A flexible anode for a sediment microbial fuel cell and its equipment and application method

Abstract

The present invention belongs to the technical field of sediment microbial fuel cells, and provides a flexible anode of a sediment microbial fuel cell, a fixture thereof, and an application method. The flexible anode of the sediment microbial fuel cell comprises a core material, an inner surface layer, an outer surface layer, and a connecting wire. The fixture of the flexible anode of the sediment microbial fuel cell comprises a frame-type fixture and a scissor-type fixture, wherein the frame-type fixture is suitable for water bodies for small-scale construction, and the scissor-type fixture is suitable for water bodies for large-scale construction. Different fixtures take into account different water depths and regional area conditions, and realize the bottom mud buried installation of the flexible electrode sheet.

Description

Technical Field

[0001] The invention relates to the technical field of sediment microbial fuel cells, and in particular to a flexible anode of a sediment microbial fuel cell, a device thereof and an application method thereof. Background Art

[0002] With the growth of the global population and the acceleration of industrialization, pollution in urban rivers, lakes, estuaries and coasts is becoming increasingly serious. A large amount of organic pollutants are collected in the sediments of rivers and lakes. Traditional treatment methods have problems such as incomplete treatment, high energy consumption, damage to the original ecological environment, secondary pollution, and interference with local microbial populations. In recent years, research on sediment microbial fuel cells (SMFCs) in water sediment pollution control and energy recovery has gradually emerged. It is a bioelectrochemical system that uses microorganisms to decompose organic waste and convert it into electrical energy. It can consume and utilize pollutants and output energy, and has broad application prospects.

[0003] At present, in the research and practice related to SMFC, the SMFC electrode materials mainly include metal materials, carbon materials and composite materials. Among them, flexible materials represented by carbon fiber have good electrical conductivity, flexibility, corrosion resistance and biocompatibility. However, flexible electrodes often have problems such as insufficient strength and lack of support, which makes it difficult to bury them in the bottom mud. The lack of construction methods restricts the promotion and application of SMFC technology. Therefore, how to provide a high-strength electrode material and its corresponding use method has become a problem that technicians in this field need to solve urgently. Summary of the invention

[0004] In view of this, the present invention provides a sediment microbial fuel cell flexible anode and its equipment and application method, which aims to solve the technical problems of the existing flexible electrode having insufficient strength and difficulty in stable operation in the bottom mud.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention provides a sediment microbial fuel cell flexible anode, comprising a connecting wire and n electrode sheets, wherein n≥1, and the electrode sheet comprises a core material, an inner surface layer and an outer surface layer;

[0007] The inner surface layer and the outer surface layer cover both sides of the core material, the connecting wire is inserted between the core material, the inner surface layer and the outer surface layer, and n electrode sheets are connected to form a flexible anode of a sediment microbial fuel cell.

[0008] In the present invention, the material of the core material includes any one of carbon fiber felt, conductive carbon cloth, foamed graphite and carbon fiber sponge;

[0009] The material of the inner surface layer and the outer surface layer independently includes any one of a carbon fiber mesh, a titanium mesh, a stainless steel mesh, a nickel mesh, a nickel-plated mesh and a nylon mesh;

[0010] The material of the connecting wire includes any one of titanium wire, nickel wire, nickel-plated metal wire, nickel alloy cable and stainless steel wire.

[0011] The present invention provides a frame-type fixture for the above-mentioned sediment microbial fuel cell flexible anode, comprising a fixture frame, an electrode sheet guide plate and a triangular sheet;

[0012] The tool frame comprises a pressure frame and an insertion frame, and the pressure frame comprises a pressure rod and a lifting rod.

[0013] Furthermore, the insertion frame is connected to the pressure frame via a triangular piece;

[0014] The insertion frame is perpendicular to the pressing rod and the lifting rod, and is connected to the lifting rod;

[0015] The length of the electrode sheet guide plate is the same as the distance between each frame of the insertion frame, the thickness is smaller than the fixture frame, and the electrode sheet guide plate is located at the bottom end of the fixture frame and connected to the insertion frame.

[0016] Furthermore, the pressure frame and the insertion frame are independently made of punched angle steel, and the electrode sheet guide plate is made of stainless steel.

[0017] The present invention provides an application method of the frame-type harness, comprising the following steps:

[0018] The flexible anode of the sediment microbial fuel cell is fixed under the pressure frame, and downward pressure is applied to the lower pressure rod. The lower pressure rod transmits the pressure to the insertion frame through the connection point, driving the electrode sheet guide plate to push the part of the frame-type equipment below the lower pressure rod into the bottom mud at the bottom of the water body, and an upward pulling force is applied to the lifting rod to lift the insertion frame and the electrode guide plate away from the mud surface. The equipment is pulled out, and the flexible anode of the sediment microbial fuel cell remains in the bottom mud.

[0019] The present invention provides a scissor-type fixture for the above-mentioned sediment microbial fuel cell flexible anode, comprising a support rod, a scissor-type structure and a downward pressing blade;

[0020] The support rod comprises a groove, a sliding notch and a fixed notch;

[0021] The scissor structure comprises a slider, a front connecting rod, a rear connecting rod and a restraining point;

[0022] The pressing blade comprises a blade body, a reinforcing plate, a limiting plate and an electromagnetic clamp.

[0023] Furthermore, the support rods are symmetrically located at both ends of the scissor-type harness, and the fixed notches are connected to the scissor-type structure; the front connecting rod and the back connecting rod in the scissor-type structure are connected to form a scissor-type unit, the two connecting rods in the scissor-type unit point to different directions respectively, the connecting rods in the same direction are parallel, and the center of the intersection of the front connecting rod and the back connecting rod is connected using a constraint point;

[0024] A downward pressure blade is installed on the front connecting rod in the scissors-fork unit, which is perpendicular to the lower surface of the front connecting rod of the scissors-fork unit; reinforcing plates perpendicular to the direction of the blade body are provided at both ends and the middle of the downward pressure blade, and the upper end of the reinforcing plate is connected to the front connecting rod and penetrates the blade body downward; the limit plates are distributed on both sides of the blade body but are not connected to the blade body; electromagnetic clamps are provided at symmetrical positions on both sides of the upper end of the downward pressure blade; the electromagnetic clamps are connected to the reinforcing plates.

[0025] Furthermore, the interiors of the front connecting rod and the back connecting rod are both hollow structures;

[0026] The electromagnetic clamp comprises a fixed end, a movable end, a spring, a power cord, a manual control switch, a main switch, a battery and an insulating gasket; the fixed end is connected and fixed to the reinforcing plate, the movable end is an electromagnet, connected to the fixed end through a spring, when power is on, the movable end attracts and clamps the blade body, when power is off, the spring retracts, the movable end is released, and the electromagnetic clamp resumes relaxation;

[0027] The movable end is connected to a battery inside the hollow structure of the front connecting rod through a power line. The battery controls the switching of the clamping and loosening states of the electromagnetic clamp by controlling whether the electromagnet at the movable end has current.

[0028] The present invention provides an application method of the scissor-type harness, comprising the following steps:

[0029] The flexible anode of the sediment microbial fuel cell is clamped on the downward pressure blade by an electromagnetic clamp, the scissor-fork structure is unfolded, the scissor-fork device is placed on the surface of the underwater mud, the scissor-fork device is pushed into the mud at the bottom of the water body, and the flexible anode of the sediment microbial fuel cell is buried in the mud under the guidance of the downward pressure blade, the electromagnetic clamp is switched to a relaxed state, and the device is pulled out, and the flexible anode of the sediment microbial fuel cell remains in the mud.

[0030] It can be seen from the above technical solution that compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. The flexible anode of the sediment microbial fuel cell provided by the present invention has excellent strength while ensuring high performance, can be easily pressed into the bottom mud, has a long service life and low production cost, and is suitable for different types of construction equipment provided by the present invention.

[0032] 2. The frame-type anode construction tool provided by the present invention is a simple manual installation tool with the advantages of simple structure, low cost and convenient installation. It is suitable for waterless or shallow water, small-scale, and manual construction occasions, such as intertidal coasts, shallow lakes, and river shores, and can adapt to irregular terrain and sediment thickness. When the required layout scale of the project is small, the target construction area is limited, or the construction machinery is difficult to approach and requires manual installation, the frame-type anode construction tool can conveniently complete the burial of the anode.

[0033] 3. The scissor-fork anode construction equipment provided by the present invention is a relatively complex mechanical installation tool. It has the advantages of being foldable and foldable, arbitrarily adjusting the installation density of the electrode sheets, and conveniently completing the synchronous clamping and release of all anode sheets on the equipment. It is applicable to shallow or deep water areas. When the scale required for the project is large and the target construction area is wide and mechanical construction can be used, the scissor-fork anode construction equipment can complete the rapid layout of large-scale construction. The setting of the electromagnetic clamp and the two-stage switch facilitates the retention of the anode electrode sheets in the bottom mud.

[0034] 4. The two construction tools provided by the present invention realize the installation of the flexible electrode sheet buried in the bottom mud, effectively complementing the application scenarios. The flexible anode of the sediment microbial fuel cell used can be universal and can be repeatedly used in construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the electrode sheet in the flexible anode of the sediment microbial fuel cell prepared by the present invention;

[0036] Figure 2 It is a structural front view of the frame-type harness prepared by the present invention;

[0037] Figure 3 It is a left side view of the structure of the frame-type harness prepared by the present invention;

[0038] Figure 4 It is a schematic diagram of the implementation of the frame-type harness prepared by the present invention;

[0039] Figure 5 It is a schematic diagram of the folding of the scissor-type harness prepared by the present invention;

[0040] Figure 6 It is a schematic diagram of the expansion of the scissor-type harness prepared by the present invention;

[0041] Figure 7 It is a schematic diagram of the structure of the downward pressing blade in the scissor-type harness prepared by the present invention;

[0042] Figure 8 It is a schematic diagram of the structure and implementation of the electromagnetic clamp in the scissor-type harness prepared by the present invention;

[0043] Fig. 9 The invention discloses a control circuit diagram of a scissor-type harness prepared by the invention. DETAILED DESCRIPTION

[0044] The present invention provides a flexible anode for a sediment microbial fuel cell, comprising a connecting wire 4 and n electrode sheets, wherein n is greater than or equal to 1, preferably n is greater than or equal to 3, and more preferably n is greater than or equal to 5; the structure of the electrode sheet is as follows: Figure 1 As shown, it includes a core material 1, an inner surface layer 2, and an outer surface layer 3.

[0045] In the present invention, the material of the core material 1 includes any one of carbon fiber felt, conductive carbon cloth, foam graphite and carbon fiber sponge, preferably carbon fiber felt or conductive carbon cloth, and further preferably carbon fiber felt. The carbon fiber felt is soft and loose, and has good water permeability and high porosity to provide conditions for microbial enrichment; the material of the inner surface layer 2 and the outer surface layer 3 independently includes any one of carbon fiber mesh, titanium mesh, stainless steel mesh, nickel mesh, nickel-plated mesh and nylon mesh, preferably any one of carbon fiber mesh, titanium mesh, stainless steel mesh and nickel mesh, and further preferably carbon fiber mesh. The carbon fiber mesh is soft and tough, covering the surface of both sides of the core material 1, and has the functions of protecting the core material 1, constraining and guiding the shape and movement of the core material 1, and collecting and conducting electrons in the anode reaction. Among them, the inner surface layer 2 is the inner folding surface when the flexible anode of the sediment microbial fuel cell is folded and pressed down, and bears the downward pressure of the electrode sheet guide plate 6 to prevent the core material 1 from being cut and damaged by the electrode sheet guide plate; the outer surface layer 3 is the outer folding surface when the flexible anode of the sediment microbial fuel cell is folded and pressed down, and bears the pressure and friction when pressed into the bottom mud to prevent the core material 1 from being damaged when cutting into the bottom mud. The material of the connecting wire 4 includes any one of titanium wire, nickel wire, nickel-plated metal wire, nickel alloy cable and stainless steel wire, preferably titanium wire or nickel wire, and more preferably titanium wire. Titanium wire has good anti-corrosion ability and conductivity, and is interspersed between the inner surface layer 2 and the outer surface layer 3 of the electrode sheet and the core material 1, and connects n electrode sheets to form a flexible anode of the sediment microbial fuel cell, and leads to the surface of the water to form a closed circuit with the cathode wire and the external resistor.

[0046] The present invention provides a frame-type fixture for the above-mentioned sediment microbial fuel cell flexible anode, which is suitable for small-scale construction. Figure 2 to Figure 4As shown, it includes: a fixture frame 5 and an electrode sheet guide plate 6. The fixture frame 5 includes a pressure frame 51 and an insertion frame 52. The materials of the pressure frame 51 and the insertion frame 52 are preferably punched angle steel. Punched angle steel has the advantages of high strength, easy connection, low material and production costs, etc. In addition, the pressure frame 51 includes a lower pressure rod 511 and a lifting rod 512; the insertion frame 52 is perpendicular to the lower pressure rod 511 and the lifting rod 512, and is connected to the lifting rod 512. The insertion frame 52 is connected and fastened to the pressure frame 51 through a triangular piece 7 to provide stability and support. The material of the electrode sheet guide plate 6 is preferably a stainless steel plate, which can increase the strength of the frame-type fixture; as a preference, the electrode sheet guide plate uses a spring steel strip with a length equal to the distance between the frames of the insertion frame 52 and a thickness less than the thickness of the frame steel, which is arranged at the bottom end of the fixture frame 5 and connected to the insertion frame 52.

[0047] The present invention provides an application method of the frame-type harness, comprising the following steps:

[0048] The components of the frame-type fixture are connected and fixed by screws and rivets. The triangular piece 7 is used to connect the vertical frame and provide stability and support; the bolts are used to fix the triangular piece and the angle steel, and provide detachability and adjustability; the rivets are used to fix the bottom of the insertion frame 52 and the two ends of the electrode sheet guide plate 6 to reduce its deformation displacement and transverse cross-sectional area. The flexible electrode is symmetrically bent, wrapped on both sides of the electrode sheet guide plate 6, and connected and led out through the connecting wire 4. When the water depth is shallow or the mud surface is exposed, a manual clamp is used to clamp the electrode sheet and fix it under the pressure frame 51. A weight or manpower is used to apply pressure to the downward pressure rod 511 according to the required size. The downward pressure rod 511 transmits the pressure to the insertion frame 52 through the connection point, driving the electrode sheet guide plate 6 to quickly push the part of the device below the downward pressure rod 511 into the bottom mud at the bottom of the water body. Then the clamp is released, and the lifting rod 512 is held to apply an upward pulling force to lift the insertion frame 52 and the electrode sheet guide plate 6 away from the mud surface. The device is pulled out, and the flexible anode of the sediment microbial fuel cell remains in the bottom mud due to the friction and adhesion of the silt.

[0049] The present invention provides a scissor-type fixture for the above-mentioned sediment microbial fuel cell flexible anode, such as Figures 5 to 9As shown, it includes: a support rod 8, a scissor structure 9, and a downward pressing blade 10. The support rods 8 are two in a group, located at both ends of the equipment and symmetrically, used to support the shape and direction of the scissor structure 9, and are also the force-bearing components for lifting, carrying, pulling, unfolding, pushing and storing during transportation and paving operations. The support rod has a groove 81 inside to store the scissor structure 9 when the equipment is folded. The support rod also has a sliding notch 82 that can constrain the scissor structure 9 while giving the connection point a degree of freedom to slide. The support rod also has a fixed notch 83 that can connect and fix the scissor structure 9; the two ends of the scissor structure 9 have sliders 91.

[0050] In the present invention, the scissor structure 9 is composed of a plurality of scissor units connected, each scissor unit can be uniformly rotated and deformed, changing the shape and area of ​​the scissor structure, so that the construction equipment can be switched between any shapes between the folded state for easy storage and transportation and the maximum stretching length. The scissor unit is composed of a front connecting rod 92 and a back connecting rod 93 connected, the two connecting rods in each scissor unit point to different directions respectively, the connecting rods in the same direction are parallel, and the center of the intersection of each group of front connecting rods 92 and back connecting rods 93 is connected with a constraint point 94, and the constraint point 94 allows the connecting rods to rotate but constrains relative displacement. When the support rod 8 is forced to be pulled outward, the pulling force is transmitted to the first scissor unit through the connection point in the fixed slot 83 and the slider 91 in the sliding slot 82, and then transmitted to the entire scissor structure 9 through the connection of the adjacent constraint points 94, the slider 91 slides in the sliding slot 82, and the scissor structure 9 is deformed and expanded in the pulling direction; when the support rod 8 is forced to move inward, the scissor structure 9 is reversely deformed and folded. The front connecting rod 92 and the back connecting rod 93 are hollow structures inside, so that the equipment can be kept lightweight while allowing circuit layout. A downward pressing blade 10 is installed on the front connecting rod 92 in the scissors-fork unit, which is perpendicular to the lower surface of the front connecting rod 92 of the scissors-fork unit and is a component for fixing and guiding the anode electrode sheet to be buried in the bottom mud. The blade body 101 of the downward pressing blade 10 is shorter than the connecting rod of the scissors-fork unit, and the end close to the front connecting rod 92 is connected in an arc shape with gradually widening to enhance the longitudinal stability of the downward pressing blade 10. During the construction of the equipment, the back side of the scissors-fork unit is pressed downward by force, and the pressure is transmitted to the blade body 101 to drive the electrode sheet to be pressed into the bottom mud. Four reinforcing plates 102 perpendicular to the direction of the blade body 101 are provided at both ends and the middle of the downward pressing blade 10 to increase the strength of the downward pressing blade 10 and prevent the blade body 101 from bending and deforming during the downward pressing process. The upper end of the reinforcing plate 102 is welded and fastened to the front connecting rod 92, and passes through the blade body 101 downward. The length is consistent with the width of the blade body 101, and the downward pressing blade 10 is divided into three equal parts. The downward pressing blade 10 is provided with a horizontal limit plate 103 near the upper end. The limit plates 103 are distributed on both sides of the blade body 101 but are not connected to the blade body 101, leaving a gap, and connecting the four reinforcing plates 102 to limit the downward pressing depth of the fixture. Electromagnetic clamps 104 are symmetrically provided on both sides of the downward pressing blade 10 near the upper end. Each part of the downward pressing blade 10 is provided with two groups of symmetrical electromagnetic clamps 104, which are located above the limit plates 103. The limit plates 103 limit the depth of the fixture pressed into the bottom mud to not exceed the limit plates, so as to prevent the insertion too deep and the mud from accumulating on the clamping structure and affecting the next construction.

[0051] In the present invention, the fixed end 1041 of the electromagnetic clamp 104 is connected and fixed to the reinforcing plate 102, and the movable end 1042 is an electromagnet connected to the fixed end 1041 through four springs 1043. When the power is on, the movable end 1042 attracts and clamps the blade body 101, and when the power is off, the spring 1043 retracts, the movable end 1042 is released, and the electromagnetic clamp 104 resumes relaxation. The movable end 1042 is connected to the control circuit inside the hollow structure of the front connecting rod 92 through the power cord 1044. The control circuit controls the electromagnetic clamp 104 to switch between the clamping and relaxation states by controlling whether the electromagnet in the movable end 1042 has current. Each front connecting rod 92 with a pressing blade 10 is provided with a manual control switch 1045 at one end, which is used to control the opening and closing of the 6 groups of 12 electromagnetic clamps on a pressing blade 10. The whole equipment is provided with a main switch 1046 with a remote control function, which is used to control the opening and closing of the total circuit of all electromagnetic clamps on the equipment. A battery 1047 is placed inside the empty structure in the front connecting rod 92 as a power source for the control circuit. All circuit structures are waterproof. The length of each electrode sheet is limited below the limit plate 103, and a section of insulating gasket 1048 is extended at the position of the electromagnetic clamp 104. The electromagnetic clamp fixes and releases the electrode sheet by clamping the insulating gasket 1048.

[0052] The present invention provides an application method of the scissor-type harness, comprising the following steps:

[0053] After the scissor-type equipment is installed, half-expand and install the electrode sheet. All manual control switches 1045 are turned off, the main switch 1046 is closed, all anode electrode sheets are folded in half, and the extended insulating gasket 1048 is inserted between the movable end 1042 of the electromagnetic clamp 104 and the blade body 101 through the gap between the limit plate 103 and the blade body 101. After each placement of the three anode electrode sheets of a pressing blade 10, the manual control switch 1045 belonging to the pressing blade 10 is closed, so that the electromagnetic clamp 104 clamps the insulating gasket 1048, connects the connecting wires 4 of all anode electrode sheets and reserves the lead-out wires. Fold the construction equipment, transport it to the target construction area, stretch the support rod 8 to unfold the scissor structure, and place it on the surface of the underwater bottom mud. Use a crane or a heavy hammer to press the construction equipment into the bottom mud. Under the guidance of the pressing blade 10, the anode electrode sheet is buried in the bottom mud, and the pressing is stopped when the limit plate 103 contacts the bottom mud surface and the downward pressure resistance increases. According to the conditions, use the remote control or manual control main switch 1046 to relax all the electromagnetic clamps 104, release the clamped insulating gasket 1048, and hang the construction equipment to separate it from the bottom mud. All the electrode sheets are retained in the bottom mud due to friction and adhesion to form a flexible anode of the sediment microbial battery.

[0054] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0055] Example 1

[0056] A sediment microbial fuel cell flexible anode comprises a connecting wire and an electrode sheet, wherein the electrode sheet comprises a core material, an inner surface layer and an outer surface layer;

[0057] The core material is carbon fiber felt, the thickness of the carbon fiber felt is 2mm, the carbon content is 95%, the porosity is 90%, and the volume density is 0.10g / m 2 , the resistivity is 0.028Ω·m;

[0058] The inner and outer surfaces are made of carbon fiber mesh, which is woven from 12k tows with a diameter of 5 μm into a mesh with a pore size of 5 mm. The tensile strength of a single tow along the fiber direction is 3000 MPa, and the resistivity is about 2×10 -4 Ω·m, the resistance of a single bundle of 1m is 87Ω;

[0059] The connecting wire is made of titanium wire with a diameter of 1.5 mm and a resistivity of 4.2×10 -7 Ω·m, the resistance of 1m long titanium wire is about 0.238Ω.

[0060] Example 2

[0061] A sediment microbial fuel cell flexible anode comprises a connecting wire and an electrode sheet, wherein the electrode sheet comprises a core material, an inner surface layer and an outer surface layer;

[0062] The core material is carbon fiber felt, the thickness of the carbon fiber felt is 2mm, the carbon content is 95%, the porosity is 90%, and the volume density is 0.12g / m 2 , the resistivity is 0.028Ω·m;

[0063] The inner and outer surfaces are made of carbon fiber mesh, which is woven from 12k tows with a diameter of 8 μm into a mesh with a pore size of 5 mm. The tensile strength of a single tow along the fiber direction is 3000 MPa, and the resistivity is about 2×10 -4 Ω·m, the resistance of a single bundle of 1m is 88Ω;

[0064] The connecting wire is made of titanium wire with a diameter of 1.5 mm and a resistivity of 4.2×10 -7 Ω·m, the resistance of 1m long titanium wire is 0.240Ω.

[0065] Example 3

[0066] A sediment microbial fuel cell flexible anode comprises a connecting wire and an electrode sheet, wherein the electrode sheet comprises a core material, an inner surface layer and an outer surface layer;

[0067] The core material is carbon fiber sponge, the thickness of the carbon fiber sponge is 2mm, the carbon content is 95%, the porosity is 90%, and the volume density is 0.15g / m 2 , the resistivity is 0.032Ω·m;

[0068] The inner and outer surfaces are made of carbon fiber mesh, which is woven from 12k tows with a diameter of 10 μm into a mesh with a pore size of 5 mm. The tensile strength of a single tow along the fiber direction is 3000 MPa, and the resistivity is about 2×10 -4 Ω·m, the resistance of a single bundle of 1m is 88Ω;

[0069] The connecting wire is made of nickel wire with a diameter of 1.5 mm and a resistivity of 4.2×10 -7 Ω·m, the resistance of 1m long titanium wire is 0.260Ω.

[0070] Performance Testing

[0071] Test method for tear strength of flexible anode of sediment microbial fuel cell: Cut anode sample with a width of 50 mm, clamp the anode sample on the testing machine according to standard requirements, and take the maximum value of the testing machine in tension as the tear strength. The test results are shown in Table 1.

[0072] Table 1 Tear strength test results of flexible anode of sediment microbial fuel cell

[0073] Anode sample Example 1 Example 2 Example 3 Tear strength (kN / m) 1002 998 991

[0074] Test method for shear strength of flexible anode of sediment microbial fuel cell: Cut a square anode sample with a width of 50 mm, fix one side of the sample on the fixture of the testing machine, apply a force perpendicular to the plane of the sample to the sample, and slide the other side on the plane of the sample to perform shearing, and record the maximum shear force before the sample is damaged. The test results are shown in Table 2.

[0075] Table 2 Shear strength test results of the flexible anode of sediment microbial fuel cell

[0076] Anode sample Example 1 Example 2 Example 3 Shear strength(kN / m) 38.39 37.56 35.98

[0077] It can be seen from Table 1 and Table 2 that the flexible anode of the sediment microbial fuel cell prepared in the present invention has excellent mechanical strength and can work stably in the sediment.

[0078] Application Example 1

[0079] At Shapowei, Siming District, Xiamen City, Fujian Province, the frame-type anode construction equipment was used in the SMFC test in the muddy intertidal zone of the dock. The construction was carried out on the exposed mud surface at low tide. When the tide was high, the seawater filled the gap between the mud and the suspended floating cathode, and the device started to operate. Each frame-type equipment of the test contained 4 flexible anodes (0.5m×0.4m) of sediment microbial fuel cells prepared in Example 1 and 3 flexible anodes (0.25m×0.4m) of sediment microbial fuel cells prepared in Example 2, totaling 1.1m 2 , 2 frames are installed per square meter of area, and the test area is 2m 2 , using graphite felt as the cathode, produced 14.25mW / m 2 The power density of the anode material is 328 yuan / m 2 The construction equipment cost is 150 yuan. The implementation of this equipment solves the problem of laying and burying flexible anodes. Under the same paving area, the cost is reduced by about 70% to 80% compared with carbon brush anodes.

[0080] Application Example 2

[0081] In the Babian River in Xiuyu District, Putian City, Fujian Province, the scissor-type anode construction equipment was used in the SMFC sediment remediation test of the urban freshwater river, and the construction was carried out in a water depth of 1 to 1.5 meters. The electrode and the construction equipment were folded and transported to the river bank of the target area. After unfolding, the anode was clamped and installed on the equipment, and then suspended and lowered to the target construction area by a crane and pressure was applied. The paving speed was about 16m 2 / h. Each scissor-type device of the test contains 17 downward pressing blades, each of which contains 3 sediment microbial fuel cell flexible anodes (0.6m×0.4m) prepared in Example 3, totaling 12.24m 2 , every 8m 2 One scissor frame was installed in the test area, and a total of 6 scissor frames were installed in the test area, covering a water area of ​​48m 2 , using graphite felt as the cathode, produced 6.53mW / m 2 The power density is about 10 times that of stainless steel anode.

[0082] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A scissor-type fixture for a flexible anode of a sediment microbial fuel cell, characterized in that: It includes a support rod, a scissor structure and a downward pressure blade; The support rod comprises a groove, a sliding notch and a fixed notch; The scissor structure comprises a slider, a front connecting rod, a rear connecting rod and a restraining point; The pressing blade comprises a blade body, a reinforcing plate, a limiting plate and an electromagnetic clamp; The support rods are symmetrically located at both ends of the scissor-type harness, and the fixed notches are connected to the scissor-type structure; the front connecting rod and the back connecting rod in the scissor-type structure are connected to form a scissor-type unit, the two connecting rods in the scissor-type unit point to different directions respectively, the connecting rods in the same direction are parallel, and the center of the intersection of the front connecting rod and the back connecting rod is connected using a constraint point; A downward pressure blade is installed on the front connecting rod in the scissor fork unit, which is perpendicular to the lower surface of the front connecting rod of the scissor fork unit; reinforcing plates perpendicular to the direction of the blade body are arranged at both ends and the middle of the downward pressure blade, and the upper end of the reinforcing plate is connected to the front connecting rod and penetrates the blade body downward; the limit plates are distributed on both sides of the blade body but are not connected to the blade body; electromagnetic clamps are arranged at symmetrical positions on both sides of the upper end of the downward pressure blade; the electromagnetic clamps are connected to the reinforcing plate; The interiors of the front connecting rod and the back connecting rod are both hollow structures; The electromagnetic clamp comprises a fixed end, a movable end, a spring, a power cord, a manual control switch, a main switch, a battery and an insulating gasket; the fixed end is connected and fixed to the reinforcing plate, the movable end is an electromagnet, connected to the fixed end through a spring, when power is on, the movable end attracts and clamps the blade body, when power is off, the spring retracts, the movable end is released, and the electromagnetic clamp resumes relaxation; The movable end is connected to a battery inside the hollow structure of the front connecting rod through a power line, and the battery controls the electromagnetic clamp to switch between the clamping and loosening states by controlling whether the electromagnet at the movable end has current; The flexible anode of the sediment microbial fuel cell comprises a connecting wire and n electrode sheets, wherein n≥1, and the electrode sheet comprises a core material, an inner surface layer and an outer surface layer; The inner surface layer and the outer surface layer cover both sides of the core material, the connecting wire is inserted between the core material, the inner surface layer and the outer surface layer, and n electrode sheets are connected to form a flexible anode of a sediment microbial fuel cell; The material of the core material includes any one of carbon fiber felt, conductive carbon cloth, foamed graphite and carbon fiber sponge; The material of the inner surface layer and the outer surface layer independently includes any one of a carbon fiber mesh, a titanium mesh, a stainless steel mesh, a nickel-plated mesh and a nylon mesh; The material of the connecting wire includes any one of titanium wire, nickel-plated metal wire, nickel alloy cable and stainless steel wire.

2. The method for applying the scissor-type harness according to claim 1, characterized in that: The following steps are involved: The flexible anode of the sediment microbial fuel cell is clamped on the downward pressure blade by an electromagnetic clamp, the scissor-fork structure is unfolded, the scissor-fork device is placed on the surface of the underwater mud, the scissor-fork device is pushed into the mud at the bottom of the water body, and the flexible anode of the sediment microbial fuel cell is buried in the mud under the guidance of the downward pressure blade, the electromagnetic clamp is switched to a relaxed state, and the device is pulled out, and the flexible anode of the sediment microbial fuel cell remains in the mud.

Images