microbial fuel cell anode electrode sheet 1012 and the microbial fuel cell cathode electrode sheet 1013 are each rotatably connected to a second knob 1017.

[0034] Here, the first knob 1016 and the second knob 1017 in the embodiment provided by the present application are used to control the rotation of the microbial fuel cell anode electrode sheet 1012 and the microbial fuel cell cathode electrode sheet 1013 in the reactor body 1011, so as to adjust the electrode spacing between the microbial fuel cell anode electrode sheet 1012 and the microbial fuel cell cathode electrode sheet 1013, and the electrode spacing in the embodiment provided by the present application can be specifically but not limited to 1 cm to 5 cm.

[0035] In the above, the embodiments provided in this application enhance the power generation capacity of the simultaneous nitrification and denitrification microbial fuel cell 101 by adjusting different electrode spacings.

[0036] The electrode material size of the microbial fuel cell anode electrode sheet 1012 and the microbial fuel cell cathode electrode sheet 1013 in the embodiment provided in this application is 40 mm×40 mm×(0.2 mm to 1 mm).

[0037] See also Figure 2 , Figure 2 A cross-sectional view of a simultaneous nitrification and denitrification microbial fuel cell system provided in an embodiment of the present application.

[0038] In this way, the microbial fuel cell anode electrode sheet 1012 is located directly below the biofuel cell cathode electrode sheet.

[0039] The microbial fuel cell 101 for simultaneous nitrification and denitrification includes: a reactor body 1011, a microbial fuel cell anode electrode sheet 1012, a microbial fuel cell cathode electrode sheet 1013, a reaction water inlet pipe 1014, a reaction water outlet pipe 1015, a first knob 1016, and a second knob 1017. The microbial fuel cell anode electrode sheet 1012 and the microbial fuel cell cathode electrode sheet 1013 are both fixed to the interior of the reactor body 1011 by nylon bolts, and the microbial fuel cell cathode electrode sheet 1013 is located above the microbial fuel cell anode electrode sheet 1012. One end of the microbial fuel cell anode electrode sheet 1012 and the microbial fuel cell cathode electrode sheet 1013 are each rotatably connected to a first knob 1016, and the other end of the microbial fuel cell anode electrode sheet 1012 and the microbial fuel cell cathode electrode sheet 1013 are each rotatably connected to a second knob 1017.

[0040] In the above, the embodiment provided by the present application adjusts the electrode distance through the second knob 1017 and the first knob 1016, thereby improving the denitrification and electricity generation performance of the microbial fuel cell 101 for simultaneous nitrification and denitrification.

[0041] Here, the effective volume of the reactor body 1011 in the embodiment provided in this application is 200 mL to 500 mL, and the ratio of the inner diameter to the height of the reactor body 1011 is 1:1.4.

[0042] Furthermore, the simultaneous nitrification and denitrification microbial fuel cell 101 further includes a peristaltic pump, which is installed on the reaction water inlet pipe 1014 .

[0043] Here, in the embodiment provided in this application, the rotation speed of the peristaltic pump can be specifically 0.1 rpm / min.

[0044] Furthermore, the simultaneous nitrification and denitrification microbial fuel cell 101 further includes an overflow weir, which is fixedly connected to the cathode electrode sheet 1013 of the microbial fuel cell.

[0045] Here, the thickness of the overflow weir in the embodiment provided in this application is 4 mm.

[0046] The microbial fuel cell system 100 for simultaneous nitrification and denitrification in the embodiment provided in the present application, compared with the prior art, combines the reactor body 1011 with the microbial fuel cell anode electrode sheet 1012 and the microbial fuel cell cathode electrode sheet 1013 to achieve simultaneous nitrification and denitrification reactions in the same chamber, thereby improving denitrification efficiency and reducing energy consumption, saving space and cost while reducing resource waste or secondary pollution of resources.

[0047] The simultaneous nitrification and denitrification microbial fuel cell system 100 provided in the embodiment of the present application, compared with the prior art, realizes simultaneous nitrification and denitrification reaction and cathode aerobic denitrification by combining the simultaneous nitrification and denitrification microbial fuel cell 101 with the simultaneous nitrification and denitrification reaction technology (SND) to achieve denitrification technology. The denitrification process uses NH4+-N as an electron donor and NO3--N, NO2--N and oxygen as electron acceptors, thereby enhancing the denitrification performance and the generation of electrical energy.

[0048] See also Figure 3 , Figure 3 For the embodiments of this application, Figure 3 As shown, the optimization method of the simultaneous nitrification and denitrification microbial fuel cell system includes the following steps:

[0049] S301. Place the target bacterial suspension into the reactor body.

[0050] S302: The target liquid to be treated is fed into the anode electrode sheet of the microbial fuel cell through the reaction water inlet pipe to undergo nitrification reaction to generate primary reactants.

[0051] S303: Input the primary reactant into the cathode electrode sheet of the microbial fuel cell to undergo a denitrification reaction to generate a target reactant.

[0052] In this step, the target liquid bacterial suspension to be treated is successively input into the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet of the simultaneous nitrification and denitrification microbial fuel cell to carry out simultaneous nitrification and denitrification reaction, and the target reaction efficiency and target power generation performance of the simultaneous nitrification and denitrification microbial fuel cell under the candidate electrode spacing type are determined.

[0053] S304, rotating the first knob and the second knob to adjust the electrode spacing between the anode electrode sheet and the cathode electrode sheet of the microbial fuel cell to determine the target reaction efficiency and target power generation performance of the simultaneous nitrification and denitrification microbial fuel cell at different electrode spacings.

[0054] In this step, the operator manually rotates the first knob and the second knob to adjust the electrode spacing between the anode electrode sheet and the cathode electrode sheet of the microbial fuel cell, and determines different target reaction efficiencies and target power generation performances corresponding to the cell spacings at different electrode spacings.

[0055] The target power generation performance includes a target power generation voltage and a target power generation current.

[0056] Here, the embodiment provided in the present application first inoculates the bacterial suspension into the reactor body, and then introduces the target liquid from the reaction water inlet pipe into the reactor body for inoculation with the bacterial suspension, and the inoculation ratio of the bacterial suspension to the target liquid (including but not limited to contaminated wastewater) is 1:9, and then in the corresponding candidate electrode spacing type, by rotating the first knob and the second knob to adjust the angle of the microbial fuel cell cathode electrode sheet and the angle of the microbial fuel cell anode electrode sheet, respectively, so that the spacing between the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode meets the above-mentioned candidate electrode spacing type, and then the target liquid bacterial suspension first flows into the microbial fuel cell anode electrode sheet for nitrification reaction, and then flows into the microbial fuel cell anode electrode sheet for denitrification reaction, and continuously observes the target reaction efficiency and target power production performance of the simultaneous nitrification and denitrification microbial fuel cell under the candidate electrode spacing type during the reaction process.

[0057] In this step, the different electrode spacings in the embodiments provided in this application are used to characterize multiple electrode spacings between the anode electrode sheet and the cathode electrode sheet of the microbial fuel cell. It is assumed that the different candidate electrode spacing types in the embodiments provided in this application are an electrode spacing of 1 cm, an electrode spacing of 2 cm, an electrode spacing of 3 cm, and an electrode spacing of 4 cm.

[0058] S305 , based on the target reaction efficiency and target electricity production performance, determining the optimal electrode spacing to optimize the simultaneous nitrification and denitrification microbial fuel cell system.

[0059] In this step, the embodiment provided in this application determines the optimal electrode spacing of the simultaneous nitrification and denitrification microbial fuel cell by screening various target reaction efficiencies and various target power generation performances according to preset priority rules.

[0060] Here, assuming that the preset priority rule in the embodiment provided in this application is a rule from large to small, the electrode spacing at which the target reaction efficiency and target power production performance are optimal is determined as the optimal electrode spacing, and then the simultaneous nitrification and denitrification microbial fuel cell system is optimized based on the optimal electrode spacing.

[0061] Among them, the embodiments provided in this application adjust the electrode spacing, and the cathode electrode sheet of the microbial fuel cell can be completely in contact with the air to form an air cathode, and the air cathode can use oxygen as an electron acceptor; it can also be immersed in the target liquid bacterial suspension to form an air biocathode. In the embodiments provided in this application, the bacterial species in the target liquid bacterial suspension are consistent with the material of the anode electrode sheet of the microbial fuel cell.

[0062] The optimization method of the simultaneous nitrification and denitrification microbial fuel cell system in the embodiment provided by the present application, compared with the prior art, the target liquid bacterial suspension to be treated, each candidate electrode spacing type, and the simultaneous nitrification and denitrification microbial fuel cell provided by the embodiment provided by the present application determine the target reaction efficiency and target power generation performance of the simultaneous nitrification and denitrification microbial fuel cell under each candidate electrode spacing type, and determine the optimal electrode spacing type of the simultaneous nitrification and denitrification microbial fuel cell based on each target reaction efficiency and each target power generation performance, thereby achieving simultaneous nitrification and denitrification reactions in the same chamber, thereby improving denitrification efficiency and reducing energy consumption, saving space and cost while reducing resource waste or secondary pollution of resources, and controlling the power generation efficiency of the simultaneous nitrification and denitrification microbial fuel cell by adjusting the electrode spacing to obtain maximum battery power.

[0063] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-mentioned embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A microbial fuel cell for simultaneous nitrification and denitrification, characterized by: The synchronous nitrification and denitrification microbial fuel cell includes: a reactor body, a microbial fuel cell anode electrode sheet, a microbial fuel cell cathode electrode sheet, a reaction water inlet pipe, a reaction water outlet pipe, a first knob and a second knob. The microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet are both fixed to the inside of the reactor body by nylon bolts, and the microbial fuel cell cathode electrode sheet is located above the microbial fuel cell anode electrode sheet. One end of the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet are each rotatably connected to a first knob, and the other end of the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet are each rotatably connected to a second knob. The first knob and the second knob are used to control the rotation of the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet in the reactor body, so as to adjust the electrode distance between the microbial fuel cell anode electrode sheet and the microbial fuel cell cathode electrode sheet. The outer surface of the reactor body is respectively connected to the reaction water inlet pipe and the reaction water outlet pipe. The position of the reaction water outlet pipe is higher than that of the reaction water inlet pipe, and the reaction water inlet pipe and the reaction water outlet pipe are not on the same vertical plane. The reaction water inlet pipe and the first knob are on the same vertical plane, and the reaction water outlet pipe and the second knob are on the same vertical plane. The anode electrode sheet and the cathode electrode sheet of the microbial fuel cell are located in the vertical range between the reaction water inlet pipe and the reaction water outlet pipe.

2. The microbial fuel cell for simultaneous nitrification and denitrification according to claim 1, characterized in that: The simultaneous nitrification and denitrification microbial fuel cell further comprises a peristaltic pump, which is installed on the reaction water inlet pipe.

3. The microbial fuel cell for simultaneous nitrification and denitrification according to claim 1, characterized in that: The simultaneous nitrification and denitrification microbial fuel cell further comprises an overflow weir, which is fixedly connected to the cathode electrode sheet of the microbial fuel cell.

4. A microbial fuel cell system for simultaneous nitrification and denitrification, characterized by: The method comprises the microbial fuel cell for simultaneous nitrification and denitrification according to any one of claims 1 to 3, an external electrical device, and a voltage and current data collector, wherein the cathode electrode sheet of the microbial fuel cell in the microbial fuel cell for simultaneous nitrification and denitrification is electrically connected to one end of the external electrical device, and the other end of the external electrical device and the anode electrode sheet of the microbial fuel cell in the microbial fuel cell for simultaneous nitrification and denitrification are both electrically connected to the voltage and current data collector.

5. A method for optimizing a simultaneous nitrification and denitrification microbial fuel cell system, applied to the simultaneous nitrification and denitrification microbial fuel cell system of claim 4, characterized in that: The simultaneous nitrification and denitrification microbial fuel cell optimization method comprises: Place the target bacterial suspension into the reactor body; The target liquid to be treated is fed into the anode electrode sheet of the microbial fuel cell through the reaction water inlet pipe to undergo nitrification reaction to generate primary reactants; The primary reactant is input into the cathode electrode sheet of the microbial fuel cell to carry out a denitrification reaction to generate a target reactant; Rotate the first knob and the second knob to adjust the electrode spacing between the anode electrode sheet and the cathode electrode sheet of the microbial fuel cell to determine the target reaction efficiency and target power generation performance of the simultaneous nitrification and denitrification microbial fuel cell at different electrode spacings; Based on the target reaction efficiency and target electricity production performance, the optimal electrode spacing is determined to complete the optimization of the simultaneous nitrification and denitrification microbial fuel cell system.

6. The method for optimizing the simultaneous nitrification and denitrification microbial fuel cell system according to claim 5, characterized in that: The determining of the optimal electrode spacing based on the target reaction efficiency and the target power generation performance includes: Each target reaction efficiency and each target power generation performance are screened according to a preset priority rule to determine the optimal electrode spacing of the simultaneous nitrification and denitrification microbial fuel cell.

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